Manufacturing process of magnetic zipper

Abstract

The application discloses a manufacturing process of a magnetic zipper. The manufacturing process comprises the following steps: a magnet of an upper assembly of the magnetic zipper is formed by a lower injection mold; a supporting column of the lower injection mold is attached to the magnet and limits the radial movement of the magnet; an upper injection mold is placed above the lower injection mold to perform mold closing, and a gap is reserved between the magnet and the upper injection mold; liquid injection material is injected from the bottom to the top along the flow guide groove outside the supporting column of the lower injection mold, so that the liquid injection material first contacts the top surface of the magnet and diffuses to fill the gap to form a uniform impact force on the magnet from the top to the bottom; the liquid injection material fills the mold cavity from the top to the bottom along the side wall of the magnet; and the upper assembly of the magnetic zipper is formed by demolding. The manufacturing process has the advantages of simplifying the process, reducing the cost, improving the product quality, and reducing the probability of metal debris.

Description

Technical Field

[0001] This invention relates to a zipper manufacturing process, and more particularly to a magnetic zipper manufacturing process. Background Technology

[0002] The conventional method of connecting zippers involves interlocking the left and right inserts, then pulling the zipper upwards to join the two sides together. Because the inserts at the interlocking points are relatively small, conventional zippers are prone to misalignment, especially in winter or when wearing gloves. This requires bending over to operate and makes interlocking the inserts even more difficult, making it particularly inconvenient for the elderly and children.

[0003] In this context, magnetic zippers emerged, gradually replacing the traditional interlocking method. Magnetic zippers are named for the magnets inside. They replace the square latch of a regular zipper with a magnet, creating a circular snap similar to a clothing button. Utilizing the principle of magnetism, when the bottom stops of the zipper on both sides approach each other, the internal magnets attract them, causing the bottom stops to automatically close. Pulling the zipper head upwards then quickly closes the zipper. This allows for quick zipping regardless of whether the user is wearing gloves or wearing clothing of any thickness (such as life jackets, down jackets, or ski suits). Even in one-handed operation environments, it is easily used by people with one-handed disabilities.

[0004] In existing magnetic zipper manufacturing processes, due to injection molding issues, three fixing holes remain on the finished product components to secure the magnets. This is because previous magnetic zipper manufacturers used three fixing inserts in the mold to clamp the magnets, securing them from top to bottom during injection molding. After molding, these inserts are removed, leaving three through holes on the finished product components. Part of the magnet is visible through these holes, and over time, iron filings, metal shavings, and small metal fragments from daily life become trapped inside, making them difficult to clean and potentially causing harm. Summary of the Invention

[0005] To address the shortcomings of the aforementioned technologies, this invention provides a manufacturing process for magnetic zippers.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a manufacturing process for magnetic zippers, characterized in that the manufacturing process comprises the following steps:

[0007] a. The lower injection mold supports the magnet that forms the upper component of the magnetic zipper, and the support column of the lower injection mold fits against the magnet and restricts its radial movement;

[0008] b. Place the upper injection mold above the lower injection mold to close the mold, leaving a gap between the upper and lower molds and the magnet.

[0009] c. Liquid injection plastic is injected from bottom to top along the guide groove outside the support column of the injection mold, so that the liquid injection plastic first contacts the top surface of the magnet and spreads to fill the gap to form a uniform impact force on the magnet from top to bottom.

[0010] d. Liquid injection molding fills the mold cavity from top to bottom along the sidewall of the magnet;

[0011] e. Demolding forms the upper component of the magnetic zipper.

[0012] Furthermore, the way the support pillars of the injection mold conform to the magnet and restrict its radial movement is by having at least three support pillars evenly distributed and conforming to the circumferential periphery of the magnet, and by matching the contact surfaces of the inner walls of the support pillars with the outer walls of the magnet.

[0013] Furthermore, the lower injection mold horizontally supports the magnet of the upper component that forms the magnetic zipper.

[0014] Furthermore, the upper injection mold is placed above the lower injection mold for mold closing, and the gap between the upper mold and the magnet is left to form a gap that fully covers the top surface of the magnet.

[0015] Furthermore, the liquid injection plastic is injected from bottom to top through the guide channel outside the support column of the injection mold, which is opened on the support column to keep the liquid injection plastic away from the circumferential periphery of the magnet.

[0016] Furthermore, the top surface of the support column is designed to be flush with the top surface of the magnet, so that the liquid injection plastic first contacts the top surface of the magnet.

[0017] Furthermore, the liquid injection plastic diffuses and fills the gap between the upper and lower injection molds and the magnet after they are closed, forming a uniform impact force on the magnet from top to bottom.

[0018] Furthermore, the liquid injection molding material fills the mold cavity from top to bottom along the magnet sidewall between two adjacent support pillars, forming a complete cover of the contact surface with the magnet.

[0019] Furthermore, during the injection molding of the lower component of the magnetic zipper, the upper injection mold of the lower component uses ejector pins to press against the magnet from top to bottom during mold closing to prevent displacement.

[0020] Furthermore, the pin is positioned at the center of the upper surface of the magnet.

[0021] This invention discloses

[0022] This invention solves the problem of holes above magnetic zippers by creating a smooth, groove-free surface that completely encapsulates the magnet within the plastic. The smooth, hole-free surface makes cleaning extremely easy and harmless. Simultaneously, the fully encapsulated structure increases the distance between the surface / metal and the internal magnet, reducing the magnet's attraction. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the injection mold of the upper component of the present invention.

[0024] Figure 2 This is a schematic view of the injection molding upper mold structure of the component of the present invention.

[0025] In the diagram: 101, magnet; 201, injection port; 301, guide channel; 401, support column one; 402, support column two; 403, support column three; 501, ejector pin. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1The illustrated magnetic zipper manufacturing process aims to eliminate three through holes on the upper component. During manufacturing, the lower injection mold of the upper component horizontally supports the magnet of the upper component forming the magnetic zipper. The lower injection mold is fitted with three evenly distributed support pillars 401, 402, and 403, which are attached to the circumferential periphery of the magnet. The inner wall of each support pillar matches the contact surface of the outer wall of the magnet 101, restricting its radial movement. The upper injection mold is then placed above the lower injection mold for mold closing, leaving a gap between the upper and lower molds to fully cover the top surface of the magnet. The upper injection mold and the lower injection mold... After the lower mold is closed, a sprue 201 is reserved for injecting liquid injection plastic. The sprue 201 is aligned with one of the support pillars. In this embodiment, in order to guide the injection direction, a guide groove 301 is made on the side of the support pillar 401. The guide groove 301 is opened from top to bottom on the support pillar 401. Liquid injection plastic is injected from bottom to top along the guide groove on the outside of the support pillar of the lower injection mold. It should be understood that after the upper injection mold is closed with the lower injection mold, the guide groove 301 is used to assist in guiding the injection direction. The top surface of the support pillar is set to be flush with the top surface of the magnet so that the liquid injection plastic first contacts the top surface of the magnet, and then... The liquid injection molding compound spreads evenly outwards along the gap surface, thus subjecting magnet 101 to a uniform downward impact force and preventing displacement. This design prevents the liquid injection molding compound from directly entering the mold cavity and flowing upwards. If it were to flow upwards, the compound would first contact the bottom surface of magnet 101, lifting it upwards. Upward movement or displacement of magnet 101 would result in product defects. Subsequently, the liquid injection molding compound fills the mold cavity from top to bottom along the magnet sidewalls between adjacent support pillars, completely covering the contact surface with the magnet. The upper component of the magnetic zipper, formed by demolding, replaces the function of the three fixing magnets 101 of the original upper mold. This results in a fully covered surface for the product, eliminating the through holes left by the fixing inserts. Only the exposed part of the magnet is formed on the inner wall of the groove of the upper component. When in use, the exposed part is covered after the upper and lower components are combined, greatly reducing the probability of metal debris. Even if metal debris is attracted, it can be easily cleaned up because the groove opening of the upper component is large, making it relatively easy to clean. At the same time, the upper surface of the upper component becomes smooth and rounded, solving the problem of the holes of the fixing inserts on the upper surface.

[0028] like Figure 2 As shown, during the injection molding of the lower component, the ejector pin 501 on the upper mold of the lower component presses against the center of the upper surface of the magnet from top to bottom when the mold is closed, ensuring that the position of the internal magnet of the lower component will not shift during injection molding.

[0029] In summary, the present invention employs a manufacturing process for a magnetic zipper, which has the following advantages:

[0030] The invention eliminates the three through holes on the upper component: Traditional magnetic zippers require processing three holes in the upper component, which leads to complex processes and high production costs. The manufacturing process of this invention eliminates these holes, simplifies the production process, and reduces production costs.

[0031] Effectively fixing the magnet's position: By adding three support pillars to the lower injection mold, the radial movement of the magnet can be restricted, ensuring its position remains fixed. During injection molding, the magnet is subjected to a uniform downward impact force, preventing displacement and guaranteeing product quality.

[0032] Full-coverage injection molding: The gap formed after the upper and lower injection molds close allows the liquid injection plastic to completely cover the top surface of the magnet and fill the mold cavity along the side walls of the support pillars. This ensures complete contact between the magnet and the injection plastic, creating a fully encapsulated effect. Simultaneously, the absence of fixed insert holes results in a smooth and rounded product surface, improving product quality.

[0033] Reduced probability of metal debris: By eliminating holes, the use of fixing inserts is reduced, and the exposed part is only the exposed magnet on the inner wall of the slot, which is shielded during use, greatly reducing the probability of metal debris. At the same time, the large slot opening of the upper component is easy to clean, and metal debris and other impurities can be removed in time.

[0034] To ensure the position of the magnet inside the lower component does not shift: the ejector pin on the upper mold of the lower component presses against the center of the upper surface of the magnet when the mold is closed, ensuring that the position of the magnet inside the lower component does not shift during injection molding, thus guaranteeing product quality.

[0035] The above embodiments are not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the technical solution of the present invention are also within the protection scope of the present invention.

Claims

1. A manufacturing process for a magnetic zipper, characterized in that, The steps of the manufacturing process are as follows: a. The lower injection mold supports the magnet that forms the upper component of the magnetic zipper, and the support column of the lower injection mold fits against the magnet and restricts its radial movement; b. Place the upper injection mold above the lower injection mold to close the mold, leaving a gap between the upper and lower molds and the magnet. c. Liquid injection plastic is injected from bottom to top along the guide groove outside the support column of the injection mold, so that the liquid injection plastic first contacts the top surface of the magnet and spreads to fill the gap to form a uniform impact force on the magnet from top to bottom. d. Liquid injection molding fills the mold cavity from top to bottom along the sidewall of the magnet; e. Demolding forms the upper component of the magnetic zipper.

2. The manufacturing process of the magnetic zipper according to claim 1, characterized in that: The way in which the support columns of the injection mold conform to the magnet and restrict its radial movement is by having at least three support columns evenly distributed and conforming to the circumferential periphery of the magnet, and making the contact surface of the inner wall of the support column match the contact surface of the outer wall of the magnet.

3. The manufacturing process of the magnetic zipper according to claim 1 or 2, characterized in that: The lower injection mold horizontally supports the magnet that forms the upper component of the magnetic zipper.

4. The manufacturing process of the magnetic zipper according to claim 2, characterized in that: The process involves placing the upper injection mold above the lower injection mold to close the mold, leaving a gap between the upper mold and the magnet. This gap forms a full cover on the top surface of the magnet.

5. The manufacturing process of the magnetic zipper according to claim 4, characterized in that: The liquid injection plastic is injected from bottom to top through the guide channel outside the support column of the injection mold. This is achieved by the guide channel opened on the support column to keep the liquid injection plastic away from the circumferential periphery of the magnet.

6. The manufacturing process of the magnetic zipper according to claim 5, characterized in that: The top surface of the support column is configured to be flush with the top surface of the magnet, forming the top surface that allows the liquid injection plastic to first contact the magnet.

7. The manufacturing process of the magnetic zipper according to claim 6, characterized in that: The liquid injection molding material diffuses and fills the gap between the upper and lower injection molds and the magnet after they are closed, forming a uniform impact force on the magnet from top to bottom.

8. The manufacturing process of the magnetic zipper according to claim 7, characterized in that: The liquid injection molding material fills the mold cavity from top to bottom along the magnet sidewall between two adjacent support columns, forming a complete cover of the contact surface with the magnet.

9. The manufacturing process of the magnetic zipper according to claim 1, characterized in that: When the lower component of the magnetic zipper is injection molded, the upper injection mold of the lower component uses ejector pins on it to press the magnet from top to bottom during mold closing to prevent displacement.

10. The manufacturing process of the magnetic zipper according to claim 9, characterized in that: The pin is positioned at the center of the upper surface of the magnet.

Images