CN115633832A

CN115633832A - Novel structure injection molding zipper

Info

Publication number: CN115633832A
Application number: CN202110812567.9A
Authority: CN
Inventors: 唐志强
Original assignee: Shen Zhen Hua Sheng Da Zipper Co ltd
Current assignee: Shen Zhen Hua Sheng Da Zipper Co ltd
Priority date: 2021-07-19
Filing date: 2021-07-19
Publication date: 2023-01-24

Abstract

The invention discloses an injection molding zipper with a new structure, which comprises a cloth belt (2) and zipper teeth (1), wherein the zipper teeth (1) comprise a zipper tooth body (11) positioned on the surface of the cloth belt (2) and a tooth head connecting part (12) extending along one side of the zipper tooth body (11) and exposing the cloth belt (2), the tooth head connecting part (12) is divided into a tooth head connecting part front surface (121) and a tooth head connecting part back surface (122) by taking a cloth belt surface as a center, at least one of the tooth head connecting part front surface (121) and the tooth head connecting part back surface (122) is of a hook-shaped structure, the hook directions of the tooth head connecting parts (12) on two sides of the cloth belt (2) are opposite, and one zipper tooth (1) on one side is only meshed with one zipper tooth (1) on the opposite side. The injection molding zipper with the new structure can improve the strength of the injection molding zipper and is smooth and soft.

Description

Novel structure injection molding zipper

Technical Field

The invention relates to an injection molding zipper with a novel structure, which is stable in structure, improved in strength, smooth and flexible.

Background

The zippers are classified by materials and are divided into nylon zippers, injection molding zippers and metal zippers, wherein the injection molding zippers are rich and colorful in color and luster, tough in texture, wear-resistant and corrosion-resistant, and are popular with bag and clothing customers. However, in the conventional injection molded slide fastener in the market, when the left and right fastener elements 1 are engaged, as shown in fig. 12, the element head connecting portion 12 of one fastener element 1 on each side of the slide fastener is inserted between two adjacent fastener elements 1 on the opposite side to form engagement. This is true for each tooth element 1. The engagement of the embedding mode determines that the current injection-molded zipper has structural defects: that is, in order to improve the bonding strength of the left and right sides of the injection molded zipper, the size of the element head connecting part 12 of the zipper teeth 1 needs to be increased, but after the size of the element head connecting part 12 is increased, the element head connecting part 12 is difficult to be embedded during the zipper teeth engagement, even if the element head connecting part is embedded reluctantly, the zipper is pulled unsmoothly, and the smoothness of the zipper is seriously affected, and the injection molded zipper of the combination mode has the mutual transmission of the engagement acting force between the zipper teeth 1 after the engagement, so that the zipper after the size of the element head connecting part 12 is increased is stiff and stiff, the sewing of the garment is seriously affected, and even the whole effect of the garment is affected. On the other hand, if the smooth performance of the engagement of the injection molded slide fastener is to be improved, the size of the element connecting portion 12 needs to be reduced, but the size of the element connecting portion 12 can be reduced to allow the fastener to be smoothly engaged, but the coupling strength of the engaged slide fastener cannot be ensured, and even the slide fastener is likely to be cracked after the engagement. Although the balance point of the size of the tooth head connecting part 12 can be found by considering the mutual influence of the strength and the smoothness of the zipper, the bonding strength of the left side and the right side of the injection-molded zipper based on the balance point is always the quality hidden trouble of the zipper, and the further development of the zipper is also restricted.

Therefore, the strength of the injection-molded zipper is improved, and the smoothness of the injection-molded zipper is improved, which is an urgent need of enterprises and customers in the zipper industry, but the teeth head of one zipper tooth 1 on one side of the existing zipper is embedded between two adjacent zipper teeth 1 on the opposite side to form the meshed injection-molded zipper, so that the obvious structural defect exists.

Disclosure of Invention

Based on the defects of the existing injection-molded zipper, the invention aims to provide an injection-molded zipper with a novel structure, wherein one zipper tooth 1 on one side is meshed with one zipper tooth 1 on the opposite side. The injection molding zipper with the new structure can improve the strength of the injection molding zipper and is smooth and soft.

The invention aims to be realized by the following technical scheme:

the utility model provides a zipper is moulded plastics to new construction, contain strap 2 and chain tooth 1, chain tooth 1 contains the chain tooth body 11 that is located the strap 2 surface and extends and expose the tooth head connecting portion 12 of strap 2 along 11 a side of chain tooth body, tooth head connecting portion 12 uses the strap face to divide into tooth head connecting portion front 121 and tooth head connecting portion reverse side 122 as the center, at least one personally submits the crotch structure in tooth head connecting portion front 121 and the tooth head connecting portion reverse side 122, the crotch opposite direction of the tooth head connecting portion 12 on two limit straps 2, when the chain tooth 1 on two limit straps 2 carries out the meshing, a certain chain tooth 1 on one side strap 2 only forms the meshing with a chain tooth 1 of opposite side strap 2.

In some embodiments, the hook-shaped structure may be a circular arc shape on the outer side, and one end of the circular arc shape is connected to one side of the fastener element body 11; the inner side of the hook-shaped structure is an S-shaped arc line, one end of the S-shaped arc line is connected with the outer side arc, and the other end of the S-shaped arc line is connected with the other side of the chain element body 11 in an arc line mode.

Preferably, the dimension T11 of the vertical portion of the S-shaped arc is one third to one half of the width dimension T1 of the tooth head connecting part 12, i.e. the vertical portion is

When the zipper teeth 1 on the two-side cloth belt 2 are engaged, the transverse distance C2 of the engaging part of the two-side zipper teeth 1 is larger than the clearance C1 between the hook outer side of the zipper teeth 1 and the opposite zipper teeth body 11.

In some embodiments, the hook-shaped structure may be a circular arc shape on the outer side, and one end of the circular arc shape is connected to one side of the fastener element body 11; the inner side of the hook-shaped structure is of a step-shaped structure, one end of the step-shaped structure is connected with the outer side in an arc shape, and the other end of the step-shaped structure is connected with the other side of the chain element body 11 in an arc manner.

In some embodiments, the hook-shaped structure may also be an arc-shaped structure, one end of the arc-shaped structure is connected to one side of the element body 11, and the inner side of the hook-shaped structure is a straight line, one end of the straight line is connected to the arc-shaped structure on the outer side of the hook, and the other end of the straight line is connected to the other side of the element body 11 in an arc manner.

Preferably, the included angle α between the straight line and the direction of coupling engagement of the coupling elements 1 on both sides of the slide fastener is less than 90 °.

In some embodiments, the fastener element bodies 11 on the left and right sides of the slide fastener are arranged in parallel, and one end of the outer arc shape of the hook-shaped structure is connected with one side of the fastener element body 11 in a straight line manner.

In some embodiments, the fastener element bodies 11 on the left and right sides of the zipper are distributed in a staggered manner, and one end of the outer arc shape of the hook-shaped structure is connected with one side of the fastener element body 11 in an arc manner.

Preferably, the element body 11 is misaligned by an amount P1 that is no more than half the pitch P2 of the elements 1, i.e., P1 < P2/2.

In some embodiments, the tooth head connecting part back surface 122 is in a hook-shaped structure, the element front surfaces are provided with a cuboid at a position corresponding to the tooth head connecting part back surface 122, the distance P4 between the cuboids of each element front surface is the same, the cuboid extends from the root of the element body front surface 111 to the tooth head connecting part front surface 121 to the top of the tooth head, a triangular cone is arranged above the top, the thickness of the cone is gradually reduced from the bottom of the cone to the top of the cone, and the vertex position of the cone is overlapped with the meshing central line a of the elements 1 on two sides of the injection-molded zipper.

The invention has the beneficial effects that:

the hook-shaped structure of the tooth head connecting part 12 enables the tooth head connecting parts 12 at two sides to be mutually buckled, and for transverse tension, the combination strength of the wide-range buckling mode is greatly improved compared with the tooth head connecting part embedding mode of the conventional injection molding zipper. Further, the lateral distance C2 of the engaging portions of the right and left elements is larger than the clearance C1 between the outside of the element hook and the opposite element body, so that the coupling of the element 1 in the longitudinal direction is stable and secured.

In addition, from the aspect of smoothness performance of the zipper, the dimension T1 of the tooth head connecting part of the left and right zipper teeth of the injection molding zipper with the novel structure is smaller than the dimension T0 of the tooth head connecting part of the two zipper teeth 1 with the traditional conventional structure, and the dimension H1 of the corresponding space into which the tooth head connecting part of the injection molding zipper needs to enter is larger than the dimension H0 of the corresponding space into which the tooth head connecting part of the traditional conventional structure needs to enter when the zipper teeth 1 on the two sides are meshed, so that the structure is certainly more convenient and easier, and is obviously smoother than the conventional structure.

Thirdly, the zipper teeth 1 of the injection molding zipper with the novel structure are combined in a mode that one zipper tooth 1 on one side is only buckled and meshed with one zipper tooth 1 on the opposite side to form a group of independent meshed zipper teeth 1; different from the meshing mode of the traditional injection molding zipper in the foregoing, the meshing relationship does not exist between each group of meshing zipper teeth 1 and the adjacent group of zipper teeth 1 in the structure, the stiff and stiff whole chain formed by the zipper teeth 1 due to the meshing acting force in the traditional meshing mode can not occur, and the zipper can be very smooth and soft after the injection molding zipper of the structure is meshed.

Drawings

FIG. 1 is a partial schematic view of a fastener element after coupling in the first embodiment.

FIG. 2 is a front view and a bottom view of a single element of the first embodiment of the fastener chain.

FIG. 3 is a partial view showing the engaged elements of the second embodiment.

FIG. 4 is a partial schematic view of a fastener element after the coupling of the fastener element in the third embodiment.

FIG. 5 is a partial schematic view of a fastener element after the coupling of the fastener element according to the fourth embodiment.

FIG. 6 is a partial schematic view of a coupling element after coupling of a slide fastener in the fifth embodiment.

FIG. 7 is a front view and a side view of a single element of the fifth embodiment fastener stringer

FIG. 8 is a view of the front fastener elements after the coupling of the fastener elements in the fifth embodiment.

FIG. 9 is a partial schematic view of a fastener element after meshing with a fastener element according to the sixth embodiment

FIG. 10 is a schematic view of the injection molded slide fastener element of the first embodiment in comparison with a conventional injection molded slide fastener element.

FIG. 11 is a schematic view showing the front fastener elements of the injection-molded slide fastener according to the sixth embodiment in comparison with the conventional injection-molded slide fastener elements.

FIG. 12 is a partial schematic view of a conventional injection molded fastener element after meshing.

The numbering in the figures illustrates:

1-element, 11-element body, 111-element body front, 112-element body back, 12-element head connecting part, 121-element head connecting part front, 122-element head connecting part back;

2-cloth belt, 31-convex body, 32-groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example one

As shown in fig. 1, the injection molded zipper of the new structure shown in the present embodiment includes a tape 2 and a fastener element 1, the fastener element 1 includes a fastener element body 11 located on the surface of the tape 2 and a fastener element connecting portion 12 extending along one side of the fastener element body 11 and exposing the tape 2, and the fastener element connecting portion 12 is divided into a fastener element connecting portion front 121 and a fastener element connecting portion back 122 by using a tape surface as a center. At least one of the front and

back sides

121 and 122 is a hook-shaped structure, for convenience of description, the front and

back sides

121 and 122 are an integral hook-shaped structure, and other combinations are exemplified in other embodiments described below. The hooking directions of the element head connecting parts 12 on the two side cloth tapes 2 are opposite, so that when the fastener elements 1 on the two side cloth tapes 2 are engaged, a certain fastener element 1 on one side cloth tape 2 is engaged with only one fastener element 1 on the opposite side cloth tape 2, but is not engaged between two fastener elements 1.

In this embodiment, the outer side of the hook-shaped structure is arc-shaped, and one end of the arc-shaped structure is connected with one side of the fastener element body 11 in a linear manner; the inner side of the hook-shaped structure is an S-shaped arc line, one end of the S-shaped arc line is connected with the outer side arc, and the other end of the S-shaped arc line is connected with the other side of the chain element body 11 in an arc line mode. The dimension T11 of the vertical part of the S-shaped arc line is one third to one half of the width dimension T1 of the tooth head connecting part 12, i.e. the dimension T1

The hook-shaped structure of the tooth head connecting part 12 enables the tooth head connecting parts 12 on two sides to be mutually buckled, the vertical height of the inner side S-shaped arc line of the whole hook is basically the effective range of transverse meshing of the chain teeth 1 on two sides of the zipper in the combined mode, and obviously, the combined strength of the large-range buckling mode is greatly improved compared with the tooth head connecting part embedding mode of the traditional conventional injection molding zipper in terms of transverse pulling force. Further, the lateral distance C2 of the engaging portions of the right and left elements is larger than the clearance C1 between the outside of the element hook and the opposite element body, so that the coupling of the element 1 in the longitudinal direction is stable and secured.

In addition, from the analysis of the smooth performance of the zipper, the smooth degree is actually the degree of difficulty of meshing the zipper teeth 1 under the pulling guide of the zipper puller, as shown in fig. 10, it is obvious that the dimension T1 of the tooth head connecting part is smaller than T0, and the dimension H1 is larger than H0 when the tooth head connecting part needs to enter the corresponding space dimensions T1 and T0 of the injection-molded zipper left and right side zipper teeth 1 with the novel structure and the two side zipper teeth 1 with the conventional structure and the meshing is required when the tooth head connecting part needs to enter the corresponding space dimensions H1 and H0, so that when the zipper teeth 1 on the two sides are meshed, the structure is certainly more convenient and easier, and is obviously smoother than the conventional structure.

As shown in fig. 1, the coupling manner of the elements 1 of the injection molded slide fastener of the new structure of the present invention is such that one element 1 of one side is engaged with only one element 1 of the opposite side to form a set of independent engaging elements 1; different from the meshing mode of the traditional injection molding zipper in the foregoing, the meshing relationship between each group of meshing zipper teeth 1 and the adjacent group of zipper teeth 1 does not exist in the structure, the stiff and stiff whole chain formed by the zipper teeth 1 due to meshing acting force in the traditional meshing mode can not occur, and the zipper can be very smooth and flexible after the injection molding zipper of the structure is meshed.

In the present embodiment, the fastener element bodies 11 on the both-side tapes 2 are set to be flush distributed. The middle layer of the outer side of the tooth head connecting part 12 is provided with a groove 32 parallel to the direction of the cloth belt 2, as shown in fig. 2, one side of the zipper tooth body 11 close to the tooth head connecting part 12 is provided with a square convex body 31, the width of the convex body 31 is smaller than that of the groove 32, the height of the convex body ensures that the zipper tooth can enter the corresponding groove when being engaged, and the transverse distance C2 of the engaged part of the left and right zipper teeth 1 is larger than the gap C1 between the hook outer side of the zipper tooth 1 and the opposite zipper tooth body 11. The square convex body 31 on one side of the meshed zipper tooth body 11 can enter the corresponding groove 32 arranged on the outer side of the hook of the opposite side tooth head, so that the left side and the right side of the meshed zipper can still not be separated when the meshed zipper is subjected to an external force vertical to the surface of the zipper.

Example two

In this embodiment, the hook-shaped structure provided in the first embodiment is further modified, as shown in fig. 3, only the "S" arc structure inside the hook of the hook-shaped structure in the first embodiment is changed into a straight line, and the rest remains unchanged. One end of the straight line is connected with the arc outside the hook, the other end of the straight line is connected with the other side of the zipper tooth body 11 in an arc line mode, and the included angle alpha between the straight line inside the tooth head connecting part 12 and the meshing connecting direction (vertical to the direction of the cloth belt 2) of the zipper teeth 1 on two sides of the zipper is smaller than 90 degrees.

In the improvement, the meshing surfaces of the zipper teeth 1 on the two sides are linear planes, so that the bonding strength of the two sides is more stable; in addition, the straight surface and the arc outside the hook of the element head connecting part 12 form a sharp angle, and obviously, the mutual meshing of the structures with sharp angles is easier than that with the arc structures, so that the meshing of the fastener elements 1 on both sides can be smoother than that in the first embodiment.

EXAMPLE III

In this embodiment, the hook-shaped structure provided in the first embodiment is further modified, as shown in fig. 4, only the "S" arc structure inside the hook of the hook-shaped structure in the first embodiment is changed into a step-shaped structure, and the rest remains unchanged. One end of the ladder shape is connected with the arc outside the hook, and the other end is connected with the other side of the chain element body 11 in an arc way.

In the embodiment, the step-shaped structure at the inner side of the hook is a deformed structure of an S-shaped arc line, after the zipper teeth are meshed, two meshing planes are arranged transversely, and one meshing plane is arranged longitudinally, so that the zipper has stable and guaranteed transverse and longitudinal bonding strength.

Example four

In this embodiment, the distribution of the fastener element bodies 11 mentioned in the first embodiment is improved, and the hook-shaped structure of the element head connecting part 12 of the fastener element 1 can be any one of the first embodiment, the second embodiment and the third embodiment or equivalent alternatives, as shown in fig. 5, the flush distribution of the fastener element bodies 11 on the left and right sides of the slide fastener is improved to be a staggered distribution, in this way, the staggered degree P1 of the fastener element bodies 11 is not more than half of the pitch P2 of the fastener elements 1, that is, P1 < P2/2.

(in this case, the dislocation means is the element body 11 on the upper side of the element head connecting part at the time of lifting engagement, and in this case, the right element 1)

One end of the outer arc of the hook-shaped structure is connected with one side of the zipper element body 11 in an arc way.

After the dislocation of this improvement chain tooth body 11 is set for, promoted the position of chain tooth body 11, like this both sides chain tooth 1 in the pulling guide process of zip fastener pull head, the meshing can be further smooth and easy.

Example five when the element is held on the reverse side of any one of the first, second and third examples or equivalent alternatives, the coupling strength of the left and right elements 1 can be ensured. The front face of the zipper element can be randomly arranged according to the requirement of attractive appearance. In this embodiment, as shown in fig. 6, under the condition that the element bodies 11 are arranged in a staggered manner, the element bodies 11 are divided into the element body front surface 111 and the element body back surface 112 with the tape surface as the center, the element head connecting portion back surface 122 and the element body back surface 112 in this embodiment adopt the configuration of the first embodiment, the second embodiment or the third embodiment, and the element front surfaces are set as follows: the front of each zipper tooth is provided with a cuboid at the position corresponding to the back surface 122 of the zipper head connecting part, namely, the front of each zipper tooth is provided with a cuboid, and the two zipper teeth 1 of each group are meshed with each other at the left side and the right side of the injection molding zipper; the distance P4 between the cuboids on the front surface of each zipper element is the same.

The cuboid extends to the top end of the tooth head from the root part of the front surface 111 of the zipper tooth body to the front surface 121 of the tooth head connecting part, a triangular cone is arranged above the top part, as shown in fig. 7, the thickness of the cone is gradually reduced from the bottom of the cone (namely, clinging to the cuboid part) to the top of the cone, and the vertex position of the cone is overlapped with the meshing central line A of the zipper teeth 1 on two sides of the injection-molded zipper.

In this embodiment, the coupling strength of the left and right fastener elements 1 can be ensured while the reverse side of the fastener elements is kept unchanged. Secondly, the front surface of the zipper teeth is set to enable the front surface of the meshed injection-molded zipper to present the obvious surface style of the metal zipper (as shown in figure 8), and the color of the injection-molded zipper is configured by toner, so that the scheme can provide customers with brand-new color series of products with the surface style of the metal zipper, which cannot be produced by the original metal zipper. Sixth embodiment this embodiment also provides an alternative to the element front mentioned in fifth embodiment, as shown in fig. 9, the element body front 111 is of a conventional structure, the embodiment improves the element head connecting portion front 121 to be a conventional oval element shape, and reduces the dimension T5 of the element head connecting portion front 121 to 80-90% of the dimension T0 of the element head of the conventional injection molded fastener element 1. (as shown in FIG. 11)

Like this, the meshing of positive chain tooth 1 can be more smooth and easy, and more important point reduces behind the tooth head size, just can not take place before the condition that chain tooth 1 is stiff and stiff, and the zip fastener is whole can be softer than originally after the meshing, and the pulling effect also can be more smooth.

As used herein, front, back, left, right, up, down are based on the viewing angle of the person, the side of the device facing the viewer is defined as front, the left side of the viewer is defined as left, and so on.

In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.

It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.

Claims

1. The utility model provides a new construction zip fastener of moulding plastics, contain strap (2) and chain tooth (1), chain tooth (1) contains chain tooth body (11) that are located strap (2) surface and extends and expose tooth head connecting portion (12) of strap (2) along chain tooth body (11) one side, tooth head connecting portion (12) use the strap face to divide into tooth head connecting portion front (121) and tooth head connecting portion reverse side (122) as the center, at least one in its characterized in that tooth head connecting portion front (121) and tooth head connecting portion reverse side (122) is personally submitted hook-like structure, the hook direction of tooth head connecting portion (12) on two limits strap (2) is opposite, when chain tooth (1) on two limits strap (2) carries out the meshing, certain chain tooth (1) on one side strap (2) only forms the meshing with a chain tooth (1) of opposite side strap (2).

2. The injection molding zipper with the new structure as claimed in claim 1, wherein the outside of the hook-shaped structure is arc-shaped, and one end of the arc-shaped is connected with one side of the zipper tooth body (11); the inner side of the hook-shaped structure is an S-shaped arc line, one end of the S-shaped arc line is connected with the outer side arc line, and the other end of the S-shaped arc line is connected with the other side of the chain element body (11) in an arc line mode.

3. A new construction injection moulded slide fastener according to claim 2, characterised in that said vertical portion of the "S" arc has a dimension T11 which is from one third to one half of the width dimension T1 of the coupling portion (12) of the tooth head

When the zipper teeth (1) on the two-side cloth belt (2) are engaged, the transverse distance C2 of the engaging part of the two-side zipper teeth (1) is greater than the clearance C1 between the hook outer side of the zipper teeth (1) and the opposite zipper tooth body (11).

4. The injection molded zipper with the new structure as claimed in claim 1, wherein the outside of the hook-shaped structure is a circular arc shape, one end of the circular arc shape is connected with one side of the zipper tooth body (11); the inner side of the hook-shaped structure is of a step-shaped structure, one end of the step-shaped structure is connected with the outer side in an arc shape, and the other end of the step-shaped structure is connected with the other side of the chain element body (11) in an arc manner.

5. The injection molded slide fastener of a new structure as set forth in claim 1, wherein the outside of said hook-shaped structure is a circular arc shape having one end connected to one side of said fastener element body (11) and the inside of said hook-shaped structure is a straight line shape having one end connected to the circular arc of the outside of the hook and the other end connected to the other side of said fastener element body (11) in an arc line.

6. A new construction of injection moulded slide fastener according to claim 4, characterised in that said straight line makes an angle α of less than 90 ° with the direction of interlocking engagement of the elements (1) on both sides of the slide fastener.

7. An injection moulded zipper as claimed in any one of claims 2 to 6, characterised in that the left and right side elements (11) of the zipper are arranged in parallel and the outer arcuate end of the hook-like formation is connected to one side of the element (11) in a straight line.

8. An injection moulded zipper as claimed in any one of claims 2 to 6, characterised in that the zipper teeth (11) on the left and right sides of the zipper are arranged in a staggered manner, the outer arcuate end of the hook-like formation being connected to one side of the zipper teeth (11) in an arcuate manner.

9. An injection-molded slide fastener of a new construction as claimed in claim 8, wherein the degree of misalignment P1 of the element body (11) is not more than half the pitch P2 of the elements (1), i.e. P1 < P2/2.

10. The injection molded zipper with the new structure as claimed in claim 1, wherein the back surface (122) of the tooth head connecting part is in a hook-shaped structure, the front surfaces of the zipper teeth are provided with a cuboid at the position corresponding to the back surface (122) of the tooth head connecting part, the distance P4 between the cuboids of each front surface of the zipper teeth is the same, the cuboid extends from the root of the front surface (111) of the zipper teeth body to the front surface (121) of the tooth head connecting part to the top end of the tooth head, a triangular cone is arranged above the top, the thickness of the cone is gradually reduced from the bottom of the cone to the top of the cone, and the vertex position of the cone is overlapped with the meshing central line A of the zipper teeth (1) at the two sides of the injection molded zipper.