JPH108339A - Warp for weaving - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject substantially zero twist yarn excellent in high- speed weaving properties, capable of providing 4 woven fabric improved in qualities of warp, by interlacing and sizing Lyocell (R) fiber multifilament yarn under specific conditions, respectively. SOLUTION: A substantially zero twist yarn (usually 3-5g/d dry strength and 5-10% dry elongation) is interlaced under conditions to make the number of interlacings of 10-30 interlacings/m and sized under conditions to make 1-4wt.% pick-up of a sizing agent. Fluff, end breakage, etc., can be extremely reduced without causing reduction in quality of woven fabric product resulting from a defect of skitteriness when weaving the yarn at high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warp for weaving obtained by subjecting a substantially non-twisted lyocell fiber multifilament yarn to interlacing and sizing, and more particularly to a high-weaving efficiency and high-quality woven fabric. And a warp for weaving.

[0002]

2. Description of the Related Art When a lyocell fiber multifilament yarn is used as a warp for weaving, the generation of fluff and warp of the warp due to the contact friction between the yarns and the contact friction between the yarn and a metal such as a heald or a reed is prevented. Usually, twisting or sizing is performed to obtain high weaving efficiency, or twisting and sizing are used in combination.

[0003] However, in recent years, when weaving cellulose fibers, conventional weaving looms from 150 to 180 rpm to 200 rpm are used.
Various innovative looms, such as rapier looms and gripper looms exceeding rpm, have appeared.
The speed of weaving is increasing, for example, at 0 rpm. Therefore, as warp yarns that did not hinder conventional low-speed weaving become more and more medium-speed, severer rubbing and tensioning effects are applied, and the weaving efficiency due to the fluff caused by filament cutting and the resulting warp cutting is increased. Is reduced. In order to solve this problem, a method of increasing the number of twists or a method of increasing the amount of adhesive applied during sizing has been adopted.

The former method of increasing the number of twisted yarns not only increases the cost of twisted fluff and twisted yarn, but also does not contribute to improving the weaving efficiency of non-twisted warp yarns. Therefore, in order to improve the weaving efficiency of the untwisted warp, the latter method of increasing the amount of glue adhering is usually used. For example, when a conventional regenerated cellulose-based multifilament yarn, a copper-ammonia rayon yarn or a viscose rayon yarn, is used as a warp for air jet loom weaving, the amount of sizing agent attached is that for a shuttle loom. By setting the weight ratio to 3.3 wt% to 4 wt%, which is more than 2.5 wt% to 3.3 wt%, it is not necessarily sufficient, but a considerably satisfactory weaving efficiency and woven fabric quality are realized.

However, the lyocell fiber multifilament yarn cannot obtain the weaving efficiency equivalent to that of the conventional regenerated cellulose-based multifilament yarn even if a very large amount of sizing agent of 5 to 6% by weight is applied. In addition to being disadvantageous in terms of cost, the warp becomes hard, resulting in a significant decrease in warp quality due to defects in the fabric such as chika and cracks in the fabric, and a work environment due to falling off of the adhesive during weaving. Problems such as deterioration and reduction in weaving efficiency have occurred.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a woven fabric comprising a substantially non-twisted lyocell fiber multifilament yarn capable of obtaining a woven fabric of high weaving efficiency and good quality in high-speed weaving. It is intended to provide a warp.

[0007]

The present inventors have found that when weaving in an air jet loom, the lyocell fiber multifilament yarn has a larger amount of glue adhering than the conventional regenerated cellulose fiber. As a result of intensive studies on the necessity, it was found that the swelling degree of the lyocell fiber multifilament yarn was smaller than that of the conventional regenerated cellulose-based multifilament yarn. In other words, the lyocell fiber multifilament yarn with a small degree of swelling does not sufficiently penetrate between filaments even if the amount of glue adhering at the time of sizing is increased, and adheres to the yarn surface. It has been found that the fraction does not necessarily contribute to the substantial improvement of the convergence of the filaments. As a result of further examination, according to the method of sizing after applying the opening action and confounding by interlace processing,
The inventors have found that it is possible to solve the above problems and to provide a weaving warp capable of obtaining satisfactory weaving efficiency and woven warp quality, and have accomplished the present invention.

More specifically, the present invention relates to a warp for weaving using a substantially non-twisted lyocell fiber multifilament yarn, wherein the number of entanglements by interlacing (A) and the amount of glue adhering (B) are as follows. The present invention relates to a weft warp characterized by satisfying. 10 co / m ≦ (A) ≦ 30 co / m 1% by weight ≦ (B) ≦ 4% by weight In the present invention, the lyocell fiber is a cellulose solution obtained by dissolving cellulose in a mixed solvent of an organic solvent and water. And a cellulose fiber obtained by wet spinning or dry spinning the solution as a spinning solution. In other words, cellulose fibers obtained by organic solvent spinning,
It does not go through the form of a cellulose derivative.

[0009] For example, as described in JP-B-60-28848, a solution containing a non-solvent such as cellulose and water dissolved in an organic solvent is spun in air or in a non-precipitating medium. At this time, the fiber-forming solution obtained from the spinneret is pulled at a speed higher than the speed at which the fiber-forming solution is sent out, drawn at a draw ratio of 3 times or more, and then treated with a non-solution.

The organic solvent may be a known solvent, for example, the following amine oxides disclosed in Japanese Patent Publication No. 28848/1985, or may be another kind of solvent. Amine oxides used as organic solvents include, for example, tertiary amine-oxides, for example the oxides of trimethylamine, triethylamine, tripropylamine, monomethyldiethylamine, dimethylmonoethylamine, monomethyldiproamine; Oxides of dimethyl-, N-diethyl-, N-dipropylcyclohexylamine; oxides of pyridine; and cyclic mono (N-methylamine-N-oxide) such as N-methylmorpholine N-oxide. Among them, the use of N-methylmorpholine N-oxide is preferred.

The weaving warp of the present invention usually has a dry strength of 3 g.
/ D to 5 g / d, dry elongation 5% to 10%, preferably dry strength 3 g / d to 4 g / d, dry elongation 7
% Or more and 10% or less of lyocell fiber multifilament yarn. In the present invention, “substantially non-twisted” means that no special twist is added except for the twist that is naturally caused by unwinding or the like.

In the present invention, the entanglement by the interlacing treatment is imparted by a well-known interlacing treatment such as US Pat. No. 3,560,211, which describes application to a cellulosic multifilament yarn. The number of entanglements is a value obtained in accordance with the method described in US Pat. No. 2,985,955. The sample is suspended by suspending a load of total denier × 0.2 g at the lower end of the entanglement yarn having a sample length of about 1 m. Hanging at the center of the yarn bundle above the sample, about 0.7 mm in diameter
While holding the chrome-plated hook and supporting it with insect pins, gently raise it temporarily until it is stopped at the confounding part above the insertion position, and then gently lower it from that position until it is stopped at the confounding part below. Then, the descending length L (cm) is measured, and then the hook is reinserted immediately below the entangled portion where the hook is stopped, and the hook is further lowered until the hook is stopped at the entangled portion to measure L. Repeat this, change the sample and perform the same
At least 50 or more Ls are obtained.

The number of confounds is a value obtained by 100 / (average value of L). Incidentally, the rising speed and the falling speed of the hook are 1 cm / sec. When the number of entanglements is less than 10 cores / m, the convergence of the entangled yarn is reduced, and the weaving efficiency is reduced even if sizing is performed thereafter. When the number of entanglements exceeds 30 ko / m, the convergence of the entangled yarn is improved, and when sizing is performed thereafter, the weaving efficiency is remarkably improved.
Irregular defects of the fabric are generated and the quality is reduced.

That is, by sizing the number of entanglements by interlacing in the range of 10 to 30 k / m, high weaving efficiency can be obtained at the time of high-speed weaving without lowering the fabric quality due to the drawbacks of irritability. On the other hand, when the amount of the glue attached to the entangled yarn is less than 1% by weight, the weaving is caused by the filament cutting during weaving, or the warp cutting resulting therefrom significantly lowers the weaving efficiency. If the amount of the glue adhering exceeds 4% by weight, the warp yarn becomes too hard, causing a chika defect generated in the woven fabric. Due to the difference in the reflection of the fabric, a fabric defect that appears to be shining at first glance) and a ground cracking defect (a fabric defect that causes the warp of the warp in the woven fabric to bend in a wavy manner and cause a crack on the fabric surface when the amount of glue to the warp is too large). In addition to the decrease in warp quality, the entangled portion of the entangled yarn is excessively fixed by the sizing agent. Also, the irritability defect is exhibited, and the quality of the woven fabric is significantly reduced.

The weaving warp of the present invention is obtained by sizing with a touch roller system after imparting entanglement by interlacing. The touch roller method means that, first, one sizing roller whose lower end is immersed in an aqueous sizing solution is given the same rotation as the running direction of the sizing yarn, so that the upper surface of the sizing roller not immersed in the aqueous sizing solution Are always coated with the aqueous paste solution. On the other hand, the sizing yarn that runs above the sizing roller in the direction perpendicular to the roller is pushed down by a guide roller installed on the sizing yarn supply side from the sizing roller, and the sizing roller
This is a method in which a sizing agent is attached to a sizing target yarn by giving a contact length of 0 mm to 70 mm.

In the present invention, the degree of polymerization is from 300 to 20.
A polyvinyl alcohol-based sizing agent (hereinafter referred to as PVA) having a degree of saponification of 75 to 90 mol% can be suitably used alone or in a mixture.
A is also preferably used. Also, a mixed paste such as an acrylic ester copolymer partially hydrolyzed with NaOH and the polyvinyl alcohol paste may be suitably used. The sizing yarn is supplied to the sizer by making the sizing agent an aqueous solution of 2 to 6% and further adding an oil agent corresponding to 5 to 20% of the sizing agent pure at 30 to 42 ° C. It is preferable to attach the yarn to the yarn at a sizing draft rate of the yarn of -1% to + 3%.

The components of the oil agent include mineral oil, animal and vegetable oil,
Alternatively, in liquid oils mainly composed of fatty acid ester derivatives, paraffin wax, etc., silicone-based activators, fluorine-based activators, alcohols, etc., as wettability-improving components for preventing the adhesive film from being cut off on the sizing roller surface. For example, those containing an emulsifying and dispersing agent such as a nonionic activator or an anionic activator as necessary are preferably used.

Further, preferable conditions after the glue adhering step are as follows: a chamber drying temperature is 100 to 150 ° C., a hot cylinder drying temperature is 100 to 130 ° C., and a winding speed is 80 to 20.
0 m / min, but the residual moisture content of the wound yarn is 3 to 7
It is desirable to set the take-up speed and the drying temperature so as to obtain the weight%. In the present invention, there is no need to limit the sizer as long as sizing by the touch roll method is possible.

In the present invention, the sizing adhesive amount does not include the oil agent added to the sizing aqueous solution, that is, the PVA
The adhesion ratio of A to the net weight of the yarn is referred to. In the present invention, the weaving loom is not particularly limited, and excellent effects can be obtained for any of the shed loom, the rapier loom, the greeper loom, and the jet loom. The weft of a woven fabric using the warp in the present invention is not particularly limited, and multifilament yarns and spun yarns such as lyocell fiber, conventional regenerated cellulose fiber yarn, and synthetic fiber yarn represented by polyester. A yarn or a natural fiber yarn may be used, and further, these composite yarns can be used. The woven structure is not particularly limited, and can be woven with taffeta, twill, satin structure, or the like.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to embodiments. The lyocell fiber multifilament yarn used here was obtained in the following production example.

[0021]

[Production example] (Production of lyocell fiber) According to Japanese Patent Publication No. 60-28848, pulp and an aqueous solution of N-methylmorpholine N-oxide are put in a mixing tank,
Mix under reduced pressure to obtain a cellulose having a cellulose concentration of 10.0%.
A solution was prepared. Air-gap spinning of the cellulose solution was performed at a discharge temperature of 124 ° C. The spun yarn was scoured by washing with water, dried, and wound up.

[0022]

Examples 1 to 4 Using the lyocell fiber obtained in the production example, the following treatment and weaving were carried out under the conditions shown in Table 1. Before winding a lyocell fiber multifilament yarn having a yarn thickness of 75 denier / 50 filaments into a warp supply state, an interlace nozzle is used, an interlace treatment is performed, the air pressure is varied, and various numbers of entanglements are obtained. I got a thread. Then, the entangled yarn is used as Tsuda Koma KS-200A.
Using a T sizer, take-up speed is 120 m / min, chamber temperature is 140 ° C, heat cylinder temperature is 115 ° C,
Under the condition of a draft rate of 1%, a paste obtained by adding Sanyo Chemical's Parallel-AB 0.35% as a pure oil to a 3.5% pure solution of Gohsenol GL-05 as a sizing agent in combination with an oil agent. Used as a paste, paste temperature 38 ° C, contact length 5
At 0 mm, sizing was performed by a touch roller method. In addition, weaving warp yarns with various amounts of glue adhered were obtained by changing the rotation speed of a sizing roller.

Using each of them for warp, Tsudakoma ZA-1
10 air jet loom rotation speed 800r. p. m.
Table 1 shows the results of weaving the taffeta. The weaving efficiency was evaluated by performing weaving with three looms for 30 days and expressing the average value of the number of times the loom stopped due to the warp per day (24 hours) per loom. The ones exceeding the above were regarded as defective. The quality of the woven fabric was evaluated by visual judgment in a stationary state on an inspection machine.

As a result, in each of the examples, the requirements of the present invention are satisfied, the weaving efficiency is good, and there is no occurrence of irritability and ground cracking, and the grade is good.

[0025]

Comparative Examples 1 and 2 The procedure was performed in the same manner as in Example 1 except for the conditions shown in Table 1. As a result, although the glue adhesion amount satisfies the present invention, those having a large number of entanglements have good weaving efficiency, but have poor warp quality due to generation of irritation.

[0026]

Comparative Example 3 The procedure was performed in the same manner as in Example 1 except for the conditions shown in Table 1. As a result, those with a large number of entanglements and a small amount of glue adhering have no irritation and good quality, but have poor weaving efficiency.

[0027]

Comparative Example 4 The procedure was performed in the same manner as in Example 1 except for the conditions shown in Table 1. As a result, the number of entanglements satisfies the requirements of the present invention, but a yarn with a large amount of glue adhering has good weaving efficiency but suffers from irritability and ground cracking, resulting in poor quality.

[0028]

Comparative Examples 5 and 6 The same procedures as in Example 1 were carried out except for the conditions shown in Table 1. As a result, the number of entanglements satisfies the requirements of the present invention, but the yarn with a small amount of glue adhering is free from irritation and ground cracking, has good warp quality, but has poor weaving efficiency.

[0029]

Comparative Examples 7 to 9 The same procedures as in Example 1 were carried out except for the conditions shown in Table 1. As a result, the less entangled yarn is
Although the warp quality due to the irritability defect is good, the weaving efficiency is poor, and the yarns of Comparative Examples 7 and 9 with a large amount of the glue adhered have poor warp quality due to ground cracking.

[0030]

[Table 1]

[0031]

According to the present invention, the warp for weaving comprising the lyocell fiber multifilament yarn can provide a fabric having high weaving efficiency and high quality in high-speed weaving, and can reduce the total cost of fabric production. It has an excellent effect of greatly reducing.

Claims (1)

[Claims] 1. A weaving warp using a substantially non-twisted lyocell fiber multifilament yarn, wherein the number of entanglements by interlacing (A) and the amount of glue adhering (B) satisfy the following. Characteristic warp for weaving. 10 / m ≦ (A) ≦ 30 / m 1% by weight ≦ (B) ≦ 4% by weight