Claims:We Claim:

1. A quenching unit for removing curl from multilayer polymeric film (2) having asymmetric structure comprising:

a water quenching tank (11) filled with water having controlled temperature and a water evaporation unit (12) located downstream to the water quenching tank (11);

Characterized in that, a plurality of submerged guide rollers (R1, R2, R3, P1, P2, and P3) being submerged into the water filled into the water quenching tank (11);

said water evaporation unit (12) include a transport roller (121) located downstream to the water quenching tank (11), an air blowing pipe (122) having an air jet for blowing high velocity air located downstream to the transport roller (121) , a diamond bar compensator (123) located downstream to the air blowing pipe (122), a rubber wiper compensator (124) located downstream to the diamond bar compensator (123), a nip rollers assembly (125) located downstream to the rubber wiper compensator (124), an air suction pipe (126) located downstream to the nip rollers assembly, a pre-winding aluminum roller (13) located downstream to the air suction pipe (126) and a plurality of pre-winding air suction pipes (131) located downstream to the pre-winding aluminum roller (13).
2. The quenching unit for removing curl from multilayer polymeric film (2) having asymmetric structure as claimed in claim 1, wherein said polymeric film having asymmetric structure of polyethylene and nylon.

3. The quenching unit for removing curl from multilayer polymeric film (2) having asymmetric structure as claimed in claim 1, wherein said diamond bar compensator (123) having a couple of diamond shaped SS bar (123a, 123b) being parallelly located to define longitudinal space therebetween to allow the multilayer polymeric film (2) to slide therethrough.

4. The quenching unit for removing curl from multilayer polymeric film (2) having asymmetric structure as claimed in claim 1, wherein said rubber wiper compensator (124) a couple of diamond shaped SS bar (124a, 124b) being parallelly located to define longitudinal space therebetween to allow the multilayer polymeric film (2) to slide therethrough.

5. The quenching unit for removing curl from multilayer polymeric film (2) having asymmetric structure as claimed in claim 3, wherein each said bar (124a, 124b) is provided with a neoprene rubber wiper (124c).

6. The quenching unit for removing curl from multilayer polymeric film (2) having asymmetric structure as claimed in claim 1, wherein said nip rollers assembly (125) having a driven steel roller (125a) and a rubber roller (125b).
7. The quenching unit for removing curl from multilayer polymeric film (2) having asymmetric structure as claimed in claim 5, wherein nip rollers assembly (125) having a pneumatic cylinder that is mechanically connected to at least one said rollers (125a, 125b).

8. The quenching unit for removing curl from multilayer polymeric film (2) having asymmetric structure as claimed in claim 5, where in the temperature of the water filled into the water quenching tank (11) is in the range of 200 C to 850 C.

9. A process for removing curl from the multilayer polymeric film (2) having asymmetric structure following steps:

a. drawing an extruded, hot web of multilayer polymeric film (2) from an extruder;
b. passing the continuous hot web of the multilayer polymeric film (2) from the water quenching tank (11) though the submerged roller;
c. passing the multilayer polymeric film (2) from the air blowing pipe (122) through the transport roller (121);
d. blowing the air through the air blowing pipes (122) onto the surface of the multilayer polymeric film (2) for throwing the water droplets from the surface of the multilayer polymeric film (2);
e. passing the multilayer polymeric film (2) from the diamond bar compensator (123) and the rubber wiper compensator (124) respectively to wipe out the remaining water particles from the surface of the multilayer polymeric film (2);
f. passing the multilayer polymeric film (2) between the steel roller (125a) and the rubber roller (125b) for performing squeezing action to remove 98% to 99% moisture from the surface of the multilayer polymeric film (2);
g. passing the multilayer polymeric film (2) through the air suction pipe (126) to shuck the moisture from the surface of the multilayer polymeric film (2);
h. passing the multilayer polymeric film (2) from the pre-winding air suction pipe (131) to shuck the moisture from the surface of the multilayer polymeric film (2);
i. achieving 100% moisture free multilayer polymeric film (2);
j. winding the multilayer polymeric film (2) onto the roll.

Dated this on 28th day of August, 2019
, Description:FORM 2
THE PATENT ACT 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. TITLE OF THE INVENTION: QUENCHING UNIT FOR REMOVING CURL FROM MULTILAYER POLYMERIC FILM HAVING ASYMMETRIC STRUCTURE AND PROCESS THEREOF

2. APPLICANT:
(a) NAME : Windsor Machines Limited
(b) NATIONALITY : Indian
(c) ADDRESS : Plot No. 5402-5403,
Phase IV, GIDC Vatva,
Ahmedabad-382445,
Gujarat, India.

3. PREMABLE TO THE DESCRIPTION
PROVISIONAL

The following specification describes the invention. þ COMPLETE

The following specification particularly describes the invention and the manner in which it is to be performed.

Field of Invention:

The present invention relates to a quenching unit for plastic film straightening and more particularly it relates a quenching unit and a process to remove the curling of film generated due to asymmetric structure of nylon and polyethylene during the production of multi layer films.

Background of the invention:

Polyethylene (PE) is widely used to prepare food packaging films and bags. Some applications, such as food packaging films and bags, require films having sufficient barrier property for water vapor and oxygen to preserve the contents. The packaging films usually have a multilayer structure. Depending on the intended application, the number, type, and arrangement of layers employed will vary. Ethylene-vinyl alcohol (EVOH) copolymers and nylons are often used as barrier layers with polyethylene. Use of polyethylene is must for sealing purpose.

Flexible packaging has many advantages in number of applications. To obtain the high performance films with superior properties, it is usually necessary the layers are two or more of different materials in a single structure. Nylon is frequently used as a component in the multilayer film structure due to its unique combination of the mechanical strength, puncture resistance, printing, transparency, thermal stability etc.

After the desired components are combined to form a multi-component matrix, including the polymer and other components as desired, the combination is formed into a sheet or film by any method known in the art Such as extrusion, coating, spreading, casting or drawing the multi-component matrix. If a multi-layered film is desired, this may be accomplished by co-extruding more than one combination of components which may be of the same or different composition. A multi-layered film may also be achieved by coating, spreading, or casting a combination onto an already formed film layer.

Multilayer films of 3, 5, 7 or more layer are standard in the film industry. If these multilayer films structure are asymmetric, the film will curl when placed on a flat surface. The presence of curl will cause problems during slitting, winding, printing and filling operation. Multilayer film having 5 or 7 layer film constructions allow the placing of the nylon layer in middle or near the center of the film. This produces a symmetric or near symmetric film that has virtually no tendency to curl. However asymmetric structure films with the nylon polymer in outer layer have many advantageous effect like thermoforming, printing, sealing etc.

Curl is the phenomenon of rolling seen in co-extruded multilayer film with at least two polymers having different re-crystallization temperature. When the multilayer structure of PA/tie resin/PE leaves the die of a blown or cast film extruder, all the materials are molten. The polymer chains arrange in a more or less random pattern or so-called “random coil.” As the film cools, the first material to reach its re-crystallization temperature is nylon. Due to super cooling that occurs in the rather viscous polymers, the re-crystallization temperature falls significantly below the melting temperature. Once the film reaches that temperature, the nylon will start to move into a regular pattern to form crystalline domains. Since these crystals have a higher density than the non-crystalline, amorphous arrangement, the crystallization causes shrinkage of approximately 2% to 3% in each direction. The re-crystallization temperature refers to the temperature at which a polymer solidifies after it has been molten. That is shows that the nylon firstly achieves the solidifier stage. At these temperatures, the second or polyethylene component is still molten. It will flow easily and adjust dimensionally with the PA contraction.

As the film continues to cool, the polyethylene will eventually reach its re-crystallization temperature and crystallize and shrink. Both re-crystallization temperature and the final degree of crystalline depend highly on the density of the polyethylene grade used. At this temperature, the PA is already fairly solid and cannot shrink much with the polyethylene. The film will therefore curl towards the polyethylene—the component that crystallizes last.

For removing the curl from the film, the film is to be passed from the hot water bath. When the film come out from the water bath, the water particles present on the surface of the film, due to hydroscopic nature of the nylon material it is very difficult to remove the water droplets from the surface of the film. The curl is generated due to different crystallization kinetics of the components having multilayer film. PA layer is the first to re-crystallize and shrink, which does not affect the planarity of the film construction. Re-crystallization of the PE layer which is the second to re-crystallize and shrink will end up in a curl towards the PE side. There are different types of techniques to reduce the curl from the film. Controlling the cooling rate of material is one of them. For the different type of materials the cooling rate is different.

At slow cooling rate, each polymer will have sufficient time to completely solidify at its re-crystallization temperature, causing a high degree of curl as mentioned before. But if the film is rapidly cooled, these two effects will occur. The first effect is the final degree of crystalline is decreased, causing less shrinkage. The second is the areas of crystallization of the two components the frost lines move closer. Therefore, a greater share of the crystallization process occurs simultaneously in both layers, so that the shrinkage forces neutralize each other. Theoretically, at infinite cooling rate, all polymers will crystallize at the same time. For both reasons, rapid quenching will reduce or eliminate curl. As heat transfer is much more efficient in cast film than in air cooled blown film, curl is a more pronounced problem for blown film than for cast film.

Various prior art have been disclosed the process for removing the water particles form the multilayer films. The prior art document US 3700763 describing about the film of an organic thermoplastic polymer is manufactured by drawing an extruded, inflated, hot, tubular film from an extruder and passing the film into contact with layers of cooling liquid supported by symmetrically disposed collapsing elements adapted to affect a partial but not complete collapse of the tubular film to the lay flat form, cooling liquid being simultaneously supplied to a plurality of locations distributed over the surfaces of the collapsing elements at a rate sufficient to maintain layers of cooling liquid thereon.

Another prior art document US 8,709,611 B2 Disclosed a multilayer film. The multilayer film has the general structure of A/B/A/C or B/A/B/C, wherein A is a nucleated high density polyethylene (HDPE) layer, B is a single or multilayer structure, and C is a seal layer. Adding a nucleating agent to HDPE improves the water vapor barrier property of the HDPE layer and the multilayer film, but it also causes the multilayer film to curl in the conventional multilayer film structures. The invention provides a multilayer film, which includes at least one layer of nucleated HDPE, with reduced or eliminated curling while retaining high water vapor barrier.

Moreover, the further prior art document US 4994214 Disclosed a process of making biaxial oriented polyethylene terephthalate photographic film having a controlled amount of curl in the longitudinal direction, wherein the file is subjected to longitudinal stretching while being asymmetrically heated across its thickness, then wound into a stock roll, and the stock roll thus obtained is heat-tempered. The stock roll after heat-tempering may be longitudinally slit, cut and rewound into smaller rolls in a winding direction opposite to the direction of the longitudinal curl induced in the film during the longitudinal asymmetrical heat-stretching.

The aforesaid conventional process encounters various problems which lead into the difficulties like after the quenching process the moisture from the film may not evaporated from the film due to the hydroscopic nature of the nylon. In multilayer if the moisture is present on the surface of the film than the curl takes place after winding the multilayer polymeric film. So that it is necessary to remove the moisture from the film before winding the same.

Hence, it is desperately needed to introduce quenching unit for film plastic straightening.

Object of Invention:

The main object of present invention is to provide quenching unit that provide an improved process of curl control for multilayer polymeric film.

Another object of present invention is to provide quenching unit that removes the 100% moisture from the surface of the film.

Further object of the present invention is the process for removing curl from multilayer polymeric film that eliminates the drawbacks associated with conventional curl removing process.

Summary of Invention:

The present invention relates to a quenching unit and process for removing curl from multilayer polymeric film having asymmetric structure. Said quenching unit have water quenching tank and water evaporation unit. The curl in the multilayer polymeric film is generated due to the different re-crystallization temperature of PE and PA. First, the multilayer polymeric film is passed through the water quenching tank for post crystallization of PA layer. Due to the hydroscopic nature of the nylon the water droplets present on the surface of the multilayer polymeric film. Further, in order to remove the moisture from the surface of the film, the film is subsequently passed through transport roller, an air blowing pipe having an air jet for blowing high velocity air, a diamond bar compensator, a rubber wiper compensator, a nip rollers assembly, an air suction pipe, a pre-winding aluminum roller and a plurality of pre-winding air suction pipes.

Brief Description of Drawings:

Other objects, advantages and novel features of the invention will become apparent from the following detailed description of the present embodiment when taken in conjunction with the accompanying drawings.

Figure 1 shows a schematic diagram of quenching unit according to present invention.

Figure 2 shows parts of the water quenching tank according to present invention.

Detailed description of the Invention:

Before explaining the present invention in detail, it is to be understood that the invention is not limited in its application to the details of the construction and arrangement of parts illustrated in the accompany drawings. The invention is capable of other embodiments, as depicted in different figures as described above and of being practiced or carried out in a variety of ways. It is to be understood that the phraseology and terminology employed herein is for the purpose of description and not of limitation.

The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the present invention may be embodied in practice.

It is to be also understood that the term "comprises" and grammatical equivalents thereof are used herein to mean that other components, ingredients, steps, etc. are optionally present. For example, an article "comprising" (or "which comprises") components A, B, and C can consist of (i.e., contain only) components A, B, and C, or can contain not only components A, B, and C but also contain one or more other components.

The present invention provides new approach for removing curl generated in multilayer polymeric films due to asymmetric structure of nylon and polyethylene during its manufacturing. It is to be understood that the polymeric film (PE/PA film) include the film having 3, 5, 7 or more layer of different materials. Further, it is to be understood that the multilayer polymeric sheet to be treated in quenching unit (1) according to present invention should have asymmetric structure of nylon and polyethylene.

Now, according to exemplary embodiment shown in Fig. 1, a diametric illustration of a quenching unit (1) is shown for carrying out the method for removing curl from the multilayer polymeric film according to present invention. Now as shown in Fig. 1, said quenching unit (1) according to present invention mainly comprise a water quenching tank (11) being capable of containing water and a water evaporation unit (12) located downstream to the said water quenching tank (11) for removing moisture from the multilayer polymeric film (2) being passed from the water quenching tank (11).

Referring continuous with Fig. 1, said water quenching tank (11) contains plurality of submerged guide rollers (R1, R2, R3, P1, P2, P3) being submerged into the water. The rollers are preferably made from MS and overall chrome plated for corrosion resistance. Said water tank is made from 3 mm thick SS sheet and outer structure is made from mild steel. Further, as shown in Fig 2, the water quenching tank (11) is equipped with a water overflow out (110), a water inlet (111), a water outlet (112), a temperature sensor (113), water drainage (114), a hot water spreading inlet pipe (115). The temperature sensor (113) monitors and maintains the temperature of the water quenching tank (11). Further, said water inlet (111) and outlet pipes are used to fill or remove the water in the water quenching tank (11) respectively. In present invention, the temperature of the water into the water tank is maintained in the range of the 200C to 850 C. Hence, means are provided, not illustrated, for controlling the level and the temperature of the water.
Referring again with Fig. 1, said water evaporation unit (12) comprises a transport roller (121) located downstream to the water quenching tank (11), an air blowing pipe (122) having an air jet for blowing high velocity air located downstream to the transport roller (121) , a diamond bar compensator (123) located downstream to the air blowing pipe (122), a rubber wiper compensator (124) located downstream to the diamond bar compensator (123), a nip rollers assembly (125) located downstream to the rubber wiper compensator (124), an air suction pipe (126) located downstream to the nip rollers assembly, a pre-winding aluminum roller (13) located downstream to the air suction pipe (126) and a plurality of pre-winding air suction pipes (131) located downstream to the pre-winding aluminum roller (13).

Said diamond bar compensator (123) comprises a couple of diamond shaped SS bar (123a, 123b) being parallelly located to define longitudinal space therebetween to allow the multilayer polymeric film (2) to slide therethrough. Further, said rubber wiper compensator (124) comprises a couple of diamond shaped SS bar (124a, 124b) being parallelly located to define longitudinal space therebetween to allow the multilayer polymeric film (2) to slide therethrough. In said rubber wiper compensator (124), each said bar (124a, 124b) is provided with a neoprene rubber wiper (124c).

Furthermore, said nip rollers assembly (125) comprises a driven steel roller (125a) and a rubber roller (125b) that is diametrically pressed against the steel roller (125a) with pneumatic cylinder to squeeze the film for removing the water. Said pneumatic cylinder is mechanical devices which use the power of compressed gas to produce a force in a reciprocating linear motion. Like hydraulic cylinders, something forces a piston to move in the desired direction. The piston is a disc or cylinder, and the piston rod transfers the force to the rubber roller (125b) so that said rubber roller (125b) press against the steel roller (125a).

Now, in the process for removing the curl from the multilayer polymeric sheet using aforementioned arrangement of the present embodiment, first the quenching process is carried out on the multilayer polymeric film (2) followed by the evaporation process for removing moisture from surface of the multilayer polymeric film (2). Now, initially the multilayer polymeric film (2) coming from the exit of the corona treatment unit (not shown) enters into the water quenching tank (11). The said water quenching tank (11) is filled with the water. For the better quenching process the temperature of the water required to maintain uniform more precisely in the range of 20 C0 to 85 C0. The temperature of the water is depending on the various parameters like thickness of the film, line speed of the machine and layer thickness ratio of the different material.

As shown in Fig 1, said multilayer polymeric film (2) passes from the water quenching tank (11). The path of the multilayer polymeric film (2) will be guided by the submerged guide rollers (R1, R2, R3, P1, P2, P3) located therein. Said path can be control through the pairs of the submerged guide rollers (R1, R2, R3, P1, P2, and P3) of the water quenching tank (11). The resting time of the multilayer polymeric film (2) into the water is different for different type of the multilayer polymeric film (2) structure.

There are two ways to change resting time of the multilayer polymeric film (2) in said water quenching tank (11). Continues referring Fig. 1, the multilayer polymeric film (2) enters into the water quenching tank (11) of the said quenching unit (1) through the corona treatment unit. Now, if the multilayer polymeric film (2) needs more resting time in the water quenching tank (11), then the multilayer polymeric film (2) will pass from the pair of rollers (P1). And if the multilayer polymeric film (2) require less time to resting in the water quenching tank (11) than the multilayer polymeric film (2) will pass from the pair of rollers (P3) of the said water quenching tank (11). Another way to control the resting time of the multilayer polymeric film (2) in the said water quenching tank (11) can be modified by changing the level of the water in the tank.

According to the present invention in the asymmetric structure of multilayer polymeric film (2) have nylon material in the outer layer. The said multilayer polymeric film (2) comes in to the contact with the water. The nylon material is hydroscopic in the nature so that the nylon layer carries some of the water droplets on the surface thereof while the multilayer polymeric film (2) comes out from the water quenching tank (11). Due to this nature, it is desirable to remove the water droplets from the surface of the multilayer polymeric film (2). The arrangement of the water evaporation unit (12) helps to remove water droplets as well as the moisture from the multilayer polymeric film (2).

Continues referring Fig 1, the multilayer polymeric film (2) surface comes out from the water quenching tank (11) enters to the water evaporation unit (12). In said water evaporation unit (12), first the multilayer polymeric film (2) is passed from the air blowing pipe (122) through the transport roller (121). Said multilayer polymeric film (2) is blown away by the air jet with high velocity air of the air blowing pipe (122). The high velocity air blown through the air blowing pipes (122) and majority of water droplets are thrown out in the water tank. However, there is still some water droplets present on the surface of the multilayer polymeric film (2). In order to remove these droplets, the multilayer polymeric film (2) is now subsequently passed from the diamond bar compensator (123) and the rubber wiper compensator (124) respectively to wipe out the remaining water particles from the surface of the multilayer polymeric film (2).

After blowing the air jet and passing the multilayer polymeric film (2) from the bars (123a, 123b) and neoprene rubber wipers (124c), still there will be wetness on the surface of the multilayer polymeric film (2) due to the hydroscopic nature of the nylon. Now the multilayer polymeric film (2) will be passing through the nip roller assembly (125). At this stage, the multilayer polymeric film (2) is squeezed between the steel roller (125a) and the rubber roller (125b). In this process, the driven steel roller (125a) pull the multilayer polymeric film (2) and the rubber roller (125b) being pressed against the steel roller (125a) with the help of pneumatic cylinder and due to this squeezing action, 98 to 99% water will be removed from the surface of the multilayer polymeric film (2). The high pressure created at the nip point of the rollers brings the layers into the intimate contact, and squeeze out any bubbles.

There is a path of the multilayer polymeric film (2) web of the 4 to 5 meters before it goes in to the winding station to form rolls. During this path the remaining water contents will be evaporated from the surface of the multilayer polymeric film (2). However, it is must to remove the 100% of the water from the multilayer polymeric film (2) surface before winding of the multilayer polymeric film (2). To ensure the same, multilayer polymeric film (2) coming out from the nip rollers assembly (125) is being passed through the air suction pipe (126) to shuck the moisture and air blowing for evaporation of the moisture from the surface of the multilayer polymeric film (2). Afterwards, the multilayer polymeric film (2) is advanced through the pre-winding aluminum roller (13) and then passed through the plurality of pre-winding air suction pipes (131) for evaporation of the moisture from the multilayer polymeric film (2). The multilayer polymeric film (2) coming out from the pre-winding air suction pipes (131) will have no moisture content on the surface, thereof. Thus, curl of asymmetric PE/PA multilayer polymeric film (2) can be eliminated by the process according to present invention. After performing said moisture evaporation process, the multilayer polymeric film (2) is finally wound on the roll without any curl.

The quenching unit (1) for multilayer polymeric film (2) straightening and process of the present invention is apparently advantageous over existing processes. Said process with simplified and unique arrangement provides 100% moisture free multilayer polymeric film (2).

The invention has been explained in relation to specific embodiment. It is inferred that the foregoing description is only illustrative of the present invention and it is not intended that the invention be limited or restrictive thereto. Many other specific embodiments of the present invention will be apparent to one skilled in the art from the foregoing disclosure. All substitution, alterations and modification of the present invention which come within the scope of the following claims are to which the present invention is readily susceptible without departing from the spirit of the invention. The scope of the invention should therefore be determined not with reference to the above description but should be determined with reference to appended claims along with full scope of equivalents to which such claims are entitled. The following example merely illustrates the invention.

The present invention is experimented and illustrated more in details in the following example. The example describes and demonstrates embodiments within the scope of the present invention. This example is given solely for the purpose of illustration and is not to be construed as limitations of the present invention, as many variations thereof are possible without departing from spirit and scope.

EXAMPLE 1: (Film production without passing from water tank)
No. of layers produced: 7
Production rate: 260 kg/hr.
Total film thickness: 70 microns
Total thickness variation: +/- 6.5% of total thickness (2 sigma)
Film width: 1440 mm
Machine line speed: 21.6 Metres/min.
Film structure: As per following table
Layer description A
(OUTER) B C D
(MIDDLE) E F G
(INNER)
Individual Layer thickness in microns 14.0 10.5 7.0 7.0 7.0 7.0 17.5
Material combination
of each layer C-40 LN
Nylon
(100%) 1018HA (80%)
mLLDPE
+
Bynel (20%) 1018HA (75%)
mLLDPE
+
22FA002 (25%)
LDPE 6026ML (75%)
mLLDPE
+
22FA002 (25%)
LDPE 6026ML (75%)
mLLDPE
+
22FA002 (25%)
LDPE 1018HA (75%)
mLLDPE
+
22FA002 (25%)
LDPE F19010 (75%)
LLDPE (Butene)
+
22FA002 (25%)
LDPE

Temperature of water: Not Applicable
Water bath water level: Not Applicable
Total resting time of film in water: Not Applicable
Curl on film (Curl index): 200 m-1

EXAMPLE – 2 (Film production passing from water tank)
No. of layers produced: 7
Production rate: 260 kg/hr.
Total film thickness: 70 microns
Total thickness variation: +/- 6.5% of total thickness (2 sigma)
Film width: 1440 mm
Machine line speed: 21.6 Metres/min.
Film structure: As per following table
Layer
description A
(OUTER) B C D
(MIDDLE) E F G
(INNER)
Individual Layer Thickness in microns 14.0 10.5 7.0 7.0 7.0 7.0 17.5
Material combination
of each layer C-40 LN
Nylon
(100%) 1018HA (80%)
mLLDPE
+
Bynel (20%) 1018HA (75%)
mLLDPE
+
22FA002 (25%)
LDPE 6026ML (75%)
mLLDPE
+
22FA002 (25%)
LDPE 6026ML (75%)
mLLDPE
+
22FA002 (25%)
LDPE 1018HA (75%)
mLLDPE
+
22FA002 (25%)
LDPE F19010 (75%)
LLDPE (Butene)
+
22FA002 (25%)
LDPE
Temperature of water: 40 Degree C.
Water bath water level: 255 mm
Total resting time of film in water: 3.26 Sec.
Curl on film (Curl index): 0 (No curl on film)

Observation:

The first example to be discussed the film production without passing the film from the water tank. From aforesaid results, it was noted that if the film is not passed from the water tank the curl is generated. The Curl index on the film is 200 m-1.

The second example to be discussed the film production by passing the film from the water tank. From aforesaid results, it was noted that if the film passed from the water tank the no curl is generated. The Curl index on the film is 0 m-1.

All of the disclosed and claimed apparatus and methods can be made and executed without undue experimentation in light of the present disclosure. While the system, apparatus and methods of this invention have been described in terms of preferred embodiments, it will be apparent to those of skill in the art that variations can be applied to the methods, system and apparatus and in the steps or in the sequence of steps of the methods described herein without departing from the concept, spirit and scope of the invention.

List of Reference Numerals

Quenching unit (1)
Multilayer polymeric film (2)
Water quenching tank (11)
Submerged guide rollers (R1, R2, R3, P1, P2, P3)
Water overflow out (110)
Water inlet (111)
Water outlet (112)
Temperature sensor (113)
Water drainage (114)
Water spreading inlet pipe (115)
Water evaporation unit (12)
Transport roller (121)
Air blowing pipe (122)
Diamond bar compensator (123)
Bar (123a, 123b)
Rubber wiper compensator (124)
Bar (124a, 124b)
Neoprene rubber wiper (124c)
Nip rollers assembly (125)
Steel roller (125a)
Rubber roller (125b)
Air suction pipe (126)
Pre-winding aluminum roller (13)
Pre-winding air suction pipes (131)