A manufacturing process for an expandable zipper, zipper tape, and zipper products.

Abstract

This invention provides a manufacturing process for an expandable zipper, zipper tape, and zipper products. The expandable zipper includes a pair of zipper tapes, a pair of chain teeth installed between the two zipper tapes, and a zipper pull for separating or closing the pair of chain teeth. At least one zipper tape includes an upper tape, a middle tape, and a lower tape arranged sequentially from top to bottom. One end of the middle tape is flush with and connected to one end of the upper tape, and the other end of the upper tape extends beyond the other end of the middle tape, forming a first connecting portion for connecting the chain teeth or fabric. One end of the lower tape is flush with and connected to the other end of the middle tape, and the other end of the lower tape extends beyond the one end of the middle tape, forming a second connecting portion for connecting the fabric or chain teeth. The advantages of this invention are: it can effectively reduce implementation costs, meet the expansion needs of various single zipper products, is more suitable for practical applications, and has a wider range of applications.

Description

[Technical Field]

[0001] This invention relates to the field of zipper technology, and in particular to a manufacturing process for an expandable zipper, zipper tape, and zipper products. [Background Technology]

[0002] As people's living standards continue to improve, their demand for carrying items when going out is also increasing. In order to better meet the needs of carrying items, bags, backpacks, and handbags with expandable capacity have emerged.

[0003] Existing technologies for achieving expansion functionality require at least two zippers, with an expansion strip placed between the two zipper fabrics of at least one zipper. Expansion is achieved by opening the zipper with the expansion strip. Examples include a telescopic zipper and a double-layer telescopic zipper disclosed in Chinese invention patent application CN202410623021.2, and a zipper strip supporting a hidden connection area disclosed in Chinese utility model patent application CN202322797893.4. Both utilize an expansion strip between the two zipper fabrics to achieve expansion. However, existing expansion methods require multiple zippers, resulting in high costs and limitations on the expansion needs of single-zipper products, thus restricting their application. Furthermore, the use of multiple zippers can negatively impact the product's appearance. In light of these problems, the inventors of this case conducted in-depth research, leading to this invention. [Summary of the Invention]

[0004] The technical problem to be solved by the present invention is to provide a manufacturing process for expansion zippers, zipper tapes and zipper products, which solves the problem that the existing expansion methods require multiple zippers, which is not only costly, but also cannot meet the expansion needs of single zipper products, thus limiting the scope of application. At the same time, the setting of multiple zippers also affects the appearance of the product.

[0005] This invention is implemented as follows:

[0006] In a first aspect, an expandable zipper includes a pair of zipper tapes, a pair of chain teeth installed between the two zipper tapes, and a zipper pull for separating or closing the pair of chain teeth; at least one of the zipper tapes includes an upper tape, a middle tape, and a lower tape arranged sequentially from top to bottom;

[0007] One end of the middle layer belt is flush with and connected to one end of the upper layer belt, and the other end of the upper layer belt extends beyond the other end of the middle layer belt to form a first connecting portion for connecting the chain teeth or the fabric; one end of the lower layer belt is flush with and connected to the other end of the middle layer belt, and the other end of the lower layer belt extends beyond one end of the middle layer belt to form a second connecting portion for connecting the fabric or the chain teeth; the zipper tape can be stretched under external force to make the upper layer belt, middle layer belt and lower layer belt in a straight state.

[0008] Furthermore, each pair of zipper tapes includes an upper tape, a middle tape, and a lower tape arranged sequentially from top to bottom.

[0009] Furthermore, the chain teeth are sewn to the edge of the first connecting part by a first stitch, and the second connecting part is used to connect the fabric.

[0010] Furthermore, the dimension of the first connecting portion along the width direction of the zipper tape is greater than the dimension of the chain teeth along the width direction of the zipper tape; the dimension of the second connecting portion along the width direction of the zipper tape is 5% to 40% of the dimension of the middle layer tape along the width direction of the zipper tape.

[0011] Furthermore, the zipper tape is formed by multiple warp and weft systems interlacing to form partially overlapping and connected upper, middle, and lower tapes.

[0012] Furthermore, the zipper tape is formed by three layers of warp yarns and two layers of weft yarns interwoven to form partially overlapping and connected upper, middle, and lower tapes.

[0013] The three-layer meridian system includes the upper meridian system, the middle meridian system, and the lower meridian system; the two parallel systems include the first parallel system and the second parallel system.

[0014] The upper meridian system interweaves with the first parallel system to form the upper zone, the middle meridian system interweaves with the second parallel system to form the middle zone, and the second parallel system interweaves downwards from the edge of the middle meridian system with the lower meridian system to form the lower zone; the edge of the upper meridian system and the edge of the middle meridian system are connected by interweaving through the first parallel system.

[0015] Furthermore, the zipper tape is formed by three layers of warp and three layers of weft interlacing to form partially overlapping and connected upper, middle and lower tapes;

[0016] The three-layer meridian system includes the upper meridian system, the middle meridian system, and the lower meridian system; the three-layer parallel system includes the first parallel system, the second parallel system, and the third parallel system.

[0017] The upper meridian system interweaves with the first parallel system to form the upper zone; the middle meridian system interweaves with the second parallel system to form the middle zone; and the lower meridian system interweaves with the third parallel system to form the lower zone. The edge of the upper meridian system is connected to the edge of one side of the middle meridian system through the first parallel system, and the edge of the other side of the middle meridian system is connected to the edge of the lower meridian system through the second parallel system.

[0018] Furthermore, the upper, middle, and lower layers all employ a plain weave structure.

[0019] Secondly, a manufacturing process for zipper tape, the manufacturing process comprising the following steps:

[0020] According to the production process diagram, the first weft system and the upper warp system are interwoven together on the ribbon weaving machine to form the upper ribbon; when the first weft system moves to the last warp of the upper warp system, the first weft system is simultaneously interwoven with the edge warp of the middle warp system.

[0021] After interlacing the edges of the first parallel system with the middle meridian system, the second parallel system with the middle meridian system is interlaced to form the middle zone;

[0022] After the middle layer is woven, the second weft system is interwoven with the lower warp system to form the lower layer; or when the second weft system moves to the last warp of the middle warp system, the second weft system is interwoven with the edge warp of the lower warp system at the same time, and then the third weft system is interwoven with the lower warp system to form the lower layer.

[0023] Thirdly, a zipper product includes a bag or luggage container and the aforementioned expansion zipper, wherein the expansion zipper is disposed on the bag or luggage container.

[0024] By adopting the technical solution of the present invention, at least the following beneficial effects are achieved:

[0025] 1. The zipper tape is designed to include an upper layer tape, a middle layer tape, and a lower layer tape arranged sequentially from top to bottom. One end of the middle layer tape is flush with and connected to one end of the upper layer tape, while the other end of the upper layer tape extends beyond the other end of the middle layer tape to form a first connecting part. One end of the lower layer tape is flush with and connected to the other end of the middle layer tape, while the other end of the lower layer tape extends beyond one end of the middle layer tape to form a second connecting part. This design allows the upper, middle, and lower layers of the zipper tape to be stacked together to form an "N"-shaped structure when expansion is not required. When expansion is needed... When expanding the capacity, only an external force needs to be applied to the zipper tape along its width to stretch the upper, middle, and lower layers of the zipper tape into a straight line. Therefore, compared with the existing technology that requires multiple zippers to achieve expansion, this invention only needs one zipper to achieve the expansion function, which can effectively reduce the implementation cost and meet the expansion needs of various single-zipper products. It is more in line with practical applications and has a wider range of uses, making it an ideal new type of zipper. At the same time, it can also ensure a simpler and more beautiful appearance while achieving expansion.

[0026] 2. By interlacing the first weft system with the upper warp system to form the upper layer belt, and using the first weft system to interlac and connect the edges of the upper warp system with the edges of the middle warp system, while interlacing the second weft system with the middle warp system to form the middle layer belt, and continuing to interlacing the second weft system downwards with the lower warp system to form the lower layer belt, the upper, middle, and lower layers belts can be reliably connected together, ensuring that the entire zipper tape has strong tensile strength, thus making it suitable for various different usage environments and better meeting customer needs.

[0027] 3. By designing each pair of zipper tapes to include an upper tape, a middle tape, and a lower tape arranged sequentially from top to bottom, the expansion zipper can be stretched to a width approximately twice the width of the middle tape during actual use, thus better meeting actual expansion needs.

[0028] 4. By designing the upper, middle, and lower layers to all adopt a plain weave structure, the stability is better and the manufacturing process is more convenient. [Attached Image Description]

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Figure 1 This is an overall structural diagram of the expansion zipper of the present invention;

[0031] Figure 2 This is a diagram showing the zipper tape of the expanded zipper of the present invention in its unexpanded state.

[0032] Figure 3This is a diagram showing the unfolded state of the zipper tape of the expanded zipper of the present invention;

[0033] Figure 4 This is a schematic diagram of the interlacing structure of the warp and weft systems in the first specific embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the interlacing structure of the warp and weft systems in the second specific embodiment of the present invention;

[0035] Figure 6 This is a production process diagram of the zipper tape of the present invention;

[0036] Figure 7 This is a structural diagram of a handbag using the expansion zipper of this invention before expansion;

[0037] Figure 8 This is a structural diagram showing the connection between the expansion zipper and the fabric of the handbag in this invention;

[0038] Figure 9 This is a structural diagram of a handbag after expansion using the expansion zipper of this invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 100mm expansion zipper;

[0041] Handbag 200, fabric 201;

[0042] Zipper tape 1, upper tape 11, first connecting part 111, middle tape 12, lower tape 13, second connecting part 131;

[0043] Chain tooth row 2;

[0044] Pull head 3;

[0045] First suture 4;

[0046] Top stop 51, square pin structure 52;

[0047] Upper meridian system 61, middle meridian system 62, lower meridian system 63, meridian 641;

[0048] First parallel system 71, Second parallel system 72;

[0049] Second suture 8.

Detailed Implementation Methods

[0050] To better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] It should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing these embodiments and for 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. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. Specific Implementation Example 1

[0053] Please see Figures 1 to 5 As shown, the present invention discloses an expansion zipper 100, which includes a pair of zipper tapes 1, a pair of chain teeth 2 installed between the two zipper tapes 1, and a zipper pull 3 for separating or closing the pair of chain teeth 2. Simultaneously, each of the two zipper tapes 1 has a top stop 51 at one end on the side with the chain teeth 2, and a square pin structure 52 at the other end on the side with the chain teeth 2, to limit the zipper pull 3 using the top stop 51 and the square pin structure 52, ensuring that the zipper pull 3 does not detach. Since the chain teeth 2, zipper pull 3, top stop 51, and square pin structure 52 are all existing products, their specific structures will not be described in detail here.

[0054] At least one of the zipper tapes 1 includes an upper tape 11, a middle tape 12, and a lower tape 13 arranged sequentially from top to bottom; one end of the middle tape 12 is flush with and connected to one end of the upper tape 11, and the other end of the upper tape 11 extends beyond the other end of the middle tape 12 to form a first connecting portion 111 for connecting the chain teeth 2 or the fabric; one end of the lower tape 13 is flush with and connected to the other end of the middle tape 12, and the other end of the lower tape 13 extends beyond the one end of the middle tape 12 to form a second connecting portion 131 for connecting the fabric or the chain teeth 2, specifically: when the first connecting portion 111 connects to the chain teeth 2, the second connecting portion 131 connects to the fabric; and when the first connecting portion 111 connects to the fabric, the second connecting portion 131 connects to the chain teeth 2; the zipper tape 1 can be stretched under external force to make the upper tape 11, the middle tape 12, and the lower tape 13 in a straight state.

[0055] This invention designs the zipper tape 1 to include an upper tape 11, a middle tape 12, and a lower tape 13 arranged sequentially from top to bottom. One end of the middle tape 12 is flush with and connected to one end of the upper tape 11, and the other end of the upper tape 11 extends beyond the other end of the middle tape 12 to form a first connecting portion 111. One end of the lower tape 13 is flush with and connected to the other end of the middle tape 12, and the other end of the lower tape 13 extends beyond the one end of the middle tape 12 to form a second connecting portion 131. This design allows the upper tape 11, middle tape 12, and lower tape 13 of the zipper tape 1 to be stacked together when expansion is not required. The zipper tape 1 is shaped like an "N" and when expansion is needed, only an external force needs to be applied along its width to stretch the upper tape 11, middle tape 12, and lower tape 13 of the zipper tape 1 into a straight line. Therefore, compared with the existing technology that requires multiple zippers to achieve expansion, this invention only needs one zipper to achieve the expansion function, which can effectively reduce the implementation cost and meet the expansion needs of various single zipper products. It is more in line with practical applications and has a wider range of uses, making it an ideal new type of zipper. At the same time, it can also ensure a simpler and more beautiful appearance while achieving expansion.

[0056] In some embodiments of the present invention, in order to enable the expansion zipper 100 to expand more effectively, each pair of zipper tapes 1 includes an upper tape 11, a middle tape 12, and a lower tape 13 arranged sequentially from top to bottom. The present invention, by designing each pair of zipper tapes 1 to include an upper tape 11, a middle tape 12, and a lower tape 13 arranged sequentially from top to bottom, allows the entire expansion zipper 100 to achieve a width expansion range of approximately twice the width of the middle tape 12 during actual use, thereby better meeting actual expansion needs.

[0057] Of course, the present invention is not limited to this. In actual use, it can also be designed such that one of the zipper tapes 1 includes an upper tape 11, a middle tape 12 and a lower tape 13 arranged from top to bottom, while the other zipper tape 1 adopts the existing conventional zipper tape.

[0058] In some embodiments of the present invention, the chain tooth 2 is sewn to the edge of the first connecting portion 111 by a first seam 4 to install the chain tooth 2 onto the first connecting portion 111, and the second connecting portion 131 is used to connect the fabric. By using the first connecting portion 111 of the upper belt 11 as the connecting portion for the chain tooth 2 and the second connecting portion 131 of the lower belt 13 as the connecting portion for the fabric, the present invention ensures that after the second connecting portion 131 is sewn onto the lower surface of the fabric, the upper surface of the upper belt 11 is flush with the upper surface of the fabric, or the height difference between them is small, thus guaranteeing aesthetics. Of course, the present invention is not limited to this; in specific implementations, the first connecting portion 111 of the upper belt 11 can also be used as the connecting portion for the fabric, and the second connecting portion 131 of the lower belt 13 can be used as the connecting portion for the chain tooth 2.

[0059] In some embodiments of the present invention, the dimension of the first connecting part 111 along the width direction of the zipper tape 1 is larger than the dimension of the chain tooth row 2 along the width direction of the zipper tape, so as to better install the chain tooth row 2 and ensure that the chain tooth row 2 does not affect the stretching and unfolding of the zipper tape 1.

[0060] To facilitate a reliable connection between the second connecting portion 131 and the fabric, the dimension of the second connecting portion 131 along the width direction of the zipper tape 1 is 5% to 40% of the dimension of the middle layer tape 12 along the width direction of the zipper tape 1. Preferably, the dimension of the second connecting portion 131 along the width direction of the zipper tape 1 is 15% to 30% of the dimension of the middle layer tape 12 along the width direction of the zipper tape 1.

[0061] In some embodiments of the present invention, in order to better form a multi-layered fabric, the zipper tape 1 is formed by interlacing multiple warp systems and multiple weft systems to form partially overlapping and connected upper tape 11, middle tape 12 and lower tape 13.

[0062] Please refer to the following carefully. Figure 4 As shown, in the first specific embodiment of the present invention, the zipper tape 1 is formed by three layers of warp system and two weft system interlacing to form the upper tape 11, middle tape 12 and lower tape 13 that partially overlap and are connected.

[0063] The three-layer meridian system includes an upper meridian system 61, a middle meridian system 62, and a lower meridian system 63, and the two parallel systems include a first parallel system 71 and a second parallel system 72; wherein, the upper meridian system 61, the middle meridian system 62, and the lower meridian system 63 each include a plurality of meridians 641 arranged in a row;

[0064] The upper warp system 61 and the first parallel system 71 interweave to form the upper band 11, the middle warp system 62 and the second parallel system 72 interweave to form the middle band 12, and the second parallel system 72 interweaves downward from the edge of the middle warp system 62 with the lower warp system 63 to form the lower band 13. That is, the warp 641 on the edge of the middle warp system 62 and the warp 641 on the edge of the lower warp system 63 are connected together by the second parallel system 72 and serve as a turning point. In this way, the middle band 12 and the lower band 13 can be connected together, and folding can be achieved at the turning point. This allows the middle band 12 to be stacked on top of the lower band 13 when no expansion is needed, and can be stretched and unfolded when expansion is required.

[0065] The edges of the upper warp system 61 and the middle warp system 62 are interwoven and connected through the first weft system 71. Specifically, the warp 641 at the edge of the upper warp system 61 and the warp 641 at the edge of the middle warp system 62 are interwoven and connected together through the first weft system 71, forming another turning point. This allows for both connecting the upper band 11 and the middle band 12 and enabling folding at this other turning point. When no expansion is needed, the upper band 11 can be stacked on top of the middle band 12; when expansion is required, it can be stretched and unfolded so that the upper band 11, middle band 12, and lower band 13 are in a straight state. It should be noted that the first weft system 71 only interweaves and connects with the warp 641 at the edge of the middle warp system 62, and not with the other warp 641 of the middle warp system 62.

[0066] This invention interweaves the first weft system 71 with the upper warp system 61 to form an upper layer tape 11, and uses the first weft system 71 to interweave and connect the edges of the upper warp system 61 with the edges of the middle warp system 62. At the same time, the second weft system 72 is interweaved with the middle warp system 62 to form a middle layer tape 12, and the second weft system 72 continues to interweave downwards with the lower warp system 63 to form a lower layer tape 13. This allows the upper layer tape 11, middle layer tape 12, and lower layer tape 13 to be reliably connected, ensuring that the entire zipper tape 1 has strong tensile strength, thus making it suitable for various usage environments and better meeting customer needs. At the same time, the final zipper tape 1 also has good softness.

[0067] Please refer to the following carefully. Figure 5 As shown, in a second specific embodiment of the present invention, the zipper tape 1 is formed by three layers of warp and three layers of weft interlacing to form the partially overlapping and connected upper tape 11, middle tape 12 and lower tape 13.

[0068] The three-layer meridian system includes an upper meridian system 61, a middle meridian system 62, and a lower meridian system 63; the three parallel systems include a first parallel system 71, a second parallel system 72, and a third parallel system 73; wherein, the upper meridian system 61, the middle meridian system 62, and the lower meridian system 63 each include a plurality of meridians 641 arranged in a row;

[0069] The upper meridian system 61 interweaves with the first parallel system 71 to form the upper band 11; the middle meridian system 62 interweaves with the second parallel system 72 to form the middle band 12; and the lower meridian system 63 interweaves with the third parallel system 73 to form the lower band 13. The edges of the upper meridian system 61 and one edge of the middle meridian system 62 are connected by interweaving with the first parallel system 71, that is, the meridians 641 on the edge of the upper meridian system 61 and the meridians 641 on the edge of the middle meridian system 62 are connected by interweaving with the first parallel system 71. Together, they serve as a turning point; the other side of the middle meridian system 62 is interwoven with the side of the lower meridian system 63 through the second parallel system 72, that is, the warp 641 of the other side of the middle meridian system 62 and the warp 641 of the side of the lower meridian system 63 are interwoven together through the second parallel system 72 and serve as another turning point, so that when no expansion is needed, the upper band 11 can be stacked on top of the middle band 12, and when expansion is needed, it can be stretched and unfolded so that the upper band 11, the middle band 12 and the lower band 13 are in a straight state. It should be noted that: the first parallel system 71 only interweaves with the warp 641 of the side of the middle meridian system 62, and does not interweave with the other warp 641 of the middle meridian system 62; similarly, the second parallel system 72 only interweaves with the warp 641 of the side of the lower meridian system 63, and does not interweave with the other warp 641 of the lower meridian system 63. The second embodiment of the present invention can also ensure that the entire zipper tape 1 has strong tensile strength, so that it can be suitable for various different usage environments and better meet customer needs. The final zipper tape 1 is less soft than that of the first embodiment, but it can still fully meet the usage requirements of some occasions.

[0070] Furthermore, the upper layer 11, middle layer 12, and lower layer 13 all adopt a plain weave structure. Since the zipper tape 1 of this invention is a multi-layered fabric, if a complex weave structure is used, defects may easily occur, such as misalignment of the upper layer 11 and lower layer 13. Therefore, this invention, by designing the upper layer 11, middle layer 12, and lower layer 13 to all adopt a plain weave structure, achieves better stability and is more convenient to manufacture.

[0071] In one specific embodiment of the present invention, the upper warp system 61 includes 80 warp threads 641, the middle warp system 62 includes 56 warp threads 641, and the lower warp system 63 includes 74 warp threads 641. Of course, the above is only one specific embodiment of the present invention, but the present invention is not limited thereto. The specific number of warp threads in the upper warp system 61, the middle warp system 62, and the lower warp system 63 can be adjusted according to the specific width requirements of the zipper tape 1. Specific Implementation Example 2

[0073] Please see Figures 1 to 6 As shown, the present invention discloses a manufacturing process for a zipper tape 1, the manufacturing process comprising the following steps:

[0074] According to the production process diagram, such as Figure 6 The diagram shown is a schematic of a production process of the zipper tape 1 of the present invention. On a weaving machine, the first weft system 71 and the upper warp system 61 are interwoven to form the upper tape 11. When the first weft system 71 moves to the last warp 641 of the upper warp system 61, the first weft system 71 is simultaneously interwoven with the edge warp 641 of the middle warp system 62, thereby connecting the upper tape 11 and the middle tape 12. In specific implementation of the present invention, it is only necessary to interweave the first weft system 71 with the edge warp 641 of the middle warp system 62, without interweaving with the other warp 641 of the middle warp system 62.

[0075] After interlacing the edges of the first parallel system 71 and the middle meridian system 62, the second parallel system 72 and the middle meridian system 62 are interlaced to form the middle zone 12;

[0076] After the middle layer 12 is woven, the second weft system 72 is interwoven with the lower warp system 63 to form the lower layer 13, that is, the middle warp system 62 and the lower warp system 63 are interwoven together with the second weft system 72. Alternatively, when the second weft system 72 moves to the last warp 641 of the middle warp system 62, the second weft system 72 is simultaneously interwoven with the edge warp 641 of the lower warp system 63, thereby connecting the middle layer 12 and the lower layer 13. Then, the third weft system 73 is interwoven with the lower warp system 63 to form the lower layer 13. In specific implementation of the present invention, it is only necessary to interweave the second weft system 72 with the edge warp 641 of the lower warp system 63, without interweaving with the other warp 641 of the lower warp system 63.

[0077] By adopting the manufacturing process described above in this invention, the upper layer 11, the middle layer 12, and the lower layer 13 can be reliably connected together, ensuring that the entire zipper tape 1 has strong tensile strength, thus making it suitable for various different usage environments and better meeting customer needs. Specific Implementation Example 3

[0079] Please see Figures 1 to 9 As shown, this invention discloses a zipper product, including a bag-like container and an expansion zipper 100. The expansion zipper 100 is disposed on the bag-like container, allowing the container to be expanded in size as needed during use to better meet usage requirements. The bag-like container may include handbags, backpacks, suitcases, etc. The specific structure of the expansion zipper 100 and the technical effects it achieves are completely identical to those in Specific Embodiment 1, which will not be repeated here.

[0080] Please refer to the following carefully. Figures 7-9 As shown, the following is a detailed description of the technical solution of the present invention, taking the application of the expansion zipper 100 to a handbag 200 as an example:

[0081] The side of each pair of zipper tapes 1 of the expansion zipper 100 away from the chain teeth 2 is sewn together with the fabric 201 on both sides of the opening of the handbag 200 through the second seam 8, thereby realizing the installation of the expansion zipper 100 onto the handbag 200.

[0082] When the handbag 200 is in use and contains few items, the zipper strap 1 of the expansion zipper 100 can be kept in an unexpanded state. Even if the upper strap 11, middle strap 12, and lower strap 13 of the zipper strap 1 are stacked together to form an "N"-shaped structure, the entire handbag 200 will have a trapezoidal shape, giving it a compact and delicate visual effect. Figure 7 As shown.

[0083] When the handbag 200 contains a lot of items, the zipper strap 1 of the expansion zipper 100 can be unfolded. Even if the upper strap 11, middle strap 12, and lower strap 13 of the zipper strap 1 are stretched and unfolded into a straight line, the entire handbag 200 will have a rectangular shape, giving it a more upright visual effect. Figure 9 As shown. Additionally, by expanding the capacity of the handbag 200 using the zippered strap 1, the carrying capacity can be appropriately increased.

[0084] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An expandable zipper, comprising a pair of zipper tapes, a pair of chain teeth mounted between the two zipper tapes, and a zipper pull for separating or closing the pair of chain teeth; characterized in that: At least one of the zipper tapes includes an upper tape, a middle tape, and a lower tape arranged sequentially from top to bottom; One end of the middle layer belt is flush with and connected to one end of the upper layer belt, and the other end of the upper layer belt extends beyond the other end of the middle layer belt to form a first connecting portion for connecting the chain teeth or the fabric; one end of the lower layer belt is flush with and connected to the other end of the middle layer belt, and the other end of the lower layer belt extends beyond one end of the middle layer belt to form a second connecting portion for connecting the fabric or the chain teeth; the zipper tape can be stretched under external force to make the upper layer belt, middle layer belt and lower layer belt in a straight state.

2. The expandable zipper as described in claim 1, characterized in that: Each pair of zipper tapes includes an upper tape, a middle tape, and a lower tape arranged sequentially from top to bottom.

3. The expandable zipper as described in claim 1, characterized in that: The chain teeth are sewn to the edge of the first connecting part by a first stitch, and the second connecting part is used to connect the fabric.

4. The expandable zipper as described in claim 3, characterized in that: The dimension of the first connecting part along the width direction of the zipper tape is greater than the dimension of the chain teeth along the width direction of the zipper tape; the dimension of the second connecting part along the width direction of the zipper tape is 5% to 40% of the dimension of the middle layer tape along the width direction of the zipper tape.

5. A capacity-expanding zipper as described in any one of claims 1-4, characterized in that: The zipper tape is formed by interlacing multiple warp and weft systems to create partially overlapping and connected upper, middle, and lower tapes.

6. The expandable zipper as described in claim 5, characterized in that: The zipper tape is formed by three layers of warp and two layers of weft interlacing to form an upper, middle and lower tape that are partially overlapping and connected. The three-layer meridian system includes the upper meridian system, the middle meridian system, and the lower meridian system; the two parallel systems include the first parallel system and the second parallel system. The upper meridian system interweaves with the first parallel system to form the upper zone, the middle meridian system interweaves with the second parallel system to form the middle zone, and the second parallel system interweaves downwards from the edge of the middle meridian system with the lower meridian system to form the lower zone; the edge of the upper meridian system and the edge of the middle meridian system are connected by interweaving through the first parallel system.

7. The expandable zipper as described in claim 5, characterized in that: The zipper tape is formed by three layers of warp and three layers of weft interlacing to form an upper, middle and lower tape that partially overlap and are connected. The three-layer meridian system includes the upper meridian system, the middle meridian system, and the lower meridian system; the three-layer parallel system includes the first parallel system, the second parallel system, and the third parallel system. The upper meridian system interweaves with the first parallel system to form the upper zone; the middle meridian system interweaves with the second parallel system to form the middle zone; and the lower meridian system interweaves with the third parallel system to form the lower zone. The edge of the upper meridian system is connected to the edge of one side of the middle meridian system through the first parallel system, and the edge of the other side of the middle meridian system is connected to the edge of the lower meridian system through the second parallel system.

8. A capacity-expanding zipper as described in claim 6 or 7, characterized in that: The upper, middle, and lower layers all employ a plain weave structure.

9. A manufacturing process for the expandable zipper according to claim 8, characterized in that: The manufacturing process of the zipper tape includes the following steps: According to the production process diagram, the first weft system and the upper warp system are interwoven together on the ribbon weaving machine to form the upper ribbon; when the first weft system moves to the last warp of the upper warp system, the first weft system is simultaneously interwoven with the edge warp of the middle warp system. After interlacing the edges of the first parallel system with the middle meridian system, the second parallel system with the middle meridian system is interlaced to form the middle zone; After the middle layer is woven, the second weft system is interwoven with the lower warp system to form the lower layer. Alternatively, when the second parallel system moves to the last meridian of the middle meridian system, it interweaves with the meridians at the edge of the lower meridian system, and then the third parallel system interweaves with the lower meridian system to form the lower zone.

10. A zipper product, characterized in that: Includes bags and containers and the expansion zipper as described in any one of claims 1-8, wherein the expansion zipper is disposed on the bags and containers.

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