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

Abstract

The utility model 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] This utility model relates to the field of zippers, specifically an anti-riot zipper. Background Technology

[0002] like Figure 1 The image shows a sandwich-style double-toothed zipper of the prior art with the same width at the top and bottom. When the upper and lower chain teeth are sewn together by a needle through the sewing thread 10, the double-toothed structure formed by sewing and binding the upper chain teeth 4 / the fabric tape 3 on the left and right / the lower chain teeth 5 is called "sandwich sewing".

[0003] The device includes a double-layer toothed chain belt with upper and lower layers, and a pull head 2 for opening and closing the double-layer toothed chain belt. The double-layer toothed chain belt has upper chain teeth 4 and lower chain teeth 5 sewn on the top and bottom of the left and right fabric belts 3, respectively, forming left and right double-layer toothed chain belts. The upper chain teeth 4 are spirally wrapped around the center thread 71 by the upper nylon single thread 8. The center thread 71 supports the spiral inner hole formed by the upper nylon single thread 8 (that is, the upper nylon single thread 8 contacts the upper and lower sides of the center thread 71). The lower chain teeth 5 are spirally wrapped around the center thread 72 by the lower nylon single thread 9. The center thread 72 supports the spiral inner hole formed by the lower nylon single thread 9 (that is, the lower nylon single thread 9 contacts the upper and lower sides of the center thread 72).

[0004] To ensure that the zipper pull 2 ​​can be pulled easily and smoothly whether the zipper is in a straight or curved position, the applicant has improved upon the existing technology by creating a wider-at-the-top, narrower-at-the-bottom explosion-proof zipper (201621077003.6, a sandwich-style explosion-proof zipper with and without a core). Figure 2 As shown:

[0005] It also includes a double-layer toothed chain belt with upper and lower layers, and a pull head 2 for the double-layer toothed chain belt to be inserted for opening and closing. The double-layer toothed chain belt has an upper layer toothed bar 4 and a lower layer toothed bar 5 sewn on the top and bottom of the left and right fabric belts 3, respectively, forming left and right double-layer toothed chain belts. The upper layer toothed bar 4 is made of upper nylon single thread 8 spirally wrapped around the central thread 71. The central thread 71 supports the spiral inner hole formed by the upper nylon single thread 8 (that is, the upper nylon single thread 8 contacts the upper and lower sides of the central thread 71). The lower layer toothed bar 5 is made of lower nylon single thread 9 spirally wrapped around the central thread 72. The central thread 72 supports the spiral inner hole formed by the lower nylon single thread 9 (that is, the lower nylon single thread 9 contacts the upper and lower sides of the central thread 72).

[0006] The improvements are:

[0007] The width of the lower chain tooth 5 when engaged is smaller than that of the upper chain tooth 4. The pitch of the spiral lines on the upper chain tooth 4 and the lower chain tooth 5 is the same, and the upper and lower layers are aligned to ensure that when the upper chain tooth 4 and the lower chain tooth 5 are sewn onto the fabric tape 3, the needle and thread 10 can be smoothly inserted into the gaps in the spiral lines. The diameter of the lower nylon single thread 9 of the lower chain tooth 5 is smaller than the diameter of the upper nylon single thread 8 of the upper chain tooth 4.

[0008] like Figure 3 The pull handle 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 both the upper and lower cover plates 11 and 12. The front ends of the side guard plates 13 on both sides of the upper and lower cover plates 11 and 12 are flared, with the opening end of the flared end corresponding to the meshing line of the corresponding chain teeth. The meshing line of the upper chain teeth 4 on the upper cover plate 11 does not coincide with the meshing line of the lower chain teeth 5 on the lower cover plate 12. A base 14 connects the upper cover plate 11 and the lower cover plate 12. A tongue-shaped guide plate 15 perpendicular to the base 14 is fixed on the base 14, serving to separate and guide the upper chain teeth 4 and the lower chain teeth 5. The upper and lower surfaces of the left and right sides of the tongue-shaped guide plate 15 have four arc-shaped surfaces 16 that mate with the upper chain teeth 4 and the lower chain teeth 5. An upper cavity 17 is formed between the tongue-shaped guide plate 15 and the upper cover plate 12 to accommodate the upper chain teeth 4, and a lower cavity 18 is formed between the tongue-shaped guide plate 15 and the lower cover plate 12 to accommodate the lower chain teeth 5. 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. Furthermore, the lower cavity 18 and the upper cavity 17 are symmetrical about their respective centers. In practice, some users have reported that when the zipper is torn open, sewn separately onto the case, and then brought back together for threading, inexperienced or novice workers often cause "misaligned teeth" in the threading process. This results in the upper chain teeth meshing normally, while the lower chain teeth mesh with a front-to-back misalignment. This phenomenon can easily cause tooth breakage at the corners of the bag when the zipper is pulled and the teeth are pulled together, requiring the zipper pull to be removed and re-threaded.

[0009] Research revealed that the "sandwich stitching" mechanism is interconnected when the double-layered teeth open or close, affecting the entire system. Further investigation into the compatibility space between the double-layered teeth and the inner cavity of the zipper pull revealed that the tolerance space between the zipper pull opening height and the thickness of the double-chain teeth is the primary cause of misaligned teeth. However, when the zipper pull opening height is lowered to reduce the tolerance of the zipper pull inner cavity's limiting space for the double-layered teeth, the sliding becomes too tight, especially at the corners of the bag. This is because at the corners, the lower-layered chain teeth form an arc-shaped reverse curvature, causing them to be squeezed together. Furthermore, since the lower-layered teeth are bound together by the thread and stitching, the movement between the teeth within the zipper pull inner cavity is less flexible. Utility Model Content

[0010] This utility model provides a sandwich-style anti-riot zipper with both through-hole and non-through-hole nylon zippers. Its purpose is to overcome the shortcomings of the prior art, improve the misalignment phenomenon when the teeth are engaged, and increase the flexibility of the lower chain teeth.

[0011] The technical solution adopted by this utility model to solve its technical problem is:

[0012] A sandwich-style riot control zipper with both through-hole and non-through-hole nylon zippers.

[0013] The device includes a double-layer toothed chain strap with upper and lower layers, and a pull tab for opening and closing. The double-layer toothed chain strap has upper and lower chain teeth sewn onto the top and bottom of the left and right fabric strips, respectively, forming left and right double-layer toothed chain straps. The upper chain teeth are formed by a spiral of upper nylon single thread wrapped around a central thread, which supports the spiral inner hole formed by the upper nylon single thread. Its characteristic feature is:

[0014] The lower chain tooth is formed by a spiral of lower nylon single thread. The spiral inner hole formed by the lower nylon single thread has no through thread in the middle, or has a thin through thread that does not support the spiral inner hole.

[0015] The width of the lower chain teeth when they are engaged is smaller than that of the upper chain teeth when they are engaged. The pitch of the spiral lines on the upper and lower chain teeth is the same, and the upper and lower layers are aligned to ensure that when the upper and lower chain teeth are sewn onto the fabric tape, the needle and thread can be smoothly inserted into the gaps of the spiral lines.

[0016] The diameter of the lower layer nylon yarn is smaller than that of the upper layer nylon yarn.

[0017] The zipper pull includes an upper cover plate and a lower cover plate. Side guard plates are provided on the left and right sides of the upper and lower cover plates. The upper and lower cover plates are connected by a base. A tongue-shaped piece is fixed on the base to separate and guide the upper and lower chain teeth. An upper cavity for accommodating the upper chain teeth is formed between the tongue-shaped piece and the upper cover plate. A lower cavity for accommodating the lower chain teeth is formed between the tongue-shaped piece and the lower cover plate. The outer width of the lower cover plate is smaller than the outer width of the corresponding upper cover plate.

[0018] The side guards on the front ends of the upper and lower cover plates are all flared, and the opening end of the flared mouth is the meshing line of the corresponding chain tooth. However, the meshing line of the upper chain tooth on the upper cover plate does not coincide with the meshing line of the lower chain tooth on the lower cover plate.

[0019] The stitching and the surface of the teeth of the lower toothed chain are covered with a layer of transparent lacquer.

[0020] The head width of the lower chain tooth is greater than that of the upper chain tooth, and the stitching uses a two-needle or three-needle stitching method.

[0021] The lower toothed chain is wrapped with a TPU hot melt soft rubber layer, and the fabric belt is covered with a TPU hot melt soft rubber layer.

[0022] The advantages of this utility model are:

[0023] This invention removes the threaded core from the lower teeth, allowing for more flexible self-adjustment of the lower teeth within the zipper pull's internal cavity. The power source is the upper teeth, which, through the fixing of the stitching, drive the opening and closing of the lower teeth. Because there is no threaded core within the lower chain teeth, the tooth thickness can be reduced. This allows for greater flexibility in controlling the relative curvature of the teeth at bends, improving the flexibility of movement within the zipper pull's internal cavity. Furthermore, the threaded core causes tension at bends due to the reverse curvature, which can lead to a larger opening angle of the lower chain teeth and thus reduce misalignment during engagement. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a cross-sectional view of a sandwich-style double-toothed zipper with the same width at both the top and bottom.

[0026] Figure 2 This is a cross-sectional view of an existing technology of a wide-top-narrow-bottom explosion-proof double-toothed zipper sewn onto a suitcase;

[0027] Figure 3 This is a front view of the zipper pull of this utility model;

[0028] Figure 4 This is a schematic diagram of a zipper pull with anti-detachment features;

[0029] Figure 5 This is a cross-sectional view of the explosion-proof double-toothed zipper, which is wider at the top and narrower at the bottom, sewn onto a suitcase according to this utility model.

[0030] Figure 6 This is an enlarged top view of the upper chain of the explosion-proof double-toothed zipper of this utility model when the teeth are engaged;

[0031] Figure 7 This is an enlarged top view of the lower chain of the explosion-proof double-toothed zipper of this utility model when the teeth are engaged;

[0032] Figure 8 This is a front view of the explosion-proof double-toothed zipper with a wider top and narrower bottom, combined with hot melt soft adhesive, according to this utility model.

[0033] Figure 9 This is a cross-sectional view of the sandwich-style double-toothed zipper of the present invention, which has the same width at both the top and bottom. Detailed Implementation

[0034] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort. To facilitate understanding of this utility model, a more detailed description of this utility model will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0035] It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "bottom," etc., used in this specification indicate the 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, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] like Figure 5 , Figure 6 , Figure 7 As shown:

[0037] It includes a double-layer toothed chain belt with upper and lower layers, and a pull head 2 for the double-layer toothed chain belt to be inserted for opening and closing. The double-layer toothed chain belt has upper chain teeth 4 and lower chain teeth 5 sewn on the top and bottom of the left and right fabric belts 3 respectively, forming left and right double-layer toothed chain belts. The upper chain teeth 4 are spirally wrapped around the core thread 71 located in the middle by the upper nylon single thread 8. The core thread 71 supports the spiral inner hole formed by the upper nylon single thread 8 (that is, the upper nylon single thread 8 contacts the upper and lower sides of the core thread 71).

[0038] The width of the lower chain tooth 5 when the teeth are engaged is smaller than the width of the upper chain tooth 4 when the teeth are engaged. The pitch of the spiral lines on the upper chain tooth 4 and the lower chain tooth 5 is the same, and the upper and lower layers are aligned to ensure that when the upper chain tooth 4 and the lower chain tooth 5 are sewn onto the fabric tape 3, the needle and thread 10 can be smoothly inserted into the gaps of the spiral lines.

[0039] The improvement of this utility model is that the lower chain tooth 5 is spirally surrounded by the lower nylon single thread 9, and there is no through thread in the middle of the spiral inner hole formed by the lower nylon single thread 9.

[0040] The lower chain 5 is replaced with a chain tooth without a core thread, which saves on the core thread and provides better horizontal movement space. It also reduces the thickness of the lower chain tooth 5, minimizing the space for vertical movement within the slider's inner cavity. Because there is no core thread within the lower chain tooth 5, the tooth thickness can be reduced. This allows for greater flexibility in controlling the relative curvature of the teeth when using it at bends, while also allowing for better control of the slider's inner cavity shape. Furthermore, the core thread, which causes tension at bends due to its reverse curvature, thus reducing the opening angle of the lower chain tooth and improving the problem of misalignment during engagement, is a significant improvement.

[0041] Another method, when used for zippers that need to be folded, such as those used in agricultural bags, is to prevent the unpierced zipper teeth from bursting when folded back. This can be achieved by adding a smaller and finer thread than the original thread during the forming of the unpierced zipper teeth. Specifically, the lower zipper teeth 5 are spirally wrapped around the thread by the lower nylon monofilament 9. However, the thread does not support the spiral inner hole formed by the lower nylon monofilament 9 (meaning the lower nylon monofilament 9 contacts the thread on the most frequent side), thus acting as a weak point to prevent bursting when folded back. This also maintains the horizontal displacement elasticity of the meshing teeth; for example, a No. 3 thread can be used for a No. 8 specification.

[0042] To ensure that the teeth do not come off the sewing bundle under extreme continuous torsion, transparent varnish can be applied or sprayed onto the lower tooth chain 5 during the dyeing, drying and ironing process. This covers the sewing thread 10 and the tooth surface of the lower tooth chain 5 and then dries it. This can prevent the sewing thread from wearing out and stabilize the chain body from excessive torsion, preventing the teeth from coming off the sewing thread.

[0043] The head width of the lower toothed chain 5 without a core thread is slightly larger than the head width of the upper toothed chain 4 with a core thread after being punched. In terms of sewing process, in order to restrain the sewing thread, the sewing thread 10 can also adopt a three-needle sewing method to increase stability.

[0044] Under lateral tensile force, nylon zippers with and without filler cords have roughly the same tensile strength. The difference lies in how they hold their contents when clothing or bags are folded. Zippers with filler cords are more stable and won't split open at the fold, while zippers without filler cords are more prone to this. Therefore, the biggest difference is the tensile strength after folding. Furthermore, all traditional zippers, based on the gearing function, are almost entirely unable to resist a vertical puncture from a sharp object and will separate. To prevent separation due to vertical puncture force, a lower layer of padding is needed to prevent the interlocking teeth from forming a "V" shape. This lack of "V" shape provides resistance to vertical punctures and bursts. This resistance comes from the lateral tensile strength of the interlocking teeth of the lower layer. Therefore, it can be concluded that for the two-layer toothed explosion-proof structural design, there is no difference in lateral tensile strength between zippers with and without filler cords for the lower chain teeth. In fact, the zipper without filler cords saves on the filler cord. This results in lower costs, and the physical phenomenon of the reverse curvature of the left and right teeth at the bends causes the lower chain teeth and the central core to squeeze against each other. Because there is no filler cord restraint, the teeth can move more flexibly in opening and closing motions within the zipper pull's inner cavity. Furthermore, the drawback in folding strength is eliminated by stitching the upper filler chain teeth, left and right fabric strips, and lower non-filler chain teeth together with a single through-stitch. This single non-filler chain structure eliminates lateral tensile strength during folding due to the sandwich-like stitching of the upper filler chain, and is reinforced by the upper filler chain teeth. When this chain structure is used in the sewing of bags or tents, the right and wrong sides can be selected for sewing depending on the curvature of the bend.

[0045] The structure of the slider:

[0046] like Figure 2 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 both the upper and lower cover plates 11 and 12. The front ends of the side guard plates 13 on both sides of the upper and lower cover plates 11 and 12 are flared, with the opening end of the flared end corresponding to the meshing line of the corresponding chain teeth. The meshing line of the upper chain teeth 4 on the upper cover plate 11 does not coincide with the meshing line of the lower chain teeth 5 on the lower cover plate 12. The upper cover plate 11 and lower cover plate 12 are connected by a base 14. A tongue-shaped guide plate 15 perpendicular to the base 14 is fixed on the base 14. The guide plate 15 is positioned such that its center is aligned with the horizontal alignment of the fabric strip inside the slider's cavity, similar to the chain belt structure. It is slightly wider near the base and slightly narrower further from the base.

[0047] The tongue-shaped guide plate 15 separates and guides the upper chain rack 4 and the lower chain rack 5. The upper and lower left and right sides of the tongue-shaped guide plate 15 have four arc-shaped surfaces 16 that mate with the upper chain rack 4 and the lower chain rack 5. An upper cavity 17 is formed between the tongue-shaped guide plate 15 and the upper cover plate 12 to accommodate the upper chain rack 4, and a lower cavity 18 is formed between the tongue-shaped guide plate 15 and the lower cover plate 12 to accommodate the lower chain rack 5. 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. Furthermore, the lower cavity 18 and the upper cavity 17 are symmetrical about their respective centers. In this invention, the tongue-shaped guide plate 15 on the inner core 14 of the pull head 2 must be further adjusted from its original position near the middle of the length of the core 14. The tongue-shaped guide plate 15 is located below the center line of the core 14 to adapt to the position of the cloth tape 3 in a double-layer horizontal position that is wider at the top and narrower at the bottom, so as to provide guidance when smoothly threading the pull head.

[0048] When the single-side width of the upper and lower chain teeth and the width of the connecting teeth are nearly the same after dyeing, the thickness of the zipper head base (connecting the upper and lower cover plates of the zipper head) is the same, so that the opening angle of the zipper in the zipper head is the same for the upper and lower layers.

[0049] When the single-side tooth width and meshing tooth width of the upper chain teeth are large, while the single-side tooth width and meshing tooth width of the lower chain teeth are small, the design of the inner cavity and outer shape of the zipper pull is a shape that is wider at the top and narrower at the bottom. The lower cavity of this zipper pull design is narrower, thus avoiding the lining fabric of the bag and preventing it from getting caught in the zipper pull cavity at the corners of the bag.

[0050] For the top-wide, bottom-narrow type of chain toothed rack without a through-hole, since the lower chain toothed rack 5 is without a through-hole, its thickness after meshing can be thinner and flatter than the upper chain toothed rack 4 with a through-hole. Therefore, the design of the lower cavity of the slider is based on the horizontal line from the tongue-shaped guide plate 15 on the base 14 to the inner surface of the lower cover plate 12 of the slider 2. The height of the lower cavity opening will be slightly lower than the height of the wider upper cavity opening. The difference in this reduction is based on the difference between the thickness of the upper chain toothed rack 4 with a through-hole and the thickness of the lower chain toothed rack 5 without a through-hole, which serves as a basic reference value.

[0051] Compared with the prior art, the lower half of the outer cavity of the zipper 2 of this utility model is thinner and more protective, so that it will not bite the inner folds at the corners of the bag, causing resistance to the pull and causing it to burst open.

[0052] Regarding the chain structure where the cored chain is on the upper layer and the non-cored chain is on the lower layer, with left and right fabric strips sewn together in the middle, when corresponding to the zipper pull's cavity structure, because the lower chain teeth 5 do not have a cored thread, the lower cavity 18 can be appropriately narrower than the upper cavity 17 when the zipper pull 2 ​​is used for opening and closing. This ensures that the teeth of the lower chain teeth 5 can interlock more deeply, preventing twisting and tearing. At the same time, the narrower lower half of the zipper pull 2 ​​ensures that the inner folds at the corners of the bag are not caught in the gaps in the zipper pull's fabric, thus saving on zipper pull material costs. In other words, the sandwich-style chain with the upper and lower layers of the same width allows for smoother lateral movement because the lower chain has no cored thread, teeth, or stitching. Therefore, by matching the zipper pull cavity, which is wider at the top and narrower at the bottom, the interlocking depth of the left and right teeth of the lower chain teeth 5 can be increased, ensuring smoother sliding at the corners of the bag.

[0053] like Figure 8 As shown: The chain without a core layer is placed upside down and then covered with TPU hot melt soft adhesive extruded from an extruder. It is then pressed and molded, allowing the adhesive to penetrate and fill the spaces between the teeth, leaving a thin TPU hot melt soft adhesive layer 50 of approximately 0.2-0.35 mm on the surface. After the plastic material cools, the thin layer is cut open from the center to separate the left and right chain teeth, achieving both explosion-proof and waterproof functionality. That is, the lower chain teeth 5 are wrapped in TPU hot melt soft adhesive layer 50, and the fabric belt 3 is also covered with TPU hot melt soft adhesive layer 50.

[0054] like Figure 4 As shown:

[0055] When the two zipper pulls 2 are paired opposite each other, the two hook holes 20 will overlap and expose the hook hole of the padlock handle to allow the padlock to be hooked in. For soft bags, an anti-detachment wall 21 can be added to the upper surface of the zipper pull 2 ​​outside the hook hole 20, that is, a partition is set at an appropriate distance. The function of this anti-detachment wall 21 is that when the two opposing zipper pulls 2 are pulled together in opposite directions, and the two opposing hook holes 20 are at the same horizontal level, the two anti-detachment walls 21 act as the left and right outer protection of the hook hole 20. Figure 4 Only one zipper pull 2 ​​is shown as having an anti-detachment wall 21 (the other zipper pull 2 ​​also has a corresponding anti-detachment wall 21). Once the handle of the padlock is passed through the hook hole 20 and locked, the anti-detachment wall 21 prevents the soft leather material from being pulled open by pinching the fabric from the outside of the intersection of the two zipper pulls, thus preventing the theft of items from the bag. This makes the anti-explosion, anti-theft, and anti-pickpocketing effects more effective.

[0056] like Figure 9 As shown:

[0057] This invention can also be used on the lower chain teeth of a sandwich-style explosion-proof zipper with the same upper and lower chain teeth of the same width. In other words, it has a cost advantage in terms of cost and use at bends. The narrower lower part of the zipper pull also has the function of preventing the zipper pull from biting the inner lining of the bag when it is pulled.

[0058] When used for crop bags, since the bags are generally folded and stacked with a reverse curvature, the absence of a core-through chain tooth in the lower layer is not a problem. However, when the bag is folded at an angle or in reverse, causing the lower teeth to flip to the upper layer and form a positive curvature, a thin core thread must be added inside the coreless chain tooth to provide restraint and prevent the teeth from bursting. This method is only applicable when the lower chain tooth is reversed and the core chain tooth is the lower layer.

[0059] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above description of the disclosed embodiments enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sandwich type anti-burst zipper with or without a core, comprising a double-layered toothed belt with upper and lower layers, and a slider for the double-layered toothed belt to pass through for opening and closing, the double-layered toothed belt having upper and lower toothed strips respectively sewn on the upper and lower sides of left and right cloth belts to form left and right double-layered toothed belts, the upper toothed strip being formed by a helical winding of an upper nylon single thread around a core thread located in the middle, the core thread supporting a helical inner hole formed by the winding of the upper nylon single thread, characterized in that : The lower chain toothed rack is surrounded by a lower nylon single thread helix, and the helix inner hole is not provided with a core wire or is provided with a thin core wire which does not support the helix inner hole.

2. A sandwiched anti-burst zipper of the type having a core and a non-core nylon zipper as defined in claim 1, characterized in that: The width of the lower chain toothed rack when engaged is less than the width of the upper chain toothed rack when engaged, the helix pitches of the upper and lower chain toothed racks are the same, and the upper and lower layers are aligned to ensure that when the upper and lower chain toothed racks are sewn onto the cloth belt, the sewing needle and thread are smoothly inserted into the helix gap.

3. The sandwich-style anti-riot zipper with both through-hole and non-through-hole nylon zippers as described in claim 1, characterized in that: The puller comprises an upper cover plate and a lower cover plate, and side guards are arranged 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. An upper cavity for accommodating the upper chain toothed rack and a lower cavity for accommodating the lower chain toothed rack are formed in the puller. The outer width of the lower cover plate is less than the outer width of the corresponding upper cover plate.

4. The sandwich-style anti-riot zipper with both through-hole and non-through-hole nylon zippers as described in claim 1, characterized in that: The side guards of the upper and lower cover plates on the left and right sides of the front end portion are all flared mouths, the opening end of the flared mouth is the engaged tooth line of the corresponding chain toothed rack, and the engaged tooth line of the upper chain toothed rack on the upper cover plate does not coincide with the engaged tooth line of the lower chain toothed rack on the lower cover plate.

5. A sandwiched anti-burst zipper of the type having a male and a female nylon zipper as recited in claim 1, wherein: The sewing thread is covered with a transparent paint layer on the surface of the tooth body of the lower chain toothed rack.

6. The sandwich-style anti-riot zipper with both through-hole and non-through-hole nylon zippers as described in claim 2, characterized in that: The head width of the lower chain toothed rack is greater than the head width of the upper chain toothed rack, and the sewing thread adopts a two-needle or three-needle sewing form.

7. A sandwiched anti-burst zipper of the type having a male and a female nylon zipper of claim 1, wherein: The lower chain toothed rack is wrapped by a TPU hot melt soft glue layer, and the cloth belt is covered with a TPU hot melt soft glue layer.

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