Manufacturing method for slide fasteners

Abstract

This invention provides a manufacturing method that enables the stable production of slide fasteners with excellent concealment of element rows, and consequently, superior appearance. [Solution] The method for manufacturing the slide fastener (1) comprises: a sewing process (S1) performed with the first and second element rows (50, 60) separated from each other; a dyeing process (S3) performed with the first and second element rows (50, 60) interlocked and the first fastener tape (10) and the second fastener tape (20) overlapped; and a folding process (S4) in which the first fastener tape (10) and the second fastener tape (20) are folded when the first and second element rows (50, 60) interlock.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a slide fastener.

Background Art

[0002] As types of slide fasteners, generally, there are a normal type of slide fastener in which an element row is attached so as to be visible on the outer side (front side) of a product, a reverse-use type of slide fastener (so-called reverse-use slide fastener) in which an element row is attached to the inner side (back side) of a product and is difficult to see, and a hidden type of slide fastener (so-called hidden slide fastener) in which side edges of left and right fastener tapes are folded back in a U shape in the width direction and an element row is attached to the folded-back tape portion, etc.

[0003] The reverse-use slide fastener takes advantage of the fact that its concealment does not interfere with the design of a product, and is suitably used for products such as various clothing, shoes, bags, furniture, etc. In recent years, it is also used for seat covers for various seats such as automobiles, trains, airplanes, etc. An example of such a reverse-use slide fastener is disclosed in Japanese Patent Application Laid-Open No. 2009-56076 (Patent Document 1).

[0004] FIG. 10 is a flowchart showing a method for manufacturing a normal reverse-use slide fastener. FIG. 11(a) is a diagram schematically showing cross-sections of a fastener tape and an element row in the sewing step, setting step, and dyeing step of FIG. 10. FIG. 11(b) is a diagram schematically showing cross-sections of a fastener tape, an element row, and a water-stopping film in the water-stopping film adhesion step of FIG. 10. FIG. 11(c) is a diagram schematically showing cross-sections of a fastener tape, an element row, and a water-stopping film in the cutting step of FIG. 10.

[0005] A method for manufacturing a normal reverse-use slide fastener includes a sewing step S11, a setting step S12, a dyeing step S13, a water-stopping film adhesion step S14, a cutting step S15, and a water-repellent treatment step S16, as shown by an example in FIG. 10.

[0006] As shown in Figure 11(a), in sewing process S11, the first element row 250 is sewn to the first fastener tape 210, and the second element row 260 is sewn to the second fastener tape 220 to form fastener stringers 203 and 205. Next, in setting process S12, the fastener stringers 203 and 205 are heated to stabilize their shape, and then in dyeing process S13, the fastener stringers 203 and 205 are dyed.

[0007] Next, as shown in Figure 11(b), in the waterproofing film bonding step S14, a single waterproofing film 290 is bonded to the first and second fastener tapes 210 and 220 using the upper and lower pressure rolls 800 and 850. At this time, the first and second element rows 250 and 260 are guided by the guide grooves 810 provided on the upper pressure roll 800, while the fastener stringers 203 and 205 are pressed together with the single waterproofing film 290. Then, as shown in Figure 11(c), in the cutting step S15, the single waterproofing film 290 is cut along the boundary between the first and second fastener tapes 210 and 220 using a cutting tool 450 consisting of a rotating blade or the like. This forms a pair of left and right first and second waterproofing films 270 and 280. Finally, in the water-repellent treatment step S16, a water-repellent agent is applied to the fastener stringers 203 and 205.

[0008] In the above-described method for manufacturing a standard reverse-use slide fastener, as shown in Figures 10 and 11(a) to 11(c), the first and second element rows 250 and 260 are interlocked in all steps, and the slide fastener is manufactured with one end 210a in the width direction of the first fastener tape 210 and one end 220a in the width direction of the second fastener tape 220 positioned adjacent to each other on the left and right.

[0009] In a typical reverse-use slide fastener, a gap (a so-called partition) is formed between the left and right pair of fastener tapes. Therefore, when an external force (a so-called lateral pull) is applied to the left and right pair of fastener tapes in a direction that separates them, the row of elements may be visible through the gap when the user views the reverse-use slide fastener from the front side. This reduction in the concealment of the row of elements is undesirable because it degrades the design of items in which reverse-use slide fasteners are used, especially items where aesthetics are important, such as car seats, bags, and furniture.

[0010] Therefore, in the slide fastener described in Patent Document 2 (hereinafter referred to as the slide fastener with improved concealment), the pair of left and right fastener tapes are formed to be longer in the direction toward each other compared to the slide fastener described in Patent Document 1. As a result, when the pair of left and right element rows are interlocked and the slide fastener is closed, the pair of left and right fastener tapes buckle into a mountain shape and adhere closely to each other, thereby improving the concealment of the element rows. [Prior art documents] [Patent Documents]

[0011] [Patent Document 1] Japanese Patent Publication No. 2009-56076 [Patent Document 2] International Publication No. 2023 / 243081 [Overview of the project] [Problems that the invention aims to solve]

[0012] In a standard reverse-use slide fastener, even when the first and second element rows 250 and 260 are engaged, the widthwise end 210a of the first fastener tape 210 and the widthwise end 220a of the second fastener tape 220 do not interfere with each other, making it possible to manufacture the fastener with the first and second element rows 250 and 260 consistently engaged.

[0013] However, when manufacturing the concealment-enhancing slide fastener described in Patent Document 2, if the left and right pairs of element rows are interlocked during manufacturing, the left and right pairs of fastener tapes may interfere with each other. For example, during the sewing process, when sewing one side of the fastener tape to the element row, the fastener tape on the other side may also be sewn in. For this reason, there was a problem in that the conventional method for manufacturing reverse-use slide fasteners could not reliably produce concealment-enhancing slide fasteners.

[0014] This invention has been made in view of the above-mentioned problems, and its purpose is to provide a manufacturing method that can stably produce slide fasteners with excellent concealment of element rows and, consequently, excellent appearance. [Means for solving the problem]

[0015] The above objective of the present invention is achieved by the following configuration. (1) A pair of first and second fastener tapes (10, 20) A first element row (50) is provided at one end (10a) in the width direction of the first fastener tape (10), A second row of elements (60) is provided at one end (20a) in the width direction of the second fastener tape (20), Equipped with, The first and second element rows (50, 60) are interlocking and separable from one another. When the first and second element rows (50, 60) interlock with each other, one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) buckle in a curved shape and come into close contact with each other. A method for manufacturing a slide fastener (1), In a state where the first and second element rows (50, 60) are separated from each other, sew the first element row (50) to the first fastener tape (10), and sew the second element row (60) to the second fastener tape (20), a sewing step (S1); Engage the first and second element rows (50, 60) with each other, and in a state where one end portion (10a) in the width direction of the first fastener tape (10) and one end portion (20a) in the width direction of the second fastener tape (20) are overlapped in the front and back directions, dye the first and second fastener tapes (10, 20) and the first and second element rows (50, 60), a dyeing step (S3); When engaging the first and second element rows (50, 60) with each other, bend the first fastener tape (10) and the second fastener tape (20) so that one end portion (10a) in the width direction of the first fastener tape (10) and one end portion (20a) in the width direction of the second fastener tape (20) are respectively buckled in a mountain shape and adhere to each other, a bending step (S4); comprising A method for manufacturing a slide fastener (1), characterized by the above.

Effect of the Invention

[0016] According to the present invention, it is possible to provide a manufacturing method capable of stably manufacturing a slide fastener excellent in the concealability of element rows and thus excellent in appearance.

Brief Description of the Drawings

[0017] [Figure 1] FIG. 1 is a front view of a first embodiment of a slide fastener according to the present invention. [Figure 2] FIG. 2 is a cross-sectional view of a main part of the slide fastener shown in FIG. 1, showing a state where the first and second element rows are engaged. [Figure 3] FIG. 3 is a cross-sectional view of a main part of the slide fastener shown in FIG. 1, showing a state where the first and second element rows are separated. [Figure 4]FIG. 4 is a flowchart showing a method for manufacturing a slide fastener according to the first embodiment. [Figure 5] FIG. 5(a) is a diagram schematically showing a cross-section of a fastener tape and an element row in the sewing process of FIG. 4. FIG. 5(b) is a diagram schematically showing a cross-section of a fastener tape and an element row in the sewing process, the setting process, and the dyeing process of FIG. 4. FIG. 5(c) is a diagram schematically showing a cross-section of a fastener tape and an element row in the bending process of FIG. 4. [Figure 6] FIG. 6 is a cross-sectional view of a main part of a slide fastener according to the second embodiment, showing a state in which the first and second element rows are engaged. [Figure 7] FIG. 7 is a flowchart showing a method for manufacturing a slide fastener according to the second embodiment. [Figure 8] FIG. 8(a) is a diagram schematically showing a cross-section of a fastener tape, an element row, and a water-stop film in the water-stop film adhesion process of FIG. 7. FIG. 8(b) is a diagram schematically showing a cross-section of a fastener tape, an element row, and a water-stop film in the cutting process of FIG. 7. FIG. 8(c) is a view of the water-stop film and the fastener tape as seen from the surface side in the cutting process of FIG. 7. [Figure 9] FIG. 9(a) is a diagram schematically showing a cross-section of a fastener tape, an element row, and a water-stop film in the water-repellent treatment process of FIG. 7. FIG. 9(b) is a diagram schematically showing an apparatus used in the water-repellent treatment process of FIG. 7. FIG. 9(c) is a diagram schematically showing a cross-section of a fastener tape, an element row, and a water-stop film in the bending process and the aging process of FIG. 7. [Figure 10] FIG. 10 is a flowchart showing a method for manufacturing an ordinary inside-out slide fastener. [Figure 11]Figure 11(a) schematically shows the cross-sections of the fastener tape and element row in the sewing process, setting process, and dyeing process of Figure 10. Figure 11(b) schematically shows the cross-sections of the fastener tape, element row, and waterproof film in the waterproof film bonding process of Figure 10. Figure 11(c) schematically shows the cross-sections of the fastener tape, element row, and waterproof film in the cutting process of Figure 10. [Modes for carrying out the invention]

[0018] Hereinafter, each embodiment of the present invention will be described in detail with reference to the drawings. In this specification, "up and down direction" for a slide fastener refers to the sliding direction of the slider, which is the longitudinal direction of the slide fastener. In particular, the direction in which the slider slides so as to interlock the left and right rows of elements is defined as "upward," and the direction in which it slides so as to separate the left and right rows of elements is defined as "downward." Furthermore, in the context of slide fasteners, "left-right direction" refers to the direction in which a pair of element rows are arranged, which is perpendicular to the sliding direction of the slider, and can also be described as the width direction of the slide fastener. Furthermore, regarding slide fasteners and top stops, the "front and back direction" refers to the direction perpendicular to the vertical and horizontal directions, and can also be rephrased as the thickness direction of the fastener tape or the height direction of the element rows.

[0019] (First Embodiment) Figure 1 is a surface view of a first embodiment of the slide fastener according to the present invention. Figure 2 is a cross-sectional view of the main part of the slide fastener shown in Figure 1, showing the state in which the first and second element rows are engaged. Figure 3 is a cross-sectional view of the main part of the slide fastener shown in Figure 1, showing the state in which the first and second element rows are separated.

[0020] As shown in Figures 1 to 3, the slide fastener 1 of this embodiment comprises a pair of left and right fastener stringers 3 and 5, and a slider 40 that can open and close the pair of left and right fastener stringers 3 and 5.

[0021] The left and right pair of fastener stringers 3, 5 are elongated and each has a back surface 11, 21 and a front surface 13, 23 opposite to the back surface 11, 21, respectively. The first fastener tape 10 has a first element row 50 provided on the back surface 11 of one end 10a (right end in Figure 2) in the width direction, and the second fastener tape 20 has a second element row 60 provided on the back surface 21 of one end 20a (left end in Figure 2) in the width direction. Hereafter, in the width direction of the first fastener tape 10 and the second fastener tape 20, the side on which the element row is provided will be defined as the one end in the width direction, and the side on which it is not provided will be defined as the other end in the width direction.

[0022] The first and second fastener tapes 10 and 20 are woven or knitted fabrics made of polyester yarn or the like, and have excellent flexibility. The first and second fastener tapes 10 and 20 may also be nonwoven fabrics.

[0023] The slider 40 engages and disengages a pair of left and right first and second element rows 50, 60. The slider 40 comprises a body 41, a pull tab attachment portion 42 provided on the surface of the body 41, and a pull tab 43 attached to the pull tab attachment portion 42. By moving the slider 40 upward, the pair of left and right first and second element rows 50, 60 engage as shown in Figure 2, and by moving the slider 40 downward, the pair of left and right first and second element rows 50, 60 disengage as shown in Figure 3. The slide fastener 1 may also have an upper stop portion and a lower stop portion (not shown). Alternatively, an opening device having a box bar and a box body may be provided instead of the lower stop portion.

[0024] The first and second element rows 50 and 60 are coil-shaped fastener element rows formed by winding a synthetic resin monofilament in a certain direction, and each row has multiple elements 31. The first and second element rows 50 and 60 are sewn to the back surface 11 of one end 10a in the width direction of the first fastener tape 10 and the back surface 21 of one end 20a in the width direction of the second fastener tape 20 by double-stitched sewing thread 33, through which a core cord 32 is inserted into the interior of the multiple elements 31. Examples of synthetic resin materials for the monofilament include polyester and nylon.

[0025] Element 31 includes an engagement head 31a that engages with and disengages from the mating element 31, a first leg portion 31b that extends from the front end of the engagement head 31a to the other end in the width direction and contacts the first and second fastener tapes 10 and 20, a second leg portion 31c that extends from the back end of the engagement head 31a to the other end in the width direction and does not contact the first and second fastener tapes 10 and 20, and a connecting portion 31d that connects the outer end in the width direction of the first leg portion 31b to the other end in the width direction of the second leg portion 31c of the adjacent element 31. Therefore, the first leg portion 31b and the second leg portion 31c are formed to protrude from and extend parallel to the engagement head 31a.

[0026] Figure 2 shows the meshing centers O of the first and second element rows 50 and 60. These meshing centers O are the center positions when the elements 31, 31 mesh with each other, and coincide with the widthwise center of the slide fastener 1. Figure 3 shows the positions O1 and O2, which become the meshing centers O when the first and second element rows 50 and 60 mesh. Positions O1 and O2 are located on the other end in the widthwise direction of the meshing head 31a of the element 31.

[0027] As shown in Figure 3, when the first and second element rows 50 and 60 are separated, one end 10a in the width direction of the first fastener tape 10 and one end 20a in the width direction of the second fastener tape 20 are spaced apart from each other in the width direction.

[0028] In addition, the upper part of Figure 1 shows the first and second element rows 50 and 60 separated, with one end 10a in the width direction of the first fastener tape 10 and one end 20a in the width direction of the second fastener tape 20 in a buckled, mountain-like shape. This indicates that when the first and second element rows 50 and 60 are separated after a certain period of time has elapsed with them interlocked, the buckling condition remains. After a certain period of time has elapsed with the first and second element rows 50 and 60 separated, the buckling condition is eliminated, and the one end 10a in the width direction of the first fastener tape 10 and one end 20a in the width direction of the second fastener tape 20 may each take on a substantially planar shape as shown in Figure 3.

[0029] As shown in Figure 3, when the first and second element rows 50 and 60 are separated, one end 10a in the width direction of the first fastener tape 10 extends toward the second fastener tape 20 side (one end in the width direction) beyond position O1, which is the interlocking center O of the first and second element rows 50 and 60, and one end 20a in the width direction of the second fastener tape 20 extends toward the first fastener tape 10 side (one end in the width direction) beyond position O2, which is the interlocking center O. That is, as shown in Figure 2, when the first and second element rows 50 and 60 are interlocked, the first and second fastener tapes 10 and 20 are designed to overlap the interlocking center O. By arranging the first and second fastener tapes 10 and 20 and the first and second element rows 50 and 60 in this way, as will be described later, when the first and second element rows 50 and 60 are interlocked, the first and second fastener tapes 10 and 20 can buckle in a curved shape and be brought into close contact with each other.

[0030] More specifically, when the first and second element rows 50 and 60 are separated, one end face 10b in the width direction of the first fastener tape 10 is positioned on the side of the second fastener tape 20 (one end in the width direction) from the position O1 which is the engagement center O, and one end face 20b in the width direction of the second fastener tape 20 is positioned on the side of the first fastener tape 10 (one end in the width direction) from the position O2 which is the engagement center O.

[0031] The widthwise end face 10b of the first fastener tape 10 may be positioned so as to overlap with at least a portion of the interlocking head 31a of the element 31 in the widthwise direction, or it may be positioned on the same plane F1 as the widthwise end face 31e of the interlocking head 31a (i.e., the widthwise end face of the first element row 50) in the widthwise direction, or it may be positioned closer to the second fastener tape 20 than the interlocking head 31a. In the example of Figure 3, the widthwise end face 10b of the first fastener tape 10 is positioned on the same plane F1 as the widthwise end face of the first element row 50 in the widthwise direction.

[0032] The widthwise end face 20b of the second fastener tape 20 may be positioned so as to overlap with at least a portion of the interlocking head 31a of the element 31 in the widthwise direction, or it may be positioned on the same plane F2 as the widthwise end face 31f of the interlocking head 31a (i.e., the widthwise end face of the second element row 60) in the widthwise direction, or it may be positioned closer to the first fastener tape 10 than the interlocking head 31a. In the example of Figure 3, the widthwise end face 20b of the second fastener tape 20 is positioned on the same plane F2 as the widthwise end face of the second element row 60 in the widthwise direction.

[0033] In this way, when the first and second element rows 50 and 60 are separated, by arranging one end face 10b in the width direction of the first fastener tape 10 and one end face in the width direction of the first element row 50 on the same plane F1, and arranging one end face 20b in the width direction of the second fastener tape 20 and one end face in the width direction of the second element row 60 on the same plane F2, when the first and second element rows 50 and 60 are interlocked as described later, the first and second fastener tapes 10 and 20 can more reliably buckle in a parabolic shape and adhere tightly to each other. This is because the end faces 10a and 20a in the width direction of the first and second fastener tapes 10 and 20 do not hinder the interlocking of the first and second element rows 50 and 60, and the arrangement is such that the compression between the first and second fastener tapes 10 and 20 is less likely to fail. Furthermore, "arranged on the same plane" does not necessarily mean that they are arranged exactly on the same plane. It also includes cases where, considering the taper of the meshing head 31a, the widthwise end faces 10b and 20b of the first and second fastener tapes 10 and 20 coincide with the range from the start point to the end point of the taper of the meshing head 31a, and are approximately on the same plane.

[0034] As shown in Figure 3, the first and second element rows 50 and 60 are separated. By moving the slider 40 upward, the first and second element rows 50 and 60 interlock as shown in Figure 2. At this time, one end 10a in the width direction of the first fastener tape 10 extends toward the second fastener tape 20 side (one end in the width direction) beyond the position O1 which is the interlocking center O of the first and second element rows 50 and 60, and one end 20a in the width direction of the second fastener tape 20 extends toward the first fastener tape 10 side (one end in the width direction) beyond the position O2 which is the interlocking center O. As a result, the end 10a and the end 20a in the width direction push against each other in the width direction and deform, buckling into a convex, mountain-like shape on the front side and coming into close contact with each other. In addition, as shown in Figure 2, the sewing thread 33 sewn to the first and second fastener tapes 10 and 20, and the sewing thread 33 on the widthwise end 10a and 20a side of the first and second fastener tapes 10 and 20, may stretch slightly and lift up as the first and second fastener tapes 10 and 20 buckle.

[0035] Furthermore, as shown in Figure 2, when the first and second element rows 50 and 60 are interlocked, the back surfaces 11 and 21 of the widthwise end faces 10b and 20b of the first and second fastener tapes 10 and 20 and the first and second element rows 50 and 60 (elements 31) are spaced apart in the front-to-back direction, and first and second spaces T1 and T2 are defined between them, respectively.

[0036] In this way, when the first and second element rows 50 and 60 are interlocked, the first and second fastener tapes 10 and 20 are in close contact with each other, so that no gap (so-called partition) is formed between the first and second fastener tapes 10 and 20, as is the case with conventional reverse-use slide fasteners. Therefore, when a user looks at the slide fastener 1 from the front, the first and second element rows 50 and 60 are not visible, resulting in a superior appearance. Such a slide fastener 1 is particularly suitable for items where aesthetics are important, such as car seats, bags, and furniture.

[0037] Furthermore, since the first and second fastener tapes 10 and 20 buckle in a parabolic shape and adhere closely to each other, even if a force acting on the first and second fastener tapes 10 and 20 in a direction that separates them (so-called lateral pulling), the degree of buckling is only slightly reduced within the range where the interlocking gap between the elements 31 and 31 is canceled out, and the close adhesion between them is maintained, thus preserving the good appearance of the slide fastener 1.

[0038] Next, a method for manufacturing a slide fastener according to this embodiment will be described. Figure 4 is a flowchart showing the method for manufacturing a slide fastener according to the first embodiment. Figure 5(a) is a schematic diagram showing the cross-section of the fastener tape and element row in the sewing process of Figure 4. Figure 5(b) is a schematic diagram showing the cross-section of the fastener tape and element row in the sewing process, setting process, and dyeing process of Figure 4. Figure 5(c) is a schematic diagram showing the cross-section of the fastener tape and element row in the folding process of Figure 4. Note that in Figures 5(a) to 5(c), the cross-sections of the fastener tape and element row after sewing are shown, but the sewing thread and the like are omitted.

[0039] As shown in Figure 4, the manufacturing method of the slide fastener 1 according to the first embodiment comprises a sewing process S1, a setting process S2, a dyeing process S3, and a folding process S4. Each process will be described in detail below.

[0040] First, in sewing process S1, as shown in Figure 5(a), with the first and second element rows 50 and 60 separated from each other, the first element row 50 is sewn to the back surface 11 of one end 10a in the width direction of the first fastener tape 10, and the second element row 60 is sewn to the back surface 21 of one end 20a in the width direction of the second fastener tape 20. Sewing process S1 results in the construction of a fastener stringer 3 consisting of the first fastener tape 10 and the first element row 50, and a fastener stringer 5 consisting of the second fastener tape 20 and the second element row 60.

[0041] In the sewing process S1 according to this embodiment, the temporary setting process described below may be performed. In the temporary setting process, as shown in Figure 5(b), the first and second element rows 50, 60 are interlocked with each other, and the overlapping portion of the fastener stringers 3, 5 is heated with the widthwise end 10a of the first fastener tape 10 and the widthwise end 20a of the second fastener tape 20 overlapping in the front-to-back direction. The purpose of the temporary setting process is to stabilize the shrinkage of the fabric in the overlapping portion of the fastener stringers 3, 5, or to suppress the occurrence of folds and wrinkles in that portion. When performing the temporary setting process, in the sewing process S1, after the fastener stringers 3, 5 are constructed respectively, when interlocking the first and second element rows 50, 60 with each other, the first and second fastener tapes 10, 20 are overlapped using a jig (not shown) such that the widthwise end 10a of the first fastener tape 10 partially covers the surface 23 side of the widthwise end 20a of the second fastener tape 20. After overlapping the first and second fastener tapes 10 and 20, a heated roll or flat plate is brought into contact with the surface 13 side of one end 10a of the first fastener tape 10 in the width direction, thereby primarily heating the end 10a of the first fastener tape 10 in the width direction.

[0042] Furthermore, in this embodiment, a setting process S2 is performed after the sewing process S1. In the setting process S2, as shown in Figure 5(b), the first and second element rows 50, 60 are interlocked with each other, and with one end 10a in the width direction of the first fastener tape 10 and one end 20a in the width direction of the second fastener tape 20 overlapping in the front-to-back direction, the first and second fastener tapes 10, 20 and the first and second element rows 50, 60, i.e., the entire fastener stringer 3, 5, are heated by dry heat. This heating treatment stabilizes the shape of the entire fastener stringer 3, 5, including the first and second fastener tapes 10, 20 and the first and second element rows 50, 60.

[0043] In the dyeing process S3 described later, the fastener stringers 3 and 5 are wrapped around a cylindrical beam and dyed while being heated at a high temperature of approximately 130°C. Therefore, by heating the fastener stringers 3 and 5 in the setting process S2 and shrinking the fibers in advance, it is possible to prevent the beam from being damaged by the shrinkage of the fastener stringers 3 and 5 during dyeing. In addition, stabilizing the fibers of the fastener stringers 3 and 5 makes it easier to dye them uniformly. The setting process S2 is also called the heat setting process.

[0044] Next, in the dyeing process S3, similar to the setting process S2, the first and second element rows 50 and 60 are interlocked, and the fastener stringers 3 and 5 are dyed with the widthwise end 10a of the first fastener tape 10 and the widthwise end 20a of the second fastener tape 20 overlapping in the front-to-back direction. In this embodiment, in the setting process S2 described above, the first and second element rows 50 and 60 are interlocked, and the widthwise end 10a of the first fastener tape 10 and the widthwise end 20a of the second fastener tape 20 overlapping in the front-to-back direction are maintained while dyeing is performed. In the dyeing process S3, for example, the fastener stringers 3 and 5 are wound around a cylindrical beam and dyed using a beam dyeing machine. At this time, dyeing under heated and pressurized conditions can also be used to further stabilize the shape of the fastener stringers 3 and 5.

[0045] Next, in the bending process S4, as shown in Figure 5(c), the first and second element rows 50 and 60 are interlocked, and the first fastener tape 10 and the second fastener tape 20 are bent so that one end 10a in the width direction of the first fastener tape 10 and one end 20a in the width direction of the second fastener tape 20 buckle in a curved shape and adhere closely to each other. In this embodiment, after the dyeing process S3, the first and second element rows 50 and 60 are separated once, and when the first and second element rows 50 and 60 are interlocked again, the first fastener tape 10 and the second fastener tape 20 are bent using a jig (not shown). As a result, a slide fastener 1 can be obtained in which one end 10a in the width direction of the first fastener tape 10 and one end 20a in the width direction of the second fastener tape 20 buckle in a curved shape and adhere closely to each other.

[0046] As described above, in the manufacturing method according to this embodiment, in the sewing process S1, the first element row 50 is sewn to the first fastener tape 10 and the second element row 60 is sewn to the second fastener tape 20 while the first element row 50 and the second element row 60 are separated. This allows the sliding fastener 1 according to this embodiment to be sewn in a state where one end 10a in the width direction of the first fastener tape 10 and one end 20a in the width direction of the second fastener tape 20 do not interfere with each other.

[0047] Furthermore, the setting process S2 and the dyeing process S3 are carried out with the first element row 50 and the second element row 60 engaged. This prevents variations in the pitch of the first and second element rows 50 and 60, i.e., the distance between elements 31 aligned in the longitudinal direction, even when heat, pressure, tension, etc., are applied to the slide fastener 1 during the setting process S2 and the dyeing process S3, while stabilizing the shape of the first and second fastener tapes 10 and 20 and the first and second element rows 50 and 60.

[0048] Furthermore, in the setting process S2 and the dyeing process S3, the widthwise end 10a of the first fastener tape 10 and the widthwise end 20a of the second fastener tape 20 are placed on top of each other in the front-to-back direction. In the slide fastener 1 according to this embodiment, the widthwise end 10a of the first fastener tape 10 and the widthwise end 20a of the second fastener tape 20 deform by pressing against each other in the width direction, causing them to buckle into a curved shape and adhere tightly. By preventing the curved buckled shape from becoming permanently fixed during the setting process S2 and the dyeing process S3, the widthwise end 10a of the first fastener tape 10 and the widthwise end 20a of the second fastener tape 20 can exhibit high adhesion when the slide fastener 1 is completed.

[0049] According to the manufacturing method for slide fasteners described above, a slide fastener 1 with an excellent appearance can be stably manufactured while avoiding interference between the first and second fastener tapes 10 and 20, in which one end 10a in the width direction of the first fastener tape 10 extends to one end in the width direction of the first element row 50, and one end 20a in the width direction of the second fastener tape 20 extends to one end in the width direction of the second element row 60.

[0050] (Second Embodiment) Figure 6 is a cross-sectional view of the main part of the slide fastener according to the second embodiment, showing the state in which the first and second element rows are interlocked. The slide fastener 1 according to the second embodiment differs from the first embodiment in that the first and second waterproof films 70 and 80 are provided on the first and second fastener tapes 10 and 20. The other components of the second embodiment are the same as those of the first embodiment, so their explanation is omitted or simplified by using the same reference numerals as in the first embodiment in the drawings.

[0051] As shown in Figure 6, the slide fastener 1 of the second embodiment further comprises a first watertight film 70 provided on the surface 13 of the first fastener tape 10 and a second watertight film 80 provided on the surface 23 of the second fastener tape 20. Therefore, the slide fastener 1 of this embodiment is a watertight fastener with watertight properties.

[0052] The left and right pairs of first and second waterproof films 70, 80 are each elongated in the same shape as the first and second fastener tapes 10, 20, and have a back surface 71, 81 and a front surface 73, 83 opposite to the back surface 71, 81. The first and second waterproof films 70 are formed to cover the entire surface 13, 23 of the first and second fastener tapes 10, 20. In this embodiment, the vertical and horizontal dimensions of the first and second waterproof films 70, 80 and the first and second fastener tapes 10, 20 are substantially the same.

[0053] The design ensures that when the first and second element rows 50 and 60 are engaged, the first and second fastener tapes 10 and 20 overlap the engagement center O, and the first and second waterproof films 70 and 80 also overlap the engagement center O. By arranging the first and second fastener tapes 10 and 20, the first and second waterproof films 70 and 80, and the first and second element rows 50 and 60 in this manner, when the first and second element rows 50 and 60 are engaged, the first and second fastener tapes 10 and 20 and the first and second waterproof films 70 and 80 buckle in a curved shape, allowing them to adhere tightly to each other.

[0054] Next, a method for manufacturing a slide fastener according to the second embodiment will be described. Figure 7 is a flowchart showing the method for manufacturing a slide fastener according to the second embodiment. Figure 8(a) is a schematic diagram showing the cross-section of the fastener tape, element row, and water-sealing film in the water-sealing film bonding step of Figure 7. Figure 8(b) is a schematic diagram showing the cross-section of the fastener tape, element row, and water-sealing film in the cutting step of Figure 7. Figure 8(c) is a view of the water-sealing film and fastener tape from the surface side in the cutting step of Figure 7. Figure 9(a) is a schematic diagram showing the cross-section of the fastener tape, element row, and water-sealing film in the water-repellent treatment step of Figure 7. Figure 9(b) is a schematic diagram showing the apparatus used in the water-repellent treatment step of Figure 7. Figure 9(c) is a schematic diagram showing the cross-section of the fastener tape, element row, and water-sealing film in the bending step and aging step of Figure 7. Figures 8(a), 8(b), 9(a), and 9(c) show cross-sections of the fastener tape and element row sewn together, but the sewing threads are omitted. Also, in Figure 9(b), the fastener tape and element row, i.e., the fastener stringer, are schematically shown as lines.

[0055] As shown in Figure 7, the manufacturing method of the slide fastener 1 of the second embodiment comprises a sewing step S1, a setting step S2, a dyeing step S3, a waterproof film bonding step S5, a cutting step S6, a water-repellent treatment step S7, a folding step S4, and an aging step S8. Each step will be described in detail below. Note that the sewing step S1, the setting step S2, and the dyeing step S3 are substantially the same as those of the first embodiment, so the explanation will focus on the waterproof film bonding step S5 and onward.

[0056] In the waterproof film bonding process S5, as shown in Figure 8(a), the first and second element rows 50 and 60 are separated from each other, and with one end 10a in the width direction of the first fastener tape 10 and one end 20a in the width direction of the second fastener tape 20 in close proximity, a single waterproof film 90 (first and second waterproof films 70 and 80) is bonded to the surface 13 of the first fastener tape and the surface 23 of the second fastener tape 20.

[0057] In this embodiment, the upper and lower pressure rolls 300 and 350 pressurize the fastener stringers 3 and 5, the adhesive (not shown), and the waterproof film 90 so as to sandwich them, thereby bonding a single waterproof film 90 to the surfaces 13 and 23 of the first and second fastener tapes 10 and 20. The upper pressure roll 300 is provided with two guide grooves 310 and 320, and the first and second element rows 50 and 60, which are separated from each other, are guided by the guide grooves 310 and 320. This ensures that the fastener stringers 3 and 5 are pressed in a stable state. After the waterproof film 90 is bonded, the fastener stringers 3 and 5 are left to rest for a certain period of time to stabilize the bond.

[0058] In this embodiment, thermosetting polyurethane is used for the water-stopping film 90, but the water-stopping film 90 can be any resin film that does not allow liquids such as water to penetrate, and preferably it is a film made of a thermosetting resin.

[0059] In cutting step S6, as shown in Figure 8(b), with the first and second element rows 50 and 60 separated from each other, the waterproof film 90 is cut by the cutting tool 400 along the gap G1 at a position directly above the gap G1 between the widthwise ends 10a and 20a of the first and second fastener tapes 10 and 20, thereby forming a pair of left and right first and second waterproof films 70 and 80.

[0060] Furthermore, when cutting, as shown in Figure 8(c), the fastener stringers 3 and 5 are pulled in the longitudinal direction (upper side in Figure 8(c)) while the fastener stringers 3 and 5 are separated in the left-right direction (left-right direction in Figure 8(c)) using the wedge-shaped jig 410 provided on the cutting tool 400. This allows for a clean finish to the cut surfaces of the first and second waterproof films 70 and 80. Moreover, it is preferable to use a fixed blade for the cutting tool 400.

[0061] In the water-repellent treatment step S7, as shown in Figure 9(a), the first and second element rows 50 and 60 are interlocked, and the widthwise ends 10a and 70a of the first fastener tape 10 and the first waterproof film 70 and the widthwise ends 20a and 80a of the second fastener tape 20 and the second waterproof film 80 are overlapped in the front-to-back direction. In this embodiment, after the cutting step S6, while interlocking the first and second element rows 50 and 60, a jig (not shown) is used to overlap the widthwise ends 10a and 70a of the first fastener tape 10 and the first waterproof film 70 and the widthwise ends 20a and 80a of the second fastener tape 20 and the second waterproof film 80 so that the widthwise end 10a of the first fastener tape 10 partially covers the surface 83 side of the widthwise end 80a of the second waterproof film 80.

[0062] In the water-repellent treatment process S7, for example, as shown in Figure 9(b), an immersion tank 600 for storing the water-repellent agent, a drying heat treatment chamber 700 for drying the water-repellent agent applied to the fastener stringers 3 and 5 and for heating to permeate and adhere the water-repellent agent to the fastener stringers 3 and 5, and a plurality of guide rollers 500 for passing the fastener stringers 3 and 5 into the immersion tank 600 and the drying heat treatment chamber 700 by changing the direction of movement of the fastener stringers 3 and 5. The fastener stringers 3 and 5 are fed in from the left side of Figure 9(b), and guided by the circumferential surface of the guide rollers 500, and then sequentially fed into the immersion tank 600 and the drying heat treatment chamber 700, thereby continuously applying, drying, and adhering the water-repellent agent.

[0063] In the bending process S4, as shown in Figure 9(c), the first and second element rows 50 and 60 are interlocked, and the first fastener tape 10 and the first waterproof film 70 and the second fastener tape 20 and the second waterproof film 80 are bent so that the widthwise ends 10a and 70a of the first fastener tape 10 and the first waterproof film 70 and the widthwise ends 20a and 80a of the second fastener tape 20 and the second waterproof film 80 buckle in a mountain shape and adhere closely to each other. In this embodiment, after the water-repellent treatment process S7, the first and second element rows 50 and 60 are separated once, and when the first and second element rows 50 and 60 are interlocked again, the widthwise ends 10a and 70a of the first fastener tape 10 and the first waterproof film 70 and the widthwise ends 20a and 80a of the second fastener tape 20 and the second waterproof film 80 are bent using a jig (not shown).

[0064] In the aging process S8, the first and second element rows 50 and 60 interlock with each other, and the fastener stringers 3 and 5 are left to rest for a certain period of time with the widthwise ends 10a and 70a of the first fastener tape 10 and the first waterproof film 70 and the widthwise ends 20a and 80a of the second fastener tape 20 and the second waterproof film 80 buckling in a curved shape and in close contact with each other. When the fastener stringers 3 and 5 are equipped with the first and second waterproof films 70 and 80, the buckled portion becomes harder compared to when the first and second waterproof films 70 and 80 are not equipped with them. Therefore, it is desirable to maintain the curved buckled shape for a certain period of time to allow the buckling to set in place. This makes it possible to obtain a slide fastener 1 in which the widthwise ends 10a and 70a of the first fastener tape 10 and the first waterproof film 70 and the widthwise ends 20a and 80a of the second fastener tape 20 and the second waterproof film 80 buckle in a curved shape and are in close contact with each other.

[0065] As described above, in this embodiment, the waterproof film bonding process S5 and the cutting process S6 are performed with the first and second element rows 50 and 60 separated. This allows the first and second waterproof films 70 and 80 to be bonded to the first fastener tape 10 and the first waterproof film 70, while avoiding interference between the widthwise ends 10a and 70a of the first fastener tape 10 and the first waterproof film 70 and the widthwise ends 20a and 80a of the second fastener tape 20 and the second waterproof film 80.

[0066] Furthermore, in the cutting step S6 of this embodiment, a fixed blade is used that offers superior stability compared to the rotating blade used in the cutting step S6 of a typical reverse-use slide fastener manufacturing method. This ensures accuracy during cutting, even in this embodiment where the water-stopping film 90 is cut in a state where the first and second element rows 50 and 60 are separated, which is less stable than when the first and second element rows 50 and 60 are interlocked.

[0067] According to the manufacturing method for the slide fastener of the second embodiment described above, a slide fastener 1 with excellent appearance and water-sealing properties can be stably manufactured, in which one end 10a, 70a in the width direction of the first fastener tape 10 and the first water-sealing film 70 extends to one end in the width direction of the first element row 50, and one end 20a, 80a in the width direction of the second fastener tape 20 and the second water-sealing film 80 extends to one end in the width direction of the second element row 60.

[0068] It should be noted that the present invention is not limited to the manufacturing method of the above embodiment and can be modified as appropriate. For example, although the water-repellent treatment step S7 is not performed in the manufacturing method of the first embodiment, the water-repellent treatment step S7 may be performed on the slide fastener 1 of the first embodiment that does not have the first and second water-sealing films 70, 80. Furthermore, the method of performing each step can be any method that can stably manufacture the slide fastener 1 by setting conditions such as whether the first and second element rows 50, 60 are interlocked or separated, or the arrangement relationship of one end 10a in the width direction of the first fastener tape 10 and one end 20a in the width direction of the second fastener tape 20 as described above. In other words, the dyeing method of the fastener stringers 3, 5, the method of bonding and cutting the water-sealing film 90, the method of bending the first and second fastener tapes 10, 20 etc. using a jig, etc. can be modified as appropriate.

[0069] As described above, the following matters are disclosed in this specification: [1] A pair of first and second fastener tapes (10, 20) and A first element row (50) is provided at one end (10a) in the width direction of the first fastener tape (10), A second row of elements (60) is provided at one end (20a) in the width direction of the second fastener tape (20), Equipped with, The first and second element rows (50, 60) are interlocking and separable from one another. When the first and second element rows (50, 60) interlock with each other, one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) buckle in a curved shape and come into close contact with each other. A method for manufacturing a slide fastener (1), With the first and second element rows (50, 60) separated from each other, the sewing process (S1) involves sewing the first element row (50) to the first fastener tape (10) and sewing the second element row (60) to the second fastener tape (20). The first and second element rows (50, 60) are interlocked with each other, and with one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) overlapping in the front-back direction, the first and second fastener tapes (10, 20) and the first and second element rows (50, 60) are dyed in a dyeing step (S3). A bending step (S4) is performed to bend the first fastener tape (10) and the second fastener tape (20) so that when the first and second element rows (50, 60) interlock with each other, one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) buckle in a mountain shape and come into close contact with each other. Equipped with A method for manufacturing a slide fastener (1), characterized by the above. According to this configuration, one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) buckle in a mountain shape and adhere closely to each other, providing a method for manufacturing a slide fastener (1) that has excellent concealment of the element row and, consequently, an excellent appearance.

[0070] [2] The sewing process (S1) includes a temporary setting process in which the first and second element rows (50, 60) are interlocked with each other, and one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) are overlapped in the front-back direction, and the end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) are heated. A method for manufacturing a slide fastener (1) as described in [1], characterized by the above. This configuration makes it possible to stabilize the shrinkage of the fabric in the overlapping portion of the first and second fastener tapes (10, 20), or to suppress the occurrence of folds and wrinkles in that portion.

[0071] [3] After the sewing process (S1), The first and second element rows (50, 60) are interlocked with each other, and with one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) overlapping in the front-to-back direction, the first and second fastener tapes (10, 20) and the first and second element rows (50, 60) are heated in a setting step (S2). Furthermore, it is equipped with A method for manufacturing a slide fastener (1) according to [1] or [2], characterized by the present invention. This configuration stabilizes the overall shape of the first and second fastener tapes 10, 20 and the first and second element rows 50, 60, making it easier to carry out the dyeing process (S3).

[0072] [4] After the dyeing step (S3), The first and second element rows (50, 60) are separated from each other, and one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) are brought into close proximity. A waterproof film bonding step (S5) is performed by bonding a single waterproof film (90) to the first and second fastener tapes (10, 20), A cutting step (S6) is performed to cut the water-stopping film (90) along the gap (G1) between the widthwise ends (10a, 20a) of the first and second fastener tapes (10, 20) to form the first and second water-stopping films (70, 80), Furthermore, it is equipped with A method for manufacturing a slide fastener (1) according to any one of [1] to [3], characterized by the above. According to this configuration, by providing the first and second waterproof films (70, 80), a method for manufacturing a slide fastener (1) with excellent waterproofing properties can be provided.

[0073] [5] After the bending process (S4), The invention further comprises an aging step (S8) in which the first and second element rows (50, 60) are interlocked with each other, and one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) are buckled in a mountain shape and left to rest in close contact with each other for a certain period of time. A method for manufacturing the slide fastener (1) described in [4], characterized by the present invention. This configuration allows for stabilizing the shape of the first and second fastener tapes (10, 20) equipped with the first and second waterproof films (70, 80), thereby improving adhesion.

[0074] [6] Before the bending process (S4), The device further comprises a water-repellent treatment step (S7) in which the first and second element rows (50, 60) are interlocked, one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) are overlapped in the front-back direction, a water-repellent agent is applied, and the applied water-repellent agent is dried. A method for manufacturing a slide fastener (1) according to any one of [1] to [5], characterized by the above. This configuration allows for a manufacturing method of a slide fastener (1) that offers superior water-stopping properties through water-repellent treatment. [Explanation of symbols]

[0075] 1. Slide fastener 3.5 Zipper stringer 10. First fastener tape 10a One end in the width direction 10b One end face in the width direction 11 Back side 13 Surface 20. Second fastener tape 20a One end in the width direction 20b One end face in the width direction 21 Back side 23 Surface 31 Elements 31a Interlocking head 31b 1st leg 31c 2nd leg 31d Connecting part 31e One end in the width direction 31f One end in the width direction 32 Core string 33 Sewing thread 40 Slider 41 Torso 42 Handle mounting section 43 Pull handle 50 First Element Column 60 Second Element Row 70. First waterproofing film 70a One end in the width direction 70b One end face in the width direction 71 Back side 73 Surface 80 Second waterproofing film 80a One end in the width direction 80b One end in the width direction 81 Back side 83 Surface 90 Waterproof film 300 Upper crimping roll 310,320 Guide grooves 350 Lower crimping roll 400 Cutting tools 410 Jig 500 Guide Rollers 600 Soaking tank 700 Drying Heat Treatment Room O meshing center O1,O2 position F1,F2 plane T1 1st space T2 2nd space G1 Gap

Claims

1. A pair of first and second fastener tapes (10, 20), A first element row (50) is provided at one end (10a) in the width direction of the first fastener tape (10), A second row of elements (60) is provided at one end (20a) in the width direction of the second fastener tape (20), Equipped with, The first and second element rows (50, 60) are interlocking and separable from one another. When the first and second element rows (50, 60) interlock with each other, one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) buckle in a curved shape and come into close contact with each other. A method for manufacturing a slide fastener (1), With the first and second element rows (50, 60) separated from each other, the sewing process (S1) involves sewing the first element row (50) to the first fastener tape (10) and sewing the second element row (60) to the second fastener tape (20). The first and second element rows (50, 60) are interlocked with each other, and with one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) overlapping in the front-to-back direction, the first and second fastener tapes (10, 20) and the first and second element rows (50, 60) are dyed in a dyeing step (S3). A bending step (S4) is performed to bend the first fastener tape (10) and the second fastener tape (20) so that when the first and second element rows (50, 60) interlock with each other, one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) buckle in a mountain shape and come into close contact with each other. Equipped with A method for manufacturing a slide fastener (1), characterized by the above.

2. The sewing process (S1) includes a temporary setting process in which the first and second element rows (50, 60) are interlocked with each other, and one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) are overlapped in the front-back direction, and the end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) are heated. A method for manufacturing a slide fastener (1) according to claim 1, characterized in that

3. After the sewing process (S1), The first and second element rows (50, 60) are interlocked with each other, and with one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) overlapping in the front-back direction, the first and second fastener tapes (10, 20) and the first and second element rows (50, 60) are heated in a setting step (S2). To further enhance A method for manufacturing a slide fastener (1) according to claim 1, characterized in that

4. After the dyeing process (S3), The first and second element rows (50, 60) are separated from each other, and one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) are brought into close proximity. A waterproof film bonding step (S5) is performed by bonding a single waterproof film (90) to the first and second fastener tapes (10, 20), A cutting step (S6) is performed to cut the water-stopping film (90) along the gap (G1) between the widthwise ends (10a, 20a) of the first and second fastener tapes (10, 20) to form the first and second water-stopping films (70, 80), To further enhance A method for manufacturing a slide fastener (1) according to claim 1, characterized in that

5. After the bending process (S4), The invention further comprises an aging step (S8) in which the first and second element rows (50, 60) are interlocked with each other, and one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) are buckled in a mountain shape and left to rest in close contact with each other for a certain period of time. A method for manufacturing a slide fastener (1) according to claim 4, characterized in that

6. Before the bending process (S4), The device further comprises a water-repellent treatment step (S7) in which the first and second element rows (50, 60) are interlocked with each other, and a water-repellent agent is applied with one end (10a) in the width direction of the first fastener tape (10) and one end (20a) in the width direction of the second fastener tape (20) overlapping in the front-back direction, and the applied water-repellent agent is dried. A method for manufacturing a slide fastener (1) according to any one of claims 1 to 5, characterized in that

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