JPS61160418A - Heat-treatment of tow of nylon 6 fiber - Google Patents

Abstract

PURPOSE:To produce uncrimped staple fiber dyeable without causing three- dimensional crimping and useful as a fur-like fiber, with a simple apparatus, by drawing a nylon 6 fiber tow, and subjecting to the hot-water treatment and steam treatment under specific condition. CONSTITUTION:A nylon fiber tow T is drawn, relaxed between the drawing roller 2 and the first take-up roller 4 at a relaxation ratio of 10-20%, and treated with hot water in a hot water bath 3 at 80-100 deg.C for >=0.2sec. The treated fiber tow is stretched between the first take-up roller 4 and the second take-up roller 6 at a stretching ratio of -1-+5%, treated with steam at a temperature between 100 deg.C and the softening point for >=0.1sec, dried, and cut to obtain the objective uncrimped stape fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for heat treating nylon 6 fiber tow, which can produce nylon 6 non-crimped staples used as animal hair-like fibers.

<Prior art> Animal hair-like nylon 6ta fibers can be used with crimped staples, non-crimped staples, with irregular cross-sections such as circular to triangular cross-sections, and with titanium oxide added to improve gloss. Various types of staples have been used, including those containing crimped staples, but among these, crimped staples are one of the most preferred.

However, non-crimped staples have a drawback in that the single yarns exhibit a three-dimensional crimped form after dyeing. In order to eliminate this drawback, there are a method of stretching, a method of hot water treatment after stretching, and a method of once producing a crimped stable.

A number of methods have been proposed to heat this with water vapor using a batch steam center.

<Problems to be Solved by the Invention> However, the former drawing method and heat treatment method have not been able to sufficiently eliminate the occurrence of three-dimensional crimp, and the latter method of heat setting with steam has not been able to sufficiently eliminate three-dimensional crimp. Although this can be prevented from occurring, it has disadvantages in that large-scale equipment for heat setting is required, productivity is reduced, and product costs are inevitably increased.

Means for Solving the Problems> The present inventors analyzed the mechanism of the occurrence of the above-mentioned three-dimensional crimp, and found that the three-dimensional crimp is due to latent strain in the fiber axis direction that occurs during stretching. was investigated.

Based on the above findings, the present inventors have continued to conduct various studies on heat treatment methods for nylon 6 fiber tows that do not cause three-dimensional crimp due to latent strain.

The inventors have discovered that by heat-treating stretched nylon 6 fiber tow under specific conditions, it is possible to obtain a crimped-free staple that does not cause three-dimensional crimp during dyeing, and has thus arrived at the present invention.

That is, in the present invention, when a nylon 6 fiber tow is drawn and subsequently heat treated, the drawn nylon 6 fiber tow is subjected to hot water treatment at a relaxation rate of 10 to 20% and a temperature of 80 to 100°C for 0.2 seconds or more, and then It is characterized by performing a steam treatment for 0.1 seconds or more at a tension rate of -1 to 5% and a temperature of 100° C. or more and below the softening point.

The nylon 6 fiber tow in the method of the present invention is obtained by polymerizing ε-caprolactam by a known method.

This polymer is obtained by making a stubble, scouring it with hot water, drying it, and aligning the melt-spun undrawn yarn.

In the method of the present invention, the nylon 6 fiber tow is first stretched, and then at a relaxation rate of 10 to 20% and a temperature of 80 to 100%.
Treat with hot water at ℃ for 0.2 seconds or more. Here, the relaxation rate is expressed as a percentage of the difference between the peripheral speed of the (final) stretching roller group and the peripheral speed of the first take-up roller group to the peripheral speed of the stretching roller group. In this case, if the relaxation rate is less than 10%, the latent strain of the fiber tow cannot be eliminated;
%, it is not preferable because the single yarn of the tow after drawing will often wind up around the final roller of the drawing roller group, causing trouble.

Further, the treatment temperature in the hot water treatment is 80 to 100°C, and if the treatment temperature is less than 80°C, the effect will be insufficient and crimp of the three-dimensional structure will occur due to latent strain, which is not preferable. The hot water treatment must be performed for 0.2 seconds or more; if the treatment time is less than 0.2 seconds, three-dimensional crimp will occur during the dyeing treatment.

Note that the stretching performed prior to the hot water treatment is preferably performed at a temperature below the hot water treatment temperature, particularly cold stretching, from the viewpoint of the heat treatment effect.

The tow treated with hot water as described above is then further treated with a tension ratio of -1 to 5% and a temperature of 100°C or more and below the softening point of 0.
Steam treated for L seconds or more. Here, the tension ratio is expressed as a percentage of the difference between the circumferential speed of the second take-off roller group and the circumferential speed of the first take-up roller group to the circumferential speed of the first take-off roller group.

It is necessary to perform this steam treatment at a tension ratio of -1 to 5%, and when the tension ratio is less than 11%, the single yarn of the tow is wound around the final roller of the first take-up roller group.

On the other hand, if the tension rate exceeds 5%, the latent strain will be added again to the tow whose latent strain has been reduced, and the latent strain will not be eliminated, which is not preferable. If the temperature is below ℃, the latent strain will not be eliminated, and if it exceeds the softening point, the effect commensurate with the temperature increase will not be seen, and it will be uneconomical from the point of view of energy conservation, so the steam treatment temperature should be 100 to 160℃. preferable. The treatment time of this steam treatment must be 0.1 seconds or more; if it is less than 0.1 seconds, three-dimensional crimp will occur after the dyeing treatment, as in the case of the hot water treatment described above. .

The tow heat-treated in two steps, hot water treatment and steam treatment, is dried according to a known method and then cut into predetermined lengths to produce animal hair-like crimped stable.

FIG. 1 is a process schematic diagram showing one embodiment of the present invention, in which a nylon 6 fiber tow (T) is sent out at a constant speed by a roller of a supply roller group (1),
It is stretched at a predetermined stretching ratio by the supply roller group (1) and the stretching roller group (2), and then relaxed by 10 to 20% between the stretching roller group (2) and the first take-up roller group (4). 0.2 at 80-100℃ in hot water tank (3)
After being treated with hot water for more than seconds, the first take-up roller group (4) and the second take-up roller group (6) are brought into a state of tension of -1 to 5%, and heated to 100°C in a steam treatment tank (5). The above was steam treated for 0.1 seconds or more at a temperature below the softening point, and then dried in a dryer (7
), passes through a final take-up roller (8), and is cut by a cutter (9) into a crimped-free staple.

<Example> The present invention will be specifically described below based on examples.

Example A polymer obtained by polymerizing ε-caprolactam by a known method was once made into a slag, and then scoured with hot water.

The undrawn yarn obtained by melt-spinning by a conventional method was drawn to form a tow 1, which was then cold-stretched at a draw ratio of 4.0 to 45,000 d (single filament fineness 15 d) according to the process shown in Figure 1.
) was subjected to hot water treatment and steam treatment under various conditions, and after drying, it was cut into staples.

When the three-dimensional crimp of the obtained staple was evaluated based on the potential amount, the results shown in Table 1 were obtained.

For crimp evaluation, 50 staples were bundled and aligned, placed in a gauze cotton bag, treated with boiling water for 30 minutes, and air-dried at room temperature for 24 hours.

This was done using the value calculated using the following formula.

Xl However, ΣC: Total complement number of staples measured The number of crimps is the number of crimps when the sample is suspended under no load.

n; Number of measurements L Average cut length (cm) of varnish table The average cant length is the length under a load of 15 g.

Also, the evaluation of K in Table 1 is ◎ (K=O~4).

0 (K=5-10), △ (K=11-30).

Based on a 4-level evaluation of X (K>30).

Table 1 (4) The O mark in the sample fish is an example of the present invention, and the others are comparative examples.

As is clear from Table 1 (1) sample light according to the method of the present invention, 5 -
9, 11 to 12, 14 to 15, and 18, there was no occurrence of three-dimensional crimp due to the latent amount.

The evaluation of the K value was good, and it was suitable as an animal hair-like fiber.

In contrast to these, sample magnet 1 in which the steam treatment of the comparative example was omitted
The occurrence of three-dimensional crimp is large, and the evaluation of the value is poor.
In addition, although the steam treatment conditions are within the scope of the present invention, sample 11h2 whose hot water treatment conditions are outside the scope of the present invention and the hot water treatment conditions are within the scope of the present invention but the steam treatment conditions are outside the scope of the present invention. The evaluation of the value of sample 3, which is outside the range, is slightly poorer than that of the present invention, and the evaluation of the value of sample 4, which is outside the range of the present invention under both hot water treatment conditions and steam treatment conditions, is It was defective. In addition, sample tlh 10 has a hot water treatment time of 0.1 seconds, which is outside the scope of the present invention, and a water vapor treatment time of 0.1 seconds.
05 seconds and Sample No. 13, which is outside the scope of the present invention, both had poor evaluations. Furthermore, Sample Magnet 16, whose relaxation rate during hot water treatment was increased to be outside the range of the present invention, and Sample Fish 17 and Sample Magnet 19, whose strain rate during steam treatment was increased outside the range of the present invention, both had values. The evaluation was poor, and three-dimensional crimp occurred due to the latent amount.

<Effects of the Invention> As described above, the method of the present invention involves stretching a nylon 6 fiber tow, and subsequently subjecting the stretched tow to a two-step heat treatment of hot water treatment and steam treatment under specific conditions. This removes the latent amount in the fiber axis direction, making it possible to produce good quality animal hair-like fibers without three-dimensional crimp after dyeing. Moreover, the method of the present invention does not require large-scale equipment and does not reduce productivity, unlike the conventional method of using a batch-type steam setter for heat centrifugation, and therefore the product cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a process schematic diagram showing one embodiment of the method of the present invention. T - Fiber tow 1 - Supply roller group 2 - Stretching roller group 3 - Hot water tank 4... - First take-up roller group 5 - Steam treatment tank 6 - Second take-up roller group 7 - Dryer 8 -
Final take-up roller 9 - cutter

Claims (1)

[Claims] (1) When stretching the nylon 6 fiber tow and subsequently heat treating the stretched nylon 6 fiber tow, the relaxation rate of the stretched nylon 6 fiber tow is 10 to 2.
0%, hot water treatment for 0.2 seconds or longer at a temperature of 80 to 100°C, followed by steam treatment for 0.1 seconds or more at a tension rate of -1 to 5% and a temperature of 100°C or higher and below the softening point. Heat treatment method for nylon fiber tow.