The present invention includes an injection stretch blow molding machine for producing a hollow molded body in the molding cycle consisting of three steps, which is configured on a single molding machine, a method of manufacturing a hollow molded body by the injection stretch blow molding machine is there.
BACKGROUND
[0002]
(Injection stretch blow molding machine)
　injection stretch blow molding machine in the production of the hollow molded body made of a synthetic resin container shapes are conventionally used. 6 and the 7 and 8 show an example of a conventional injection stretch blow molding machine. The injection stretch blow molding machine 1, stretch blow molding and injection molding unit 2 the injection device a is connected to the molten resin is fed, the preforms injection molded in the injection molding unit 2 as a hollow molded article container shape a blow molding unit 3, and a three stations with take-out portion 4 for unloading the hollow molded body is blow-molded by stretch blow molding unit 3 to outside the device.
[0003]
(Rotating plate)
　in the injection stretch blow molding machine 1, and arranged for each equiangularly three stations a position on the same circumference, on top of the three stations, preform and blow molding the molded and a rotating plate 5 for conveying in a manner that pivoting movement of the body inside the intermediate base 6.
[0004]
(Lip-type)
　the rotating plate 5 of the injection stretch blow molding machine 1 forms an outer circumferential surface of the preform opening and the mouth portion of the molded preform conveying the container shape of the preform at mouth obtain form those having a lip-type 7 of the outer peripheral surface forming and preform conveying the preform opening for the conveyance of the molded hollow molded body to the lower surface.
[0005]
(Constant angular rotation of the rotating plate)
　in an injection stretch blow molding machine 1, as shown in Patent Document 1 and Figure 9, the injection molding unit 2 in the rotational center axis of the rotating plate 5, stretch blow molding unit 3 provided extraction portion 4 is in every equal angle (120 degrees). Rotation plate portion 8 formed by assembling a control device and a drive motor to the intermediate base 6 has support the rotating plate 5, under the control of the rotation plate portion 8, the rotating plate 5 is constant rotation angle (120 degrees) stop each rotation, also rotating plate in a state of stopping the rotation is such that the rising and falling together with the rotating plate 8.
[0006]
(Injection molding unit)
　Then, each time the rotating plate 5 is lowered, the lower surface of the lip type 7 of the rotary plate 5, the injection molding unit 2, the stretch blow molding unit 3, correspond to a take-out portion 4, injection molding section in 2, the injection mold 9 is formed by the mold and the lip mold 7 is arranged in the injection molding unit 2 by the lip die 7 descends. Further, the stretch blow molding unit 3, so that stretch blow mold is formed by the mold lip mold 7 is arranged in stretch blow molding unit 3 by drop and lip mold 7.
[0007]
　In FIG. 6, in order to facilitate an understanding of such structure of the injection stretch blow molding machine 1, the cavity mold and core mold of the injection mold 9 is not shown. In FIG. 7, the injection mold 9 is represented the state in which the mold opening in the injection molding unit 2, the core mold 11 is raised to the upper base 10, the cavity mold 13 to lower base 12 side is positioned.
[0008]
　With lip mold 7 forms the shape of the outer peripheral surface of the preform opening as part of the injection mold 9, stretch blow molding section holds preform in a state of soft and injection molded by high temperature transported to the 3.
[0009]
(Stretch blow molding section)
　in stretch blow molding unit 3, as with split mold is composed of a blow mold clamping unit 14, as shown in FIG. 6, the upper stretch blow molding unit 3 intermediate the foundation 6, stretching unit 15 for stretching the preform and is assembled, the lip-type 7 to stretch blow molding unit 3 is as blow mold 16 is formed by corresponding.
[0010]
　Stretch blow molding unit 3 is located at the downstream side in the rotating plate rotating direction with respect to the injection molding unit 2, a molding step follows with respect to the injection molding unit 2. By lip mold 7 to the stretch blow molding unit 3 corresponding preform is positioned in a blow mold, as shown in FIG. 10, the blowing operation and blow air c of the stretching unit 15, the container from the preform hollow molded body is blow molded into the shape.
[0011]
　Hollow molded bodies blown remains held by the lip mold 7, the lip mold 7 conveys the hollow molded body to the take-out portion 4 of the next stage. Then, by the lip die 7 corresponds to the take-out portion 4, so that the hollow molded body is located in the take-out portion 4.
[0012]
(Extraction unit)
　In the extraction unit 4, the slope (not shown) to the lower base 12 side is disposed. Then, so that a hollow molded product is released from the lip type corresponding to the take-out portion 4 is sent to the device outside the injection stretch blow molding machine 1 is guided by the slope. Figure 8 is shown in a state viewed injection stretch blow molding machine 1 from the take-out portion 4 side, the drawing, the blow mold clamping unit 14 of the stretch blow molding unit 3 on the rear side is positioned.
[0013]
　Further, the take-out portion 4 in the upper side of the slope, a mechanism for projecting the hollow molding body towards the slope is configured. In the position corresponding to the take-out portion 4 as shown in FIGS. 6 and 8 have been taken out unit 17 disposed on the intermediate base 6 side to push the hollow molded body located in take-out portion 4 by a lip mold 7 a plurality of rods 18, and drop and rise in guiding the take-out unit 17 is to be performed.
[0014]
　On the other hand, the lip type 7 disposed in the rotating plate 5, there is the half of the pairs are combined as shown in FIG. 11, those which are capable split. Then, the rod 18 is provided so as lip mold 7 is opened immediately before contact with the example mouth portion of the hollow molded body was lowered, the rod 18 into the hollow molded body is released from the holding of the lip mold 7 is brought contact with, so as hollow molded body is protruded to the slope side, it has become one hollow molded body is sent out to the device outside the slope.
[0015]
　Lip mold 7 when the rod 18 returns to the standby position raised are provided to be closed again. Then, the lip mold 7 is moved into the injection molding unit 2 by the rotation of the rotating plate 5. Incidentally, when the lip mold 7 is moved to the stretch blow molding unit 3 from the injection molding unit 2, also when moving the pickup unit 4 from stretch blow molding unit 3, when moving further from the take-out portion 4 to the injection molding unit 2, rotating plate 5 is to lift together with the rotating plate 8 (intermediate base 6).
[0016]
(Molding cycle)
　in a conventional injection stretch blow molding machine, an injection molding process, a blow molding process, provided with a molding cycle and eject process proceeds in the order, the hollow molded body by passing through the molding cycle is produced that. (Each step is a molding machine operation.)
[0017]
(Injection molding step)
　First, in the injection molding process, the lip-type 7 as described above in response to the injection molding unit 2, the resin from the injection device relative the injection mold 9, which is constituted by the injection molding unit 2 is fed, preform is injection molded in the injection mold 9.
[0018]
(Blow molding step)
　blow molding process, a lip mold 2 corresponding to the stretch blow molding unit 3 is carried out by blow molding mold 16 composed of a stretch blow molding unit 3. Specifically, the preform lip mold 7 for holding the preforms soft at high temperature as injection molding, corresponds to move to the stretch blow molding unit 3, the corresponding lip-type injection molding unit 2 There is disposed in the blow mold 16 in the stretching blow molding unit 3. Then, the preform while stretching in the rod of the stretching unit 15, performs the blowing blow air c preform. This hollow molded body of the container shape is blow molded.
[0019]
(Ejection step)
　In the subsequent blow molding process ejection process, lip mold 7 for holding the hollow molded body is blow molded as described above, it corresponds to move the take-out portion 4 takes out part of the lip mold 7 wherein the response to 4 hollow molded body is placed in extraction section 4. The lip mold 7 releases the holding for the mouth of the hollow profile open. Furthermore the guided to the take-out unit 17 rod 18 descending from above is brought into contact with the mouth of the hollow molded body was removed from the lip mold 7 by the hollow molded body is protruded by the rod 18, to the slope It is to be sent out.
[0020]
　In the injection stretch blow molding machine for producing a hollow molded body in the molding cycle to proceed the steps in sequence, steps proceed in the molding cycle, one-step displacement relative to the step progress in the next molding cycle of the molding cycle It has progressed Te, hollow molding body in each molding cycle is to be produced. (See Figure 12)
CITATION
Patent Document
[0021]
Patent Document 1: JP 2017-109472 JP
Summary of the Invention
Problems that the Invention is to Solve
[0022]
　12, the progress of the three steps of when the injection stretch blow molding machine is operating is shown schematically. Molding cycle as described above, an injection molding process, blow molding process, since the ejection process proceeds in the order, in this FIG. 12, the order of steps in the one process proceeds laterally in the molding cycle (X-axis direction) It has been described with. That is, the injection molding step A, the blow molding step B, are described in that order ejection step C. Note that a portion indicated by a reference sign r in Figure 12, increase in the rotational plate and the rotation of the rotating plate (120 degrees) and drop of the rotating plate indicates the steps carried out.
[0023]
　Further, in the injection stretch blow molding machine, the molding cycle proceeds shifted by one step with respect to step progress in the next molding cycle of the molding cycle. That is, the process proceeds in molding cycle against process proceeds for the next molding cycle, is provided so as to lead in one step fraction. In the longitudinal direction (Y-axis direction) in FIG. 12, three of the molding cycle (1), (2), are shown in preorder to (3). Then, the process proceeds in the preceding molding cycle, the state in which proceed in one step fraction are shown for the next molding cycle.
[0024]
　Also shows three molding cycles for ease of description, FIG. 12. Of course, in the operation of the injection stretch blow molding machine, it is also performed to continue the fourth and subsequent molding cycle.
[0025]
　Furthermore, the injection stretch blow molding machine, there is a a stretch blow molding portion and the take-out portion injection molded part at 120 ° angular intervals to the lower base, as shown in FIG. Further, the one rotating plate, a plurality of lip mold at angular intervals of 120 degrees so as to correspond to an injection molding unit and the stretch blow molding portion and the take-out portion are arranged separately. And said rotating plate that drops stopped every rotation of a predetermined rotation angle (120 degrees), a state in which the lip type stretch blow molding portion and the take-out portion respectively the injection molding unit is located. If step is terminated in the injection molding unit and the stretch blow molding portion and the take-out portion, the rotating plate is increased again, the rotation of 120 degrees toward the downstream side in the rotating plate rotating direction.
[0026]
　When thus are lowered one rotating plate, the injection molded part an injection molding step is carried out, the blow molding is carried out in the stretch blow molding section, since the ejection step is carried out by extraction portion, injection molding in any of the process and the blow molding step and ejection steps, time rotating plate itself is stopped by drop the same.
[0027]
(Stretching operation in the blow molding section)
　in the stretch blow molding of the conventional injection stretch blow molding machine, the rod of the stretching units may enter the interior of the preform, and performs the drawing by depressing the bottom portion of the preform, flop inside the preform, blow molding by blowing blow air that has been set to a predetermined temperature.
[0028]
(Swelling step (tertiary blow))
　Then, in the above blow molding in the blow molding step B, there is a holding step e and contiguous swelling step d in the puffing step d as shown in FIG. 12. Puffing step d is not referred to as tertiary blow, inflated preform into a three-dimensional directions in the mold of the blow mold by blowing blow air c, swollen preform in contact with the mold surface of the blow mold, the flop the hollow molded body preform has the shape change is step formed in the container shape. Incidentally, it showed swelling step of changing the shape of the preform in Figure 13.
[0029]
(Holding phase (cooling blow))
　is the holding step e have been referred to as the cooling blow, following the puffed step d to continue blowing the blowing air c, is a stage that holds the hollow molded body by blow molding mold . Then, in the holding step e, the container shape is performed blowing blow air c the hollow molded body has cooled, to complete the solidification of the container shape holding step e until solidified. A retention stage in FIG.
[0030]
　Since this completes the solidification of the hollow molded body holding step e in is conveyed to the unit is taken out from the stretch blow molding unit, even if such falls onto the slope at the take-out portion, the hollow molded body collapse and dents is so as not to cause to.
[0031]
　The stretch blow molding portion, so as to cool the hollow molded body to a temperature at which the container shape by performing blowing of blowing air as described above is solidified. Then, that to complete the immobilization of the container shape of the hollow molded body main condition defines a time rotary body must be stopped drops blow molding process.
[0032]
(Operation of the injection molding unit)
　On the other hand, in the injection molding unit in the injection stretch blow molding machine, the resin in the injection mold from a connected injection apparatus in a hot runner portion (runners leading to the cavity mold of an injection molding unit) injection. The preform can be properly release, and are subjected to cooling to stabilize the preform shape which is not deformed when transported to the stretch blow molding section is downstream of the rotary plate rotation. Then, the cooling of the preform by injection with an injection mold resin into the injection mold as main operations carried out by the injection molding process. At reference numeral f in FIG. 12, showing the injection cooling stage of the preforms.
[0033]
(Operation in the extraction unit)
　in the take-out section, open the lip mold holding a mouth portion of the hollow molded body as described above, and the operation to drop to the slope side a hollow molded body rod extraction unit . The opening of the lip mold during ejection step, pushed down by the rod of the hollow profile, are subjected to closed lip mold.
[0034]
(Failure events)
　, however, the when using a conventional injection stretch blow molding machine for producing a hollow molded body,
the time required until completing the immobilization of the container shape in-stretch blow molding section,
Injection molding and the time the resin is spread into the mold and the total time of the time required for cooling of the preform (excluding the time for injection operation of the injection device) in part,
the actual operation of the opening and closing rod lifting of the lip mold in and retrieval unit time and
comparing Trip time required to complete the immobilization of the container shape in a stretch blow molding section, have become the most longer. The time of the actual operation according to the opening and closing rod lifting of the lip mold at the take-out portion is short.
[0035]
　Either the injection molding step and the blow molding step and ejection steps of the molding cycle, as described above, the time the rotating plate itself is stopped by drop is the same. Then the stretching time required for the blow molding step in the blow molding section is made longest, therefore, during the molding cycle time and allocated to the injection molding process, the time and allocated to the blow molding process, allocated to eject step time and that are both there is a problem that becomes the same as the time allocated to the longest blow molding process.
[0036]
　For example, the operations of the injection unit of each device of the injection molding unit in the injection molding process must be adjusted to match the time defined by the blow molding process. In particular, a preform is in soft state even the preform shape is stable, in order to move smoothly in the mold of a blow mold of a stretch blow molded part from the injection molding unit, the injection unit side shots before It must be adjusted to increase the operation.
[0037]
　More recently, it devised that can early release the preform from the injection mold, to shorten the operation time in the injection molding section, whereby it has become an attempt to shorten the molding cycle is performed .
[0038]
　However, the time allocated to the injection molding process, to become the same as the time required by the blow molding process, even when attempted to preform can release early in the injection molding unit, the pre-shot operation of the injection apparatus it is necessary to adjust to long. Therefore, it is not possible to make use of the advantages to be able to early release the preform.
[0039]
　The present inventors, in the take-out portion is configured on the downstream side of the rotary plate rotation direction with respect to stretch blow molding section, with time of the actual operation according to the vertical movement of the lip mold opening and closing and the rod is short, its focusing the operation timing of the lifting of the lip-type opening and the rod, without affecting the operation of the equipment in operation and stretch blow molding unit of the apparatus of the injection molding unit, the point to be set to in ejection step did.
[0040]
　The present invention has been made in view of the above circumstances, the immobilization of the container shape of the hollow molded body, without completed during the blow molding process, so as to be completed during the ejection step of the extraction unit, the operation of a stretching blow molding section and aims to shorten the time by shortening the time required for the blow molding process in the molding cycle, it is an object to improve the production efficiency of the hollow profile.
Means for Solving the Problems
[0041]
(Claim 1 of the invention)
　The present invention has been made in consideration of the above problems, the rotation of the constant rotational angle have a lip-shaped outer peripheral surface forming and preform conveying the preform opening on the lower surface below the rotary plate for lifting stopped every, an injection molding unit and the stretch blow molding portion and the take-out portion is provided in the rotational center axis of the rotary plate, the rotary plate by rotation of the constant rotational angle wherein a injection stretch blow molding machine lip mold corresponding to and the taking-out portion stretch blow molding portion and the injection-molded part, each but to drop
the preform by injection molding section the lip type corresponding is injection molded an injection molding process,
the lip mold holding the preform soft at high temperature, which is injection molded in an injection molding unit, corresponds to move to the stretch blow molding section, corresponding to the stretch blow molding portion of the lip type the pre-by Omu is arranged in stretch blow molding section, a blow molding process is blow-molded hollow product by blowing blow air into the preform in the shape of the container,
holding the hollow molded body is blow molded by the stretch blow molding section lip type that is compatible to move the take-out portion, the said by corresponding to the lip-shaped extraction part hollow molded body is disposed in extraction section, the hollow from the lip mold open lip type corresponding to extraction unit and ejection step of the molded body leaves
has a molding cycle which proceeds in the order,
step progress in the molding cycle, and proceeds off by one step with respect to step progress in the next molding cycle of the molding cycle, in the injection stretch blow molding machine for producing a hollow molded body for each molding cycle,
Inside the hollow molded body wherein are arranged extraction portion mouth is held by the lip mold, during the blow molding process in the next molding cycle, it has made it possible blowing cooling air cooler and,
the cooling device, the inside of the hollow molded body disposed in the take-out portion is blown with cooling air during the blow molding process in the next molding cycle, the hollow molded body disposed in the take-out portion providing injection stretch blow molding machine, characterized by having a structure in which cooling to complete the immobilization of the container shape, it is intended to solve the above problems.
[0042]
(Invention of claim 2)
　Then, in the above invention, the blow molding of the stretch blow molding unit comprises a swelling forming a hollow molded body of the container shape by inflating the said preform by blowing blow air, this swelling stage Subsequently be those and a holding step of holding the hollow molded body,
wherein the stretch blow molding section, in the holding step of blow molding, before the cooling to the hollow molded body in the cooling device it is good that is intended for cooling the hollow molded body as a process.
[0043]
(Invention of claim 3)
　In the above invention, the take-out portion is provided with a projecting mechanism,
the projecting mechanism is in the vertical direction corresponding to the mouth of the hollow molded body disposed in the take-out unit has a movable and rods, the movement range of the lower end of the rod, of the hollow profile through the positions of the opening portion of the hollow molded body from above the hollow molded body disposed in the take-out unit If you are in the range of up to how the lower end of the rod is temporarily stopped the descent of the rod when reaches the position of the opening portion of the hollow molded body from above the hollow profile, during descent of the once after stop rod releasing the holding of the mouth portion of the hollow profile according lipped open lip mold, which eject the hollow molded body held by the lip mold is released downwards,
the rod of the ejector mechanism, the said rod opening balloon at the lower end By positioning have cooling air passes through passage is provided in the cooling device,
the cooling device until the pause descent of the rod at the latest, the cooling air to the inside of the hollow molded body from the outlet it is good that is intended to blow.
[0044]
(Invention of claim 4)
　Further, another invention, the lift stops per revolution of the constant rotational angle have a lip-shaped outer peripheral surface forming and preform conveying the preform opening on the lower surface below the rotating plate that, an injection molding unit and the stretch blow molding portion and the take-out portion is provided in the rotational center axis of said rotating plate, said each time the rotating plate by the rotation of the constant rotational angle drops lip mold corresponds to the stretch blow molding portion and the take-out portion and the injection-molded part, the injection molding unit the injection mold in the mold and the lip mold provided in the injection molding unit is formed, at a stretching blow molding section a injection stretch blow molding machine blow mold is formed by the mold and the lip mold provided in the stretch blow molding unit,
the injection preform is injection molded by an injection molding unit which lip type corresponding a molding step,
the injection molding Lip mold holding the preform soft at high temperature injection molded in parts is correspondingly moved to the stretch blow molding section, the preform is stretch blow molded by corresponding to the stretch blow molding portion of the lip type arranged section, the blow molding step to be blow molded, blow molded by blowing blow air into the preform in the shape of the container
lip mold for holding the hollow molded body is blow molded by the stretch blow molding section, corresponds to move the take-out portion, the hollow molded body by corresponding to the take-out portion of the lip type disposed in extraction section, the hollow molded body is disengaged from the lip mold open lip type corresponding to extraction unit and eject step
has a molding cycle progresses sequentially,
In the method step progress in the molding cycle, to produce a hollow molded article by injection stretch blow molding machine which travels shifted by one step with respect to step progress in the next molding cycle of the molding cycle, the injection stretch blow molding machine section has the mouth portion is disposed to the take-out portion is possible blowing cooling air to the inside of the hollow molded body held by the lip mold cooling device,
by the cooling device, extraction unit inside the placement hollow molded article, by blowing cooling air into the blow molding process in the next molding cycle, to solidify the container shape of the hollow molded body by cooling the hollow molded body a method for producing a hollow molded body, wherein is intended to solve the above problems and provide a method for producing the hollow molded body.
[0045]
(According the invention of claim 5)
　In Then the invention, the blow molding step includes a swelling forming a hollow molded body of the container shape inflating the preform in the mold of the blow mold by blowing of blowing air, the Following puffed stage have a holding step of holding the hollow molded body in a blow mold,
in the molding cycle, over the ejection step in the molding cycle from the holding stage in the blow molding process and solidifying period for the solid is provided a container shape in the hollow profile Te,
in the holding phase at the solidification period, blow molding and blowing blow air into the hollow molded body held by the blow mold body was cooled, and at the ejection step in the solidification period, medium and blowing cooling air of the cooling device in the hollow molded body arranged on the take-out unit The molded body is cooled, it is good to complete the solidification of the hollow molded body in the solidification period.
The invention's effect
[0046]
(Claim 1 of the effect of the invention)
　According to the present invention, an injection stretch blow molding machine, the inside of the hollow molded body disposed in the take-out unit, during the blow molding process in the next molding cycle, have a cooling device capable blowing cooling air, the cooling device, the inside of the hollow molded body, the cooling air is blown during blow molding step in the next molding cycle, the hollow molded body since complete immobilization of the container shape by cooling, it is possible to reduce the operation time in the stretch blow molding section.
[0047]
　Then, when the operation time in the stretch blow molding section is shortened, the time allocated to the blow molding process in the molding cycle is shortened. The time allocated to the time and ejection step of allocating the injection molding process of the molding cycle in the injection stretch blow molding machine are the same as the time allocated to the blow molding process, there is an effect that it is possible to shorten the molding cycle .
[0048]
　Furthermore, it is possible to the blow air for stretch blow molding unit cooling apparatus and a cooling air different from an effect that a high degree of freedom when setting the temperature and pressure of the cooling air fed from the cooling device .
[0049]
(Claim effect of the invention 2)
　According to the invention of claim 2, stretch blow molding section, the holding stage in blow molding, prior to cooling to complete the immobilized for hollow molded article in the cooling device as the processing, since it is assumed to cool the hollow molded body, during the molding cycle, an effect that the time for performing the immobilization of container shapes made more easily ensured.
[0050]
(Effect of the invention of claim 3)
　According to the invention of claim 3, the rod of the ejector mechanism, a passage through which cooling air passes through the cooling apparatus is provided, balloon is the end of the cooling air flow passage in the passage mouth, have is positioned at the lower end of the rod, the cooling device, at the latest until the pause descent of the rod, and is intended to blow cooling air to the inside of the hollow molded body from the outlet. Therefore, the rod of the ejector mechanism is comprised that also functions of the pipe for guiding the cooling air of the cooling device in the hollow molded body, it is not necessary to attach the pipe for cooling air around the rod.
[0051]
(Claim effect of the invention 4)
　According to the invention of claim 4, the cooling device for an injection stretch blow molding machine, the inside of the hollow molded body, blowing cooled air during the blow molding process in the next molding cycle in, so to complete the immobilization of the container shape by cooling the hollow molded body, it is possible to reduce the operation time in the stretch blow molding section.
[0052]
　Then, when the operation time in the stretch blow molding section is shortened, the time allocated to the blow molding process in the molding cycle is shortened. The time allocated to the time and ejection step of allocating the injection molding process of the molding cycle for producing the hollow molded body is the same as the time allocated to the blow molding process, there is an effect that it is possible to shorten the molding cycle.
[0053]
(Claim effect of the invention 5)
　According to the invention of claim 5, the molding cycle, thereby a solid container shape in the hollow molding body over the ejection step in the molding cycle from a holding stage in the blow molding process solid period is provided. Then, in the holding phase at the solidification period, a hollow molded body was cooled by blowing blow air into the hollow molded body held by the blow mold, and in ejection process in solidification period, the take-out unit the hollow molded body is cooled by the blowing arrangement cooling air of the cooling device in the hollow molded body, it is assumed to complete the solidification of the hollow molded body in the solidification period.
[0054]
　Thus in both the in ejection process of the holding phase and extraction portion during the blow molding process in the blow molding section, the hollow molded body was cooled, and to complete the solidification, during the molding cycle, the shape of the container fixed an effect that more be even easier to secure the time for performing reduction.
BRIEF DESCRIPTION OF THE DRAWINGS
[0055]
Is an explanatory view showing an embodiment of an injection stretch blow molding machine according to FIG. 1 the present invention.
FIG. 2 is an explanatory diagram showing an example of the take-out section in an embodiment.
3 is an explanatory view showing a lip type in the embodiment.
Is an explanatory view showing a molding cycle to proceed shifted by one step in FIG. 4 the present invention.
FIG. 5 is an explanatory view showing a comparison between step progression of the molding cycle in the conventional method for manufacturing a step progress and the invention of the molding cycle in the manufacturing process.
6 is an explanatory diagram showing an example of a conventional injection stretch blow molding machine.
7 is an explanatory view showing a state as viewed from the injection-molded part side of an example of an injection stretch blow molding machine.
8 is an explanatory view showing a state seen an example from the take-out side of the injection stretch blow molding machine.
9 is an explanatory view schematically showing a layout of an injection molding unit and the stretch blow molding portion and the take-out portion.
[Figure 10] Blow molding is an explanatory view schematically showing.
11 is an explanatory view showing a lip type.
Is an explanatory view showing a step progress of each molding cycle in FIG. 12 conventional injection stretch blow molding machine.
FIG. 13 is an explanatory view schematically showing the swelling stage in blow molding.
FIG. 14 is an explanatory view schematically showing the holding phase in the blow molding.
DESCRIPTION OF THE INVENTION
[0056]
　It will be described in detail with reference now to the present invention from Figure 1 in the embodiment shown in FIG. The portion of the conventional example and configured to overlap omitted referred by the same reference numerals.
[0057]
(Injection stretch blow molding machine)
　injection stretch blow molding machine 1 of the present invention, like the conventional injection stretch blow molding machine as shown in FIG. 6, the rotation of the lift stop for each rotation of 120 degrees rotation angle below the plate 5, and a take-out portion 4 and the injection molding unit 2 and the stretch blow molding unit 3 is provided in the rotational center axis of the rotating plate 5. And the take-out portion 4 injection molding unit 2 and the stretch blow molding unit 3, the lower base 12, are disposed in the rotation center axis of the rotary plate 5 for each 120 degrees.
[0058]
　The rotating plate 5, like the conventional injection stretch blow molding machine, and a lip mold 7 of the outer peripheral surface forming and preform conveying the preform opening on the lower surface. The lip mold 7 are arranged separately so that each rotation angle of 120 degrees rotation about the central axis of the rotating plate 5. (See Figure 2)
[0059]
　The lip mold 7 each time the rotating plate 5 is lowered by the rotation of 120 degrees corresponds to the take-out portion 4 and the injection molding unit 2 and the stretch blow molding unit 3. Then, the injection molding unit 2, the injection mold 9 in the mold and the lip mold 7 provided in the injection molding unit 2 is formed, a mold provided in the stretch blow molding unit 3, the stretch blow molding unit 3 those that are to blow mold 16 is formed by the lip mold 7 and. In the take-out portion 4, to release the mouth portion of the hollow profile open lip type 7 corresponding to the take-out portion 4, that pushed down by the rod takes place, the hollow molded body may fall in a slope equipment It is to be sent out to the outside.
[0060]
　Also, injection stretch blow molding machine 1 as in the conventional injection stretch blow molding machine, an injection molding step A and the blow molding step B and ejection step C is provided with a molding cycle which proceeds in the order, going through the molding cycle in hollow molded body is manufactured. Further, the process proceeds in the molding cycle, also the same as the conventional example that travels shifted by one step with respect to step progress in the next molding cycle of the molding cycle.
[0061]
(Extraction unit)
　in take-out portion 4 of the injection stretch blow molding machine 1 of the present invention, the hollow molded body disposed in the take-out portion 4 is conveyed from the stretch blow molding unit 3 on the upstream side of the rotary plate rotation direction, It devised for cooling using a cooling air is applied.
[0062]
　Figure 2 has been shown to protrude mechanism 19 that is configured so as to become the upper side of the slope of the take-out portion 4. First, the projecting mechanism 19 unit 17 takes out the intermediate base 6 is assembled. Further, projecting mechanism 19 includes a base plate 20 supporting to its rod 18 is drooping upper end of the rod 18 for protruding you plural is connected. Then, by taking out unit 17 is moved up and down to guide the base plate 20, the rod 18 is movable up and down.
[0063]
　As the rod 18 itself is in the description of the conventional injection stretch blow molding machine, able to pass the inside of the mouth of the hollow molded body b which the lip mold 7 and the lip type 7 corresponding to the take-out portion 4 is held possible way, correspond located above the hollow molded body b is located in take-out portion 4. The lower end of the rod 18 by the rod 18 is lowered corresponds located inside the mouth portion of the lip mold 7 and the hollow molded body b. Further, by a predetermined amount of drop in the rod 18 is performed, the contact member 21 which is mounted around the outer periphery of the lower end of the rod 18 as shown, abuts the mouth portion of the hollow molded body b, the hollow molded body b the acts which projects downward.
[0064]
　To move the base plate 20 up and down, the cylinder device 22 is installed in the take-out unit 17. Wherein and shaft 23 to the cylinder device 22 is provided to be forward and backward, the shaft 23 is connected to the base plate 20. And together with the rod 18 moves up and down under the action of the cylinder device 22, the lower end of the rod 18 is provided so as to stop temporarily at a set height position will be described later.
[0065]
(Opening of the lip-type)
　More each side edge of the base plate 20, the lip-type opening plate 24 for opening the lip mold 7 is attached. A motion projecting hollow molded body b this point of opening the lip mold 7 in the lip mold opening plates 24 and the rod 18 is lowered are associated as follows.
[0066]
　Moving range of the lower end of the rod 18 is in the range up to the inside of the hollow molded body by passing through the position of the mouth of the hollow profile b from above the hollow profile b of the take-out portion 4. In Figure 2, the rod 18 is shown the state in the standby position in the left half. It shows a state in which the lower end is stopped once in a position corresponding to the mouth of the hollow molded body b of the rod 18 to the right half.
[0067]
　First, the shaft 23 by the operation of the cylinder device 22 is stretched downward, the base plate 20, a rod 18 the lower end in the upper position of the hollow molded body b is oriented in the hollow molded body b drops. The lower end of the rod 18 through the lip mold 7, further at the time of the drop to the height position of the mouth portion of the hollow molded body b, lowering of the rod 18 is once provided to stop. Once the lower end of the rod 18 in a stopped state is positioned to face toward the inside of the hollow molded body b. (Right half see Figure 2)
[0068]
　Base plate 20 is, when in the high position when the rod 18 is stopped once, the base plate lip mold opening plates 24 attached to 20 pairs, each incorporating half of the lip type 7 does not reach the position of the lip plate 25, the lip-type 7 is closed in. (See Figure 3)
[0069]
　By the base plate 20 and the rod 18 has stopped lowering temporarily drops again, the lower end of the lip-type open plate 24 abuts on the abutting portion of the lip plate 25 of the pair, between the lip plate 25 of the pair opens as become. If opened between pairs of lip plates 25, half of the lip mold 7 move away from each other, so that the lip type 7 is opened. The mouth of the hollow molded body b holding is released by the opening of the lip type 7.
[0070]
　Further, when the rod 18 is lowered by the drop of the base plate 20, projecting the hollow molded body b under the abutting member 21 abuts the mouth portion of the hollow molded body b. This hollow molded body b is disengaged from the lip type 7.
[0071]
　If the hollow molded body b is disengaged, the movement to raise the rod 18 is performed. When the base plate 20 is raised, the lip-type open plate 24, together with the leaves from which a pair of the lip plate 25 upwardly open, lower end of the rod 18 so as to escape upward from a portion of the lip mold 7 rod 18 upward moved, it returns to the position to wait.
[0072]
　The lip plate 25, provided with a biasing means (not shown) which half of the lip mold 7 is urged butted always when the lip mold opening plate 24 away from the lip plate 25 moves upward pair of lip plates 25 becomes the closing between the lip type 7 in a state where half were each other butt is formed, whereby the lip type 7 is to return to the closed state.
[0073]
(Cooling device)
　as shown in FIG. 2, the cooling device 26 is connected via a tubing to the base plate 20. And through the interior from the connection portion of the base plate 20 of the tube material rod 18 reaches each of which passages 28 to reach the outlet 27 is opened at the lower end of the rod 18 is provided further through the interior of the rod 18 . The passage 28 is a flow path that cooling air flows fed from the cooling device 26, ends of the channel are outlet 27 above.
[0074]
　Cooling apparatus 26, the hollow molded body b is cooled by feeding cooling air to the inside of the hollow molded body b disposed in extraction section 4, this cooling, to complete the immobilization of the container shape of the hollow molded body b it is intended to way.
[0075]
　Is disposed in the hollow molded body b is take-out portion 4 which has moved from the stretch blow molding unit 3, as described above, and the rod 18 is lowered in the projecting mechanism 19, the mouth of the lower end hollow molded body b of the rod 18 It enters the inside of the section, the lower end of the rod 18 is once stopped at the level of the mouth of the hollow molded body b. When the descent of the rod 18 is stopped once, the cooling device 26 performs the feeding of the cooling air.
[0076]
　When the cooling device 26 performs the feeding of cooling air, the outlet 27 is positioned to face toward the inside of the hollow molded body b. The cooling air from the outlet 27 is fed into the inside of the hollow molded body b, to complete the solidification of the container shape by performing cooling of the hollow molded body b. Cooling air is fed into the hollow molded body b, through a gap formed between the mouth portion and the abutting member 21 of the hollow molded body b, and is discharged to the outside of the hollow molded body.
[0077]
　Then, before the rod 18 is lowered again, the cooling device 26 stops the feed of cooling air. After infeed stop of the cooling air, and an open lip type 7 described above (release of holding against the mouth portion of the hollow molded body), and is carried out against protrusion of the hollow molded body b by member 21 (withdrawal of the hollow molded body) It is.
[0078]
　Cooling air is for cooling the immobilization of the container shape to complete the temperature enters the interior of the hollow molded body b. Then, the hollow molded body b located in the take-out portion 4 a stretch blow molding unit 3, the cooling device 26, until once stopped state of the drop rod 18 is terminated at the latest, from the outlet 27 the cooling air it is intended to blow. However, steps to begin delivery of the cooling air need not be the time of descent is stopped once the rod 18 as described above. When the rod 18 has a corresponding position above the hollow molded body b, it is also possible to feed the cooling air.
[0079]
　Cooling air is not limited as long as cooled to a temperature to complete the immobilization of the container shape enters the inside of the hollow molded body b as described above. Pressure temperature and blowing is not particularly limited.
[0080]
　As the pressure of the temperature and blowing, for example, a temperature of -30 ° C., or a 1 MPa (mega pascal) the pressure applied to the blowing, the temperature was 30 ° C., also the pressure to 2.2MPa possible it is.
[0081]
(Production method, the blow molding step)
　a plurality of molding cycles in injection stretch blow molding machine 1 is in progress. The blowing operation of the take-out portion 4 by the cooling being blown cooling air device 26 in the eject process of the molding cycle are those that are carried out during the blow molding process in the next molding cycle following the molding cycle. In this respect the present invention is important.
[0082]
　Molding cycle of an injection stretch blow molding machine 1 of the present invention, an injection molding step A and the blow molding step B and ejection step C proceeds in the order as shown in FIG. The step progress of the molding cycle proceeds shifted by one step with respect to step progress in the next molding cycle of the molding cycle. The hollow molded body is manufactured for each molding cycle.
[0083]
　To blow molding step in the molding cycle for producing the hollow molded body b of the present invention, blow molding, blown to blow air in stretch blow molding unit 3, flexible preform at a high temperature has shape change in shape of the container and puffing step 29, following the puffed out to continue blowing the blow air, there is a holding stage 30 that holds the hollow molded body in a blow mold. By this swelling stage 29 and holding stage 30, the blow molding in the blow molding step is constructed.
[0084]
　That blow molding is constituted by the holding stage 30 and puffing step 29 is the same as that of the conventional example. However, a method for producing a hollow molded body in a conventional injection stretch blow molding machine has been described above to complete the solidification of the container shape holding phase. That is, in blow molding, to complete the solidification of the container shape of the hollow molded body. Therefore, (the long time required for holding phase) which are time becomes longer required for blow molding.
[0085]
　On the other hand, in the method of the present invention, not to complete the solidification of the container shape in the holding stage 30. In other words, it does not reach to the completion of solidification of the container shape, and a hollow molded body b solidification incomplete state container shape is stable, so that molded in a blow mold. The hollow molded body b solidification incomplete state through the blow molding process B is conveyed to the take-out portion 4, so that moves to eject step C in the take-out portion 4.
[0086]
(Solid period)
　in the molding cycle in the method of the present invention, the hollow molding body over the ejection step C in the molding cycle from the holding stage 30 in the blow molding process in B as shown in FIG. 4 there are solid period 31 for solid container shape.
[0087]
　End of the solidification period 31 is the time at which blowing is finished cooling air of the cooling device 26. If the end of the blowing of the cooling air is when the pause state of the rod 18 is completed, the end of the solidification period 31 is the end of the temporarily stopped state of the rod 18. In reference numeral 32 in FIG. 4, the cooling air cooling apparatus 26 is operated showed a cooling air blowing step blown.
[0088]
　In solid period 31 during the ejection step C, and the cooling air from the cooling device 26 as described above is blown into the inside of the hollow molded body b. Then, to complete the solidification of the container shape of the hollow molded body b with solid period 31 in the eject step C performed in take-out portion 4.
[0089]
　In the present invention, as described above, the holding stage 30 in the solidification period 31 (in the blow molding step B), a hollow molded body was cooled by blowing blow air into the hollow molded body held by the blow mold , so that a hollow molded article b solidification incomplete state is obtained. Furthermore, in the ejection step C in solid period 31, the hollow molded body is cooled by blowing cooling air of the hollow molded body b in the cooling device 26 of the take-out portion 4 to complete the solidification of the container shape.
[0090]
　In the present invention, in a blow molding using a blow mold, since the possible the holding stage 30 not to complete the solidification of the container shape of the hollow molded body, the time required for the blow molding is shortened. Also, the ejection step C, so forcibly blown by solidification of the container shape cooling air to cool to completion, it is easy to set such that the cooling time is not prolonged. Conversely, even within the time allocated to the ejection step C, and a range that does not affect the operation of the injection molding unit and stretch blow molding unit, it is possible to ensure a long cooling time.
[0091]
　It is possible to shorten the time required for blow molding, by shortening the time allocated against stretch blowing process B during the molding cycle, the time allocated to the injection molding step A and ejection step C is shortened (molding cycle the injection molding step a and the blow molding step B and ejection step C, the time required is the same for) at. Therefore, it is possible to shorten the molding cycle, it is possible to improve the efficiency of manufacturing a hollow molded body.
[0092]
　In the above embodiment, the holding stage 30 in the blow molding is stretch blow molding unit 3 performs is described as the cooling is blown is the blow air is performed, the cooling by blowing blow air in the holding stage 30 it is possible to blow molding is not performed. The hollow molded body shape change in shape of the container is cooled by contact with the blow mold, blow molded solidification incomplete state may be be blow molded.
[0093]
　Figure 5 is a state in which the advance of the molding cycle in the manufacturing method arranged vertically relative schematically in the advance and the present invention the molding cycle in the conventional manufacturing method is shown. As shown in FIG. 5, since the molding cycle in the production method of the present invention shortening is performed, production efficiency of the hollow molded body is improved as compared with the prior art.
DESCRIPTION OF SYMBOLS
[0094]
　1 ... injection stretch blow molding machine
　2 ... injection molding unit
　3 ... stretch blow molding unit
　4 ... extraction unit
　5 ... rotary plate
　7 ... lip mold
　17 ... extraction unit
　18 ... rod
　19 ... projecting mechanism
　20 ... base plate
　21 ... contact member
　24 ... lip mold opening plates
　26 ... cooling device
　27 ... outlet
　28 ... passage
　29 ... swelling stage
　30 ... holding stage
　31 ... solid period
　A ... injection molding process
　B ... blow molding process
　C ... ejecting step
　b ... hollow profile

WE claims

[Requested item 1]
Below the rotary plate for lifting the preform mouth portion outer peripheral surface forming and preform lip mold for conveyance of stops per revolution of the constant rotational angle have a lower surface, the rotation center axis of the rotating plate in the injection molding unit and the stretch blow molding portion and the take-out portion is provided, and the constant rotation the lip type injection molding unit stretch blow molding section each time the angular rotation was in the rotating plate is lowered and the extraction portion a injection stretch blow molding machine corresponding to,
　an injection molding process the preform is injection molded by an injection molding unit which lip type corresponding,
　soft preform at a high temperature injection molded in the injection molding section lip mold for holding the correspond go to stretch blow molding section, the preform by corresponding to the stretch blow molding portion of the lip type disposed in stretch blow molding section blow to the preform A blow molding process is a blow molded hollow molded body is a container shape by blowing A,
　lip mold for holding the hollow molded body is blow molded by the stretch blow molding section corresponds to move the take-out portion, the said hollow molded body by corresponding to the lip-shaped extraction parts are arranged in the take-out portion, and the eject process of the hollow molded body is disengaged from the lip mold open lip type corresponding to the take-out portion
molding cycle progresses sequentially has,
　step progress in the molding cycle, and proceeds off by one step with respect to step progress in the next molding cycle of the molding cycle, injection stretch blow molding for producing a hollow molded body per molding cycle in machine,
　the inside of the hollow molded body, wherein disposed extraction portion mouth is held by the lip mold, blow molding Engineering in the next molding cycle During, it has made it possible blowing cooling air cooling apparatus,
　The cooling device is on the inside of the deployed hollow molded body taking-out unit, by blowing cooling air into the blow molding process in the next molding cycle, to cool the hollow molded body disposed in the take-out portion injection stretch blow molding machine, characterized by having a structure to complete the immobilization of the container shape.
[Requested item 2]
　Blow molding of the stretch blow molding unit comprises a swelling forming a hollow molded body of the container shape by inflating the said preform by blowing blow air, and a holding step of holding the hollow molded body Following this swelling stage It is those provided with,
　the stretch blow molding section, in the holding step of blow molding, and is intended to cool the hollow molded body as a pretreatment for the cooling to the hollow molded body in the cooling device injection stretch blow molding machine according to claim 1.
[Requested item 3]
　The extraction unit is provided with a projecting mechanism,
　said protrusion mechanism comprises a rod which is movable in the vertical direction corresponding to the mouth of arranged hollow molded body taking-out portion, of the rod the movement range of the lower end, and has a range of up to inside of the hollow molded body by passing through the position of the opening portion of the hollow molded body from above the hollow molded body disposed in the take-out portion, the lower end of the rod is hollow when reaching from above the molded body to a position of the opening portion of the hollow molded body temporarily stops the descent of the rod to the mouth of the hollow moldings of the lip mold open lip type drop when this once after stop rod releasing the section of the holding, which eject the hollow molded body held by the lip mold is released downwards,
　the rod of the ejector mechanism, and positions the mouth balloon at the lower end of the rod cooling of the cooling device through which air passes through Have is provided,
　the cooling device until the pause descent of the rod at the latest, to claim 1 or 2 which is intended to blow cooling air to the inside of the hollow molded body from the outlet injection stretch blow molding machine according.
[Requested item 4]
　Below the rotary plate for lifting the preform mouth portion outer peripheral surface forming and preform lip mold for conveyance of stops per revolution of the constant rotational angle have a lower surface, the rotation center axis of the rotating plate in the injection molding unit and the stretch blow molding portion and the take-out portion is provided, and the constant rotation the lip type injection molding unit stretch blow molding section each time the angular rotation was in the rotating plate is lowered and the extraction portion corresponds to, in the injection molding unit the injection mold in the mold and the lip mold provided in the injection molding part is formed, the mold and the lip mold provided in the stretch blow molding unit in stretch blow molding section in a injection stretch blow molding machine blow molds are formed,
　the injection molding process the preform is injection molded by an injection molding unit which lip mold is correspondingly
　high temperature injection molded in the injection molding section in the soft preform Lip mold for holding the beam is correspondingly moved to the stretch blow molding section, the preform by corresponding to the stretch blow molding portion of the lip type disposed in stretch blow molding section, blowing blow air into the preform hollow molded body in the shape of the container and blow molding steps being blow molded, by
　the lip mold for holding the hollow molded body is blow molded at a stretching blow molding section corresponds to move the take-out portion, the lip-type is the arrangement on the hollow molded body taking-out section by corresponding to the take-out portion, and the eject process of the hollow molded body is disengaged from the lip mold is opened lipped corresponding to the take-out portion
has a molding cycle which proceeds in the order ,
　injection stretch blanking the process proceeds in the molding cycle proceeds shifted by one step with respect to step progress in the next molding cycle of the molding cycle A method for producing a hollow molded body over molding machine,
　The injection stretch blow molding machine has a cooling device capable blowing cooling air to the inside of the hollow molded body in which the disposed extraction portion mouth is held by the lip mold,
　said cooling device Accordingly, the inside of the hollow molded body disposed in the take-out portion is blown with cooling air during the blow molding process in the next molding cycle, solid container shape of the hollow molded body by cooling the hollow molded body method for producing a hollow molded body, characterized in that the reduction.
[Requested item 5]
　Said blow molding step includes a swelling forming a hollow molded body of the container shape inflating the preform in the mold of the blow mold by blowing of blow air, the blow molding in a blow mold Following this swelling stage have a holding step of holding the body
　to the molding cycle, solidified to the solid container shape in the hollow molding body over the ejection step in the molding cycle from the holding stage in the blow molding process period is provided,
　the at the holding stage in solidification period, a hollow molded body was cooled by blowing blow air into the hollow molded body held by the blow mold, and said at solid period in eject process, the hollow molded body is cooled by blowing cooling air of the cooling device in the hollow molded body arranged in the extraction unit, the hollow formed in the solid period Method for producing a hollow molded article according to claim 4 to complete the solidification of the body.