JPH04309303A - Production of waterproof uppers of shoes - Google Patents

Abstract

PURPOSE:To prevent the infiltration of water from seams into shoes by sticking a front cloth and a back cloth to each other with an unvulcanized rubber compd. contg. a foaming agent to obtain an uppers material, butting the end edges of this uppers material against each other and sewing the material with yarn subjected to a surface treatment with a thermoplastic resin and subjecting the compd. to hot air vulcanization. CONSTITUTION:The rear surface of the front cloth (synthetic leather having no surface skin or having a backskin-like tone) and the rear surface of the back cloth (acrylic boa) are respectively/subjected to one-side lining with latex. The unvulcanized rubber compd. obtd. from natural rubber and styrene/butadiene copolymer rubber, etc., is stuck onto the surfaces of the front cloth and rear cloth subjected to the latex treatment by simultaneous topping with a calender machine. The front cloth varying in color tones is used and this front cloth and the back cloth are stuck to each other by the same method. Two kinds of such uppers materials are cut and the end edges are butted against each other and are sewn by the polyester yarn coated with a polyamide resin of 80 deg.C m.p., by which the uppers are obtd. Such uppers are mounted on a shoes last, and an unvulcanized outer sole, etc., are mounted thereon and are subjected to hot air vulcanization in an indirect vulcanization vessel kept at 130 deg.C, by which the infiltration of the water from the seams is prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing waterproof shoe coverings.

0002

[Prior Art] In order to make shoe covers waterproof, an unvulcanized rubber member is attached to the surface of a lining fabric attached to a shoe last, such as in rubber boots, and hot air vulcanization is performed, or A method has been adopted in which an unvulcanized rubber member is attached to the surface of a lining fabric attached to a shoe last, and further an unvulcanized rubber member having decorative elements is attached at desired locations and hot air vulcanization is performed.

0003

[Problems to be Solved by the Invention] The shoe coverings obtained by the above-mentioned method have a relatively monotonous appearance and cannot actively stimulate consumers' desire to purchase them. Therefore, in an attempt to eliminate the monotony of the appearance of the sash, methods have been considered to manufacture the sash by sewing pieces of sash that have decorative elements together, or to sew decorative pieces on the surface of the sash. There are gaps between the threads used for sewing and the lace material, or between the threads and the decorative pieces, and when worn during rain, water seeps through the gaps, significantly impairing the comfort of the shoe.

[0004] In view of the above-mentioned circumstances, the present invention has been developed by filling the gaps between the thread and the decorative piece after sewing, and the gaps between the thread and the decorative piece, with rubber or thermoplastic resin, thereby reducing the amount of water inside the shoe. This is an attempt to prevent flooding.

[0005]

[Means for Solving the Problems] The present invention involves laminating a front fabric and a lining fabric using an unvulcanized rubber compound containing a foaming agent to obtain a woven material, abutting the edges of a predetermined woven material, and heating the The first gist of this is a method for manufacturing waterproof shoe covers, which is characterized by sewing with thread surface-treated with plastic resin and vulcanizing in hot air. Laminate with an unvulcanized rubber compound to obtain a cover material, butt the edges of the specified cover material,
The product is sewn with a thread whose surface has been treated with a thermoplastic resin, a waterproof tape with a thermoplastic resin layer is applied to one predetermined side of the sewn part, and the product is sewn with a thread whose surface has been treated with a thermoplastic resin and is vulcanized in hot air. The second gist is a method for producing a waterproof shoe cover, which is characterized by the following, and the first gist is characterized by the fact that a foaming agent is added to the thermoplastic resin used to surface-treat the yarn. Alternatively, the method for manufacturing waterproof shoe coverings as stated in the second gist is the third gist.

[0006] The thermoplastic resin preferably has a melting point of 90°C to 120°C, taking into account the vulcanization conditions, such as polyamide, polyester, ethylene-vinyl acetate copolymer, polyurethane, and ethylene-ethyl-acrylate copolymer. . The thread used for sewing may have its entire surface completely covered with the thermoplastic resin, or may have a shape in which the surface is wound like a helical spring, or may have an effect It is preferable to add a foaming agent to the thermoplastic resin in order to further accelerate the process.

[0007]

[Action] The unvulcanized rubber compound used to bond the outer fabric and the lining fabric contains a foaming agent, so it expands during the vulcanization process and invades the voids created around the threads after sewing. However, most of the voids can be filled, and since the periphery of the thread is coated with thermoplastic resin, it is cast during the vulcanization process and becomes integrated with the expanded rubber, helping to fill the voids. can. This function can be further ensured by adding a foaming agent to the thermoplastic resin coated around the yarn.

[0008]

[Example 1] Outer fabric (nubuck-like synthetic leather without outer skin)
Latex (natural rubber latex/styrene-butadiene copolymer rubber latex = 50/50) is coated on one side of the back side and the back side of the lining fabric (acrylic boa). natural rubber
70 Parts by weight Styrene-butadiene copolymer rubber 30 Zinc white
5
〃stearic acid
1 Sulfur yellow
2
〃Heavy calcium carbonate
50 OBSH foaming agent
3 Urea compound

The unvulcanized rubber compound obtained at the weight ratio of 3 parts by weight was simultaneously applied to the latex-treated surfaces of the outer fabric and the inner fabric using an inverted L4 calender and bonded together. On the other hand, using an outer fabric having a different color tone from the outer fabric,
The outer fabric and lining fabric were attached using the exact same method. Cut these two types of sheathing materials into a predetermined shape, butt the edges together, and the melting point is 8.
The jacket was sewn using polyester threads whose entire surface was covered with polyamide resin at 0°C. This shoe cover was applied to a shoe last, an unvulcanized outer sole was attached along with the inner sole, inner core, etc., and the mixture was placed in an indirect vulcanizer at 130°C (air pressure 2.5 kg/cm2) for 60 minutes and heated in hot air. I did sulfur. When the shoes thus obtained were worn in the rain, no water leaked through the seams.

[0009]

[Example 2] A decorative piece (with a layer of ethylene/vinyl acetate copolymer (thickness: 40 microns) with a melting point of 90°C) layered on the underside of the seam of the jacket before hot air vulcanization used in Example 1. (Nubuck-like synthetic leather) is sewn with the thread used in Example 1. The thus obtained shoe cover was applied to a shoe last, an unvulcanized outer sole was attached together with the inner sole, inner core, etc., and the mixture was placed in an indirect vulcanizing can at 130°C (air pressure 2.5 kg/cm2). It was placed for 60 minutes and hot air vulcanization was performed. When the shoes thus obtained were worn in the rain, no water leaked through the seams.

0010

[Effect] By implementing the present invention, even if decorative pieces etc. are sewn onto the shoe cover to improve the design etc., or even if the shoe cover materials are sewn together, water will not enter the shoe through the seams. Could get shoes that don't.

Claims (3)

[Claims] Claim 1: The outer fabric and the lining fabric are bonded together using an unvulcanized rubber compound containing a foaming agent to obtain a woven material, the edges of the specified woven material are butted together, and a thread surface-treated with a thermoplastic resin is used. sewn,
A method for producing waterproof shoe coverings characterized by hot air vulcanization. Claim 2: The outer fabric and the lining fabric are bonded together using an unvulcanized rubber compound containing a foaming agent to obtain a woven material, the edges of the specified woven material are butted together, and a thread surface-treated with a thermoplastic resin is used. sewn,
Manufacture of a waterproof shoe cover, characterized by applying a waterproof tape having a thermoplastic resin layer to one predetermined surface of the sewn part, sewing with thread surface treated with thermoplastic resin, and curing in hot air. Law. [Claim 3] Claim 1 or 2, characterized in that a foaming agent is added to the thermoplastic resin with which the thread is surface-treated.
A method of manufacturing the waterproof shoe cover described.