JPS6139421B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing shrunken fabrics. More specifically, the present invention relates to a method for producing a shrunken fabric made of yarn-dyed thermoplastic synthetic fiber yarns, particularly polyester synthetic fiber yarns. Conventionally, the method for producing shrink fabrics by yarn dyeing using thermoplastic synthetic fiber yarn has been to use a yarn obtained by pre-mixing polymers and dyes during the production of raw yarn to provide strong anti-kink properties. A common manufacturing method is to apply However, with this method, manufacturing small quantities of dyed yarn in multiple colors involves problems such as the manufacturing process, number of colors, and cost, so it is rarely actually manufactured for use in shrinkage fabrics. is the current situation. In addition, there is a method of applying a sweet twist to the raw yarn and making the yarn into a skein shape and dyeing it, or a method of winding the sweet twist yarn with a low hardness around cheese or corn and dyeing it. However, yarns dyed in a combed manner suffer from excessive shrinkage, making it impossible to obtain a satisfactory texture. On the other hand, when dyeing a cheese or cone shape, it has usually been impossible to obtain a stable yarn-dyed yarn due to uneven shrinkage within the cheese or cone. The inventors of the present invention have conducted intensive studies with the aim of developing a new method for producing shrunken fabrics by yarn dyeing that eliminates the drawbacks of the conventional method, and as a result, they have arrived at the method of the present invention. That is, in the method for producing a yarn-dyed shrink fabric of the present invention, the polyester synthetic fiber yarn is heat-treated under tension within a temperature range of 20°C lower to 30°C higher than the dyeing temperature before dyeing. After that, the yarn is dyed in a cheese or cone shape, and the dyed yarn is further subjected to a strong twist-preventing treatment, and the obtained yarn is woven using the yarn, and then subjected to a texture treatment. This is a method for producing yarn-dyed shrink fabric. The method of the present invention will be explained in more detail below. The method for producing a shrunken fabric of the present invention involves heat-treating polyester synthetic fiber threads under tension before dyeing them, winding the threads around cheese or corn, dyeing them, and strongly preventing twisting. The yarns are arbitrarily arranged and woven. The woven gray fabric is then subjected to pot-setting and finishing processing to achieve excellent pot quality.
A yarn-dyed shrink fabric made of polyester fibers having a texture is obtained. In the method of the present invention, before dyeing cheese or corn, the dyeing temperature is 30°C lower than the dyeing temperature.
By heat-treating the yarn under tension within a high temperature range of 0.degree. C., the Young's modulus of the yarn after dyeing is not significantly different from that before the tension treatment. In particular, a temperature range from the same temperature as the dyeing temperature to a temperature 20°C higher is the most desirable treatment temperature because of its great effect. When heat treatment is performed under tension at a temperature 20°C or more lower than the dyeing temperature, the shrinkage unevenness of the inner and outer layers of cheese and corn becomes large, resulting in color differences in dyeing and a large difference in Young's modulus, which is undesirable. In addition, if heat treatment is performed under tension at a temperature 30°C or more higher than the dyeing temperature, problems such as a decrease in the amount of dyeing during the dyeing process may occur.
This is undesirable because it causes problems such as extremely reduced graininess after hanging the cloth. Note that the treatment temperature in the present invention is, of course, the temperature at which the yarn is actually treated, for example, 50°C lower than the dyeing temperature.
Even when processing equipment is set to high temperatures,
The actual temperature of the yarn may be lower than the dyeing temperature due to short-term processing, etc.
If it falls within the range of 30°C higher, it is included in the present invention. In the method of the present invention, pre-heat treatment is performed under tension in order to reduce thermal effects (shrinkage or shrinkage dyeing unevenness) during dyeing. This is because the shrunk yarn has high elongation and absorbs the strain of the strong yarn by stretching, and during the subsequent graining process, the torque is small and the graining is less likely to occur. Table 1 shows the tension heat treatment temperature and dyeing temperature confirmed by the inventors, as well as the stress at 5% elongation of the dyed yarn obtained by the dyeing, and the wrinkle shrinkage rate.
An example of the relationship with grain texture is shown.

[Table] As can be seen from Table 1, yarns with a stress of 1.2 g/d at 5% elongation, that is, yarns whose heat treatment temperature under tension is 30°C or more lower than the dyeing temperature, are not wrinkled. The shrinkage rate is extremely low, and there are almost no visible wrinkles. This is because the Young's modulus decreases due to dyeing, so the strain (resolved torque) applied during the application of strong elasticity is absorbed by the area where the Young's modulus is lowered, and becomes loosened torque during graining, and no shrinkage force is generated. be. In addition, yarns with a stress of 1.6 g/d or more at an elongation of 5%, that is, yarns whose tension heat treatment temperature ranges from 20°C lower to 30°C higher than the dyeing temperature, have a large grain shrinkage rate, The quality is also good. This is the opposite of the case described above, when the strain applied to the yarn during the application of strong texture is partially absorbed when the dyeing temperature is higher than the tension heat treatment temperature, the residual unraveling torque is generated during graining. This is due to the shrinkage force that results in a good grain.
In addition, if the tension heat treatment temperature is higher than the dyeing temperature, the strain during the application of strong texture is not absorbed and is entirely generated as loosening torque during graining. As described above, according to the method of the present invention, a shrunken fabric made of yarn-dyed yarns of good quality can be obtained stably. The effect of improving grain appearance based on the pre-heat treatment described above is most noticeable when polyester synthetic fibers are used, and the effect of the present invention is poor even if the method of the present invention is applied to other than polyester synthetic fibers. It is something. Furthermore, according to the present invention, by appropriately setting the heat treatment conditions in the tension state before dyeing and the dyeing temperature,
Because of the different grain shrinkage and grain quality, it is possible to produce a wide yarn-dyed shrink fabric, which is of extremely great industrial value. Examples will be described below. Example Polyester synthetic fiber yarn 75D-36f was stretched at 150 T/M using a double twister, and the stretched yarn was heat-treated under tension using a vacuum setter at 110° C. for 40 minutes. After that, the cheese is rolled back into the cheese for the cheese dyeing machine (120℃×
Staining was performed for 120 minutes). 2300T/ for the dyed yarn
Apply M strong glue and use a vacuum setter to prevent twisting.
The process was carried out at 85℃ for 40 minutes, and the strong cotton yarn was
A willow crepe was woven using two alternating Z twists and only an S twist in the horizontal direction. When the greige was grained using a high-pressure washer graining machine at 110°C, a good grain quality and hand was obtained that was not much different from post-dyed Ageryu crepe.

Claims (1)

[Claims] 1. Before dyeing, the polyester synthetic fiber yarn is heat-treated under tension within a temperature range of 20°C lower to 30°C higher than the dyeing temperature, and then
The yarn is dyed in a cheese or cone shape, and the dyed yarn is further subjected to a strong twist-preventing treatment, and the yarn obtained is woven using the yarn, and then embossed. Method for manufacturing dyed shrink fabric.