Disposable cup cover injection mold with pipe orifice plugging structure

Abstract

The utility model relates to the technical field of injection molds, in particular to a disposable cup cover injection mold with a pipe orifice plugging structure, which comprises an upper mold main body and a lower mold main body which are butted and matched with each other, and at least one mold core assembly is arranged between the upper mold main body and the lower mold main body. The mold core assembly comprises an upper mold core installed at the lower end of the upper mold body, at least one lower mold core installed on the lower mold body and corresponding to the upper mold core, and an annular ejector plate arranged around the lower mold core in a sleeving mode, and a plurality of evenly-distributed ejector rods are connected to the lower end of the annular ejector plate. When the mold is opened, the extension strip with a thin structure is supported through air pressure, the extension strip is prevented from being pulled and broken, long-time cooling and curing are not needed, the molding period is greatly shortened, the production efficiency is improved, and the mold can be arranged to be of a structure with a plurality of mold cavities, so that the purpose of simultaneous injection molding of a plurality of cup covers is achieved, and the production efficiency is further improved.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a disposable cup lid injection mold with a tube opening sealing structure. Background Technology

[0002] In the manufacturing of disposable cup lids, injection molds are key molding equipment. Their performance and efficiency directly affect the production quality and output of the cup lids. With the widespread application of disposable cup lids in the catering and beverage industries, higher requirements are placed on their structural design and production efficiency. Existing disposable cup lids typically feature an extension strip along the edge, with a nozzle-sealing structure formed at the end of the extension strip. This nozzle-sealing structure covers the nozzle of the cup lid and allows for flexible movement on the lid via the extension strip during use without detaching. This design makes the cup lid highly practical and convenient to use, effectively meeting users' needs for sealing and ease of use.

[0003] However, due to the thin structure of the extension strip, it is prone to tearing or even breakage during injection molding due to the tensile force of the mold. To avoid this, the cup cap inside the mold needs to be cooled and cured for a certain period of time after molding, and the mold is opened only after the extension strip has fully cured. However, this process increases the molding time of the cup cap, which not only reduces production efficiency but also increases production costs. Therefore, it is necessary to propose an improved technical solution to solve the above problems. Utility Model Content

[0004] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0005] A disposable cup lid injection mold with a pipe-sealing structure includes an upper mold body and a lower mold body that are mated together. At least one mold core assembly is provided between the upper mold body and the lower mold body. The mold core assembly includes an upper mold core installed at the lower end of the upper mold body, at least one lower mold core installed on the lower mold body and corresponding to the upper mold core, and an annular ejector plate sleeved around the lower mold core. Multiple evenly distributed ejector rods are connected to the lower end of the annular ejector plate. A movable push plate is provided inside the lower mold body. The ejector rods are fixedly connected to the push plate. A cup lid cavity is formed between the upper mold core, the lower mold core, and the annular ejector plate. A glue inlet is provided on the upper mold body. A hot runner system for connecting the glue inlet and the cup lid cavity is provided inside the upper mold body and the upper mold core.

[0006] A first hollow rod is connected between the push plate and the annular top plate. A second hollow rod that mates with the first hollow rod is embedded inside the upper mold core. A first air passage is provided on the side of both the upper mold body and the push plate. The first air passage acts on the first hollow rod and the second hollow rod. A sealing mold cavity that connects the first hollow rod and the second hollow rod is also formed between the upper mold core and the push plate. A transition mold cavity that connects the cup lid mold cavity and the sealing mold cavity is also formed between the upper mold core and the push plate.

[0007] Preferably, the upper mold body includes a panel, a hot runner plate installed at the lower end of the panel, and an upper template installed at the lower end of the hot runner plate. The injection port is located on the panel, the hot runner system is located inside the hot runner plate, the upper mold core is embedded in the upper template, and a hot nozzle connected to the hot runner system is provided between the upper mold core and the hot runner plate. The hot nozzle is connected to the cup lid mold cavity.

[0008] Preferably, the lower mold body includes a base plate and a lower template mounted on the base plate, with a movable groove provided at the lower end of the lower template, and a push plate guide connected in the movable groove.

[0009] Preferably, the lower end of the upper mold core is provided with at least one product outer contour cavity, and the lower mold core is fixedly installed with a product inner contour block that is connected to the product outer contour cavity. The product outer contour cavity, the product inner contour block and the annular top plate form a cup lid mold cavity.

[0010] Preferably, a connecting rod is fixedly installed inside the lower template, and a positioning pin is fixedly connected to the connecting rod. The lower end of the annular top plate is provided with a positioning hole that mates with the positioning pin. The annular top plate is positioned and engaged by the positioning pin and the positioning hole.

[0011] Preferably, both the first hollow rod and the second hollow rod are provided with a second air passage that extends through both ends of the rod. The first hollow rod and the second hollow rod are sealed and connected to the first air passage through the second air passage. The second air passage of the first hollow rod extends through the annular top plate, and the second air passage of the first hollow rod and the second hollow rod are provided with an expansion portion at the end that connects to the sealing mold cavity.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] The integrated design of the cup lid cavity, transition cavity, and sealing cavity ensures that the cup lid and the pipe sealing structure are molded as a single piece, improving product precision and quality stability, and reducing production costs. By utilizing the air passage structure and mold cavity design, air pressure is used to support the thinner extension strip during mold opening, preventing it from being strained or broken. No long cooling and curing time is required, which significantly shortens the molding cycle and improves production efficiency. Furthermore, the mold can be configured to have multiple cavity structures, thereby achieving the purpose of simultaneously injection molding multiple cup lids, further improving production efficiency.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of this utility model;

[0018] Figure 3 This is a partial cross-sectional structural schematic diagram of the present invention;

[0019] Figure 4 This is a schematic diagram of the mold core assembly in this utility model;

[0020] Figure 5 This is a schematic diagram of the cross-sectional structure of the mold core assembly in this utility model;

[0021] Figure 6 This is a partial structural disassembly diagram of the mold core assembly in this utility model.

[0022] The reference numerals and names in the figure are as follows:

[0023] Upper mold body 10, sprue 11, hot runner system 12, panel 13, hot runner plate 14, upper mold plate 15, hot nozzle 16, lower mold body 20, base plate 21, lower mold plate 22, movable groove 23, connecting rod 24, positioning pin 25, upper mold core 30, outer contour cavity of product 31, lower mold core 40, inner contour block of product 41, annular ejector plate 50, ejector rod 51, push plate 52, positioning hole 53, cup lid mold cavity 60, sealing mold cavity 61, transition mold cavity 62, first hollow rod 70, second hollow rod 80, first air passage 90, second air passage 91, expansion section 92. Detailed Implementation

[0024] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] Please see Figure 1-6 In this embodiment of the present invention, a disposable cup lid injection mold with a pipe-sealing structure includes an upper mold body 10 and a lower mold body 20 that are mated together. At least one mold core assembly is provided between the upper mold body 10 and the lower mold body 20. The mold core assembly includes an upper mold core 30 installed at the lower end of the upper mold body 10, at least one lower mold core 40 installed on the lower mold body 20 and corresponding to the upper mold core 30, and an annular ejector plate 50 sleeved around the lower mold core 40. A plurality of evenly distributed ejector rods 51 are connected to the lower end of the annular ejector plate 50. A movable push plate 52 is provided inside the lower mold body 20. The ejector rods 51 are fixedly connected to the push plate 52. A cup lid cavity 60 is formed between the upper mold core 30, the lower mold core 40 and the annular ejector plate 50. A glue inlet 11 is provided on the upper mold body 10. A hot runner system 12 connecting the glue inlet 11 and the cup lid cavity 60 is provided inside the upper mold body 10 and the upper mold core 30.

[0026] A first hollow rod 70 is connected between the push plate 52 and the annular ejector plate 50. A second hollow rod 80, which is connected to the first hollow rod 70, is embedded inside the upper mold core 30. A first air passage 90 is provided on the side of both the upper mold body 10 and the push plate 52. The first air passage 90 acts on the first hollow rod 70 and the second hollow rod 80. A sealing mold cavity 61 connecting the first hollow rod 70 and the second hollow rod 80 is also formed between the upper mold core 30 and the push plate 52. A transition mold cavity 62 connecting the cup lid mold cavity 60 and the sealing mold cavity 61 is also formed between the upper mold core 30 and the push plate 52.

[0027] In the above technical solution, after the upper mold body 10 and the lower mold body 20 are closed, the injection molding material is injected into the cup lid cavity 60, which is composed of the upper mold core 30, the lower mold core 40, and the annular ejector plate 50, through the injection port 11 and the hot runner system 12, to form the cup lid body. At the same time, the material flows into the sealing cavity 61 through the transition cavity 62 to form the extension strip and the pipe opening sealing structure. After the injection molding is completed, the first air passage 90 vents to the first hollow rod 70 and the second hollow rod 80, forming air pressure assisted demolding in the sealing cavity 61 and the cup lid cavity 60. Then, the push plate 52 drives the ejector rod 51 and the annular ejector plate 50 to eject the cup lid, achieving complete demolding.

[0028] This design, with its integrated cup lid cavity 60, transition cavity 62, and sealing cavity 61, ensures that the cup lid and the pipe sealing structure are molded as a single unit, improving product precision and quality stability while reducing production costs. By utilizing the air passage structure and cavity design, air pressure is used to support the thinner extension strip during mold opening, preventing it from being damaged or broken. This eliminates the need for prolonged cooling and curing, significantly shortening the molding cycle and improving production efficiency.

[0029] Please see Figure 1-2 Based on the above technical solution, the upper mold body 10 is further proposed to include a panel 13, a hot runner plate 14 installed at the lower end of the panel 13, and an upper mold plate 15 installed at the lower end of the hot runner plate 14. The injection port 11 is provided on the panel 13, the hot runner system 12 is provided in the hot runner plate 14, the upper mold core 30 is embedded in the upper mold plate 15, and a hot nozzle 16 connected to the hot runner system 12 is provided between the upper mold core 30 and the hot runner plate 14. The hot nozzle 16 is connected to the cup lid mold cavity 60. During the injection molding process, the panel 13, the hot runner plate 14 and the upper mold plate 15 of the upper mold body 10 work together. The injection port 11 on the panel 13 serves as the raw material inlet. After the injection material enters, the hot runner system 12 in the hot runner plate 14 heats and transports the raw material. Molten material is precisely injected into the cup lid cavity 60, which is composed of an upper mold core 30, a lower mold core 40, and an annular ejector plate 50, through a hot nozzle 16. The lower mold body 20 includes a base plate 21 and a lower mold plate 22 mounted on the base plate 21. A movable groove 23 is provided at the lower end of the lower mold plate 22, and a push plate 52 is guided and connected in the movable groove 23. The base plate 21 supports the lower mold plate 22, and the push plate 52 can move along the guide direction in the movable groove 23. After the injection molding is completed and cooled, the push plate 52 moves upward in the movable groove 23 under the power drive, driving the ejector rod 51 fixed thereon. The ejector rod 51 pushes the annular ejector plate 50, thereby ejecting the formed cup lid from the lower mold core 40 and demolding it. The entire process has a tight structural fit and stable material delivery, realizing efficient injection molding of a one-time cup lid.

[0030] Please see Figure 3-6 Based on the above technical solution, it is further proposed that the lower end of the upper mold core 30 is provided with at least one product outer contour cavity 31, and the lower mold core 40 is fixedly installed with a product inner contour block 41 that is connected to the product outer contour cavity 31. The product outer contour cavity 31, the product inner contour block 41 and the annular ejector plate 50 form a cup lid mold cavity 60. This contour structure design simplifies the flow path inside the mold, helps the raw material to fill evenly, reduces pressure loss during injection molding, improves molding efficiency and reduces the defect rate.

[0031] Please see Figure 4-6Based on the above technical solution, a connecting rod 24 is further proposed to be fixedly installed inside the lower template 22, and a positioning pin 25 is fixedly connected to the connecting rod 24. The lower end of the annular ejector plate 50 is provided with a positioning hole 53 that mates with the positioning pin 25. The annular ejector plate 50 is positioned and fitted by the positioning pin 25 and the positioning hole 53. In various stages such as mold closing, injection molding, and demolding, the annular ejector plate 50 can be precisely limited and guided to avoid displacement or shaking during movement, ensuring the dimensional stability of the cup lid cavity 60, thereby improving the cup lid forming accuracy and reducing product defects caused by component misalignment. At the same time, this positioning and fitting method can enhance the overall structural rigidity of the mold, reduce wear between components, and extend the service life of the mold.

[0032] Please see Figure 3 and Figure 5 Based on the above technical solution, it is further proposed that the first hollow rod 70 and the second hollow rod 80 are both provided with a second air passage 91 that runs through both ends of them. The first hollow rod 70 and the second hollow rod 80 are sealed and connected to the first air passage 90 through the second air passage 91. The second air passage 91 of the first hollow rod 70 passes through the annular top plate 50. The second air passage 91 of the first hollow rod 70 and the second hollow rod 80 is provided with an expansion part 92 at the end that connects to the sealing mold cavity 61. This can effectively and evenly disperse the gas acting on the product. Thus, the expansion part 92 can increase the gas release area, so that the air pressure acts more evenly on the extension strip and the pipe sealing structure, effectively avoiding its tearing and breakage, reducing the cooling and curing time, and improving production efficiency.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A disposable cup lid injection mold with a tube-mouth sealing structure, characterized in that, The system includes an upper mold body (10) and a lower mold body (20) that are mutually connected and fitted together. At least one mold core assembly is provided between the upper mold body (10) and the lower mold body (20). The mold core assembly includes an upper mold core (30) installed at the lower end of the upper mold body (10), at least one lower mold core (40) installed on the lower mold body (20) and corresponding to the upper mold core (30), and an annular ejector plate (50) sleeved around the lower mold core (40). Multiple uniform ejector plates are connected to the lower end of the annular ejector plate (50). The ejector rods (51) are evenly distributed, and the lower mold body (20) is provided with a movable push plate (52). The ejector rods (51) are fixedly connected to the push plate (52). The upper mold core (30), the lower mold core (40) and the annular ejector plate (50) form a cup lid cavity (60). The upper mold body (10) is provided with a glue inlet (11). A hot runner system (12) connecting the glue inlet (11) and the cup lid cavity (60) is provided inside the upper mold body (10) and the upper mold core (30). A first hollow rod (70) is connected between the push plate (52) and the annular top plate (50). A second hollow rod (80) that is connected to the first hollow rod (70) is embedded inside the upper mold core (30). A first air passage (90) is provided on the side of both the upper mold body (10) and the push plate (52). The first air passage (90) acts on the first hollow rod (70) and the second hollow rod (80). A sealing mold cavity (61) that connects the first hollow rod (70) and the second hollow rod (80) is also formed between the upper mold core (30) and the push plate (52). A transition mold cavity (62) that connects the cup lid mold cavity (60) and the sealing mold cavity (61) is also formed between the upper mold core (30) and the push plate (52).

2. The disposable cup lid injection mold with a tube-mouth sealing structure according to claim 1, characterized in that, The upper mold body (10) includes a panel (13), a hot runner plate (14) installed at the lower end of the panel (13), and an upper template (15) installed at the lower end of the hot runner plate (14). The injection port (11) is located on the panel (13), the hot runner system (12) is located inside the hot runner plate (14), the upper mold core (30) is embedded in the upper template (15), and a hot nozzle (16) connected to the hot runner system (12) is provided between the upper mold core (30) and the hot runner plate (14). The hot nozzle (16) is connected to the cup lid mold cavity (60).

3. The disposable cup lid injection mold with a tube-mouth sealing structure according to claim 2, characterized in that, The lower mold body (20) includes a base plate (21) and a lower template (22) mounted on the base plate (21). A movable groove (23) is provided at the lower end of the lower template (22), and a push plate (52) is guided and connected in the movable groove (23).

4. The disposable cup lid injection mold with a tube-mouth sealing structure according to claim 3, characterized in that, The lower end of the upper mold core (30) is provided with at least one product outer contour cavity (31), and the lower mold core (40) is fixedly installed with a product inner contour block (41) that is connected to the product outer contour cavity (31). A cup lid mold cavity (60) is formed between the product outer contour cavity (31), the product inner contour block (41) and the annular top plate (50).

5. The disposable cup lid injection mold with a tube-mouth sealing structure according to claim 3, characterized in that, A connecting rod (24) is fixedly installed inside the lower template (22), and a positioning pin (25) is fixedly connected to the connecting rod (24). The lower end of the annular top plate (50) is provided with a positioning hole (53) that mates with the positioning pin (25). The annular top plate (50) is positioned and engaged by the positioning pin (25) and the positioning hole (53).

6. The disposable cup lid injection mold with a tube-mouth sealing structure according to claim 1, characterized in that, Both the first hollow rod (70) and the second hollow rod (80) are provided with a second air passage (91) that runs through both ends of them. The first hollow rod (70) and the second hollow rod (80) are sealed and connected to the first air passage (90) through the second air passage (91). The second air passage (91) of the first hollow rod (70) runs through the annular top plate (50). The second air passage (91) of the first hollow rod (70) and the second hollow rod (80) are provided with an expansion part (92) at the end that connects to the sealing mold cavity (61).

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