Injection molding mold for cover with turning cover
By using independent molding components and injection channel design, the problems of difficult demolding and uneven melt flow in injection molding of flip-top caps are solved, achieving convenient demolding and efficient production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FUJIAN HENGLONG NEW MATERIALS TECHNOLOGY CO LTD
- Filing Date
- 2025-06-03
- Publication Date
- 2026-05-12
AI Technical Summary
When a lid with a flip-top is injection molded, the lid body and the flip-top are difficult to separate, which leads to difficulties in demolding and uneven melt flow, and can easily cause material shortage.
It adopts independent lid and flip-top molding components, combined with a detachable mold structure and independent injection channel design, to ensure that the lid and flip-top are molded separately and connected by through grooves. Gas is discharged by venting channels, and the guiding and limiting structure improves accuracy.
Simplify the demolding process, reduce the risk of mold jamming, ensure uniform melt flow, and improve the integrity and yield of molded parts.
Smart Images
Figure CN224224415U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mold technology, and more specifically, to an injection molding mold for a lid with a flip-top. Background Technology
[0002] The flip-top lid is an innovative design that connects the lid to the container opening via a hinge, combining convenience and functionality. Its core advantage lies in one-handed opening and closing, eliminating the need for rotation or pressure, thus significantly improving efficiency. It is especially suitable for scenarios requiring frequent opening. When the lid is closed, a snap-fit structure ensures a high level of sealing. It is widely used in food packaging, daily chemical products, and industrial containers.
[0003] These caps are mostly manufactured using an integrated injection molding process. However, since the cap body and the flip cover are only connected at one edge, to prevent the other edges from joining together during injection molding, the flip cover and the cap body need to be kept perpendicular during molding. This makes demolding difficult after injection molding, and the perpendicular position of the cap body and flip cover can easily lead to uneven melt flow during injection molding, resulting in material shortages. Therefore, this invention proposes a new solution. Utility Model Content
[0004] The purpose of this invention is to address the problem that most lids are manufactured using an integrated injection molding process. However, since the lid body and the flip cover are only connected at one edge, to prevent the flip cover and the lid body from connecting together at the other edges during injection molding, the flip cover and the lid body need to be kept perpendicular during molding. This makes demolding difficult after injection molding, and the vertical lid body and flip cover are prone to uneven melt flow during injection molding, leading to material shortages. Therefore, this invention proposes an injection molding mold for lids with flip covers.
[0005] To achieve the above objectives, the present invention provides the following technical solution:
[0006] Injection molding molds for lids with flip-tops to improve the above-mentioned problems.
[0007] The present invention is as follows:
[0008] A cover molding assembly includes a bottom mold and a middle mold. The top of the middle mold is provided with a boss. A first side mold and a second side molding mold are provided on the outside of the boss and can be detachably installed on the top of the bottom mold. The bottom of the middle mold is provided with a first molding cavity. The first molding cavity, the boss, the first side mold and the second side molding mold form a cavity for molding the cover. The first side mold is provided with a first injection channel for injecting molten material into the cavity.
[0009] A flip-top molding assembly includes a first top mold and a second top mold that cooperate with each other. The side walls of the first top mold and the second top mold have a second molding cavity for flip-top molding. The first top mold is provided with a second injection channel for injecting melt into the second molding cavity. The middle mold is provided with a through groove that cooperates with the first top mold and the second top mold.
[0010] As a preferred embodiment of this utility model, both the first injection channel and the second injection channel have circular cross-sections, and the cross-sectional diameter of the second injection channel is smaller than that of the first injection channel.
[0011] As a preferred technical solution of this utility model, both the middle mold and the second top mold are provided with exhaust channels. The two exhaust channels are respectively connected to the interior of the first molding cavity and the second molding cavity, and the exhaust channels are used for venting during injection molding.
[0012] As a preferred technical solution of this utility model, the bottom mold is fixedly connected to the four top corners with a first guide rod located outside the first side mold and the first injection channel, and the middle mold is provided with a first guide hole corresponding to the position of the first guide rod.
[0013] As a preferred technical solution of this utility model, the top of the bottom mold is provided with a plurality of evenly distributed positioning holes, and the bottom of the first side mold and the second side forming mold are both fixedly connected with positioning pins that cooperate with the positioning holes.
[0014] As a preferred technical solution of this utility model, the inner wall of the first top mold is provided with a second guide hole, and the inner wall of the second top mold is fixedly installed with a second guide rod that cooperates with the second guide hole.
[0015] As a preferred technical solution of this utility model, the outer walls of the first top mold and the second top mold are provided with a plurality of limiting holes, and a limiting pin is movably installed inside the limiting hole, the length of the limiting pin being greater than the depth of the limiting hole.
[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0017] In the solution of this utility model:
[0018] 1. During injection molding, the cover and the flip cover are injection molded using independent molding components. At the same time, the middle mold has a through groove for the first and second top molds to pass through, which ensures that the bottom edge of the injection molded flip cover can be connected to the top of the cover. Moreover, both the cover molding component and the flip cover molding component are detachable split structures, which can effectively reduce the resistance during demolding, make it easier to demold after injection molding, and reduce the risk of mold jamming.
[0019] 2. By setting up two independent injection channels, the first injection channel and the second injection channel, the melt can be injected into the molding chamber and the second molding chamber of the cover at the same time during injection molding. This makes it easier to accurately control the overall flow direction of the melt, reduce uneven flow, better avoid dead zones and material shortages, ensure the structural integrity of the molded parts, and improve yield and production efficiency. Attached Figure Description
[0020] Figure 1 A schematic diagram of the overall structure of the injection molding mold for a lid with a flip-top, provided by this utility model;
[0021] Figure 2 The present invention provides an injection molding die for a lid with a flip-top. Figure 1 Enlarged view of the structure at point A;
[0022] Figure 3 The present invention provides an injection molding die for a lid with a flip-top. Figure 1 Enlarged view of the structure at point B;
[0023] Figure 4 The present invention provides an injection molding die for a lid with a flip-top. Figure 1 Enlarged view of the structure at point C;
[0024] Figure 5 This is a schematic diagram of the middle mold structure of the injection molding mold for a lid with a flip-top, provided by this utility model.
[0025] The image shows:
[0026] 1. Bottom mold; 2. Middle mold; 3. First top mold; 4. Boss; 5. First side mold; 6. Second side molding mold; 7. First injection channel; 8. Second top mold; 9. Second injection channel; 10. Cover; 11. First guide rod; 12. Positioning hole; 13. First guide hole; 14. Second guide rod; 15. Second guide hole; 16. Limiting pin; 17. Limiting hole; 18. Through groove; 19. First molding cavity; 20. Second molding cavity; 21. Flip cover; 22. Venting channel. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.
[0028] like Figures 1-5 As shown, this embodiment proposes an injection molding mold for a lid with a flip-top, comprising: a lid forming assembly, including a bottom mold 1 and a middle mold 2, the top of the middle mold 2 having a boss 4, and a first side mold 5 and a second side forming mold 6 detachably mounted on the top of the bottom mold 1 on the outer side of the boss 4, the bottom of the middle mold 2 having a first forming cavity 19, the first forming cavity 19, the boss 4, the first side mold 5 and the second side forming mold 6 forming a cavity for forming the lid 10, the first side mold 5 having a first injection channel 7 for injecting molten material into the cavity; and a flip-top forming assembly, including a first top mold 3 and a second top mold 8 that cooperate with each other, the opposite side walls of the first top mold 3 and the second top mold 8 having a second forming cavity 20 for forming the flip-top 21, the first top mold 3 having a second injection channel 9 for injecting molten material into the inner side of the second forming cavity 20, and the middle mold 2 having a... The through-slot 18, which cooperates with the first top mold 3 and the second top mold 8, allows the cover 10 and the flip cover 21 to be injection molded using independent molding components during injection molding. At the same time, the through-slot 18 on the middle mold 2, which allows the first top mold 3 and the second top mold 8 to pass through, ensures that the bottom edge of the injection-molded flip cover 21 can be connected to the top of the cover 10. Moreover, both the cover molding component and the flip cover molding component are detachable split structures, which can effectively reduce the resistance during demolding and make it easier to demold after injection molding, reducing the risk of mold jamming. By setting two independent injection channels, the first injection channel 7 and the second injection channel 9, melt can be injected into the molding chamber of the cover 10 and the interior of the second molding chamber 20 simultaneously during injection molding. This makes it easier to accurately control the overall flow direction of the melt, reduce uneven flow, better avoid dead zones and material shortages, ensure the structural integrity of the molded parts, and improve yield and production efficiency.
[0029] like Figure 1 As shown, in a preferred embodiment, based on the above method, the first injection channel 7 and the second injection channel 9 both have circular cross-sections, and the cross-sectional diameter of the second injection channel 9 is smaller than that of the first injection channel 7. It should be noted that by setting the first injection channel 7 and the second injection channel 9 with different cross-sectional diameters, the injection speed of the two injection channels into the molding chamber and the second molding chamber 20 of the cover 10 can be better controlled, ensuring that the filling speed of both is within a suitable range, thereby guaranteeing the strength of the connection between the cover 10 and the flip cover 21.
[0030] like Figure 1 and Figure 5 As shown, in a preferred embodiment, based on the above method, both the middle mold 2 and the second top mold 8 are provided with venting channels 22. The two venting channels 22 are respectively connected to the interior of the first molding cavity 19 and the second molding cavity 20, and the venting channels 22 are used for venting during injection molding. It should be noted that the venting channels 22 facilitate venting of the cover 10 and the flip cover 21 during injection molding.
[0031] like Figure 1 and Figure 2 As shown, in a preferred embodiment, based on the above method, the bottom mold 1 is further provided with first guide rods 11 fixedly connected to the four top corners of each of the four corners, located outside the first side mold 5 and the first injection channel 7. The middle mold 2 has first guide holes 13 corresponding to the positions of the first guide rods 11. It should be noted that the first guide rods 11 and the first guide holes 13 enable guiding and positioning between the bottom mold 1 and the middle mold 2, thereby ensuring the molding accuracy of the cover 10.
[0032] like Figure 1 and Figure 2 As shown, in a preferred embodiment, based on the above method, the bottom mold 1 further has a plurality of evenly distributed positioning holes 12 on its top, and the bottom of the first side mold 5 and the second side forming mold 6 are both fixedly connected with positioning pins that cooperate with the positioning holes 12. It should be noted that the positioning pins and positioning holes 12 facilitate the positioning of the first side mold 5 and the second side forming mold 6.
[0033] like Figure 1 , Figure 3 and Figure 4 As shown, in a preferred embodiment, based on the above method, the inner wall of the first top mold 3 is further provided with a second guide hole 15, and the inner wall of the second top mold 8 is fixedly installed with a second guide rod 14 that cooperates with the second guide hole 15. The outer walls of both the first top mold 3 and the second top mold 8 are provided with multiple limiting holes 17, and limiting pins 16 are movably installed inside the limiting holes 17. The length of the limiting pins 16 is greater than the depth of the limiting holes 17. It should be noted that the second guide rod 14 and the second guide hole 15 can be used to position the first top mold 3 and the second top mold 8, ensuring the overall forming accuracy of the flip cover 21. The limiting holes 17 and the limiting pins 16, in conjunction with the through groove 18, can position and limit the position between the middle mold 2 and the first top mold 3 and the second top mold 8, ensuring that the flip cover 21 and the cover body 10 can be precisely joined together.
[0034] Specifically, the working principle of the injection molding mold for the flip-top lid is as follows: During use, the first side mold 5 and the second side forming mold 6 are installed on top of the bottom mold 1, with the locating pin at the bottom inserted into the locating hole 12 at the top of the bottom mold 1. Then, the middle mold 2 is installed on the bottom mold 1 through the first guide hole 13 and the first guide rod 11, so that it is tightly attached to the top of the first side mold 5 and the second side forming mold 6. Next, the first top mold 3 and the second top mold 8 are joined together through the second guide rod 14 and the second guide hole 15. After joining, the limiting pin 16 is inserted into the limiting hole 17. After insertion, the joined first top mold 3 and second top mold 8 are installed through the through groove 18. The portion of the limiting pin 16 protruding from the limiting hole 17 on the middle mold 2 abuts against the top of the middle mold 2, thus completing the overall assembly of the mold. During injection molding, the melt is injected into the molding chamber of the cover 10 and the second molding cavity 20 through the first injection channel 7 and the second injection channel 9, respectively. When demolding, first remove the limiting pin 16, then move the middle mold 2 upward so that the middle mold 2 separates from the outside of the first top mold 3 and the second top mold 8. Then separate the first top mold 3 and the second top mold 8 to both sides. At this time, the flip cover 21 comes out from the inside of the second molding cavity 20. Then remove the first side mold 5 and the first injection channel 7 so that the cover 10 comes out from the inside of both. Finally, remove the cover 10 from the boss 4 to complete the demolding.
[0035] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, the present utility model is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present utility model, and all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present utility model.
Claims
1. An injection mold for a lid with a flip-top, characterized in that, include: The cover molding assembly includes a bottom mold (1) and a middle mold (2). The top of the middle mold (2) is provided with a boss (4). The outside of the boss (4) is provided with a first side mold (5) and a second side molding mold (6) that can be detachably installed on the top of the bottom mold (1). The bottom of the middle mold (2) is provided with a first molding cavity (19). The first molding cavity (19), the boss (4), the first side mold (5) and the second side molding mold (6) form a cavity for molding the cover (10). The first side mold (5) is provided with a first injection channel (7) for injecting melt into the cavity. The flip-top molding assembly includes a first top mold (3) and a second top mold (8) that cooperate with each other. The side walls of the first top mold (3) and the second top mold (8) are provided with a second molding cavity (20) for forming the flip-top (21). The first top mold (3) is provided with a second injection channel (9) for injecting melt into the inner side of the second molding cavity (20). The middle mold (2) is provided with a through groove (18) that cooperates with the first top mold (3) and the second top mold (8).
2. The injection molding mold for a lid with a flip-top as described in claim 1, characterized in that, Both the first injection channel (7) and the second injection channel (9) have circular cross-sections, and the cross-sectional diameter of the second injection channel (9) is smaller than that of the first injection channel (7).
3. The injection molding mold for a lid with a flip-top as described in claim 1, characterized in that, Both the middle mold (2) and the second top mold (8) are provided with exhaust channels (22). The two exhaust channels (22) are respectively connected to the interior of the first molding cavity (19) and the second molding cavity (20), and the exhaust channels (22) are used for venting during injection molding.
4. The injection molding mold for a lid with a flip-top as described in claim 1, characterized in that, The bottom mold (1) has four fixed top corners connected with first guide rods (11) located outside the first side mold (5) and the first injection channel (7), and the middle mold (2) has first guide holes (13) corresponding to the positions of the first guide rods (11).
5. An injection molding mold for a lid with a flip-top as described in claim 1, characterized in that, The bottom mold (1) has a plurality of evenly distributed positioning holes (12) on its top. The bottom of the first side mold (5) and the second side forming mold (6) are both fixedly connected with positioning pins that cooperate with the positioning holes (12).
6. An injection molding mold for a lid with a flip-top as described in claim 1, characterized in that, The inner wall of the first top mold (3) is provided with a second guide hole (15), and the inner wall of the second top mold (8) is fixedly installed with a second guide rod (14) that cooperates with the second guide hole (15).
7. An injection molding mold for a lid with a flip-top as described in claim 1, characterized in that, The outer walls of the first top mold (3) and the second top mold (8) are provided with a plurality of limiting holes (17). A limiting pin (16) is movably installed inside the limiting hole (17). The length of the limiting pin (16) is greater than the depth of the limiting hole (17).