JPH04136262A - Production of high-density cloth - Google Patents

Abstract

PURPOSE:To obtain a high-density cloth having tension, rigidity and excellent surface touch by shrinking woven or knitted fabric containing >= a specific amount of mixed filament yarns containing a specific low shrinkable nylon 6 and a specific highly shrinkable polyester filament with superheated steam at a specific temperature. CONSTITUTION:A low shrinkable nylon 6 satisfying conditions of 0.035-0.045 double refraction, <=10% shrinkage percentage in boiling water and <=0.1g/d maximum thermal stress value and a highly shrinkable polyester filament satisfying >=20% shrinkage percentage in boiling water, >=100 deg.C peak temperature and >=0.4g/d maximum thermal stress value are arranged and subjected to interlacing treatment to give a mixed yarn. Woven or knitted fabric containing at least >=35wt.% of the mixed yarn is shrunk with superheated steam at 130-220 deg.C, colored, finished and processed to give the objective high-density cloth.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for producing a high-density fabric that has excellent firmness and elasticity, and in which nylon 6-filament yarns are mainly exposed on its surface, and has good texture and appearance.

[Conventional technology]

Conventionally, the take-up speed during spinning is 3500 m/min or more,
Nylon 6 obtained by so-called -process high-speed spinning method
Knitted fabrics are woven using multifilament yarns made of filament yarns. However, nylon 6 filament yarn has a boiling water shrinkage rate of 1
0% or less, and the maximum aging stress value is 0.1g /
d or less, the amount of shrinkage during heat treatment of the knitted fabric is small, making it difficult to produce a high-density fabric with firmness and stiffness. For this reason, a method has been proposed in which a knitted fabric is woven using a mixed yarn in which nylon 6 filament yarn and a high shrinkage system are entangled in air, and the knitted fabric is subjected to hot water treatment to shrink it (especially Publication number 61-40778). If this method is adopted, it is theoretically believed that the highly shrinkable yarn will shrink greatly, giving firmness and stiffness to the fabric, and that nylon 6 filament yarn with less shrinkage in the negative direction will appear on the surface of the fabric. However, in reality, when polyester filament yarns, which are generally commercially available as highly shrinkable yarns, are used, nylon 6 filament yarns and polyester filament yarns tend to coexist on the surface of the resulting knitted fabric. was there. Therefore, when this knitted fabric is dyed, there is a drawback that irritation occurs due to the difference in dyeability between the nylon 6-filament yarn and the polyester filament yarn. Another drawback was that the fabric obtained did not necessarily have a high density.

[Problem to be solved by the invention]

The present inventors investigated the reason why a mixture of nylon 6 filament yarn and polyester filament yarn appears on the surface of knitted fabrics, and why the resulting fabric does not necessarily have a high density. It was found that this is because the maximum thermal stress value of polyester filament yarn is low. Based on this knowledge, polyester filament yarn with a high maximum thermal stress value was mixed with nylon 6 filament yarn to make a knitted fabric, and this knitted fabric was subjected to hot water treatment to shrink, resulting in a high-density fabric. I tried to manufacture it. However, it has not been possible to produce a high-density fabric that has the firmness and elasticity that is the object of the present invention, and has good texture and appearance. That is, in general hot water treatment,
In other words, the desired high-density fabric could not be obtained by normal pressure treatment at 100° C. or lower or pressure treatment at 100° C. or higher. Specifically, when hot water treatment is carried out under normal pressure at 100°C or less, the 'tm fabric does not shrink sufficiently and does not become dense, and the surface of the 'tm fabric is mainly coated with nylon 6.
It was not possible to manifest a filament system. In addition, when hot water treatment is carried out under pressure at 100"C or more, the nylon 6 filament yarn becomes brittle and has a hard texture (along with rapid shrinkage, the fabric becomes uneven and has large irregularities with a textured texture). Therefore, the present invention uses a mixed yarn of polyester filament yarn and nylon 6 filament yarn whose maximum thermal stress value satisfies certain conditions, and also under certain specific conditions. By shrinking the fabric, they were able to successfully obtain a high-density fabric that has firmness and elasticity, as well as good texture and appearance.

[Means for Solving the Problems] That is, the present invention has a birefringence of 0.035 to 0.045, a boiling water shrinkage rate of 10% or less, and a maximum thermal stress value of 0.1 g/ A low shrinkage nylon 6 filament yarn that satisfies the three conditions of being less than A knitted fabric containing at least 35% by weight of a highly shrinkable polyester filament yarn that satisfies the three conditions of g/d or higher is heated with superheated steam at 130 to 220°C. The present invention relates to a method for producing a high-density fabric, which is characterized in that it is subjected to shrinkage treatment and then dyed.The low-shrinkage nylon 6-filament yarn used in the present invention satisfies the following three conditions. That is, the birefringence is 0.035 to 0.045, the boiling water shrinkage is 10% or less, and the maximum thermal stress value is 0.1 g/d.
The following must be met. Birefringence of low shrinkage nylon 6 filament yarn is 0.0
If it is less than 35, the yarn quality tends to change over time, making it impossible to obtain a fabric with excellent feel, which is not preferable. Moreover, a material having a birefringence exceeding 0.045 is difficult to produce by a high-speed spinning method using a -step method, which is not rational. Boiling water shrinkage rate of low shrinkage nylon 6 filament yarn is 10
%, the difference in shrinkage from the high shrinkage polyester filament yarn used in the present invention becomes small, making it difficult to make the nylon 6 filament yarn mainly appear on the surface of the fabric. Here, the boiling water shrinkage rate is measured by the following method. In other words, the yarn is wound up a certain length on a rocky shore, and its length under an initial load of 1 g/d is i.
o, then treated in unrestrained boiling hot water for 15 minutes, then air-dried, and its length under an initial load of 1 g/d is lI, then it is calculated by the following formula: is the value. Boiling water shrinkage rate (%) = [(ffi-4,)/
1°: 1×100. Maximum thermal stress value of low shrinkage nylon 6 filament yarn is 0
．． If it exceeds 1 g/d, it is not preferable because it may adversely affect the shrinkage behavior of the highly shrinkable polyester filament yarn used in the present invention. Here, the maximum thermal stress value is measured by the following method. That is,
Using a commercially available dry heat shrinkage stress meter, the sample was measured at 15CII.
The initial tension of the ring is set to 60 .mu./d, and the measurement is performed at a heating rate of 300.degree. C./60 sec, and the maximum stress value developed is measured. The nylon 6 filament yarn as described above can be easily produced by a so-called -step type high speed spinning method in which the take-up speed during melt spinning is 3500 m/min or more. In addition, the breaking elongation of such nylon 6 filament yarn is 40
It is about 70%. The highly shrinkable polyester filament yarn used in the present invention satisfies the following three conditions. That is,
The boiling water shrinkage rate is 20% or more, and the peak temperature is 10%.
The temperature is 0° C. or higher, and the maximum thermal stress value is 0.4 g/d or higher. The boiling water shrinkage rate of high shrinkage polyester filament is
Must be 20% or more, especially 22 to 60%
It is preferable that When the boiling water shrinkage rate is less than 20%, the difference in shrinkage from the low shrinkage nylon 6 filament yarn used in the present invention becomes small, making it difficult to make the nylon 6 filament yarn mainly appear on the surface of the fabric. The boiling water shrinkage rate was measured as described above. The peak temperature of the highly shrinkable polyester filament yarn needs to be 100°C or higher. If the peak temperature is less than 100°C, there is a risk of shrinkage at low temperatures, shrinkage may occur in processes other than the shrinkage process, such as weaving and weaving processes, and the properties of the polyester filament yarn may deteriorate before the shrinkage process. This is not preferable since it may cause wrinkles in the knitted fabric during dyeing. Here, the peak temperature is the temperature at which the dry heat shrinkage rate shows the maximum value. The measurement method is the same as the fresh water shrinkage rate measurement described above, in which the treatment temperature is variously changed and the temperature at which the maximum shrinkage rate is detected is detected. The maximum thermal stress value of the highly shrinkable polyester filament yarn is required to be 0.4 g/d, preferably 0.4 to 0.7 g/d, most preferably 0°45 to 0.
．． It is good that it is 65 g/d. Maximum thermal stress value is 0.4g
If it is less than /d, sufficient shrinkage cannot be given to the knitted fabric, and it becomes difficult to make mainly nylon 6 filament yarns appear on the surface thereof, which is not preferable. The method for measuring the maximum thermal stress value is as described above. The polyester filament yarn used in the present invention needs to satisfy the three conditions mentioned above. For example, even if the boiling water shrinkage rate is 40%, the maximum thermal stress value is 0.4.
If it is less than g/d, sufficient shrinkage cannot be given to the knitted fabric. Further, even if the maximum thermal stress value is 0.4 g/d or more, if the boiling water shrinkage rate is less than 20%, sufficient shrinkage cannot be given to the knitted fabric. That is, in order to give the knitted fabric the shrinkage that is the aim of the present invention, the boiling water shrinkage rate alone, which was a conventional guideline, is insufficient, and both the boiling water shrinkage rate and the maximum thermal stress value must be within a specific range. is necessary. The above-mentioned high shrinkage polyester filament yarns are
It can be obtained by melt spinning certain polyester polymers. That is, it can be obtained by using a terpolymer polyester in which the total amount of ethylene glycol and terephthalic acid is 85 mol % or more and isophthalic acid and the like are 15 mol % or less. A mixed yarn is prepared by mixing the low shrinkage nylon 6 filament yarn and the high shrinkage polyester filament yarn described above. The mixed yarn may be prepared by mixing or twisting a multifilament yarn made of low shrinkage nylon 6-filament yarn and a multifilament yarn made of high shrinkage polyester filament yarn. As the multifilament yarn, one that has been melt-spun may be used, or one that has been subjected to false twist processing may be used. In particular, if a false-twisted yarn is used as a low-shrinkage nylon 6 multifilament yarn and a non-false-twisted high-shrinkage polyester multifilament yarn is mixed or twisted, the shrinkage will be low. The nylon 6 filament yarn tends to appear on the surface of the mixed yarn, and when the present invention is applied using this yarn, a fabric with good hand feel can be obtained, which is preferable. The single yarn fineness of low shrinkage nylon 6 filament yarn and high shrinkage polyester filament yarn is 1.0 to 5.0.
A denier (d) grade is preferable. In particular, it is preferable that the single filament fineness of the low-shrinkage nylon 6-filament yarns appearing on the surface of the fabric be smaller than that of the high-shrinkage polyester filament yarns, since this makes the fabric feel softer. Also,
The mixing ratio of the low shrinkage nylon 6 filament yarn and the high shrinkage polyester filament yarn in the mixed yarn is preferably such that when the total fineness of the former is 100, the total fineness of the latter is 60 or less. If the mixing ratio of the highly shrinkable polyester filament yarn exceeds 60 in total fineness, there is a risk that a large amount of the highly shrinkable polyester filament yarn will appear on the surface of the resulting fabric. This mixed yarn must be contained in the knitted fabric in an amount of at least 35% by weight. The amount of mixed yarn is 35% by weight
If it is less than that, it is not preferable because sufficient shrinkage cannot be given to the knitted fabric. Moreover, various conventionally known knitting structures can be arbitrarily adopted as the knitting structure of the knitted fabric. Note that after knitting and weaving, it is preferable not to dry at high temperatures or to perform sizing. This is because the shrinkability of the highly shrinkable polyester filament yarn may be inhibited. This knitted fabric is subjected to a shrinkage treatment using superheated steam at 130 to 220°C. During this shrinkage treatment, it is preferable not to apply tension to the knitted fabric, that is, to leave the w1 fabric in a free state. If the temperature of the superheated steam is less than 130°C, it is not preferable because sufficient shrinkage cannot be given to the knitted fabric. If the temperature of the superheated steam exceeds 220° C., rapid shrinkage will occur, making the surface of the fabric more likely to become uneven, which is not preferable. Furthermore, if hot water is used without using superheated steam, it is not possible to give the knitted fabric good shrinkage. That is, if hot water with a temperature of less than about 90°C is used,
It is not possible to give sufficient shrinkage to the knitted fabric, and the temperature is 10
When hot water of 0″C or higher is used, low shrinkage nylon 6
The filament yarns become brittle and the texture of the resulting fabric deteriorates, or the knitted fabric rapidly shrinks, resulting in large irregularities appearing on the surface of the fabric. After the knitted fabric is shrunk, it is dyed by a conventionally known method using a disperse dye, an acid dye, or the like, or it is subjected to a conventionally known finishing process to obtain a high-density fabric. [Example] Example Low shrinkage nylon 6 with a birefringence index of 0.045, a fresh water shrinkage rate of 9.2%, and a maximum thermal stress value of 0.07 g/d.
A 70 denier/34 filament nylon 6 multifilament yarn consisting of a filament yarn was prepared. This nylon 6 multifilament yarn was produced by a -step high-speed spinning method with a spinning take-off speed of 4500 m/min. The breaking elongation of the low shrinkage nylon 6 filament yarn was 58%. On the other hand, a polyester containing 12 mol % of an isophthalic acid component in addition to the ethylene glycol component and terephthalic acid component was melt-spun to obtain a highly shrinkable polyester filament yarn. The fresh water shrinkage rate of this highly shrinkable polyester filament yarn is 25%, and the peak temperature is 132°C.
The maximum thermal stress value was 0.5 g/d. A 30 denier/12 filament polyester multifilament yarn made of this highly shrinkable polyester filament yarn was prepared. The above nylon 6 multifilament yarn and polyester multifilament yarn were aligned and interlaced to obtain a mixed yarn. This mixed thread was used for the warp and weft to weave a plain fabric with a warp density of 120 threads/inch and a weft density of 85 threads/inch. This plain woven fabric was heated at 180°C for 1 hour and 1 minute.
-Shrinkage treatment was performed using a T-S steamer (continuous superheated steaming method). As a result, the plain woven fabric shrunk by 38% in the warp direction and by 28% in the weft direction, resulting in a warp density of 154 threads/inch and an II density of 117 threads/inch. The plain woven fabric thus shrunk was treated with 1 g/1 of caustic soda using a circular dyeing machine manufactured by Himi Seisakusho.
Sunmoor FL (manufactured by NICCA CHEMICAL ■, surfactant law) Ig/j
2 was used for refining at a temperature of 80° C. for 1 hour and 20 minutes. Next, using the dyeing machine, the temperature is 90°C5.
Dyeing was carried out for 30 minutes using an acid dye. The obtained fabric had appropriate firmness and elasticity, had little irritation or wrinkles on the surface, and had good texture and appearance. Comparative Example 1 A fabric was obtained in the same manner as in Example, except that the plain woven fabric was subjected to shrinkage treatment using hot water at a temperature of 90° C. for 1 hour and 1 minute. As a result, the shrinkage of the hand woven fabric is insufficient, i.e. by 15% in the warp direction.
, it contracted only 10% in the latitudinal direction. Therefore, the plain woven fabric after shrinkage had a warp density of 132 threads/inch and a weft density of 98 threads/inch. In addition, the obtained fabric lacks firmness and waist,
Wrinkling caused by uneven shrinkage was observed on the surface. Comparative Example 2 The conditions for shrinkage treatment of plain woven fabric were: temperature: 110°C, time: 10
Fabrics were obtained in the same manner as in the examples, except that they were shrink-treated with hot water for 1 minute using a jet dyeing machine. As a result, the plain woven fabric shrinks sufficiently, i.e. 40% in the warp direction.
, it shrunk by 30% in the latitudinal direction. Therefore, the plain woven fabric after shrinkage had a warp density of 156 threads/inch and a weft density of 120 threads/inch. However, the texture of the obtained fabric was hard, and large irregularities with a non-uniform grain pattern caused by rapid shrinkage were observed on the fabric surface. Comparative Example 3 Highly shrinkable polyester filament yarn with fresh water shrinkage rate of 40% and maximum thermal stress value of 0°3 g/d
A fabric was obtained in the same manner as in the example except that the fabric was used. As a result, the shrinkage of the plain fabric is insufficient, that is, by 17% in the warp direction.
, it contracted only 10% in the latitudinal direction. Therefore, the hand woven fabric after shrinkage had a warp density of 132 threads/inch and a weft density of 100 threads/inch. In addition, the obtained fabric lacks firmness and waist,
Irritation was visible on its surface.

[Action and effect of the invention]

As explained above, the method for producing a high-density fabric according to the present invention involves mixing low-shrinkage nylon 6-filament yarn having certain physical properties with high-shrinkage polyester filament yarn having certain physical properties. A knitted fabric made of a certain amount of mixed yarn is subjected to a shrinkage treatment using superheated steam at 130 to 220°C. Therefore, the high shrinkage polyester filament yarn contracts with a large amount of displacement, while the low shrinkage nylon 6 filament yarn undergoes relatively little displacement. Therefore, a yarn length difference occurs between the former and latter filament yarns, the latter filament yarns cover the former filament yarns, and nylon 6 filament yarns appear on the surface of the knitted fabric. As a result, the knitted fabric after shrinkage exhibits the characteristics of nylon 6-filament yarn in appearance, and the surface of the dyed ring also exhibits the characteristics of nylon 6-filament yarn. Further, due to the large shrinkage of the highly shrinkable polyester filament yarn, the structure of the knitted fabric becomes highly dense, which can impart firmness and stiffness to the resulting fabric. As a result of the above, the fabric obtained by the method according to the present invention is
It has firmness and firmness, has an excellent surface feel, and is free from irritation and wrinkles, making it useful for use in clothing, etc.

Claims (1)

[Claims] Birefringence is 0.035-0.045, boiling water shrinkage is 10% or less, maximum thermal stress is 0.1g
Low shrinkage nylon 6 filament yarn that satisfies the following three conditions: /d or less, boiling water shrinkage rate of 20% or more, peak temperature of 100℃ or more, and maximum thermal stress value of 0.4g. A knitted fabric containing at least 35% by weight of a high-shrinkage polyester filament yarn that satisfies the three conditions of /d or more is heated to superheated steam at 130 to 220°C. A method for producing a high-density fabric, which comprises shrinking the fabric and then dyeing it.