Cup cover forming mold capable of improving flexibility of mold core

Abstract

The utility model relates to the technical field of dies, in particular to a cup cover forming die with improved die core flexibility, which comprises an upper die main body and a lower die main body, and at least one die core assembly is arranged between the upper die main body and the lower die main body. The mold core assembly comprises an upper mold core arranged at the lower end of the upper mold body in an embedded mode, a plurality of packaging edge inner side profiling blocks arranged on the lower mold body in an embedded mode, a plurality of cover body inner side profiling blocks fixedly installed on the packaging edge inner side profiling blocks, and a plurality of ejection rings arranged on the peripheries of the packaging edge inner side profiling blocks in a sleeving mode. The lower die body is further provided with an ejection mechanism in butt joint with the ejection ring. The packaging edge inner side profiling block and the cover body inner side profiling block are arranged to be of two independent structures, and when the diversified cup cover structure design requirements are met, the packaging edge inner side profiling blocks of the same model are matched with the corresponding ejection rings, and the packaging edge inner side profiling blocks can be suitable for production of cup covers of various different structures.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a cup lid forming mold that improves the flexibility of the mold core. Background Technology

[0002] Against the backdrop of the booming beverage industry, disposable plastic cups have seen enormous market demand due to their convenience and low cost. Currently, widely used disposable plastic cups mainly consist of a cup body and a lid that fits snugly onto the cup body. The structure of the lid is crucial, typically featuring a main lid body and a sealing edge that adapts to the cup body.

[0003] As the purchasers of disposable plastic cups, businesses have varying requirements for the structure of cup lids due to diverse market demands and brand differentiation competition. In practical applications, the design of the straw inlet directly affects the consumer experience; different types of beverages and consumption scenarios may require specific types of straw inlets. Furthermore, the lid's shape design must consider not only aesthetics but also its compatibility with the overall cup design and ease of transportation and storage.

[0004] Currently, lid manufacturing primarily relies on injection molding. However, different lid structures require corresponding mold core structures. More importantly, each mold core structure necessitates the design of a sealing edge, the structure of which is almost identical, significantly increasing the complexity of mold making. During mold manufacturing, the complex sealing edge structure demands higher precision machining equipment and more sophisticated processing techniques, especially since the inner side of the sealing edge has corresponding protrusions to accommodate the cup opening. This not only extends the mold manufacturing cycle but also significantly increases manufacturing costs. If market demand for a specific lid structure changes, existing molds often struggle to adapt quickly, forcing companies to invest substantial manpower and resources in developing new molds, further exacerbating their operational burden. Therefore, it is necessary to propose an improved technical solution to address these issues. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0006] A cup lid forming mold with improved mold core flexibility includes an upper mold body and a lower mold body. At least one mold core assembly is disposed between the upper mold body and the lower mold body. The mold core assembly includes an upper mold core embedded at the lower end of the upper mold body, multiple inner contour blocks of the sealing edge embedded on the lower mold body, multiple inner contour blocks of the lid body fixedly installed on each inner contour block of the sealing edge, and multiple ejector rings sleeved around each inner contour block of the sealing edge. The lower mold body is also provided with an ejector mechanism that engages with the ejector rings. In the mold closed state, the upper mold core, the inner contour blocks of the sealing edge, the inner contour blocks of the lid body, and the ejector rings surround to form a cavity for forming a cup lid. The upper mold body is provided with a glue injection system communicating with the cavity.

[0007] Preferably, a slot is formed on the inner contour block of the packaging edge, and an insert is formed at the lower end of the inner contour block of the cover body. The inner contour block of the packaging edge and the inner contour block of the cover body are fitted together by the slot and the insert. A first embedded screw hole is provided through the lower end of the inner contour block of the packaging edge, and a first threaded hole is provided on the inner contour block of the cover body to mate with the first embedded screw hole. The inner contour block of the packaging edge and the inner contour block of the cover body are fixedly connected by screws through the first embedded screw hole and the first threaded hole.

[0008] Preferably, the lower mold body includes a base plate and a lower template mounted on the base plate. The lower template has an inlay groove for engaging the inner contour block of the encapsulation edge. The periphery of the inlay groove has an annular groove for engaging the ejector ring. A receiving chamber is formed between the lower template and the base plate for setting the ejector mechanism.

[0009] Preferably, the lower end of the lower template has a through second embedded screw hole, and the lower end of the inner contour block of the packaging edge has a second threaded hole that mates with the second embedded screw hole. The lower template and the inner contour block of the packaging edge are connected by screws through the second embedded screw hole and the second threaded hole.

[0010] Preferably, the ejection mechanism includes a push plate and multiple sets of ejector pins mounted on the push plate. The push plate is positioned between the lower template and the base plate. Each set of ejector pins passes through the lower template and connects with the ejection ring. Each set of ejector pins has multiple pins evenly distributed.

[0011] Preferably, an overflow gap is formed between the upper mold core and the ejector ring, and the lower end of the upper mold core is also formed with a connecting groove surrounding all overflow gaps.

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

[0013] By designing the inner contour block of the encapsulation edge and the inner contour block of the lid body as two independent structures, the same model of inner contour block, paired with a corresponding ejector ring, can adapt to the production of various cup lid structures when facing diverse cup lid design requirements. This greatly reduces the need to create corresponding mold structures based on the encapsulation edge structure due to differences in cup lid structure. This independent and universal design makes the mold structure more flexible. Compared to traditional molds, it is no longer necessary to redesign the encapsulation edge structure for each cup lid structure. As a result, it not only effectively shortens the mold manufacturing cycle but also greatly reduces manufacturing costs. Once the market demand for cup lid structure changes, only the appropriate inner contour block of the lid body and upper mold core need to be replaced to quickly respond to new demands without having to redevelop the entire mold core assembly. This effectively reduces the operational burden on enterprises and greatly improves the flexibility and adaptability of production.

[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 disassembled structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the cross-sectional structure of this utility model;

[0019] Figure 4 This is a utility model Figure 3 Schematic diagram of the structure at point A;

[0020] Figure 5 This is a schematic diagram showing the disassembled structure of the inner contour block of the encapsulation edge, the inner contour block of the cover body, and the ejector ring in this utility model.

[0021] Figure 6 This is a schematic diagram of the structure of the lower template in this utility model.

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

[0023] Upper mold body 10, lower mold body 20, base plate 21, lower template 22, inlay groove 23, annular groove 24, second embedded screw hole 25, accommodating chamber 26, upper mold core 31, inner contour block of the encapsulation edge 32, slot 321, first embedded screw hole 322, second threaded hole 323, inner contour block of the cover body 33, insert block 331, first threaded hole 332, ejection ring 34, overflow gap 35, connecting groove 36, ejection mechanism 40, push plate 41, ejector pin 42, glue injection system 50. 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 cup lid forming mold with improved mold core flexibility includes an upper mold body 10 and a lower mold body 20. 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 31 embedded at the lower end of the upper mold body 10, a plurality of inner contour blocks 32 of the sealing edge embedded on the lower mold body 20, a plurality of inner contour blocks 33 of the lid body fixedly installed on each inner contour block 32 of the sealing edge, and a plurality of ejector rings 34 sleeved around each inner contour block 32 of the sealing edge. The lower mold body 20 is also provided with an ejector mechanism 40 that engages with the ejector rings 34. In the mold closed state, the upper mold core 31, the inner contour blocks 32 of the sealing edge, the inner contour blocks 33 of the lid body, and the ejector rings 34 surround to form a cavity for forming a cup lid. The upper mold body 10 is provided with a glue injection system 50 communicating with the cavity.

[0026] When the cup lid forming mold is put into operation, the upper mold body 10 and the lower mold body 20 move towards each other until they close. During this process, the upper mold core 31 embedded at the lower end of the upper mold body 10 precisely cooperates with the multiple inner contour blocks 32 of the sealing edge embedded in the lower mold body 20, the multiple inner contour blocks 33 of the lid body fixed on the inner contour blocks 32 of the sealing edge, and the multiple ejection rings 34 surrounding the inner contour blocks 32 of the sealing edge to form a cavity for forming the cup lid. At this time, the glue injection system 50 set in the upper mold body 10 opens. The process begins, injecting molten plastic into the cavity through a predetermined channel. As time progresses, the plastic gradually cools and solidifies within the cavity. Once molding is complete, the upper mold body 10 and the lower mold body 20 open. Then, the ejector mechanism 40 within the lower mold body 20 is activated, pushing the ejector ring 34, which it connects to, upwards. Under pressure, the ejector ring 34 pushes the inner contour block 33 of the lid and the inner contour block 32 of the sealing edge, ultimately ejecting the molded cup lid smoothly from the cavity, thus completing the entire cup lid molding process.

[0027] By setting the inner contour block 32 of the encapsulation edge and the inner contour block 33 of the lid body as two independent structures, when facing diverse cup lid structure design requirements, the same model of inner contour block 32 of the encapsulation edge, paired with the corresponding ejector ring 34, can adapt to the production of various cup lid structures. This greatly reduces the need to make corresponding mold structures based on the encapsulation edge structure due to differences in cup lid structure. This independent and universal design makes the mold structure more flexible. Compared with traditional molds, it is no longer necessary to redesign the encapsulation edge structure for each cup lid structure. As a result, it not only effectively shortens the mold manufacturing cycle, but also greatly reduces manufacturing costs. Once the market demand for cup lid structure changes, only the appropriate inner contour block 33 of the lid body, the upper mold core 31, and other components need to be replaced to quickly respond to new demands. There is no need to redevelop the entire mold core assembly, which effectively reduces the operational burden of enterprises and greatly improves the flexibility and adaptability of production.

[0028] Please refer to Figure 4-5Based on the above technical solution, a slot 321 is further proposed to be formed on the inner contour block 32 of the packaging edge, and an insert 331 is formed at the lower end of the inner contour block 33 of the cover body. The inner contour block 32 of the packaging edge and the inner contour block 33 of the cover body are fitted together through the slot 321 and the insert 331. A first embedded screw hole 322 is opened at the lower end of the inner contour block 32 of the packaging edge, and a first threaded hole 332 is opened on the inner contour block 33 of the cover body to mate with the first embedded screw hole 322. The inner contour block 32 of the packaging edge and the inner contour block 33 of the cover body are connected through the first embedded screw hole 322. The first threaded hole 332 is used for screw fixing connection; the inlay structure of the slot 321 and the insert block 331 can achieve fast and accurate positioning during mold assembly, which greatly improves the assembly efficiency. The screw fixing connection further strengthens the stability between the two, ensuring that the contour blocks are still tightly connected under high pressure injection molding environment, ensuring the accuracy of cup lid forming. This double fastening design makes the operation simpler when replacing the contour block 33 inside the lid corresponding to different structure cup lids. You only need to unscrew the screw and pull out the insert block 331 to complete the replacement, which greatly reduces the time cost of maintenance and mold adjustment.

[0029] Please refer to Figure 2-6Based on the above technical solution, the lower mold body 20 is further proposed to include a base plate 21 and a lower mold plate 22 mounted on the base plate 21. An inlay groove 23 for engaging with the inner contour block 32 of the encapsulation edge is provided on the lower mold plate 22. An annular groove 24 for engaging with the ejector ring 34 is provided around the inlay groove 23. A second embedded screw hole 25 is provided at the lower end of the lower mold plate 22. A second threaded hole 323 is provided at the lower end of the inner contour block 32 of the encapsulation edge, engaging with the second embedded screw hole 25. The lower mold plate 22 and the inner contour block 32 of the encapsulation edge are connected by the second embedded screw hole 25. The screw is fixedly connected by the screw hole 25 and the second threaded hole 323; the inlay groove 23 opened on the lower template 22 can accurately align with the inner contour block 32 of the packaging edge, and cooperate with the annular groove 24 of the periphery for aligning with the ejector ring 34, which facilitates the installation and positioning of the mold components and greatly improves the assembly efficiency. In addition, the lower template 22 and the inner contour block 32 of the packaging edge are fixedly connected by screws through the second embedded screw hole 25 and the second threaded hole 323, which further enhances the firmness of the connection between the two and ensures the stability of the mold structure under high pressure injection molding environment, thereby improving the precision of cup lid molding. An accommodating chamber 26 is formed between the lower mold plate 22 and the base plate 21 for setting the ejection mechanism 40. The ejection mechanism 40 includes a push plate 41 and multiple sets of ejector pins 42 mounted on the push plate 41. The push plate 41 is set between the lower mold plate 22 and the base plate 21. Each set of ejector pins 42 passes through the lower mold plate 22 and docks with the ejection ring 34. Each set of ejector pins 42 has multiple pins evenly distributed. The design of the push plate 41 with multiple sets of evenly distributed ejector pins 42 can apply a uniform and stable pushing force to the ejection ring 34 after injection molding, ensuring that the cup lid can be smoothly and completely ejected from the mold, effectively avoiding problems such as cup lid deformation caused by uneven ejection.

[0030] Please refer to Figure 4 Based on the above technical solution, it is further proposed that an overflow gap 35 be formed between the upper mold core 31 and the ejector ring 34, and a connecting groove 36 be formed around all the overflow gaps 35 at the lower end of the upper mold core 31. With this setting, the mold can connect multiple cup lids after molding using the bracket formed by the connecting groove 36, which is convenient for them to be removed by a robot after mold opening. Furthermore, the design of the overflow gap 35 makes it easy to cut between the cup lid and the bracket, that is, the waste material formed by the overflow gap 35 can be removed.

[0031] 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 cup lid forming mold with improved core flexibility, characterized in that, The mold includes an upper mold body (10) and a lower mold body (20). 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 (31) embedded at the lower end of the upper mold body (10), multiple inner contour blocks (32) of the packaging edge embedded on the lower mold body (20), multiple inner contour blocks (33) of the lid body fixedly installed on each inner contour block (32), and multiple ejector rings (34) sleeved around each inner contour block (32). The lower mold body (20) is also provided with an ejector mechanism (40) that is connected to the ejector rings (34). In the mold closed state, the upper mold core (31), the inner contour blocks (32) of the packaging edge, the inner contour blocks (33) of the lid body and the ejector rings (34) surround to form a cavity for molding a cup lid. The upper mold body (10) is provided with a glue injection system (50) connected to the cavity.

2. The cup lid forming mold with improved core flexibility according to claim 1, characterized in that, A slot (321) is formed on the inner contour block (32) of the packaging edge, and an insert (331) is formed at the lower end of the inner contour block (33) of the cover body. The inner contour block (32) of the packaging edge and the inner contour block (33) of the cover body are fitted together by the slot (321) and the insert (331). A first embedded screw hole (322) is opened at the lower end of the inner contour block (32) of the packaging edge, and a first threaded hole (332) is opened on the inner contour block (33) of the cover body, which is connected to the first embedded screw hole (322). The inner contour block (32) of the packaging edge and the inner contour block (33) of the cover body are fixedly connected by screws through the first embedded screw hole (322) and the first threaded hole (332).

3. A cup lid forming mold with improved core flexibility according to claim 1, characterized in that, The lower mold body (20) includes a base plate (21) and a lower template (22) mounted on the base plate (21). An inlay groove (23) for docking with the inner contour block (32) of the encapsulation edge is provided on the lower template (22). An annular groove (24) for docking with the ejection ring (34) is provided around the inlay groove (23). A receiving chamber (26) is formed between the lower template (22) and the base plate (21) for setting the ejection mechanism (40).

4. A cup lid forming mold with improved core flexibility according to claim 3, characterized in that, The lower template (22) has a through second embedded screw hole (25) at its lower end, and the inner contour block (32) of the packaging edge has a second threaded hole (323) that mates with the second embedded screw hole (25) at its lower end. The lower template (22) and the inner contour block (32) of the packaging edge are connected by screws through the second embedded screw hole (25) and the second threaded hole (323).

5. A cup lid forming mold with improved core flexibility according to claim 3, characterized in that, The ejection mechanism (40) includes a push plate (41) and multiple sets of ejector pins (42) mounted on the push plate (41). The push plate (41) is located between the lower template (22) and the base plate (21). Each set of ejector pins (42) passes through the lower template (22) and connects with the ejection ring (34). Each set of ejector pins (42) has multiple pins evenly distributed.

6. A cup lid forming mold with improved core flexibility according to claim 1, characterized in that, An overflow gap (35) is formed between the upper mold core (31) and the ejector ring (34), and a connecting groove (36) is formed at the lower end of the upper mold core (31) surrounding all the overflow gaps (35).

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