Special component for injection molding of anisotropic nozzle core type easy-shrinkable plastic product

Abstract

This utility model relates to the field of easily shrinkable plastic products and discloses a special injection molding component for easily shrinkable plastic products with an irregularly shaped nozzle core. It includes a hot nozzle body, a hot runner channel formed within the hot nozzle body for conveying plastic raw materials, a hot nozzle heater located on the outside of the hot nozzle body for heating and maintaining the temperature of the plastic raw materials within the hot nozzle body, a nozzle core located at the dispensing end of the hot nozzle body for controlling plastic flow, distributing plastic flow rate, and regulating plastic temperature, and a sprue located within the hot nozzle body, inserted between the nozzle core and the hot nozzle body to fix the nozzle core to the dispensing end of the hot nozzle body. The nozzle core adopts a cylindrical irregular design, limiting flow rate through a narrow inlet orifice and guiding a uniform flow channel through an inclined inlet surface. Combined with the hot nozzle heater, it maintains the molten state of the raw materials, achieving uniform filling and rapid cooling of easily shrinkable materials, significantly reducing product shrinkage defects. Simultaneously, the cylindrical structure of the nozzle core and the fixing protrusion enhance wear resistance.

Description

Technical Field

[0001] This utility model relates to the field of easily shrinkable plastic products, specifically a special injection molding component for easily shrinkable plastic products with an irregularly shaped nozzle core. Background Technology

[0002] In the field of plastic product injection molding, the processing of easily shrinkable plastic materials has always been a major challenge. Because these materials are prone to dimensional changes during the molding process due to cooling and solidification, it is difficult to guarantee the precision and quality of the products. This not only increases the complexity and cost of production, but also places higher demands on mold design and process parameter control.

[0003] Due to the significant difference in volume shrinkage rates between melting and cooling, traditional pointed nozzle designs typically employ wide inlets and single runners, leading to uneven filling within the mold cavity. This results in the accumulation of shrinkage stress during cooling, causing shrinkage defects and affecting the product's dimensions and surface quality. Furthermore, conventional pointed nozzles lack wear resistance and are prone to wear and deformation under long-term high temperature and pressure conditions, increasing maintenance costs and interfering with injection molding efficiency. Additionally, the simple end structure of traditional nozzles cannot effectively guide the flow of shrinkable materials, causing turbulence and stagnation during the flow process, reducing filling speed and uniformity, and making it difficult to meet the high-precision injection molding requirements of complex products. Therefore, we propose a special injection molding component for shrinkable plastic products using a non-circular nozzle design. Utility Model Content

[0004] (1) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a special injection molding component for easily shrinking plastic products with an irregularly shaped nozzle core, thus solving the aforementioned problems.

[0006] (II) Technical Solution

[0007] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a special component for injection molding of easily shrinkable plastic products with a shaped nozzle core, including a hot nozzle body, and further comprising:

[0008] A hot runner channel is formed within the hot nozzle body, through which plastic raw materials are transported;

[0009] The hot nozzle heater, located on the outside of the hot nozzle body, heats and keeps the plastic material inside the hot nozzle body warm.

[0010] The nozzle core is located at the dispensing end of the hot nozzle body. The nozzle core is a cylindrical structure with an opening at one end. The hot flow channel corresponds to the hollow structure inside the nozzle core. The nozzle core is used to control the plastic flow, distribute the plastic flow rate, and regulate the plastic temperature.

[0011] A gate valve is installed inside the hot nozzle body. The gate valve is inserted between the nozzle core and the hot nozzle body, fixing the nozzle core to the dispensing end of the hot nozzle body.

[0012] Preferably, one end of the hot nozzle body is fixedly connected to an installation sleeve, which is located on the outside of the hot nozzle body, and one end of the hot nozzle heater is snapped between the installation sleeve and the hot nozzle body.

[0013] Preferably, the hot nozzle heater has a hot nozzle wiring connection on one end inside the mounting sleeve, and the other end of the hot nozzle wiring connection is connected to an external power supply wiring connection.

[0014] Preferably, the end of the mounting sleeve not connected to the hot nozzle body has a wiring groove, and the end of the hot nozzle wiring away from the hot nozzle heater passes through the wiring groove outside the mounting sleeve.

[0015] Preferably, a fixing protrusion is fixedly connected to the open end of the nozzle core, and the end of the nozzle core connected to the fixing protrusion is connected to the dispensing end of the hot nozzle body.

[0016] Preferably, the nozzle core has two glue inlet cuts at one end away from the fixed protrusion. The glue inlet cuts are symmetrical about the nozzle core on both sides. The glue inlet cuts do not penetrate into the interior of the nozzle core. Each of the two glue inlet cuts has a glue inlet hole on the side parallel to the opening end of the nozzle core. The glue inlet hole extends into the interior of the nozzle core.

[0017] Preferably, the nozzle core has two glue-injecting inclined surfaces at the end opposite to the fixed protrusion. The two glue-injecting inclined surfaces correspond to the glue-injecting cut, and the side of the glue-injecting inclined surface away from the glue-injecting cut is inclined towards the center of the nozzle core.

[0018] Preferably, the hot nozzle body has a fixing groove at the dispensing end, the nozzle core with a fixing protrusion at one end is inserted into the fixing groove, the sprue is inserted into the fixing groove and sleeved on the outside of the nozzle core, and the fixing protrusion is engaged between the sprue and the opposite side of the fixing groove opening.

[0019] (III) Beneficial Effects

[0020] Compared with the prior art, this utility model provides a special injection molding component for easily shrinkable plastic products with irregularly shaped nozzle cores, which has the following beneficial effects:

[0021] This irregularly shaped nozzle core is a dedicated injection molding component for easily shrinkable plastic products. The nozzle core features a cylindrical, irregular design, with a narrow inlet hole to limit flow and a beveled inlet surface to guide a uniform flow path. Combined with a hot nozzle heater, it maintains the raw material in a molten state, achieving uniform filling and rapid cooling of easily shrinkable materials, significantly reducing product shrinkage defects. At the same time, the cylindrical structure of the nozzle core and the fixing protrusion enhance wear resistance, while the plug-in design of the gate and fixing groove improves installation and maintenance convenience. The coordinated layout of the hot runner and heating system ensures accurate temperature control, effectively reducing equipment maintenance costs and improving production stability. It is suitable for injection molding of high-precision plastic products. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is an exploded view of the structure of this utility model;

[0024] Figure 3 This is a cross-sectional view of the structure of this utility model;

[0025] Figure 4 This is a cross-sectional view of the structure of this utility model;

[0026] Figure 5 for Figure 4 A magnified view of part A in the diagram.

[0027] In the diagram: 1. Hot nozzle heater; 2. Inlet bevel; 3. Sprue; 4. Hot nozzle wiring; 5. Wiring groove; 6. Mounting sleeve; 7. Hot runner; 8. Hot nozzle body; 9. Nozzle core; 10. Fixing protrusion; 11. Inlet cut; 12. Inlet hole; 13. Fixing groove. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figure 1-5 A special injection molding component for easily shrinkable plastic products with a non-circular nozzle core, including a hot nozzle body 8, and further comprising:

[0030] The hot runner 7, located inside the hot nozzle body 8, conveys plastic raw materials.

[0031] The hot nozzle heater 1, located on the outside of the hot nozzle body 8, heats and keeps the plastic material inside the hot nozzle body 8 warm.

[0032] The nozzle core 9 is located at the dispensing end of the hot nozzle body 8. The nozzle core 9 is a cylindrical structure with an opening at one end. The hot runner 7 corresponds to the hollow structure inside the nozzle core 9. The nozzle core 9 is used to control the plastic flow, distribute the plastic flow rate, and regulate the plastic temperature.

[0033] The sprue 3 is installed inside the hot nozzle body 8. The sprue 3 is inserted between the nozzle core 9 and the hot nozzle body 8, fixing the nozzle core 9 to the dispensing end of the hot nozzle body 8.

[0034] Furthermore, a mounting sleeve 6 is fixedly connected to one end of the hot nozzle body 8, which is located on the outside of the hot nozzle body 8. One end of the hot nozzle heater 1 is snapped between the mounting sleeve 6 and the hot nozzle body 8. The mounting sleeve 6 is used to install the hot nozzle heater 1.

[0035] Furthermore, the hot nozzle heater 1 has a hot nozzle wiring 4 connected to one end inside the mounting sleeve 6, and the other end of the hot nozzle wiring 4 is connected to an external power supply. The hot nozzle wiring 4 is used to start the hot nozzle heater 1.

[0036] Furthermore, a wiring groove 5 is provided at the end of the mounting sleeve 6 that is not connected to the hot nozzle body 8. The end of the hot nozzle wiring 4 that is away from the hot nozzle heater 1 passes through the wiring groove 5 outside the mounting sleeve 6. The wiring groove 5 is used to install the hot nozzle wiring 4.

[0037] Furthermore, a fixing protrusion 10 is fixedly connected to the open end of the nozzle core 9. One end of the nozzle core 9 connected to the fixing protrusion 10 is connected to the dispensing end of the hot nozzle body 8. The fixing protrusion 10 is used to connect the hot nozzle body 8 and the nozzle core 9. The nozzle core 9 is made of wear-resistant material.

[0038] Furthermore, the nozzle core 9 has two glue inlet cuts 11 at one end away from the fixed protrusion 10. The glue inlet cuts 11 are symmetrical about the nozzle core 9 on both sides. The glue inlet cuts 11 do not penetrate into the interior of the nozzle core 9. Each of the two glue inlet cuts 11 has a glue inlet hole 12 on the side parallel to the opening end of the nozzle core 9. The glue inlet hole 12 extends into the interior of the nozzle core 9 and penetrates into the interior. The glue inlet cuts 11 are used to open the glue inlet hole 12, and the glue inlet hole 12 is used to dispense glue.

[0039] Furthermore, the nozzle core 9 has two inlet ramps 2 at the end opposite to the fixed protrusion 10. The two inlet ramps 2 correspond to the inlet cut 11. The side of the inlet ramp 2 away from the inlet cut 11 is inclined towards the center of the nozzle core 9. The inlet ramp 2 facilitates the flow of plastic raw materials.

[0040] Furthermore, the hot nozzle body 8 has a fixing groove 13 at the dispensing end, the nozzle core 9 has a fixing protrusion 10 at one end inserted into the fixing groove 13, the sprue 3 is inserted into the fixing groove 13 and sleeved on the outside of the nozzle core 9, the fixing protrusion 10 is engaged between the sprue 3 and the opposite side of the opening of the fixing groove 13, the fixing groove 13 is used to connect the nozzle core 9, and the sprue 3 is used to fix the nozzle core 9.

[0041] Structural Description:

[0042] Hot nozzle heater 1: Located on the outside of the hot nozzle body 8, it is a strip or ring structure wrapped around the hot nozzle body 8. It is powered by an external power source through the hot nozzle wiring 4 to heat and keep the plastic material inside the hot nozzle body 8 in a molten state and prevent solidification and blockage.

[0043] Inlet ramp 2: Located at one end of the nozzle core 9 away from the fixed protrusion 10, it consists of two inclined planes corresponding to the inlet cut 11. The side away from the inlet cut 11 is inclined towards the center of the nozzle core 9. It is used to guide the plastic raw material to flow out faster along the ramp, form a stable laminar flow, and avoid uneven filling and temperature deviation.

[0044] Sprue 3: It is set inside the hot nozzle body 8 and has a cylindrical structure. It is inserted between the nozzle core 9 and the hot nozzle body 8, and is sleeved on the outside of the nozzle core 9 to fix the nozzle core 9 to the glue outlet end of the hot nozzle body 8, ensuring that the nozzle core 9 and the hot nozzle body 8 are coaxially fixed.

[0045] Hot nozzle wiring 4: A linear conductor connecting one end of the hot nozzle heater 1 inside the mounting sleeve 6 to an external power source, used to start the hot nozzle heater 1 and transmit electrical energy to achieve the heating function;

[0046] Wiring groove 5: A long strip-shaped groove is opened at the end of the mounting sleeve 6 that is not connected to the hot nozzle body 8. The end of the hot nozzle wiring 4 that is away from the hot nozzle heater 1 extends through the wiring groove 5 to the outside of the mounting sleeve 6 for installing the hot nozzle wiring 4, so as to realize the independent layout of the circuit and avoid squeezing affecting the heating stability.

[0047] Mounting sleeve 6: A tubular structure fixedly connected to the outside of the glue inlet end of the hot nozzle body 8, sleeved on the outside of the hot nozzle body 8. One end of the hot nozzle heater 1 is snapped between the mounting sleeve 6 and the hot nozzle body 8, used to install the hot nozzle heater 1 and enhance the overall rigidity of the assembly.

[0048] Hot runner 7: A through channel opened in the hot nozzle body 8, which transports plastic raw materials inside, allowing the raw materials to flow from the inlet end of the hot nozzle body 8 to the outlet end of the nozzle core 9.

[0049] Hot nozzle body 8: The main body is a tubular structure with an inlet and outlet end respectively. A hot runner 7 is opened inside, and a hot nozzle heater 1 is set on the outside. The outlet end is equipped with a nozzle core 9 and a gate 3, which serves as the basic frame for integrating various structures.

[0050] Nozzle core 9: A cylindrical structure located at the dispensing end of the hot nozzle body 8, with an opening at one end and a hollow internal structure corresponding to the hot runner 7. The end opposite to the opening end is provided with a dispensing slit 11, a dispensing hole 12 and a dispensing inclined surface 2, which are used to control the plastic flow, distribute the plastic flow rate and adjust the plastic temperature.

[0051] Fixed protrusion 10: A ring-shaped or block-shaped protrusion fixedly connected to the opening end of the nozzle core 9. One end of the nozzle core 9 connected to the fixed protrusion 10 is connected to the glue outlet end of the hot nozzle body 8, and is snapped between the gate 3 and the opposite side of the opening of the fixing groove 13 of the hot nozzle body 8, for connecting the hot nozzle body 8 and the nozzle core 9.

[0052] Glue inlet 11: The grooves on both sides of the nozzle core 9 opposite to the fixed protrusion 10 are symmetrical about the nozzle core 9 and do not penetrate into the interior of the nozzle core 9. They are used to open the glue inlet hole 12 to help form the glue outlet channel.

[0053] Inlet hole 12: A channel is opened on the nozzle core 9 on the side parallel to the inlet cut 11 and the opening end. It extends into the interior of the nozzle core 9 and is narrow in diameter. It is used for discharging glue. By limiting the flow rate of raw materials and increasing the flow rate, the residence time in the mold is reduced and the risk of shrinkage is reduced.

[0054] Fixed groove 13: An annular groove or recess is formed at the dispensing end of the hot nozzle body 8. One end of the nozzle core 9 connected to the fixed protrusion 10 is inserted into the fixed groove 13. The sprue 3 is inserted into the fixed groove 13 and sleeved on the outside of the nozzle core 9. It is used to connect the nozzle core 9 and provide fixed support for the sprue 3.

[0055] Working Principle: A hot runner 7 is formed inside the hot nozzle body 8. Plastic raw material enters the hot runner 7 from the inlet end and is continuously conveyed by an external feeding system. The hot nozzle heater 1 is wrapped around the outside of the hot nozzle body 8, with one end connected to the mounting sleeve 6 between the mounting sleeve 6 and the hot nozzle body 8. The hot nozzle heater 1 is connected to an external power source through the hot nozzle wiring 4 to continuously heat and maintain the temperature of the raw material in the hot runner 7, keeping it in a molten state and preventing solidification and blockage. The wiring groove 5 is used to guide the hot nozzle wiring 4 out, achieving independent wiring layout and avoiding extrusion that affects heating stability. The molten raw material flows into the hollow internal structure of the nozzle core 9 through the hot runner 7. The nozzle core 9 has symmetrical inlet cuts 11 at the end away from the opening end, and inlet holes 12 are formed on the surface parallel to the opening end. The inlet holes 12 restrict the raw material flow through the narrow diameter, increasing the flow rate, reducing the residence time in the mold, and reducing the risk of shrinkage. The inlet slope 2 corresponding to the inlet cut 11 guides the raw material to flow out faster along the slope, forming a stable laminar flow and avoiding uneven filling caused by turbulence. Temperature deviation is addressed by inserting the sprue 3 into the fixing groove 13 at the outlet end of the hot nozzle body 8 and sleeved on the outside of the nozzle core 9. The fixing protrusion 10 at the opening end of the nozzle core 9 is engaged between the sprue 3 and the opening end of the fixing groove 13, ensuring the coaxial fixation of the nozzle core 9 and the hot nozzle body 8 and preventing positional displacement caused by injection vibration. In addition to positioning the hot nozzle heater 1, the mounting sleeve 6 enhances the overall rigidity of the component through its fixed connection with the hot nozzle body 8, ensuring the stable coordination of the heating system and the runner system. The narrow opening structure of the injection hole 12 restricts the flow rate, reduces the heat capacity of the raw material in the mold, and accelerates cooling and solidification. The injection slope 2 guides the raw material to fill evenly, reducing shrinkage stress concentration. The cylindrical structure of the nozzle core 9 and the mechanical support of the fixing protrusion 10 improve the end erosion resistance and extend the service life. The insertion and engagement of the sprue 3 and the fixing groove 13, and the snap-fit ​​design of the fixing protrusion 10, simplify the disassembly and assembly process of the nozzle core 9. The structural design of the mounting sleeve 6 and the wiring groove 5 enables independent installation and maintenance of the heating circuit, avoiding interference with the runner system.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A special injection molding component for easily shrinkable plastic products with a non-circular nozzle core, comprising a hot nozzle body (8), characterized in that: Also includes: A hot runner (7) is formed inside the hot nozzle body (8) to transport plastic raw materials; The hot nozzle heater (1) located on the outside of the hot nozzle body (8) heats and keeps the plastic material inside the hot nozzle body (8) warm; The nozzle core (9) is located at the dispensing end of the hot nozzle body (8). The nozzle core (9) is a cylindrical structure with an opening at one end. The hot flow channel (7) corresponds to the hollow structure inside the nozzle core (9). The nozzle core (9) is used to control the plastic flow, distribute the plastic flow rate, and adjust the plastic temperature. A gate valve (3) is installed inside the hot nozzle body (8). The gate valve (3) is inserted between the nozzle core (9) and the hot nozzle body (8) to fix the nozzle core (9) to the glue outlet end of the hot nozzle body (8).

2. The special injection molding component for easily shrinkable plastic products with a shaped nozzle core according to claim 1, characterized in that: The hot nozzle body (8) has a fixed connection to an installation sleeve (6) at one end, which is located on the outside of the hot nozzle body (8). One end of the hot nozzle heater (1) is snapped between the installation sleeve (6) and the hot nozzle body (8).

3. The special injection molding component for easily shrinkable plastic products with a shaped nozzle core according to claim 2, characterized in that: The hot nozzle heater (1) has a hot nozzle wiring (4) connected to one end inside the mounting sleeve (6), and the other end of the hot nozzle wiring (4) is connected to an external power supply wiring.

4. The special injection molding component for easily shrinkable plastic products with a shaped nozzle core according to claim 3, characterized in that: The mounting sleeve (6) has a wiring groove (5) at one end that is not connected to the hot nozzle body (8), and the end of the hot nozzle wiring (4) that is away from the hot nozzle heater (1) passes through the wiring groove (5) outside the mounting sleeve (6).

5. The special injection molding component for easily shrinkable plastic products with a shaped nozzle core according to claim 1, characterized in that: The nozzle core (9) has a fixed protrusion (10) fixedly connected to its open end, and the end of the nozzle core (9) connected to the fixed protrusion (10) is connected to the dispensing end of the hot nozzle body (8).

6. A special injection molding component for easily shrinkable plastic products with a shaped nozzle core according to claim 5, characterized in that: The nozzle (9) has two glue inlet cuts (11) at one end away from the fixed protrusion (10). The glue inlet cuts (11) are symmetrical about the nozzle (9) on both sides. The glue inlet cuts (11) do not penetrate into the interior of the nozzle (9). The two glue inlet cuts (11) are provided with glue inlet holes (12) on the side parallel to the opening end of the nozzle (9). The glue inlet holes (12) extend into the interior of the nozzle (9).

7. A special injection molding component for easily shrinkable plastic products with a shaped nozzle core according to claim 6, characterized in that: The nozzle (9) has two glue inlet ramps (2) at one end away from the fixed protrusion (10). The two glue inlet ramps (2) correspond to the glue inlet cut (11). The side of the glue inlet ramp (2) away from the glue inlet cut (11) is inclined towards the center of the nozzle (9).

8. A special injection molding component for easily shrinkable plastic products with a shaped nozzle core according to claim 5, characterized in that: The hot nozzle body (8) has a fixed groove (13) at the glue outlet end. The nozzle core (9) is connected to a fixed protrusion (10) at one end, which is inserted into the fixed groove (13). The sprue (3) is inserted into the fixed groove (13) and sleeved on the outside of the nozzle core (9). The fixed protrusion (10) is engaged between the sprue (3) and the opposite side of the opening of the fixed groove (13).

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