JP2008255531A - Acrylic filament thick-and-thin yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an acrylic filament thick-and-thin yarn having a natural unevenness visual feeling, a soft and a dry touch feelings. <P>SOLUTION: The acrylic filament thick-and-thin yarn is composed of an acrylic polymer and has following requirements (1) to (3). (1) A thick fineness part and a thin fineness part are alternately present in the yarn longitudinal direction; (2)≥1.5 to ≤2.5 fineness ratio of the thick fineness part to the thin fineness part and (3)≥3.0 ratio of the average lengths represented by the average length of the thick fineness part/the average length of the thin fineness part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an acrylic filament yarn having thick fine portions and fine fine portions alternately along the longitudinal direction of the yarn, and has a natural sensation caused by the thick spots when processed into a knitted fabric and dyed, and soft The present invention relates to an acrylic filament thick yarn that expresses a dry feeling.

  Conventionally, a great deal of research and development has been carried out on filament filaments having a fineness difference in the longitudinal direction of the yarn, particularly with respect to polyester fibers. In the case of these polyester fibers, it is based on the use of a necking phenomenon that is manifested by stretching an unstretched yarn under specific conditions. Studies are underway on whether to stabilize the quality, and many techniques have been proposed.

  The present applicant has previously provided a multifilament yarn in which the length of the thick fineness portion is relatively long and the fineness portion exists in the same portion of each single fiber constituting the filament in the longitudinal direction of the yarn (for example, , See Patent Document 1). However, with respect to acrylic fibers, the necking phenomenon does not occur even if the drawing distribution is changed, and since the fibers are uniformly drawn along the longitudinal direction of the yarn, there is little research on thick yarn.

  In such a situation, as a method of positively imparting fineness unevenness to the yarn, the fineness in the fiber axis direction is obtained by applying a vertical vibration to the spinning nozzle and causing a draft change in the discharged uncoagulated material. And a technique for obtaining a filament thick yarn by changing the take-up speed when the spinning solution is coagulated in a coagulating liquid and taken up by a take-up roll. Provided (for example, see Patent Document 3). Furthermore, in viscose rayon, rayon filament thick yarn, etc., obtained by intermittently adding the added viscose stock solution to the steady viscose stock stream and changing the discharge amount of the stock solution from the spinning nozzle intermittently, etc. (For example, see Patent Document 4).

  However, if the fineness difference is too large in the thick and thin yarns by these conventional methods, a problem is likely to occur in the process passability in the subsequent process such as knitting, and if the difference in fineness is too small, the spotting effect is difficult to appear. . Furthermore, since the length and the period of the fine fineness portion and the fine fineness portion are constant to some extent, there has been a problem that a handle is likely to appear when the fabric is used. Accordingly, there is a strong demand for the development of a filament thick yarn having good processability and having a natural texture and excellent texture that satisfy certain conditions regarding the fineness difference and the period between the fineness portion and the fineness portion.

Japanese Patent Laid-Open No. 61-6339 JP-A-53-119322 JP 2000-226722 A JP-A-8-209434

  An object of the present invention is to provide an acrylic filament thick yarn having a natural spot feeling having a specific fineness difference and a length distribution and a soft and dry texture.

The gist of the present invention is an acrylic filament yarn made of an acrylic polymer, which is an acrylic filament thick yarn having the following requirements (1) to (3).
(1) Thickness and fineness portions are alternately present along the longitudinal direction of the yarn,
(2) The fineness ratio between the thick fineness portion and the fine fineness portion is 1.5 or more and 2.5 or less,
(3) The ratio of the average length represented by the average length of the fine portion / average length of the fine portion is 3.0 or more.

  ADVANTAGE OF THE INVENTION According to this invention, the novel acrylic filament thick fine thread which expresses the natural spot feeling resulting from a random thickness spot, and a soft dry feeling when processing and dyeing a knitted fabric can be provided.

  The acrylic polymer in the present invention is required to be a copolymer composed mainly of acrylonitrile and an unsaturated monomer copolymerizable therewith. The content of the acrylonitrile unit is preferably 50% by weight or more, and when it is 50% by weight or more, a fiber having physical properties and characteristics required as a fiber for clothing is obtained.

  Examples of unsaturated monomers copolymerizable with acrylonitrile include acrylic acid, methacrylic acid, and derivatives thereof, vinyl acetate, acrylamide, methacrylamide, vinyl chloride, vinylidene chloride, and depending on the purpose, sodium vinylbenzene sulfonate, Ionic unsaturated monomers such as sodium rylsulfonate and sodium acrylamidomethylpropanesulfonate can be used. The molecular weight of the acrylic polymer is not particularly limited as long as it is within the range used for the production of acrylic fibers, but is preferably in the range of 100,000 to 1,000,000.

  Moreover, the acrylic filament thick and fine yarn of the present invention needs to have thick fine portions and fine fine portions alternately along the longitudinal direction of the yarn. In the fine fineness portion and the fine fineness portion, the single fibers constituting the filament have thick portions and details alternately along the longitudinal direction of the yarn, and the thick portions and details of each single fiber are present at the same position in the filament. It is. Since it has thick details as a filament, when it is made into a fabric, natural spots and soft dry feeling appear.

  When the thick part and the details of the single fiber are not present at the same position in the filament, it is difficult for the feeling of spots to appear and at the same time the texture effect is poor. The fineness ratio between the thick fineness portion and the fine fineness portion needs to be in the range of 1.5 to 2.5. When the fineness ratio is 1.5 or more, the fineness difference between the thick fineness portion and the fineness fineness portion is large, the effect of thickness fineness is exhibited, and the feeling of spots and dryness are excellent. Accordingly, it is desirable to select the fineness ratio to be as large as possible. However, if the fineness ratio is 2.5 or less, a problem is likely to occur in the process passability in a subsequent process such as knitting. Although natural spot sensation can be obtained when the fineness ratio is in the range of 1.5 to 2.5, further fine sensation is expressed when the fineness ratio is not constant but dispersed.

  Furthermore, it is necessary that the ratio of the average length represented by the ratio of the average length of the thick fineness portion and the average length of the fineness fineness portion is 3.0 or more. When the ratio of the average length is 3.0 or more, the thick fineness portion is lifted as a pattern on the fabric, and a more natural spot feeling can be obtained.

  The acrylic filament thick and fine yarn of the present invention has good patchiness and softness due to being randomly dispersed within the range of the length of the fine fineness portion of 20 to 60 cm and the length of the fineness fineness portion of 60 to 180 cm. It is possible to obtain a dry feeling. When the length of the thick portion is in the range of 20 cm to 60 cm, the thick / fine difference effect is easily exhibited. Similarly, when the length of the fineness portion is in the range of 60 cm to 180 cm, the thick / fine difference effect is easily exhibited. In addition, when the length ratio of the longest fine fineness portion and the shortest fineness fineness portion is 1.5 or more, it is easy to express natural spots and does not become a monotonous pattern when woven or knitted. When the height distribution is randomly distributed, more natural spots can be expressed.

  The solvent for the spinning dope used in the present invention is not particularly limited as long as it can dissolve the acrylic polymer, and examples thereof include dimethylformamide, dimethylacetamide, dimethylsulfoxide and the like. Further, the solid content concentration of the acrylic polymer in the spinning dope varies depending on the type of solvent, the degree of polymerization of the polymer, the composition ratio, etc., but may be about 20 to 28% by weight. If the solid content concentration is less than 20% by weight, the spinning property is remarkably deteriorated. On the other hand, if it exceeds 28% by weight, the stability with time of the spinning dope deteriorates and the spinning property is lowered.

The method for producing the acrylic filament thick and fine yarn of the present invention is not particularly limited as long as the object of the present invention can be achieved, and can be performed by wet spinning, dry wet spinning, dry spinning method, etc. The wet spinning method or the dry wet spinning method is used.
The spinning dope is led through a spinneret to a spinning coagulation bath mainly composed of a solvent of the spinning dope and water. The spinning coagulation bath conditions are not particularly limited. For example, when dimethylacetamide is used as the solvent, the spinning coagulation bath preferably has a temperature of 0 to 45 ° C. and a solvent concentration of 10 to 75%.

  As a method for imparting fineness unevenness to the coagulated yarn, for example, by changing the yarn path using a guide in front of the take-up roll or draw roll, Examples thereof include a method for imparting fineness spots by changing the rotational speed, and a method for imparting fineness spots by changing the rotational speed of the drawing roll.

  The method for imparting fineness spots is not particularly limited as long as the object of the present invention can be achieved. By actively applying fineness spots, stretching, washing, drying, and heat relaxation treatment are performed by known methods. Thus, the acrylic filament thick yarn of the present invention is provided with balanced mechanical properties.

The evaluation of mottle and texture was performed by the following method.
1) Evaluation method of mottle feeling After creating a knitted fabric with a 20G cylinder knitting machine using an acrylic filament and dyeing with a cationic dye, the mottle feeling was visually evaluated. A sample having a natural sensation and excellent design was designated as ◯, a sample having poor sensation and a uniform appearance as x.
2) Evaluation method of texture The texture was evaluated with the knitted fabric used for the above-described spot feeling evaluation. A sample having a soft and dry texture, excellent in the texture, was marked with ◯, and a texture with a poor texture was marked with X.

  EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, these do not limit this invention at all.

[Examples 1-3, Comparative Examples 1-3]
Acrylic polymer consisting of 93% acrylonitrile unit, 6% vinyl acetate unit and 1% sodium styrenesulfonate unit and having an average molecular weight of 300,000 is dissolved in dimethylacetamide (DMAc) to a solid content concentration of 26% by weight. Thus, a stock solution for spinning was prepared.
The spinning dope is heated to 60 ° C. and discharged from a nozzle having a pore diameter of 0.15 mm and a number of holes of 60 through an air layer into a coagulation bath having a temperature of 40 ° C. composed of 73% by weight of dimethylacetamide and 27% by weight of water. Formed.
Next, the coagulated yarn was taken up by the take-up roll having a speed of 53 m / min while changing the yarn path by a movable guide that rotates between the coagulation bath and the take-up roll. At this time, the movable radius of the movable guide was changed from 5 cm to 20 cm, and the number of rotations was changed within the range of 60 rpm to 120 rpm.
Thereafter, it was washed with water, stretched 3.0 times in boiling water, dried, and further stretched 2.0 times in a dry heat state, followed by hot plate relaxation to obtain an acrylic filament yarn having a fineness of 170 dtex. The obtained 50 m sample of raw yarn was weighed every 10 cm, and the fineness distribution was measured. Furthermore, a knitted fabric was prepared using the raw yarn, and the texture and texture were evaluated.
The results obtained above are listed in Table 1.

Claims (3)

An acrylic filament yarn made of an acrylic polymer, which has the following requirements (1) to (3):
(1) Thickness and fineness portions are alternately present along the longitudinal direction of the yarn,
(2) The fineness ratio between the thick fineness portion and the fine fineness portion is 1.5 or more and 2.5 or less,
(3) The ratio of the average length represented by the average length of the fine portion / average length of the fine portion is 3.0 or more.   The ratio represented by the length of the longest fine fineness part / the length of the shortest fine fineness part and the ratio represented by the length of the longest fine fineness part / the length of the shortest fine fineness part are both 1. The acrylic filament thick yarn according to claim 1, which is 5 times or more.   The acrylic filament thick yarn according to claim 1 or 2, wherein the thick fine portion is randomly dispersed in a range of 20 to 60 cm in length and 60 to 180 cm in length of the fine fine portion.