Hidden slide fastener assembly

Abstract

The present disclosure relates to a concealed slide fastener assembly comprising a slide fastener, a first sewn material, and a second sewn material. The slide fastener comprises first and second fastener elements and first and second fastener element supports. The first and second fastener elements are provided on the first and second fastener element supports, respectively. An end of the second sewn material is bent at least twice in the same clockwise direction. The second last bend forms a first bend portion having a multi-layered structure in the second sewn material. A second bend portion of the second sewn material is formed by the one last bend in the multi-layered structure formed by the second last bend. The second fastener element support is at least partially sewn to the inside of the second bend portion of the second sewn material. The first fastener element support is sewn to the first sewn material. The first bend portion of the second sewn material is configured to abut against the first sewn material to allow the first fastener element to join with the second fastener element. The entire slide fastener is configured to be concealed from the outside by the first sewn material and the second sewn material.

Description

Technical Field

[0001] The present invention relates to the field of slide fasteners, and more specifically to a concealed slide fastener assembly.

Background Art

[0002] A concealed slide fastener is a type of coil fastener. In the basic structure of a coil fastener, a fastener element is sewn to a fastener tape. When the coil fastener is attached to the back side, the fastener element is located inside (the inside of the object to be sewn), so that only the tape can be seen. The coil fastener attached to the back side is also called the initial concealed slide fastener. Recently, the demand for the concealed type has increased, and the currently defined concealed slide fastener has emerged. In a concealed slide fastener, the fastener tape is curved and the curved surfaces are brought into contact with each other so that the fastener element cannot be seen from the outside, thereby realizing a good concealment effect. Therefore, concealed slide fasteners are widely used in the clothing field, especially for women's formal dresses and various sofas and seat covers.

[0003] Patent Document 1 discloses a concealed slide fastener for an automobile seat. An automobile seat needs to use a slide fastener during installation, and the seat cover has high requirements for the concealment effect of the slide fastener. However, the tension in the width direction of the slide fastener is large, and the tape of a normal concealed slide fastener is likely to be separated. Therefore, a hard film is added inside the tape to improve the hardness of the tape so that the bent portions can properly contact each other. However, when a hard film is provided inside the tape, the process and cost increase. Also, when sewing the fastener element, the needle must penetrate the hard film, so the strength requirement for the needle also increases, otherwise there is a risk of needle breakage.

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] Specification of Chinese Patent No. 102481040 [Summary of the Invention] [Problems to be Solved by the Invention]

[0005] An object of the present disclosure is to provide a concealed slide fastener assembly capable of eliminating at least one drawback in the prior art. [Means for Solving the Problems]

[0006] To achieve the above object, the present disclosure provides a concealed slide fastener assembly, the concealed slide fastener assembly comprising a slide fastener, a first sewing material, and a second sewing material, the slide fastener comprising a first fastener element and a second fastener element, and a first fastener element support and a second fastener element support, the first fastener element and the second fastener element being respectively provided on the first fastener element support and the second fastener element support, characterized in that an end portion of the second sewing material is bent at least twice in the same clockwise direction, wherein a first bent portion having a multilayer structure in the second sewing material is formed by the second last bending, and by performing a last bending on the multilayer structure formed by the second last bending, a second bent portion of the second sewing material is formed, the second fastener element support is at least partially sewn inside the second bent portion of the second sewing material, the first fastener element support is sewn on the first sewing material, the first bent portion of the second sewing material abuts against the first sewing material so that the first fastener element can be joined to the second fastener element, and the entire slide fastener is configured to be shielded from the outside by the first sewing material and the second sewing material.

[0007] By bending the end of the second sewing material at least twice in the same clockwise direction, a large elastic bending rate can be obtained in the end region of the second sewing material without increasing the cost excessively. As a result, the first bent portion of the second sewing material can properly contact the first sewing material and is less likely to deform, thereby substantially preventing the formation of a gap on the contact surface between the first bent portion of the second sewing material and the first sewing material. In addition, the fastener element support provided on the second bent portion of the second sewing material is also less likely to deform, thereby realizing a good hiding effect. By bending only the second sewing material itself, an improvement in the elastic bending rate is realized without introducing other rigid members. Therefore, when sewing the fastener element together with the fastener element support to the second sewing material according to the present disclosure, the sewing process becomes simpler, and there is no risk of needle breakage.

[0008] In some embodiments, in the non-bent state, the bending elastic modulus of the first sewing material may be greater than the bending elastic modulus of the second sewing material. Thereby, the bending elastic modulus of the first sewing material in the non-bent state can cooperate with the elastic bending rate at the end of the second sewing material after the end is bent. Further, here, no other rigid members are introduced either. When sewing the fastener element together with the fastener element support to the first sewing material according to the present disclosure, the sewing process becomes simpler, and there is no risk of needle breakage.

[0009] In some embodiments, the bending elastic modulus of the first sewing material may be 1.5 times or more of the bending elastic modulus of the second sewing material. The bending elastic modulus of the first sewing material may preferably be 2 times the bending elastic modulus of the second sewing material, particularly preferably 2.5 times, and most optimally 3 times.

[0010] In some embodiments, the first sewing material is bent substantially in an L shape to form a first bent portion of the first sewing material, and the first bent portion of the second sewing material and the first bent portion of the first sewing material can abut against each other at corresponding bending locations. By bending the first sewing material substantially in an L shape, an improvement in the bending modulus of elasticity can be similarly achieved at the first bent portion of the first sewing material, thereby further improving the hiding effect of the hidden slide fastener.

[0011] In some embodiments, the joint surface between the first fastener element and the second fastener element may be flush with the abutting surface between the first bent portion of the first sewing material and the first bent portion of the second sewing material. Thereby, when joining the two fastener elements, the first fastener element and the second fastener element can be joined together more simply and intuitively.

[0012] In some embodiments, the joint surface between the first fastener element and the second fastener element and the abutting surface between the first bent portion of the first sewing material and the first bent portion of the second sewing material may be offset from each other. Thereby, the joint surface between the first fastener element and the second fastener element, i.e., the center line of the hidden slide fastener, is either directly covered by the first sewing material or directly covered by the second sewing material, and thus a good hiding effect can be obtained.

[0013] In some embodiments, the thickness of the first sewing material may be greater than the thickness of the second sewing material.

[0014] In some embodiments, the first sewing material may have a composite structure, the composite structure includes at least a surface structure and a base structure, and the bending modulus of elasticity of the composite structure formed jointly by the surface structure or the base structure or both the surface structure and the base structure is greater than that of the second sewing material. By providing the composite structure, a more flexible material selection can be realized, and various functions can be realized using various materials. For example, the base structure of the composite structure can assume functions related to the bending modulus of elasticity, and the surface structure can assume functions related to appearance.

[0015] In some embodiments, the first sewing material may have a bending modulus of elasticity in the contact zone that contacts at least the first fastener element support greater than that of the second sewing material. Preferably, the first sewing material may have a bending modulus greater than that of the second sewing material only in the contact zone that contacts the first fastener element support. Thereby, since the contact zone can be reinforced pinpoint, the cost can be appropriately controlled.

[0016] In some embodiments, the first sewing material has a small elastic bending modulus in the zone that does not contact the first fastener element support. Thereby, the first sewing material can be bent more easily and appropriately also in other regions where the fastener element support is not provided. For example, when it is necessary to attach the first sewing material onto another article, a good attachment effect can be achieved and wrinkles are less likely to occur during bending.

[0017] In some embodiments, the second bent portion of the second sewing material may be substantially configured in an L shape or a U shape.

Brief Description of the Drawings

[0018] Next, with reference to schematic drawings, the present disclosure will be further described by way of exemplary embodiments.

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Figure 10A

Figure 10B

DETAILED DESCRIPTION OF THE INVENTION

[0019] Next, the hidden slide fastener assembly based on the present disclosure will be described in detail with reference to FIGS. 1 to 7. In this specification, the opening and closing direction of the slide fastener in the plane where the slide fastener body is located is referred to as the vertical direction, and the direction orthogonal to the vertical direction in the plane where the slide fastener body is located is referred to as the horizontal direction.

[0020] FIG. 1 shows a schematic diagram of a first embodiment of the hidden slide fastener assembly based on the present disclosure. FIG. 2 is a schematic diagram of the detailed structure of the hidden slide fastener assembly of FIG. 1.

[0021] As shown in FIGS. 1 and 2, in the first embodiment, the hidden slide fastener assembly includes a slide fastener, a first sewing material 1, and a second sewing material 2. The slide fastener includes a first fastener element 14 and a second fastener element 24, and a first fastener element support 13 and a second fastener element support 23. The slide fastener may be configured as a coil fastener (also referred to as a coil zipper). The first fastener element 14 and the second fastener element 24 may be respectively provided on the first fastener element support 13 and the second fastener element support 23 (for example, by sewing). The first fastener element support 13 and the second fastener element support 23 may be, for example, fastener tapes. The end of the second sewing material 2 is bent counterclockwise twice. Here, by the first bending, a first bent portion 21 having a two-layer structure in the second sewing material 2 is formed, and by performing the second bending with respect to the two-layer structure formed by the first bending, a second bent portion 22 of the second sewing material 2 is formed. As clearly shown in FIG. 2, the first bent portion 21 of the second sewing material 2 is formed by a bending of approximately 180°, and the second bent portion 22 of the second sewing material 2 is substantially U-shaped. It is understood that the end of the second sewing material 2 may also be bent clockwise according to actual needs.

[0022] In some embodiments, the end of the second sewing material 2 may be bent more than twice, for example, bent three times or more. Thereby, by bending more than twice, better bend resistance of the end can be obtained, and thus a good hiding effect is realized. When the end of the second sewing material 2 is bent counterclockwise twice, in this specification, the second last bending is referred to as the first bending, and the last bending is referred to as the second bending. When the end of the second sewing material 2 is bent three times, a first bent portion 21 having a four-layer structure is formed in the second sewing material 2, but in this specification, the second last bending is referred to as the second bending, and the last bending is referred to as the third bending.

[0023] The second fastener element support 23 may extend substantially across the entire second bent portion 22 in the lateral direction in the first embodiment. In some embodiments, the second fastener element support 23 may also extend in the lateral direction to a part of the second bent portion 22. For example, the second fastener element support 23 may extend across half of the second bent portion 22 in the lateral direction. The second fastener element support 23 is sewn inside the second bent portion 22 of the second sewing material 2.

[0024] The first sewing material 1 is not bent in the first embodiment and is thus substantially flat. When not bent, the flexural modulus of the first sewing material 1 is substantially twice the flexural modulus of the second sewing material 2. In some embodiments, when not bent, the flexural modulus of the first sewing material 1 may also be 2.5 times, 3 times, or more than the flexural modulus of the second sewing material 2.

[0025] Generally, the larger the flexural modulus, the more difficult it is to bend. Within the scope of the present disclosure, the flexural moduli of various members can be determined by a test method similar to the cantilever beam bending test. As shown in FIG. 10A, in order to determine the flexural modulus of a member, it is first necessary to fabricate a test piece 3, which is divided into two parts, one part is a clamping portion 31 and the other part is an angle measurement portion 32. Here, as shown in the schematic test diagram of FIG. 10B, the clamping portion 31 is clamped by a test jig during the test, and the angle measurement portion 32 is suspended outside so as to observe the angle change due to gravity within a predetermined time during the test. In this test method, the length l and width w of the angle measurement portion 32 are determined, and the thickness d and material of the test piece are changed to observe the influence of the thickness and material on the flexural modulus of the test piece. Here, the variable of material refers not only to the composition of the material, but also to the arrangement of the material when, for example, an anisotropic material is used. The length l of the angle measurement portion 32 may be, for example, 200 mm, and its width w may be, for example, 100 mm. When conducting the test, the angle change of the angle measurement portion 32 within a predetermined time, for example, 1 minute, can be observed. As shown in FIG. 10B, if the included angle between the lower side of the angle measurement portion of the first test piece 33 and the end face of the jig is α1, and the included angle between the lower side of the angle measurement portion of the second test piece 34 and the end face of the jig is α2, here, α2 is larger than α1. From the test results, it can be seen that the flexural modulus of the second test piece 34 is larger than that of the first test piece 33.

[0026] The following conclusions can be obtained by the test method based on the present disclosure. When the material remains unchanged, increasing the thickness of the member can improve the flexural modulus of the member. When the thickness remains unchanged, using a material with a higher flexural modulus can improve the flexural modulus of the member. To obtain a higher flexural modulus, a composite material or a composite structure can preferably be used. For example, the first member can be composed of fabric, and the second member can be composed of fabric and leather, where the flexural modulus of leather is greater than that of fabric. Thereby, the second member composed of the composite material including fabric and leather has a greater flexural modulus than the first member composed only of fabric. Further, when an anisotropic material, such as a fiber material, is used for the member, the flexural modulus of the member can also be changed depending on the stacking direction or weaving method of the fiber material, where the weaving method may relate to plain weave, twill weave, satin weave, etc.

[0027] In the present disclosure, the thickness of the first sewing material 1 is greater than the thickness of the second sewing material 2. For example, the thickness of the first sewing material 1 is approximately twice the thickness of the second sewing material 2. In some embodiments, the first sewing material 1 may also use a material that is harder than the second sewing material 2, that is, a material that is difficult to bend. In some embodiments, the first sewing material 1 may also use a composite structure, the composite structure may include a base structure and a surface layer structure, and at least one structure or a combination of two structures in the composite structure can achieve the purpose of improving the flexural modulus. For example, the base structure may have a large thickness and / or be composed of a hard material, and the surface layer structure may be a decorative layer, for example, a decorative layer made of Alcantara material, to further improve the appearance of the second decorative layer. Also for example, the base structure of the first sewing material may be composed of fabric, and the surface layer structure may be composed of leather, while the second sewing material may be composed of only fabric, where the flexural modulus of leather is greater than the flexural modulus of fabric. Thereby, when the thicknesses of the first sewing material and the second sewing material are the same, the flexural modulus of the first sewing material using the composite structure is greater than the flexural modulus of the second sewing material as a whole. In some embodiments, the second sewing material 2 may also have a composite structure.

[0028] The first fastener element support 13 is sewn onto the non-curved end of the first sewing material 1 in the first embodiment. The first bent portion 21 of the second sewing material 2 abuts against the first sewing material 1 so that the first fastener element 14 can be joined to the second fastener element 24. As shown in FIG. 1, in the state where each fastener element of the hidden slide fastener assembly is joined, the entire slide fastener is shielded from the outside by the first sewing material 1 and the second sewing material 2, so that the internal fastener elements cannot be visually recognized from the outside, thereby achieving a good hiding effect.

[0029] FIG. 3 is a schematic diagram of a second embodiment of a hidden slide fastener assembly according to the present disclosure. FIG. 4 is a detailed structural schematic diagram of the hidden slide fastener assembly of FIG. 3.

[0030] As shown in FIGS. 3 and 4, the difference between the first embodiment and the second embodiment is that in the second embodiment, the second bent portion 22 of the second sewing material 2 is substantially L-shaped, and the first sewing material 1 is bent substantially into an L-shape, thus forming the first bent portion 11 of the first sewing material 1. The first bent portion 11 of the first sewing material 1 is generated by being bent approximately 90°. In other respects, the first embodiment and the second embodiment are substantially the same. The first sewing material 1 is curved into an L-shape at the end. In some embodiments, the first sewing material 1 may also be curved into an L-shape in a region that is not the end.

[0031] In the second embodiment, the joint surface between the first fastener element 14 and the second fastener element 24 and the contact surface between the first bent portion 11 of the first sewing material 1 and the first bent portion 21 of the second sewing material 2 are flush, as schematically shown in FIG. 3. "Flush" means that the straight line that is parallel to the contact surface and passes through the contact surface extends substantially and penetrates the joint surface between the first fastener element 14 and the second fastener element 24. In FIG. 4, the "flush" state is shown by a dashed line. When arranged flush, the first fastener element support 13 extends on the first bent portion 11 of the first sewing material 1 up to the bending location. Thereby, the first fastener element 14 on the first fastener element support 13 and the second fastener element 24 on the second fastener element support 23 are joined substantially beside the contact surface between the first bent portion 11 of the first sewing material 1 and the first bent portion 21 of the second sewing material 2.

[0032] FIG. 5 is a schematic view of a third embodiment of the hidden slide fastener assembly according to the present disclosure.

[0033] As can be clearly seen by combining FIGS. 3 and 5, the structures of the third embodiment and the second embodiment are substantially the same. The difference between these two embodiments is that, in the third embodiment, the joint surface between the first fastener element 14 and the second fastener element 24 and the contact surface between the first bent portion 11 of the first sewing material 1 and the first bent portion 21 of the second sewing material 2 are offset from each other. The joint surface between the first fastener element 14 and the second fastener element 24 is displaced onto the first bent portion 11 of the first sewing material 1. For this reason, the first fastener element support 13 does not extend to the bent portion on the first bent portion 11 of the first sewing material 1, but the second fastener element support 23 extends from the second bent portion 22 of the second sewing material 2, and thus the first fastener element 14 on the first fastener element support 13 and the second fastener element 24 on the second fastener element support 23 can be joined in the region at the first bent portion 11 of the first sewing material 1. In some embodiments, the joint surface between the first fastener element 14 and the second fastener element 24 may also be displaced onto the second bent portion 22 of the second sewing material 2. For this reason, the first fastener element support 13 extends from the first bent portion 11 of the first sewing material 1, but the second fastener element support 23 does not extend to the location of the first bent portion 21 of the second sewing material 2, and thus the first fastener element 14 on the first fastener element support 13 and the second fastener element 24 on the second fastener element support 23 can be joined in the region at the second bent portion 22 of the second sewing material 2.

[0034] FIG. 6 is a schematic view of a fourth embodiment of a hidden slide fastener assembly according to the present disclosure.

[0035] The structures of the fourth embodiment and the second embodiment are substantially the same. The difference between these two embodiments is that, in the fourth embodiment, the second bent portion 22 of the second sewing material 2 is substantially U-shaped.

[0036] FIG. 7 is a schematic view of a fifth embodiment of a hidden slide fastener assembly according to the present disclosure.

[0037] In the fifth embodiment, the first sewing material 1 uses a harder, i.e., less bendable material in the contact zone 15 that contacts the first fastener element support 13. Thus, in the contact zone 15, the first sewing material 1 has a large flexural modulus. In some embodiments, the first sewing material 1 may have a greater thickness in the contact zone that contacts the first fastener element support 13, and the thickness may be partially increased by laminating them with each other using a multi-layer structure. In some embodiments, the first sewing material 1 may also use the composite structure described above in the contact zone that contacts the first fastener element support 13. By providing at least one structure in the composite structure with a large flexural modulus, an improvement in the flexural modulus of the partial region is achieved. In some embodiments, the first sewing material 1 has a small flexural modulus in the remaining region that does not contact the first fastener element support 13. For example, by using a soft material and / or having a small thickness, the first sewing material 1 can be easily bent in the remaining region and thereby have good adhesiveness, and at the same time, wrinkles are less likely to occur during bending.

[0038] FIG. 8 is a rear view of a seat cover using a hidden slide fastener assembly according to the present disclosure. FIG. 9 is a rear perspective view of a seat cover using a hidden slide fastener assembly according to the present disclosure. In the present disclosure, the first sewing material 1 and the second sewing material 2 can each be configured as a seat cover for a seat or an intermediate adapter (not shown) to be sewn to the seat cover and installed between the seat cover and the fastener element, and the intermediate adapter is usually disposed inside the corresponding seat cover. FIGS. 8 and 9 show the case where the first sewing material 1 and the second sewing material 2 are each configured as a seat cover. The first sewing material 1 may be configured as a side seat cover, and the second sewing material 2 may be configured as a rear seat cover. The correspondence between the first sewing material 1 and the second sewing material 2 and the seat cover in the figures is only schematic, and the first sewing material 1 and the second sewing material 2 may be configured as seat covers for other parts. In the embodiments shown in FIGS. 8 and 9, the extending direction of the first sewing material 1 and the extending direction of the second sewing material 2 are substantially perpendicular to each other. The hidden slide fastener assembly of the fourth embodiment shown in FIG. 6 may be used. The first fastener element 14 and the second fastener element 24 are shown as square dots in FIGS. 8 and 9 to schematically indicate their installation positions, but actually these hidden slide fastener elements are not visible. The seat may be a seat of a transportation means or an interior chair. The transportation means may be a land transportation means, such as a sedan, a truck, a bus, or a forklift. The transportation means may also be a water transportation means, such as a ship. Further, the transportation means may also be an air transportation means, such as an airplane. The hidden slide fastener assembly of the present disclosure can also be used in the field of clothing.

[0039] It should be noted that the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the invention. The singular forms "a" and "the" as used herein should include the plural forms unless otherwise specified in the context. The terms "comprising", "including" and other similar terms, when used in the application documents, are intended to specifically describe the presence of the recited operations, elements and / or components and do not exclude the presence or addition of one or more other operations, elements, components and / or combinations thereof. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. In the description of the figures, like reference numerals always represent like elements.

[0040] The thickness of the elements in the figures may be exaggerated for clarity. Further, when an element is referred to as being "on", "coupled to", or "connected to" another element, it can be directly formed on, coupled to, or connected to the other element, or can have one or more intervening elements therebetween. Conversely, when the expressions "directly on", "directly coupled to", and "directly connected to" are used herein, it means that there are no intervening elements. Other terms used to describe the relationship between elements, such as "between" and "directly between", "attached" and "directly attached", "adjacent" and "directly adjacent", etc., should be interpreted in the same way.

[0041] Here, for example, terms such as "top", "bottom", "above", "below", "upper surface", "lower surface", etc. are used to describe the relationship of one element, layer or region to another element, layer or region as shown in the figures. In addition to the orientation shown in the figures, these terms should be understood to include other orientations of the device.

[0042] The terms "first", "second", etc. can be used here to describe different elements, but it should be understood that these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Therefore, the first element may also be referred to as the second element, without departing from the teachings of the idea of the present disclosure.

[0043] It may also be considered that any of the exemplary embodiments disclosed herein can be freely combined with each other. Furthermore, any of the individual technical features in this application can be freely combined with each other, as long as the combined technical features do not conflict with each other. Any combination of technically feasible features is the technical content described in this application.

[0044] Finally, it should be pointed out that the above embodiments are only for understanding the present disclosure and do not constitute a limitation on the protection scope of the present disclosure. Those skilled in the art can make modifications based on the above embodiments, but these modifications do not fall outside the protection scope of the present disclosure.

[0045] This application is based on Chinese Patent Application No. 202210973794.4 filed on August 15, 2022, the content of which is incorporated herein by reference.

Claims

1. A hidden slide fastener assembly comprising a slide fastener, a first sewing material, and a second sewing material, wherein the slide fastener comprises a first fastener element and a second fastener element, and a first fastener element support and a second fastener element support, and the first fastener element and the second fastener element are respectively provided on the first fastener element support and the second fastener element support. The end of the second sewing material is bent at least twice in one of the clockwise and counterclockwise directions. Here, a first bent portion having a multi-layer structure in the second sewing material is formed by the second-to-last bend in one of the directions, and by performing the last bend in one of the directions with respect to the multi-layer structure formed by the second-to-last bend, a second bent portion of the second sewing material is formed. The second fastener element support is at least partially sewn inside the second bent portion of the second sewing material, the first fastener element support is sewn on the first sewing material, and the first bent portion of the second sewing material abuts against the first sewing material so that the first fastener element can be joined to the second fastener element, and the entire slide fastener is configured to be shielded from the outside by the first sewing material and the second sewing material. A hidden slide fastener assembly characterized by the above.

2. The hidden slide fastener assembly according to claim 1, wherein the flexural modulus of the first sewing material is greater than the flexural modulus of the second sewing material in a non-bent state.

3. The hidden slide fastener assembly according to claim 2, wherein the flexural modulus of the first sewing material is 1.5 times or more the flexural modulus of the second sewing material.

4. The first sewing material is bent substantially in an L shape to form a first bent portion of the first sewing material, and the first bent portion of the second sewing material and the first bent portion of the first sewing material abut against each other at corresponding bent portions. The hidden slide fastener assembly according to claim 2 or 3, characterized by the above.

5. The hidden slide fastener assembly according to claim 4, wherein the joint surface between the first fastener element and the second fastener element and the contact surface between the first bent portion of the first sewing material and the first bent portion of the second sewing material are flush.

6. The joint surface between the first fastener element and the second fastener element, and the contact surface between the first bent portion of the first sewing material and the first bent portion of the second sewing material are offset from each other. The hidden slide fastener assembly according to claim 4, characterized in that.

7. The hidden slide fastener assembly according to claim 2, characterized in that the thickness of the first sewing material is greater than the thickness of the second sewing material.

8. The first sewing material has a composite structure, the composite structure includes at least a surface layer structure and a base structure, and the bending elastic modulus of the composite structure formed jointly by the surface layer structure or the base structure or the surface layer structure and the base structure is greater than the bending elastic modulus of the second sewing material. The hidden slide fastener assembly according to claim 2, characterized in that.

9. The hidden slide fastener assembly according to claim 2, characterized in that the first sewing material has a bending elastic modulus in at least the contact zone in contact with the first fastener element support that is greater than the bending elastic modulus of the second sewing material.

10. The hidden slide fastener assembly according to claim 9, characterized in that the first sewing material has a small elastic bending rate in a zone that does not contact the first fastener element support.

11. The hidden slide fastener assembly according to any one of claims 1 to 3, characterized in that the second bent portion of the second sewing material is substantially configured in an L shape or a U shape.

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