Sandwich type anti-riot zipper of center-penetrating nylon zipper and non-center-penetrating nylon zipper

Abstract

The invention provides a sandwich type anti-riot zipper of a core-penetrating nylon zipper and a core-penetrating-free nylon zipper, which comprises a double-layer toothed chain belt with an upper layer and a lower layer and a puller for the double-layer toothed chain belt to penetrate, open and close, and the double-layer toothed chain belt is formed by sewing an upper-layer chain rack and a lower-layer chain rack above and below a left cloth belt and a right cloth belt respectively. The upper-layer chain rack and the lower-layer chain rack form a left-layer toothed chain belt and a right-layer toothed chain belt respectively, the upper-layer chain rack is formed by spirally surrounding an upper-layer nylon single wire on a center penetrating wire located in the middle, and the center penetrating wire supports a spiral inner hole formed by winding the upper-layer nylon single wire. The middle of the spiral inner hole formed by winding the lower layer nylon single wire is not provided with a center penetrating wire or is provided with a thin center penetrating wire which does not support the spiral inner hole. The tooth staggering phenomenon during tooth combination is improved, and the flexibility of the lower-layer chain rack is improved.

Description

Technical Field

[0001] The invention relates to the field of zippers, in particular to an anti-riot zipper. Background Art

[0002] like Figure 1 The figure shows a sandwich-type double-layer tooth zipper of the prior art with the same width at the top and the bottom. When the upper and lower chain teeth are sewed and tightened at one time by a sewing needle with a stitching thread 10, a double-layer tooth structure is formed, which is referred to as "sandwich stitching".

[0003] The double-layer toothed chain belt comprises an upper and lower layer, and a slider 2 for inserting and opening the double-layer toothed chain belt. The double-layer toothed chain belt is respectively sewn with an upper chain tooth bar 4 and a lower chain tooth bar 5 above and below the left and right cloth tapes 3, to form a left and right double-layer toothed chain belt, respectively. The upper chain tooth bar 4 is formed by an upper nylon single thread 8 spirally wound around a threading line 71 located in the middle, and the threading line 71 supports a spiral inner hole formed by the upper nylon single thread 8 (that is, the upper nylon single thread 8 contacts the threading line 71 on both sides), and the lower chain tooth bar 5 is formed by a lower nylon single thread 9 spirally wound around a threading line 72 located in the middle, and the threading line 72 supports a spiral inner hole formed by the lower nylon single thread 9 (that is, the lower nylon single thread 9 contacts the threading line 72 on both sides).

[0004] In order to make the slider 2 be easily and smoothly pulled regardless of whether it is in the straight position or the curved position of the zipper, the applicant has improved the explosion-proof zipper with a wide top and a narrow bottom (201621077003.6, a sandwich-type explosion-proof zipper with a through-the-heart and a non-through-the-heart nylon zipper) based on the above-mentioned prior art. Figure 2 As shown:

[0005] The double-layer toothed chain belt also includes an upper and lower layer, and a slider 2 for inserting and opening the double-layer toothed chain belt. The double-layer toothed chain belt is respectively sewn with an upper chain tooth bar 4 and a lower chain tooth bar 5 above and below the left and right cloth tapes 3, forming a left and right double-layer toothed chain belt respectively. The upper chain tooth bar 4 is spirally wound by an upper nylon single wire 8 around a through-wire 71 in the middle, and the through-wire 71 supports a spiral inner hole formed by the upper nylon single wire 8 (that is, the upper nylon single wire 8 contacts the through-wire 71 on both sides), and the lower chain tooth bar 5 is spirally wound by a lower nylon single wire 9 around a through-wire 72 in the middle, and the through-wire 72 supports a spiral inner hole formed by the lower nylon single wire 9 (that is, the lower nylon single wire 9 contacts the through-wire 72 on both sides).

[0006] The improvements are:

[0007] The width of the lower sprocket bar 5 when the teeth are closed is smaller than the width of the upper sprocket bar 4 when the teeth are closed. The pitch of the spiral lines on the upper and lower sprocket bars 4 and 5 is the same, and the upper and lower layers are aligned to ensure that when the upper and lower sprocket bars 4 and 5 are sewn to the fabric tape 3, the sewing needle and the sewing thread 10 are smoothly inserted into the gap of the spiral line. The diameter of the lower nylon single thread 9 of the lower sprocket bar 5 is smaller than the diameter of the upper nylon single thread 8 of the upper sprocket bar 4.

[0008] like Figure 3 The slider 2 shown includes an upper cover plate 11 and a lower cover plate 12. Side guard plates 13 are provided on the left and right sides of the upper cover plate 11 and the lower cover plate 12. The side guard plates 13 at the front end parts of the left and right sides of the upper cover plate 11 and the lower cover plate 12 are all bell-mouthed. The opening end of the bell-mouthed is the tooth line of the corresponding chain rack bar, and the tooth line of the upper chain rack bar 4 on the upper cover plate 11 does not overlap with the tooth line of the lower chain rack bar 5 on the lower cover plate 12. The upper cover plate 11 and the lower cover plate 12 are connected by a base core 14. A tongue-shaped guide plate 15 perpendicular to the base core 14 is fixed on the base core 14. The tongue-shaped guide plate 15 plays a role in separating and guiding the upper chain rack bar 4 and the lower chain rack bar 5. Four arc-shaped surfaces 16 matching the upper chain rack bar 4 and the lower chain rack bar 5 are provided on the upper and lower sides of the left side and the upper and lower sides of the right side of the tongue-shaped guide plate 15. An upper cavity 17 for accommodating the upper chain rack 4 is formed between the tongue-shaped guide plate 15 and the upper cover plate 12, and a lower cavity 18 for accommodating the lower chain rack 5 is formed between the tongue-shaped guide plate 15 and the lower cover plate 12. The outer width C of the lower cover plate 12 is smaller than the outer width D of the upper cover plate 12, and the lower cavity 18 is narrower and shorter than the upper cavity 17, and the lower cavity 18 and the upper cavity 17 are symmetrical about the left and right centers, respectively.

[0009] In the implementation of the above technical solution, some users reported that when the zipper is torn apart and sewn on the box shell and then put together to thread the head, inexperienced workers often cause the head to be "misaligned", with the upper chain teeth being normal, while the lower chain teeth are misaligned. This phenomenon is easy to cause the teeth to burst when pulling and sliding at the corners of the bag, and the slider must be removed and re-threaded.

[0010] After research, it was found that the "sandwich stitching" is linked when the double-layer racks are opened or closed. As the saying goes, one move affects the whole body. Therefore, the matching of the compatible space between the double-layer teeth and the inner cavity of the slider is further studied to obtain the tolerance space of the slider mouth height corresponding to the thickness of the double chain rack, which is the main cause of the misaligned teeth. However, when the slider mouth height is corrected and reduced to make the tolerance of the slider inner cavity to the double-layer teeth limit space smaller, it causes the sliding degree to be tight, especially at the corners of the luggage. The reason is that the lower chain rack at the corner forms an arc-shaped reverse curvature effect at the corner, which squeezes the lower teeth together, and because the lower rack is tied together by the through-thread and the suture, the movement between the teeth in the slider inner cavity is less flexible. Summary of the invention

[0011] The invention provides a sandwich-type anti-riot zipper of a through-the-core nylon zipper and a non-through-the-core nylon zipper, which aims to solve the disadvantages of the prior art, improve the phenomenon of misaligned teeth when teeth are engaged, and improve the flexibility of the lower chain rack.

[0012] The technical solution adopted by the present invention to solve its technical problem is:

[0013] A sandwich-type anti-riot zipper with a through-the-core and non-through-the-core nylon zipper.

[0014] The invention comprises a double-layer toothed chain belt with upper and lower layers, and a puller for inserting and opening the double-layer toothed chain belt. The double-layer toothed chain belt has upper chain teeth and lower chain teeth sewn above and below the left and right cloth belts, respectively, to form left and right double-layer toothed chain belts, respectively. The upper chain teeth are spirally wound around the threading line in the middle by the upper nylon single wire, and the threading line supports the spiral inner hole wound by the upper nylon single wire. The invention is characterized in that:

[0015] The lower chain tooth bar is formed by spirally winding a lower nylon single wire, and the middle of the spiral inner hole formed by winding the lower nylon single wire has no through-wire or has a thin through-wire that does not support the spiral inner hole.

[0016] The width of the lower chain tooth bar when the teeth are closed is smaller than the width of the upper chain tooth bar when the teeth are closed. The pitch of the spiral lines on the upper and lower chain tooth bars is the same, and the upper and lower layers are aligned to ensure that when the upper and lower chain tooth bars are sewn to the fabric tape, the sewing needle and the sewing thread can be smoothly inserted into the gaps in the spiral lines.

[0017] The diameter of the lower layer nylon single wire is smaller than the diameter of the upper layer nylon single wire.

[0018] The slider includes an upper cover plate and a lower cover plate, side guard plates are provided on the left and right sides of the upper cover plate and the lower cover plate, the upper cover plate and the lower cover plate are connected by a base core, a tongue-shaped piece is fixed on the base core for separating and guiding the upper chain rack bar and the lower chain rack bar to pass through, an upper cavity for accommodating the upper chain rack bar is formed between the tongue-shaped piece and the upper cover plate, a lower cavity for accommodating the lower chain rack bar is formed between the tongue-shaped piece and the lower cover plate, and the outer width of the lower cover plate is smaller than the outer width of the corresponding upper cover plate.

[0019] The side guards at the front ends of the left and right sides of the upper and lower cover plates are both bell-mouthed, and the opening ends of the bell-mouthed are the tooth lines of the corresponding chain teeth, while the tooth lines of the upper chain teeth on the upper cover plate do not overlap with the tooth lines of the lower chain teeth on the lower cover plate.

[0020] The seams and the surface of the lower tooth chain teeth are covered with a clear lacquer layer.

[0021] The head width of the lower tooth chain is greater than the head width of the upper tooth chain, and the stitching adopts a two-needle or three-needle stitching form.

[0022] The lower tooth chain is wrapped by a TPU hot-melt soft rubber layer, and the cloth belt is covered with a TPU hot-melt soft rubber layer.

[0023] The present invention is beneficial in that:

[0024] The present invention removes the threading line from the lower teeth, which can increase the flexibility of the lower teeth to adjust forward, backward, left and right in the inner cavity of the slider, and the power source is the upper teeth fixed by the slit bundle, which drives the lower teeth to open and close. Because there is no threading line in the lower chain rack, the thickness of the teeth can be reduced, and the degree of the reverse curvature of the teeth when used at the corner can also be controlled by the shape space of the inner cavity of the slider. In addition, because the threading line causes the lower chain rack to be tightened at the corner due to the reverse curvature factor, the opening angle of the lower chain rack is larger, and the phenomenon of misalignment when closing the teeth is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a cross-sectional view of a sandwich-type double-layer tooth zipper with the same width at the top and bottom of the prior art;

[0027] Figure 2 It is a cross-sectional view of a conventional explosion-proof double-layer tooth zipper with a wide top and a narrow bottom, sewn on a suitcase;

[0028] Figure 3 is a front view of the slider of the present invention;

[0029] Figure 4 is a schematic diagram of a slider with an anti-slip wall;

[0030] Figure 5 It is a cross-sectional view of the explosion-proof double-layer tooth zipper with a width on the top and a narrowness on the bottom of the present invention sewn on a suitcase;

[0031] Figure 6 It is an enlarged top view of the upper chain state of the explosion-proof double-layer tooth zipper of the present invention, which is wide at the top and narrow at the bottom, when the teeth are engaged;

[0032] Figure 7 It is an enlarged top view of the state of the lower chain of the explosion-proof double-layer tooth zipper of the present invention, which is wide at the top and narrow at the bottom, when the teeth are engaged;

[0033] Figure 8 It is a front view of the combination of the upper wide and lower narrow explosion-proof double-layer tooth zipper and hot-melt soft adhesive of the present invention.

[0034] Fig. 9 The present invention is a cross-sectional view of a sandwich-type double-layer tooth zipper with the same width at the top and the bottom. DETAILED DESCRIPTION

[0035] In order to more clearly illustrate the technical solution of the present invention, the following will briefly introduce the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without creative work. In order to facilitate the understanding of the present invention, the present invention is described in more detail below in combination with the drawings and specific embodiments.

[0036] It should be noted that when an element is described as being "fixed to" another element, it may be directly on the other element, or one or more centered elements may exist therebetween. When an element is described as being "connected" to another element, it may be directly connected to the other element, or one or more centered elements may exist therebetween. The terms "upper", "lower", "inner", "outer", "bottom", etc. used in this specification indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc., etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] like Figure 5 , Figure 6 , Figure 7 As shown:

[0038] The double-layer toothed chain belt comprises an upper and lower layer, and a slider 2 for inserting and opening the double-layer toothed chain belt. The double-layer toothed chain belt has an upper chain tooth bar 4 and a lower chain tooth bar 5 sewn above and below the left and right cloth tapes 3, respectively, to form a left and right double-layer toothed chain belt, respectively. The upper chain tooth bar 4 is formed by an upper nylon single thread 8 spirally wound around a threading line 71 located in the middle, and the threading line 71 supports the spiral inner hole formed by the upper nylon single thread 8 (that is, the upper nylon single thread 8 is in contact with the upper and lower sides of the threading line 71).

[0039] The width of the lower chain rack bar 5 when the teeth are closed is smaller than the width of the upper chain rack bar 4 when the teeth are closed. The pitch of the spiral lines on the upper and lower chain rack bars 4, 5 are the same, and the upper and lower layers are aligned to ensure that when the upper and lower chain rack bars 4, 5 are sewn to the cloth tape 3, the sewing needle and the suture thread 10 can be smoothly inserted into the gap of the spiral line.

[0040] The improvement of the present invention is that the lower chain tooth bar 5 is spirally surrounded by the lower nylon single wire 9, and there is no threading wire in the middle of the spiral inner hole formed by the lower nylon single wire 9.

[0041] The lower tooth chain 5 is replaced with a chain tooth without a threading line, which not only saves the threading line but also obtains a better horizontal position activity space. At the same time, the thickness of the lower chain tooth 5 can be reduced, and the space for up and down shaking in the inner cavity of the slider can be reduced. Because there is no threading line in the lower chain tooth 5, the thickness of the teeth can be reduced, and the degree of the reverse curvature of the teeth when used at the corner can also obtain a higher degree of activity flexibility under the control of the shape space of the inner cavity of the slider. In addition, because the threading line will cause the lower chain tooth to be tightened at the corner due to the reverse curvature factor, the opening angle of the lower chain tooth is larger, and the phenomenon of misalignment when the teeth are engaged can be improved.

[0042] Another method is to prevent the non-through-the-core chain teeth from bursting when the non-through-the-core chain teeth are folded, such as when the crop bags are used, by adding a smaller and thinner through-the-core thread than the original through-the-core thread when the non-through-the-core chain teeth are formed, that is, the lower chain teeth 5 are spirally wound around the through-the-core thread by the lower nylon single wire 9, but the through-the-core thread does not support the spiral inner hole formed by the lower nylon single wire 9 (that is, the lower nylon single wire 9 is in contact with the through-the-core thread 9 on one side at most), and can be used as a weak point to resist bursting when the zipper is folded. And the horizontal displacement elastic activity of the teeth is still maintained, such as using a No. 3 through-the-core thread for a No. 8 specification.

[0043] In order to ensure that the tooth heads can resist falling out of the seams due to extreme continuous twisting and pulling by humans, transparent varnish can be applied or sprayed on the lower tooth chain 5 during the drying and ironing process after dyeing, and the seam 10 and the tooth body surface of the lower tooth chain 5 can be covered and dried. This can prevent the seam from being worn and stabilize the chain body from being excessively twisted to prevent the tooth heads from falling out of the seams.

[0044] The head width of the lower tooth chain 5 without a through-line is slightly larger than the head width of the upper chain tooth 4 with a through-line. In the sewing process, in order to restrain the suture, the suture 10 can also be sewn in a three-needle style to increase stability.

[0045] The tensile strength of nylon zippers with fillercord and without fillercord is similar under lateral tensile force. The difference is that when clothes or bags are folded and placed, nylon zippers with fillercord are more stable and will not burst open at the folding point because the zipper is also folded. However, nylon zippers without fillercord will easily burst open at the folding point. Therefore, the tensile strength after folding is the biggest difference. In addition, all traditional zippers have almost no resistance to vertical sharp objects piercing according to the gearing function. If you want to prevent the vertical piercing force from not separating, you must have a lower layer of padding to prevent the left and right meshing chain teeth from sinking in a "V" shape due to the vertical piercing force. In this way, there will be no "V" sinking, and there will be support to resist vertical piercing. In fact, it is the lateral tensile force from the left and right teeth of the lower chain teeth biting each other. Therefore, it can be known that for the double-layer tooth explosion-proof structural design, there is no difference in the lateral tensile strength when the lower chain rack adopts a zipper with a filler cord or without a filler cord. On the contrary, the filler cord is saved for the filler cord. Therefore, the cost is lower and the physical phenomenon of the reverse curvature of the left and right racks at the corners causes the lower chain teeth and the center core to squeeze each other. Because there is no restraint of the filler cord, the movement of closing and opening the teeth can be more flexible under the limit of the inner cavity of the slider. In addition, the disadvantage of folding strength is eliminated by sewing the upper layer of the filler cord chain / left and right cloth belts / lower layer without the filler cord chain together in a one-time sewing. This single without the filler cord chain structure eliminates the lateral tensile strength when folded because the upper layer of the filler cord chain is sandwich-sewn together, which is reinforced by the upper layer of the filler cord chain. The chain belt of this structure can be used for sewing bags or tents, and the front and back sides can be selected for sewing according to the positive and negative curvature of the corner.

[0046] The structure of the pull head:

[0047] like Figure 2 The slider 2 shown includes an upper cover plate 11 and a lower cover plate 12, and side guard plates 13 are provided on the left and right sides of the upper cover plate 11 and the lower cover plate 12. The side guard plates 13 at the front end parts of the left and right sides of the upper cover plate 11 and the lower cover plate 12 are both bell-mouthed, and the open ends of the bell-mouthed are the tooth lines of the corresponding chain teeth, and the tooth lines of the upper chain teeth 4 on the upper cover plate 11 do not overlap with the tooth lines of the lower chain teeth 5 on the lower cover plate 12. The upper cover plate 11 and the lower cover plate 12 are connected by a base core 14, and a tongue-shaped guide piece 15 perpendicular to the base core 14 is fixed on the base core 14, and the arrangement is such that the horizontal position of the cloth belt when the chain belt structure is compared with the inner cavity of the slider is the center position of the tongue-shaped guide piece 15, and the shape is slightly wider near the base core and slightly narrower far from the base core.

[0048] The tongue-shaped guide piece 15 is used to separate and guide the upper chain rack bar 4 and the lower chain rack bar 5. Four arc-shaped surfaces 16 matching the upper chain rack bar 4 and the lower chain rack bar 5 are provided on the upper and lower sides of the left side and the upper and lower sides of the right side of the tongue-shaped guide piece 15. An upper cavity 17 for accommodating the upper chain rack bar 4 is formed between the tongue-shaped guide piece 15 and the upper cover plate 12, and a lower cavity 18 for accommodating the lower chain rack bar 5 is formed between the tongue-shaped guide piece 15 and the lower cover plate 12. The outer width C of the lower cover plate 12 is smaller than the outer width D of the upper cover plate 12, and the lower cavity 18 is narrower and shorter than the upper cavity 17, and the lower cavity 18 and the upper cavity 17 are respectively symmetrical about the left and right centers.

[0049] In the present invention, the tongue-shaped guide piece 15 on the inner cavity base core 14 of the slider 2 must be further adjusted from the original position near the middle of the length of the base core 14, and the tongue-shaped guide piece 15 is located below the middle line of the base core 14 to adapt to the position of the cloth tape 3 in the horizontal position of the double layer with a wide upper layer and a narrow lower layer, so as to be used as a guide for smooth threading.

[0050] When the single-side width and combined width of the upper and lower chain teeth are almost the same after dyeing, the thickness of the slider base (connecting the upper and lower covers of the slider) is the same, so that the opening angle of the zipper in the slider is the same for the upper and lower layers.

[0051] When the single-side tooth width and combined tooth width of the upper chain teeth are large, and the single-side tooth width and combined tooth width of the lower layer are small, the inner cavity and outer shape of the slider are designed to be wide at the top and narrow at the bottom. The lower cavity of this slider shape is narrower, so it can avoid the lining of the luggage, and the wrinkles at the corners of the luggage will not bite into the slider cavity.

[0052] For the non-through sprockets that are wide at the top and narrow at the bottom, since the lower sprocket 5 is a non-through sprocket, its thickness after closing can be thinner than the upper sprocket 4 with through. Therefore, the design of the lower cavity of the slider is based on the tongue-shaped guide piece 15 on the base 14 as the horizontal line to the inner cavity surface of the lower cover plate 12 of the slider 2. The cavity opening height of the lower half will be slightly lower than the cavity opening height of the inner cavity that is wider at the upper half. The difference in the reduction is the thickness of the upper sprocket 4 with through minus the thickness of the lower sprocket 5 without through as the basic reference value.

[0053] Compared with the prior art, the outer cavity of the lower half of the slider 2 of the present invention is thinner and more protected at the corners of the bag so as not to bite the wrinkles inside, causing the slider to be pulled and then burst.

[0054] Regarding the chain belt structure with the through-chain on the upper layer and no through-chain on the lower layer, and the left and right cloth tapes sewn together by the needle through-chain in the middle, when the slider 2 is used to open and close the teeth, because the lower chain tooth bar 5 has no through-chain line, the lower cavity 18 can be appropriately narrowed compared to the upper cavity 17 to ensure that the teeth of the lower chain tooth bar 5 can intersect the teeth of the left and right opposite teeth at a deeper depth to avoid the new function of twisting and pulling the teeth. At the same time, because the lower half of the slider 2 is narrowed, it can be ensured that the inner wrinkles at the corners of the luggage will not be bitten and blocked by the gap between the slider cloth seams. It also saves the cost of the slider material. That is, the sandwich-type chain belt with the same width on the upper and lower layers has smoother lateral movement of the teeth and sutures because the lower chain has no through-chain, so after matching with the slider cavity with a wide upper and narrow lower part, it is possible to make the intersect depth of the left and right teeth of the lower chain tooth bar 5 deeper and ensure that the teeth at the corners of the luggage are pulled more smoothly.

[0055] like Figure 8 As shown: the chain belt without the through-core layer is turned upside down and then covered with the TPU hot melt soft adhesive extruded by the extruder, and then the glue is pressed and molded to penetrate into each tooth space and fill the surface with a thin TPU hot melt soft adhesive layer 50 of about 0.2-0.35mm. After the plastic is cooled, the thin layer is cut from the center to separate the left and right chain tooth belts to achieve both explosion-proof and waterproof functions. That is, the lower tooth chain 5 is wrapped by the TPU hot melt soft adhesive layer 50, and the cloth belt 3 is also covered with the TPU hot melt soft adhesive layer 50.

[0056] like Figure 4 As shown:

[0057] When the two sliders 2 are facing each other, the two hanging holes 20 will overlap and expose the hanging hole of the padlock handle to fit the padlock. For soft bags, an anti-slip wall 21 can be added to the upper surface of the slider 2 on the outside of the hanging hole 20, that is, a partition wall is set at a proper distance. The function of the anti-slip wall 21 is that when the two opposing sliders 2 are pulled together and the two opposing hanging holes 20 are intersected at the same level, the two anti-slip walls 21 just serve as the left and right outer sides of the hanging hole 20 for protection ( Figure 4 Only the anti-slip wall 21 on one slider 2 is shown, and the other slider 2 also has an anti-slip wall 21 corresponding to the anti-slip wall 21. Once the handle of the padlock passes through the hanging hole 20 and is locked, the anti-slip wall 21 makes it impossible for the soft surface leather material to be pinched and pulled apart from the outer side of the intersection of the two opposing sliders to steal the contents of the bag, so that better results are achieved in preventing explosions, thefts, and pickpocketing.

[0058] like Fig. 9 As shown:

[0059] The present invention can also be used for the lower chain tooth of a sandwich-type explosion-proof zipper with the same upper and lower chain tooth strips and the same width. That is, the upper wide and lower narrower present invention has a greater cost advantage in terms of cost and use at a curved corner. The narrower width of the lower half of the slider can also prevent the slider from biting the inner lining of the bag when it is pulled and slid.

[0060] When used for crop bags, since the bags are basically reversed when folded and stacked, there is no problem if there is no through-chain teeth on the bottom layer. However, when the folding is oblique or reversed and the bottom teeth are turned up and folded with a positive curvature, a small through-chain wire must be added to the non-through-chain teeth to help restrain and resist tooth bursting. This method can only be used when the bottom chain teeth are reversed as the upper layer and the through-chain teeth are the lower layer.

[0061] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other. The above description of the disclosed embodiments enables professionals and technicians in this field to implement or use the present invention. Various modifications to these embodiments will be obvious to professionals and technicians in this field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this article, but will comply with the widest range consistent with the principles and novel features disclosed herein.

Claims

1. A sandwich-type anti-riot zipper of through-core and non-through-core nylon zippers, comprising a double-layer toothed chain belt with upper and lower layers, and a slider for the double-layer toothed chain belt to be inserted and opened and closed. The double-layer toothed chain belt has upper chain teeth and lower chain teeth sewn above and below the left and right cloth belts, respectively, to form left and right double-layer toothed chain belts, respectively. The upper chain teeth are spirally wound around the through-core wire located in the middle by the upper nylon single wire, and the through-core wire supports the spiral inner hole formed by the upper nylon single wire, characterized in that : The lower chain tooth bar is formed by spirally winding a lower nylon single wire, and the middle of the spiral inner hole formed by winding the lower nylon single wire has no through-wire or has a thin through-wire that does not support the spiral inner hole.

2. A sandwich-type anti-riot zipper of a through-the-core and non-through-the-core nylon zipper as claimed in claim 1, characterized in that: The width of the lower chain tooth bar when the teeth are closed is smaller than the width of the upper chain tooth bar when the teeth are closed. The pitch of the spiral lines on the upper and lower chain tooth bars is the same, and the upper and lower layers are aligned to ensure that when the upper and lower chain tooth bars are sewn to the fabric tape, the sewing needle and the sewing thread can be smoothly inserted into the gaps in the spiral lines.

3. The sandwich-type anti-riot zipper of a through-the-core and non-through-the-core nylon zipper as claimed in claim 1, characterized in that: The slider includes an upper cover plate and a lower cover plate, side guard plates are provided on the left and right sides of the upper cover plate and the lower cover plate, and a base core is used to connect the upper cover plate and the lower cover plate. An upper cavity for accommodating an upper chain rack and a lower cavity for accommodating a lower chain rack are formed in the slider, and an outer width of the lower cover plate is smaller than an outer width of the corresponding upper cover plate.

4. The sandwich-type anti-riot zipper of a through-the-core and non-through-the-core nylon zipper as claimed in claim 1, characterized in that: The side guards at the front ends of the left and right sides of the upper and lower cover plates are both bell-mouthed, and the opening ends of the bell-mouthed are the tooth lines of the corresponding chain teeth, while the tooth lines of the upper chain teeth on the upper cover plate do not overlap with the tooth lines of the lower chain teeth on the lower cover plate.

5. The sandwich-type anti-riot zipper of a through-the-core and non-through-the-core nylon zipper as claimed in claim 1, characterized in that: The seams and the surface of the lower tooth chain teeth are covered with a clear lacquer layer.

6. The sandwich-type anti-riot zipper of a through-the-core and non-through-the-core nylon zipper as claimed in claim 2, characterized in that: The head width of the lower tooth chain is greater than the head width of the upper tooth chain, and the stitching adopts a two-needle or three-needle stitching form.

7. The sandwich-type anti-riot zipper of a through-the-core and non-through-the-core nylon zipper as claimed in claim 1, characterized in that: The lower tooth chain is wrapped by a TPU hot-melt soft rubber layer, and the cloth belt is covered with a TPU hot-melt soft rubber layer.

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