Plastic forming process for anti-winding zipper head

Abstract

The invention relates to the field of zippers, in particular to a plastic forming process of an anti-winding zipper head, which comprises a zipper head and a handle which are movably connected, and the handle is rotatably arranged on the zipper head and used for applying external force to guide the zipper head to move so as to control opening and closing of zipper teeth. The technical problem that in the process that an existing zipper head is meshed and matched with zipper teeth, a gap between the zipper head and the zipper teeth is too large, so that fabric or cloth belts or thread belts are prone to being rolled into the gap, and the winding phenomenon occurs is solved.

Description

[0001] This application is a divisional application. The original application number is CN202411823125.4, the application date is December 12, 2024, and the invention title is an anti-tangling zipper slider and its plastic molding process. Technical Field

[0002] The present invention relates to the field of zippers, and particularly to a plastic molding process for an anti-tangling zipper slider. Background Art

[0003] A zipper consists of chain teeth, a slider, upper and lower stops (front and rear codes) or locking parts, etc. Among them, the chain teeth are the key part, which directly determines the side pull strength of the zipper. Generally, a zipper has two strips of chain tape, each with a row of chain teeth, and the two rows of chain teeth are arranged in an interlaced manner. The slider clamps the chain teeth on both sides and slides along the pull tab, enabling the chain teeth on both sides to mesh or disengage from each other.

[0004] In the existing zipper, due to the meshing connection between the zipper slider and the chain, during the pulling process, it is easy to roll the fabric on the chain or the fabric sewn to the chain fabric into the gap between the zipper chain teeth and the teeth. On the one hand, it causes the zipper chain teeth to get stuck and unable to be pulled; on the other hand, the hard contact between the zipper slider and the chain teeth causes tensile damage to the fabric. Especially for high-grade textile fabrics or high-grade leather, this tensile damage is often irreversible.

[0005] The invention patent with the Chinese patent application number 202110400264.6 discloses a YG zipper slider two-way safety locking and its production process. The key points of its technical solution include a slider body, a pull tab, and an elastic member. An installation groove for installing the pull tab is formed between the slider body and the elastic member. A connection groove for installing the elastic member and a limiting groove for the elastic member to extend out are provided on the slider body. The pull tab is integrally cold-punched. The pull tab includes a flat upper surface layer and a flat lower surface layer. The pull tab includes a rotating part, and the rotating part is rotatably connected in the installation groove. A convex block is provided on the rotating part. When the pull tab is perpendicular to the slider body, the elastic member retracts into the limiting groove. When the pull tab rotates to both sides of the slider body, the elastic member extends out of the limiting groove. This YG zipper slider two-way safety locking can lock the slider in two directions, improve the reminder effect for users, and reduce accidents. The technical solution proposed by the above invention does not propose a solution to the problem that the existing zipper slider is prone to pulling the fabric, and various zipper sliders applied on the market still have the technical problem of entanglement and pulling. Summary of the Invention

[0006] Therefore, in view of the above problems, the present invention proposes a plastic molding process for an anti-tangling zipper slider, which solves the technical problem that in the process of the existing zipper slider engaging with the zipper teeth, the gap between the two is too large, resulting in easy entanglement of fabrics, tapes or thread tapes in the gap.

[0007] To achieve the above object, the present invention adopts the following technical solutions: An anti-tangling zipper slider includes a slider and a pull tab that are movably connected. The pull tab is rotatably arranged on the slider and is used to apply an external force to guide the slider to move, thereby controlling the opening and closing of the zipper teeth. The slider includes a support plate, a connection mechanism, and an engagement mechanism. The support plate includes an upper functional surface and a lower functional surface. The connection mechanism is arranged on the upper functional surface of the support plate, and the engagement mechanism is arranged on the lower functional surface of the support plate. The connection mechanism is used for rotatably connecting with the pull tab. The engagement mechanism includes a first engagement protrusion, a second engagement protrusion, and a central engagement protrusion. The central engagement protrusion is arranged on the central axis of the support plate. The first engagement protrusion and the second engagement protrusion are symmetrically arranged on both sides of the central engagement protrusion. A first fitting surface is arranged on the first engagement protrusion close to the central engagement protrusion, and a second fitting surface is arranged on the second engagement protrusion close to the central engagement protrusion. The first fitting surface and the second fitting surface are symmetrical to each other. A first anti-tangling structure is arranged on the first fitting surface, and a second anti-tangling structure is arranged on the second fitting surface. During use, the first anti-tangling structure and the second anti-tangling structure are in rolling connection with the tape of the zipper. The pull tab includes a connecting rod and a pull block that are fixedly connected.

[0008] Further, the connection mechanism includes a first connection seat, a second connection seat, and a snap pin. Both the first connection seat and the second connection seat are arranged on the central axis of the support plate. A first card slot is arranged on one side surface of the first connection seat close to the second connection seat. A second card slot is arranged on the second connection seat. The snap pin is arranged in the first card slot through a torsion spring and is clamped between the first card slot and the second card slot. The pull tab is rotatably connected to the connection mechanism by passing through the second connection seat.

[0009] Further, a pin is arranged on the snap pin, and the pin penetrates downward through the upper functional surface of the support plate. A top block is arranged at the central position of the connecting rod. When the connecting rod rotates to the position where the top block abuts against the snap pin, the pin is lifted upward. When the connecting rod rotates to the position where the top block is separated from the snap pin, the pin is inserted downward into the support plate.

[0010] Furthermore, the first anti-winding structure and the second anti-winding structure have the same structure, and the first anti-winding structure includes a plurality of clamping grooves arranged on the first bonding surface and balls embedded in the clamping grooves.

[0011] A plastic molding process for an anti-winding zipper pull comprises the following steps: S1, mixing raw materials; picking up raw materials for mixing, the raw materials include polycarbonate particles and ABS resin particles, the two are mixed in a ratio of 1:1, the particles are mixed in a molten state by a heating device and further stirred to obtain a mixed raw material; S2, heating the raw material conveying flow channel to 225 degrees Celsius-325 degrees Celsius, and introducing the raw material into the zipper chain head plastic molding device through the raw material conveying flow channel for injection molding operation; S3, the injection mold is subjected to pressure holding treatment, and the pressure holding time is 1.5 seconds to 3.0 seconds; S4, shaping and cooling; cooling the zipper head by a cooling device built into the zipper head plastic molding device, so that the temperature of the zipper head plastic molding device is quickly reduced to 40 degrees Celsius-60 degrees Celsius, and then demolding, and then placing it on a cooling rack to cool to room temperature, to obtain a zipper head; S5. Assemble: Assemble the formed chain head and handle.

[0012] Furthermore, in step S4, the cooling device performs auxiliary demoulding operations on the molded zipper head during the shaping and cooling process.

[0013] Furthermore, the zipper link plastic molding device includes a plastic molding upper template and a plastic molding lower template that cooperate with each other, a first molding cavity is arranged on a side surface of the plastic molding upper template close to the plastic molding lower template, and a second molding cavity is arranged on a side surface of the plastic molding lower template close to the plastic molding upper template, the first molding cavity and the second molding cavity together constitute a plastic molding cavity, and the cooling device includes a first cooling part and a second cooling part, the first cooling part is arranged in the plastic molding upper template, and the second cooling part is arranged in the plastic molding lower template.

[0014] Furthermore, the first cooling part and the second cooling part have the same structure, the first cooling part is close to the first molding cavity, and the second cooling part is close to the second molding cavity. The first cooling part includes closely arranged cooling pipes and elastic toggle plates arranged on the inner walls of the cooling pipes. The cooling pipes are used for the circulation of coolant to cool the first molding cavity through heat transfer.

[0015] Furthermore, the elastic toggle plates are disposed around the inner wall of the cooling tube, and vertical projections of the elastic toggle plates do not overlap with each other.

[0016] Furthermore, the elastic toggle plate is a thin metal plate.

[0017] By adopting the above technical solution, the beneficial effects of the present invention are: 1. Compared with the existing zipper head, the main improvement of the present invention is that by improving the structure at the connection between the zipper head and the zipper tape, the zipper head is prevented from getting stuck due to the surrounding fabrics or thread ends being entangled and unable to be pulled out during the process of pulling back and forth. In serious cases, it may also cause damage to the precious fabrics. At the same time, it can make the pulling process of the zipper head smoother. Specifically, a first bonding surface is provided on the first meshing portion of the zipper head, and a second bonding surface is provided on the second meshing portion. The first bonding surface and the second bonding surface are the parts where the zipper head directly contacts the zipper tape. The conventional structure designs the connection mode of this part as a sliding connection, while the present invention innovatively adopts a first anti-winding structure provided on the first bonding surface and a second anti-winding structure provided on the second bonding surface. The first anti-winding structure and the second anti-winding structure are used to achieve the connection with the zipper The rolling connection between the fabric tapes replaces the original sliding connection. The advantages of this are as follows: first, the rolling connection can make the clothing fabric or thread that may have entered the zipper head through the gap stop moving when it reaches the end of the gap. The principle is that one side of the fabric is in a rolling connection with the zipper head, the friction between the two is greatly reduced, and the pulling force between the zipper head and the zipper teeth is offset when they are engaged; second, when encountering fabrics with a rough surface or the fabric is accidentally entangled in the gap of the zipper head, it can also be easily pulled out. The principle is also that one end of the fabric is in a rolling connection with the zipper head, rather than a traditional sliding connection. When the entangled fabric is pulled out by external force, the fabric is in a rolling connection with the zipper head, and there is no friction between the two, so it can be easily pulled out without causing pulling damage.

[0018] 2. The first anti-winding structure and the second anti-winding structure in the present invention both adopt a ball structure. On the one hand, the ball structure can ensure that the zipper teeth and the zipper tape are in a rolling connection. Compared with the traditional sliding connection, it can reduce the generation of friction, thereby reducing the friction loss between the zipper teeth and the zipper head, and extending the service life of the zipper. On the other hand, the zipper teeth are engaged by a push-type engagement method through the ball, which is more efficient and smoother.

[0019] 3. The main improvement of the plastic molding process for zipper head proposed in the present invention compared with the traditional zipper head molding process is that: by performing molding and cooling while performing auxiliary demolding in step S4, the two are performed simultaneously to improve the production efficiency of the zipper head. As is known to all, the key points in the plastic molding process are the molding and demolding of the product. During the molding process, it is necessary to avoid the formation of cavities and surface pits or bubbles inside the product. After the molding is completed, it is necessary to cool down and demold in time. The two are key links in the plastic molding process. The present invention integrates and improves the two most critical links, and the working processes of the two cooperate with each other. The principle is that the first cooling part and the second cooling part are respectively arranged in the plastic molding upper template and the plastic molding lower template, and the two are respectively close to the first molding cavity and the second molding cavity. The cooling method Cooling is performed by heat transfer using a coolant, wherein both are tubular structures of cooling tubes, through which the coolant circulates, and a toggle plate is provided in the cooling tube. The elastic toggle plate is arranged around the inner wall of the cooling tube and is arranged in a direction pointing to the central axis of the cooling tube, that is, it is parallel to the cross-section of the cooling tube. In this way, when the coolant circulates, it will impact the elastic toggle plate on the inner wall of the cooling tube, and each elastic toggle plate will undergo elastic deformation after the impact, and the relatively arranged elastic toggle plates will abut against each other, thereby generating vibration and transmitting it to the first molding cavity and the second molding cavity, so as to cool and vibrate the molded zipper chain head and perform demolding operations, which greatly improves work efficiency. At the same time, along with the generation of vibration, bubbles and holes that may be generated inside and on the surface of the zipper chain head can also be removed.

[0020] 4. The elastic toggle plate in the present invention is made of a thin metal plate. The metal plate material has better metal elasticity and better resilience. The force generated by the toggle collision when the plates are directly pressed against each other is greater, and the vibration generated is more obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from another angle; Figure 3 It is a schematic diagram of the top view structure of the present invention; Figure 4 It is a bottom view structural schematic diagram of the present invention; Figure 5 It is a side structural sectional view of the present invention; Figure 6 This is a flow chart of the plastic molding process of the present invention; Figure 7 Schematic diagram of the internal structure of the plastic molding device for the zipper slider of the present invention; Figure 8 Top view of the arrangement structure of the first cooling part in the present invention; Figure 9 Cross-sectional view of the cooling pipe in the present invention. Specific embodiments

[0022] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0023] Please refer to Figures 1-9 , the present invention provides an anti-tangling zipper slider, which includes a slider 1 and a pull tab 2 that are movably connected. The pull tab 2 is rotatably arranged on the slider 1 and is used to apply an external force to guide the movement of the slider 1, thereby controlling the opening and closing of the zipper teeth; The slider 1 includes a support plate 11, a connection mechanism 12, and a meshing mechanism 13. The support plate 11 includes an upper functional surface and a lower functional surface. The connection mechanism is arranged on the upper functional surface of the support plate 11, and the meshing mechanism 13 is arranged on the lower functional surface of the support plate 11. The connection mechanism 12 is used for rotatably connecting with the pull tab 2. The meshing mechanism 13 includes a first meshing convex portion 131, a second meshing convex portion 132, and a central meshing convex portion 133. The central meshing convex portion 133 is arranged on the central axis of the support plate 11. The first meshing convex portion 131 and the second meshing convex portion 132 are symmetrically arranged on both sides of the central meshing convex portion 133. A first fitting surface 1311 is arranged on the first meshing convex portion 131 close to the central meshing convex portion 133, and a second fitting surface 1321 is arranged on the second meshing convex portion 132 close to the central meshing convex portion 133. The first fitting surface 1311 and the second fitting surface 1321 are symmetrical to each other. A first anti-tangling structure is arranged on the first fitting surface 1311, and a second anti-tangling structure is arranged on the second fitting surface 1321. During use, the first anti-tangling structure and the second anti-tangling structure are in rolling connection with the cloth tape of the zipper; The pull tab 2 includes a connecting rod 21 and a pull block 22 that are fixedly connected.

[0024] The connecting mechanism 12 includes a first connecting seat 121, a second connecting seat 122, and a fastening pin 123. Both the first connecting seat 121 and the second connecting seat 122 are arranged on the central axis of the support plate 11. A first card slot 1211 is provided on one side of the first connecting seat 121 close to the second connecting seat 122. A second card slot 1221 is provided on the second connecting seat 122. The fastening pin 123 is arranged in the first card slot 1211 through a torsion spring and is fastened between the first card slot 1211 and the second card slot 1221. The handle 2 is rotatably connected to the connecting mechanism 12 by passing through the second connecting seat 122.

[0025] A pin 1231 is provided on the fastening pin 123. The pin 1231 penetrates downward through the upper functional surface of the support plate 11. A top block 211 is provided at the central position of the connecting rod 21. When the connecting rod 21 rotates until the top block 211 abuts against the fastening pin 123, the pin 1231 is lifted upward. When the connecting rod 21 rotates until the top block 211 separates from the fastening pin 123, the pin 1231 is inserted downward into the support plate 11. The first anti-tangling structure and the second anti-tangling structure have the same structure. The first anti-tangling structure includes four clamping grooves 31 provided on the first fitting surface and balls 3 embedded in the clamping grooves 31. By providing the first anti-tangling structure and the second anti-tangling structure, the original connection method between the zipper slider and the zipper cloth bag is changed from a sliding connection to a rolling connection, reducing the friction between the two and reducing the risk of entanglement.

[0026] This embodiment simultaneously presents a plastic molding process for the above-mentioned zipper slider. A plastic molding process for an anti-tangling zipper slider includes the following steps: S1. Raw material mixing: Pick up raw materials for mixing. The raw materials include polycarbonate particles and ABS resin particles, which are mixed in a ratio of 1:1. After the particles are mixed, they are melted and mixed through a heating device and then further stirred to obtain a mixed raw material; S2. Heat the raw material conveying channel to 225 °C - 325 °C, and introduce the raw materials into the zipper slider plastic molding device through the raw material conveying channel for injection molding operations; S3. Perform a pressure holding process on the injection mold, and the pressure holding time is 1.5 seconds - 3.0 seconds; S4. Shaping and cooling: Cool the zipper slider through a cooling device built in the zipper slider plastic molding device, quickly reduce the temperature of the zipper slider plastic molding device to 40 °C - 60 °C, then demold, and then place it on a cooling rack to cool to room temperature to obtain a zipper slider; S5. Assembly: Assemble the molded slider and the handle.

[0027] Among them, in step S4, the cooling device performs auxiliary demoulding operation on the formed zipper head during the shaping and cooling process.

[0028] In the plastic molding process, the zipper head plastic molding device includes a plastic molding upper template 4 and a plastic molding lower template 5 that cooperate with each other, a first molding cavity 41 is arranged on a side surface of the plastic molding upper template 4 close to the plastic molding lower template 5, and a second molding cavity 51 is arranged on a side surface of the plastic molding lower template 5 close to the plastic molding upper template 4. The first molding cavity 41 and the second molding cavity 51 together constitute a plastic molding cavity, and the cooling device includes a first cooling part 6 and a second cooling part 7, the first cooling part 6 is arranged in the plastic molding upper template 4, and the second cooling part 7 is arranged in the plastic molding lower template 5, the first cooling part 6 and the second cooling part 7 have the same structure, the first cooling part 6 is close to the first molding cavity 41, and the second cooling part 7 is close to the second molding cavity 51. The first cooling part 6 includes a closely arranged cooling tube and an elastic toggle plate 8 arranged on the inner wall of the cooling tube. The cooling tube is used for the circulation of coolant to cool the first molding cavity 41 by heat transfer. The elastic toggle plate 8 is arranged on the inner wall of the cooling tube, and the vertical projections of each elastic toggle plate 8 do not overlap with each other. The elastic toggle plate 8 is a thin metal plate. When the elastic toggle plate 8 is impacted by the coolant, the adjacent elastic toggle plates 8 will contact and collide with each other and vibrate. The coolant is circulated intermittently to ensure that the elastic toggle plates 8 collide with each other at a certain frequency and generate vibrations of a certain frequency. At this time, the coolant is used to cool and dissipate the heat of the plastic molding cavity on the one hand, and on the other hand, it drives the elastic toggle plate 8 to vibrate to facilitate mold demolding and avoid bubbles and holes on its surface and inside.

[0029] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0030] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A plastic molding process for an anti-entanglement zipper chain head, characterized in that: The following steps are involved: S1, mixing raw materials; picking up raw materials for mixing, the raw materials include polycarbonate particles and ABS resin particles, the two are mixed in a ratio of 1:1, the particles are mixed in a molten state by a heating device and further stirred to obtain a mixed raw material; S2, heating the raw material conveying flow channel to 225 degrees Celsius-325 degrees Celsius, and introducing the mixed raw materials into the zipper chain head plastic molding device through the raw material conveying flow channel for injection molding operation; S3, performing a pressure holding process on the zipper head plastic molding device, the pressure holding time being 1.5 seconds to 3.0 seconds; S4, shaping and cooling; cooling the zipper head by a cooling device built into the zipper head plastic molding device, so that the temperature of the zipper head plastic molding device is quickly reduced to 40 degrees Celsius-60 degrees Celsius, and then demolding, and then placing it on a cooling rack to cool to room temperature, to obtain a zipper head; S5, assembling: assembling the formed zipper head and handle; The zipper head plastic molding device comprises a plastic molding upper template and a plastic molding lower template that cooperate with each other, a first molding cavity is arranged on a side surface of the plastic molding upper template close to the plastic molding lower template, a second molding cavity is arranged on a side surface of the plastic molding lower template close to the plastic molding upper template, the first molding cavity and the second molding cavity together constitute a plastic molding cavity, the cooling device comprises a first cooling part and a second cooling part, and the first cooling part and the second cooling part have the same structure; Among them, in step S4, the cooling device performs auxiliary demoulding operations on the zipper chain head after shaping and cooling after forming. The first cooling part and the second cooling part are respectively arranged in the plastic molding upper template and the plastic molding lower template, and the two are respectively close to the first molding cavity and the second molding cavity. The cooling method adopts cooling by heat transfer of coolant, and both of them are tubular structures of cooling pipes. The coolant circulates through the cooling pipes. At the same time, an elastic toggle plate is arranged in the cooling pipe. The elastic toggle plate is arranged around the inner wall of the cooling pipe. The vertical projections of each elastic toggle plate do not overlap with each other, and the setting direction points to the central axis of the cooling pipe, that is, it is parallel to the cross-section of the cooling pipe. When the coolant circulates During the process, the elastic toggle plates on the inner wall of the cooling tube will be impacted. The elastic toggle plates are thin metal plates. Each elastic toggle plate will undergo elastic deformation after being impacted, and the relatively arranged elastic toggle plates will collide with each other, thereby generating vibration and transmitting it to the first molding cavity and the second molding cavity, so as to cool and vibrate the molded zipper chain head and perform demolding operations. At the same time, along with the generation of vibration, bubbles and holes that may be generated inside and on the surface of the zipper chain head can be removed, and when the elastic toggle plates are impacted by the coolant, adjacent elastic toggle plates will contact and collide with each other, thereby vibrating. The coolant is circulated intermittently to ensure that the elastic toggle plates collide with each other at a certain frequency, thereby generating vibrations of a certain frequency.

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