Hot-melt sewing thread, waterproof joint structure using hot-melt sewing thread, end fixing structure using hot-melt sewing thread, and manufacturing method thereof

Abstract

The heat-fusion sewing thread (S1) has: a baseline (Sa); a first heat-fusion thread (Sb) containing a heat-fusion component and twisted relative to the baseline (Sa) in either an S-twist or a Z-twist direction; and a second heat-fusion thread (Sc) containing a heat-fusion component and twisted relative to the baseline (Sa) in a direction different from the first heat-fusion thread (Sa) to the outer periphery of the first heat-fusion thread (Sa).

Description

Technical Field

[0001] This invention relates to heat-fusion sewing thread, waterproof joint structure using heat-fusion sewing thread, end fixing structure using heat-fusion sewing thread, and methods for manufacturing the same. Background Technology

[0002] Typically, for sewing and / or bonding of fabrics, hot-melt thread consisting only of molten components and melting upon application of heat after sewing is known to be used.

[0003] Reference 1 discloses a sewing thread with heat-fusion properties (heat-fusion sewing thread), which is formed by aligning or twisting a baseline without heat-fusion components and a heat-fusion line.

[0004] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 7-216727 Summary of the Invention

[0005] Technical issues When using only the aforementioned heat-fused thread to bond fabrics together, no sewing thread remains after the heat-fused thread melts, and the stitch strength is easily reduced compared to sewing with the baseline. Regarding the heat-fused sewing thread cited in Reference 1, for example, when sewing with a sewing machine, the baseline and heat-fused thread sometimes easily separate when the heat-fused thread passes through the needle eye, making stable sewing difficult; there is room for improvement.

[0006] The objective of this invention is to provide a heat-fusion sewing thread that can stably sew while possessing stitch strength.

[0007] Technical solution One aspect of the present invention provides a heat-fusion weldable sewing thread, the heat-fusion weldable sewing thread having: Baseline; The first hot-melt thread, comprising a hot-melt component, is twisted relative to the baseline in either an S-twist or a Z-twist direction; and The second hot-melt wire includes a hot-melt component and is twisted relative to the baseline in a direction different from the first hot-melt wire to the outer periphery of the first hot-melt wire.

[0008] According to the present invention, since the twisting direction and untwisting direction of the first and second heat-fused threads are opposite, the thread is less prone to unraveling or unevenness compared to the case where the twisting direction is consistent. Therefore, even when sewing is performed using a sewing machine or the like, the baseline, the first heat-fused thread, and the second heat-fused thread are difficult to separate, enabling stable sewing while utilizing the baseline remaining in the sewn section to achieve stitch strength.

[0009] Technical effect According to the present invention, a heat-fusion sewing thread that can stably sew while possessing stitch strength can be provided. Attached Figure Description

[0010] Figure 1 This is an explanatory diagram illustrating the structure of the heat-fusion sewing thread of the present invention.

[0011] Figure 2 It is a schematic diagram showing a sewing needle and thread hole.

[0012] Figure 3 This is a top view showing an end-fixing structure in the case of applying heat-fusion sewing thread to a lockstitch that wraps the ends of two pieces of fabric.

[0013] Figure 4 This is an explanatory diagram showing the state after the first and second fabrics are sewn together.

[0014] Figure 5 A top view used to illustrate the sewing process of two pieces of fabric with end-fixing structures.

[0015] Figure 6 It is schematically shown along Figure 3 A sectional view of the section along line VI-VI.

[0016] Figure 7 These are images of the bonding seam line and its surrounding area, captured using a scanning electron microscope.

[0017] Figure 8 It is schematically shown along Figure 7 A cross-sectional view of the section along line VIII-VIII.

[0018] Figure 9 This is a cross-sectional view showing a modified example of the end seam portion.

[0019] Figure 10 This is a top view showing the waterproof joint structure of the present invention using heat-fused sewing thread.

[0020] Figure 11 This is an explanatory diagram showing the state of the first piece of fabric after it has been sewn together.

[0021] Figure 12 This is a top view illustrating the sewing process of a waterproof joint structure using the heat-fusion sewing thread of the present invention.

[0022] Figure 13 It is along Figure 12 A cross-sectional view of line XIII-XIII in the diagram.

[0023] Figure 14 This is an explanatory diagram used to illustrate the composition of the first seam line.

[0024] Figure 15 It is a schematic diagram showing a sewing needle and thread hole.

[0025] Figure 16 It is schematically shown along Figure 10 A cross-sectional view of the section along line XVI-XVI.

[0026] Figure 17 These are images of the bonding seam line and its surrounding area, captured using a scanning electron microscope.

[0027] Figure 18 It is schematically shown along Figure 8 A cross-sectional view of the section along line XVIII-XVIII.

[0028] Figure 19 This is a cross-sectional view of the end seam portion in the first modified example.

[0029] Figure 20 This is a cross-sectional view of the end seam portion in the second variation.

[0030] Figure 21 This is a cross-sectional view of the end seam portion in the third variation.

[0031] Figure 22 This is a top view of the suture section in the fourth variation.

[0032] Figure 23 This is a sectional view of the suture section in the fifth variation.

[0033] Figure 24 This is a top view showing two sewn pieces of fabric having the end-fixing structure of the present invention using heat-fusion sewing thread.

[0034] Figure 25 This is an explanatory diagram showing the state after the first and second fabrics are sewn together.

[0035] Figure 26 This is a top view illustrating the sewing process of two pieces of fabric having the end-fixing structure of the heat-fusion sewing thread of the present invention.

[0036] Figure 27 This is an explanatory diagram used to illustrate the construction of the overlock stitch.

[0037] Figure 28 It is a schematic diagram showing a sewing needle and thread hole.

[0038] Figure 29 It is schematically shown along Figure 24 A cross-sectional view of the section of line XXIX-XXIX in the image.

[0039] Figure 30 Images of the bonding seam line and its surrounding area taken using a scanning electron microscope.

[0040] Figure 31 It is schematically shown along Figure 30 A sectional view of the section along line XXXI-XXXI.

[0041] Figure 32 (a) is a magnified partial photograph showing the periphery of the suture portion in a conventional structure without an end fixing portion. Figure 32 (b) is a partial enlarged photograph showing the periphery of the suture portion of the end-fixing structure of the present invention having an end-fixing portion.

[0042] Figure 33 This is a cross-sectional view showing a modified example of the end seam portion. Detailed Implementation

[0043] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0044] [First Implementation Method] Figure 1 This is an enlarged schematic diagram showing a single heat-fusion sewing thread S1 according to an embodiment of the present invention. Figure 1 As shown, in this embodiment, the sewing thread S1 is composed of a thread including a first heat-fusion connector Sb and a second heat-fusion connector Sc.

[0045] The heat-fusion sewing thread S1 is constructed by spirally winding a first heat-fusion thread Sb and a second heat-fusion thread Sc, which contain heat-fusion components, around a baseline Sa, which does not contain heat-fusion components. In this embodiment, the baseline Sa is, for example, made of polyester double-twisted or triple-twisted yarn (such as filament yarn with a thickness of 75 dtex or more and 80 dtex, formed by triple-twisting filament yarn composed of 24 single threads). The first heat-fusion thread Sb and the second heat-fusion thread Sc can be polyamide-based fusion threads, such as filament yarn with a thickness of 75 dtex or more and 80 dtex, formed by twisting 5 single threads together. Filament yarn refers to yarn made by twisting multiple long fibers together. dtex (dectex) is a SI unit for expressing the thickness of filament yarn (long fiber). The thickness of a yarn with a length of 10,000 m and a weight of 1 g is called 1 dtex. The weight ratio of the first heat-fusion thread Sb and the second heat-fusion thread Sc relative to the heat-fusion sewing thread S1 can be set to more than 25% and less than 50%, for example, 39%.

[0046] The melting temperature of the first hot-melt wire Sb and the second hot-melt wire Sc can be set to above 100 degrees and below 200 degrees, for example, 120 degrees or 130 degrees.

[0047] like Figure 1 As shown, the first hot-melt wire Sb and the second hot-melt wire Sc have a lower hot-melt wire Sb, which is a first hot-melt wire covering the baseline Sa, and an upper hot-melt wire Sc, which is a second hot-melt wire covering the lower hot-melt wire Sb. From the viewpoint of sewing feasibility, the twisting directions of the lower hot-melt wire Sb and the upper hot-melt wire Sc relative to the baseline Sa are preferably opposite. In this embodiment, the twisting direction of the lower hot-melt wire Sb is an S-twist (right twist) relative to the baseline Sa. The twisting direction of the upper hot-melt wire Sc is a Z-twist (left twist) relative to the baseline Sa. The twist count of the lower hot-melt wire Sb and the upper hot-melt wire Sc can be set to 450 times / m or more and 550 times / m or less. In this embodiment, the twist count is set to about 500 times / m. The twist angle α of the lower hot-melt wire Sb can be set to 10 degrees or more and 30 degrees or less. In this embodiment, it is set to about 20 degrees. The twist angle β of the upper hot-melt wire Sc can be set to 10 degrees or more and 30 degrees or less. In this embodiment, it is set to about 20 degrees. In this embodiment, each twisting angle α and β refers to the angle formed by the axis X1 of the baseline Sa and the lower hot-melt wire Sb or the upper hot-melt wire Sc.

[0048] Figure 2 This is a cross-sectional view, enlarged and schematically shown, of the periphery of the thread hole 61 of the sewing needle 6 through which the heat-welding sewing thread S1 passes. (See image.) Figure 3As shown, the thread hole 61 of the sewing needle 6 has a generally elliptical shape with a major axis 61a and a minor axis 61b. To reduce the diameter d of the needle hole produced when sewing two pieces of fabric, the width d1 of the sewing needle 6 is preferably small. On the other hand, the thread hole 61 is preferably larger than the width d1 of the sewing needle 6. For example, a No. 14 sewing machine needle manufactured by Organ Needle Co., Ltd. can be used, where the width d1 of the No. 14 needle is 0.8 mm relative to the width of the sewing needle 6, the length of the major axis 61a of the thread hole 61 is set to approximately 0.8 mm, and the length of the minor axis 61b of the thread hole 61 is set to approximately 0.3 mm. In this embodiment, the width d1 of the sewing needle 6 refers to the width of the portion where the minor axis 61b is located in the longitudinal direction of the sewing needle 6.

[0049] like Figure 2 As shown, the diameter Z1 of the heat-fusion sewing thread S1 indicated by the double-dotted line is set to be more than 0.35 times and less than 0.9 times the length Z of the major axis 61a of the thread hole 61 of the sewing needle 6, for example, it can be set to 0.5 times.

[0050] Figure 3 The diagram shows an end-fixing structure 1 in which the heat-fusion sewing thread S1 of one embodiment of the present invention is used as an overlock thread to fix the ends of two pieces of fabric 2, 3.

[0051] like Figure 3 As shown, the end fixing structure 1 of the present invention includes: a first fabric 2 having a first end 21; a second fabric 3 having a second end 31; an overlock stitch S1 that covers the first end 21 and the second end 31; a sewing part 4 that sews the first end 21 and the second end 31 together; and an end bonding part 5 that folds down one side of the first end 21 and the second end 31 and bonds them to the main body 30 of the second fabric 3. In this embodiment, the sewing part 4 sews the first fabric 2 and the second fabric 3 together by a flat stitch.

[0052] "Flat seam" refers to a sewing method, as described in JIS L0122, in which two or more pieces of fabric are overlapped face to face and sewn together from the back side. In other words, the seam 4 overlaps the first fabric 2 and the second fabric 3 face to face and sewn together from the back side.

[0053] The first fabric 2 and the second fabric 3 are, for example, made of woven and / or knitted fabrics. The first fabric 2 and the second fabric 3 are, for example, made of 100% polyester, a synthetic fiber. It should be noted that this heat-fused-to-weld thread can bond not only synthetic fibers but also natural fibers.

[0054] like Figure 4As shown, the first end 21 is located on one side of the width direction of the first fabric 2. The second end 31 is located on one side of the width direction of the second fabric 3. The first end 21 and the second end 31 are overlocked with overlock thread S1. In this embodiment, the first end 21 and the second end 31 are integrally overlocked with overlock thread S1.

[0055] The overlock stitches at the first end 21 and the second end 31 are, for example, edge overlock stitches performed by a single-needle three-thread overlock sewing machine. The plurality of loops L1, L2 constituting the overlock stitch have a first loop L1 located on the back surface 2b of the first fabric 2 and a second loop L2 located on the back surface 3b of the second fabric 3. The first loops L1 and the second loops L2 extend consecutively and adjacently along the edges 2a, 3a of the first fabric 2 and the second fabric 3.

[0056] The overlock stitch S1 has a first back overlock stitch S11 located on the back side 2b of the first fabric 2, and a second back overlock stitch S12 located on the back side 3b of the second fabric 3. The first back overlock stitch S11 forms a plurality of first loops L1 continuously along the length direction on the back side 2b of the first fabric 2. The second back overlock stitch S12 forms a plurality of second loops L2 continuously along the length direction on the back side 3b of the second fabric 3.

[0057] The distance P1 between each first thread loop L1 and each second thread loop L2 can be set to 0.5mm or more and 3.0mm or less; in this embodiment, it is set to 1.0mm or 2.0mm. The distance P1 between the first thread loops L1 and the second thread loops L2 is equivalent to the feed spacing (stitch pitch) of the overlock sewing machine, which is the distance in the length direction between adjacent first thread loops L1 and between adjacent second thread loops L2. When the distance P1 is 2.0mm, the number of stitches is 14 stitches / 3cm; when the distance P1 is 3.0mm, the number of stitches is 22 stitches / 3cm. Here, the number of stitches refers to the number of stitches within a 3cm interval.

[0058] The width W1 of each first thread loop L1 and each second thread loop L2 can be set to be more than 5mm and less than 8mm, for example, 6mm. The width W1 of each first thread loop L1 and each second thread loop L2 is equivalent to the swing width of the overlock sewing machine, which is the interval distance from the edge portions 2a and 3a of the first fabric 2 and the second fabric 3 to the end portions L11 and L21 of each first thread loop L1 and the second thread loop L2 on the side away from the edge portions 2a and 3a.

[0059] A needle thread S3 is disposed at the ends L11 and L21 of each first loop L1 and each second loop L2. The needle thread S3 connects adjacent first loops L1 and adjacent second loops L2 to each other, thereby making the stitch continuous in the length direction. In this embodiment, the needle thread S3 includes a right needle thread S31 located on the edge portion 2a and 3a side and a left needle thread S32 located on the side away from the edge portion 2a and 3a.

[0060] Using needle and thread S3, multiple first loops L1 and second loops L2 are secured to the first fabric 2 and the second fabric 3, preventing adjacent first loops L1 from separating in the longitudinal direction. The multiple first loops L1 and second loops L2 are continuous in the longitudinal direction at their ends L11 and L21 via needle and thread S3. The first backlock stitch S11 and the second backlock stitch S12 intersect at the edge 2a. The multiple first loops L1 and second loops L2 are continuous in the longitudinal direction at the edge 2a.

[0061] exist Figure 3 The image shows a sewing process in which the first fabric 2 and the second fabric 3 are sewn together by a plain stitch after the first end 21 and the second end 31 have been overlocked. Figure 3 For ease of explanation, the first end 21 and the second end 31 are shown offset from each other, and the overlock stitch (overlock line S1) of the first end 21 and the second end 31 is simply shown. Figure 3 As shown, with the front face 2c of the first fabric 2 and the front face 3c of the second fabric 3 facing each other and the edges 2a and 3a of the first fabric 2 and the second fabric 3 aligned with each other, the first fabric 2 and the second fabric 3 are sewn together by the seam line S4. Thus, the seam portion 4 is formed.

[0062] Figure 6 Therefore, along Figure 3 The cross-section of line VI-VI schematically shows the cross-sectional view of the seam 4 and the end adhesive portion 5. (See diagram below.) Figure 5 As shown, the end bonding portion 5 is formed in the following manner: after the first end 21 and the second end 31 are sewn together, while the second fabric 3 is folded back to the side opposite to the direction of extension of the first fabric 2, the first end 21 and the second end 31 are bent over on one side, so that they are heat-fused to the back side 3b of the second fabric 3 at 100 to 200 degrees.

[0063] In the end bonding portion 5, the hot-melt wires Sb and Sc of the locking edge S1 melt due to heat and are then cooled, bonding the first end 21 and the second end 31 to the main body 30. In the end bonding portion 5, adhesive 91 is distributed from the molten hot-melt wires Sb and Sc of the locking edge S1. More specifically, as... Figure 7As shown, the first end 21 and the second end 31, after being heat-fused by the hot-melt seams Sb and Sc, are sewn together by the baseline Sa of the overlock line S1 and bonded together using the hot-melt seams Sb and Sc. The end bonding portion 5 is the portion of the second fabric 3 whose first end 21 and the second end 31 are bonded to the main body portion 30 using adhesive 91 distributed in the bonding portion overlock line portion 51 along the overlock line S1.

[0064] like Figure 4 and Figure 7 As shown, for example, the end-bonding portion 5 is disposed between the edges 2a and 3a of the first fabric 2 and the second fabric 3 and the ends L11 and L21 of the first loop L1 and the second loop L2. The width of the end-bonding portion 5 is approximately the same as the width W1 of the first loop L1 or the second loop L2. For example, when the ends are bonded using seam tape or the like, a substrate is disposed on the side of the seam tape opposite to the bonding surface at the end-bonding portion, but in this embodiment, the end-bonding portion 5 does not have a substrate disposed thereon.

[0065] Figure 7 This is an image of the bonding seam line portion 51 and its surrounding area, taken using a scanning electron microscope (SEM) (Hitachi Advanced Technology Co., Ltd. Miniscope™ 3000). The SEM image was set to 30x magnification. Figure 7 As shown, in the end bonding portion 5, the amount of first adhesive 91 distributed in the bonding portion locking line portion 51 along the locking line S1 (baseline Sa) is greater than the amount of second adhesive 92 distributed in other portions R. In this embodiment, the bonding portion locking line portion 51 is the area including the portion 51 where the locking line S1 is disposed and the surrounding 52.

[0066] like Figure 8 As shown, the amount of adhesive 91 can be, for example, the thickness of adhesive 91 layered on the first fabric 2 and the second fabric 3. The thickness t1 of adhesive 91 distributed in the overlock seam portion 51 of the adhesive part is thicker than the thickness t2 of adhesive 92 distributed in other portions R.

[0067] In this embodiment, the overlock thread portion 51 of the adhesive part is sewn using a sewing machine. The sewing speed of the overlock thread portion 51 of the adhesive part can be adjusted by the rotation speed of the sewing machine motor. The rotation speed of the sewing machine motor can be set to 3000 rpm or more and 8000 rpm or less, for example, 4000 rpm.

[0068] Next, the manufacturing method of the end fixing structure 1 of the two sewn fabric pieces 2 and 3 will be explained.

[0069] like Figure 5As shown, prepare a first fabric 2 and a second fabric 3. Overlap the first fabric 2 and the second fabric 3 with their right sides facing each other. Sew the first end 21, which is one end of the first fabric 2 in the width direction, and the second end 31, which is one end of the second fabric 3 in the width direction, together with an overlock thread S1 including heat-sealing seams Sb and Sc.

[0070] like Figure 5 As shown, the seam portion 4 is formed by sewing the first end 21 and the second end 31 together with suture S4. Figure 3 and Figure 6 As shown, with the first end 21 and the second end 31 bent over on one side, the first end 21 and the second end 31 are bonded to the back surface 3b of the main body 30 of the second fabric 3, forming an end bonding portion 5, thereby obtaining the end fixing structure 1 of the two sewn fabrics 2 and 3. As for the heating method for applying heat to the first end 21 and the second end 31, for example, hot pressing (heating, pressurizing, and cooling), ultrasonic heating (using ultrasonic vibration to vibrate the first end 21 and the second end 31 and using the frictional heat generated between the ends due to vibration to melt the heat-fused seams Sb and Sc for bonding), and high-frequency heating (using high-frequency energy (electromagnetic waves) to heat through molecular-level potential movement) can be used. These heating methods can be appropriately selected considering the fabric thickness, the number of overlapping pieces of the fabric (distance from the fabric surface to the weld line), and production efficiency, or multiple heating methods can be combined.

[0071] With the above configuration, the heat-fusion sewing thread S1 of this embodiment has the following effects.

[0072] The heat-fusion sewing thread S1 of this embodiment has: a baseline Sa; a first heat-fusion thread Sb containing a heat-fusion component and twisted relative to the baseline Sa with an S-twist; and a second heat-fusion thread Sc containing a heat-fusion component and twisted relative to the baseline Sa with a Z-twist to the outer periphery of the first heat-fusion thread Sb.

[0073] According to this configuration, since the twisting and untwisting directions of the first heat-fusion thread Sb and the second heat-fusion thread Sc are opposite, the heat-fusion sewing thread S1 is less prone to unraveling or unevenness during sewing compared to the case where the twisting directions are consistent. Therefore, even when sewing with a sewing machine, the baseline, the first heat-fusion thread, and the second heat-fusion thread are difficult to separate, allowing for stable sewing while maintaining stitch strength using the baseline remaining in the sewn section. In this embodiment, since the twisting direction of the first heat-fusion thread Sb is set to S-twist and the twisting direction of the second heat-fusion thread Sc is set to Z-twist, untwisting is less likely to occur when sewing with a sewing machine. In other words, from the viewpoint of sewing feasibility, it is preferable to set the twisting direction of the first heat-fusion thread Sb to S-twist and the twisting direction of the second heat-fusion thread Sc to Z-twist.

[0074] As in the embodiment, when the heat-fusion sewing thread S1 is used as a serger thread to sew the ends 21 and 31 of two pieces of fabric (first fabric 2 and second fabric 3), and the ends 21 and 31 are bent over on one or both sides, by melting the first heat-fusion thread Sb and the second heat-fusion thread Sc after sewing, the ends 21 and 31 of the first fabric 2 and the second fabric 3 can be fixed to the main body 30 of the second fabric 3 using the adhesive 91 distributed along the heat-fusion sewing thread S1. In addition, even when the first heat-fusion thread Sb and the second heat-fusion thread Sc are melted, the baseline Sa remains in the sewed portion, thus suppressing the detachment of the ends due to years of deterioration, as is the case where the ends of the fabric are only fixed by adhesive.

[0075] Since the adhesive 91, after melting at the first hot-melt joint Sb and the second hot-melt joint Sc, is distributed along the first hot-melt joint Sb and the second hot-melt joint Sc, excessive adhesive distribution can be suppressed compared to the case where hot-melt adhesive or other tape components are integrally disposed at the ends of the fabric. Therefore, the ends of the fabric can be aesthetically secured while suppressing fabric hardening and weight increase. Because the ends of the fabric are sewn together, the seam allow for uninterrupted continuity in the extension direction of the overlock line S1, enabling more effective fixation of the ends 21, 31 of the first fabric 2 and the second fabric 3 to the main body 30 of the second fabric 3.

[0076] The weight of the first heat-fusion thread Sb and the second heat-fusion thread Sc is more than 25% and less than 50% of the weight of the heat-fusion sewing thread S1.

[0077] According to this configuration, the ratio of the first heat-fusion thread and the second heat-fusion thread included in the sewing thread can be appropriately set. For example, when sewing the ends of two pieces of fabric together with the sewing thread and performing a single-sided or double-sided folding, if the ratio of the heat-fusion thread included in the sewing thread is less than 25%, the amount of molten adhesive distributed along the sewn portion where the sewing thread is arranged may become insufficient, resulting in insufficient adhesive strength or adhesive area, and the ends of the fabric may easily peel off from the main body of the fabric.

[0078] If the proportion of the first heat-fusion thread and the second heat-fusion thread in the sewing thread exceeds 50%, then if the thickness of the sewing thread is set to be constant, the thickness of the baseline will become thinner and the stitch strength will easily become weaker.

[0079] The melting temperature of the first hot-melt wire Sb and the second hot-melt wire Sc is above 100 degrees and below 200 degrees.

[0080] According to this configuration, the melting temperatures of the first heat-sealing thread Sb and the second heat-sealing thread Sc can be appropriately set. When the melting temperature is below 100 degrees Celsius, the first heat-sealing thread Sb and the second heat-sealing thread Sc may sometimes melt due to the increased temperature of the sewing needle caused by frictional heat between the sewing needle and the fabric during sewing. Additionally, melting during ironing, roller drying, etc., may lead to a decrease in adhesive properties. If the melting temperature exceeds 200 degrees Celsius, colorfastness typically decreases, the fabric is prone to discoloration, and sometimes the fabric itself may melt.

[0081] The twist count of the first hot melt wire Sb and the second hot melt wire Sc is above 450 twists / m and below 550 twists / m.

[0082] According to this configuration, the number of twists of the first hot-melt wire Sb and the second hot-melt wire Sc can be appropriately set. When the number of twists of the first hot-melt wire and the second hot-melt wire is less than 450 twists / m, the winding of the hot-melt wire becomes loose and easily unravels. If it exceeds 550 twists / m, the density of the hot-melt wire becomes too high, which easily increases the cost.

[0083] The diameter Z1 of the heat-fusion sewing thread S1 is more than 0.35 times and less than 0.9 times the length Z of the major axis 61a of the thread hole 61 of the sewing needle 6 through which the heat-fusion sewing thread S1 passes.

[0084] According to this configuration, the ratio of the diameter Z1 of the heat-fusion sewing thread S1 to the length Z of the major axis 61a of the thread hole 61 of the sewing needle 6 can be appropriately set. When the ratio of the diameter Z1 of the heat-fusion sewing thread S1 is less than 0.35 times, the thickness of the heat-fusion sewing thread S1 is insufficient, making it difficult to obtain the predetermined sewing strength. If the thickness Z1 of the heat-fusion sewing thread S1 exceeds 0.9 times, the temperature of the sewing needle 6 will rise due to the frictional heat generated between the thread hole 61 and the passing heat-fusion sewing thread S1, and sometimes the first heat-fusion thread Sb and the second heat-fusion thread Sc will melt.

[0085] The first hot melt connector Sb and the second hot melt connector Sc are polyamide-based fusion connectors.

[0086] According to this configuration, compared to cases using, for example, polyester-based or polypropylene-based resins, the rigidity is not excessive, and the feel is not easily impaired. Furthermore, according to this configuration, not only synthetic fibers but also natural fibers can be bonded, and the range of materials that can be bonded can be expanded.

[0087] The end fixing structure 1 includes: a first fabric 2 having a first end 21; a second fabric 3 having a second end 31; a serger line S1 that sews the first end 21 and the second end 31 together; a sewing part 4 that sews the first end 21 and the second end 31 together with a sewing thread S4; and an end bonding part 5 that folds the first end 21 and the second end 31 to the main body 20 of the first fabric 2 and / or the main body 30 of the second fabric 3 on one or both sides. In the end bonding part 5, the amount of adhesive 91 distributed in the serger line portion of the bonding part along the serger line S1 is greater than the amount of adhesive 92 distributed in other parts R.

[0088] According to the present invention, the first end 21 and the second end 31 can be fixed to the main body 30 using the adhesive 91 distributed on the overlock seam portion 51 of the adhesive portion. Compared with the adhesive 91 distributed on the overlock seam portion 51 of the adhesive portion, the amount of adhesive 92 distributed on other portions R is suppressed. Therefore, compared with the case where the end adhesive portion 5 is entirely provided with a hot melt adhesive or other tape component, excessive distribution of adhesive can be suppressed. As a result, the ends of the fabric can be fixed aesthetically while suppressing the hardening and weight increase of the fabric. Since the first end 21 and the second end 31 are overlocked, the end adhesive portion 5 can be provided continuously without interruption in the extension direction of the overlock seam S1, and the first end 21 and the second end 31 can be fixed to the main body 20, 30 more effectively.

[0089] The first end 21 and the second end 31 are integrally overlocked and sewn together with a lockstitch line S1. The lockstitch line S1 has a first back lockstitch line S11 located on the back side 2b of the first end 21 and a second back lockstitch line S12 located on the back side 3b of the second end 31. The lockstitch line portion 51 of the adhesive part is at least a portion that is provided with the second back lockstitch line S12 which is bent down on one side and is arranged opposite to the main body portion 30.

[0090] According to this configuration, since the first end 21 and the second end 31 are integrally bound with the overlock stitch S1, the process for fixing the ends can be simplified compared to the case where the first end 21 and the second end 31 are bound separately. By providing the adhesive overlock stitch portion 51 on only one side of the first back overlock stitch S11 and the second back overlock stitch S12 that is bent over on one side and arranged opposite to the main body portions 20 and 30, the first end 21 and the second end 31 can be fixed to the main body portions 20 and 30, and the increase of adhesive can be suppressed compared to the case where the adhesive overlock stitch portion is also provided on the other side.

[0091] In the manufacturing method of the end fixing structure 1, a first fabric 2 having a first end 21 and a second fabric 3 having a second end 31 are prepared. The first end 21 and the second end 31 are wrapped with a locking thread S1 including heat-fusion seams Sb and Sc. The first end 21 and the second end 31 are flat-stitched to form a seam 4. The first end 21 and the second end 31 are bent down on one side or both sides and bonded to the main body 20 and 30 of the first fabric 2 and / or the second fabric 3 to form an end bonding part 5.

[0092] According to the present invention, the first end 21 and the second end 31, which are sewn with overlock thread S1 including hot melt seams Sb and Sc, can be fixed to the main body portions 20 and 30. Compared with the case where hot melt adhesive or other tape components are arranged throughout the end bonding portion 5, excessive distribution of adhesive can be suppressed. As a result, the ends of the fabric can be fixed aesthetically while suppressing the hardening and weight increase of the fabric.

[0093] The first end 21 and the second end 31 are integrally sewn together by overlock stitching S1. The overlock stitching S1 has a first back overlock stitching S11 located on the back side 2b of the first end 21 and a second back overlock stitching S12 located on the back side 3b of the second end 31. The first back overlock stitching S11 or the second back overlock stitching S12, which is at least bent down on one side and is arranged opposite to the main body 20 and 30, has heat-fused seams Sb and Sc.

[0094] According to this configuration, since the first end 21 and the second end 31 are integrally overlocked with the overlock thread S1, the process for fixing the ends is simplified compared to the case where the first end 21 and the second end 31 are overlocked separately. Since one of the first back overlock thread S11 and the second back overlock thread S12, which are at least bent over on one side and positioned opposite the main body portions 20 and 30, includes heat-fused seams Sb and Sc, the first end 21 and the second end 31 can be fixed to the main body portions 20 and 30. Compared to the case where the other also includes heat-fused seams Sb and Sc, the increase in adhesive can be suppressed.

[0095] The spacing P1 of the overlock seam formed by the overlock line S1 is more than 0.5mm and less than 3.0mm.

[0096] According to this configuration, the spacing P1 of the overlock stitch can be appropriately set. When the spacing P1 is less than 0.5 mm, it is difficult to use a sewing machine or the like to move the sewing needle. If the spacing P1 exceeds 3.0 mm, the molten adhesive 91 distributed in the overlock stitch portion 51 along the overlock stitch S1 is prone to discontinuity, making it difficult to suppress the first end 21 and the second end from peeling off from the main body portions 20 and 30.

[0097] The sewing speed of the overlock thread S1 can be adjusted by the rotation speed of the sewing machine motor (not shown), which is set to 3000 rpm or higher and 8000 rpm or lower.

[0098] According to this configuration, the sewing speed can be set appropriately. When the sewing speed is less than 3000 rpm, the production efficiency decreases. If the sewing speed exceeds 8000 rpm, the temperature of the sewing needle 6 is easily increased due to the frictional heat between the sewing needle 6 and the fabric during sewing, and the heat-fused threads Sb and Sc may sometimes melt due to the increased temperature of the sewing needle 6.

[0099] In this embodiment, the structure of the first backlock edge line S11 and the second backlock edge line S12 including heat-fused threads Sb and Sc has been described, but it is not limited to this. For example, the second backlock edge line S12, which is unilaterally bent and arranged opposite to the back surface 3b of the main body 30 of the second fabric 3, may include heat-fused threads Sb and Sc, and the first backlock edge line S11 may be composed of conventional yarns such as staple fiber yarn and filament yarn, which do not include heat-fused threads Sb and Sc. Staple fiber yarn refers to textile yarn made by processing short fibers.

[0100] In this embodiment, the end bonding portion 5 is described as being formed by bending one side of the first end 21 and the second end 31 and then heat-fusing them to the back surface 3b of the second fabric 3. However, it is not limited to this. The end bonding portion 5 may also be formed by bending one side of the first end 21 and the second end 31 and then heat-fusing them to the back surface 2b of the first fabric 2.

[0101] In this embodiment, the overlock stitching of the first end 21 and the second end 31 is described as an edge-cutting overlock stitching performed by a single-needle three-thread overlock stitching machine. However, it is not limited to this; the first end 21 and the second end 31 can also be overlocked by a double-needle four-thread overlock stitching machine. In this case, since the needle thread S3, which is arranged along the direction extending from the end of the fabric and fixes the loop to the fabric, consists of two threads, therefore, as Figure 6 As shown by the double-dotted line, one of the two needles and threads can also be used to replace the plain stitch of suture thread S4.

[0102] In this embodiment, the structure of forming a seam 4 by sewing the first fabric 2 and the second fabric 3 together with a plain seam after the first end 21 and the second end 31 are covered is described, but it is not limited to this and the seam 4 (sewing line S4) may not be present.

[0103] In this embodiment, the structure in which the first end 21 and the second end 31 are integrally sewn together has been described, but it is not limited thereto. For example, as Figure 9 As shown, the first end 121 and the second end 131 can also be overlocked with overlock stitches S5 and S6 respectively, and are double-sided.

[0104] More specifically, it may also include: a first end 121 of the first fabric 102, which is overlocked with a first overlock thread S5; a second end 131 of the second fabric 103, which is overlocked with a second overlock thread S6; a seam 104, which is sewn together with a seam thread S7; and end bonding portions 105, 105, which are respectively bonded to the main body portion 120 of the first fabric 2 and the main body portion 130 of the second fabric 3.

[0105] The first overlock stitch S5 has a first back side stitch S51 located on the back side 102b of the first end 121 and a first front side stitch S52 located on the front side 102c. The second overlock stitch S6 has a second back side stitch S61 located on the back side 103b of the second end 131 and a second front side stitch S62 located on the front side 103c.

[0106] Although the illustration is omitted, it is related to Figure 7 and Figure 8 Similarly, the amount of adhesive 91 distributed in the bonding seam line portion 51 along the first seam line S5 and the second seam line S6 is greater than the amount of adhesive 92 distributed in other portions R. The bonding seam line portion 51 may also be at least a portion provided with the first back side line S51 and the second back side line S61 arranged opposite to the main body portions 120 and 130.

[0107] according to Figure 9The end fixing structure 101 shown achieves the following effect.

[0108] The overlock seam has a first overlock seam S5 that sews over the first end 121 and a second overlock seam S6 that sews over the second end 131. The first overlock seam S5 has a first back side line S51 located on the back side 102b side of the first end 121 and a first front side line S52 located on the front side 102c side. The second overlock seam S6 has a second back side line S61 located on the back side 103b side of the second end 131 and a second front side line S62 located on the front side 103c side. The end bonding portion 105 causes the first end 121 and the second end 131 to be bent over on both sides and bonded to the main body portions 120 and 130 respectively. The overlock seam portion 51 of the bonding portion is at least a portion that is provided with the first back side line S51 and the second back side line S61 arranged opposite to the main body portions 120 and 130.

[0109] According to this configuration, the first end 121 and the second end 131 can be bonded to the main body 120 and 130 respectively by using the adhesive 91 distributed on the locking line portion 51 of the adhesive portion.

[0110] The overlock seam has a first overlock seam S5 that covers the first end 121 and a second overlock seam S6 that covers the second end 131. The first overlock seam S5 has a first back side line S51 located on the back side 102b side of the first end 121 and a first front side line S52 located on the front side 102c side. The second overlock seam S6 has a second back side line S61 located on the back side 103b side of the second end 131 and a second front side line S62 located on the front side 103c side. In the end bonding portion 105, the first end 121 and the second end 131 are bent over on both sides and bonded to the main body portions 120 and 130 respectively. The first back side line S51 and the second back side line S61, which are arranged at least opposite to the main body portions 120 and 130, have heat-fused seams Sb and Sc.

[0111] According to this configuration, the first end 121 and the second end 131 can be bonded to the main body 120 and 130 using the heat-fusion lines Sb and Sc included in the first back side line S51 and the second back side line S61, which are arranged opposite to the main body portions 120 and 130, in the first overlock line S5 and the second overlock line S6, which are bent on both sides. Compared with the case where the first front side line S52 and the second front side line S62 also include heat-fusion lines Sb and Sc, the increase of adhesive can be suppressed.

[0112] This embodiment illustrates an example of overlock stitching performed by an overlock sewing machine, but other sewing methods such as straight stitching and cross stitching can also be applied. After sewing, subsequent heat pressing can solve problems such as thread unraveling. In the case of straight stitching, the motor speed is preferably 3000 rpm or more and 5000 rpm or less.

[0113] Furthermore, for example, when the heat-fusion sewing thread S1 is used as the seam thread for two pieces of waterproof fabric, the seam formed by sewing with the heat-fusion sewing thread S1 can be sealed by melting the first heat-fusion thread Sb and the second heat-fusion thread Sc after sewing, thereby using the first heat-fusion thread Sb and the second heat-fusion thread Sc, and then sewing with the baseline Sa. This prevents water from entering through the needle holes while suppressing peeling due to years of deterioration, as is the case when two pieces of waterproof fabric are bonded together using adhesives. Additionally, by providing an end-bonding portion that bonds the ends of the two pieces of fabric together using adhesive members, water can be prevented from entering between the two pieces of fabric.

[0114] The heat-fusion sewing thread S1 in this invention can be used for sewing two or more pieces of fabric in clothing, hats, bags, gloves, tents, tarpaulins, sleeping bags, sheets, umbrellas, etc., and can also be used for sewing quilted parts of down, bedding, etc. that have two or more pieces of fabric and filling.

[0115] It should be noted that the heat-fusion sewing thread S1 of the present invention is not limited to the configuration of the above embodiment and can be modified in various ways.

[0116] [Second Implementation] Next, the waterproof joint structure using heat-fused sewing thread will be explained. For example... Figure 10 As shown, the waterproof joint structure 1001 includes: an end bonding portion 1004 that bonds a first end 1021 of a first fabric 1002 and a second end 1031 of a second fabric 1003; and a sewing portion 1005 that sews the first end 1021 and the second end 1031 together. In this embodiment, the sewing portion 1005 sews the first end 1021 and the second end 1031 together using a plain stitch.

[0117] "Flat seam" refers to a sewing method, as described in JIS L0122, in which two or more pieces of fabric are overlapped face to face and sewn together from one side of the back. The seam 1005 overlaps the first fabric 1002 and the second fabric 1003 face to face and sewn together from one side of the back.

[0118] The first fabric 1002 and the second fabric 1003 are waterproof. The first fabric 1002 and the second fabric 1003 are, for example, made of woven fabric and / or knitted fabric. The first fabric 1002 and the second fabric 1003 can be made of fabrics with a water pressure resistance of 2000 mm or more.

[0119] like Figure 11 As shown, the first end 1021 is located at the end of the first fabric 1002 on at least one side in the width direction. The first end 1021 is overlocked with a first overlock thread S1001. In this embodiment, the overlocking of the first end 1021 is, for example, an edge overlocking performed by a single-needle three-thread overlock sewing machine. The plurality of first thread loops L1001 and L1002 constituting the overlock have a first positive thread loop L1001 located on the front (one side) 1002b of the first fabric 1002, and a first back thread loop L1002 located on the back (the other side) 1002c. The first positive thread loop L1001 and the first back thread loop L1002 extend continuously along the edge portion 1002a of the first fabric 1002.

[0120] The first overlock stitch S1001 has a first side stitch S1011 located on the front side 1002b of the first fabric 1002 and a first other side stitch S1012 located on the back side 1002c. The first side stitch S1011 forms a plurality of first positive stitch loops L1001 continuous along the length direction on the front side 1002b of the first fabric 1002. The first other side stitch S1012 forms a plurality of first back stitch loops L1002 continuous along the length direction on the back side 1002c of the first fabric 1002.

[0121] The spacing P1001 between each of the first thread loops L1001 and L1002 can be set to 0.5mm or more and 3.0mm or less; in this embodiment, it is set to 1.0mm or 2.0mm. The spacing P1001 between the first thread loops L1001 and L1002 is equivalent to the feed spacing of the overlock sewing machine, and is the distance in the length direction between adjacent first thread loops L1001 and L1002. When the spacing P1001 is 2.0mm, the number of stitches is 14 stitches / 3cm; when the spacing P1001 is 3.0mm, the number of stitches is 22 stitches / 3cm. Here, the number of stitches refers to the number of stitches within a 3cm interval.

[0122] The width W1001 of each first thread loop L1001 and L1002 can be set to 5mm or more and 8mm or less, for example, 6mm. The width W1 of each first thread loop L1001 and L1002 is equivalent to the swing width of the overlock sewing machine, which is the interval distance from the edge 1002a of the first fabric 1002 to the end L1011 and L1021 of each first thread loop L1001 and L1002 on the side away from the edge 1002a of the first fabric 1002.

[0123] Needle threads S1003 are disposed at the ends L1011 and L1021 of each first main thread loop L1001 and each first back thread loop L1002, respectively. The needle threads S1003 connect adjacent first main thread loops L1001 and adjacent first back thread loops L1002 to each other, thereby ensuring a continuous stitch in the length direction. In this embodiment, the needle threads S1003 include a right needle thread S1031 located on the edge portion 1002a side and a left needle thread S1032 located on the side away from the edge portion 1002a.

[0124] Using needle and thread S1003, a plurality of first thread loops L1001 and L1002 are secured to the first fabric 1002, preventing adjacent first thread loops L1001 from separating in the longitudinal direction. The plurality of first thread loops L1001 and L1002 are continuous in the longitudinal direction via needle and thread S1003 at their ends L1011 and L1021. A first side thread S1011 and a first other side thread S1012 intersect at the edge 1002a. A plurality of first positive thread loops L1001 and first back thread loops L1002 are continuous in the longitudinal direction at the edge 1002a.

[0125] Similar to the first end 1021, the second end 1031 is located at the end of the second fabric 1003 on at least one side in the width direction. The second end 1031 is overlocked with a second overlock stitch S1002. Since the second end 1031 has the same structure as the first end 1021, detailed description is omitted, and... Figure 11 The structure of the second end 1031 is marked with parentheses.

[0126] like Figure 11 As shown, the second end 1031 is overlocked with a second overlock stitch S1002. The plurality of second loops L1003 and L1004 constituting the overlock stitch have a second positive loop L1003 and a second back loop L1004 extending continuously along the edge portion 1003a of the second fabric 1003. The second overlock stitch S1002 has a second side line S1021 forming the second positive loop L1003 and a second other side line S1022 forming the second back loop L1004. The second overlock stitch S1002, like the first overlock stitch S1001, sets the swing width W1001 and spacing P1001 of the second loops L1003 and L1004.

[0127] exist Figure 12 The image shows a sewing process in which the first fabric 1002 and the second fabric 1003 are sewn together by a plain stitch after the first end 1021 and the second end 1031 have been overlocked. Figure 12 The diagram simply illustrates the overlock stitches (first overlock line S1001 and second overlock line S1002) at the first end 1021 and the second end 1031. Figure 12As shown, the first fabric 1002 and the second fabric 1003 are sewn together with a stitch line S1004 to form a seam 1005, with the front face 1002b of the first fabric 1002 and the front face 1003b of the second fabric 1003 facing each other and the edges 1002a and 1003a of the first fabric 1002 and the second fabric 1003 aligned with each other. The front face 1002b of the first fabric 1002 can be used as the first facing face, and the front face 1003b of the second fabric 1003 can be used as the second facing face. The back face 1002c of the first fabric 1002 can be used as the first opposing face, and the back face 1003c of the second fabric 1003 can be used as the second opposing face.

[0128] Figure 13 It shows Figure 12 The cross-section along line XIII-XIII in the stitching process. For example... Figure 13 As shown, a stitch line S1004 is provided in the seam section 1005. The stitch line S1004 includes a first stitch line S1041 located on the back side 1002c of the first fabric 1002 and a second stitch line S1042 located on the back side 1003c of the second fabric 1003.

[0129] The intersection S1040 of the first seam S1041 and the second seam S1042 is located at the center in the thickness direction of the overlapping first fabric 1002 and second fabric 1003. In other words, the intersection S1040 is located at the center in the thickness direction of the needle hole 1051 formed when the first fabric 1002 and the second fabric 1003 are sewn together. The position of the intersection S1040 is set according to the thread tension of the sewing machine.

[0130] Figure 14 This is an enlarged schematic diagram showing the first seam line S1001 unit. For example... Figure 14 As shown, in this embodiment, the first locking line S1001 is composed of a line including heat-fusion connectors Sb and Sc.

[0131] The first seam allowance S1001 is formed by spirally winding hot-melt bonding threads Sb and Sc, which contain hot-melt bonding components, around a baseline Sa, which does not contain hot-melt bonding components. In this embodiment, the baseline Sa is, for example, made of polyester double-twisted or triple-twisted filament yarn (filament yarn with a thickness of 75 dtex or more and 80 dtex or less, formed by triple-twisting filament yarn composed of 24 single threads), and the hot-melt bonding threads Sb and Sc can be polyamide-based bonding threads, for example, made of filament yarn with a thickness of 75 dtex or more and 80 dtex or less, formed by twisting 5 single threads. Filament yarn refers to yarn made by twisting multiple long fibers together. dtex (dectex) is a SI unit for expressing the thickness of filament yarn (long fiber), and the thickness of a thread with a length of 10,000 m and a weight of 1 g is called 1 dtex. The weight ratio of the hot melt wires Sb and Sc relative to the first locking wire S1001 can be set to be more than 25% and less than 50%, for example, 39%.

[0132] The melting temperature of the hot-melt connector Sb should be set between 100°C and 200°C, for example, 120°C or 130°C. Figure 14 The first overlock thread S1001 is described, but the second overlock thread S1002, needle thread S1003 and suture thread S1004 also have the same baseline Sa and heat fusion line Sb as the first overlock thread S1001.

[0133] like Figure 14 As shown, the fusion splices Sb and Sc have a lower fusion splice Sb covering the baseline Sa and an upper fusion splice Sc covering the lower fusion splice Sb. From the viewpoint of sewing feasibility, the twisting directions of the lower fusion splice Sb and the upper fusion splice Sc relative to the baseline Sa are preferably opposite. In this embodiment, the twisting direction of the lower fusion splice Sb relative to the baseline Sa is an S-twist (right twist). The twisting direction of the upper fusion splice Sc relative to the baseline Sa is a Z-twist (left twist). The twist count of the lower fusion splice Sb and the upper fusion splice Sc can be set to 450 twists / m or more and 550 twists / m or less; in this embodiment, the twist count is set to approximately 500 twists / m. The twist angle α of the lower fusion splice Sb can be set to 10 degrees or more and 30 degrees or less; in this embodiment, it is set to approximately 20 degrees. The twist angle β of the upper fusion splice wire can be set to 10 degrees or more and 30 degrees or less; in this embodiment, it is set to approximately 20 degrees. In this embodiment, each twisting angle α and β refers to the angle formed by the axis X1 of the baseline Sa and the lower hot-melt wire Sb or the upper hot-melt wire Sc.

[0134] Figure 15 This is a schematic cross-sectional view showing an enlarged view of the periphery of the thread hole 1061 of the sewing needle 1006 used to sew the first fabric 1002 and the second fabric 1003. (See image below.) Figure 15As shown, the thread hole 1061 of the sewing needle 1006 has a generally elliptical shape with a major axis 1061a and a minor axis 1061b. To reduce the diameter d of the needle holes in the first fabric 1002 and the second fabric 1003, the width d1 of the sewing needle 1006 is preferably small. On the other hand, the thread hole 1061 is preferably larger than the width d1 of the sewing needle 1006. For example, a No. 14 sewing machine needle manufactured by Organ Needle Co., Ltd. can be used, where the width d1 of the No. 14 needle is 0.8 mm relative to the width of the sewing needle 1006, the length of the major axis 1061a of the thread hole 1061 is set to 0.8 mm, and the length of the minor axis 1061b of the thread hole 1061 is set to 0.3 mm. In this embodiment, the width d1 of the sewing needle 1006 refers to the width of the portion where the minor axis 1061b is located in the longitudinal direction of the sewing needle 1006.

[0135] like Figure 15 As shown, the diameter Z1 of the first overlock stitch S1001, indicated by the double-dotted line, should be set to be at least 0.35 times and less than 0.9 times the length Z of the major axis 1061a of the thread hole 1061 of the sewing needle 1006, for example, 0.5 times. Figure 15 The text describes the sewing needle 1006 used for the first overlock thread S1001, but the sewing needles used for the second overlock thread S1002 and the seam thread S1004 also have the same structure as the sewing needle 1061 used for the first overlock thread S1001, so detailed descriptions are omitted.

[0136] Figure 16 Therefore, along Figure 10 The cross-section of the XVI-XVI line schematically shows the cross-sectional view of the end adhesive portion 1004 and the stitched portion 1005. (See diagram below.) Figure 16 As shown, the end bonding portion 1004 is formed in the following manner: after the first end 1021 and the second end 1031 are sewn together, while the second fabric 1003 is folded back to the side opposite to the direction of extension of the first fabric 1002, the first end 1021 and the second end 1031 are bent over on one side, so that the first end 1021 and the second end 1031 are heat-fused together, and the first end 1021 and the second end 1031 are heat-fused to the back side 1003c of the second fabric 1003 at a temperature of 100 degrees to 200 degrees.

[0137] In the end bonding portion 1004, the heat-fused seams Sb and Sc of the first overlock stitch S1001 and the second overlock stitch S1002 of the first end 1021 and the second end 1031 are melted by heat and then cooled, thus bonding the first end 1021 and the second end 1031 together. In the end bonding portion 1004, adhesive 1091 is distributed from the molten heat-fused seams Sb and Sc of the first overlock stitch S1001 and the second overlock stitch S1002. More specifically, as... Figure 17 As shown, the first end 1021 and the second end 1031 of the heat-fused seams Sb and Sc are sewn together by the baseline Sa of the first seam line S1001 and the second seam line S1002, and are bonded together using the heat-fused seams Sb and Sc. In this embodiment, the end bonding portion 1004 is the portion that bonds the first end 1021 and the second end 1031 using adhesive 1091 distributed in the bonding seam line portion 1041 along the first seam line S1001 and the second seam line S1002.

[0138] like Figure 11 and Figure 17 As shown, for example, the end-bonding portion 1004 is disposed between the edge portions 1002a and 1003a of the first fabric 1002 and the second fabric 1003 and the end portions L1011, L1021, L1031, and L1041 of the first loops L1001, L1002 and the second loops L1003, L1004. The width of the end-bonding portion 1004 is approximately the same as the width W1001 of the first loops L1001, L1002 and the second loops L1003, L1004. For example, when the ends are bonded using seam tape or the like, a substrate is disposed on the side of the seam tape opposite to the bonding surface at the end-bonding portion, but in this embodiment, the end-bonding portion 1004 is not provided with a substrate. As a result, it is possible to suppress the occurrence of situations where, as in the case of bonding the ends of clothing or the like using seam tape, the rigidity of the fabric is increased due to the use of a substrate, resulting in stiff clothing and impairing wearing comfort. In addition, when the ends of clothing or the like are glued together using seam tape, in order to prevent water from entering from the seam, the width of the end glued part needs to be set to be larger than the width W1001 of the thread loop. As a result, the area where the substrate is placed becomes wider, which makes it easier to further increase rigidity. However, since no substrate remains in the end glued part 1004, the width of the end glued part 1004 is approximately the same as the width W1001 of the thread loop, so it is easy to suppress the increase in rigidity.

[0139] Figure 17 This is an image of the bonding seam line portion 1051 and its surrounding area, taken using a scanning electron microscope (SEM) (Hitachi Advanced Technology Co., Ltd. Miniscope™ 3000). The SEM image was set to 30x magnification. Figure 17As shown, in the end bonding portion 1004, the amount of adhesive 1091 distributed in the bonding portion locking line portion 1041 along the first locking line S1001 and the second locking line S1002 (baseline Sa) is greater than the amount of adhesive 1092 distributed in other portions R. In this embodiment, the bonding portion locking line portion 1041 is the region including the portion 1041 where the first locking line S1001 and the second locking line S1002 are disposed and the surrounding 1042.

[0140] like Figure 18 As shown, the amount of adhesives 1091 and 1092 can be, for example, the thickness of adhesives 1091 and 1092 layered on the first fabric 1002 and the second fabric 1003. The thickness t1 of adhesive 1091 distributed in the overlock seam portion 1041 of the adhesive part is thicker than the thickness t2 of adhesive 1092 distributed in other portions R.

[0141] While the first end 1021 and the second end 1031 are heat-fused together, the heat-fusion joints Sb and Sc of the suture S4 also melt. If the heat-fusion joints Sb and Sc of the suture S1004 melt, then as Figure 13 As shown, the suture 1005 uses heat-fused threads Sb and Sc to close the needle hole 1051 formed during the flat sew, and uses the baseline Sa for sewing.

[0142] In this embodiment, the overlock thread portion 1041 and the seam thread portion 1052 of the adhesive part are sewn together using a sewing machine. The sewing speed of the overlock thread portion 1041 and the seam thread portion 1052 can be adjusted by the rotation speed of the sewing machine motor. The rotation speed of the sewing machine motor can be set to 3000 rpm or more and 8000 rpm or less, for example, 4000 rpm.

[0143] Next, the manufacturing method of the waterproof joint structure 1001 will be described.

[0144] like Figure 11 As shown, a first fabric 1002 and a second fabric 1003 with waterproof properties are prepared. The first end 1021, which is one end of the first fabric 1002 in the width direction, is overlocked with a first overlock thread S1001 including heat-sealing seams Sb and Sc. The second end 1031, which is one end of the second fabric 1003 in the width direction, is overlocked with a second overlock thread S1002 including heat-sealing seams Sb and Sc.

[0145] like Figure 12 As shown, the suture portion 1005 is formed by overlapping the first end 1021 and the second end 1031 face to face and by stitching with a suture S1004 including heat-fusion seams Sb and Sc. Figure 10 and Figure 16As shown, by applying heat to the first end 1021 and the second end 1031 while they are bent over on one side, they are thermally fused together. The first end 1021 and the second end 1031 are then bonded to the back surface 1002c of the first fabric 1002 or the back surface 1003c of the second fabric 1003. The pinhole 1051 is sealed with adhesive by melting the heat-fused threads Sb and Sc of the seam line S1004 of the seam 1005, thereby obtaining a waterproof joint structure 1001. For example, heating methods for applying heat to the first end 1021 and the second end 1031 can include hot pressing (heating, pressurizing, and cooling), ultrasonic heating (vibrating the first end 1021 and the second end 1031 using ultrasonic vibration and melting the heat-fused threads Sb and Sc using the frictional heat generated between the ends due to the vibration), and high-frequency heating (heating through molecular-level potential movement using high-frequency energy (electromagnetic waves)). These heating methods can be chosen by taking into account the fabric thickness, the number of overlapping pieces of the fabric (the distance from the fabric surface to the weld line), and production efficiency, or a combination of multiple heating methods can be used.

[0146] With the above configuration, the waterproof joint structure 1001 of this embodiment has the following effects.

[0147] The waterproof joint structure 1001 includes: a first fabric 1002 having a first end 1021; a second fabric 1003 having a second end 1031; an end bonding portion 1004 bonding the first end 1021 and the second end 1031; and a sewing portion 1005 sewing the first end 1021 and the second end 1031 together with a sewing thread, wherein the pinhole 1051 of the sewing thread 1004 is sealed with an adhesive.

[0148] According to the present invention, since the first end 1021 and the second end 1031 are bonded by the end bonding portion 1004, water can be prevented from penetrating from the front side 1002b of the first fabric 1002 and the front side 1003b of the second fabric 1003 through the space between the first fabric 1002 and the second fabric 1003 to the back side 1002c and 1003c. Since the first fabric 1002 and the second fabric 1003 are sewn together by the seam portion 1005, peeling due to deterioration over time can be suppressed in cases where the first fabric 1002 and the second fabric 1003 are bonded together with adhesive or the like. Since the pinhole 1051 of the seam S1004 is sealed by adhesive, water can be prevented from penetrating through the pinhole 1051. Since the amount of adhesive 1094 distributed in other parts R is suppressed compared with the adhesive distributed in the end bonding part 1004 and / or the sewing part 1005, it is possible to suppress excessive distribution of adhesive and suppress the increase in fabric weight.

[0149] Since the first fabric 1002 and the second fabric 1003 are sewn together by a flat seam, the end adhesive portion 1004 will not be exposed on the front side 1002b, 1003b, resulting in excellent aesthetics.

[0150] The first end 1021 and the second end 1031 are respectively wrapped with a first overlock stitch S1001 and a second overlock stitch S1002. The end bonding portion 1004 is a portion that bonds the first end 1021 and the second end 1031 together using adhesive 1091 distributed in the bonding portion overlock stitch portion 1041 along the first overlock stitch S1001 and the second overlock stitch S1002. In the end bonding portion 1004, the amount of adhesive 1091 distributed in the bonding portion overlock stitch portion 1041 is greater than the amount of adhesive 1092 distributed in other portions R.

[0151] According to this configuration, since the first end 1021 and the second end 1031 are bonded using adhesive 1091 distributed in the overlock seam portion 1041 of the adhesive section, water intrusion between the first end 1021 and the second end 1031 can be suppressed. Because the first end 1021 and the second end 1031 are overlocked, an end adhesive section 1004 can be provided that is continuously and uninterruptedly connected along the first overlock seam S1001 and the second overlock seam S1002, thus more effectively suppressing water intrusion between the first fabric 1002 and the second fabric 1003. Compared to adhesive 1091 distributed in the overlock seam portion 1041 of the adhesive section, the amount of adhesive 1092 distributed in other portions R is suppressed; therefore, compared to the case where hot melt adhesive or other tape components are integrally arranged in the end adhesive section 1004, excessive adhesive distribution can be suppressed. This allows for the aesthetically pleasing fixation of the fabric ends while preventing it from hardening and increasing in weight.

[0152] The first fabric 1002 and the second fabric 1003 respectively have a front (first opposing surface) 2b of the first fabric 1002 and a front (second opposing surface) 1003b of the second fabric 1003 facing each other. The first overlock line S1001 has a first side line S1011 located on the front 1002b of the first fabric 1002 and a first other side line S1012 located on the back (first opposing surface) 1002c. The second overlock line S1002 has a second side line S1021 located on the front 1003b of the second fabric 1003 and a second other side line S1022 located on the back (second opposing surface) 1003c. The overlock line portion 1041 of the adhesive part is at least the portion provided with the first side line S1011 and the second side line S1021.

[0153] According to this configuration, since the first end 1021 and the second end 1031 are bonded by adhesive 1091 distributed in the seam allowance portion 1041 along the first side line S1011 and the second side line S1021, water intrusion between the first fabric 1002 and the second fabric 1003 can be suppressed. The first side line S1011 and the second side line S1021 are disposed on the first opposing surface 1002b and the second opposing surface 1003b (surfaces facing each other) opposite to the front surfaces 1002b and 1003b of the first end 1021 and the second end 1031.

[0154] In the manufacturing method of the waterproof joint structure, the first end 1021 of the first fabric 1002 is wrapped with a first overlock thread S1001 including heat-fusion threads Sb and Sc, and the second end 1031 of the second fabric 1003 is wrapped with a second overlock thread S1002 including heat-fusion threads Sb and Sc. The first end 1021 and the second end 1031 are stitched together with a suture S1004 including heat-fusion threads Sb and Sc in an overlapping state to form a stitched portion 1005. The first overlock thread S1001 and the second overlock thread S1002 are melted, and the first end 1021 and the second end 1031 are heat-fused together to form an end bonding portion 1004. The suture S1004 of the stitched portion 1005 is melted to seal the needle hole 1051.

[0155] According to the present invention, since the first end 1021 and the second end 1031 are bonded together by the first overlock thread S1001 and the second overlock thread S1002 after being overlocked, forming an end bonding portion 1004, water can be prevented from penetrating the back side 1002c and 1003c from the front side 1002b and 1003b of the first fabric 1002 and the second fabric 1003 through the space between the first fabric 1002 and the second fabric 1003. Since the first fabric 1002 and the second fabric 1003 are sewn together by the seam portion 1005, peeling due to deterioration over time, as is the case when the first fabric 1002 and the second fabric 1003 are bonded together by adhesives or the like, can be suppressed. By melting the suture S1004, which includes heat-fusion seams Sb and Sc, the pinholes 1051 formed during sewing on the first fabric 1002 and the second fabric 1003 can be sealed with adhesive, thereby preventing water from entering through the pinholes 1051. Since the amount of adhesive 1094 distributed in other parts R is suppressed compared to the amount of adhesive distributed in the end adhesive portion 1004 and / or the sewing portion 1005, excessive distribution of adhesive can be suppressed, and the increase in fabric weight can be suppressed.

[0156] The first fabric 1002 and the second fabric 1003 have front faces (first opposing face, second opposing face) 1002b and 1003b respectively. The first overlock line S1001 has a first side line S1011 on the front face 1002b of the first fabric 1002 and a first other side line S1012 on the back face 1002c. The second overlock line S1002 has a second side line S10021 on the front face 1003b of the second fabric 1003 and a second other side line S1022 on the back face 1003c. At least the first side line S1011 and the second side line S1021 include heat-fused seams Sb and Sc.

[0157] According to this configuration, since the first end 1021 and the second end 1031 are bonded by the heat-fusion lines Sb and Sc included in the first side line S1011 and the second side line S1021 arranged opposite to the first opposite surface 1002b and the second opposite surface 1003b of the first fabric 1002 and the second fabric 1003, water intrusion between the first fabric 1002 and the second fabric 1003 can be suppressed.

[0158] The spacing P1001 of the overlock seam formed by the first overlock line S1001 and the second overlock line S1002 is more than 0.5mm and less than 3.0mm.

[0159] According to this configuration, the spacing P1001 of the overlock seam can be appropriately set. When the spacing P1001 is less than 0.5 mm, it is difficult to use a sewing machine or the like to move the sewing needle 1006. If the spacing P1001 exceeds 3.0 mm, the molten adhesive 1091 distributed in the adhesive overlock seam portion 1041 along the first overlock seam S1001 and / or the second overlock seam S1002 is prone to discontinuities, making it difficult to prevent water from penetrating between the first fabric 1002 and the second fabric 1003.

[0160] The first overlock line S1001, the second overlock line S1002, and the suture line S1004 are formed by spirally winding the heat-fusion lines Sb and Sc, which contain heat-fusion components, around the baseline Sa, which does not contain heat-fusion components.

[0161] According to this configuration, even when the heat-fused wires Sb and Sc have melted after heat fusion, baseline Sa remains in the end bonding portion 1004 and the sewn portion 1005. Therefore, it is possible to suppress detachment and peeling caused by years of deterioration, such as when the end bonding portion 1004 and the sewn portion 1005 are bonded with adhesive or the like.

[0162] The weight of the heat-fused threads Sb and Sc relative to the weight of the first overlock thread S1001, the second overlock thread S1002, and the suture thread S1004 is more than 25% and less than 50%.

[0163] According to this configuration, the ratio of heat-fused threads Sb and Sc included in the first overlock line S1001, the second overlock line S1002, and the seam line S1004 can be appropriately set. When the ratio of heat-fused threads Sb and Sc included in the first overlock line S1001 and / or the second overlock line S1002 is less than 25%, the amount of molten adhesive 1009 distributed in the adhesive overlock line portion 1041 along the first overlock line S1001 and / or the second overlock line S1002 is easily insufficient, resulting in insufficient adhesive strength or adhesive area, making it difficult to prevent water from penetrating between the first fabric 1002 and the second fabric 1003.

[0164] When the proportion of heat-fused threads Sb and Sc included in the suture S1004 is less than 25%, the amount of adhesive 1009 is easily insufficient, and the needle holes 1051 formed in the first fabric 1002 and the second fabric 1003 cannot be sealed during sewing, making it difficult to prevent water from entering from the needle holes 1051.

[0165] When the thickness of the first overlock thread S1001, the second overlock thread S1002, and / or the suture thread S1004 is set to a predetermined thickness for passing through the thread hole 1061 of the sewing needle of a sewing machine or the like, if the proportion of the heat-fused threads Sb and Sc included in the first overlock thread S1001, the second overlock thread S1002, and / or the suture thread S1004 exceeds 50%, the thickness of the baseline Sa becomes thinner and the stitch strength easily weakens.

[0166] Conversely, when the thickness of the baseline Sa is kept constant, the thickness of the first overlock thread S1001, the second overlock thread S1002, and / or the sewing thread S1004 becomes thicker, and the thread hole 1061 through which the first overlock thread S1001, the second overlock thread S1002, and / or the sewing thread S1004 pass becomes larger. As a result, as the thread hole 1061 enlarges, the thickness of the sewing needle 1006 increases. Therefore, the needle hole 1051 formed in the first fabric 1002 and the second fabric 1003 during sewing becomes larger, making it difficult to seal the needle hole 1051 with the adhesive 1093, and thus, it is sometimes difficult to prevent water from entering from the needle hole 1051.

[0167] The melting temperature of Sb and Sc in the hot-melt wire is above 100 degrees and below 200 degrees.

[0168] According to this configuration, the melting temperature of the heat-fused threads Sb and Sc can be appropriately set. When the melting temperature is below 100 degrees Celsius, the heat-fused threads Sb and Sc may sometimes melt due to the increased temperature of the sewing needle 1006 caused by frictional heat between the sewing needle 1006 and the fabric during sewing. Additionally, melting may occur due to ironing, roller drying, etc., leading to a decrease in adhesive properties. If the melting temperature exceeds 200 degrees Celsius, colorfastness typically decreases, the fabric is prone to discoloration, and sometimes the fabric itself may dissolve.

[0169] The suture S1004 has a first suture S1041 located on the back surface 1002c of the first end 1021 and a second suture S1042 located on the back surface 1002c of the second end 1031. The intersection S1040 of the first suture S1041 and the second suture S1042 is set to be located at the center in the thickness direction of the overlapping first fabric 1002 and second fabric 1003.

[0170] According to this configuration, compared to the case where the intersection S1040 of the first seam S1041 and the second seam S1042 is biased towards the first fabric 1002 or the second fabric 1003, it is easier to uniformly seal the pinholes 1051 provided on the first fabric 1002 and the second fabric 1003 using the adhesive 1093. For example, when the intersection S1040 is biased to one side, the adhesive may sometimes leak to the outside of the pinhole 1051 on one side, while the adhesive 1093 on the other side is insufficient, making it difficult to fully seal the pinhole 1051 and achieve a waterproof effect.

[0171] The diameter Z1 of the first overlock thread S1001, the second overlock thread S1002, and / or the suture thread S1004 is more than 0.35 times and less than 0.9 times the length Z of the major axis 1061a of the thread hole 1061 of the sewing needle 1006.

[0172] According to this configuration, the ratio of the diameter Z1 of the first overlock thread S1001, the second overlock thread S1002, and / or the sewing thread S1004 to the length Z of the major axis 1061a of the thread hole 1061 of the sewing needle 1006 can be appropriately set. When the ratio of diameter Z1 is less than 0.35, the thickness of the first overlock thread S1001, the second overlock thread S1002, and / or the sewing thread S1004 is insufficient, making it difficult to obtain the predetermined sewing strength. If the ratio of diameter Z1 to the major axis 1061a exceeds 0.9, the temperature of the sewing needle 1006 increases due to the frictional heat generated between the thread hole 1061 and the thread passing through it, and sometimes the heat-fused threads Sb and Sc may melt. When the thickness and diameter Z1 of the sewing needle 1006 are set constant, when the ratio of diameter Z1 is less than 0.35, the thread hole 1061 becomes relatively larger, and the strength of the sewing needle 1006 decreases. If the diameter Z1 remains constant while maintaining the strength of the sewing needle 1006, and the ratio of the diameter Z1 exceeds 0.9 times, the thickness of the sewing needle 1006 will increase, and the needle hole 1051 formed in the first fabric 1002 or the second fabric 1003 will become larger. Depending on the amount of adhesive 1093, it will be difficult to seal the needle hole 1051, and therefore, it will be difficult to prevent water from entering through the needle hole 1051.

[0173] The sewing speeds of the first overlock thread S1001, the second overlock thread S1002, and the seam thread S1004 can be adjusted by the rotation speed of the sewing machine motor (not shown), which is set to be above 3000 rpm and below 8000 rpm.

[0174] According to this configuration, the sewing speed can be set appropriately. When the sewing speed is less than 3000 rpm, the production efficiency decreases. If the sewing speed exceeds 8000 rpm, the temperature of the sewing needle 1006 is easily increased due to the frictional heat between the sewing needle 1006 and the fabric during sewing, and the heat-fused threads Sb and Sc may sometimes melt due to the increased temperature of the sewing needle 1006.

[0175] In this embodiment, an example has been described where the end bonding portion 1004 is composed of an adhesive 1009 distributed in the bonding portion locking line portion 1041 along the first locking line S1001 and the second locking line S1002, which bonds the first end 1021 and the second end 1031 together. However, as... Figure 19As shown in the first variation, the end bonding portion 1104 can be, for example, an adhesive portion bonded using an adhesive component such as hot melt adhesive H1 disposed between the first end 1121 and the second end 1131. In this case, the first overlock line S1101 and the second overlock line S1102 can also be formed only by the baseline Sa. According to this configuration, the first end 1121 and the second end 1131 can be bonded using the adhesive portion 1104, thus preventing water from penetrating between the first fabric 1102 and the second fabric 1103. In addition, similarly to the above embodiment, since the first end 1121 and the second end 1131 are sewn together with a stitch S1104 including hot melt seams Sb and Sc, water can also be prevented from penetrating through the thread hole of the sewn portion 1105. Furthermore, by applying hot melt adhesive H2 to the back side 1103c of the second end 1131, it is possible to bond the first end 1121 and the second end 1131 to the back side 1103c of the second fabric 1103 when one side is bent down. In this embodiment, the hot melt adhesives H1 and H2 are made of thermoplastic resin or the like.

[0176] Alternatively, it can be like Figure 20 As shown in the second variation, the first end 1221 and the second end 1231 are bonded together by the adhesive member H1, and the first end 1221 and the second end 1231 are overlocked with the first overlock thread S1201 while the two ends 1221 and 1231 overlap each other. In other words, the first end 1221 and the second end 1231 may not be overlocked separately, or the first end 1221 and the second end 1231 may be overlocked integrally with the first overlock thread S1201. The first overlock thread S1201 is formed by a first side line S1211 of the first overlock thread S1201 located on the back side 1203c of the second end 1231 by at least a line including heat-sealing threads Sb and Sc, thereby enabling the first end 1221 and the second end 1231 to be bonded to the back side 1203c of the second fabric 1203 when one side is bent over. In this case, the first other side line S1212 of the first locking line S1201 can be composed of lines excluding fusion lines Sb and Sc.

[0177] In this embodiment, the overlock stitching of the first end 1021 and the second end 1031 is described as an edge-cutting overlock stitching performed by a single-needle three-thread overlock stitching machine. However, it is not limited to this; the first end 1021 and the second end 1031 can also be overlocked by a double-needle four-thread overlock stitching machine. In this case, since the needle thread S1003, which is arranged along the direction extending from the end of the fabric and fixes the loop to the fabric, consists of two threads, therefore, as Figure 20 As shown by the double-dotted line, one of the two needles and threads can also be used to replace the plain stitch of the S1004 suture.

[0178] In this embodiment, an example has been described where the end bonding portion 1004 is formed by bonding the first end 1021 and the second end 1031 using adhesive 1009 distributed in the bonding portion locking line portion 1041 along the first locking line S1001 and the second locking line S1002. However, as... Figure 21 As shown in the third variation, the end bonding portion 1304 can also be constructed as an ultrasonic welding portion where the first end 1321 and the second end 1331 are joined by melting the first fabric 1302 and the second fabric 1003 without using an adhesive. According to this configuration, the first end 1321 and the second end 1331 can be bonded together by the ultrasonic bonding portion 1304, thus preventing water from penetrating between the first fabric 1302 and the second fabric 1003. Furthermore, similar to the above embodiment, since the first end 1321 and the second end 1331 are sewn together with a stitch S1304 including heat-fusion threads Sb and Sc, water can also be prevented from penetrating through the thread holes of the stitch portion 1105. Moreover, by providing hot melt adhesive H3 on the back side 1303c of the second end 1331, it is possible to bond the first end 1321 and the second end 1331 to the back side 1303c of the second fabric 1003 when one side is bent over. The first end 1321 and the second end 1331 can also be ultrasonically bonded to the back surface 1303c of the second fabric 1003 without using hot melt adhesive H3.

[0179] In the manufacturing method of the waterproof joint structure 1301, a first fabric 1302 having a first end 1321 and a second fabric 1003 having a second end 1331 are prepared. The first end 1321 and the second end 1331 are ultrasonically bonded in an overlapping state to form an end bonding portion 1304. The first end 1321 and the second end 1331 are sewn together with a sewing thread S4 including a heat-fusion thread Sb to form a sewing portion 1305. The sewing thread S1004 of the sewing portion 1305 is melted to close the thread hole 1351.

[0180] In this embodiment, the structure of the first side line S1011, the first other side line S1012, the second side line S1021, the second other side line S1022, the first suture S1041 and the second suture S1042 including heat-fused connectors Sb and Sc has been described, but it is not limited thereto. For example, the first side line S1011 and the second side line S1021, the first suture S1041 and the second suture S1042, which are arranged opposite to each other at the first end 1021 and the second end 1031, may also include heat-fused connectors Sb and Sc.

[0181] In this embodiment, the first fabric 1002 and the second fabric 1003 are described as being sewn together by a plain stitch, but this is not the only possibility. The first fabric 1402 and the second fabric 1403 can also be sewn together as follows: Figure 22 As shown in the fourth variation, the first end 1421 and the second end 1431 are bound together by the first overlock stitch S1401 and the second overlock stitch S1402. The first fabric 1402 and the second fabric 1403 can also be sewn together such that the back side 1403c of the second end 1431 overlaps with the front side 1402b of the first end 1421, and then sewn together with the seam thread S1404. In this case, the first overlock stitch S1401, the second overlock stitch S1402, and the seam thread S1404 can also be configured to include heat-sealed seams Sb and Sc.

[0182] Alternatively, it can be like Figure 23 As shown in the fifth variation, the first end 1521 and the second end 1531 are bonded together by an adhesive component such as hot melt adhesive H5 disposed between the first end 1521 and the second end 1531. In this case, the stitch line S1504 may be configured to include hot melt threads Sb and Sc, and the first overlock line S1501 and the second overlock line S1502 may be configured by a baseline Sa without including hot melt threads Sb and Sc.

[0183] The waterproof joint structure 1001 in this invention can be applied to the sewing of two or more pieces of fabric that require waterproofing, such as clothing, hats, bags, gloves, tents, tarpaulins, sleeping bags, sheets, and umbrellas.

[0184] When the waterproof joint structure 1001 is applied to clothing such as raincoats, for example, the waterproof joint structure 1001 is preferably configured to avoid areas that are easily exposed to rain when worn, such as the top of the shoulders or the collar. Furthermore, the waterproof joint structure 1001 is preferably configured to avoid areas where pressure is applied, such as the elbows, knees, and hips.

[0185] When the first end 1021 and the second end 1031 are bent over on one side, such as Figure 16 As shown, preferably the first end 1021 and the second end 1031 are tilted in the opposite direction to the direction of water intrusion indicated by arrow A.

[0186] The waterproof bonding structure 1001 of this invention was applied to clothing, and waterproof tests were conducted. The result was that no water leakage was observed under assumed wearing scenarios (e.g., the ability to use the clothing without getting wet during activities such as golfing, running, watching sports, and outdoor work in the rain). In the waterproof test, a mannequin or test subject wore clothing equipped with the waterproof bonding structure 1001 of this invention. An artificial rainfall test device was adjusted to a rainfall rate of 30 mm / h. After 30 minutes of rainfall, visual inspection was conducted to determine whether water had entered the mannequin or test subject.

[0187] Addressing the issues that traditional windbreakers cannot withstand rain, and that hardshell raincoats for outdoor use have adhesive tape-like joints that are rigid and expensive, the present invention's waterproof joint structure 1001 offers flexibility in fabric selection and simplifies sewing, thus enabling it to target this niche market.

[0188] Furthermore, the waterproof joint structure 1001 of the present invention is not limited to the configuration of the above embodiment and can be modified in various ways.

[0189] [Third Implementation Method] Next, the end fixing structure using heat-fusion sewing thread will be explained. Figure 24 The image shows a top view of two pieces of fabric (first fabric 2002, second fabric 2003) equipped with an end-fixing structure 2001 for a heat-fusion sewing thread according to an embodiment of the present invention. Figure 24 As shown, the end fixing structure 2001 of the present invention includes: a first fabric 2002 having a first end 2021; a second fabric 2003 having a second end 2031; a seam allowance S2001 for overlocking the first end 2021 and the second end 2031; a sewing portion 2004 for sewing the first end 2021 and the second end 2031 together; and an end bonding portion 2005 for bonding the first end 2021 and the second end 2031 to the main body portion 2030 of the second fabric 2003 by bending one side down. In this embodiment, the sewing portion 2004 sews the first fabric 2002 and the second fabric 2003 together by a flat stitch.

[0190] "Flat stitch" refers to a sewing method, as described in JIS L0122, in which two or more pieces of fabric are overlapped face to face and sewn together from the back side. In other words, the seam 2004 overlaps the first fabric 2002 and the second fabric 2003 face to face and sewn together from the back side.

[0191] The first fabric 2002 and the second fabric 2003 are, for example, made of woven and / or knitted fabrics. The first fabric 2002 and the second fabric 2003 are, for example, made of 100% polyester, a synthetic fiber. It should be noted that this heat-fused-to-weld thread can bond not only synthetic fibers but also natural fibers.

[0192] like Figure 25As shown, the first end 2021 is located on one side of the width direction of the first fabric 2002. The second end 2031 is located on one side of the width direction of the second fabric 2003. The first end 2021 and the second end 2031 are overlocked with overlock thread S2001. In this embodiment, the first end 2021 and the second end 2031 are integrally overlocked with overlock thread S2001.

[0193] The overlock stitches at the first end 2021 and the second end 2031 are, for example, edge-cut overlock stitches performed using a single-needle three-thread overlock sewing machine. The plurality of loops L2001 and L2002 constituting the overlock stitches include a first loop L2001 located on the back surface 2002b of the first fabric 2002 and a second loop L2002 located on the back surface 2003b of the second fabric 2003. The plurality of first loops L2001 and second loops L2002 extend adjacently and continuously along the edges 2200a and 2003a of the first fabric 2002 and the second fabric 2003.

[0194] The overlock stitch S2001 has a first back overlock stitch S2011 located on the back side 2002b of the first fabric 2002, and a second back overlock stitch S2012 located on the back side 2003b of the second fabric. The first back overlock stitch S2011 forms a plurality of first loops L2001 continuous along the length direction on the back side 2002b of the first fabric 2002. The second back overlock stitch S2012 forms a plurality of second loops L2002 continuous along the length direction on the back side 2003b of the second fabric 2003.

[0195] The distance P2001 between each first thread loop L2001 and each second thread loop L2002 can be set to 0.5mm or more and 3.0mm or less; in this embodiment, it is set to 1.0mm or 2.0mm. The distance P2001 between the first thread loop L2001 and each second thread loop L2002 is equivalent to the feed spacing of the overlock sewing machine, and is the lengthwise distance between adjacent first thread loops L2001 and second thread loops L2002. When the distance P2001 is 2.0mm, the stitch count is 14 stitches / 3cm; when the distance P2001 is 3.0mm, the stitch count is 22 stitches / 3cm. Here, the stitch count refers to the number of stitches within a 3cm interval.

[0196] The width W1 of each first thread loop L2001 and each second thread loop L2002 can be set to 5mm or more and 8mm or less, for example, 6mm. The width W2001 of each first thread loop L2001 and each second thread loop L2002 is equivalent to the swing width of the overlock sewing machine, and is the interval distance from the edge portions 2002a and 2003a of the first fabric 2002 and the second fabric 2003 to the end portions L2011 and L2021 of each first thread loop L2001 and the second thread loop L2002 on the side away from the edge portions 2002a and 2003a.

[0197] A needle thread S2003 is disposed at the ends L2011 and L2021 of each first thread loop L2001 and each second thread loop L2002. The needle thread S2003 connects adjacent first thread loops L2001 and adjacent second thread loops L2002 to each other, thereby making the stitch continuous in the length direction. In this embodiment, the needle thread S2003 includes a right needle thread S2031 located on the edge portion 2002a and 2003a side and a left needle thread S2032 located on the side away from the edge portion 2002a and 2003a.

[0198] Using needle and thread S2003, a plurality of first loops L2001 and second loops L2002 are secured to the first fabric 2002 and the second fabric 2003, preventing adjacent first loops L2001 from separating in the longitudinal direction. The plurality of first loops L2001 and second loops L2002 are continuous in the longitudinal direction at their ends L2011 and L2021 via needle and thread S2003. The first backlock stitch S2011 and the second backlock stitch S2012 intersect at the edge 2002a. The plurality of first loops L2001 and second loops L2002 are continuous in the longitudinal direction at the edge 2002a.

[0199] exist Figure 26 The image shows a sewing process in which the first fabric 2002 and the second fabric 2003 are sewn together by a plain stitch after the first end 2021 and the second end 2031 have been overlocked. Figure 26 For ease of explanation, the first end 2021 and the second end are shown offset, and the overlock stitch (overlock line S2001) of the first end 2021 and the second end 2031 is simply shown. Figure 26 As shown, the first fabric 2002 and the second fabric 2003 are sewn together with the front faces 2002c of the first fabric 2002 and the front faces 2003c of the second fabric 2003 facing each other and the edges 2002a and 2003a of the first fabric 2002 and the second fabric 2003 aligned with each other. This forms the sewn portion 2004.

[0200] Figure 27This is an enlarged schematic diagram showing the S2001 seam stitching unit. For example... Figure 27 As shown, in this embodiment, the locking line S2001 is composed of a wire including heat-fusion connectors Sb and Sc.

[0201] The overlock thread S2001 is constructed by spirally winding the heat-fusion bonding threads Sb and Sc, which contain heat-fusion bonding components, around the baseline Sa, which does not contain heat-fusion bonding components. In this embodiment, the baseline Sa is, for example, composed of polyester double-twisted or triple-twisted filament yarn (filament yarn with a thickness of 75 dtex or more and 80 dtex or less, formed by triple-twisting filament yarn composed of 24 single strands). The heat-fusion bonding threads Sb and Sc can be any polyamide-based bonding threads, for example, composed of filament yarn with a thickness of 75 dtex or more and 80 dtex or less, formed by twisting 5 single strands. Filament yarn refers to yarn made by twisting multiple long fibers together. dtex (dectex) is a SI unit for expressing the thickness of filament yarn (long fiber). The thickness of a thread with a length of 10,000 m and a weight of 1 g is called 1 dtex. The weight ratio of the heat-fusion wires Sb and Sc relative to the edge-locking wire S2001 should be set to more than 25% and less than 50%, for example, 39%.

[0202] The melting temperature of the hot-melt wires Sb and Sc can be set to above 100 degrees and below 200 degrees, for example, 120 degrees or 130 degrees.

[0203] like Figure 27 As shown, the fusion splices Sb and Sc have a lower fusion splice Sb covering the baseline Sa and an upper fusion splice Sc covering the lower fusion splice Sb. From the viewpoint of sewing feasibility, the twisting directions of the lower fusion splice Sb and the upper fusion splice Sc relative to the baseline Sa are preferably opposite. In this embodiment, the twisting direction of the lower fusion splice Sb relative to the baseline Sa is an S-twist (right twist). The twisting direction of the upper fusion splice Sc relative to the baseline Sa is a Z-twist (left twist). The twist count of the lower fusion splice Sb and the upper fusion splice Sc can be set to 450 twists / m or more and 550 twists / m or less; in this embodiment, the twist count is set to approximately 500 twists / m. The twist angle α of the lower fusion splice Sb can be set to 10 degrees or more and 30 degrees or less; in this embodiment, it is set to approximately 20 degrees. The twist angle β of the upper fusion splice wire can be set to 10 degrees or more and 30 degrees or less; in this embodiment, it is set to approximately 20 degrees. In this embodiment, each twisting angle α and β refers to the angle formed by the axis X1 of the baseline Sa and the lower hot-melt wire Sb or the upper hot-melt wire Sc.

[0204] Figure 28 This is a schematic cross-sectional view showing an enlarged view of the periphery of the thread hole 2061 of the sewing needle 2006 used to sew the first fabric 2002 and the second fabric 2003. (See image below.) Figure 28 As shown, the thread hole 2061 of the sewing needle 2006 has a generally elliptical shape with a major axis 2061a and a minor axis 2061b. To reduce the diameter d of the needle holes in the first fabric 2002 and the second fabric 2003, the width d1 of the sewing needle 2006 is preferably small. On the other hand, the thread hole 2061 is preferably larger than the width d1 of the sewing needle 2006. For example, a No. 14 sewing machine needle manufactured by Organ Needle Co., Ltd. can be used, which has a width d1 of 0.8 mm relative to the sewing needle 2006, a length of the major axis 2061a of the thread hole 2061 set to approximately 0.8 mm, and a length of the minor axis 2061b of the thread hole 2061 set to approximately 0.3 mm. In this embodiment, the width d1 of the sewing needle 2006 refers to the width of the portion where the minor axis 2061b is located in the longitudinal direction of the sewing needle 2006.

[0205] like Figure 28 As shown, the diameter Z1 of the first overlock line S2001 indicated by the double-dotted line can be set to be more than 0.35 times and less than 0.9 times the length Z of the major axis 2061a of the thread hole 2061 of the sewing needle 2006, for example, it can be set to 0.5 times.

[0206] Figure 29 Therefore, along Figure 24 The cross-section of the XXIX-XXIX line schematically shows a cross-sectional view of the suture portion 2004 and the end adhesive portion 2005. (See diagram below.) Figure 29 As shown, the end bonding portion 2005 is formed in the following manner: after the first end 2021 and the second end 2031 are sewn together, while the second fabric 2003 is folded back to the side opposite to the direction of extension of the first fabric 2002, the first end 2021 and the second end 2031 are bent over on one side and heat-fused to the back side 2003b of the second fabric 2003 at a temperature of 100 to 200 degrees.

[0207] In the end bonding portion 2005, the heat-fused threads Sb and Sc of the locking edge wire S2001 melt due to heat and are then cooled, bonding the first end 2021 and the second end 2031 to the main body portion 2030. In the end bonding portion 2005, adhesive 2091 is distributed after the heat-fused threads Sb and Sc of the locking edge wire S2001 have melted. More specifically, as... Figure 30As shown, the first end 2021 and the second end 2031 of the heat-fused seams Sb and Sc are sewn together by the baseline Sa of the overlock stitch S2001, and are bonded together using the heat-fused seams Sb and Sc. In this embodiment, the end bonding portion 2005 is a portion of the first end 2021 and the second end 2031 bonded to the main body portion 2030 of the second fabric 2003 by using adhesive 2091 distributed in the bonding portion overlock stitch portion 2051 along the overlock stitch S2001.

[0208] like Figure 25 and Figure 30 As shown, for example, the end-bonding portion 2005 is disposed between the edge portions 2002a and 2003a of the first fabric 2002 and the second fabric 2003 and the end portions L2011 and L2021 of the first loop L2001 and the second loop L2002. The width of the end-bonding portion 2005 is approximately the same as the width W2001 of the first loop L2001 or the second loop L2002. For example, when the ends are bonded using a seam tape or the like, a substrate is disposed on the side of the seam tape opposite to the bonding surface at the end-bonding portion, but in this embodiment, the end-bonding portion 2005 does not have a substrate disposed thereon.

[0209] Figure 30 This is an image of the bonding seam line portion 2051 and its surrounding area, taken using a scanning electron microscope (Hitachi Advanced Technology Co., Ltd. Miniscope™ 3000). The SEM image was set to 30x magnification. Figure 30 As shown, in the end bonding portion 2005, the amount of first adhesive 2091 distributed in the bonding portion locking line portion 2051 along the locking line S2001 (baseline Sa) is greater than the amount of second adhesive 2092 distributed in other portions R. In this embodiment, the bonding portion locking line portion 2051 is the region including the portion 2051 where the locking line S2001 is disposed and the surrounding 2052.

[0210] like Figure 31 As shown, the amount of adhesive 2091 can be, for example, the thickness of adhesive 2091 layered on the first fabric 2002 and the second fabric 2003. The thickness t1 of adhesive 2091 distributed in the overlock seam portion 2051 of the adhesive part is thicker than the thickness t2 of adhesive 2092 distributed in other portions R.

[0211] In this embodiment, the overlock thread portion 2051 of the adhesive part is sewn using a sewing machine. The sewing speed of the overlock thread portion 2051 of the adhesive part can be adjusted by the rotation speed of the sewing machine motor. The rotation speed of the sewing machine motor can be set to 5000 rpm or more and 8000 rpm or less, for example, 4000 rpm.

[0212] Next, the manufacturing method of the end fixing structure 2001 of the two sewn fabric pieces 2002 and 2003 will be explained.

[0213] like Figure 25 As shown, prepare a first fabric 2002 and a second fabric 2003. Overlap the first fabric 2002 and the second fabric 2003 with their right sides facing each other. Sew the first end 2021, which is one end of the first fabric 2002 in the width direction, and the second end 2031, which is one end of the second fabric 2003 in the width direction, together with an overlock thread S2001 including heat-sealing seams Sb and Sc.

[0214] like Figure 26 As shown, the seam portion 2004 is formed by flat stitching the first end 2021 and the second end 2031 with suture S2004. Figure 25 and Figure 30 As shown, with the first end 2021 and the second end 2031 bent over on one side, the first end 2021 and the second end 2031 are bonded to the back surface 2003b of the main body 2030 of the second fabric 2003, forming an end bonding portion 2005, thereby obtaining the end fixing structure 2001 of the two sewn fabric pieces 2002 and 2003. As for the heating method for applying heat to the first end 2021 and the second end 2031, for example, hot pressing (heating, pressurizing, and cooling), ultrasonic heating (using ultrasonic vibration to vibrate the first end 2021 and the second end 2031 and using the frictional heat generated between the ends due to vibration to melt the heat-fused seams Sb and Sc for bonding), and high-frequency heating (using high-frequency energy (electromagnetic waves) to heat through molecular-level potential movement), etc. These heating methods can be appropriately selected considering the fabric thickness, the number of overlapping pieces of the fabric (distance from the fabric surface to the weld line), and production efficiency, or multiple heating methods can be combined.

[0215] With the above configuration, the end fixing structure 2001 of this embodiment has the following effects.

[0216] The end fixing structure 2001 includes: a first fabric 2002 having a first end 2021; a second fabric 2003 having a second end 2031; a serger line S2001 that sews the first end 2021 and the second end 2031 together; a sewing portion 2004 that flat-sews the first end 2021 and the second end 2031 together with a sewing line S2004; and an end bonding portion 2005 that bonds the first end 2021 and the second end 2031 to the main body portion 2020 of the first fabric 2002 and / or the main body portion 2030 of the second fabric 2003 by bending down one side or both sides. In the end bonding portion 2005, the amount of adhesive 2091 distributed in the serger line portion 2051 of the bonding portion along the serger line S2001 is greater than the amount of adhesive 2092 distributed in other portions R.

[0217] According to the present invention, the first end 2021 and the second end 2031 can be fixed to the main body 2030 using the adhesive 2091 distributed on the overlock seam portion 2051 of the adhesive portion. Compared with the adhesive 2091 distributed on the overlock seam portion 2051 of the adhesive portion, the amount of adhesive 2092 distributed on other portions R is suppressed. Therefore, compared with the case where hot melt adhesive or other tape components are arranged as a whole on the end adhesive portion 2005, excessive distribution of adhesive can be suppressed. As a result, the ends of the fabric can be fixed aesthetically while suppressing the hardening of the fabric and the increase in weight. Since the first end 2021 and the second end 2031 are overlocked, the end adhesive portion 2005, which is continuously and uninterruptedly provided in the extension direction of the overlock seam S2001, can more effectively fix the first end 2021 and the second end 2031 to the main body 2020 and 2030.

[0218] In addition, such as Figure 32 As shown in (a), when the first end 2021 and the second end 2031 are sewn together but not bonded to the main body 2030 (without end bonding portion 2005), the seam allowance 2041 formed on the sewn portion 2004 where the first end 2021 and the second end 2031 are sewn together will stand up, easily causing a dent in the seam allowance 2041 on the front side of the fabric, which easily damages the appearance. In contrast, according to the present invention, as Figure 32 As shown in (b), since the end bonding portion 2005 is provided to bond the first end 2021 and the second end 2031 to the main body portion 2030, the standing up of the seam allowance portion 2041 is suppressed, the seam allowance portion 2041 on the front side of the fabric is less likely to be dented, it is easy to maintain a flat state, and it is less likely to damage the appearance.

[0219] The first end 2021 and the second end 2031 are integrally sewn together by overlock stitch S2001. The overlock stitch S2001 has a first back overlock stitch S2011 located on the back side 2002b of the first end 2021 and a second back overlock stitch S2012 located on the back side 2003b of the second end 2031. The adhesive overlock stitch portion 2051 is at least a portion of which is provided with the second back overlock stitch S2012 which is bent down on one side and arranged opposite to the main body portion 2030.

[0220] According to this configuration, since the first end 2021 and the second end 2031 are integrally bound with the overlock stitch S2001, the process for fixing the ends can be simplified compared to the case where the first end 2021 and the second end 2031 are bound separately. By providing the adhesive overlock stitch portion 51 on only one side of the first back overlock stitch S2011 and the second back overlock stitch S2012 that is bent over and arranged opposite to the main body portions 2020 and 2030, the first end 2021 and the second end 2031 can be fixed to the main body portions 2020 and 2030, and the increase of adhesive can be suppressed compared to the case where the adhesive overlock stitch portion is also provided on the other side.

[0221] In the manufacturing method of the end fixing structure 2001, a first fabric 2002 having a first end 2021 and a second fabric 2003 having a second end 2031 are prepared. The first end 2021 and the second end 2031 are wrapped with a lockstitch thread S2001 including heat-fusion seams Sb and Sc. The first end 2021 and the second end 2031 are flat-stitched to form a seam portion 2004. The first end 2021 and the second end 2031 are bent down on one side or both sides and bonded to the main body portions 2020 and 2030 of the first fabric 2002 and / or the second fabric 2003 to form an end bonding portion 2005.

[0222] According to the present invention, the first end 2021 and the second end 2031, after being wrapped with a lockstitch thread S2001 including heat-melt seams Sb and Sc, can be fixed to the main body portions 2020 and 2030. Compared with the case where a tape component such as heat-melt adhesive is provided throughout the end bonding portion 2005, excessive distribution of adhesive can be suppressed. As a result, the ends of the fabric can be aesthetically fixed while suppressing the hardening and weight increase of the fabric.

[0223] The first end 2021 and the second end 2031 are integrally sewn together by overlock stitching S2001. The overlock stitching S2001 has a first back overlock stitching S2011 located on the back side 2002b of the first end 2021 and a second back overlock stitching S2012 located on the back side 2003b of the second end 2031. The first back overlock stitching S2011 or the second back overlock stitching S2012, which is at least bent down on one side and is arranged opposite to the main body 2020 and 2030, has heat-fused seams Sb and Sc.

[0224] According to this configuration, since the first end 2021 and the second end 2031 are integrally overlocked with a lockstitch line S2001, the process for fixing the ends is simplified compared to the case where the first end 2021 and the second end 2031 are overlocked separately. Since one of the first back lockstitch line S2011 and the second back lockstitch line S2012, which are at least bent over on one side and positioned opposite the main body portions 2020 and 2030, includes heat-fused seams Sb and Sc, the first end 2021 and the second end 2031 can be fixed to the main body portions 2020 and 2030. Compared to the case where the other also includes heat-fused seams Sb and Sc, the increase of adhesive can be suppressed.

[0225] The spacing P2001 of the overlock seam formed by the overlock line S2001 is more than 0.5mm and less than 3.0mm.

[0226] According to this configuration, the spacing P2001 of the overlock seam can be appropriately set. When the spacing P2001 is less than 0.5 mm, it is difficult to use a sewing machine or the like to move the sewing needle. If the spacing P2001 exceeds 3.0 mm, the molten adhesive 2091 distributed in the adhesive overlock line portion 2051 along the overlock line S2001 is prone to discontinuities, making it difficult to suppress the peeling of the first end 2021 and the second end from the main body portions 2020 and 2030.

[0227] The seam line S2001 is formed by spirally winding the hot-melt wires Sb and Sc, which contain hot-melt components, around the baseline Sa, which does not contain hot-melt components.

[0228] According to this configuration, even when the hot-melt wires Sb and Sc melt after hot-melt welding, the baseline Sa remains in the locking line portion of the adhesive part. Therefore, it is possible to suppress the detachment of the end due to years of deterioration, such as when the locking line portion 2051 of the adhesive part is locked with adhesive or the like.

[0229] The weight ratio of heat-fused wires Sb and Sc to the edge-locking wire S2001 is more than 25% and less than 50%.

[0230] According to this configuration, the ratio of the hot-melt wires Sb and Sc included in the seam allowance S2001 can be appropriately set. When the ratio of the hot-melt wires Sb and Sc included in the seam allowance S2001 is less than 25%, the amount of molten adhesive 2091 distributed in the adhesive seam allowance portion 2051 along the seam allowance S2001 is easily insufficient, resulting in insufficient adhesive strength or adhesive area, and easy peeling of the first end 2021 and the second end 2031 from the main body portions 2020 and 2030.

[0231] If the proportion of heat-fused seams Sb and Sc included in the overlock thread S2001 exceeds 50%, then if the thickness of the overlock thread S2001 is set to constant, the thickness of the baseline Sa will become thinner and the stitch strength will easily become weaker.

[0232] The melting temperature of Sb and Sc in the hot-melt wire is above 100 degrees and below 200 degrees.

[0233] According to this configuration, the melting temperature of the heat-fused threads Sb and Sc can be appropriately set. When the melting temperature is below 100 degrees Celsius, the heat-fused threads Sb and Sc may melt due to the increased temperature of the sewing needle 2006 caused by frictional heat between the sewing needle 2006 and the fabric during sewing. Additionally, melting may occur due to ironing, roller drying, etc., leading to a decrease in adhesive properties. If the melting temperature exceeds 200 degrees Celsius, colorfastness typically decreases, the fabric is prone to discoloration, and sometimes the fabric itself may dissolve.

[0234] The diameter Z1 of the overlock thread S2001 is more than 0.35 times and less than 0.9 times the length Z of the major axis 2061a of the thread hole 2061 of the sewing needle 2006 through which the overlock thread S2001 passes.

[0235] According to this configuration, the ratio of the diameter Z1 of the overlock thread S2001 to the length Z of the major axis 2061a of the thread hole 2061 of the sewing needle 2006 can be appropriately set. When the ratio of the diameter Z1 of the overlock thread S2001 is less than 0.35 times, the thickness of the overlock thread S2001 is insufficient, making it difficult to obtain the predetermined sewing strength. If the ratio of the diameter Z1 of the overlock thread S2001 exceeds 0.9 times, the temperature of the sewing needle 2006 rises due to the frictional heat generated between the thread hole 2061 and the passing overlock thread S2001, and sometimes the first heat-fusion threads Sb and Sc melt.

[0236] The sewing speed of the overlock thread S2001 can be adjusted by the rotation speed of the sewing machine motor (not shown), which is set to 3000 rpm or more and 8000 rpm or less.

[0237] According to this configuration, the sewing speed can be set appropriately. When the sewing speed is less than 3000 rpm, the production efficiency decreases. If the sewing speed exceeds 8000 rpm, the temperature of the sewing needle 2006 is easily increased due to the frictional heat between the sewing needle 2006 and the fabric during sewing, and the heat-fused threads Sb and Sc may sometimes melt due to the increased temperature of the sewing needle 2006.

[0238] In this embodiment, the structure of the first backlock edge line S2011 and the second backlock edge line S2012, including heat-fused threads Sb and Sc, has been described, but it is not limited thereto. For example, the second backlock edge line S2012, which is unilaterally bent and arranged opposite to the back surface 3b of the main body 2030 of the second fabric 2003, may include heat-fused threads Sb and Sc, while the first backlock edge line S2011 is composed of conventional yarns such as staple fiber yarn and filament yarn, which do not include heat-fused threads Sb and Sc. Staple fiber yarn refers to textile yarn made by processing short fibers.

[0239] In this embodiment, the end bonding portion 2005 is described as a structure formed by bending one side of the first end 2021 and the second end 2031 and heat-melting them to the back surface 2003b of the second fabric 2003. However, it is not limited to this. The end bonding portion 2005 may also be formed by bending one side of the first end 2021 and the second end 2031 and heat-melting them to the back surface 2002b of the first fabric 2002.

[0240] In this embodiment, the overlock stitching of the first end 2021 and the second end 2031 is described as an edge-cutting overlock stitching performed by a single-needle three-thread overlock stitching machine. However, it is not limited to this; the first end 2021 and the second end 2031 can also be stitched by a double-needle four-thread overlock stitching machine. In this case, since the needle thread S2003, which is arranged along the direction extending from the end of the fabric and fixes the loop to the fabric, consists of two threads, therefore, as Figure 29 As shown by the double-dotted line, one of the two needles and threads can also be used to replace the plain stitch of the S2004 suture thread.

[0241] In this embodiment, the structure of forming a seam portion 2004 by sewing the first end 2021 and the second end 2031 together with a plain seam after the first end 2021 and the second end 2031 are covered is described, but it is not limited to this and the seam portion 2004 (sewing line S2004) may not be present.

[0242] In this embodiment, the structure in which the first end 2021 and the second end 2031 are integrally stitched together has been described, but it is not limited thereto. For example, as Figure 33As shown, the first end 2121 and the second end 2131 can also be sewn with overlock stitches S2005 and S2006 respectively, and are flattened on both sides.

[0243] More specifically, it may also include: a first end 2121 of the first fabric 2102, which is overlocked with a first overlock thread S2005; a second end 2131 of the second fabric 2103, which is overlocked with a second overlock thread S2006; a seam 2104, which is sewn together with a seam thread S2007; and end bonding portions 2105, 2105, which bond the first end 2121 and the second end 2131, which are flattened on both sides, to the main body portion 2120 of the first fabric 2002 and the main body portion 2130 of the second fabric 2003, respectively.

[0244] The first overlock stitch S5 has a first back side stitch S2051 located on the back side 2102b of the first end 2121 and a first front side stitch S2052 located on the front side 2102c. The second overlock stitch S2006 has a second back side stitch S2061 located on the back side 2103b of the second end 2131 and a second front side stitch S2062 located on the front side 2103c.

[0245] Although the illustration is omitted, it is related to Figure 30 and Figure 31 Similarly, the amount of adhesive 2091 distributed in the adhesive seam line portion 2051 along the first seam line S2005 and the second seam line S2006 is greater than the amount of adhesive 2092 distributed in other portions R. The adhesive seam line portion 2051 may also be at least the portion provided with the first back side line S2051 and the second back side line S2061 arranged opposite to the main body portions 2120 and 2130.

[0246] according to Figure 33 The end fixing structure 200101 shown achieves the following effect.

[0247] The overlock seam has a first overlock seam S2005 that covers the first end 2121 and a second overlock seam S2006 that covers the second end 2131. The first overlock seam S2005 has a first back side line S2051 located on the back side 2102b side of the first end 2121 and a first front side line S2052 located on the front side 2102c side. The second overlock seam S2006 has a second back side line S61 located on the back side 2103b side of the second end 2131 and a second front side line S2062 located on the front side 2103c side. In the end bonding portion 2105, the first end 2121 and the second end 2131 are bent over on both sides and bonded to the main body portions 2120 and 2130 respectively. The overlock seam portion 2051 of the bonding portion is at least a portion that is provided with the first back side line S2051 and the second back side line S2061 arranged opposite to the main body portions 2120 and 2130.

[0248] According to this configuration, the first end 2121 and the second end 2131 can be bonded to the main body 2120 and 2130 respectively by using the adhesive 2091 distributed on the locking line portion 2051 of the adhesive portion.

[0249] The overlock seam has a first overlock seam S2005 that covers the first end 2121 and a second overlock seam S2006 that covers the second end 2131. The first overlock seam S2005 has a first back side line S2051 located on the back side 2102b side of the first end 2121 and a first front side line S2052 located on the front side 2102c side. The second overlock seam S2006 has a second back side line S2061 located on the back side 2103b side of the second end 2131 and a second front side line S2062 located on the front side 2103c side. In the end bonding portion 2105, the first end 2121 and the second end 2131 are bent on both sides and bonded to the main body portions 2120 and 2130 respectively. The first back side line S2051 and the second back side line S2061, which are arranged opposite to the main body portions 2120 and 2130, have heat-fused seams Sb and Sc.

[0250] According to this configuration, the first end 2121 and the second end 2131 can be bonded to the main body portions 2120 and 2130 using the heat-fusion lines Sb and Sc included in the first back side line S20051 and the second back side line S2061, which are arranged opposite to the main body portions 2120 and 2130, in the first overlock line S2005 and the second overlock line S2006, which are bent on both sides. Compared with the case where the first front side line S2052 and the second front side line S2062 also include heat-fusion lines Sb and Sc, the increase of adhesive can be suppressed.

[0251] The end fixing structure 2001 in this invention can be applied to the sewing of two or more pieces of fabric used in clothing, hats, bags, gloves, tents, tarpaulins, sleeping bags, sheets, umbrellas, etc.

[0252] The end fixing structure 2001 in this invention can replace the portion of the seam of a garment that is sewn with binding. Specifically, if used on the side seam, crotch seam, hem, armholes, shoulder seam, or other parts that are in close contact with the wearer, it can easily suppress friction against the wearer and eliminate uncomfortable contact.

[0253] It should be noted that the end fixing structure 2001 of the present invention is not limited to the configuration of the above embodiment and can be modified in various ways.

[0254] [Note] This disclosure includes the following methods.

[0255] [Method 1] A heat-fusion bonding sewing thread, which has the following characteristics: Baseline; The first hot-melt thread, comprising a hot-melt component, is twisted relative to the baseline in either an S-twist or a Z-twist direction; and The second hot-melt wire includes a hot-melt component and is twisted relative to the baseline in a direction different from the first hot-melt wire to the outer periphery of the first hot-melt wire.

[0256] [Method 2] According to the heat-fusion weldable sewing thread described in method 1, wherein... One direction is S-twist. The other direction is Z-twist.

[0257] [Method 3] According to method 1 or 2, the heat-fusion weldable sewing thread, wherein... The weight ratio of the first heat-fused wire and the second heat-fused wire relative to the sewing thread is more than 25% and less than 50%.

[0258] [Method 4] The heat-fusion sewing thread according to any one of methods 1 to 3, wherein... The melting temperature of the first and second hot-melt wires is above 100 degrees and below 200 degrees.

[0259] [Method 5] The heat-fusion sewing thread according to any one of methods 1 to 4, wherein... The twist count of the first hot-melt wire and the second hot-melt wire is above 450 twists / m and below 550 twists / m.

[0260] [Method 6] The heat-fusion sewing thread according to any one of methods 1 to 5, wherein... The diameter of the sewing thread is more than 0.35 times and less than 0.9 times the length of the long axis of the thread hole of the sewing needle through which the sewing thread passes.

[0261] [Method 7] The heat-fusion sewing thread according to any one of methods 1 to 6, wherein... The first and second hot-melt wires are polyamide-based fusion wires.

[0262] [Method 8] A method for manufacturing a waterproof joint structure, which uses the heat-fusion weldable sewing thread described in method 1, includes: The first end of the waterproof first fabric is overlocked with a first overlock thread including the heat-fusion seam thread. The second end of the waterproof second fabric is overlocked with a second overlock thread including the heat-fusion seam thread. With the first end and the second end overlapping, a seam is formed by sewing the first fabric and the second fabric together with a thread including the heat-fusion sewing thread. The first end and the second end are thermally fused together to form an end bonding portion. The suture thread of the sutured part is melted to seal the suture hole.

[0263] [Method 9] According to the manufacturing method of the waterproof joint structure described in method 8, wherein... The first fabric and the second fabric each have a first opposing surface and a second opposing surface that are opposite each other. The first overlock line has a first side line located on the first opposing surface and a first side line located on the first anti-opposing surface opposite to the first opposing surface. The second seam line has a second side line located on the second opposing surface and a second other side line located on the second anti-opposing surface opposite to the second opposing surface. The first and second side threads include the heat-fusion sewing thread.

[0264] [Method 10] A method for manufacturing a waterproof joint structure, which uses the heat-fusion weldable sewing thread described in method 1, includes: Prepare a first piece of fabric having a first end and a second piece of fabric having a second end. An adhesive component is disposed between the first end and the second end. With the first end and the second end overlapping, sew with the first overlock stitch. With the first end and the second end overlapping, a seam is formed by sewing the first fabric and the second fabric together with a thread including the heat-fusion sewing thread. The adhesive component is melted, and the first end and the second end are thermally fused together to form an end adhesive portion. The suture thread of the sutured part is melted to seal the needle hole.

[0265] [Method 11] A method for manufacturing a waterproof joint structure, which uses the heat-fusion weldable sewing thread described in method 1, includes: Prepare a first piece of fabric having a first end and a second piece of fabric having a second end. With the first end and the second end overlapping, ultrasonic bonding is performed to form an end-bonded portion. A suture portion is formed by sewing the first end and the second end together with a suture thread including the heat-fusion bonding thread. The suture thread of the sutured part is melted to seal the needle hole.

[0266] [Method 12] A waterproof joint structure, manufactured by the manufacturing method described in method 8, has the following characteristics: A first piece of fabric, having a first end; A second piece of fabric, having a second end; End bonding portion, which bonds the first end and the second end; and The suture section is formed by stitching the first end and the second end together with suture thread, and the needle holes of the suture thread are sealed with adhesive.

[0267] [Method 13] According to the waterproof joint structure described in method 12, wherein, The suture section is composed of a flat seam.

[0268] [Method 14] According to the waterproof joint structure described in method 12 or 13, wherein, The end bonding portion is an adhesive portion bonded by an adhesive component disposed between the first end and the second end.

[0269] [Method 15] According to the waterproof joint structure described in method 12 or 13, wherein, The first end and the second end are respectively overlocked with the first overlock thread and the second overlock thread. The end bonding portion is a portion of the first end and the second end bonded together using adhesive distributed in the bonding portion locking line portion along the first locking line and the second locking line. In the end bonding portion, the amount of adhesive distributed in the locking line portion of the bonding portion is greater than the amount of adhesive distributed in other portions.

[0270] [Method 16] According to the waterproof joint structure described in method 15, wherein... The first fabric and the second fabric each have a first opposing surface and a second opposing surface that are opposite to each other. The first overlock line has a first side line located on the first opposing surface and a first side line located on the first anti-opposing surface opposite to the first opposing surface. The second seam line has a second side line located on the second opposing surface and a second other side line located on the second anti-opposing surface opposite to the second opposing surface. The adhesive edge locking line portion is at least the portion provided with the first side edge line and the second side edge line.

[0271] [Method 17] According to the waterproof joint structure described in method 12 or 13, wherein, The end bonding portion is an ultrasonic welding portion that fuses the first end and the second end together without the use of an adhesive to weld the first fabric and the second fabric.

[0272] [Method 18] A method for manufacturing an end-fixing structure, which uses the end-fixing structure of the heat-fusion sewing thread described in method 1, includes: Prepare a first piece of fabric having a first end and a second piece of fabric having a second end. The first end and the second end are overlocked with overlock thread including the heat-fusion seam thread. The first end and the second end are bent over on one side or both sides to melt the heat-fusion sewing thread and bond it to the main body of the first fabric and / or the second fabric to form an end bond.

[0273] [Method 19] The manufacturing method of the end fixing structure according to method 18 includes: The first end and the second end are integrally sewn together by the overlock stitch using a binding seam. The overlock stitching has a first back overlock stitching located on the back side of the first end and a second back overlock stitching located on the back side of the second end. The first backlock edge or the second backlock edge, which is at least folded down on one side and is positioned opposite the main body, has the heat-fusion sewing thread.

[0274] [Method 20] The manufacturing method of the end fixing structure according to method 18, wherein... The overlock stitching has a first overlock stitching that sews over the first end and a second overlock stitching that sews over the second end. The first overlock seam has a first back side line located on the back side of the first end and a first front side line located on the front side. The second overlock seam has a second back side seam located on the back side of the second end and a second front side seam located on the front side. In the end bonding portion, the first end and the second end are bent over on both sides and bonded to the main body portion respectively. At least the first back side thread and the second back side thread, which are arranged opposite to the main body, have the heat-fusion sewing thread.

[0275] [Method 21] An end-fixing structure, a waterproof joint structure manufactured by the manufacturing method described in Method 18, has the following characteristics: A first piece of fabric, having a first end; A second piece of fabric, having a second end; Overlock stitching, which covers the first end and the second end; and An end-bonding portion, which bonds the first end and the second end to the main body of the first fabric and / or the second fabric by bending down one or both sides. In the end bonding portion, the amount of adhesive distributed in the bonding portion locking line portion along the locking line is greater than the amount of adhesive distributed in other portions.

[0276] [Method 22] According to the end fixing structure described in method 21, wherein... The first end and the second end are integrally sewn together by the overlock stitch using a binding seam. The overlock stitching has a first back overlock stitching located on the back side of the first end and a second back overlock stitching located on the back side of the second end. The adhesive seam portion is at least a portion that has a first back seam or a second back seam that is bent down on one side and is positioned opposite the main body portion.

[0277] [Method 23] According to the end fixing structure described in method 21, wherein... The overlock stitching has a first overlock stitching that covers the first end and a second overlock stitching that covers the second end. The first overlock seam has a first back side line located on the back side of the first end and a first front side line located on the front side. The second overlock seam has a second back side seam located on the back side of the second end and a second front side seam located on the front side. In the end bonding portion, the first end and the second end are bent over on both sides and bonded to the main body portion respectively. The adhesive seam portion is at least a portion that has the first back side line and the second back side line arranged opposite to the main body portion.

[0278] Explanation of reference numerals in the attached figures 6 sewing needles 61 wire hole S1 heat-sealing sewing thread Sa baseline Sb lower thermofusion connector (first thermofusion connector) Sc hot melt connector (second hot melt connector)

Claims

1. A heat-fusion sewing thread, characterized in that, have: Baseline; The first hot-melt thread, comprising a hot-melt component, is twisted relative to the baseline in either an S-twist or a Z-twist direction; and The second hot-melt wire includes a hot-melt component and is twisted relative to the baseline in a direction different from the first hot-melt wire to the outer periphery of the first hot-melt wire.

2. The heat-fusion weldable sewing thread according to claim 1, characterized in that, One direction is S-twist. The other direction is Z-twist.

3. The heat-fusion weldable sewing thread according to claim 1 or 2, characterized in that, The weight ratio of the first heat-fused wire and the second heat-fused wire relative to the sewing thread is more than 25% and less than 50%.

4. The heat-fusion weldable sewing thread according to claim 1 or 2, characterized in that, The melting temperature of the first and second hot-melt wires is above 100 degrees and below 200 degrees.

5. The heat-fusion weldable sewing thread according to claim 1 or 2, characterized in that, The twist count of the first hot-melt wire and the second hot-melt wire is above 450 twists / m and below 550 twists / m.

6. The heat-fusion weldable sewing thread according to claim 1 or 2, characterized in that, The diameter of the sewing thread is more than 0.35 times and less than 0.9 times the length of the long axis of the thread hole of the sewing needle through which the sewing thread passes.

7. A heat-fusion sewing thread, characterized in that, The first and second hot-melt wires are polyamide-based fusion wires.

8. A method for manufacturing a waterproof joint structure, characterized in that, A method for manufacturing a waterproof joint structure using the heat-fusion sewing thread as described in claim 1, comprising: The first end of the waterproof first fabric is overlocked with a first overlock thread including the heat-fusion seam thread. The second end of the waterproof second fabric is overlocked with a second overlock thread including the heat-fusion seam thread. With the first end and the second end overlapping, a seam is formed by sewing the first fabric and the second fabric together with a thread including the heat-fusion sewing thread. The first end and the second end are thermally fused together to form an end bonding portion. The suture thread of the sutured part is melted to seal the needle hole.

9. The method for manufacturing the waterproof joint structure according to claim 8, characterized in that, The first fabric and the second fabric each have a first opposing surface and a second opposing surface that are opposite each other. The first overlock line has a first side line located on the first opposing surface and a first side line located on the first anti-opposing surface opposite to the first opposing surface. The second seam line has a second side line located on the second opposing surface and a second other side line located on the second anti-opposing surface opposite to the second opposing surface. The first side thread and the second side thread include the heat-fusion sewing thread.

10. A method for manufacturing a waterproof joint structure, characterized in that, The method for manufacturing a waterproof joint structure using the heat-fusion sewing thread as described in claim 1 includes: Prepare a first piece of fabric having a first end and a second piece of fabric having a second end. An adhesive component is disposed between the first end and the second end. With the first end and the second end overlapping, sew with the first overlock stitch. With the first end and the second end overlapping, a seam is formed by sewing the first fabric and the second fabric together with a thread including the heat-fusion sewing thread. The adhesive component is melted, and the first end and the second end are thermally fused together to form an end adhesive portion. The suture thread of the sutured part is melted to seal the needle hole.

11. A method for manufacturing a waterproof joint structure, characterized in that, The method for manufacturing a waterproof joint structure using the heat-fusion sewing thread as described in claim 1 includes: Prepare a first piece of fabric having a first end and a second piece of fabric having a second end. With the first end and the second end overlapping, ultrasonic bonding is performed to form an end-bonded portion. A suture portion is formed by sewing the first end and the second end together with a suture thread including the heat-fusion bonding thread. The suture thread of the sutured part is melted to seal the needle hole.

12. A waterproof joint structure, characterized in that, The waterproof joint structure manufactured by the manufacturing method described in claim 8 has the following characteristics: A first piece of fabric, having a first end; A second piece of fabric, having a second end; An end bonding portion, which bonds the first end and the second end; and The suture section is formed by stitching the first end and the second end together with suture thread, and the needle holes of the suture thread are sealed with adhesive.

13. The waterproof joint structure according to claim 12, characterized in that, The suture section is composed of a flat seam.

14. The waterproof joint structure according to claim 12 or 13, characterized in that, The end bonding portion is an adhesive portion bonded by an adhesive component disposed between the first end and the second end.

15. The waterproof joint structure according to claim 12 or 13, characterized in that, The first end and the second end are respectively overlocked with the first overlock thread and the second overlock thread. The end bonding portion is a portion of the first end and the second end bonded together using adhesive distributed in the bonding portion locking line portion along the first locking line and the second locking line. In the end bonding portion, the amount of adhesive distributed in the locking line portion of the bonding portion is greater than the amount of adhesive distributed in other portions.

16. The waterproof joint structure according to claim 15, characterized in that, The first fabric and the second fabric each have a first opposing surface and a second opposing surface that are opposite each other. The first overlock line has a first side line located on the first opposing surface and a first side line located on the first anti-opposing surface opposite to the first opposing surface. The second seam line has a second side line located on the second opposing surface and a second other side line located on the second anti-opposing surface opposite to the second opposing surface. The adhesive edge locking line portion is at least the portion provided with the first side edge line and the second side edge line.

17. The waterproof joint structure according to claim 12 or 13, characterized in that, The end bonding portion is an ultrasonic welding portion that fuses the first end and the second end together with the first fabric and the second fabric without the use of an adhesive.

18. A method for manufacturing an end fixing structure, characterized in that, The manufacturing method using the end fixing structure of the heat-fusion sewing thread according to claim 1 includes: Prepare a first piece of fabric having a first end and a second piece of fabric having a second end. The first end and the second end are overlocked with overlock thread including the heat-fusion seam thread. The first end and the second end are bent over on one side or both sides to melt the heat-fusion sewing thread and bond it to the main body of the first fabric and / or the second fabric to form an end bond.

19. The manufacturing method of the end fixing structure according to claim 18, characterized in that, The first end and the second end are integrally sewn together by the overlock stitch using a binding seam. The overlock seam has a first back overlock seam located on the back side of the first end and a second back overlock seam located on the back side of the second end. The first backlock edge or the second backlock edge, which is at least folded down on one side and positioned opposite the main body, has the heat-fusion sewing thread.

20. The manufacturing method of the end fixing structure according to claim 18, characterized in that, The overlock stitching has a first overlock stitching that sews over the first end and a second overlock stitching that sews over the second end. The first overlock seam has a first back side line located on the back side of the first end and a first front side line located on the front side. The second overlock seam has a second back side seam located on the back side of the second end and a second front side seam located on the front side. In the end bonding portion, the first end and the second end are bent over on both sides and bonded to the main body portion respectively. At least the first back side thread and the second back side thread, which are arranged opposite to the main body, have the heat-fusion sewing thread.

21. An end-fixing structure, characterized in that, The waterproof joint structure manufactured by the manufacturing method of claim 18 has the following characteristics: A first piece of fabric, having a first end; A second piece of fabric, having a second end; Overlock stitching, which covers the first end and the second end; and An end-bonding portion, which bonds the first end and the second end to the main body of the first fabric and / or the second fabric by bending down one or both sides. In the end bonding portion, the amount of adhesive distributed in the bonding portion locking line portion along the locking line is greater than the amount of adhesive distributed in other portions.

22. The end fixing structure according to claim 21, characterized in that, The first end and the second end are integrally sewn together by the overlock stitch using a binding seam. The overlock stitching has a first back overlock stitching located on the back side of the first end and a second back overlock stitching located on the back side of the second end. The adhesive seam portion is at least a portion that has a first back seam or a second back seam that is bent down on one side and is positioned opposite the main body portion.

23. The end fixing structure according to claim 21, characterized in that, The overlock stitching has a first overlock stitching that covers the first end and a second overlock stitching that covers the second end. The first overlock seam has a first back side line located on the back side of the first end and a first front side line located on the front side. The second overlock seam has a second back side seam located on the back side of the second end and a second front side seam located on the front side. In the end bonding portion, the first end and the second end are bent over on both sides and bonded to the main body portion respectively. The adhesive seam portion is at least a portion that has the first back side line and the second back side line arranged opposite to the main body portion.

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