JPS6285026A - Conjugated polyester staple fiber for woven or knit fabric - Google Patents

Abstract

PURPOSE:To provide the titled staple fiber having a straight part at least one end of fiber terminal and spinnable without causing the troubles of nepping and web breakage even if three-dimensional crimps of high percentage crimp and large number of crimps are actualized. CONSTITUTION:A straight part having a total length of 20-50% and essentially free from development of crimp by the heat-treatment at <=180 deg.C is present at least one end of the fiber terminals of the objective staple fiber. The crimped part other than the straight part has a number of crimps of 8-15/25mm, percentage crimp of 15-33% and ratio of (percentage crimp)/(number of crimp) of >=1.5. The fiber length of the staple fiber is >=50mm. The spinnability of the fiber can be maintained even by spinning after cotton dyeing. Most part of the fluffs are straightened to prevent entanglement. It has high resistance to slip-off and a woven or knit fabric produced therefrom has excellent feeling, bulkiness, softness and suringness.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to a polyester composite staple fiber for woven or knitted fabrics having a special crimp shape, and more specifically to a composite staple fiber with a highly three-dimensional crimp shape. The present invention relates to providing excellent spinnability and spun yarn quality to textiles, as well as providing excellent touch, bulk corner pillars, resilience, and anti-build properties to woven and knitted clothing fabrics.

[Prior art and problems]

The aggregate of 5-dimensional densified polyester composite staple fibers with high densities and high densities has been utilized mainly in conventional futon cotton due to its unique densities and structure. However, when used as a spun yarn for woven and knitted fabrics, a large number of nep spots occur in the spun web during the spinning card process, making it impossible to obtain a spun yarn with satisfactory yarn quality, and in extreme cases. Currently, this method is not used for woven or knitted fabrics because of the problem that the web spun from the card breaks.

In order to solve the above problems, attempts have been made in the past to improve spinnability and yarn quality by reducing the shrinkage of composite staple fibers to 15 coefficients or less, but in this case, sufficient bulk corner pillars for woven and knitted fabrics have been attempted. However, it had the disadvantage of not being able to provide repulsion.

In addition, attempts have been made to make the crimp latent in the staple fiber manufacturing process and then create spun yarn by applying the mechanical crimp needed to improve spinnability and yarn quality, and then fully manifesting the crimp at the yarn or woven or knitted fabric stage. However, in this case as well, there is a drawback that sufficient shrinkage cannot be achieved when single fibers such as spun yarn or woven or knitted fabrics are mutually restrained.

In addition, in woven and knitted fabrics that use staple fibers, there are many cases in which the staple fibers are dyed and then spun into yarn.In this case, latent shrinkage occurs during dyeing, causing trouble in the spinning process. There was a drawback. In addition to problems with spinnability and yarn quality, when using three-dimensional crimped composite staple fibers in woven and knitted clothing, it is effective in fall and winter clothing that utilizes the bulge of the woven and knitted fabric; There were problems in that the polyester composite staple fibers had little twist in the spun yarn, and many had a lot of fuzz on the surface of the woven or knitted fabrics, and the anti-build properties of the polyester composite staple fibers were insufficient.

In order to improve anti-pilling properties, it is conceivable that the method used for general polyester staple fibers, in which the degree of polymerization is completely lowered to reduce the strength characteristics, could be applied to composite staple fibers, but it is possible to apply this method to composite staple fibers. However, the actual situation is that composite staples with three-dimensional crimping have almost no anti-pilling effect when the strength properties are reduced.

Recently, as a means to improve anti-building properties, JP-A-56'-118
In Publication No. 917, at least one end of the fiber is straightened to suppress the entanglement of fuzz, and the fiber shrinkage number in the details is increased by 15% to 15 threads/25 threads. However, polyester composite staple fibers do not sufficiently satisfy spinnability, anti-build properties, bulk corner pillars, and resilience when used in woven and knitted clothing.

In addition, Japanese Patent Application Laid-open No. 58-87!115 has a five-dimensional crimp material as a feather-life filling material, and also has crimp details and non-stripe parts. Polyester staple fiber has been proposed, but this can be made into futon products only by blowing with air without going through a carding process. It doesn't improve it.

[Purpose of the invention]

Object 1+-1 of the present invention: without losing the characteristics of the idopainide type polyester composite nutable fiber that exhibits a high number of wires and a high shrinkage V in three dimensions, To provide a novel polyester composite staple fiber for woven or knitted fabrics which does not cause web cutting and has excellent spun yarn quality.

The second objective is to create a polyester composite that not only has excellent spinnability and yarn quality, but also has a texture similar to Kou wool when made into a woven or knitted fabric, has an umbrella corner, resilience, flexibility, and has excellent building resistance. Our goal is to provide staple fibers.

The third objective is to create a polyester composite staple fiber that does not reduce spinnability even when dyed with cotton, yet provides a woven or knitted fabric with excellent texture, stiffness, resilience, flexibility, and anti-build properties. It is about providing.

[Structure of the invention]

The above-mentioned object of the present invention is achieved by the following configuration.

(1) at least 85 moles of repeating unit Oi) per month
A polyester composite staple fiber in which a two-component polyester, which is 1,000 terephthalate, has an apparent six-dimensional densification property, wherein the two-component polyester staple fiber has an intrinsic viscosity of 0.55 or less, The component on one side is composed of a component that exhibits a higher drawing edge shrinkage rate than the other components, and has a strength of 2.5 to 4.5 g/ct and a bending strength of 15.
What is the strength property of 00 times or less, 50%, ≠1180℃
In the following heat treatment, substantial 9-fold shrinkage occurs, no straights with a length of 5 to 30 mm are present, and the number of lines in the tightened area is 8 to 15 mm.
Mountain / 25 藺, Ken shrinkage is 15-35 壬, Ken shrinkage / Ken wire number ratio is 1.5 or more, rut fiber length is 50 Kll! A polyester composite staple fiber for woven or knitted fabrics having a special crimped shape characterized by the following:
Ru.

The configuration of the present invention will be explained in detail below.

In the two-component polyester constituting the staple fiber of the present invention, at least 85 moles or more of repeating units are ethylene terephthalate. When the proportion of ethylene terephthalate, which is a repeating unit, is lower than 85 molar ratio, the dimensional stability peculiar to polyethylene terephthalate fibers decreases.
My lower back loses its tension. Furthermore, depending on the type and amount of the copolymer component, it may lead to an extreme decrease in Tg and cause deterioration of building resistance, so it is preferable that 90% or more of the repeating units be ethylene terephthalate.

The present invention is a polyester composite staple fiber having apparent five-dimensional embossability, in which these polyesters are glued side-by-side, and the average intrinsic viscosity of the two glued components is 0.55. The components are composed of components that exhibit high stretching tension and shrinkage relative to other components.

It is necessary that the

In addition, in the present invention, the intrinsic viscosity refers to O-
This is a value determined from the viscosity measured in ``Lofeno''. In addition, the average rolling viscosity is a value obtained in the same manner as the total solid 6-viscosity of the entire composite staple fiber, and is preferably 0.52 or less from the viewpoint of further improving the anti-build property. The difference in intrinsic viscosity was determined from the difference in hardness of each component polymer.

An average intrinsic viscosity of 0.55 or less is essential from the viewpoint of strong properties necessary for building resistance.1 It is well known that five-dimensional shrinkage properties can be developed by gluing polynisdels with different viscosity components side-by-side. As for the content, in the staple fiber manufacturing process, 4
1. : In order to obtain a staple eyeper with a high number of wires and a high degree of shrinkage as in the invention, it is necessary to increase both the stretching tension and shrinkage of the components on one side, and then apply FIl, male, etc. to the relaxation heat treatment after stretching. It is necessary to overcome mutual restraint and make Kenjitsu fully manifest. For this reason, it is desirable that the stretching tension is preferably 0.1 g/d or more and the shrinkage ratio is 1% or more.

To make the formed building fall off easily in a small stage 2
It is necessary that the components have an average intrinsic viscosity of 0.551, a bending strength of 1500 times or less, and a strength of 2.5 to 4.5 g/d, more preferably 1000 times or less under I'i0.52, 2.5 ~4.0 g/d.

However, if the average intrinsic viscosity of the two components is less than 0.45i or the bending strength is less than 150 times, the fibers will break during the spinning process.
In addition, abrasion of the product may lead to a decrease in strength, which is undesirable. Moreover, when the strength is less than 2.5 g/d, these phenomena become so severe that it becomes impossible to withstand practical use. The bending strength is 1500 times,
Moreover, if the strength exceeds 4.5 g/d, sufficient pile building properties cannot be obtained.

In addition, the staple fiber of the present invention must have a fiber length of 50 mm or more, and at least one end must be 180°C J at a total length of 20 to 50% of the entire Vc fiber length.
5 to 50, substantially no shrinkage occurs during heat treatment of sawtooth.
It is necessary to have a straight portion with a length of Kll.

When the overall length of the fiber is less than 50 mm, the straight portion of the present invention is imparted, and the staple fiber suffers from an extreme decrease in entanglement, resulting in lap licking in cards, web sagging,
This causes the web to break, making it difficult to handle in actual spinning production. -1L, and furthermore, it becomes difficult to produce with high precision a fiber having a straight portion at one or both ends of the fiber. Further, the preferable overall fiber length is 60 threads or more.

Preferred forms of the straight portions to be mixed in the fibers include one having straight portions at both ends of the fiber as shown in FIG. 1, and one having all the straight portions only at one end of the fiber as shown in FIG. Note that when it is subjected to spinning or the like as a staple fiber aggregate, a mixture of the two may be used. In addition, it is acceptable for fibers with a straight part at both ends and a straight part in the center, and fibers without a straight part and only a straight part to be mixed in the aggregate, but they are used from the viewpoint of spinnability and anti-build properties. The ratio of both in the polyester staple fiber is 2.
It is preferable that the number of cycles is 0 or less.

However, if there are straight parts at both ends, the total length of each (in Figure 1, if there are S1 and S2 parts (Fig. 2), the length of the straight part is 5tOtal.The length of the straight part is 5tOtal. The total length is W, and S2.W is the total length of the fibers.

If the total length of the straight part is less than 20% of the total length of the fiber, or if the total length of the straight part is less than 50%, it will be less effective in reducing excessive entanglement, which will reduce the effect of preventing fluff from tangling. becomes. If the total length exceeds 50, the total length of the straight section will be 30IQ.
On the contrary, if it exceeds this, the entanglement property will be excessively reduced, resulting in lap licking on the card, web sagging, and web breakage, which is not preferable. A more preferable straight length range of the straight portion is 50 to 4 of the total length of the fiber! I regret it.

Polyester Staple Fiber-i When used by spinning after cotton dyeing, troubles during spinning cannot be avoided if crimp occurs in the straight portion due to the heat during cotton dyeing.

Furthermore, as will be described later, if crimp occurs in the finishing set in the dyeing and finishing process for improving dimensional stability of woven or knitted fabrics made from polyester staple fibers, the anti-pilling properties will be reduced. Each polyester staple fiber dyeing and finishing set is moist heat 130
Since dry heat conditions of up to 180°C are adopted, it is necessary that the straight portions do not undergo shrinkage during heat treatment at least at 180°C or lower.

Is there an important relationship between the touch of the woven or knitted material, the corner pillars of the umbrella, and the repulsion properties regarding the shrinkage characteristics of the closure part? However, from the viewpoint of spinnability, in order to provide appropriate entanglement in the carding process, K is set above the Ken contraction number 8 to 15 threads / 25 columns, the Ken contraction number 15 to 35, and the Ken contraction degree / Ken contraction M. It's necessary.

When the number of wires exceeds 15/25, the depth of the peaks and valleys of the shrinkage decreases, and conversely, the entanglement property decreases, and even if the bulk corner pillars of the fabric are improved, the fabric feels soft. This causes a decrease in compressibility. Further, if the value is lower than 8 threads/25 KIi, only a woven or knitted fabric inferior to that of the umbrella corner pillars can be obtained.

Composite staple fibers with a shrinkage of more than 35 cm inevitably lead to an increase in the number of fibers during production, making it difficult to control the fibers to less than 15 threads/25 threads. It also causes draft spots during the drafting process. If the degree of shrinkage is less than 15, not only the entangling property will be lowered but also sufficient umbrella corner pillars will not be restored to the woven or knitted fabric.

A more preferable range of the degree of condensation is 20 to 60 tsu.

Further, it is desirable that the degree of shrinkage is maintained at 5% or more even after the spinning process. The ratio of Ken shrinkage/Ken wire number is required to be 1.50 or more in order to provide suitable entanglement and excellent umbrella corner pillars, soft feel, compressibility, and resilience to the woven or knitted fabric. 1.
If it is less than 5, the corner pillars of the umbrella will deteriorate.

Preferred specific examples of the polyester composite staple fiber will be described.

A preferred example is a combination of polymers. At this time, if the intrinsic viscosity difference is less than 0.06, the ability to develop shrinkage tends to decrease. Moreover, if the number is 1 greater than 0 or 12, the number of Ken lines will increase, which is not preferable.

The difference in intrinsic viscosity between the two components is determined by the polymer moisture content before spinning: o,
oos winter or less, N2 gas at the time of melting, melt residence time of less than 50 minutes, and melting temperature of less than 300° C. When spinning is performed, the difference in intrinsic viscosity of the polymer before spinning is defined as the difference in intrinsic viscosity between the two components of the fiber.

In addition, since woven and knitted fabrics for fall and winter are often mixed with wool, wool has a large performance deterioration when exposed to heat above 100°C, so we use polyester composites that can be dyed at normal pressures below 100°C and with Kanaon dyes, which do not contaminate wool. When the K fd 2 component for obtaining the staple fiber is polyethylene terephthalate copolymerized with 3 to 6 moles of ethylene-5-sulfoisophthalate, and the difference in intrinsic viscosity between the two components gives five-dimensional shrinkage ability, The strength and bending strength of staple fibers are affected by components with high intrinsic viscosity, and are often subject to restrictions when lowering the strength to a level sufficient to promote building fall-off. Therefore, in order to maintain the strength/flexural strength level at a necessary and sufficient level and provide high bending ability, at least one side group ``'1.
Ethylene-5-cysium inophthalate is copolymerized on one side, and the difference in copolymerization rate is 1 molar or more, or ethylene isophthalate and trimellitic acid are copolymerized on at least one side component. Also, a combination of components in which the difference in copolymerization rate with other components is 0.5 mol% or more is also a preferred example. In either case, the intrinsic viscosity difference is 0.
Intensity of two components by lowering 05υ.

It is possible to easily match the bending strength level, and by providing a difference in each copolymerization rate, it is possible to easily provide the target Ken line number and Ken condensation degree.

Next, an example of a preferred method for producing a polyester composite staple fiber having the characteristics of the present invention will be described.

In order to obtain the three-dimensional shrinkable conjugate fiber of the present invention, the two-component polyester polymer of the above combination was used, converged to at least 100,000 denier, and drawn by a commonly used drawing method of polyester staple fiber. 10 more
By heat-treating the tow in a relaxed state in a tow heat treatment machine at 0 to 150°C, it is possible to obtain a whole tow that has developed shrinkage throughout. The curdled tow is shown in FIG. A group of chiropractors■
After spreading the fibers to a uniform density with the embossing roller ■, heat treatment is performed intermittently and at a constant cycle length to partially eliminate the tightening part and straighten it to the target length, and then emboss the first part of the stray. By cutting with a P2G cutter in conjunction with a roller, the composite staple fiber having the special crimped form of the present invention can be produced. In the case of intermittently heat-treating with an embossing roller, it is preferable to heat-treat at at least 180° C. or higher in order to prevent the appearance of crimp in the straight portion during the dyeing and finishing step. In addition, in order to provide a straight part and define the overall length of the fiber, heat treatment is performed using a tzu embossing roller to a length equal to the total length of the straight part, so that the length of the center of the straight part and the center of the next straight part is equal to the length of the straight part. It is preferable to provide the straight portion so that the length is equal to the overall length. Furthermore, it is necessary to employ a cutter rotor for the KO power cutter whose rotation is interlocked with the embossing roller and which can cut the length between the center of a straight section and the center of the next straight section, that is, the length corresponding to the entire length of the fiber. The accuracy of the cutting position varies depending on the shrinkage unevenness of the supplied curled tow, the opening unevenness on the straightening tow bar, etc., but it can be adjusted by controlling the tow tension in the embossing roller and the tow tension coming out of the embossing roller. is necessary.

In addition, in order to provide high shrinkage ability when performing side-by-side composite spinning, high shrinkage and high tension components are arranged in a convex shape as shown in Fig. 5, and the occupation ratio on the outer peripheral surface of the fiber cross section is 30 to 5.
It is desirable to set the value within the range of 0%. If the arrangement is out of this range, the ability to develop shrinkage will decrease, and there will be cases where sufficient shrinkage cannot be achieved even if a relaxation heat treatment is performed after stretching.

〔Effect of the invention〕

As described above, firstly, the present invention has a straight portion at at least one end of the fiber, so it is excellent even when using a polyester composite staple fiber that has a high number of wires, a high degree of shrinkage, and has manifested three-dimensional shrinkage. It can provide spinnability and yarn quality.

Furthermore, the straight part is designed to prevent shrinkage when heat treated at temperatures below 180°C.

Even when the polyester composite staple fiber is dyed with tM, it does not exhibit crimp, and its spinnability is not impaired even when it is cotton-dyed and edge-spun.

Secondly, the woven and knitted fabrics obtained using this composite staple fiber have a corrugated texture, bulkiness, and softness because the binding parts other than the straight part are given an optimized number of fibers and a degree of contraction. It has properties and repulsion properties.

Thirdly, since the fiber has a straight portion at at least one end, preferably both ends, most of the fuzz that appears on the surface of the spun yarn and fabric is straightened, and the fuzz becomes tangled.
The staple fibers present inside the spun yarn have a high degree of shrinkage, so they have a high slip resistance, and the bending strength of the staple fibers is weakened, so even if a pill forms on the fabric surface, it is easy to cut and fall off. Therefore, it has excellent pill resistance.

The polyester composite staple fiber of the present invention is effective in the field of woven and knitted fabrics for fall and winter clothing that requires fullness of the fabric, and can be particularly preferably used in the field of woven and knitted fabrics blended with 100% polyester and wool.

The present invention will be explained in further detail by way of examples.

In addition, the physical properties in Examples were measured as follows.

A, bending strength F, using a Dillman bending abrasion strength measuring device, the load applied to the single fiber was 200~/denier, and the bending speed was 6
It is expressed as the number of times until a single fiber breaks when subjected to bending abrasion at 0 times/min.

B. Ken wire number, Ken shrinkage degree Using a Ken shrinkage meter, Ken wire number was measured as the Ken wire number per 251Q when a load of 2η/denier was applied to a single fiber. In addition, the length of the single fiber (j'c) was measured by applying a load of 2Wt9/denier to the single fiber, and the following E1c300
mq/at7) Longer length when loaded! (l-1o)/lo)
) was sought.

Example 1 Intrinsic viscosity 0.5 y (A) and o, a y (B)
, 0.66(c) ,! : o, s 2 (D
) of polyethylene terephthalate polymers, 9
60 g/min, 2 per component using a side-by-side composite spinneret with a hole count of 6 holes.
Components total 120g/min discharge amount (composite ratio 50
150) at a speed of 1300 m/min to obtain an undrawn yarn. After drawing the undrawn yarn, a tow was made into a bundle of 200,000 denier and passed through a bath with a liquid temperature of 90°C for 3
．． Stretched 5 times, then reduced moisture content to 2 between crimper rolls.
After narrowing down to 0% or less to give the tow a light convergence, 14
Relaxation heat treatment was performed at 0° C. for 15 minutes to develop three-dimensional crimping.

First, for the (at/ip) polymer combination Ken shrink tow, a part of it was cut into 76 strands and used as raw cotton for comparison (
1).

Next, the remaining fAl/[Bl polymer combination Ken shrink tow,! : fat/(Di polymer combination Ken shrink tow) After checking the straightness of the embossing roller and heat-treating it at 200℃ for a total of 3 seconds, the distance from the center of the straight part to the center of the next straight part is 76KIi'ζ I added intermittent straight parts so that
Cut the straight part with a C cutter and the total fiber length is 761.
Raw cotton (2)i3) with a tar straight length of 60 strands was obtained. The obtained staple fibers (1) to (3) had the properties shown in Table 1.

Table 2 shows the results of all evaluations of spinnability and yarn quality using the three raw cottons (1) to (3) above.

(Hereinafter, blank spaces) The raw cotton produced by Levelya (2) according to the present invention was satisfactory in terms of passability in the carding process and yarn quality.

The spun yarns in (1), (2), and (3) in the table above are processed into double yarns, then woven into a 2-2-2 soil (surge) fabric in one pass, dyed and finished, and then sheared and sintered to give a clear finish. The properties of the woven Mo fabric were as shown in Table 3.

Table 3 As shown in the table above, the fabrics of Level & (2) of the present invention have excellent anti-build properties and exhibit fabric properties equivalent to those of conventional composite stables, which have a high number of wires and a high degree of shrinkage. It gave an extremely wool-like texture. On the other hand, the fabric of level flat (3) had poor anti-pilling properties and was hard in texture.

After dyeing at 120°C, it was dried under dry heat at 120°C. At this time, no shrinkage was observed in the straight portion, and the fiber shape was almost the same as before dyeing.

This dyed cotton was spun after adhering 0.35% gold as a spinning oil agent. As in Example 1, there were fewer neps and web irregularities in the carding process, and the quality of the spun yarn was normal. : l1li] level.

Example 6 Polyethylene terephthalate with intrinsic viscosity 1o5o) +El
1.0 mol% of ethylene isophthalate for one component and the other component [ffi $1 to so
and trimellitic acid 1. A side-by-side type composite cap similar to that in Example 1 was made using the respective polymer combinations of polyethylene terephthalate (F) copolymerized with 0 mol % and polyethylene terephthalate (fG) copolymerized with 5 mol % of ethylene/inophthalate having an intrinsic viscosity of 0.50. Discharge rate of 44 g/min for one component used, total of 88 g/min for two components (combined ratio 50150), 1200 m /min
It was spun at a speed of After stretching, the obtained undrawn yarn was bundled to a density of 200,000 deniers, passed through a bath at a liquid temperature of 75°C, stretched to 3.2 times, and then transferred between a crimper and a roll so that the moisture content was 20 parts or less. The tow was squeezed lightly to concentrate the tow, and then subjected to relaxation heat treatment at 140° C. for 15 minutes to develop three-dimensional shrinkage. The single fibers of the obtained Ken-cured tow exhibited the characteristics shown in Table 4.

Table 4 As shown in the above table <fF:I/' Although the desired characteristics were obtained for the combination of fFI (the combination of K+/[Gl was insufficient in terms of shrinkage characteristics).

Therefore, Table 5 shows the results of comparing the stretching tension and stretching lI1.male shrinkage rate when fEl, (Fl, (Gl) polymers were spun alone and stretched at the same stretching temperature and magnification.
Shown below.

Table 5 As shown in the table above, (F) is the stretching tension for (E) polymer,
In contrast, fGl has a high boiling yield but low stretching tension (composite fibers of El/tGl polymers cancel each other out and do not provide sufficient shrinkage properties). It shows.

All staple fibers with short straight lengths and cut lengths shown in Table 6 were prepared using Ken shrink tow from Level Shop (4) combined with the polymer of fil/(F).

(Hereinafter - blank space) Table 7 shows the results of a comparative evaluation of the spinnability of the above-mentioned staple fibers in the carding process.

Table 7 It was impossible to spin the (41-(11) staple fibers with a length of 44jEI.

For levels (4)-421 and (4)-(3) in the above table, spun yarns of 2/48 were produced by continuing through the spinning process.

The yarn quality was satisfactory in terms of Worcester's spots and the number of yarn defects, so 2. /'2 Noil (surge) fabric was woven, then dyed and finished with a thin, smooth, lightly raised fabric. (41-(2'l), (4)-(3) The fabrics obtained from the staple fibers are all grade 4 ICI method building resistance, and are sufficiently durable for practical use. It exhibits the excellent knotted texture, flexibility, compressibility, umbrella corner pillars, and resilience characteristic of fiber]-7.

Example 4 Polyethylene terephthalate was copolymerized with 5 moles of ethylene-5-sodium inophthalate and had an intrinsic viscosity of 0.
60 (H) and o, 52 (1) using the same side-by-side composite cap as in Example 1 with the combination of polymers 1
Component: 44g/min, total of 2 components: 88g/min
Discharge amount of in (composite ratio 50150), 1200m/m
An undrawn yarn was obtained by spinning at a speed of 1.5 in.

After stretching, the undrawn yarn was bundled to a thickness of 200,000 deniers, passed through a bath with a liquid temperature of 80°C, and stretched 3.2 times.
Next, the tow was squeezed so that the amount of water molecules between the crimper and the roll was 20 or less, and the tow was then heat-treated in a relaxed state for 15 minutes at 140° C. to develop five-dimensional crimping. Single fiber a constituting the fibers
m degree 2.5 denier, Ken wire number 11.5 peaks/'25m,
Ken contraction degree 19.5 t, ratio of Ken contraction degree / Ken line number t 7
Q, strength 3.2 g/d.

It had properties such as an elongation of 58 and a bending strength of 500.

Using the same method as in Example 1, only the temperature condition was changed to 19Q°C, all the straight parts were prepared, and then the straight parts were kneaded 5 times to obtain a fiber length of 76 fibers. 5) was obtained. Staple 7 at this time
The total straight length of the eye bars was 3011, and the ratio of the length of the straight part of the straight part of the end of the fibers was 88%, which was 5 mm or more, and the ratio of 0 to less than 5 mm was 12 percent.

Moreover, the average intrinsic viscosity of this composite staple fiber is 0.
．． It was 52.

Mix 60 pieces of this staple fiber and 40 pieces of wool cut with a 76 piece attenuator and spin it #L, 2.
, /52 spun yarns were obtained. At this time as well, there were few occurrences of neps and web unevenness during the carding process, and the spinnability was good, and the yarn quality was also satisfactory.

Polyester and wool were dyed using a cationic dye and an acid dye using this spun yarn in a skein at a temperature of 90°C. Next, a flat knitted fabric with a 2×2 rib structure and 12 gauge was produced. The obtained knitted fabric has sufficient centity for the Hoffman set,
The pill resistance of the IC construction method was grade 5, which was sufficient for practical use. In addition, monocomponent staple fibers made of polymerized polyethylene terephthalate (fineness 2.5 d, strength 6.0 g/d, elongation 40
%, bending strength of 380 times, two-dimensional shrinkage of Ken wire number of 12 threads/25 x m, Ken shrinkage of 15 factors), the building resistance of a flat knitted fabric similarly spun, yarn-dyed, and knitted was 1 to 2. The corner pillars of the umbrella were also of inferior quality.

Example 5 A polyethylene terephthalate polymer (J) prepared with polyethylene terephthalate (J) was subjected to the spinning drawing heat treatment and straightening method shown in Example 4 to obtain a total straight length of 50rxx at one end or both ends of the fiber ends (at A composite staple fiber shown in Table 8 having a fiber length of 76- was obtained.

Note that this composite staple fiber had an average intrinsic viscosity of 48 o, 1, Table 8.
A 1/48 spun yarn was prepared by completely blending 30% wool cut into 6M. Since the spinnability and yarn quality were satisfactory, I decided to use nuclear spun yarn. Using 2. /2 Soil (Viera) weave and noise were made. At this time, two levels of fabric were obtained by applying a clear (shearing/burning) finish and a milled (floating) finish.

The ICI pill resistance of the clear-finished fabric was 4th grade, and the ICI pill resistance of the milled fabric was 3rd grade, which was sufficiently durable for practical use.

[Brief explanation of drawings]

1 and 2 show the compressed form of the polyester composite staple fiber of the present invention. FIG. 3 is a schematic view showing an example of the manufacturing method of the present invention and fibers in each process, and FIG. 4 is a cross-sectional view of the embossing roller along x-x'. Moreover, FIG. 5 is an example of a preferable composite form in the present invention. ■ Ken shrinking toe ■ Dancer roller ■ Adjusting tow bar ■ Emboss roller ■ Tow path regulation guide (toe width standard) L11 guy ■ EC power rotor ■ Ken shrinking toe ■ - Straight part is completely removed - r tow [phase] Staple fiber A with cut straight part High shrinkage/high tension component B Low shrinkage/low tension component

Claims (5)

[Claims] (1) A polyester composite staple fiber having apparent three-dimensional ken-shrinkability in which a two-component polyester in which at least 85 mol% or more of the repeating units is ethylene terephthalate is laminated side-by-side; The intrinsic viscosity is 0.55 or less, the component on one side is composed of components that exhibit higher stretching tension and shrinkage rate than other components, has a strength of 2.5 to 4.5 g/d, and a bending strength of 1500 times or less. , and at least one end of the staple fiber has 20 to 50% of the total length of the fiber.
It has a straight part with a length of 5 to 30 mm that does not substantially cause shrinkage when heat treated at 180°C or lower, and the number of shrinkages in the fastened part is 8 to 15.
A polyester for woven or knitted fabrics having a special longitudinal shape, characterized by a peak/25 mm, a degree of contraction of 15 to 35%, a ratio of degree of contraction/number of contractions of 1.5 or more, and a fiber length of 50 mm or more. Composite staple fiber. (2) The polyester composite staple fiber for woven or knitted fabrics according to claim (1), wherein the difference in intrinsic viscosity between the two components is 0.06 to 0.12. (3) The difference in intrinsic viscosity between the two components is less than 0.05, and at least one side of the component is copolymerized with ethylene-5-sodium sulfoinphthalate, and the difference in copolymerization rate with other components is The polyester composite staple fiber for woven or knitted fabrics according to claim (1), characterized in that the content is 1 mol % or more. (4) The two components consist of polyethylene terephthalate having normal pressure cation dyeability copolymerized with 3 to 6 mol% of ethylene-5-sodium sulfosophthalate, and
The polyester composite staple fiber for woven or knitted fabrics according to claim (1), wherein the components have an intrinsic viscosity difference of 0.05 to 0.10. (5) The intrinsic viscosity difference is 0.05 or less, and ethylene terephthalate and trimellitic acid are copolymerized as components on at least one side, and the difference in copolymerization rate with other components is 0.5 mol% or more, respectively. A polyester composite staple fiber for woven or knitted fabrics according to claim (1).