JPS5936708B2 - How to heat set fabric - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for heat setting fabrics made of polybutylene terephthalate fibers.

i.e., at least 8"0 mole percent of repeating structural units.
The present invention relates to a method for heat setting a fabric consisting mainly of fibers made of a synthetic polymer consisting of polymer chains of polybutylene terephthalate.

Fibers made of polybutylene terephthalate have been known for a long time, for example, in JP-A-48-31247.
．． 49-55920 etc., a specific method for spinning the fiber is shown.

However, among the various existing fibers, it is difficult to say that its value as a clothing fiber has been positively recognized.

We have recently focused on the value of polybutylene terephthalate fiber as a clothing fiber and have conducted detailed studies.

While proceeding with the advanced processing of fabrics made from fibers mainly made of polybutylene terephthalate, we encountered unexpected difficulties.

In other words, when heat-setting a fabric made of this fiber, the situation is quite different from the conventional heat-setting of fabrics made of synthetic fibers such as nylon and polyethylene terephthalate fibers, and it is difficult to heat-set properly using the same concept. I have come to discover that.

In other words, it was observed that under normal setting conditions, when the fabric was removed from the pin tenter, it contracted rapidly and was not set to the setting width.

For these reasons, we conducted a detailed study of practical heat setting conditions to make fiber fabrics mainly made of polybutylene terephthalate practically usable.
This led to the present invention.

That is, the present invention provides at least 8 repeating structural units.
A fabric mainly composed of fibers made of a polymer of which 0 mol% is polybutylene terephthalate is
When thermally setting the final finishing target width at 0 to 190°C, the set width setting rate defined below is set to 1.02 to 1.
08. A method for heat setting a fabric.

set width) Set width setting rate = □ Finishing goal @) It is.

(Here, the set width is the pin setting width of the pin tenter, and the finishing target width is the product standard finishing width.

) Hereinafter, the present invention will be explained in detail. The fabric referred to in the present invention is a fabric mainly composed of polybutylene terephthalate fibers, and may be mixed with other fibers (combined weaving, mixed knitting, blended spinning, etc.) within the range where the effects of the present invention are exerted. can not use.

In other words, some natural fibers such as wool and cotton, nylon,
There is no problem even if synthetic fibers such as polyethylene terephthalate are mixed in.

The polybutylene terephthalate fiber may of course be a polybutylene terephthalate fiber, but may also be copolymerized with up to 20 mol% of other chemical structural units based on the repeating structural units.

For example, as a dyeing sheet, a polymer copolymerized with several mol % of a sulfoisophthalic acid compound such as di(4-hydroxybutyl 5-sodium sulfoisophthalate) can be used.

Next, heat setting conditions will be explained.

When conventional synthetic fibers such as nylon and polyester fibers are heat-set under normal conditions, they are usually finished with a flat set width (pin setting width of a pin tenter).

However, in the case of the polybutylene terephthalate fiber fabric used in the present invention, when trying to heat set it at an appropriate temperature with a pin tenter, as mentioned above, when the fabric is removed from the pins, it immediately shrinks and the set width decreases. It cannot be fixed.

Moreover, surprisingly, this tendency becomes stronger as the temperature increases.

However, if the temperature is too low, there is no point in heat setting, and it is impossible to obtain a wrinkle-free and high-quality product.

Further, at high temperatures, hand-hardening is significant, so it is not possible to select a heat set temperature that is too high.

Therefore, the heat setting temperature in the present invention is 1
A temperature of 50 to 190°C, more preferably 160 to 180°C is selected.

In the range of 150 to 160℃, the product quality is slightly inferior,
There is a tendency for the product to shrink slightly when washed and ironed, and this is within the minimum allowable temperature range.

On the other hand, in the range of 180 to 190°C, the texture becomes a little hard, and from this point on, this is the maximum allowable temperature range.

At 160-180°C, virtually no texture hardening was observed,
Good product quality can be obtained.

However, as mentioned above, even when heat setting is performed in this temperature range of 150 to 190°C, preferably 160 to 180°C, the finished width will be smaller than the set width (pin@), and therefore the target product width will be smaller than the set width (pin @). To obtain this, it is necessary to set the set width in consideration of this contraction.

Now, the ratio to the set width (to the finishing target width (ie, finished width) of →) is defined as the set width setting ratio.

As can be seen from the above-mentioned phenomenon, the required set width setting rate differs depending on the set conditions.

That is, the setting temperature and width setting rate are determined based on the required texture, quality, and grain, and the set width setting rate is determined based on this.

Here, the tentering rate is a term commonly used by those skilled in the art, and is defined as follows.

FIG. 1 illustrates the set width setting ratio when taffeta (plain woven fabric) made of polybutylene terephthalate fibers is heat set at various temperatures and at various tentering ratios.

Detailed experimental conditions are shown in Examples.

As can be understood from the figure, the higher the set temperature, the larger the set width setting ratio, and the larger the tenting ratio, the larger the set width setting ratio. It becomes impractical to take the payout rate.

This is because setting the set width setting rate too high increases the error in the finished width.

The selection of this tentering rate has to be changed depending on the required texture and quality, and it is also quite different between woven and knitted fabrics, so it is difficult to make a general decision, but in general, As shown in FIG. 1, the tenting ratio is selected as a practical range of 0 to 6%.

In other words, if the tenting ratio exceeds 6%, the wrinkles of the fabric can be sufficiently removed, but due to excessive tension, the texture will be significantly impaired and it will even become flat, and if it is less than 0%, wrinkles will appear on the surface. It spoils the texture.

Further, the setting temperature does not need to be limited as long as it can be set, but it should normally be selected from the viewpoint of setting efficiency and texture, and in the case of the fabric of the present invention, it is 150 to 90℃.
is selected as the practical temperature range (the temperature range indicated by the dotted line in FIG. 1).

As can be understood from FIG. 1, the set width setting rate is 1.02 to 1 at such practical discharge rate and set temperature.
．． By setting it within the range of 0.08, it is possible to easily manage the finished width to the target.

As already mentioned, for ordinary polyester fibers (e.g. polyethylene terephthalate fibers), for nylon,
Depending on the temperature and in the normal tentering ratio range, there is almost no difference between the set width (pin width) and the finished target width (finished width), and in fact the ratio is close to 1.00, as shown in Figure 1. No such phenomenon is observed.

In other words, there was no need for a concept such as a set width setting ratio.

When applying the heat-setting method of the present invention to heat-setting a fabric made of polybutylene terephthalate fibers, it is possible to stably produce high-quality fabric products through practical high-level processing of the fiber fabric for use in clothing. can do.

Example 1 50 denier 24 made of polybutylene terephthalate
Filament for warp, 75 denier 36 filament for weft, density: 136 pieces/in1 vertically, 84 pieces/in1 horizontally
Taffeta (plain woven fabric) with an n1 weaving width of 112 cm was woven.

Relax and refine this in a boil for 5 minutes at 130°C.
It was dried for 15 minutes.

Thereafter, an intermediate setting was performed at 160 to 180°C for 30 seconds, dyeing was performed at 120°C for 60 minutes, and then drying was performed at 130°C for 15 minutes.

Through the above processing, the fabric width was shrunk to 102.5 boxes.

This was set to a target width of 100 CrrL, at a temperature of 180° C., with a tenting rate of 2% (pin width: 104.6 crfL) and a set width setting rate of 1.045.

The resulting fabric (finished width: 100 crn) had good dimensional stability, excellent texture, and excellent surface quality.

On the other hand, when setting the same fabric with a width of 102.5crrL before finishing setting, the setting width was set at 10ocIrL (bending ratio -2.4%) at 180℃, and the width was larger immediately after setting and removing it from the pins. Shrinkage: 97.6crr
L, and the target width of 100 cm could not be obtained.

Example 2 Using the same fabric as in Example 1, the set target width was set to 1.
00CrrL, and set by adjusting the set width setting rate under each of the following conditions.

[Processing conditions]

Breadth rate 20%, 2%, 6% Treatment temperature = 120°C, 140°C, 160°C.

180°C, 200°C The obtained fabric was treated at 120°C, 140°C220
Except for the case where the temperature was 0°C, it had a good texture.

For those with a processing temperature of 200℃, regardless of the tentering rate,
The texture was rough, hard and flat.

In addition, those at 120°C and 140°C were too loose to set and could not achieve the desired texture.

These are collectively shown in FIG. 1 as the relationship between the heat treatment temperature, set width setting rate, and tenting rate.

For example, if a fabric with a width of 102.5 crrL is set at 160° C. with a tentering rate of 6%, that is, 108.65 crrL, the set width setting rate is 106.3, so the finished width will be 102.2 crrL.

Similarly, if the width increase rate is 2%, the finished width will be 100.6Crn.
, if the tenting rate is 0%, it will be 99.6 boxes, so if the target finishing width is to be 100C/rL, the set width setting rate is uniquely determined.

This figure shows that in order to achieve the target width, it is necessary to increase the set width setting rate as the set temperature and tentering rate increase.

As a result, the set width setting ratio of the fabric used in the present invention is 1.02 to 1.0 in the practical range of setting temperature of 150 to 190°C.
It turns out that it needs to be set to 08.

Example 3 7 consisting of polybutylene terephthalate copolymerized with 2.5 mol% of dimethyl 5-sodium sulfoisophthalate
Using 5-denier 36-filament twisted yarn with a twist of 1800 T/M, a georgette with a woven width of 112 mm was woven at a density of 97 vertical yarns/78 horizontal yarns/inch.

This was grained at 98°C for 15 minutes, and after air drying,
~180℃ for 30 seconds intermediate set and 120℃ for 60 seconds.
After staining for minutes, it was air-dried.

The fabric width was shrunk to 92.2 degrees by the above processing.

In order to smooth out the wrinkles during processing and improve the quality of the textured fabric, the target width was set to 90 degrees and the temperature was set to 180 degrees Celsius (J2).
Set in % (pin width 94.ICIn) (width setting ratio 1.0
45) Finish set.

The resulting woven fabric had a finished width of 90 cIrL, good dimensional stability, and an excellent texture.

On the other hand, when setting the same fabric with a width of 92.2cIrL before finishing setting, the setting width is set at 90α tentering rate (-1,9
%) at the same temperature (180℃), the width shrinks to 88cm immediately after being removed from the pin after setting.
rfL and the target 90 (m width) could not be obtained.

[Brief explanation of drawings]

FIG. 1 shows the relationship between heat treatment temperature and set width setting rate at various tentering rates.

Claims (1)

[Claims] 1. When heat setting a fabric mainly composed of fibers made of a polymer in which at least 80 mol% of repeating structural units are polybutylene terephthalate to a final finished target width at 150 to 190°C, the following A method for thermally setting a fabric, characterized in that a set width setting ratio defined by 1.02 to 1.08 is set. Set width setting rate = Set width)/Finish target width) (Here, set width is the pin setting width of the pin tenter,
The finishing target width is the product standard finishing width. )