JPH1096139A - Fabric improved in wrinkle processability - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject fabric, good in retention of wrinkles, capable of forming sharp wrinkles and excellent in casual appearance and touch feeling by including a specific core-sheath type conjugated fiber comprising an elastic polymer as a core component and a polyester polymer as a sheath component therein. SOLUTION: This fabric comprises a core-sheath type conjugated fiber comprising an elastic polymer such as a block copolymer polyether polyester containing a polybutylene terephthalate-based polyester as a hard segment and a polyoxybutylene glycol-based polyether as a soft segment as a core component and a polyester polymer as a sheath component at (15/85) to (65/35) ratio of the core component to the sheath component. The wrinkle retention characteristics are preferably >=4 rating. The fabric is preferably a knitted fabric.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fabric having improved wrinkle workability.

[0002]

2. Description of the Related Art Among synthetic fibers, particularly polyester is
From the beginning of its industrial production, 3W (Wrinkle)
free, Wash & Wear, Work sa
wing), and wrinkles (pleats) once applied are hardly removed by a permanent press, and generally, wrinkles are not easily worn.

[0003] However, consumers' tastes have diversified, and wrinkles have become an important post-processing method in order to create a casual appearance, worn out feeling, and natural-like texture, which has been regarded as a drawback in the past and has become one of fashions. .

On the other hand, except for some synthetic fibers including fine denier, ordinary polyesters and the like are difficult to impart random wrinkles and sharp wrinkles. It was very difficult to apply wrinkles.

[0005] In order to solve such a problem, there is known a method of embossing a knitted fabric by embossing with a mold having a regular pattern or a turtle pattern randomly arranged, but wrinkles are not yet obtained. Artificial and sharpness is not satisfactory.

[0006] Other wrinkling methods other than the above include twisting the entire knitted fabric or simply steam setting in a bundled state to apply vertical wrinkles. There is a method of setting and fixing the strength of wrinkles in a stepwise manner, or a method of applying a buckling wrinkle by pushing a knitted fabric into a dyeing machine or a cylinder and increasing the pressure and temperature, In fact, sharpness is still lacking, and no elegant wrinkles have been realized.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the wrinkle processability of such a conventional synthetic fiber, and to provide a sharp, random, high-grade wrinkled fabric, particularly in a knitted fabric of polyester. It is an issue.

[0008]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, have found that a fabric containing a core-sheath type composite fiber having an elastic polymer as a core component and a polyester polymer as a sheath component has been obtained. When wrinkling, it was determined that folds having good wrinkle retention could be provided, and the present invention was completed.

That is, according to the present invention, there is provided (1) a fabric comprising a core-sheath type composite fiber having an elastic polymer as a core component and a polyester polymer as a sheath component, and having a wrinkle retention property defined by the following method. Wrinkled workability-improved fabric characterized by being a class 4 or higher, (Wrinkle retention measuring method) A test fabric 8 cm long and 25 cm wide is sewn into a cylindrical shape so that the long side is circular. . At this time, 1 from the short side
cm to the seam allowance.

[0010] A cylindrical test cloth is passed through a columnar tester arranged in a substantially vertical direction, and a circular load of 4 kg is applied thereto so as to be stuck to the cylindrical tester, and the test cloth is crimped for 30 minutes.

After removing the weight, the sewing thread of the test cloth is unwound, and the wrinkle retention after standing for a predetermined period of time is sensory evaluated according to the following criteria. First-class wrinkles are hardly recognized. Level 2 Slight wrinkles are observed. Wrinkles are observed throughout the third grade fabric. Grade 4 Many wrinkles are observed. Grade 5 Many clear wrinkles are observed.

(2) The improvement in wrinkle workability as described in (1) above, wherein the elastic polymer is a block copolymerized polyether polyester having a polybutylene terephthalate-based polyester as a hard segment and a polyoxybutylene glycol-based polyether as a soft segment. Fabric,
(3) A fabric having improved wrinkle workability according to the above (1) or (2), wherein the fabric is a knit.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The polymer constituting the core component of the core-sheath type conjugate fiber used in the present invention is not particularly limited as long as it is an elastic polymer, but has good compatibility with the polyester of the sheath component. Further, those having substantially the same dyeing property as the sheath component are preferable.

Specifically, a block copolymer polyether polyester having a polybutylene terephthalate-based polyester as a hard segment and a polyoxybutylene glycol-based polyether as a soft segment is 13%.
It is preferable because it can be dyed with a disperse dye at 0 ° C.

Examples of the polymer constituting the sheath component include polyesters containing terephthalic acid as a main acid component and at least one glycol, preferably an alkylene glycol such as ethylene glycol and trimethylene glycol as a main glycol component. Of these, polyesters containing polyethylene terephthalate as a main component are preferred.

Here, the ratio between the core component and the sheath component of the core-sheath type conjugate fiber must be in the range of 15:85 to 65:35.

When the ratio of the core component is less than 15%, wrinkle retention is good up to 3 hours after wrinkling, but the wrinkles disappear over time. On the other hand, when the ratio of the core component is 65
%, The strength does not reach the practical level as clothing and cannot be used.

It is generally known that it is difficult to impart sharp wrinkles to a knitted fabric as compared to a woven fabric. The difficulty increases as the fineness of the yarn constituting the knitted fabric increases and the basis weight increases.

The reason for this is that wrinkling means that plastic deformation is caused by causing strain due to stress concentration exceeding the elastic limit at a specific portion of the yarn constituting the fabric, and the knitting of the knitted fabric is unavoidable. In this case, since the structure is composed of loops, the entanglement between the yarns is looser than that of the woven fabric, so that it is considered that the stress concentration hardly occurs at one portion of the yarn. This can be easily understood from the fact that a knitted fabric that has lost flexibility due to a hard texture finish with a resin or the like is likely to have broken lines temporarily.

Further, when the fineness is large, the intensity of stress concentration per unit denier (fineness) decreases, so that it is considered that stress concentration hardly occurs.

In the present invention, since a core-sheath type composite fiber having an elastic polymer as a core component and a polyester polymer as a sheath component is used as a constituent component of a fabric, it can be used for knitted fabrics which have conventionally been difficult to wrinkle. Wrinkles can be applied.

Although the details of the reason are not yet known, the stress concentration due to a larger compressive force is applied to the sheath inside the bent portion when the conjugate fiber is folded due to the arrangement of the flexible elastic polymer at the core. It is thought that this may be caused.

[0023]

The present invention will be described in more detail with reference to the following examples. The physical properties in the examples were measured by the following methods.

(1) Wrinkle Retention A test cloth having a length of 8 cm and a width of 25 cm is sewn in a cylindrical shape so that the long sides are circular. At this time, 1 from the short side
cm to the seam allowance.

As shown in FIG. 1, a cylindrical test cloth is passed through a cylindrical tester arranged in a substantially vertical direction, and a circular load of 4 kg is applied to the test cloth so that the test cloth is stuck to the cylindrical tester. Perform wrinkling.

After removing the weight, the sewing thread of the test cloth was unwound and
The wrinkle retention after leaving for hr, 24 hr and 72 hr is sensory-determined according to the following criteria. First-class wrinkles are hardly recognized. Level 2 Slight wrinkles are observed. Wrinkles are observed throughout the third grade fabric. Grade 4 Many wrinkles are observed. Grade 5 Many clear wrinkles are observed.

(2) Wrinkle Sharpness In the wrinkle retention test, the sharpness of wrinkles after standing for 72 hours is sensoryly evaluated in three stages of ○ (good), Δ (slightly poor), and × (poor).

Examples 1-3, Comparative Examples 1-3 Block copolymerized polyether polyester having a polybutylene terephthalate-based polyester as a hard segment and a polyoxybutylene glycol-based polyether as a soft segment as a core component, polyethylene A Kanoko knitted fabric was knitted using a 75 denier / 24 filament core-sheath composite yarn having terephthalate as a sheath component and a 75 denier / 24 filament polyethylene terephthalate yarn.

At this time, the ratio between the core component and the sheath component is shown in Table 1.
Was changed from 10:90 to 70:30 as shown in FIG.

For comparison, a Kanoko knitted fabric was similarly formed using two 75 denier / 24 filament polyethylene terephthalate yarns.

Table 1 shows the strength of the obtained yarn, the wrinkle retention of the knitted fabric, and the sharpness of the wrinkles.

As is evident from Table 1, when the core-sheath type composite fiber containing the elastic polymer as the core component was not used (Comparative Example 1), the initial (after 3 hours) wrinkle retention was poor. After 72 hours, the wrinkles almost disappeared.

On the other hand, when a core-sheath composite fiber having an elastic polymer as a core component is used, the initial wrinkle retention is good, but the ratio of the core component to the sheath component is 10:90 (Comparative Example). In 2), wrinkles disappear over time. Furthermore, as the ratio of the core component increases, the yarn strength decreases, and when the ratio of the core component to the sheath component exceeds 65:35 (Comparative Example 3), the yarn strength decreases to a level that no longer has practical strength as clothing.

Example 4 Example 4 was carried out in the same manner as in Example 1 except that the structure of the knitted fabric was changed to tricot.

Table 1 shows the strength of the obtained yarn, the wrinkle retention of the knitted fabric, and the sharpness of the wrinkles.

Example 5, Comparative Example 4 A plain woven fabric was woven using the core-sheath type composite fiber yarn and the polyethylene terephthalate yarn used in Example 1.

For comparison, a plain weave was similarly woven using two 75 denier / 24 filament polyethylene terephthalate yarns.

Table 1 shows the strength of the obtained yarn, the wrinkle retention of the woven fabric and the sharpness of the wrinkles.

[0039]

[Table 1]

[0040]

According to the present invention, wrinkle retention is good,
Also provided is a fabric having improved wrinkle workability capable of imparting sharp wrinkles, and can provide a casual appearance and a natural-like feeling of used clothes, especially when used for clothing.

[Brief description of the drawings]

FIG. 1 is a side view showing an apparatus for measuring wrinkle retention.

[Explanation of symbols]

 1 Test cloth 2 Load 3 Cylindrical tester

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mitsuo Mizuki 1-6-7 Minamihonmachi, Chuo-ku, Osaka-shi, Osaka Teijin Limited

Claims (3)

[Claims] An elastic polymer having a core component and a polyester polymer having a sheath component, wherein the ratio of the core component to the sheath component is 1
What is claimed is: 1. A fabric comprising a core-sheath type composite fiber having a wrinkle retention of 4th grade or more as defined by the following method, wherein the fabric has improved wrinkling workability. (Method of Measuring Wrinkle Retention) A test cloth of 8 cm in length and 25 cm in width is sewn in a cylindrical shape so that the long sides are circular. At this time, 1 from the short side
cm to the seam allowance. The cylindrical test cloth is passed through a columnar tester arranged in a substantially vertical direction, and a circular load of 4 kg is applied so as to stick to the cylindrical tester, and the test cloth is crimped for 30 minutes. After the removal of the weight, the sewing thread of the test cloth is unwound, and the wrinkle retention after standing for a predetermined time is subjected to a sensory evaluation according to the following criteria. First-class wrinkles are hardly recognized. Level 2 Slight wrinkles are observed. Wrinkles are observed throughout the third grade fabric. Grade 4 Many wrinkles are observed. Grade 5 Many clear wrinkles are observed. 2. The improved wrinkling process according to claim 1, wherein the elastic polymer is a block copolymerized polyether polyester having a polybutylene terephthalate-based polyester as a hard segment and a polyoxybutylene glycol-based polyether as a soft segment. Fabric. 3. The fabric as claimed in claim 1, wherein the fabric is a knit.