DESC:CROSS - REFERENCE TO RELATED APPLICATION
This Application is based on and derives the benefit of Indian Provisional Application 202441009998 filed on 14th February 2024, the contents of which are incorporated herein by reference.
TECHNICAL FIELD
[001] The embodiments herein generally relate to injection molding systems and more particularly, to a hot runner injection molding system.
BACKGROUND
[002] Generally, an injection molding system is used for manufacturing plastic products by injection molding process. Injection molding is a process in which a resin in a molten state is injected into a mold and then cooled to form the product. The hot runner system is an injection molding assembly that includes heated channels and nozzles that maintain plastic resin in a molten state and inject it directly into a mold cavity. The hot runner system reduces material waste, improves the quality of molded parts, and increases production efficiency by eliminating the need for a cold runner, resulting in faster cycle times and cost savings.
[003] Typically, the nozzles of the hot runner systems are provided with circular cross-section brass heater sleeves. Further, these nozzles are constructed from materials such as H13 or stainless steel and include a flange for positioning within mold plates. The nozzles of the hot runner systems are subjected to poor heating efficiency due to brass sleeve heaters having a higher thermal expansion at process temperature thereby leaving a gap between the nozzle body and heater sleeve. Further, excessive temperature loss of resin at the flange area of the nozzle is observed as the thermal conductivity of H13 and stainless steel are comparatively higher, combined with the lack of a heat source at this section of the nozzle. Furthermore, an additional challenge with conventional hot runners is the leakage of resin through manifold plugs under the operating temperature and pressure. Therefore, depending only on the torque values of grub screws does not provide proper sealing at the manifold plug.
[004] Furthermore, in hot runner systems that utilize thermal gating, the nozzle tip is subject to increased thermal and mechanical stress, which renders it susceptible to wear. Conventionally manufactured from copper, the nozzle tip experiences significant wear, particularly at its end portion, necessitating frequent replacements. Whereas, in hot runner systems employing cylindrical valve gating, the loosening of components such as the pin guide and nozzle nut can lead to misalignment of the cylindrical pin during operation. This misalignment not only damages the nozzle tip but also adversely affects the cylindrical pin, resulting in the need for regular maintenance and replacements.
[005] Therefore, there exists a need for a hot runner injection molding system, which obviates the aforementioned drawbacks.
OBJECTS
[006] The principal object of embodiments herein is to provide a hot runner injection molding system that is configured to minimize thermal and material loss while enhancing energy efficiency.
[007] Another object of embodiments herein is to provide the hot runner injection molding system that enables efficient and uniform distribution of molten material to multiple cavity inserts, minimizing material waste and improving molding consistency.
[008] Another object of embodiments herein is to provide the hot runner injection molding system with a nozzle assembly that includes a nozzle heater sleeve that is configured to be interference fitted onto a nozzle body, thereby ensuring better fit and improving heating of the nozzle body.
[009] Another object of embodiments herein is to provide the hot runner injection molding system with a flange that is interference-fitted onto the nozzle body, wherein the flange is made of a low thermal conductivity material to reduce heat loss at the interface between the nozzle body and the manifold assembly.
[0010] Another object of embodiments herein is to provide the hot runner injection molding system with a plug assembly at a bend portion of the manifold channel to prevent lateral leakage of molten material, thereby improving system reliability and reducing maintenance requirements.
[0011] Another object of embodiments herein is to provide the hot runner injection molding system configured for thermal gating, wherein a thermally conductive and wear-resistant pin is incorporated within the nozzle tip to regulate the flow of molten material into the cavity insert.
[0012] Another object of embodiments herein is to provide the hot runner injection molding system configured for cylindrical valve gating, having a nozzle assembly that includes a pin guide and a nut, wherein the pin guide is interference-fitted into the nut to create an integrated structure that allows precision in guiding a cylindrical pin through the nozzle assembly.
[0013] These and other objects of embodiments herein will be better appreciated and understood when considered in conjunction with following description and accompanying drawings. It should be understood, however, that the following descriptions, while indicating embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.

BRIEF DESCRIPTION OF DRAWINGS
[0014] The embodiments are illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:
[0015] Fig. 1A depicts an isometric view of a hot runner injection molding system, according to a first embodiment as disclosed herein;
[0016] Fig. 1B depicts an isometric view of the hot runner injection molding system, according to a second embodiment as disclosed herein;
[0017] Fig. 2A depicts a sectional view of the hot runner injection molding system, according to the first embodiment as disclosed herein;
[0018] Fig. 2B depicts a sectional view of the hot runner injection molding system, according to the second embodiment as disclosed herein;
[0019] Fig. 3 depicts a sectional view of a plug assembly of the hot runner injection molding system, according to embodiments as disclosed herein;
[0020] Fig. 4A depicts an isometric view of the plug assembly of the hot runner injection molding system, according to embodiments as disclosed herein;
[0021] Fig. 4B depicts an exploded view of the plug assembly of the hot runner injection molding system, according to embodiments as disclosed herein
[0022] Fig. 5 depicts an isometric view of a nozzle assembly of the hot runner injection molding system, according to the first embodiment as disclosed herein;
[0023] Fig. 6 depicts an exploded view of the nozzle assembly of the hot runner injection molding system, according to the first embodiment as disclosed herein;
[0024] Fig. 7 depicts an isometric view of a nozzle heater sleeve, according to embodiments as disclosed herein;
[0025] Fig. 8A depicts an isometric view of a nozzle body, according to embodiments disclosed herein;
[0026] Fig. 8B depicts an exploded view of the nozzle body and a portion of a flange, according to embodiments as disclosed herein;
[0027] Fig. 9 depicts a sectional view of a nozzle nut assembly, according to the first embodiments as disclosed herein;
[0028] Fig. 10 depicts an exploded sectional view of the nozzle nut assembly , according to the first embodiment as disclosed herein;
[0029] Fig. 11 depicts a sectional view of the nozzle nut assembly , according to the second embodiment as disclosed herein;
[0030] Fig. 12 depicts an exploded sectional view of the nozzle nut assembly , according to the second embodiment as disclosed herein; and
[0031] Fig. 13 depicts a closer sectional view of the nozzle nut assembly , according to the second embodiment as disclosed herein.
DETAILED DESCRIPTION
[0032] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0033] The embodiments herein achieve a hot runner injection molding system that that is configured to minimize thermal and material loss while enhancing energy efficiency. Further, embodiments herein achieve the hot runner injection molding system that enables efficient and uniform distribution of molten material to multiple cavity inserts, minimizing material waste and improving molding consistency. Referring now to the drawings Figs. 1 through 13, where similar reference characters denote corresponding features consistently throughout the figures, there are shown embodiments.
[0034] Figs. 1A and 2A depict an isometric view and a sectional view of a hot runner injection molding system (100) respectively, according to a first embodiment as disclosed herein. Figs. 1B and 2B depict an isometric and a sectional view of the hot runner injection molding system (100) respectively, according to a second embodiment as disclosed herein. The system (100) includes a manifold assembly (200), and at least one nozzle assembly (300)¬¬¬¬¬¬¬¬¬¬¬¬. In the first embodiment, the hot runner injection molding system (100) is configured for thermal gating. In the second embodiment, the hot runner injection molding system (100) is configured for cylindrical valve gating. For the purpose of this description and ease of understanding, the system (100) is explained herein with below reference to the hot runner injection molding system (100) having thermal gating and cylindrical valve gating. However, it is also within the scope of the invention to use/practice the components of the system (100) for the hot runner injection molding system having any other gating mechanism such as but not limited to horizontal side gating and vertical side gating, without otherwise deterring the intended function of the system (100) as can be deduced from the description and corresponding drawings. The manifold assembly (200) is configured to distribute molten material through at least one manifold channel (204) towards the at least one nozzle assembly (300). The at least one nozzle assembly (300) is coupled to the manifold assembly (200) and is configured to direct and inject the molten material into the at least one cavity insert (400) (shown in figs. 2A and 2B). It is within the scope of this invention to have more than one nozzle assembly (300), wherein each nozzle assembly (300) is coupled with a corresponding cavity insert (400), thereby facilitating the injection of molten material simultaneously into a plurality of cavity inserts during a single injection molding cycle.
[0035] In an embodiment, the manifold assembly (200) includes a manifold plate (202) configured to distribute molten material, wherein the at least one manifold channel (204) is formed within the manifold plate (202) for directing the molten material towards the at least one nozzle assembly (300). Further, the manifold assembly (200) includes at least one manifold heater (220) thermally coupled to the manifold plate (202) to maintain a predetermined processing temperature. Furthermore, in an embodiment, the manifold plate (202) is configured to receive molten material from a sprue bush (102) which is heated by a sprue bush heater (104) to maintain the temperature of the molten material. In an embodiment, the manifold plate (202) is coupled to a cavity plate (106). The at least one cavity insert (400) is mounted within the cavity plate (106) and is adapted to form a mold cavity (402) for a final product. The cavity plate (106) is supported by a cavity back plate (108), which provides structural stability and thermal isolation. The molten material flows from the manifold plate (202) into the cavity insert (400) via the nozzle assembly (300), ensuring uniform filling of the mold cavity (402). Further, in an embodiment, the system (100) includes a manifold locator (110) which ensures precise alignment of the manifold channel (204) with the cavity plate (106) and a top plate (116), and a spacer disc (112), secured with spacer disc screws (114), which maintains the spacing between the manifold plate (202) and the top plate (116), ensuring proper thermal isolation and alignment. Further, in an embodiment, the manifold assembly (200) includes a manifold T-plug (218) configured to seal unused manifold channels to direct the flow of molten material into the manifold channels that are operative.
[0036] Figs. 3, 4A, and 4B depict a sectional view, an isometric view, and an exploded view of a plug assembly (210) respectively, according to embodiments as disclosed herein. In an embodiment, the manifold assembly (200) includes the plug assembly (210) provided in fluid communication with the at least one manifold channel (204) (shown in figs. 2A to 3). The plug assembly (210) is configured to prevent molten material leakage by restricting the lateral flow of the molten material. Further, the plug assembly (210) is positioned at a bend portion (204A) of the manifold channel (204) where the flow of the molten material transitions from a lateral direction to a vertical direction, towards the nozzle assembly (300). In an embodiment, the plug assembly (210) includes a plug (212) provided in contact with the bend portion (204A) of the manifold channel (204), a screw (214) configured to be tightened against the plug (212), and at least one sealing member (216) inserted at an interface between the plug (212) and the screw (214). The sealing member (216) is made of a thermally conductive and malleable material, and is compressed against the plug (212) when the screw (214) is tightened, thereby forming a seal therebetween. The sealing member (216) provides additional sealing at the bend portion (204A) of the manifold channel (204), thereby plugging the leakage of the molten material when it flows into the nozzle assembly (300). In an embodiment, the at least one sealing member (216) is a ring made of copper. However, it is within the scope of this invention to have the sealing member (216) made of any other malleable and thermally conductive metal and alloy, without otherwise deterring from the intended purpose of the sealing member
[0037] Figs. 5 and 6 depict an isometric view and an exploded view of the nozzle assembly (300) respectively, according to the first embodiment as disclosed herein. In an embodiment, the at least one nozzle assembly (300) includes a nozzle body (302), a nozzle nut assembly (306), and a nozzle heater sleeve (308). The nozzle body (302) has a nozzle channel (304) defined in fluid communication with the at least one manifold channel (204) to receive the molten material (shown in fig. 2A). Further, the nozzle nut assembly (306) is connected at a bottom end (302B) of the nozzle body (302) to facilitate controlled injection of the molten material into the at least one cavity insert (400) (shown in fig. 2A). Furthermore, the nozzle heater sleeve (308) is adapted to be disposed around the nozzle body (302) to regulate the temperature of the molten material.
[0038] Fig. 7 depicts an isometric view of the nozzle heater sleeve (308), according to embodiments as disclosed herein. The nozzle heater sleeve (308) includes a slit (308A) extending along its height-wise direction to facilitate an interference fit onto the nozzle body (302), thereby ensuring a secure and thermally efficient coupling between the nozzle heater sleeve (308) and the nozzle body (302). The slit (308A) in the nozzle heater sleeve (308) enables direct contact with the nozzle body (302). In contrast to traditional nozzle heater sleeves, which are continuous structures and necessitate a clearance due to transition fitting, the nozzle heater sleeve (308) eliminates that requirement. Additionally, the slit (308A) facilitates radial and circumferential thermal expansion of the nozzle heater sleeve (308). This ensures that consistent contact is maintained between the nozzle heater sleeve (308) and the nozzle body (302) throughout the heating process.
[0039] In an embodiment, the nozzle heater sleeve (308) includes a V-shaped notch (308B) defined at a top portion (308T) of the nozzle heater sleeve (308), and a slot (308C) defined laterally across the slit (308A). The V-shaped notch (308B) allows the insertion of a thermocouple (120) onto the nozzle body (302), and also facilitates in guiding the assembling of the nozzle heater sleeve (308) with the nozzle body (302). Further, the slot (308C) is configured to receive a tool to allow the removal of the nozzle heater sleeve (308) from the nozzle body (302), thereby providing ease in the maintenance of the nozzle assembly (300). In an embodiment, the nozzle heater sleeve (308) has a plurality of heating elements (308H) provided circumferentially across the height-wise direction of the nozzle heater sleeve (308). Furthermore, in an embodiment, the nozzle heater sleeve (308) is made of brass. However, it is within the scope of this invention to have the nozzle heater sleeve (308) with the plurality of heating elements (308H) provided in any other arrangement, and made of any other thermally conductive material, such as but not limited to copper.
[0040] Further, in an embodiment, the at least one nozzle assembly (300) includes a flange (310) coupled to a top end portion (302A) of the nozzle body (302) to secure the nozzle body (302) to the manifold assembly (200) (shown in figs. 2A, 2B, 6, 8A, and 8B). In an embodiment, the flange (310) is adapted to be shrink-fitted onto the top end portion (302A) of the nozzle body (302). However, it is within the scope of this invention to connect the flange to the top end portion (302A) of the nozzle body (302) by any other method for interference fitting, such as but not limited to press fitting, snap fitting, and the like. In an embodiment, the flange (310) is made of a material having lower thermal conductivity than the nozzle body (302) and the manifold plate (202) of the manifold assembly (200), thereby reducing heat loss at the top end portion (302A) of the nozzle body (302). Furthermore, in an embodiment, the flange (310) is made of titanium. However, it is within the scope of this invention to have the flange (310) made of any other material having low thermal conductivity and high structural strength. The flange (310), characterized by its low thermal conductivity, effectively inhibits heat transfer from the higher-temperature nozzle body (302) to the cooler manifold plate (202). This ensures that the molten material is consistently maintained at the optimal temperature at the top portion (302A) of the nozzle body (302), where the nozzle heater sleeve (308) does not extend.
[0041] The molten material enters the system (100) through the sprue bush (102), where it is heated and maintained at the required temperature by the sprue bush heater (104). From the sprue bush (102), the molten material is directed into the manifold plate (202), which acts as a central distribution component. The manifold plate (202), heated uniformly by the manifold heater (220), distributes the molten material to the at least one nozzle assembly (300) through the at least one manifold channel (204). The molten material flows from the manifold plate (202) into the nozzle body (302), where it is further heated and regulated before being directed into the corresponding cavity insert (400) through the nozzle nut assembly (306), wherein the nozzle heater sleeve (308) maintains the temperature of the molten material during its passage through the nozzle channel (304). This arrangement ensures precise and consistent filling of the mold cavity (402) within the cavity plate (106).
[0042] Figs. 9 and 10 depict a sectional view and an exploded sectional view of the nozzle nut assembly (306) respectively, according to the first embodiment as disclosed herein. In the first embodiment, the nozzle nut assembly (306) incorporates a thermally regulated gate that controls the flow of the molten material into the cavity insert (400). The thermal gating mechanism utilizes the nozzle heater sleeve (308) and the sprue bush heater (104) to maintain precise temperature control, ensuring accurate molten material flow into the cavity insert (400). In the first embodiment, the nozzle nut assembly (306) includes a nozzle tip (306A) and a tip pin (312) configured to be inserted into the nozzle tip (306A). The tip pin (312) is configured to direct the molten material into the cavity insert (400). In an embodiment, the tip pin (312) is made of a thermally conductive and wear-resistant material, thereby increasing the longevity and wear resistance of the nozzle tip (306A). In an embodiment, the tip pin (312) is adapted to be press-fitted into a collar (306C) defined at the nozzle tip (306A), thereby allowing ease in removal of the tip pin (312). Further, in an embodiment, the tip pin (312) is made of steel. The nozzle tip (306A) is adapted to taper towards its end in the direction of the cavity insert (400), resulting in increased thermal and mechanical stress concentrated at this endpoint. Conventional nozzle tips, typically constructed from copper, often suffer from wear due to their relatively low mechanical strength and thermal resistance. However, the addition of the tip pin (312) enhances the wear resistance of the nozzle tip (306A) by significantly improving its mechanical strength and thermal tolerance at the end (306A). This ensures a more durable and reliable performance of the nozzle tip (306A) under demanding conditions. Further, in the first embodiment, the nozzle nut assembly (300) includes a thermal nut (314) that is configured to connect the nozzle tip (306A) with the nozzle body (302).
[0043] Figs. 11, 12, and 13 depict a sectional view, an exploded sectional view, and a closer sectional view of the nozzle nut assembly (306), according to the second embodiment as disclosed herein. In the second embodiment, the system (100) is configured for cylindrical valve gating, wherein a cylindrical pin (320) is operated to control an opening and a closing of the nozzle nut assembly (306). In the second embodiment, the system (100) includes at least one valve pin controlling mechanism (300A) coupled to the cylindrical pin (320) of a corresponding nozzle assembly (300). In an embodiment, the valve pin controlling mechanism (300A) is pneumatically actuated. Further, in an embodiment, the cylindrical pin (320) is coupled to the manifold plate (202) through a connector assembly (320). In the second embodiment, the nozzle nut assembly (306) includes a pin guide (322), and a nut (324) configured to connect the pin guide (322) to the nozzle body (302). In an embodiment, the pin guide (322) is shrink-fitted into the nut (324), thereby forming an integrated component. Further, in an embodiment, the nozzle tip (306A) includes a pin liner (326), wherein the pin liner (326) is configured to be connected to the pin guide (322), and shrink-fitted into the nut (324). However, it is within the scope of this invention to connect the pin guide (322) and the nut (324) through any other interference fitting such as but not limited to press fitting. In an embodiment, a pin bore (322B) (shown in fig, 12) is defined in the pin guide (322) to guide the cylindrical pin (320) through the nozzle assembly (300) after connecting the pin guide (322) and the pin liner (326) with the nut (324), thereby ensuring alignment of the cylindrical pin (320) with the pin bore (322B) during operation of the pin (320). The process of shrink-fitting the pin guide (322) and the pin liner (326) onto the nut (324) significantly reduces assembly tolerances by effectively eliminating any potential for loosening between the pin guide (322), pin liner (326), and nut (324). Additionally, defining the pin bore (322B) after the assembly of the pin guide (322) with the nut (324) addresses the risk of misalignment, thereby ensuring precise movement of the cylindrical pin (320) within the pin bore (322B). This approach enhances the overall functionality and accuracy of the nozzle assembly (300).
[0044] The technical advantages of the hot runner injection molding system (100) are as follows. Minimizes thermal and material losses, thereby improving thermal efficiency, ensures efficient and uniform heating of the nozzle body (302), increases wear resistance of the nozzle tip (306A) thereby reducing the need to frequently replace the nozzle tip (306A), is cost-effective, and provides ease in assembly.
[0045] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modifications within the spirit and scope of the embodiments as described herein.
[0046] List of reference numerals:
Reference Numeral Description
100 Hot runner injection molding system
102 Sprue bush
104 Sprue heater
106 Cavity plate
108 Cavity backplate
110 Manifold locator
112 Spacer disc
114 Spacer disc screws
120 Thermocouple
200 Manifold assembly
202 Manifold plate
204 Manifold channel
204A Bend portion of the manifold channel
210 Plug assembly
212 Plug
214 Screw
216 Sealing member
218 Manifold T-plug
220 Manifold heater
300 Nozzle assembly
300A Valve pin controlling mechanism
302 Nozzle body
302A Top end portion of the nozzle body
302B Bottom end of the nozzle body
304 Nozzle channel
306 Nozzle nut assembly
306A Nozzle tip
306C Collar of nozzle tip
308 Nozzle heater sleeve
308A Slit of nozzle heater sleeve
308B V-shaped notch of the nozzle heater sleeve
308C Slot of the nozzle heater sleeve
308H Plurality of heater elements
308T Top portion of the nozzle heater sleeve
310 Flange
312 Tip pin
314 Thermal nut
320 Cylindrical pin
320A Connector assembly
322 Pin guide
322B Pin bore
324 Nut
326 Pin liner
400 Cavity insert
402 Mold cavity
,CLAIMS:We claim:
1. A hot runner injection molding system (100), the system (100) comprising:
a manifold assembly (200) configured to distribute molten material through at least one manifold channel (204); and
at least one nozzle assembly (300) coupled to the manifold assembly (200) and configured to direct and inject the molten material into at least one cavity insert (400), wherein the at least one nozzle assembly (300) comprises:
a nozzle body (302), wherein the nozzle body (302) has a nozzle channel (304) defined in fluid communication with the at least one manifold channel (204) to receive the molten material;
a nozzle nut assembly (306) connected at a bottom end (302B) of the nozzle body (302) to facilitate controlled injection of the molten material into the at least one cavity insert (400); and
a nozzle heater sleeve (308) adapted to be disposed around the nozzle body (302) to regulate the temperature of the molten material,
wherein the nozzle heater sleeve (308) includes a slit (308A) extending along its height-wise direction to facilitate an interference fit onto the nozzle body (302), thereby ensuring a secure and thermally efficient coupling between the nozzle heater sleeve (308) and the nozzle body (302).
2. The system (100) as claimed in claim 1, wherein the at least one nozzle assembly (300) includes a flange (310) coupled to a top end portion (302A) of the nozzle body (302) to secure the nozzle body (302) to the manifold assembly (200),
wherein
the flange (310) is adapted to be interference-fitted onto the top end portion (302A) of the nozzle body (302); and
the flange (310) is made of a material having lower thermal conductivity than the nozzle body (302) and a manifold plate (202) of the manifold assembly (200), thereby reducing heat loss at the top end portion (302A) of the nozzle body (302).
3. The system (100) as claimed in claim 1, wherein the manifold assembly (200) includes a plug assembly (210) provided in fluid communication with the at least one manifold channel (204),
wherein
the plug assembly (210) is configured to prevent molten material leakage by restricting lateral flow of the molten material;
the plug assembly (210) is positioned at a bend portion (204A) of the manifold channel (204) where the flow of the molten material transitions from a lateral direction to a vertical direction, towards the nozzle channel (304);
the plug assembly (210) comprises:
a plug (212) provided in contact with the bend portion (204A) of the manifold channel (204);
a screw (214) configured to be tightened against the plug (212); and
at least one sealing member (216) inserted at an interface between the plug (212) and the screw (214);
the sealing member (216) is made of a thermally conductive and malleable material; and
the sealing member (216) is compressed against the plug (212) when the screw (214) is tightened, thereby forming a seal therebetween.
4. The system (100) as claimed in claim 1, wherein the system (100) is configured for thermal gating, wherein the nozzle nut assembly (300) includes a nozzle tip (306A), and a tip pin (312) configured to be inserted into the nozzle tip (306A),
wherein the tip pin (312) is:
configured to direct the molten material into the cavity insert (400); and
made of a thermally conductive and wear-resistant material, thereby increasing wear resistance of the nozzle tip (306A).
5. The system (100) as claimed in claim 1, wherein the system (100) is configured for cylindrical valve gating, wherein a cylindrical pin (320) is operated to control an opening and a closing of the nozzle nut assembly (306),
wherein
the nozzle nut assembly (306) includes:
a pin guide (322); and
a nut (324) configured to connect the pin guide (322) to the nozzle body (302); and
the pin guide (322) is interference-fitted with the nut (324), thereby forming an integrated component.
6. The system (100) as claimed in claim 5, wherein the nozzle nut assembly (306) includes a pin liner (326), wherein the pin liner (326) is configured to be connected to the pin guide (322), and shrink-fitted into the nut (324).
7. The system (100) as claimed in claim 6, wherein a pin bore (322B) is defined to guide the cylindrical pin (320) through the nozzle assembly (300) after connecting the pin guide (322) and the pin liner (326) with the nut (324), thereby ensuring alignment of the cylindrical pin (320) with the pin bore (322B) during operation of the pin (320).
8. The system (100) as claimed in claim 1, wherein the nozzle heater sleeve (308) includes:
a V-shaped notch (308B) defined at a top portion (308T) of the nozzle heater sleeve (308) to allow insertion of a thermocouple and guide assembling of the nozzle heater sleeve (308) with the nozzle body (302); and
a slot (308C) defined laterally across the slit (308A), wherein the slot (308C) is configured to receive a tool to allow removal of the nozzle heater sleeve (308) from the nozzle body (302), thereby providing ease in maintenance of the nozzle assembly (300).
9. The system (100) as claimed in claim 8, wherein the nozzle heater sleeve (308) has a plurality of heating elements (308H) provided circumferentially across the height-wise direction of the nozzle heater sleeve (308), and wherein the nozzle heater sleeve (308) is made of a material comprising brass.

10. The system (100) as claimed in claim 2, wherein the flange (310) is made of titanium.
11. The system (100) as claimed in claim 3, wherein the at least one sealing member is made of copper.
12. The system (100) as claimed in claim 4, wherein the tip pin (312) is adapted to be press-fitted into a collar (306C) defined in the nozzle tip (306A), thereby allowing ease in removal of the tip pin (312), and wherein the tip pin (312) is made of steel.