HK1029901B - Waterproof slide fastener and manufacturing method thereof - Google Patents

Description

Waterproof slide fastener and method for manufacturing the same

Technical Field

The present invention relates to a waterproof slide fastener used as an opening/closing device for ski shirts, sports bags and other similar articles by providing a fastener tape having a waterproof function, and a method of manufacturing this waterproof slide fastener.

Background

Conventionally, there has been known a fastener tape in which a synthetic resin film is fused to the entire one surface of a pair of left and right fastener tapes. According to a slide fastener disclosed in Japanese Utility model laid-open No. 40-17549, for example, as shown in FIG. 19, a synthetic resin film 4 ' is stacked and fused to the entire rear surfaces of the pair of left and right fastener tapes 3 ', and a core thread 7 ' is fixed to one side 11 ' of the fastener tape 3 '. Then, the fastener elements 5' are all mounted to this core wire fixing portion to make a slide fastener having a waterproof effect.

In such a slide fastener known so far, synthetic resin films are fused to the entire surfaces of the pair of fastener tapes, and a layer of synthetic resin film is fused to the fastener tapes by heating. Therefore, the synthetic resin film is not locally present on the surface of the fastener tape, or a so-called perforation phenomenon, in which a hole is formed by the penetration of a sewing thread, is generated, and thus there is a problem that the fastener tape is damaged by losing the waterproof effect. Further, the molten synthetic resin film may adhere not only to the fastener tape but also possibly to a heating/pressing body for applying pressure and heat. Therefore, it is difficult to control the heating process for firmly fusing the synthetic resin film to the fastener tape.

Disclosure of Invention

The present invention has been made in view of the above problems. An object of the present invention is to provide a waterproof slide fastener in which a synthetic resin composite layer including a low melting point resin layer and a high melting point resin layer is used as a synthetic resin film fused to a fastener tape to prevent a perforation phenomenon from occurring in the synthetic resin film, and the synthetic resin film can be firmly fused to the fastener tape.

Another object of the present invention is to provide a slide fastener having a waterproof effect, in which only a low melting point resin layer is melted at a temperature at which a high melting point resin layer is not melted by heating and pressing by determining melting points of the low melting point resin layer and the high melting point resin layer of a synthetic resin composite film, so that the low melting point resin layer can be firmly fixed to a fastener tape.

It is still another object of the present invention to provide a slide fastener having a waterproof effect in which a synthetic resin composite film is fused to reinforce a waterproof function on a side edge, i.e., a side where left and right fastener tapes abut when left and right fixing side fastener tapes are engaged.

It is still another object of the present invention to provide a slide fastener having a waterproof effect, wherein the waterproof effect of the slide fastener can be obtained even when a synthetic resin composite film is fused to either of the front and rear surfaces of the left and right fastener tapes.

It is still another object of the present invention to provide a slide fastener having a waterproof effect, wherein the waterproof form is defined as fixing the waterproof effect on a portion where straight-shaped fastener elements are sewn when a synthetic resin composite film is fused on the surfaces of left and right fastener tapes, thereby obtaining an effective waterproof effect.

It is still another object of the present invention to provide a slide fastener having a waterproof effect in which a synthetic resin composite film is fused to front and rear faces of a fastener tape forming a fastener cord, and linear fastener elements are sewn to the front and rear faces to obtain airtightness and watertightness.

It is an object of another aspect of the present invention to provide a method of manufacturing a slide fastener having a waterproof effect, that is, capable of manufacturing a fastener stringer in which a synthetic resin composite film composed of a low-melting-point resin layer and a high-melting-point resin layer is used as a synthetic resin film and is fused to a fastener tape to prevent a perforation phenomenon from occurring in the synthetic resin film, and the synthetic resin film can be reliably fused to the fastener tape.

According to an object of the present invention, there is provided a method of manufacturing a slide fastener having a waterproof effect, i.e., capable of manufacturing a fastener stringer which is convenient and reliable to have an excellent waterproof function.

In order to achieve the above object, according to one aspect of the present invention, there is provided a waterproof slide fastener in which a synthetic resin composite layer composed of a low-melting-point resin layer and a high-melting-point resin layer is fused to one surface or both surfaces of each of a pair of left and right fastener tapes in the slide fastener, so that the low-melting-point resin layer is brought into contact with and opposed to the surfaces of the fastener tapes by applying pressure and heat, while the fastener elements are attached to the side edges of the fastener tapes by sewing, for example, loop-shaped or zigzag-shaped fastener elements made of a single fiber are attached to the fastener tapes, or loop-shaped straight-shaped fastener elements are woven or knitted into the fastener tapes, or by crimping or injection molding into single metal or.

Preferably, the synthetic resin composite film is composed of a low-melting resin layer having a melting point of 110 to 130 ℃ and a high-melting resin layer having a melting point of 160 to 200 ℃.

Preferably, the synthetic resin composite film is composed of a low-melting-point resin layer having a melting point of 100 ℃ to 140 ℃ and a high-melting-point resin layer having a melting point of 150 ℃ to 230 ℃.

More preferably, a synthetic resin composite film fused to the fastener tapes is formed to protrude from the left and right fastener tape side edges and the coupling center points of the fastener elements mounted on the side edges.

Preferably, the fastener elements are mounted on the front surfaces of the opposite side edges of the left and right fastener tapes, and the synthetic resin composite film is fused on the entire rear surface of the fastener tape.

Preferably, a synthetic resin composite film is fused to the entire front surface of each of the left and right fastener tapes, and the coupling elements are attached to the synthetic resin composite film fused to the front surfaces of the opposite side edges of the fastener tapes.

Preferably, a synthetic resin composite film is fused to the entire surface of each of the left and right fastener tapes, the loop-shaped or zigzag-shaped linear elements are sewn to the synthetic resin composite film fused to the front surfaces of the opposite side edges of the fastener tapes, and the rear surface of the fastener tape, to which the linear elements are sewn, is subjected to a water-repellent finish treatment.

Further, a synthetic resin composite film is fused to the respective entire surfaces of the left and right fastener tapes, and the ring-shaped or zigzag-shaped linear elements are sewn to the synthetic resin composite film fused to the opposite side edge front surfaces of the fastener tapes, while sewing threads for fixing the linear elements are subjected to a water-repellent finish treatment.

Preferably, a synthetic resin composite film is fused to the entire surface of each of the left and right fastener tapes, a pair of loop-shaped or zigzag-shaped linear elements are placed and sewn on the front surface of the fused synthetic resin so as to be opposed to each other, and the mating ends of the linear elements are opposed to each other at a predetermined interval, the fastener tapes are overlapped at the midpoint between the pair of sewn linear elements, while the overlapped surfaces of the fastener tapes are bonded to each other at a stage ensuring air impermeability and water impermeability.

According to another aspect of the present invention, there is provided a method of manufacturing a waterproof slide fastener, including the steps of: mounting sprockets on opposite side surfaces of the left and right pairs of fastener tapes; heating a synthetic resin composite film composed of a low-melting-point resin layer and a high-melting-point resin layer under pressure after the left and right fastener elements are mated, and fusing to the entire rear surfaces of the respective combined left and right fastener tape pairs with the low-melting-point resin layer in contact with and opposed to the fastener tapes to fuse the low-melting-point resin layer to the fastener tapes; the synthetic resin composite film between the left and right zipper tapes is cut to make a zipper strip.

Preferably, after the left and right fastener tapes mounted on the opposite respective side edge surfaces of the pair of left and right fastener tapes are engaged, the fastener elements are held in a gap between the opposite side edges by pulling the left and right fastener tapes left and right or by designing the fastener elements in a mountain shape to project toward the side edges of the fastener tapes while the synthetic resin composite film is fused to the fastener tapes by applying pressure and heat.

Drawings

Fig. 1 is a sectional view of a fastener stringer of a first embodiment of a slide fastener having a waterproof effect according to the present invention.

Fig. 2 is a plan view of the fastener stringer.

Fig. 3 is a sectional view of the synthetic resin composite film before being fused to the fastener stringer.

Fig. 4 is a schematic view showing the manufacturing process of the fastener stringer.

Fig. 5 is a perspective view showing a heating/pressing step in the manufacturing process of the fastener stringer.

Fig. 6 is a sectional view showing another form of fusion bonding of the synthetic resin composite film to the fastener stringer in a step before the fusion bonding.

Fig. 7 is a cross-sectional view of a zipper cord showing another form of the linear teeth of the zipper strip.

Fig. 8 is a sectional view of a fastener stringer of a second embodiment of a slide fastener having a waterproof effect according to the present invention.

Fig. 9 is a cross-sectional view of a fastener cord showing another form of the fastener cord.

Fig. 10 is a cross-sectional view of a fastener stringer showing another form of the fastener stringer.

Fig. 11 is a sectional view of the fastener stringer, showing a modification of the fastener cord.

Fig. 12 is a sectional view of the fastener stringer, showing a modification of the fastener cord.

Fig. 13 is a sectional view of a fastener stringer of a third embodiment of a slide fastener having a waterproof effect according to the present invention.

Fig. 14 is a sectional view of the fastener stringer, showing a modification of the fastener cord.

Fig. 15 is a sectional view of the fastener stringer, showing still another modification of the fastener stringer.

Fig. 16 is a plan view of a fastener stringer of a fourth embodiment of a slide fastener having a waterproof effect according to the present invention.

Fig. 17 is a sectional view of a fastener stringer of a fifth embodiment of the slide fastener having a waterproof effect according to the present invention.

Fig. 18 is an enlarged partial sectional view showing a modification of the synthetic resin composite film.

Fig. 19 is a cross-sectional view of a known link having a waterproof effect.

Detailed Description

Hereinafter, embodiments of the waterproof slide fastener of the present invention and a method of manufacturing the same will be described in detail with reference to the accompanying drawings.

In the slide fastener having a waterproof effect of the present invention, the fastener tape 3 is woven or knitted by synthetic resin fibers such as polyamide fibers and polyethylene fibers, and the double-layer synthetic resin composite film 4 composed of the low-melting-point resin layer 12 and the high-melting-point resin layer 13 is fused to one surface of this fastener tape by applying pressure and heat. Therefore, the zipper has a waterproof function.

In the first embodiment of the slide fastener having the waterproof effect shown in fig. 1 and 2, a core thread 7 is passed through the inside of a linear loop element 5 made of synthetic resin monofilament such as polyamide and polyethylene, and a leg portion 15 of the loop element 5 is sewn with a sewing thread 6 to the surface of the side edge 11 of the fastener tape 3 with a sewing machine by a multiple-thread chain stitch to form a fastener cord 2. Then, the left and right fastener stringers 2 are connected to form a fastener stringer 1.

As shown in fig. 3, the synthetic resin composite film 4 is formed by bonding together a low melting point resin layer 12 and a high melting point resin layer 13 each made of urethane-based resin, or by coating the low melting point resin layer 12 on the high melting point resin layer 13. The melting point of the low-melting resin layer is 100-140 deg.C, preferably 110-130 deg.C, the melting point of the high-melting resin layer is 150-230 deg.C, preferably 160-200 deg.C, and polyethylene-based resin can be used instead of urethane-based resin. Further, by using a thermoplastic elastomer as the material of the synthetic resin composite layer 4, the flexible fastener stringer 1 having a waterproof effect can be produced.

Since the synthetic resin composite film 4 is disposed such that the low melting point resin layer 12 faces the pair of fastener tapes 3 on the rear surface of the fastener stringer 1 (as shown in fig. 1), the synthetic resin composite film 4 is heated under pressure to be fused to the entire surface of the fastener tape 3. Then, the synthetic resin composite film 4 caught between the side edges 11 of the left and right fastener tapes 3 is cut between the side edges 11 to form the fastener stringer 1.

The cut synthetic resin composite film 4 is protruded from the side edge 11 of each fastener tape 3. Further, when the engaging heads 14 of the left and right loop-shaped fastener elements 5 are engaged with each other, the cut synthetic resin film 4 is protruded from the engagement midpoint. Therefore, when the loop elements 5 of the left and right fastener tapes 2 are engaged with each other, the synthetic resin composite film 4 protruding from the side edge 11 of the fastener tape 3 is abutted against one of the pair, thereby obtaining a waterproof function. When this fastener stringer 1 is used, the fastener stringer is sewn to an article to be mounted, with the side to which the synthetic resin composite film 4 is fused serving as the front side and the side to which the loop-shaped fastener elements 5 are mounted serving as the rear side.

Meanwhile, the synthetic resin composite film 4 may be transparent or translucent so that the color of the fastener tape 3 can be seen through the film. Further, by embossing the surface of the high-melting-point resin layer 13, the synthetic resin composite film 4 can also be provided with an uneven pattern or a woven pattern. Therefore, the surface of the synthetic resin composite film 4 may become rough, increasing the adhesion to the article to be mounted.

Next, a method of manufacturing the slide fastener having the waterproof effect will be explained. As shown in fig. 4 and 5, in one step of fusing the synthetic resin composite film 4 to the fastener stringer 1, the fastener stringer 1 is wound on a reel supported by a supporting shaft 31 to function as a stringer output portion 22, and passes between a heating roller 25 driven by a rotating shaft 29 and a pressing roller 26 driven by a rotating shaft 28. Finally, the fastener stringer 1 is wound around the winding roller 24 driven by a driving shaft 33.

At this time, the synthetic resin composite film 4 is wound around a reel supported by a support shaft 32, is output as a synthetic resin composite film 23 separated from the fastener stringer output portion 22, and passes between the heating roller 25 and the pressing roller 26. The fastener stringer 1 and the synthetic resin composite film 4 pass between the heating roller 25 and the pressing roller 26, and the fastener stringer 1 and the low-melting-point resin layer 12 of the synthetic resin composite film 4 are brought into relative contact, so that the low-melting-point resin layer 12 is melted and fused to the fastener tape 3 by the heating roller 25 and the pressing roller 26. Thus, the synthetic resin composite film 4 is attached to the fastener stringer 1.

In a step just before the fastener stringer 1 to which the synthetic resin composite film 4 is fused is wound on the winding roller 24, the synthetic resin composite film 4 caught between the side edges of the opposing fastener tapes 3 is cut at the center of the side edge 11 by a cutter blade 30 placed on a cutting portion 21. Thus, the entire fastener stringer 1 is divided into left and right fastener stringers 2.

In the fusing step, as shown in fig. 5, a groove portion 27 is formed on the surface of the pressing roller 26 so that the mating coil element 5 of the fastener stringer 1 is inserted therein and guided thereby. In addition, when the synthetic resin composite film 4 is fused, only the low melting point resin layer 12 is melted and bonded while the high melting point resin layer 13 is not melted, so that a perforation phenomenon due to heating under a pressurized condition does not occur, so that the surface can be maintained smooth.

The step of fusing the synthetic resin composite film 4 to the fastener stringer 1 as shown in fig. 6 is characterized in that the fastener tape 3 and the synthetic resin composite film 4 are bonded together so that a slightly larger amount of the synthetic resin composite film 4 is present between the opposite side edges 11 of the left and right fastener stringers 3 on the fastener stringer 1 than in the above example for reinforcing the waterproof effect. That is, as shown in fig. 5, the surface of the pressure roller 26 is formed in a mountain shape gradually protruding toward the center of the surface, while the surface of the heat roller 25 (assumed to be opposite to the pressure roller 26) is formed in a V shape gradually deepening toward the center of the surface. By passing the fastener stringer 1 between the pressing roller 26 and the heating roller 25, a gap between the side edges 11 of the left and right fastener tapes 3 becomes large, so that the synthetic resin composite film 4 longer than the usual dimension of the gap between the side edges 11 is disposed so as to straddle between the side edges 11. Therefore, after the synthetic resin composite film 4 between the side edges 11 is cut, the cut ends of the synthetic resin composite film 4 are firmly fitted to each other to close the gap, thereby preventing water leakage between the cuts. Therefore, the waterproof effect on the side edge 11 of the fastener tape 3 can be enhanced. Meanwhile, by pulling the fastener tape 3 to the left and right sides of the fastener stringer 1 where the left and right fastener stringers 2 are engaged with each other, the gap between the side edges 11 of the fastener stringer 1 can be made large.

Fig. 7 shows a variant of the straight sprocket 5. In such a type of linear sprocket 5, synthetic resin single fibers are formed in a zigzag shape, and the midpoint of the sprocket is bent. Then, so-called zigzag type, i.e., zigzag-shaped elements 5 are sewn to the surface of the side edge 11 of the fastener tape 3. A core thread 7 is interposed and held between the upper and lower leg portions 15, the core thread 7 being sewn with a sewing thread 6 in a multi-thread chain stitch. The left and right fastener stringers 2 cooperate with each other to form a fastener stringer 1, and then, a synthetic resin composite film 4 is fused to the entire rear surface of the fastener stringer 1. Next, the fused synthetic resin composite film 4 between the side edges 11 of the left and right fastener tapes 3 is cut, so that the fastener stringer 1 is separated into left and right portions. In this fastener stringer 2, the side edges of the synthetic resin composite film 4 are also exposed to the outside.

As shown in fig. 8, in the second embodiment of the fastener stringer 2 according to the waterproof effect, the synthetic resin composite film 4 is fused on the side where the loop-shaped element 5 is sewn. The double-layer synthetic resin composite film 4 composed of the low-melting-point resin layer 12 and the high-melting-point resin layer 13 is placed on the surface of the fastener tape 3, and is placed so that the low-melting-point resin layer 12 faces the fastener tape and is fused thereto by pressurization and heating. At the same time, the synthetic resin composite film 4 is fused to protrude from the side edge 11 of the fastener tape 3.

The fastener cord 2 is manufactured by sewing the leg portion 15 of the loop fastener element 5 to the surface of the side edge 11 of the fastener tape 3 in which the synthetic resin composite film 4 is fused with the sewing thread 6 of the multi-thread chain stitch sewing. When this fastener stringer 2 is used, the loop-shaped fastener element 5 is attached to the article to be attached so that it is exposed on the front surface of the article. Further, by subjecting the sewing thread 6 itself to the water-repellent finish treatment, water does not penetrate in the sewing thread 6 and does not reach the rear face of the fastener tape 3. Therefore, the waterproof effect can be further enhanced.

As shown in fig. 9, in the fastener chain 2 of a modification of the second embodiment, the loop-shaped fastener elements 5 are sewn to the front face of the side edge 11 of the fastener tape 3 with the sewing thread 6, and the rear surface of the fastener tape 3 on a part of the sewing thread 6 is coated with a synthetic resin sealant 9 or synthetic resin varnish 9 to prevent water from leaking to the rear surface of the fastener tape 3 along the sewing thread 6. Therefore, the waterproof effect can be further enhanced.

In a fastener stringer 2 of still another modification of the second embodiment, as shown in fig. 10, a loop element 5 is sewn with a sewing thread 6 to a front surface of a side edge 11 of a fastener tape 3 whose surface is coated with a synthetic resin composite film 4. A synthetic resin film 8 is bonded or fused to the rear surface of the fastener tape 3 at the sewing thread 6 portion to enhance the waterproof effect. Meanwhile, one end of the synthetic resin film 8 may be brought into contact with the synthetic resin composite film 4.

As shown in fig. 11, in a fastener stringer 1 of still another modification of the second embodiment, synthetic resin composite films 4 are entirely placed on the front and rear surfaces of a fastener tape 3 and fused to the fastener tape 3 by heating under pressure. Then, the loop fastener elements 5 are sewn with sewing yarns 6 to the surface of the side edge 11 of the fastener tape 3, and both the front and rear surfaces of the fastener tape 3 are covered with the synthetic resin composite film 4. Then, the synthetic resin composite film 4 is fused to the fastener tape 3 such that each end thereof extends beyond a midpoint at which the left and right loop-shaped fastener elements are mated with each other, to prevent water from leaking along the mating surfaces of the left and right fastener stringers.

As shown in fig. 12, in the fastener tape 2 of the further modification of the second embodiment, although the loop-shaped elements 5 of the fastener tape 2 are sewn to the fastener tape 3 with the sewing thread 6 in the multi-thread chain stitch shown in fig. 11, a heat-fusible thread is also used as the face yarn 18 of the multi-thread chain stitch sewing yarn 6. Therefore, the face yarn 18 may be melted by heating, and thus may be fused to the synthetic resin film 4 or the melted yarn may fill the gap around the face yarn 18 to prevent water from leaking around the face yarn 18. Meanwhile, a fusible link may be used as the loop wire 17.

As shown in fig. 13, in the fastener stringer 2 of the waterproof effect slide fastener according to the third embodiment, the synthetic resin composite film 4 composed of the low melting point resin layer 12 and the high melting point resin layer 13 is fused to the entire surface of the fastener tape 3. A pair of loop-shaped fastener elements 5 are provided on the synthetic resin composite film 4 fused to the fastener tape 3 to be opposed at a predetermined interval, i.e., sewn with the sewing thread 6 of a multi-thread chain stitch, so that the counter heads 14 are opposed at a predetermined interval. In this case, the fastener tape 3 is folded back in the gap between the pair of loop-shaped elements 5 so that the two folded portions are overlapped and the opposing surfaces of the fastener tape 3 are bonded to each other by the synthetic resin adhesive 10. In this case, the loop-shaped element 5 is provided on both the front and rear surfaces of the fastener cord 2.

In this fastener stringer 2, when the fastener tape 3 is folded back and the two folded portions are overlapped, one end side of the synthetic resin composite film 4 constituted at the side edge 11 of the fastener tape 3 is protruded to the mating head 14 of the left and right loop-shaped elements 5. Thus, a slide fastener having high air-and water-tightness can be obtained.

As shown in fig. 14, in the fastener stringer 2 in a modification of the third embodiment, by limiting the overlapped portion of the fastener tapes 3 (shown in fig. 13) in the fastener stringer 2 to a portion where the loop element 5 is sewn, the material cost can be reduced. Further, another modified form of the fastener chain 2 shown in fig. 15 is formed such that: when the left and right loop-shaped fastener elements 5 are engaged with each other, the end edge of the synthetic resin composite film 4 fused to the fastener tape 3 slightly protrudes from the engagement midpoint.

As shown in fig. 16, in the fastener chain 2 according to the fourth embodiment, the loop-shaped linear elements 5 are attached to the side edges 11 of the fastener tapes 3 by being woven simultaneously when the fastener tapes 3 are woven. The synthetic resin composite film 4 composed of the low-melting-point resin layer 12 and the high-melting-point resin layer 13 is fused to the rear surface of the fastener tape 3 so that it can protrude out of the side edge 11 of the fastener tape 3. Meanwhile, the loop-shaped linear elements 5 may be attached to the side edges 11 by knitting, and the synthetic resin composite film 4 is fused to the rear surface of the fastener tape 3.

As shown in fig. 17, in the fastener stringer 1 of the fifth embodiment, a bulged core portion 7a is formed on the side edge 11 of the fastener tape 3, and a metal individual element 5 is attached to the core portion 7a by folding over. A synthetic resin composite film 4 composed of a low-melting-point resin layer 12 and a high-melting-point resin layer 13 is fused to the rear surface of the fastener tape 3 so that it can protrude from the respective side edges 11 of a pair of fastener tapes 3. The synthetic resin composite film 4 fused to each fastener tape 3 is fitted to each other between the side edges 11. This allows the synthetic resin made individual sprocket to be directly mounted to the core 7a by an injection molding apparatus.

Fig. 18 shows a modification of the synthetic resin composite film 4. According to this synthetic resin composite film 4, in addition to the low melting point resin layer 12 and the high melting point resin layer 13, a synthetic resin layer 20 is provided on the surface of the high melting point resin layer 13. In this synthetic resin composite film 4, for example, the melting point of the low-melting resin layer 12 is 100 to 150 ℃, the melting point of the high-melting resin layer 13 is 150 to 200 ℃, and the melting point of the synthetic resin layer 20 is 200 to 220 ℃. The synthetic resin layer 20 may be appropriately provided according to the application of the fastener stringer. The synthetic resin layer 20 may have a melting point higher than 220 c and have a surface having an uneven pattern or a fabric pattern or have an ultraviolet protection function by embossing or the like.

The waterproof slide fastener of the invention and the method of manufacturing the same have been described above, and the following effects can be obtained.

According to the present invention, the synthetic resin composite film 4 composed of the low melting point resin layer 12 and the high melting point resin layer 13 is fused to at least one surface of the fastener tape 3 of the slide fastener so that the low melting point resin layer 12 is in surface contact with and opposed to the fastener tape 3 while the fastener elements 5 are mounted on the side edge 11 of the fastener tape 3. Therefore, the synthetic resin composite film 4 can be firmly fused to the fastener tape 3 to impart a waterproof function to the fastener tape 3, and occurrence of a synthetic resin film, that is, a perforation phenomenon, which does not exist at one partial portion due to heating of the surface of the synthetic resin film or due to the penetration of sewing thread can be prevented. Thus, a slide fastener having a good appearance can be obtained.

According to the present invention, the melting points of the low-melting-point resin layer 12 and the high-melting-point resin layer 13 are explained in detail. Therefore, the synthetic resin composite film 4 is not pierced from the fastener tape 3 at the time of dry cleaning, and can be fused to the fastener stringer reliably and conveniently.

According to the present invention, the synthetic resin composite film 4 fused to the fastener tape 3 is formed to protrude from the coupling midpoint of the side edge 11 of the fastener tape 3 and the element 5. Therefore, a waterproof function can be obtained at the side edges 11 where the left and right fastener tapes 3 are mated with each other by a simple structure.

According to the present invention, the fastener elements 5 are mounted on the front surface of the side edge 11 of the fastener tape 3, and the synthetic resin composite film 4 is fused on the rear surface of the fastener tape 3. Therefore, it is possible to provide a slide fastener in which the slide fastener is mounted on the rear surface thereof and has a waterproof function with a simple structure.

According to the present invention, the synthetic resin composite film 4 is fused to the front surface of the fastener tape 3, and the elements 5 are attached to the front surface of the side edge 11 of the fastener tape 3. Thus, it is possible to provide a fastener stringer 1 in which a slide fastener is mounted on a front surface thereof and which can have a waterproof function with a simple structure.

According to the present invention, the synthetic resin composite film 4 is fused to the front surface of the fastener tape 3, the linear elements 5 are sewn to the front of the side edges 11 of the fastener tape 3, and the rear surface portion to which the elements 5 are sewn is subjected to a water-repellent finish treatment. Therefore, water leakage or water penetration (in which the slide fastener is installed with its front surface) along the sewing line 6 for fixing the element 5 to the fastener stringer 1 can be prevented to enhance the waterproof effect.

According to the present invention, the synthetic resin composite film 4 is fused on the front surface of the fastener tape 3, the linear fastener elements 5 are sewn on the front surface of the side edge 11 of the fastener tape 3, and the sewing thread 6 for pulling the fastener elements 5 is subjected to a water-repellent finish treatment. Therefore, water leakage or water seepage (in which the slide fastener is surface-mounted in front) along the portion of the sewing yarn 6 for fixing the fastener elements 5 to the fastener stringer 1 can be reliably and conveniently prevented by changing the sewing thread to enhance the waterproof effect.

According to the present invention, a synthetic resin composite film 4 is fused to the surface of a fastener tape 3, a pair of straight elements 5 are provided on the surface so that they oppose their mutually opposing mating heads at a predetermined interval, and the fastener tape 3 is bent at the midpoint between the pair of straight elements 5 so that the bent portions overlap while the overlapped surfaces of the fastener tape 3 are bent to each other. Therefore, this slide fastener has the elements 5 on both surfaces of the fastener tape 3. This reliably prevents water leakage or water penetration on the side edges 11 of the fastener stringers 2 that are engaged with each other with a simple structure, and thus can ensure airtightness and watertightness.

According to the present invention, the elements 5 are mounted on the surfaces of the respective side edges 11 of the respective pairs of fastener tapes 3; the left and right straight elements 5 are engaged with each other, and then the synthetic resin composite film 4 composed of the low melting point resin layer 12 and the high melting point resin layer 13 is heated under pressure to be fused to the respective rear surfaces of the combined fastener tapes while the low melting point resin layer 12 is in contact with and opposed to the fastener tape 3 to fuse the low melting point resin layer 12 to the fastener tape 3; the synthetic resin composite film 4 between the left and right fastener tapes 3 is cut to make a fastener stringer 1. Therefore, a waterproof effect can be provided to the fastener tape 3, and a portion where the synthetic resin film is not locally present due to fusion by heating the synthetic resin film is not present, and a perforation phenomenon can be prevented. In addition, the synthetic resin composite film 4 can be fused to the fastener tape 3 reliably, so that a fastener tape having a good appearance can be produced by a simple manufacturing process.

According to the present invention, after the left and right fastener elements 5 attached to the fastener tape 3 are engaged, the fastener chain maintains a gap between the side edges 11 of the fastener elements 5 by pulling the left and right fastener tapes 3 to the left and right or by designing the fastener elements in a mountain shape to protrude toward the fastener tape side, while the synthetic resin composite film 4 is fused to the fastener tape. Therefore, the waterproof function of the side edge 11 of the fastener tape 3 can be enhanced by a simple manufacturing process. That is, the effect of the present invention is quite remarkable.

Claims (11)

1. A waterproof slide fastener is characterized in that a synthetic resin composite film (4) composed of a low-melting-point resin layer (12) and a high-melting-point resin layer (13) is fused to at least one surface of a fastener tape (3) in the slide fastener, the low-melting-point resin layer (12) is in contact with and opposed to the surface of the fastener tape (3), and a fastener element (5) is attached to one side edge (11) of the fastener tape (3).

2. The waterproof slide fastener according to claim 1, wherein the synthetic resin composite film (4) is composed of a low-melting-point resin layer (12) having a melting point of 100 ℃ to 140 ℃ and a high-melting-point resin layer (13) having a melting point of 150 ℃ to 230 ℃.

3. The waterproof slide fastener according to claim 1, wherein the synthetic resin composite film (4) is composed of a low-melting-point resin layer (12) having a melting point of 110 ℃ to 130 ℃ and a high-melting-point resin layer (13) having a melting point of 160 ℃ to 200 ℃.

4. The waterproof slide fastener according to claim 1, wherein a synthetic resin composite film to be fused to the fastener tape (3) is formed to protrude from a mating midpoint of the side edge (11) of the fastener tape (3) and the element (5).

5. The waterproof slide fastener according to claim 1, wherein the element (5) is attached to a front surface of the side edge (11) of the fastener tape (3), and the synthetic resin composite film (4) is fused to a rear surface of the fastener tape (3).

6. The waterproof slide fastener according to claim 1, wherein the synthetic resin composite film (4) is fused to the front surface of the fastener tape (3), and the elements (5) are attached to the front surface of the side edges (11) of the fastener tape (3).

7. The waterproof slide fastener according to claim 6, wherein the synthetic resin composite film (4) is fused to the front surface of the fastener tape (3), the linear-shaped fastener elements (5) are sewn to the front surface of the side edges (11) of the fastener tape (3), and the rear surface portion of the fastener tape (3) to which the fastener elements (5) are sewn is subjected to a waterproof finish treatment.

8. The waterproof slide fastener according to claim 6, wherein the synthetic resin composite film (4) is fused to the front surface of the fastener tape (3), the straight fastener elements (5) are sewn to the front surface of the side edges (11) of the fastener tape (3), and the sewing thread (6) for fixing the fastener elements (5) is subjected to a waterproof finish treatment.

9. The waterproof slide fastener according to claim 1, wherein a synthetic resin composite film (4) is fused to a front surface of the fastener tape (3), a pair of straight elements (5) are disposed on the front surface so that they are opposed, and the fitting heads (14) are opposed to each other across a predetermined interval, the fastener tape (3) is bent at a midpoint of the pair of straight elements (5) to overlap while overlapping surfaces of the fastener tape (3) are bonded to each other.

10. A method for manufacturing a waterproof slide fastener is characterized in that,

attaching a fastener element (5) to a front surface of each side edge (11) of a pair of fastener tapes (3);

after the left and right fastener elements (5) are engaged, heating a synthetic resin composite film (4) composed of a low-melting-point resin layer (12) and a high-melting-point resin layer (13) under pressure to fuse to the respective rear surfaces of the pair of combined fastener tapes (3), and the low-melting-point resin layer (12) is brought into contact with and opposed to the fastener tape (3) to fuse the low-melting-point resin film (12) to the fastener tape (3); and

the synthetic resin composite film (4) between the left and right fastener tapes (3) is cut to make a fastener stringer (1).

11. The waterproof slide fastener manufacturing method according to claim 10, wherein after the left and right fastener elements (5) attached to the pair of fastener tapes (3) are mated, the fastener elements (5) are maintained at a gap between the opposite side edges (11) thereof while the synthetic resin composite film (4) is fused to the fastener tapes (3) by pulling the left and right fastener tapes (3) leftward and rightward or designing the fastener elements (5) into a mountain shape to project sideward of the fastener tapes (3).