JPH01162813A - Splittable conjugate fiber and mixed yarn therefrom - Google Patents

Abstract

PURPOSE:To obtain the subject conjugate fiber capable of giving bulky cloths with soft feel, thus suitable for clothes, by separating a fiber-forming polymer into the core segment and at least specified number of petal-like segments through a specific polymer. CONSTITUTION:The objective conjugate fiber where in the transverse section of the filament, a fiber-forming polymer 1, 2, A such as polyamide or polyester is separated into >=7 segments through a polymer 3, B more soluble than said fiber-forming polymer, also one of said segments is the core segment present at approximate center of the filament and the remaining >=6 peral-like segments 2 are so arranged as to surround the core segment 1, furthermore at least part of each petal-like segment 1 occupies the surface of the filament.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of industrial application> The present invention relates to splittable conjugate fibers. More specifically, by dissolving and removing highly soluble polymers after forming into fabrics such as woven or knitted fabrics, it is possible to open segments of the single-fiber-forming polymer and obtain fabrics with a bulky and soft feel. This invention relates to a splittable fabric suitable for use in clothing.

<Prior Art> A method is already known in which, after making a fabric from composite fibers, one of the polymers is dissolved and removed and the other is split into thin fibers to obtain a fabric made of thin fibers. For example, the present inventors proposed an all fiber having a cross section as shown in FIG. 4 in Japanese Patent Publication No. 48-28005.

When a filament with such a cross section is mechanically opened, the segments are dispersed and a bulky fabric is obtained, but when the radial polymer is dissolved and removed, the split remaining segments tend to bunch together. Therefore, bulkiness tends to be poor and it is difficult to obtain a soft texture. A similar matter is described in Japanese Patent Publication No. 61-37369. That is,
A cross section like that shown in Figure 5 is shown, and ``When one component is removed from this composite A-fiber fabric, the boundary between one component and the other component is found in the composite fiber fabric as shown in the figure. The boundary surface almost becomes the boundary surface between the four components of the other component, and the components of the other component come into surface contact, as if they were a single thread.・
Its drawbacks have been pointed out as "It has an extremely hard texture." In addition, as a method for improving this, it is stated that there is "substantially no linear portion at the boundary between one component and the other component..." and a filament is proposed in which the remaining segments do not substantially come into surface contact. ing. Although it is certainly preferable in that the segments do not come into surface contact with each other, the degree of freedom of each segment is small and is still constrained, so there is room for improvement.

<Problems to be Solved by the Invention> The present invention improves the drawbacks shown in the prior art as described below, namely, the drawback that the remaining segments after dissolving and removing one of the polymers tend to converge, and provides a soft texture with bulky rust. The purpose of this invention is to propose a split-fiber composite fiber that can yield a fabric of.

<Means for solving the problems> The i! of the present invention! The i'lJa composite fiber is a composite fiber in which a fiber-forming polymer is divided into one or more segments by a polymer having higher solubility than the 6M1-forming polymer in the cross section of the filament, ) one of the segments is a core segment that occupies almost the center of the filament; (a) the remaining six or more petal-like segments are arranged around the core segment so as to surround the core segment; c) each individual The blended yarn of the present invention is characterized in that at least a part of the petal-shaped segments occupies the surface of the filament, and the blended yarn of the present invention is a blend of a plurality of the above-mentioned flexible composite fibers having different water production shrinkage rates of 5% or more. It is made up of intertwined fibers.

The present invention will be explained below with reference to the drawings.

Figure 1 shows an example of the cross section of the composite fiber of the present invention, in which the I-group forming polymer is divided into nine segments (1) and (2) by the highly soluble polymer (3). . Segments are divided into two types. One is a core segment (1) occupying approximately the center of the cross section, and the other is a petal-like segment (2) arranged to surround the core segment.

The role and effect of the core segment (1) will be described below. First, the core segment (1) is used to prevent the petal-shaped segments (2) from gathering in the center and causing volume reduction and impairing the texture when a highly soluble polymer is dissolved and removed. Because of the presence of the core segment (1), the petal-like segments (2) do not gather in the center (and the degree of freedom of each petal segment is maintained, resulting in a bulky and soft texture. Experiments conducted by the inventor) According to the core segment (1
) should be at least equal to or larger than the size of the individual petal segments, and if the core segment is small, it will not be much different from the fiber of only the petal segment without the core segment shown in Figure 1. understood.

Second, in the case of m-tsumugi provided with the core segment (1), the time required for dissolving polymers with high solubility after fabrication is short. In practical use, when polyethylene terephthalate copolymerized with PEG and/or 5-sulfoisophthalic acid is used as a highly soluble polymer and the 4iI fibers are split by alkaline hydrolysis, the dissolution treatment time can be shortened. This is advantageous because less weight loss of polyethylene terephthalate is required.

Actually, what is the cross section like in Figure 3, and one in which the core segment is four times the size of one petal-like segment, and one in which the I! When the alkali splitting time of fibers having an fr surface was compared, the splitting time of the fibers according to the present invention was about half. For this purpose, larger core segments are preferred.

Thirdly, by changing the size of the core segment, the fabric using Buddha fiber according to the present invention can adjust the tension and waist of the fabric according to the purpose, and the soft touch can be achieved by using petal-shaped segments. can be kept. For example, in Figure 1, if the core segment is set to 0.7 d or more, especially 2 to 5 d, and the petal segment is set to 0.1 to 0.5 d, it will have a silk-like moderate tension and waist, and will also have bulk and softness. You can get fabrics with different textures.

A mixed anchor fabric with thick fibers has been proposed for the same purpose;
In this case, both fibers are generally biased, and the fabric after dyeing often looks like a dyed method. On the other hand, the fabric made of the W4 fiber of the present invention has core segments and petal-like segments evenly distributed, so it does not look dyed (this is advantageous). The size of the petal segment is preferably 2 to 15 times the size of one petal segment, and often 4 to 10 times the size of one petal segment.

Next, the petal-like segments will be described. The petal-like segments are distributed surrounding the core segment, with each segment occupying at least a portion of the filament surface. In order to obtain the bulkiness and soft texture that are the objectives of the present invention, the number of petal segments must be 6 or more, preferably 20 or less, particularly 8 to 16.
Individuals are often preferred.

The ratio of the plurality of petal-like segments occupying the filament surface is preferably 50% or more, and particularly preferably 70% or more.

Polymers with high solubility generally have a lower softening point than fiber-forming polymers (and have higher water absorption and oil absorption properties, so filaments tend to stick together during the production process. In particular, polymers with high stickiness When used, it is often preferable that the petal segments occupy as large a proportion of the filament surface as possible, for example 70% or more.

The shape of the petal segments is often preferably a bulging fan shape as shown in FIG. 1 or a trapezoid as shown in FIG. 2. The sizes of the individual petal-like segments that make up one filament may be the same or may vary. However, when changing the size of individual petal segments, it is often preferable for production to change them so that they are rotationally symmetrical as shown in FIG.

As the fiber-forming polymer that can be applied to the core and petal segments, known polymers having fiber-forming ability, such as polyamide, polyester, and polyolefin, are useful. Examples of polyamide include nylon 6, nylon 66, nylon 11, nylon 12. nylon 61
0 and copolyamides containing these as main components are well known, and polyesters include, for example, polyethylene terephthalate and polybutylene terephthalate.

Polyethylene oxybenzoate, poly 1-4 dimethylcyclohexane terephthalate, polypiparolactone, and copolyesters containing these as main components are well known, and polyethylene, polypropylene, etc. are well known as polyolefins. Polymers other than those mentioned above can also be applied to the present invention as long as they are fiber-forming polymers.

A highly soluble polymer can be easily selected in consideration of its combination with the texture-forming polymer.

When the fiber-forming polymer in the core and petal parts is polyamide, polyester, or polyolefin, the polymer with high solubility may be a copolymerized polyester with high alkali hydrolyzability, such as polyalkylene glycol or other than terephthalic acid having a metal sulfonate group. Polyethylene terephthalate copolymerized with one or two dicarboxylic acids is useful. Also useful are polyesters, polyamides versus polyolefins, polyesters, polyolefins versus polyamides, and the like. Furthermore, water-soluble (including hot water-soluble) polymers are versatile and often preferred. Useful water-soluble polymers include polyoxyethylene, polyvinyl alcohol, and aqueous polyamide. Polyoxyethylene is often preferably one having a relatively large molecular weight, for example 10,000 parts or more, particularly 50,000 parts or more, and polyvinyl alcohol preferably has a melting point of about 150 to 180°C. Examples of water-soluble polyamides include polyamides made of diamine and carboxylic acid in which one or both ends of the piperazine groove are alkylaminated, and polyamides copolymerized with lactam or the like. For example, N, N'
Polyamides made of bisaminopropyl biperazine and adipic acid are soluble in hot water and are often preferred.

Next, an example of the method for manufacturing the composite fiber of the present invention will be described. FIG. 6 is an explanatory view of a part of the longitudinal cross-section of the cap pack, showing the place where the fiber-forming polymer and the highly soluble polymer B meet in the cap pack, and FIG. 1 is an x-7 view thereof. It is a diagram. The polymer man is extruded through an internal core orifice (4) and a plurality of internal petal orifices (5) shown in FIG.

- Polymer B, which has a high disintegration property, passes through the flow path (6) in Fig. 7, flows into the meeting area of both polymers, and after meeting with polymer A coming out from the internal orifice, the polymer B passes through the channel (6) in Fig. 7, and after meeting with polymer A coming out from the internal orifice, (
1) and is discharged from the orifice (8). The size of the core segment and petal segment is determined by the internal orifice (4
) and (5) can be changed freely by changing the inner diameters.

The above-mentioned splittable composite fibers may be used alone or in combination with other fibers, but in particular, when obtaining a texture with excellent volume, it is recommended to use them in combination with fibers with a light heat shrinkage rate. is preferred. In such a case, a mixed fiber yarn is used in which a plurality of split-uniform composite aIIfAs having different thermal histories are mixed and entangled with a fluid such as air. A sufficient differential shrinkage effect cannot be obtained unless the difference in water swelling and shrinkage rate of the splittable composite W4 fibers due to the difference in thermal history is 5% or more.

Further, the fineness of the high shrinkage composite yarn is preferably 1.2 denier or more, and the fineness of the low shrinkage composite yarn to be combined with the same series is preferably about 115 to 1/2 that of the high shrinkage composite yarn.

Further, the woven conjugate fiber may be subjected to false twisting, and a more flexible texture can be obtained by this processing. The false twisting processing conditions may be the usual ones, such as a heater temperature of 180 to 21
It may be used at a temperature of about 0°C and a twist number of 3000 T/MIn. In addition, when a mixed fiber yarn with different shrinkage is used as described above, the low shrinkage yarn may be subjected to a false twisting process.

<Example> This will be explained in more detail below with reference to Examples.

Example 1 Intrinsic viscosity [η] (polyethylene terephthalate having a measurement value of 064 in a mixed solution of phenol-tetrachloroethane 6:4 at 20°C is used as polymer P1. 20°
1 in a 6:4 mixed solution of C phenol tetrachloroethane
Polyethylene glycol (average molecular weight 3.000) with a relative viscosity of 2.01% when dissolved (average molecular weight 3.000) and 17% copolymerized polyester is used as Polymer P! shall be.

Polymer P1 at 295″C1 Polymer P! at 290°C
After melting the bath in a separate screw extruder and weighing it with a gear pump so that the bonding ratio becomes P+/Pt = s/1<capacity ratio), use a nozzle as shown in Figs. 6 and 7 of 292"C. It is guided into the pack, combined, and pushed out from the orifice to release 1
The filament F1 was wound up at a speed of 000772/min, then stretched 3.5 times with a hot roller at 85°C, and heat-treated in contact with a hot plate at 150°C to obtain a filament F1 of 100 d/25 f.

The filament F1 has a cross section as shown in Fig. 1, and the polymer P1 is divided into segments (1) and (2) from the polymer P2.
). As determined from the cross-sectional photograph of filament F1, the core segment was equivalent to 0.8 d, and the petal segment was equivalent to 0.28 d.

For comparison, the polymer P1 and the polymer P! A 100 d/25 f composite filament Ft having a bonding ratio of P1/Pt = 5/1 and a cross section as shown in FIG. 4 was prepared using the following method.

Next, filament F1 and filament F! Both warp and weft are used for each, 100 warps/1nch.

Weaving taffeta with 80 wefts/inch, fabrics W1 and W
l? Uta. These were smoked in a 1% NaOH aqueous solution at 98°C.
The polymer P1 was eluted by treatment with water, followed by washing with water and drying.

The results are shown in Table 1. As can be seen from Table 1, the presence of the flower core segment made it possible to obtain a fabric that was soft, bulky, and stiff.

Also, Polymer P! It was found that the elution time was also short.

Table 1: Excellent. △Slightly inferior. ×Inferior Example 2 Polymer P1 and polymer P2 used in Example 1 were each melted in a bath, and the bonding ratio was P+/Pt = 3/1 (capacity ratio)
The filament was introduced into a spinneret pack as shown in FIGS. 6 and 7 for composite spinning, extruded through an orifice, and wound up to 1,000 m in 1 minute.
An undrawn yarn of ysa/12r was obtained. When blending these two undrawn yarns while drawing, the drawing ratio is 3.5 times, the drawing hot roller is the same at 85°C, and the heat treatment temperature is fixed at 190°C for one yarn and 190°C for the other. 150-C, 100"
The C9 mixture was liquefied at room temperature, and after stretching, the interlace bonding treatment was applied at an air pressure of 2 atmospheres while winding the yarn to obtain three types of different shrinkage mixed composite yarns.

The three types of mixed yarns thus obtained were used for the warp and weft respectively, and taffeta with 100 warps/1 nch and 80 wefts/1 nch was produced to obtain woven fabrics W1 to V6. These were treated with a 1% by weight NaOH aqueous solution at 98°C to produce Polymer P! After elution, it was washed with water and dried. The results are shown in Table 2.

The difference in water shrinkage rate can be determined by stretching heat treatment (190"C, 15"C).
It is the difference in the water swelling and shrinkage ratio of yarns heated at 0-C, 100°C and 9 room temperature.

The woven fabric using the different shrinkage mixed fiber yarn of the present invention, which is made of splittable debonded fibers, had a more fluffy feel. The water production shrinkage rate difference is 5
% or more is preferable.

Example 5 Undrawn yarns 420d/24f, 3 with the same cross section as filament 1 of Example 1 using polymer P1 and polymer P2
50d/20f, 280d/16f, 210 (1/12
I created f. On the other hand, undrawn yarn 70d/12f with a triangular cross section made of polymer PI alone.

140a/24f, 140d/32f, 210d/J
6 f' was created. When the undrawn yarn of the splittable composite A fiber and the undrawn yarn of polymer P1 alone are mixed while being stretched at a draw ratio of 5.5 times and a hot roller temperature of 85°C, the 0 degree of the mixed D yarn is 120D. In addition, the splittable composite yarn was heat treated at 190"C, and the polymer P1 single yarn was drawn without heat treatment, and the interlace entangling process was performed at 2 atmospheres of air pressure while the yarn was wound up. The degree of frustness of the obtained mixed fiber yarns was 12Qa.

Each of the obtained mixed fiber yarns was used as warp and weft, and 90 warps/weft were used.
Taffeta of 1 nch + 80 wefts/1 nch was produced to create fabrics W8 to W1G. Example 1.2 below
Polymer P2 was dissolved and removed in the same manner as above, washed with water, and dried. The results are shown in Table @3. By blending a single yarn with a diameter exceeding 1.1 d and a high bottom margin shrinkage rate of -5 or higher, a feeling of firmness and firmness is achieved in addition to a fluffy feeling.Also, splittable composite yarn and single yarn If the ratio exceeds 1:0.5 in terms of fineness ratio, flexibility tends to be impaired.

Example 4 Polymer P1 and Polymer P! The undrawn yarn 2 of the splittable composite fiber with the same blood cutting as the filament 1 of Example 1 was prepared using
After creating 80cl/18f and stretching to a stretching ratio of 3.5 times, the heater temperature was 180°C and the number of twists was 2,700T/M.
The material was false-twisted. A drawn yarn 40 with a triangular cross section is made of the false twisted yarn 80d/18f and the polymer P1 having a water production shrinkage rate of 15%.
A/24 f was interlaced and entangled at an air pressure of 2 atmospheres.

The obtained mixed fiber yarn was woven, treated with alkali, washed with water, and dried in the same manner as in Example 3. The obtained woven fabric was more flexible than the woven fabric Wl.

[Brief explanation of the drawing]

1 to 3 are cross-sectional views of conventional melt-split type composite fibers, and Figures 4 and 6 are cross-sectional views 7 of melt-split type composite m-fibers of the present invention.
6 and 7 show an example of the internal structure of the cap used in the present invention.・)

Claims (2)

[Claims] (1) A composite fiber in which the fiber-forming polymer is divided into seven or more segments in the cross section of the filament by a polymer with higher solubility than the fiber-forming polymer, and a) one of the segments. is a core segment that occupies approximately the center of the filament; (b) eight or more remaining petal-like segments are arranged around the core segment so as to surround the core segment; and (c) at least one of the individual petal-like segments is A splittable composite fiber characterized in that a portion of the filament occupies the surface of the filament. (2) A mixed yarn formed by intertwining a plurality of splittable conjugate fibers according to claim 1, which have different boiling water shrinkage rates by 5% or more.