JPH0159391B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a method for producing a coated fabric that has both good wrinkle quality and a uniform coating layer. (Prior Art) Wrinkling has conventionally been performed as one of the methods for imparting natural surface changes to fabrics containing thermoplastic synthetic fibers such as polyamide and polyester. Methods for adding wrinkles include: creating a texture using highly twisted yarn; applying pressure and heat using an embossing calendar or pleating device to create unevenness; jet dyeing machines, washers, tumble dryers, etc. A common method is to knead the dough to give it unevenness. In recent years, the fashion for such wrinkle shapes has been shifting from mild uneven wrinkles to strong wrinkles and sharp-angled wrinkles. On the other hand, coating processing is widely used as a method for obtaining effects such as sealing, improving texture, and changing the surface. As a coating process for clothing, thin coatings with a film thickness of 6 μm or less are common, but recently, thick coatings with a film thickness of 10 μm or more using microporous polyurethane resin films are also being actively used. There is. Combination processing of these wrinkle processing and coating processing is useful as a high value-added processing, but there are two methods that can be considered depending on which method is performed first. In other words, if the wrinkle processing is performed first, a sufficiently thick coating film will be formed on the concave parts of the fabric, but only a thin coating film will be formed on the convex parts, making it difficult to obtain a uniform coating film and impairing its functionality. This often results in a decrease in the quality of the coated surface and a decrease in the quality of the coating surface. Therefore, the reality is that it is limited to those that have low wrinkles and do not require a uniform coating film. In addition, if coating processing is performed first,
A uniform coating film can be formed. However, it is difficult to provide strong wrinkles or dense wrinkles due to the elasticity of the coating film. Further, problems such as damage to the coating film occur during the wrinkle forming process. (Problems to be Solved by the Invention) Therefore, with the above-mentioned prior art, it has not been possible to obtain a coating fabric that has strong wrinkles and a uniform coating film at the same time. With membrane-based moisture-permeable waterproof coatings (high water pressure resistance type with water pressure resistance of 2000 mm or more), strong wrinkles have not been obtained. The present invention solves these drawbacks by providing a coating film with strong wrinkles having an average wrinkle height of 100 to 500 μm and a uniform coating film with an average thickness of 10 to 50 μm (the average film thickness of the thinly coated portion is thicker). The purpose of the present invention is to produce a coated fabric having at the same time a coating film that is 1/3 or more of the average film thickness of the part. (Means for Solving the Problems) In the method of the present invention, when applying a resin coating to a wrinkled thermoplastic synthetic fiber fabric, the fabric is heated in a heating atmosphere of 110 to 180°C in the width direction and/or
A process of applying tension in the length direction or pressure in the thickness direction to make the surface flat; a process of coating with resin; a process of humidifying or swelling; and a process of heat setting. In other words, the wrinkle height of the fabric is reduced to 1/2 to 1/3 before the coating process to form a uniform coating film, and then a moisture absorption treatment is performed to recover the wrinkles. . The thermoplastic synthetic fiber fabric as used in the present invention refers to thermoplastic synthetic fibers such as polyamide and polyester, and fabrics containing 50% or more of these fibers.
Generally, it is a durable fabric that can be wrinkled. The wrinkles of the fabric as used in the present invention have a wrinkle height of 100 to 500 μm.
Preferably, 100 to 300 μm
The width of wrinkles is preferably 1 to 20 mm, more preferably 1 to 10 mm. The wrinkle height referred to here is
Place the fabric on a horizontal surface and apply 0.5 mm to an area of approximately 15 mm in diameter.
The thickness of the fabric is measured when pressures of g/cm ² and 50 g/cm ² are applied, and the difference between the two is calculated (correction is made for the decrease in thickness due to compression of the coating film and fabric). The width of the wrinkle is the convex part (or concave part)
Refers to the width of the Methods for applying wrinkles include, for example, creating texture using highly twisted yarn, applying pressure and heat using an embossing calendar or pleating device to create unevenness, jet dyeing machines, washers, tumble dryers, etc. You can use the method of kneading the dough to give it unevenness. In the present invention, coating resins include acrylic ester resins, polyamide resins, polyurethane resins, silicone resins, vinyl chloride resins,
There are amino acid resins, Hypalon, fluorocarbon resins, etc., and these resins can be used in any state such as emulsion, water or organic solvent solution. In addition, as a coating method, either dry coating or wet coating can be used, and coating methods such as floating knife coater, knife over roll coater, reverse roll coater, roll doctor coater, gravure roll coater, kiss roll coater, etc. are used. can. In the present invention, the wrinkle processing is performed first, and then the fabric is temporarily wrinkled to a wrinkle height of 1/2 to 1/2 to
1/3 and the surface is almost flat,
Examples of this method include applying tension to the fabric in the warp or weft, or both directions using a high-temperature material, and applying high temperature and pressure to the fabric using a shimmy calender or the like. In this case, if the temperature is too low, a flat fabric cannot be obtained and uniform coating cannot be achieved. Moreover, if it is too high, the fabric will be set in a flat state, resulting in insufficient recovery of wrinkles. Therefore, it is necessary to select a temperature in the range of 110 to 180° C. at which the fabric remains flat and is free from wrinkles. For example, 120 for polyamide fibers
~160℃, and 130~170℃ for polyester fibers. In the wrinkle recovery process, humidification or swelling treatment
The distortion caused by shrinkage of the fibers, shrinkage of the coating film, and disappearance of wrinkles in the previous process occurs, and the wrinkles are recovered. The humidification or swelling treatment mentioned here includes irradiation with water vapor using a steamer, etc., and application of water or an aqueous solution of a penetrating agent (isopropyl alcohol, methanol, acetone, etc.) by dipping, padding, spraying, etc. . The setting process is a process in which wrinkles are set by heat, and the temperature is preferably in the range of 150 to 180°C, and it is desirable to carry out the process under conditions that do not apply tension to the fabric as much as possible. In the present invention, processing methods such as water-repellent finishing or water-absorbing finishing can be used in combination. These treatments may be performed at any time except between the first step (wrinkle reduction step) and the second step (coating step). For example, in the process of padding with water or an aqueous penetrant solution to restore wrinkles, a water repellent can be added to the treatment bath to simultaneously perform a water repellent finish. Generally, for thick coatings with a coating thickness of 10 μm or more, sealing treatment is often performed in advance using thin coatings. In the present invention, this sealing treatment may be performed either before or after the first step (the step of obtaining a flat fabric). (Example) Example 1 Nylon 6 taffeta with warp 70 denier 18 filament, weft 70 denier 18 filament, warp density 112/inch, weft density 90/inch was given willow-like wrinkles using a jet dyeing machine. After dyeing, the carp was treated with a water-repellent water repellent. Subsequently, a polyurethane resin dimethylformamide solution was applied to one side of the fabric using a floating knife coater, immediately wet-coagulated, washed with hot water, dried, and heat-treated to perform sealing treatment. Next, a fabric with reduced wrinkles was obtained by applying tension in the width direction and length direction at a temperature of 140°C. The wrinkle height at this time was approximately 120 μm. Further, a polyurethane resin dimethylformamide solution was applied to the sealed surface of this fabric using a roll doctor coater, immediately wet-coagulated, and then washed in hot water. Subsequently, this coated fabric was padded with an aqueous solution containing a silicone water repellent and isopropyl alcohol, dried, and then heat set at a temperature of 160°C. Subsequently, the skin was padded with an aqueous isopropyl alcohol solution and dried to recover wrinkles. The functions of the above-mentioned coating fabric are shown in Table 1, and a uniform coating film (the thickness of the thinly coated part is about 34% of the thickness of the thickly coated part) and good wrinkles with a wrinkle height of about 190 μm were obtained. Ta. Also, the water resistance is 2660mm
It was in good condition with H ₂ O. Comparative Example 1 From the process of Example 1, the functions are as shown in Table 1 when the process of applying tension at a temperature of 140°C to reduce wrinkles and the process of recovering wrinkles by padding with an aqueous isopropyl alcohol solution are omitted. Both the wrinkle height (approximately 90 μm) and the uniformity of the coating film (the thickness of the thinly coated area was approximately 28% of that of the thickly coated area) were insufficient. Further, the water resistance of this coated fabric was 1930 mmH ₂ O, which was inferior to that of Example 1.

[Table] * In the example, after the process of reducing wrinkles Example 2 Polyester taffeta with warp 75 denier 36 filament, weft 75 denier 36 filament, warp density 120/inch, weft density 90/inch; Both weft and weft are made of 35% cotton, 65% polyester, 45 count thread, warp density 136/inch, weft density
Example 1 for two types of E/C fabrics with 72 pieces/inch
The same processing was applied. However, for polyester taffeta, the process of reducing wrinkles was carried out at 150°C. The functions of the above coated fabric are shown in Table 2, and a uniform coating film and good wrinkles were obtained, and the water resistance was also good.

[Table] (Effects of the Invention) As described above, according to the method of the present invention, a coated fabric having both strong wrinkles and a uniform coating film can be easily obtained, and such a coated fabric has a remarkable surface effect and a high It is waterproof and extremely useful.

Claims (1)

[Claims] 1. When resin coating is applied to a wrinkled thermoplastic synthetic fiber fabric, the fabric is coated in the width direction and/or in a heated atmosphere at 110 to 180°C.
A process of applying tension in the length direction or pressure in the thickness direction to make the surface flat; a process of coating with resin; a process of humidifying or swelling; and a process of heat setting. A method for manufacturing a coated fabric. 2 The average wrinkle height of synthetic fiber fabric is 100 to 500 μm
The method according to claim 1. 3. The method according to claim 1, wherein the synthetic fiber fabric is made of polyester or nylon. 4. The method according to claim 1, wherein the resin is a polyurethane resin. 5. The method according to claim 1, wherein the heat setting temperature is 150 to 180°C.