JPS6220293B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing a polyamide filament fabric. Conventionally, polyamide filament fabrics have been produced by preparing several hundred drawn yarns into a creel and performing so-called slusher sizing to warp them with glue, or by using a direct warper to warp them without sizing. It has been rolled up onto beams and then woven using various looms. Among these, plain-weave taffeta was the most commonly woven variety and was the most versatile. Therefore, technically speaking, this technology has almost been completed, and the important issue now is how to simplify the process and manufacture it at low cost without degrading the quality. From this point of view, in order to reduce the cost of the supplied yarn, the present inventor has considered shipping the yarn in an unstretched state by omitting the stretching process during manufacturing, and applying a draft during warping, and has developed the present invention. It has been reached. In other words, a highly oriented undrawn yarn with a birefringence △n of 0.035 to 0.045 is used as the supplied yarn, and in the conventional slushier sizing process, it is heated at 80°C to 80°C without applying glue.
The present invention is achieved by warping at a temperature of 200° C. with a draft of 5% or more, and by weaving using the obtained beams. Such a feed yarn can be easily obtained, for example, by using a spinning speed of 3,000 to 6,000 m/min in a normal melt spinning process, and if the obtained undrawn yarn is directly used as a feed yarn, the process can be streamlined and production volume increased. In addition, it is possible to make large packages weighing more than 10 kg, and a significant cost reduction can be expected. However, the problem here is that the quality of the product deteriorates due to changes over time in the undrawn yarn, which is more unstable than the drawn yarn. The inventor conducted further detailed study on this point and found that the birefringence △n
It was confirmed that yarns exceeding 0.035 have extremely stable packaging, and have little change in dyeability and do not affect the product. Moreover, they have discovered that by heat-treating the yarn, the dimensional stability is improved and the uniformity of the dyeability is further improved. In this case, it is desirable that the heat treatment temperature be as high as possible, 80°C or higher; however, if it exceeds 200°C, it is not preferable because it may damage the yarn or make the product rough and hard. The heating method is most preferably around 90 to 180°C, and the heating method may be either a contact method using a hot plate, a heat roller, etc., a non-contact method such as a thermal oven or hot air, or a combination of both. Furthermore, while performing this heating, 5%
The above draft is applied to improve the dimensional stability of the yarn, and as △n becomes lower than 0.045, it is necessary to increase the draft rate, and it is necessary to increase the draft rate to a maximum of about 40%. Become. If this is heat-treated in a draft or overfeed state of less than 5%, the dimensional stability of the product will be poor and only products with significantly inferior product value will be obtained. Also, when heat treating this thread,
A suitable water bath is provided in front of the device that feeds the yarn, and the yarn is passed through the water bath to impart sufficient moisture and then squeezed uniformly, followed by heat treatment. This is an effective means to equalize the temperature. In this case, the water bath may be at room temperature, but it is also preferable to set the water bath at an appropriate temperature in consideration of seasonal factors. The various points in carrying out the present invention have been explained above.
If the conditions of the present invention are applied to the above-mentioned products, the resulting product will only be of low quality with extremely many transverse defects such as so-called transverse muscles, and PVA
It should be noted that it is not preferable to apply glue such as this because it causes frequent problems such as glue removal during weaving. The polyamide filaments applied to the present invention are nylon 6 and nylon 66, or copolymerized polyamide filaments containing these as main components. Of course, it may also contain titanium, pigment, antistatic agent, etc. Further, the cross-sectional shape of the filament is not limited to a circular shape, and may be a filament having various irregular cross-sectional shapes such as a trilobal shape. Note that the warping device for carrying out the present invention may be a warping slasher sizing machine that has been used conventionally, but in order to improve the uniformity of the tension of the yarn, it is necessary to use a warping device such as a feed roller. It is preferable to increase the contact pressure or reinforce the gripping part. Next, the present invention will be explained with reference to examples, but the present invention is not limited thereto. Example 1 Nylon 6 with intrinsic viscosity [η] = 1.0 at a temperature of 280°C
Melt-spun using a 16-hole spinneret, 4000m/
I picked it up at min. The obtained undrawn yarn has a birefringence △n of 0.043, a fineness of 72 denier, and a strength of 5.1 g/d.
The elongation was 75%. 1200 of these undrawn yarns were put on a creel and passed through a Tsudakoma G-type warping slasher sizing machine at 120 m/s under draft conditions at four different temperatures (No. 1 to 4) shown in Table 1. Warping was carried out at a yarn speed of min.

[Table] The obtained sizing beams were collected and beamed, and the beams with a total of 4,320 warp threads were woven in a Nissan water jet loom to obtain nylon taffeta. Warpability and weavability were good for Nos. 1 to 4, and there were no problems. However, dyeing was performed on these, and the generation of warps and texture were determined using taffeta of the same standard (blank) made from ordinary drawn yarn. ) As shown in Table 2, the methods of the present invention (Nos. 1 and 2) were very good.

[Table] ○: Good, ×: No commercial value

Claims (1)

[Claims] 1 When warping the warp of a fabric using a polyamide filament with a birefringence index △n of 0.035 to 0.045, at least 5 at a temperature of 80°C to 200°C.
80℃~200℃ after warping with a draft of % or more or after adding sufficient moisture in advance.
1. A method for producing a polyamide filament woven fabric, which comprises warping the fabric at a temperature of at least 5% or more at a temperature of 0.degree.