JP4123394B2 - Anti-pill polyester spun yarn - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a polyester composite spun yarn. More specifically, the present invention relates to a composite spun yarn with high practicality, characterized in that the surface layer is composed of anti-building polyester short fibers, the core portion is composed of polyester short fibers having higher strength than the surface short fibers, and polyester multifilaments.
[0002]
As is well known, polyester fiber has expanded its marketability from natural fibers such as cotton and wool due to its strength, lightness, easy care, dyeing fastness and the like. In the case of the short fiber form, the appearance is natural, soft texture and gentle to the skin, but the disadvantage due to its high strength, that is, poor pilling property significantly impedes its practicality, and its market expansion is still insufficient. There was a limit to the development of uniforms that require strong pill resistance as well as fabric strength, especially for school uniforms, and knit fields that are weaker in terms of yarn binding than fabrics, especially for sports and inner use.
[0003]
For this reason, polyester fiber and cotton blend products are still mainstream in these fields of application. For outdoor underwear, a 100% polyester product is essential due to its immediate drying, but there are no products that satisfy pilling performance. In recent years, the functionality of polyester fibers, particularly sweat perspiration and quick drying, has been reviewed in the sports field, but 100% polyester short fibers are not very popular because of insufficient pilling or high price. The emergence of polyester staple fibers having both anti-pill properties and strength suitable for these fields is desired.
[0004]
As a means for improving the pilling property, a method of decreasing the yarn strength, particularly the knot strength, and facilitating the removal of the short fiber fluff from the fabric surface when a physical force is applied. As a method for reducing yarn strength, there are a raw yarn manufacturing method, a method by chemical treatment of raw cotton to spun yarn, and fabric.
[0005]
Although low-strength raw cotton is relatively easy to manufacture, it has the disadvantage of poor processability due to its low strength. That is, the spinnability is poor, the fine yarn cannot be spun, and the spun yarn strength is inferior, so it cannot withstand the acid and alkali treatment conditions in the practical dyeing process, and the tear strength and abrasion resistance of the fabric are significantly reduced. Lack of practicality. Further, since the raw cotton itself is yellowish, it has a drawback that it is difficult to obtain a clear color. In the case of raw cotton yarn having normal strength, a decrease in strength due to acid and alkali in the fabric processing step can be expected, but the processing conditions are remarkably limited depending on the configuration of the fabric such as woven fabric, knit, and used material, and lacks versatility.
[0006]
As these improvement methods, blended cotton blended yarn of anti-pill-resistant polyester short fiber and normal strong polyester fiber, sliver blended fine spinning blended yarn, and blended yarn can be considered. The resulting mixed fiber spots cannot be resolved, and stable practical living performance has not been achieved.
[0007]
[Problems to be solved by the invention]
An object of the present invention is to solve the above-mentioned problems in the prior art and to provide an ideal polyester two-layer structure yarn having both high anti-pill performance and practical strength characteristics.
[0008]
[Means for Solving the Problems]
Means for solving the above-mentioned problems, that is, the first aspect of the present invention is a composite spun yarn that becomes a core-sheath structure yarn when subjected to a liquid heat treatment at 120 ° C. or higher, and the composite spun yarn before the liquid heat treatment has a SHW of 130 ° C. Single fiber strength 3.6 to 4.6 g / d polyester fiber (A) having a low shrinkage characteristic of 2.5% or less and single fiber strength 4.0 to SHW 130 ° C. of 40% or more 6.0 g / d of polyester fiber (B) is compounded in a weight ratio of 25 to 75:75:25, and SHW 130 ° C. of the composite spun yarn is 12% or more. It is a polyester composite spun yarn, the second of which is an anti-pill polyester composite spun yarn according to claim 1, wherein the polyester fiber (B) is a short fiber having a hollowness of 5 to 35%, the third of which is Polyester fiber (B) is multi An anti-pill polyester composite yarn of claim 1 wherein the Iramento.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
As the polyester short fiber (A) used in the present invention, a polyester fiber having a single fiber strength of 3.6 to 4.6 g / d is used because anti-pill property is required. Furthermore, it is necessary that the short fiber has a SHW of 130 ° C. of 2.5% or less, preferably 2.0% or less, the single yarn denier is 0.5 to 4.0 d / f, and the mixing ratio is 25 to 75%. preferable. If the single fiber strength is 3.6 g / d or less, the practical strength is not obtained, and if it is 4.6 g / d or more, the anti-pill property is insufficient, which is not preferable. When the SHW 130 ° C. is 2.5% or more, the shrinkage difference from the mixed yarn becomes small and it is difficult to obtain a core-sheath structure yarn. When the single yarn denier is 4 d / f or more, the texture is too hard. When the mixing ratio is 25% or less, the anti-pill property of the composite yarn is inferior, and when it is 75% or more, strength cannot be obtained.
[0010]
The SHW 130 ° C. of the high-shrinkage polyester fiber (B) used in the present invention is 40% or more, preferably 50% or more. In the case where the cut length is 70 mm or more, a good structural yarn can be obtained when the SHW 130 ° C. is 40% or more from the strength of the contraction force compared to 38 mm, but 50% or more is preferable at 38-50 mm. When the SHW 130 ° C. is 40% or less, the shrinkage force is weak and a good composite yarn cannot be obtained. A clear core-sheath structure yarn is obtained with a higher shrinkage rate. In the present invention, a PET type not containing isophthalic acid having a shrinkage rate at SHW of 130 ° C. and SHD of 180 ° C. smaller than SHW of 100 ° C. is excluded. The reason is that polyester fibers are usually dyed at 130 ° C., and the shrinkage at that time is an important factor constituting the two-layer structured yarn. In addition, it is necessary that the fiber maintain the potential shrinkage force that shrinks even in the Korean heat setting process. The composite yarn has a shrinkage of 130 ° C. at SHW depending on the mixing ratio, but it is required to be 12% or more for the composite yarn of the present invention and 13% or more at SHW 180 ° C. The single fiber strength of the highly shrinkable fiber is 4.0 to 6.0 g / d. If it is 4.0 g / d or less, the composite yarn has insufficient strength, and if it is 6.0 g / d or more, it is difficult to obtain a high shrinkage yarn. The strength difference from the anti-pill short fiber is preferably 0.5 g / d or more. The single fiber denier is 1-6 d / f, preferably 1.2-5.0. If it is 1 d / f or less, the shrinkage force is inferior, and if it is 6 d / f or more, the shrinkage force is increased, but a hard texture is not preferable.
[0011]
The fiber form of the polyester is not limited, but short fibers are rich in bulky, and multifilaments can obtain a composite yarn having a fine count compared to the short fiber form from the strong side. The cross-sectional shape is not particularly limited, and the hollow shape is light and moisturizing, and the added value increases. In addition, the cross-section shape can be triangular, the star shape can increase tension and waist, and the flat shape can add softness. As additives, known substances and amounts such as titanium oxide and antibacterial agents are employed. Known methods such as blended cotton blend, sliver blend, blended blend and the like can be used for blending and blending. The coefficient of engagement is preferably 3.5 or more, and 4.0 or more is preferable for Sara. If it is 3.5 or less, a so-called breakage phenomenon in which highly shrinkable fibers appear on the surface of the yarn during heat treatment is not preferable. When a twist set is required, the potential shrinkage of the composite yarn can be maintained at a low temperature set of 75 ° C. or lower.
[0012]
【Example】
Next, the present invention will be described in detail by way of examples and comparative examples. The measurement method used for the evaluation of the present invention is as follows.
[0013]
SHW 130 ° C Measurement Method JIS L1095 C Method (Single Yarn Shrinkage)
According to However, the immersion humidity is 130 ° C x 10 minutes.
Example 1 (by blended cotton blending method)
Anti-pill modified polyester short fiber (PET containing 3% GCM) 38mm cut length, SHW 130 ° C 1.90%, single fiber denier 1.4d / f, single fiber strength 4.0g / d, high shrinkage polyester short fiber High-shrinkage polyester short fibers made of PET containing 38% cut length, SHW 130 ° C 61%, single fiber denier 2.0d / f, single fiber strength 5.8g / d 10% isophthalic acid, 35% and 65% respectively. The fibers were mixed in a normal blended cotton process to obtain a 40-yarn ring spun yarn having a strength of 338 g (twisting coefficient K3.5). The composite yarn showed 15% at SHW 130 ° C. and 21% at SHD 180 ° C. Using the blended yarn, a smooth knitted fabric having a basis weight of 240 g / square m was obtained. The knitted fabric is subjected to liquid refining at 70 ° C. for 20 minutes (only soda ash 2 g / l), and then dyed in a liquid dyeing bath at 130 ° C. for 30 minutes, which is a general cationic polyester fiber dyeing condition, at a pH of 4.5. And air-dried on a wire mesh. At first glance, the knitted fabric was plain. The composite yarn thus knitted exhibited a two-layered yarn having a yarn strength of 296 g (yarn strength reduction rate 12.4%) in which the surface layer portion was dyed yarn and the core portion was undyed yarn. The physical properties of the knitted fabric satisfy the ICI pilling test (10 hours) result of grade 4, abrasion resistance is 20,000 times or more by the Martindale method, rupture strength is 6.3 kg (19.2% compared to untreated fabric) A satisfactory result for practical use was obtained. The present invention is excellent in easy care properties such as pilling, strong, sweat absorption, quick drying, etc., and since a high-density fabric can be easily obtained, it is excellent in windproof and moisture retention, and sports that require severe physical properties, It turned out to be a composite yarn suitable for outdoor and inner use.
[0015]
Example 2 (by manard blending method)
In a spinning process using only the same anti-pill-modified polyester short fibers as in Example 1, 50% multifilament yarn SHW 130 ° C. 51%, single fiber strength 4.7 g / d, single fiber denier 4.2 d / f, a high-shrinkage polyester fiber having a hollow ratio of 30% was electrically opened, and blended with the short fiber in the spinning process to obtain 40 single-spun spun yarn having a yarn strength of 392 g (K4. 5, SHW 130 ° C. is 15%). The blend ratio of the short fibers was 64%. Thereafter, the same process as in Example 1 was passed. The knitted fabric was darker in color than Example 1 and had a silky appearance, and was excellent in resilience, lightness and heat retention. Similarly, the knitted dyed yarn exhibited a two-layer structured yarn in which the surface layer was dyed and the core was undyed. The composite yarn had a yarn strength of 322 g (reduction rate of 18%), which was superior to the composite yarn of Example 1. The pilling performance also showed the fourth grade, indicating the superiority of the present invention.
[0016]
Example 3
Strong under the same conditions as in Example 2 except that the high shrinkage polyester multifilament yarn is 50d, the single fiber denier is 1.0 g / f, and the single fiber strength of the anti-pill modified polyester short fiber is changed to 4.4 g / d. A finely spun composite yarn of 50 single yarns having 361 g and an anti-pill polyester short fiber mixture ratio of 58% was obtained (k3.2, SHW 130 ° C 13%, SHD 180 ° C 14.5%). The yarn strength measured by passing the same process as in Example 1 and knitting the yarn from the dyed fabric was 277 g (a reduction rate of 23%), which was practically useful for expressing a thin and comfortable fabric that was impossible until now. It was found to be a composite yarn rich in nature.
[0017]
Comparative Example 1
The yarn strength of the 40 single yarn fine spinning yarn composed only of the anti-pill modified polyester short fiber shown in Example 1 and produced under the same process conditions was 268 g, and SHW 130 ° C. was 2%. The strength of the yarn knitted from the dyed fabric was 195 g, which showed a significant decrease in strength (reduction rate of 27%). This is presumably because the anti-pillar polyester short fiber was significantly hydrolyzed in an acidic bath of pH 4.5. Although the knitting fabric showed a 4-5 grade, the burst strength was 5.4 kg / square cm (26% decrease with respect to the untreated fabric) and the wear resistance (Martindale method) was 10,000 times poor. . Redyeing the knitted fabric causes a further 26% strength loss, i.e. reworking is impossible. Even if the spun yarn is 30th or more and the wear resistance is improved, the non-lifted product cannot be reprocessed, resulting in high product cost. That is, it was lacking in practicality.
[0018]
Comparative Example 2
Blended cotton method: Same as Example 1 except that the normal polyester short fiber has a single fiber strength of 5.5 g / d and SHW 130 ° C. of 1.1%. The yarn strength is 384 g which is a blended yarn with anti-pill short fiber. A 40th single yarn was obtained (K3.5, SHW 130 ° C. 1.5%). The knitted fabric passed through the same process as in Example 1 has a basis weight of 244 g / square m, lacks bulkiness as compared to Example 1, and exhibits a tonal appearance of the dyed fabric, impressing the poor anti-pill performance, actually Pilling was grade 2 and inferior in practicality.
[0019]
【The invention's effect】
As can be seen from the above specific examples, according to the present invention, an ideal polyester two-layer structure yarn having both high anti-pill performance and practical strength and function can be easily obtained, and its use, particularly in the knit field. Expansion can be expected.

Claims (3)

A composite spun yarn that becomes a core-sheath structured yarn when subjected to a liquid heat treatment of 120 ° C. or higher. The composite spun yarn before the liquid heat treatment has a single fiber strength of 3.6% with a low shrinkage of SHW 130 ° C. of 2.5% or less. The polyester short fiber (A) of ˜4.6 g / d and the single fiber strength 4.0 to 6.0 g / d of the polyester fiber (B) having a high shrinkage property of SHW 130 ° C. of 50% or more are 25 to 75: An anti-pill polyester core-sheath structure composite spun yarn, wherein the composite spun yarn is composited at a weight ratio of 75 to 25 , and SHW 130 ° C of the composite spun yarn is 12% or more.   2. The anti-pill polyester composite spun yarn according to claim 1, wherein the polyester fiber (B) is a short fiber having a hollowness of 5 to 35%.   The anti-pill polyester composite spun yarn according to claim 1, wherein the polyester fiber (B) is a multifilament.