Threaded pulp molded bottle cap production mold

Abstract

The utility model belongs to paper pulp molding technical field discloses a kind of thread paper pulp molding bottle cap production mould;The mould includes lower mould component, upper mould component and the convex die of slidable setting;It further includes adjusting mechanism being arranged at the top of upper mould;The adjusting mechanism includes fixed base, threaded rod being connected in fixed base, telescopic column being slidably arranged in fixed base, push plate and spring being fixedly connected with telescopic column;The telescopic column is rotatably connected with threaded rod, the push plate is fixedly connected with convex die, and the spring is abutted to fixed base and push plate.The utility model provides sustained and stable high pressure for convex die by the synergistic effect of threaded rod and spring, solves the problem that uneven extrusion pressure leads to poor thread forming in the prior art, and ensures the forming quality and density of internal thread of bottle cap.

Description

Technical Field

[0001] This utility model relates to the field of pulp molding technology, and in particular to a mold for producing threaded pulp molded bottle caps. Background Technology

[0002] Pulp molding technology is a method of producing packaging products using plant fibers as raw materials through molding, drying, and curing. Due to its green, environmentally friendly, and biodegradable characteristics, it has broad application prospects in replacing traditional plastic products. In recent years, with increasing environmental protection requirements, bottle caps produced using pulp molding technology have begun to attract attention, aiming to replace traditional plastic bottle caps.

[0003] However, a core technical challenge in producing threaded pulp molded bottle caps is how to accurately and consistently mold a standard-compliant internal thread structure. During molding, the pulp raw material needs to be squeezed under high pressure to expel a large amount of water and adhere tightly to the mold surface, allowing the fibers to fully fill the tiny grooves in the threads. Existing pulp molding equipment typically uses hydraulic or pneumatic methods to apply pressure. While these systems can provide initial extrusion force, the pressure often becomes difficult to maintain consistently and evenly after the pulp water is squeezed out and its volume shrinks slightly, especially during the heating and curing process of the mold, where the pressure drop is even more pronounced. This insufficient or unstable pressure directly leads to insufficient adhesion of the pulp fibers to the threads, ultimately resulting in unclear thread profiles, low strength, and easy wear on the finished bottle cap, severely affecting the cap's sealing performance and usability.

[0004] Therefore, this utility model proposes a mold for producing threaded pulp molded bottle caps to overcome the shortcomings of the prior art. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a mold for producing threaded pulp bottle caps, which aims to improve the problems in the prior art where the alignment accuracy is difficult to guarantee, the extrusion pressure is uneven and difficult to maintain, and the integration of the mold-locking and heating curing processes is not high when producing bottle caps with internal threads.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a mold for producing threaded pulp molded bottle caps, comprising: a lower mold assembly, the lower mold assembly including a lower mold having a concave mold and an alignment hole; an upper mold assembly, the upper mold assembly including an upper mold, the bottom of the upper mold having a positioning post that slides with the alignment hole; and a punch, the punch being slidably disposed within the upper mold and corresponding to the concave mold; The mold also includes an adjustment mechanism located on the top of the upper mold.

[0007] The adjustment mechanism includes a fixed base, a threaded rod, a telescopic column, a push plate, and a spring.

[0008] Furthermore, the fixed base is fixed to the top of the upper mold; the threaded rod is threadedly connected to the fixed base; the telescopic column is slidably disposed within the fixed base, and the upper end of the telescopic column is rotatably connected to the bottom end of the threaded rod; the push plate is fixedly connected to the lower end of the telescopic column, and the push plate is slidably disposed inside the upper mold and fixedly connected to the top of the punch; the upper end of the spring abuts against the inner wall of the upper mold, and the lower end abuts against the top surface of the push plate.

[0009] Preferably, an alignment mechanism is fixedly connected to the side of the lower mold, and the alignment mechanism includes a rotating base.

[0010] Preferably, a vertical shaft is rotatably connected to the rotating base.

[0011] Preferably, a rotating plate is fixedly connected to the top end of the rotating shaft.

[0012] Preferably, the rotating base has a through hole for a bolt to pass through, and the bolt can be detachably passed through the rotating base and threaded to the upper mold.

[0013] Preferably, a heating tube is embedded inside the upper mold.

[0014] Preferably, a heating tube is also embedded inside the lower mold.

[0015] Preferably, the push plate is a circular plate, and the telescopic column is fixedly connected to the center of the push plate.

[0016] Preferably, the outer peripheral sidewall of the punch is machined with external threads.

[0017] This utility model has the following beneficial effects: 1. In this utility model, by setting an adjustment mechanism, the rotational motion of the threaded rod is converted into the linear motion of the telescopic column and the push plate to drive the movable punch to forcefully squeeze the pulp. At the same time, the spring provides continuous and stable pressure compensation during the squeezing process, which solves the problems of uneven and inconsistent squeezing pressure in the prior art, resulting in incomplete pulp fiber filling and poor thread formation. It achieves the technical effect of high squeezing pressure, stable control, dense pulp fiber filling, and clear and full thread formation.

[0018] 2. In this utility model, by setting a positioning post on the upper mold assembly and opening an alignment hole on the lower mold assembly that precisely matches it, the problem of low alignment accuracy and easy misalignment and scratch during high-speed mold closing is solved. This achieves accurate mold closing, stable guidance, and effectively prevents interference or damage between the punch and die during mold closing, thus protecting the fragile thread structure.

[0019] 3. In this utility model, the upper mold and the lower mold are firmly locked together after extrusion by setting bolts on the alignment mechanism, and heated and cured by heating pipes set inside the mold. This solves the problems of mold separation due to internal steam pressure and low heating efficiency in existing molds during heating, and achieves the technical effects of reliable mold locking, prevention of bottle cap deformation during curing, uniform and efficient heating, and significant shortening of the production cycle. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of a mold for producing threaded pulp bottle caps proposed in this utility model. Figure 2 This is a schematic diagram of the telescopic column part of a mold for producing threaded pulp molded bottle caps according to this utility model. Figure 3 This is a schematic diagram of the push plate part of a mold for producing threaded pulp molded bottle caps according to the present invention. Figure 4 This is a schematic diagram of the lower mold part of a mold for producing threaded pulp molded bottle caps, as proposed in this utility model.

[0021] Legend: 1. Upper mold assembly; 101. Upper mold; 102. Punch; 103. Positioning pin; 2. Lower mold assembly; 201. Lower mold; 202. Die; 203. Alignment hole; 3. Adjustment mechanism; 301. Threaded rod; 302. Fixed base; 303. Telescopic pin; 304. Push plate; 305. Spring; 4. Alignment mechanism; 401. Rotating base; 402. Rotating shaft; 403. Rotating plate; 404. Bolt; 5. Heating tube. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Reference Figures 1 to 4 This utility model provides a mold for producing threaded pulp molded bottle caps. The mold aims to solve the problems in the prior art when producing bottle caps with internal threads, such as difficulty in ensuring alignment accuracy, uneven and unsustainable extrusion pressure, and low integration of mold locking and heating curing processes.

[0024] The mold for producing threaded pulp bottle caps includes a lower mold assembly 2, an upper mold assembly 1, a punch 102, and an adjustment mechanism 3 located on top of the upper mold assembly 1.

[0025] The lower mold assembly 2 includes a lower mold 201, on which a cavity 202 and an alignment hole 203 are provided.

[0026] The upper mold assembly 1 is positioned above the lower mold assembly 2. The upper mold assembly 1 includes an upper mold 101. A positioning post 103 is fixed at the bottom of the upper mold 101. The positioning post 103 slides with the alignment hole 203 to ensure the precise alignment of the upper mold assembly 1 and the lower mold assembly 2 during the mold closing process.

[0027] The punch 102 is slidably disposed within the upper mold 101 and corresponds to the die 202.

[0028] Adjustment mechanism 3 is the core driving component; its detailed structure is described in reference [reference needed]. Figure 1 and Figure 2 The adjusting mechanism 3 includes a fixed base 302, a threaded rod 301, a telescopic column 303, a push plate 304, and a spring 305; The fixing seat 302 is fixed to the top of the upper mold 101; The threaded rod 301 is vertically threaded to the fixed seat 302; The telescopic column 303 is slidably disposed in the fixed base 302. The upper end of the telescopic column 303 is rotatably connected to the bottom end of the threaded rod 301. By rotating the threaded rod 301, the telescopic column 303 can be driven to make a vertical linear movement. The push plate 304 is fixedly connected to the lower end of the telescopic column 303. The push plate 304 is slidably disposed inside the upper mold 101 and fixedly connected to the top of the punch 102, thereby transmitting the linear motion of the telescopic column 303 to the punch 102. Spring 305 is housed inside upper mold 101. The upper end of spring 305 abuts against the inner wall of upper mold 101, and the lower end abuts against the top surface of push plate 304. When the telescopic column 303 drives the push plate 304 to move downward and squeeze, spring 305 is stretched, providing continuous and stable pressure compensation.

[0029] The alignment mechanism 4 includes a rotating base 401, which is fixedly connected to the side of the lower mold 201; A vertical rotating shaft 402 is rotatably connected to the rotating base 401; A rotating plate 403 is fixedly connected to the top of the rotating shaft 402. The rotating plate 403 can rotate around the rotating base 401 with the rotating shaft 402. During initial alignment, the rotating plate 403 can be pulled to a vertical position to provide rough guidance for the descent of the upper mold assembly 1. The alignment mechanism 4 also includes a bolt 404. The rotating base 401 has a through hole for the bolt 404 to pass through. After the lower mold assembly 2 and the upper mold assembly 1 are completely closed, the bolt 404 can be detachably passed through the rotating base 401 and threaded to the upper mold 101, thereby firmly locking the upper mold 101 and the lower mold 201 together.

[0030] In a preferred embodiment, in order to achieve rapid heating and curing of the pulp blank, a heating tube 5 is embedded inside the upper mold 101; more preferably, in order to achieve more uniform and efficient heating, a heating tube 5 is also embedded inside the lower mold 201. The heating tube 5 is preferably a resistance wire heating tube 5. By controlling the external power supply, it is ensured that the upper mold 101 and the lower mold 201 can be heated synchronously to bake the pulp in the concave mold 202 on both sides, which significantly shortens the molding cycle.

[0031] As another preferred embodiment, in order to ensure uniform pressure transmission, the push plate 304 is specifically shaped as a circular plate, and the lower end of the telescopic column 303 is fixedly connected to the center of the push plate 304. This central connection ensures that the downward pressure applied by the telescopic column 303 can be evenly distributed on the push plate 304, and then smoothly transmitted to the punch 102, avoiding the punch 102 from tilting or jamming due to uneven force.

[0032] In another preferred embodiment, in order to form the internal thread of the bottle cap, an external thread is machined on the outer peripheral sidewall of the punch 102. The pitch and tooth profile of the external thread match the internal thread of the target bottle cap. When the punch 102 extrudes the pulp, the pulp fibers fill and adhere to the external thread and are shaped during the subsequent heating and curing process, thereby accurately replicating the required thread structure on the inner wall of the bottle cap.

[0033] Working principle: When production is carried out, the pulp raw material is first placed inside the concave mold 202 of the lower mold 201. Then, the alignment mechanism 4 is operated to pull the rotating plate 403 to rotate around the rotating shaft 402 to a vertical position, providing a guide path for the descent of the upper mold assembly 1. Next, the upper mold assembly 1 descends, and the positioning pin 103 at the bottom of the upper mold 101 slides into the alignment hole 203 and is inserted into the alignment hole 203 of the lower mold 201, so as to achieve precise positioning of the upper mold assembly 1 and the lower mold assembly 2. At the same time, the punch 102, which is slidably set in the upper mold 101, enters the die 202. Then, the adjustment mechanism 3 is activated. By rotating the threaded rod 301 that is vertically threaded to the fixed seat 302, the threaded rod 301 is rotated and connected to the upper end of the telescopic column 303, driving the telescopic column 303 to slide down in the fixed seat 302. The telescopic column 303 is fixedly connected to the push plate 304 at its lower end, causing the push plate 304, which is slidably set inside the upper mold 101, to press down. The push plate 304 then causes the punch 102, which is fixedly connected to the bottom of the push plate 304, to press down. The external threads on the outer peripheral sidewall of the punch 102 forcefully extrude and form the pulp in the die 202. During the pressing process of the push plate 304, the spring 305 is stretched between the inner wall of the upper mold 101 and the top surface of the push plate 304, providing continuous and uniform pressure compensation for the extrusion process and ensuring that the pulp fibers fully fill the threads. After the extrusion is completed, the detachable bolt 404 is passed through the rotating base 401 and threaded to the upper mold 101 to achieve a firm lock between the upper mold assembly 1 and the lower mold assembly 2, preventing the mold from separating during heating. Subsequently, the heating pipes 5 embedded inside the upper mold 101 and the lower mold 201 are activated to heat and solidify the wet pulp in the mold cavity, so that it dries and sets. After heating is complete, first unscrew the bolt 404 to unlock it, then rotate the threaded rod 301 in the opposite direction to retract the telescopic column 303, the push plate 304 and the punch 102 upwards. Finally, lift the upper mold assembly 1 to open the mold, and the formed threaded pulp molded bottle cap can be taken out from the concave mold 202.

Claims

1. A mold for producing threaded pulp molded bottle caps, comprising: The lower mold assembly (2) includes a lower mold (201), which has a cavity (202) and an alignment hole (203). The upper mold assembly (1) includes an upper mold (101), and the bottom of the upper mold (101) is fixed with a positioning post (103) that slides with the alignment hole (203). A punch (102) is slidably disposed in the upper mold (101) and corresponds to the die (202). The mold is characterized in that it further includes an adjustment mechanism (3) disposed on the top of the upper mold (101). The adjustment mechanism (3) includes a fixed seat (302), a threaded rod (301), a telescopic column (303), a push plate (304), and a spring (305). The fixed seat (302) is fixed to the top of the upper mold (101), the threaded rod (301) is threadedly connected to the fixed seat (302), and the telescopic column (303) is slidably disposed on the top of the upper mold (101). Inside the fixed base (302), the upper end of the telescopic column (303) is rotatably connected to the bottom end of the threaded rod (301), the push plate (304) is fixedly connected to the lower end of the telescopic column (303), the push plate (304) is slidably disposed inside the upper mold (101) and fixedly connected to the top of the punch (102), the upper end of the spring (305) abuts against the inner wall of the upper mold (101), and the lower end abuts against the top surface of the push plate (304).

2. The die for producing a threaded pulp molded bottle cap according to claim 1, characterized in that, The lower mold (201) is fixedly connected to an alignment mechanism (4), which includes a rotating base (401).

3. The die for producing a threaded pulp molded bottle cap according to claim 2, characterized in that, A vertical shaft (402) is rotatably connected to the rotating base (401).

4. The die for producing a threaded pulp molded bottle cap according to claim 3, characterized in that, A rotating plate (403) is fixedly connected to the top end of the rotating shaft (402).

5. A mold for producing threaded pulp molded bottle caps according to claim 2, characterized in that, The rotating base (401) has a through hole for a bolt (404) to pass through. The bolt (404) is detachably passed through the rotating base (401) and threaded to the upper mold (101).

6. The die for producing a threaded pulp molded bottle cap according to claim 1, characterized in that, A heating tube (5) is embedded inside the upper mold (101).

7. A mold for producing threaded pulp molded bottle caps according to claim 6, characterized in that, Heating pipes (5) are also embedded inside the lower mold (201).

8. The die for producing a threaded pulp molded bottle cap according to claim 1, characterized in that, The push plate (304) is a circular plate, and the telescopic column (303) is fixedly connected to the center of the push plate (304).

9. A mold for producing threaded pulp molded bottle caps according to claim 1, characterized in that, The outer peripheral sidewall of the punch (102) is machined with external threads.

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