Whole-cycle exhaust structure

Abstract

The invention provides a whole-cycle exhaust structure which is arranged on a mold core and comprises a first exhaust groove, the first exhaust groove surrounds the whole circumference of a cavity and communicates with one end of at least one second exhaust groove, and the other end of each second exhaust groove communicates with an air entraining groove; and the air entraining groove is used for guiding trapped air in the cavity to be discharged. The mold has the beneficial effects that trapped air generated in the mold cavity in the injection molding process can be guided into the air entraining groove from the mold cavity through the first air exhaust groove and the second air exhaust groove in sequence to be exhausted out of the mold cavity, the product is prevented from being subjected to reverse package air trapping and other defects, the mold is not limited by the air trapping position, the applicability is high, and the product yield is increased.

Description

[Technical Field]

[0001] This invention relates to the field of venting technology for injection molds, and in particular to a circumferential venting structure. [Background Technology]

[0002] Products formed by injection molding two different materials are called two-color products. Two-color products can be formed by combining soft rubber and hard rubber. Figure 1-2 A structural schematic diagram of a two-color product 1 is shown. Figure 3 A cross-sectional view of product 1 is shown. The product consists of two parts: hard plastic 11 and soft plastic 10. There are multiple soft plastic injection points 12 on the hard plastic 11 part. After the injection points 12 are cured, they also form soft plastic 10. Due to processing requirements, the soft plastic 10 and hard plastic 11 cannot be separated beyond the C-corner surface. That is, the soft plastic 10 needs to wrap the hard plastic 11. Therefore, the two ends of the soft plastic 10 are thicker. During the injection molding process, it is easy to cause poor air entrapment due to reverse wrapping, which affects the appearance quality of the product. The existing solution is to set an venting groove between every two injection points on the mold core. However, during the injection molding process, the air entrapment position cannot be completely determined. Sometimes, the air entrapment position changes, causing poor venting.

[0003] In view of this, the present invention provides a circumferential exhaust structure to solve the above problems. [Summary of the Invention]

[0004] The technical problem to be solved by this invention is: in order to solve the problem that during the injection molding process, when the product has a large plastic thickness, air trapping is easy to occur, resulting in product defects, and the existing venting structure cannot ensure that the trapped air is completely discharged, this invention provides a circumferential venting structure to solve the above problems.

[0005] The solution to the technical problem of this invention is: a circumferential venting structure, disposed on the mold core, comprising:

[0006] The first venting groove is arranged around the entire circumference of the cavity. The first venting groove is connected to one end of at least one second venting groove. The other end of each second venting groove is connected to an air duct. The air duct is used to guide the trapped air in the cavity to be discharged.

[0007] Preferably, the first venting groove and the second venting groove have the same depth and are less than the depth of the air intake groove, which facilitates the discharge of trapped air in the cavity.

[0008] Preferably, the second venting grooves are distributed between each glue inlet point, and the interval between every two second venting grooves is 2-3 times the width of the second venting groove. This allows sufficient contact surface to be reserved between every two second venting grooves, thus avoiding burr defects in the product.

[0009] The beneficial effects of this invention are that by applying the circumferential venting structure of this invention, the trapped air generated in the cavity during the injection molding process can be guided from the cavity through the first venting groove and the second venting groove to the air intake groove and discharged from the cavity, avoiding defects such as trapped air backflow in the product. Moreover, this invention is not limited by the location of trapped air, has strong applicability, and improves product yield.

Brief Description of the Drawings

[0010] Figure 1 This is a structural diagram of a product from one angle.

[0011] Figure 2 This is a structural diagram of a product from another angle.

[0012] Figure 3 This is a cross-sectional view of the product.

[0013] Figure 4 This is a schematic diagram of a circumferential exhaust structure according to the present invention.

[0014] Figure 5 yes Figure 4 Enlarged diagram of point A in the middle. [Specific implementation method]

[0015] To further illustrate the technical means and effects of the present invention, the following detailed description is provided in conjunction with the embodiments of the present invention and their accompanying drawings.

[0016] This invention provides a circumferential venting structure, disposed on the mold core 2, comprising:

[0017] A first venting groove 21 is arranged around the entire circumference of the cavity 20. The first venting groove 21 is connected to one end of at least one second venting groove 22. The other end of each second venting groove 22 is connected to an air-guiding groove 23, which is used to guide the trapped air in the cavity 20 to be discharged.

[0018] The first exhaust groove 21 and the second exhaust groove 22 have the same depth and are less than the depth of the air intake groove 23, which facilitates the discharge of trapped air in the cavity 20.

[0019] The second venting grooves 22 are distributed between each glue inlet 12. The interval between each two second venting grooves 22 is 2-3 times the width of the second venting groove 22. This allows sufficient contact surface to be reserved between each two second venting grooves 22 to avoid burrs on the product 1.

[0020] In a preferred embodiment, the depth of the first venting groove 21 and the second venting groove 22 is 0.015 mm, the depth of the air intake groove 23 is 0.2 mm, the width of the second venting groove 22 is 6 mm, and the interval between each two second venting grooves 22 is 12-18 mm. During the injection molding process, molten plastic is injected from each injection point 12, and the gas in the cavity 20 is discharged sequentially through the first venting groove 21, the second venting groove 22, and the air intake groove 23, so that the product 1 has a good appearance.

[0021] The beneficial effects of the present invention are that by applying the whole-circumference venting structure of the present invention, the trapped air generated in the cavity 20 during the injection molding process can be guided from the cavity 20 through the first venting groove 21 and the second venting groove 22 to the air intake groove 23 and discharged from the cavity 20, avoiding defects such as reverse entrapment of air in the product 1. Moreover, the present invention is not limited by the location of trapped air, has strong applicability, and improves product yield.

[0022] It should be noted that the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made by those skilled in the art to the above embodiments based on the technical solutions of the present invention shall fall within the protection scope of the present invention.

Claims

1. A circumferential venting structure, disposed on a mold core, characterized in that, include: The first venting groove is arranged around the entire circumference of the cavity. The first venting groove is connected to one end of at least one second venting groove. The other end of each second venting groove is connected to an air duct. The air duct is used to guide the trapped air in the cavity to be discharged.

2. The circumferential exhaust structure as described in claim 1, characterized in that: The first venting groove and the second venting groove have the same depth and are less than the depth of the air intake groove, which facilitates the discharge of trapped air in the cavity.

3. The circumferential exhaust structure as described in claim 1, characterized in that: The second venting grooves are distributed between each glue inlet point, and the interval between every two second venting grooves is 2-3 times the width of the second venting groove. This allows for sufficient contact surface between every two second venting grooves, preventing burrs from forming on the product.

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