Adhesive mouth structure, injection molding device and injection molding process

Abstract

The embodiments of the present disclosure disclose a glue outlet structure, an injection molding device and an injection molding process. The glue outlet structure comprises a main body, the main body has a glue inlet end and a glue outlet end, and the main body is in the shape of a neck along the direction from the glue inlet end to the glue outlet end. The glue outlet end has at least two glue outlet openings, and any two adjacent glue outlet openings form a hollow area. The length of the hollow area is not less than the length of the glue outlet opening along the cross section of the glue outlet end. In this way, the internal stress of the glue outlet plastic can be redistributed by using multiple glue outlet openings and hollow areas, which helps to reduce injection molding defects caused by uneven internal stress of the glue outlet, such as product sidewall deformation, excessive plastic residue, etc. when the glue outlet plastic is broken, and further improves the molding quality and performance of the product.

Description

Gating structure, injection molding equipment and injection molding process Technical Field

[0001] This invention relates to the field of injection molding equipment technology, and more specifically, to a gate structure, injection molding device, and injection molding process. Background Technology

[0002] In injection molding, the gate structure design has a crucial impact on product molding quality and production efficiency. Traditional gate structures often employ a single gate design. While this design can meet basic injection molding requirements to a certain extent, some problems have gradually emerged in practical applications.

[0003] For example, a single nozzle design can cause the product's sidewalls to stretch and deform when the nozzle separates from the product after injection molding, resulting in a large amount of plastic residue at the nozzle end, which affects the product's appearance quality. Furthermore, due to these defects, the size of the single nozzle must be designed within a certain range, which is very limiting and not conducive to product injection molding. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a novel gate structure, injection molding device and injection molding process.

[0005] According to one aspect of the present invention, a joint structure is provided.

[0006] The gate structure includes:

[0007] The main body has an inlet end and an outlet end, and the main body is constricted in the direction from the inlet end to the outlet end.

[0008] The dispensing end has at least two dispensing ports, and a hollow area is formed between any two adjacent dispensing ports. The length of the hollow area along the cross-section of the dispensing end is not less than the length of the dispensing port.

[0009] Optionally, along the direction from the glue inlet end to the glue outlet end, the ratio of the depth of the hollowed-out area to the length of the hollowed-out area ranges from 1:1 to 2:1.

[0010] Optionally, along the direction from the glue inlet end to the glue outlet end, the ratio of the depth of the hollowed-out area to the length of the hollowed-out area is 1.5:1.

[0011] Optionally, the plurality of dispensing ports are arranged side by side; or, the plurality of dispensing ports are arranged in an array.

[0012] Optionally, the multiple dispensing nozzles are of equal size.

[0013] Optionally, the dispensing end has two dispensing ports, and the two dispensing ports and the hollowed-out area form a U-shaped structure.

[0014] Optionally, the thickness of the U-shaped structure gradually decreases along the direction from the glue inlet end to the glue outlet end.

[0015] According to another aspect of the present invention, an injection molding apparatus is provided, comprising a body and the aforementioned gate structure, the gate structure being connected to an end of the body.

[0016] Optionally, the body has a first flow channel, and the nozzle structure has a second flow channel, the second flow channel including at least two branch channels, each of the branch channels communicating with the first flow channel.

[0017] According to another aspect of the present invention, an injection molding process using the aforementioned injection molding apparatus is provided, comprising:

[0018] Open the mold, place the rubber material and the mold containing the injection molding device into the injection molding machine, and adjust the injection molding machine parameters based on the mold structure;

[0019] Injection molding involves heating, melting, and compressing the rubber compound, then injecting the resulting molten rubber compound into the mold cavity through the injection runner and the outlet.

[0020] Demolding: After the rubber material cools and solidifies, the ejector pin breaks the outlet, separating the outlet from the product, and the injection-molded product is obtained.

[0021] One technical advantage of the embodiments disclosed herein is that:

[0022] The gate structure includes a main body with an inlet end and an outlet end. The main body is constricted along the direction from the inlet end to the outlet end. The outlet end has at least two outlets, with a hollow area formed between any two adjacent outlets. The length of the hollow area along the cross-section of the outlet end is not less than the length of the outlet. This design, utilizing multiple outlets and hollow areas, allows for the redistribution of internal stress in the plastic at the outlet end. This helps reduce injection molding defects caused by uneven internal stress in the molten plastic at the outlet end, such as product sidewall deformation and excessive plastic residue when the plastic at the outlet end breaks, further improving the molding quality and performance of the product.

[0023] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0024] The accompanying drawings, which form part of this specification, illustrate embodiments of the invention and, together with the specification, serve to explain the principles of the invention.

[0025] Figure 1 is a schematic diagram of a glue joint structure according to an embodiment of the present disclosure;

[0026] Figure 2 is another schematic diagram of a glue joint structure according to an embodiment of the present disclosure;

[0027] Figure 3 is a schematic diagram of an injection molding apparatus according to an embodiment of the present disclosure;

[0028] Figure 4 is a cross-sectional view at point AA in Figure 3;

[0029] Figure 5 is an equivalent stress simulation diagram of the existing glue joint structure;

[0030] Figure 6 is an equivalent stress simulation diagram of the glue joint structure according to an embodiment of this disclosure.

[0031] Explanation of reference numerals in the attached figures:

[0032] 001. Product;

[0033] 1. Main body; 11. Outlet; 12. Hollowed-out area; 2. Mold body; 21. First runner; 3. Ejector pin. Detailed Implementation

[0034] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0035] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0036] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0037] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0039] This invention provides a gate structure that can be applied to an injection molding device or an injection mold. During the injection molding process, molten rubber can enter the inlet end of the gate structure through the first flow channel 21 of the injection molding device; then, the rubber is guided along the gate structure and fills the mold cavity through the outlet end.

[0040] As shown in Figures 1 and 2, the glue joint structure provided in this embodiment of the invention includes:

[0041] The main body 1 has an inlet end and an outlet end, and the main body 1 is constricted in the direction from the inlet end to the outlet end.

[0042] The dispensing end has at least two dispensing ports 11, and a hollow area 12 is formed between any two adjacent dispensing ports 11. The length of the hollow area 12 along the cross-section of the dispensing end is not less than the length of the dispensing port 11.

[0043] Specifically, the main body 1 has an inlet end and an outlet end, and there is an injection channel between the inlet end and the outlet end. The injection channel contains adhesive material to facilitate the injection molding process.

[0044] In this design, the main body 1 features a tapered design from the inlet to the outlet, meaning it gradually narrows. This helps guide the material to flow more evenly during injection molding, increasing the shear rate of the plastic flow within the nozzle. This improves injection molding efficiency, enhances product appearance, and ultimately ensures product quality and increases the yield rate of injection-molded products. Furthermore, the tapered design of the main body 1 reduces material residue at the outlet, eliminating the need for a separate material removal process and saving on injection molding steps and costs.

[0045] In addition, the constricted design of the main body 1 makes the size of the dispensing end smaller, which is convenient for adapting to smaller products 001 and also for adapting to complex injection molding requirements.

[0046] The constricted design of the main body 1 can also reduce the overall size of the gate structure, which facilitates the miniaturization of injection molding devices with this gate structure.

[0047] The constricted design of the main body 1 can be achieved through a molding die or an adjustable mechanism such as a threaded adjusting ring, facilitating adjustments based on different injection molding requirements and mold dimensions. Furthermore, the number and arrangement of the ejector ports 11 can be customized to meet a wider range of injection molding applications.

[0048] As shown in Figures 1 and 2, at the dispensing end, this embodiment of the invention is provided with at least two dispensing ports 11. These dispensing ports 11 can be evenly distributed to ensure that the adhesive can flow out from multiple dispensing ports 11 simultaneously, thus balancing the distribution and flow of the adhesive during the injection molding process; these dispensing ports 11 can also be non-uniformly distributed to adapt to complex injection molding requirements, both of which help to shorten the injection molding cycle and improve production efficiency.

[0049] The design incorporates a hollowed-out area 12 between any two adjacent outlets 11, meaning that the outlets 11 are spaced apart. This reduces the weight of the outlet structure and enhances the dispersion and uniformity of the adhesive during dispensing, thereby increasing the shear stress of a single outlet 11. This facilitates the breakage of the adhesive after injection molding and reduces residual material, eliminating the need for a separate adhesive removal process and saving on injection molding process and costs.

[0050] Figure 5 shows the shear stress of the gate structure using the prior art, and Figure 6 shows the shear stress of the gate structure using an embodiment of the present invention. It can be clearly seen that the shear stress in Figure 6 is greater than that in Figure 5. This means that the gate structure using the embodiment of the present invention can reduce the difficulty of material breakage, facilitating material breakage after injection molding, thereby improving the convenience and efficiency of the injection molding process.

[0051] Furthermore, the hollowed-out area 12 creates a split-type outlet 11 at the glue outlet end, which reduces the continuous contact area between the glue outlet end and the product 001. This reduces the adhesion between the glue and the product 001, thereby reducing the risk of deformation or cracking of the sidewall of the product 001 when the glue breaks. In turn, this improves the molding quality of the product 001 and increases the yield of injection molded products.

[0052] In addition, the design of multiple outlets 11 and hollow areas 12 makes the pressure distribution during the injection molding process more uniform, which helps to reduce injection molding defects caused by uneven pressure, such as shrinkage cavities and bubbles, further improving the molding quality of product 001 and increasing the yield of injection molded products.

[0053] Furthermore, the split-type ejector 11, due to its greater internal stress and smaller residual plastic after breakage, has fewer limitations in size design, thus allowing for a larger size to meet more injection molding needs. Compared to the existing one-piece ejector 11, the split-type ejector 11 design can increase the overall size of the ejector end for easier injection molding, while utilizing the hollow area 12 to avoid risks such as sidewall deformation, cracking, or residual material in the product 001 when the plastic breaks. It also facilitates the improvement of the molding quality of the product 001 and increases the yield of injection-molded products.

[0054] As shown in Figures 1 and 2, the length of the hollowed-out area 12 along the cross-section of the dispensing end is greater than or equal to the length of the dispensing port 11. This ensures that the hollowed-out area has sufficient area to reduce the accumulation and retention of adhesive material near the dispensing port 11, thereby reducing mold wear and clogging risks, extending mold life, and reducing maintenance costs. It also helps maintain the continuity of adhesive flow, reducing problems such as poor flow or uneven pressure caused by accumulation.

[0055] In addition, a certain size of hollow area can help improve the heat dissipation efficiency of the mold, reduce temperature fluctuations during the injection molding process, shorten the product injection molding cycle to a certain extent, and improve the stability and reliability of the product.

[0056] The main body 1 and the outlet 11 can be made of high-temperature resistant, high-strength, and easy-to-process materials, such as stainless steel or special alloys, to ensure the stability and durability of the outlet structure during the injection molding process. During processing, precision machining or laser cutting technology can be used to ensure the dimensional accuracy and shape consistency of the outlet 11 and the hollowed-out area 12.

[0057] Optionally, along the direction from the glue inlet end to the glue outlet end, the ratio of the depth of the hollowed-out area 12 to the length of the hollowed-out area 12 ranges from 1:1 to 2:1.

[0058] Specifically, when the ratio of the depth to the length of the hollow area 12 is between 1:1 and 2:1, the hollow area 12 can provide more flow space for the rubber material, reduce problems such as poor flow or uneven pressure caused by space limitations, facilitate the realization of the injection molding process, and also help the rubber material to fill the mold cavity more quickly. Especially in complex or deep cavity molds, it can not only shorten the injection molding cycle, but also improve the filling quality and consistency of the product 001.

[0059] Furthermore, setting the depth-to-length ratio of the hollow area 12 to be between 1:1 and 2:1 allows for more effective heat transfer to the air by utilizing the depth of the hollow area 12, thereby reducing the mold temperature and minimizing problems such as material degradation and product deformation caused by excessive temperature. This helps to reduce the temperature gradient inside the mold, thus reducing injection molding defects caused by uneven temperature.

[0060] In addition, by rationally designing the depth-to-length ratio of the hollow area 12, it can be ensured that the hollow area 12 is not too fragile, which helps to maintain the overall structural strength of the mold and extend the service life of the mold. At the same time, it can also reduce the size of the gate structure, making it easier to adapt to smaller products 001 and complex injection molding requirements.

[0061] Optionally, along the direction from the injection end to the discharge end, the ratio of the depth of the hollow area 12 to the length of the hollow area 12 is 1.5:1, that is, the depth of the hollow area 12 is 1.5 times the length of the hollow area 12. This can maintain the overall structural strength of the mold and extend the service life of the mold, while also reducing the size of the gate structure, making it easier to adapt to smaller products 001 and complex injection molding requirements.

[0062] Optionally, the plurality of dispensing ports 11 are arranged side by side; or, the plurality of dispensing ports 11 are arranged in an array.

[0063] In one embodiment, multiple outlets 11 can be arranged side by side to ensure that the adhesive can flow out from multiple outlets 11 simultaneously during the injection molding process. This helps to reduce problems such as adhesive accumulation and uneven flow caused by single-point dispensing, thereby improving the filling quality and consistency of product 001.

[0064] In another embodiment, multiple dispensing ports 11 can be arranged in an array, which can not only achieve uniform distribution of the dispensing end of the adhesive, but also achieve more precise control of the adhesive flow in terms of depth. This is suitable for complex or large molds and can ensure that the adhesive is fully and uniformly filled in the mold cavity.

[0065] The multiple outlets 11 can shorten the injection cycle, increase the shear rate of plastic flow, and improve injection efficiency. Furthermore, the multiple outlets 11 can guide the flow of the plastic material, helping to reduce injection defects such as shrinkage cavities, bubbles, and weld lines caused by uneven material flow, thereby improving the molding quality of product 001.

[0066] Optionally, the plurality of dispensing ports 11 are of equal size.

[0067] Specifically, setting multiple outlets 11 of equal size can, on the one hand, balance the distribution and flow of the material during the injection molding process, ensuring that the amount of material dispensed from each outlet 11 is basically the same, thereby improving the uniformity and controllability of the injection structure; on the other hand, it also facilitates the convenient molding of multiple outlets 11, reduces the difficulty of mold opening and molding efficiency, and can also improve the symmetry and stability of the gate structure.

[0068] Optionally, the dispensing end has two dispensing ports 11, and the two dispensing ports 11 and the hollowed-out area 12 form a U-shaped structure.

[0069] As shown in Figures 1 and 2, the U-shaped structure formed by the two outlets 11 and the hollowed-out area 12 guides the material to flow along the U-shaped path, helping to reduce resistance and turbulence during the flow process, achieving smoother and more uniform filling. This ensures more consistent molding quality for products 001 in the same batch and reduces the defect rate. Furthermore, the U-shaped design helps balance the pressure distribution during injection molding, allowing the material to more easily reach all corners of the mold cavity, reducing incomplete filling or injection defects caused by dead zones.

[0070] The two outlets 11 on both sides of the U-shaped structure can discharge glue simultaneously, which can improve injection efficiency and shorten the injection cycle. The synchronous discharge of the two outlets 11 can also ensure more uniform pressure in the mold cavity and reduce injection defects caused by uneven pressure.

[0071] In addition, the U-shaped structure design helps reduce the accumulation and retention of adhesive in the mold, thereby reducing the risk of mold wear and making it easier to remove residues, thus extending the service life of the mold.

[0072] Optionally, the thickness of the U-shaped structure gradually decreases along the direction from the glue inlet end to the glue outlet end.

[0073] Specifically, the gradually decreasing thickness of the U-shaped structure serves two purposes. First, it allows the U-shaped structure to guide the material to flow more evenly during injection molding, reducing pressure loss and material retention, thereby improving injection molding efficiency and product quality. It also results in a smaller ejection end size, facilitating the production of smaller products and addressing complex injection molding requirements. Second, the gradually decreasing thickness of the U-shaped structure also leads to a smaller ejection end size, increasing shear stress at the ejection end, facilitating material breakage after injection molding, and reducing residual material.

[0074] This invention also provides an injection molding apparatus, including a mold body 2 and the aforementioned gate structure, wherein the gate structure is connected to the end of the mold body 2.

[0075] As shown in Figures 3 and 4, the mold body 2 of the injection molding device is typically made of a high-strength, high-temperature resistant material. The mold body 2 has a first flow channel 21 inside, which is used to contain molten rubber material and inject it into the mold cavity through the injection molding process.

[0076] The gate structure is connected to the end of the mold body 2, so that the inlet end of the gate structure is connected to the first flow channel 21 of the mold body 2 to receive molten plastic material from the mold body 2. The outlet end of the gate structure has at least two outlets 11, and there is a hollow area 12 between two adjacent outlets 11, which optimizes the flow path of the plastic material and improves injection molding efficiency and quality. In addition, the hollow area 12 can also reduce the resistance and accumulation of plastic material during the flow process, while improving heat dissipation efficiency and extending the service life of the injection molding device.

[0077] During the injection molding process, the molten rubber enters the inlet end of the gate structure through the first flow channel 21 of the mold body 2. Then, guided by the hollow area 12, the rubber fills the molding cavity of the mold through multiple outlets 11, thereby optimizing the flow path of the rubber, reducing flow resistance and accumulation, and improving injection molding efficiency and quality.

[0078] Optionally, the mold body 2 has a first flow channel 21, and the gate structure has a second flow channel, the second flow channel including at least two branch channels, each of the branch channels communicating with the first flow channel 21.

[0079] As shown in Figures 3 and 4, molten rubber flows in the first flow channel 21 inside the mold body 2. Each outlet 11 of the injection gate structure corresponds to a branch channel, and each branch channel is connected to the first flow channel 21, so that the rubber can be dispersed into different branch channels through the first flow channel 21. Thus, multiple outlets 11 can be used to realize the injection molding process, which can improve the injection molding efficiency and balance the distribution and flow of rubber during the injection molding process.

[0080] This invention also provides an injection molding process using the above-described injection molding apparatus, comprising:

[0081] S1. Open the mold, place the rubber material and injection molding device into the injection molding machine, and adjust the position and parameters of the injection molding device;

[0082] S2. Injection molding: Heat and melt the rubber material and compress it. The resulting molten rubber material is injected into the mold cavity through the injection channel and the outlet 11.

[0083] S3. Demolding: After the rubber material cools and solidifies, the ejector pin 3 pushes the rubber outlet to separate the outlet 11 from the product 001, and the injection-molded product 001 is obtained.

[0084] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0085] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A type of joint structure, characterized in that, include: The main body (1) has an inlet end and an outlet end. Along the direction from the inlet end to the outlet end, the main body (1) is constricted. The outlet end has at least two outlets (11). A hollow area (12) is formed between any two adjacent outlets (11). Along the cross-section of the outlet end, the length of the hollow area (12) is not less than the length of the outlet (11). The outlet end has two outlets (11). The two outlets (11) and the hollow area (12) form a U-shaped structure. Along the direction from the inlet end to the outlet end, the thickness of the U-shaped structure gradually decreases.

2. The joint structure according to claim 1, characterized in that, Along the direction from the glue inlet end to the glue outlet end, the ratio of the depth of the hollow area (12) to the length of the hollow area (12) ranges from 1:1 to 2:

1.

3. The joint structure according to claim 2, characterized in that, Along the direction from the glue inlet end to the glue outlet end, the ratio of the depth of the hollow area (12) to the length of the hollow area (12) is 1.5:

1.

4. The joint structure according to claim 1, characterized in that, The plurality of dispensing ports (11) are arranged side by side; or the plurality of dispensing ports (11) are arranged in an array.

5. The joint structure according to claim 4, characterized in that, The multiple dispensing ports (11) are of equal size.

6. An injection molding device, characterized in that, It includes a mold body (2) and a gate structure as described in any one of claims 1 to 5, the gate structure being connected to an end of the mold body (2).

7. The injection molding apparatus according to claim 6, characterized in that, The mold body (2) has a first flow channel (21) and the gate structure has a second flow channel. The second flow channel includes at least two branch channels, and each branch channel is connected to the first flow channel (21).

8. An injection molding process using the injection molding apparatus of claim 6 or 7, characterized in that, include: Open the mold, place the rubber material and the mold containing the injection molding device into the injection molding machine, and adjust the injection molding machine parameters in conjunction with the injection molding device; Injection molding involves heating, melting, and compressing the rubber compound. Under the action of the injection molding machine, the molten rubber compound is injected into the mold cavity through the injection runner and the outlet, filling the product with molten rubber. Demolding involves removing the rubber compound after it has cooled and solidified by ejector pins, which break the outlet and separate it from the product, resulting in the injection-molded product.

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