JPS6071729A - Silk-like polyester filament yarn and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a yarn that is a cap of silk-like polyester filament.

[Prior art and its problems]

Conventional silk-like polyester filament yarn has a triangular cross-section similar to that of silk, and this cross-section and the combination of polyester alkali weight loss technology form the basis of the silk-like texture. In addition, as an application of this technology, in order to make polyester filaments that are more silk-like, composite spinning of filament yarns with different shrinkage rates, mixed fibers of filament yarns with different shrinkage rates, partial heat treatment of single shrinkage yarns, and filament yarns with different shrinkage rates can be applied. Although techniques such as partial heat treatment are beginning to make up the majority of silk-like knitted fabrics (including silk), they are still far from natural silk. Furthermore, many thick and thin threads have been developed to achieve the unevenness and appearance of silk threads. However, yarns like Thick and Thin generally have a high shrinkage rate of 30% or more, and -1: Because the hot water shrinkage rates of the yarns in the thick and non-thick areas are greatly different,
After the knitted fabric is finished, the heat during the dyeing process causes a υ"wrinkle" phenomenon, which causes wrinkles on the surface of the knitted fabric, which becomes a problem. In addition, yarns produced using these techniques are silk-like bodied IJ ester filaments that have straightness of bulk, fine unevenness, and uniform dyeability (satisfied with straightness of bulk and unevenness). There was a demand for the development of thread.

[Object of the present invention]

The present invention aims to improve the drawbacks of such conventional yarns.

[Configuration of the present invention]

The present invention consists of the following configuration.

rti+ uneven yarn made of polyethylene terephthalate multifilament, the yarn has Worcester unevenness in the length direction, U% is 05 to 45%, and the difference in hot water shrinkage rate of the constituent fibers in the yarn is within 2% , yarn bulk t' after heat treatment
1”1 degree is 12 cc/Lζ or more.

A silk-like polyester multifilament yarn characterized in that the cross-sectional shape of the constituent fibers is a multilobal shape of three or more threads, and at least one leaf has a wedge-shaped notch at the tip.

(2) A highly oriented undrawn polyethylene terephthalate yarn, in which the constituent fibers have a multilobal cross-sectional shape of three or more threads, and at least one leaf has a wedge-shaped notch at the tip. A silk-like polyester filament yarn characterized in that it is brought into contact with a pin at a temperature below the secondary dislocation point and then hot-drawn on a hot plate at 95-135°C at a natural draw ratio (ND) of 18,045-1.241 times. Method of manufacturing strips. The polyethylene terephthalate of the present invention includes dibasic acids such as carboxylic acid and naphthalene dicarboxylic acid, oxyacids such as oxybenzoic acid, and diethylene glycol and propylene glycol, which contain 80 moles or more of ethylene terephthalate units.

Neopentyl glycol, pentaerythritol.

One or more types of glycols such as polyethylene glycol monomethyl ether can be used.

In addition, in the present invention, the U section, which is Worcester Mura, is 05
~45% is required. This is to create fine unevenness comparable to that of silk. When U% is less than 0.5 yen, the uniformity becomes too high, and when f: exceeds 45%, the unevenness becomes too large, which is not preferable. Next, it is necessary that the difference in hot water shrinkage rate of the constituent fibers within the yarn be within 2%.

This is to reduce sink marks and wrinkles. (If the water shrinkage rate difference exceeds 2 degrees, sink marks and 7-wafers will become harsher, and 7-wafers will also appear too high, which is not desirable.) Next, the bulk height of the yarn after heat treatment is i 2 cc / g or more. This is necessary in order to improve the fit and drape properties.

Next, in the present invention, the cross-sectional shape of the constituent fibers is a multi-lobed shape with three or more lobes as shown in FIGS. 7A-D, and at least one of the lobes has a tip. Here, Fig. 7 A-
In D, the outer layer of polyethylene terephthalate, which is the constituent fiber, and/or the inside of the wedge-shaped cut may be coated with another polymer. For example, if the other polymer is a polyester containing 2.4 moles or more of 5-striasulfoisophthalic acid component, it will be selectively removed by the subsequent alkali weight reduction treatment and will have the same function as sericin in silk. preferable.

Next, in the present invention, the elongation at break of the yarn is preferably 35% or less. This is to reduce elongation and improve passability through higher-order processing. It is preferable that the hot water shrinkage rate of the necked yarn is 20% or more.

It is necessary to increase morphological stability and two-dimensional stability.

Next, the second invention (manufacturing method) of the present invention will be explained.

FIG. 5 is an example of a stretching process used in the production of the present invention.

The highly oriented undrawn yarn 5 includes a guide 6, a feed roller 7, a pin 8. Hot plate9. It passes through a roller 10 and is wound onto a bobbin 11.

Figure 6 shows the strength and elongation curve of highly oriented undrawn yarn.

ND indicates the natural stretching ratio, and NA indicates the stretching ratio. In producing a polyester yarn with yarn unevenness, a small difference in hot water shrinkage rate, and excellent bulk properties as in the present invention, the important points are a method for imparting yarn unevenness and a heat treatment method for reducing hot water shrinkage unevenness. ,
These include bulky heat treatment methods. Pin 8 is important for controlling unevenness. In other words, it is necessary to eliminate vibration and to keep the stretching tension uniform and stabilized. The yarn 5 fed from the feed roller 7 contacts the pin at an acute angle or is wound around the pin several times, thereby making it possible to control unevenness. In other words, the stretching point of the thread 5 is the circumference of the pin.
Control by dispersing into two. If a heat roller or the like is used as the feed roller 7 without using the pin 8, it is impossible to control unevenness at all. It is important to use the temperature of the pins 8 at a temperature below the glass transition point in order to perform non-uniform stretching. When the temperature is higher than the glass transition point, the drawing point is fixed, resulting in a uniform drawn yarn.

The hot plate 9 is necessary for heat treating the yarn and further randomizing the drawing. In order to make yarn with a difference in hot water shrinkage rate within 2 coefficients, the temperature of the hot plate 9 should be 5°C above the crystallization start temperature (i.e. 9°C).
5°C) to 165°C is essential. If the hot plate temperature is lower than this, there will be problems such as excessive shrinkage, and if it is higher than this, problems will occur such as too low shrinkage or insufficient bulk. The stretching ratio is an important point in optimizing the degree of elongation that imparts unevenness, and at a natural stretching ratio of ND or lower, unstretched areas and stretched areas coexist.

However, a stretch ratio (NA/ND) of 1.045 to 1.241, where this mixture does not appear as uneven dyeing or shrinkage rate unevenness, is most effective in reducing unevenness and bulkiness, and outside this range both can be satisfied. I can't.

In addition, in the method of the present invention, it is necessary to use fibers having the cross-sectional shape of the constituent fibers as illustrated in FIG. 7, or conjugate 1 fibers having the fibers as an inner layer component.

This is because when the raw yarn has such a multilobed shape and has a notch at the tip, drawing unevenness peculiar to the hot-drawn yarn is likely to occur, and the yarn can be made to resemble silk. It is still necessary that the raw yarn of the present invention be a highly oriented undrawn yarn. Such highly oriented undrawn yarn can be spun at a spinning speed of 2500 to 5000 m/
It refers to one with a birefringence of about 002 to 007. The reason why such a highly oriented undrawn yarn is employed is that it is easy to appropriately select the stretching ratio, and fine unevenness is easily formed by a combination of other conditions such as the stretching temperature.

[Actions and effects of the present invention]

The effects of the present invention will be explained using figures. To explain the difference between the yarn of the present invention and the conventional yarn, the yarn of the present invention is
As shown in Figure (A), the Worcester unevenness U% is relatively lower than that of silk (Figure 1 (C)), and yet it is large as shown in Figure 1 (C). Thread unevenness (
In contrast to A), yarn unevenness is a mixture of small yarn unevenness (B), whereas the conventional yarn has yarn unevenness (B) due to 7 un-done yarns, and even in the Worcester unevenness U%, there are 2 yarn unevennesses. The invented yarn is far from the form of silk. This is the most important feature for the yarn of the present invention. A C-turn due to uneven hot water shrinkage rate is shown in Figure 2. Hot water shrinkage rate difference 05-2.0%,
Table 1 shows the results of counting the number of pieces of 2.0 or more in the places marked with a circle as shown in Figure 2.

Table 1 As can be seen from Table 1, the yield ratio difference between the two yarns of the present invention is □5 to 2.
Whereas there are more than 4 pieces/m within 0%.

Conventional normal yarns have 2 yarns/rn or less, conventional partial heat treatment yarns have 28 yarns/rn or more, and thick and thin yarns have 6 yarns/rn or more. However, the difference in hot water shrinkage rate is more than 2 cm:
For example, during the finishing process of textiles, a ``wrinkle'' phenomenon occurs, resulting in grains. This difference in hot water shrinkage rate of 20% or more is included in the partial heat treatment system of conventional yarns and knock-and-thin yarns.
This is a problem when finishing textiles. For this.

It is difficult to obtain silk-like knitted fabrics. Further, in the case of yarns having a small difference in hot water shrinkage rate, the above-mentioned drawbacks do not occur, but satisfactory curling properties cannot be achieved.

However, when the difference in hot water shrinkage rate is within 2 coefficients as in the yarn of the present invention, the drawbacks of both conventional yarns can be fully covered and silk-like knitted fabrics can be easily obtained.

The bulk height of the yarn of the present invention is that the difference in shrinkage rate due to heat is small, so a uniform bulk of 6'' yarn can be obtained, similar to that obtained with silk. It is possible to obtain a bulk height higher than that of the invented yarn.However, this bulk height is a walnut-like bulk height that takes advantage of the difference in shrinkage rate due to heat among the yarns, and it is difficult to obtain silk-like knitted fabrics. It is not a desirable bulk height.The bulk density of the yarn needs to be 12 cc/g or more to obtain a silk-like knitted fabric, and it is difficult to obtain a silk-like knitted fabric with a bulk height lower than this. Conventional thick and thin yarns with high elongation and a high hot water shrinkage rate of 4 or more are difficult to handle in high-order processing. preferable.

The hot water shrinkage rate of the yarn itself is 20 inches or less, which is suitable for current size machines and dyeing and finishing machines.

A and B 2 The method for measuring physical property values of the present invention will be explained.

0 Wooster Unevenness The υ salary was measured under the following conditions using a yarn unevenness measuring device manufactured by Uchiu Star Co., Ltd. (Jxs method).

Range of 5cale 12.5%Yarn
5peed 8 m/m1nSlot Nu 8 False Twist Z ◎Hot water yield rate
00) under the following conditions.

Temp 9 8 ℃ Draw '97% Yarn 5pee6 10 m/m1nFull 5
cale 20 g Tension O, 1 g/d However, in the case of silk, swelling will occur, so Draw 102%
I did it.

◎Wrap the bulk yarn 80 times using a measuring device to make a total of 501 pieces (6 g,
75 D-+4fJJ, 150 D-+2 strings, etc.) If y'=-le, match to the closest one. ) Shi, put this all in a dryer (180C x 5min) J,! l! Do the following.

Heat treated, adjusted fC, stacked 8 times, measured using the measuring device shown in Fig. 4, and tightened by -1''.

L: Tape length when hanging a load of 50 g W: Weight of sample covered with a 25 cm wide tape Examples will be described below.

Example 1 A highly oriented undrawn yarn with birefringence Δn = 0.032 was spun from polyester containing polyethylene terephthalate as a main component. The cross-sectional shape of the constituent fibers is as shown in Figure 7 (1), and inside the wedge-shaped notches there is polyethylene terephthalate copolymerized with 6 moles of 5-stria sulfoisophthalic acid component.

Stretching was then carried out under secondary conditions using the process shown in FIG.

Processing conditions: feed o - rough 400 m/m pin temperature 50°C winding once hot plate temperature 115°C feed roller 10 680 m/min stretching ratio (N
A/ND) The yarn of the present invention obtained by 1.11 times, the commercially available Nsokandong yarn with a boiling water shrinkage rate of 15% as Comparative Example 1, the silk-like bulk high yarn commercially available as Comparative Example 2, and Comparative Example 6 Table 2 shows the characteristics of each commercially available ordinary yarn.

The appearance of the cloth was woven at 98°C
The specimens were treated with alkaline hot water, and the appearance of sink marks and scratches was evaluated. The judgment was as follows. ○ marks are good with no sink marks or scratches. The mark Δ has one sink mark and is bad. The X mark is a sink mark,
There are a lot of scratches and it is bad.

As can be seen from the above, the yarn of the present invention has a continuous appearance on the fabric. The fabric after dyeing also had a similar texture and appearance.

[Brief explanation of drawings]

Figure 1 shows an example of yarn unevenness U%. A is the yarn unevenness of the yarn of the present invention, B is the yarn unevenness of the thick and thin yarn, and C is the yarn unevenness of the silk yarn. FIG. 2 is a chart of the difference in hot water shrinkage rate, and the areas marked with ◯ indicate a difference in shrinkage rate of 05% or more. FIG. 6 shows the pattern of the difference in hot water shrinkage rate, where A is the yarn of the present invention and B is the knock-and-thin yarn. Fourth
The figure shows an example of a device that measures the bulk height of yarn. 1 is a sample, 2 is a tape with a width of 2.5 cm, 3 is a load of 50 g,
4 is a scale. FIG. 5 shows an example of the manufacturing method of the present invention,
5 is an intermediately oriented undrawn yarn, 6 is a package of guys, 7.10 is a feed roller, 8 is a pin, 9 is a hot plate, and 11 is a bobbin. Figure 6 shows the strength and elongation curve of the intermediately oriented undrawn yarn, and the ND
is the natural stretching ratio, and NA is the stretching ratio. FIG. 7 is an example of the cross-sectional shape of the constituent fiber assembly of the present invention. 5: Highly oriented undrawn yarn package 8: Pin 9: Heat plate 7.10: Nip point Patent applicant Toshi Co., Ltd. 1 Dantou Z diagram 3rd calm; 1-Otsuken B<f) jf )q times

Claims (5)

[Claims] (1) It is an uneven yarn made of polyethylene terephthalate multifilament, the yarn has Worcester unevenness in the length direction, the U% is 05 to 45 inches, and the difference in hot water shrinkage rate of the constituent fibers in the yarn is 2%. or less, and the bulk height of the yarn after heat treatment is 12 cc/g or more. and the cross-sectional shape of the constituent fibers is a multilobal shape of three or more lobes,
A silk-like polyester filament yarn characterized in that at least one leaf has a wedge-shaped notch at the tip. (2) The silk-like polyester filament yarn according to claim (1), characterized in that the elongation at break of the yarn is 65 modulus or less. (3) The silk-like polyester filament yarn according to claim (1), wherein the yarn has a hot water shrinkage rate of 20% or less. (4) Highly oriented undrawn polyethylene terephthalate yarn, in which the constituent fibers have a multilobal cross-sectional shape of three or more lobes, at least one of the lobes has a wedge-shaped notch at the tip, and the yarn is not cut. A silk-like polyester filament yarn characterized in that the strip is brought into contact with a pin at a temperature below the secondary dislocation point and then hot-drawn on a hot plate at 95-165°C at a natural draw ratio (ND) of 1045-1241 times. Method of manufacturing strips. (5) The polyethylene terephthalate highly oriented undrawn yarn is a conjugate fiber, and the component covering the outer layer is 5-
The method for producing a silk-like polyester five-sided tyfilament yarn according to claim (4), characterized in that the polyester is a polyester copolymerized with 24 moles or more of sodium sulfoisophthalate-1.