JP2000256933A - Composite combined filament yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a composite combined filament yarn capable of preventing single filament breakage from occurring at the time of producing a textured yarn without breaking and causing fluffs when knitted and woven and capable of providing a spunlike and soft touch feeling when formed into a fabric and further providing a uniform surface without skitteriness due to a small difference in color after dyeing. SOLUTION: An undrawn highly oriented polyester yarn having 90-150% breaking elongation and >=1 denier single filament fineness is subjected to drawing at <=1.3 times draw ratio without being heated and the resultant yarn is then doubled with an undrawn highly oriented polyester yarn having 70-120% breaking elongation and <=1 denier single filament fineness. The doubled yarns are then subjected to draw simultaneous false twist texturing at 1.1-1.5 draw ratio and subsequently subjected to a fluid interlacing treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a composite mixed yarn having a uniform surface after dyeing and suitable for obtaining a spun-like and soft fabric.

[0002]

2. Description of the Related Art Two highly oriented undrawn yarns having different elongations are used as supply yarns, and they are aligned and false twisted, so that a high elongation yarn is used as a sheath yarn and a low elongation yarn is used as a core yarn. Many methods have been proposed for producing composite processed yarns having a two-layer structure. However, in the composite processed yarn obtained by this method, a yarn length difference occurs between the core yarn and the sheath yarn, and when tension is applied during knitting and weaving, the sheath yarn is displaced, and a lump of the sheath yarn is scattered in the longitudinal direction. Since the fabric is knitted and woven in a state, the resulting fabric has a disadvantage.

In order to solve this problem, Japanese Patent Publication No.
In Japanese Patent Publication No. 21970, a method of performing entanglement treatment on a composite processed yarn obtained by subjecting two highly oriented undrawn yarns having different elongations to draw and false twisting is described in Japanese Patent Publication No. 61-19733. A method has been proposed in which two highly oriented undrawn yarns having different elongations subjected to false twisting are subjected to a twisting process. The composite processed yarn obtained by these methods does not generate a lump due to displacement of the sheath yarn.

However, in these methods, it is necessary to perform a strong entanglement treatment before or after subjecting to false twisting so that the sheath yarn does not shift. Due to its weakness, there was a lot of single thread fluff.

Further, in a combination of a yarn having a large single-filament fineness and a yarn having a single single-filament fineness, since the thin yarn is well oriented during spinning, the residual elongation is low. Because of the strong effect, there is a drawback that the generation of fluff is large. Also, since the elongation difference is not eliminated,
It had a color difference after dyeing.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional composite yarn, prevents the occurrence of single yarn breakage during the production of the yarn, and prevents the generation of fluff during knitting and weaving. In the case of fabrics, it is technically necessary to provide a method for producing a composite mixed yarn that has a spun-like soft feel and a small difference in color after dyeing, so that there is no irritability and the surface is uniform. Issues.

[0007]

Means for Solving the Problems The present inventors have made intensive studies to solve the above problems, and as a result, have reached the present invention. That is, the present invention has a cutting elongation of 90 to 150%.
Then, the polyester highly oriented undrawn yarn having a single yarn fineness of 1d or more is subjected to a drawing treatment at a draw ratio of 1.3 or less without heating, and then the yarn and the cut elongation are 70 to 120%.
Then, the single yarn fineness is 1d or less, and the polyester highly oriented unstretched yarn is aligned and stretched at a draw ratio of 1.1 to 1.5 times, and then subjected to simultaneous simultaneous false twisting, and then subjected to a fluid entanglement treatment. The gist of the present invention is a method for producing a composite mixed fiber.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

First, in the present invention, the polyester highly oriented undrawn yarn supplied to the drawing step has a cut elongation of 90 to 1%.
If the elongation at break is less than 90%, the elongation after the stretching treatment is too low, and the generation of fluff during false twisting increases. On the other hand, if the elongation at break exceeds 150%, it is likely to change over time, and the yarn is thermally degraded, and yarn breakage and fluff frequently occur.

On the other hand, the single yarn fineness not subjected to the stretching treatment is 1 d
The cutting elongation of the following highly oriented polyester undrawn yarn is 70 to
When the elongation at break is less than 70%, the dyeability after false twisting becomes light-dyeing, causing a color difference between the yarn and the yarn to be aligned, resulting in irritation. Also,
If the elongation at break exceeds 120%, the spinnability is poor, and the fluff is frequently generated during false twisting due to thermal deterioration. In addition,
The polyester in the present invention is polyethylene terephthalate, polybutylene terephthalate, or a copolymer of these with a small amount of a third component.

In the present invention, of the two polyester highly oriented undrawn yarns described above, the stretching treatment is performed on the highly oriented undrawn yarn having a single yarn fineness of 1d or more. It is necessary to set the stretching ratio to 1.30 times or less without giving. When heat is applied in the drawing process, in the subsequent false twisting process, the yarn with the larger single-fiber fineness cannot be arranged on the core side of the composite false-twisted yarn by shrinkage, resulting in a reduced softness. I do. Further, the dyeability is improved by heat, and a difference in dyeability from the yarn having a finer single yarn fineness occurs. Next, when the stretching ratio exceeds 1.30 times, fluff is generated at the time of false twisting, which causes the machine to stop during knitting and weaving, and pilling is liable to occur on the fabric. Further, if the stretching ratio is not more than 1 times, that is, if the stretching is not performed, a difference in dyeing property between the single yarn fineness and the thinner yarn occurs, so that the fabric is irritated, and in the next step, the cutting elongation is It is not possible to arrange a low fine single-filament yarn on the sheath side of the composite false twisted yarn.

In the present invention, the thick single yarn fineness yarn drawn as described above and the highly oriented undrawn yarn of the fine single yarn fineness not subjected to the drawing treatment are aligned, and the draw ratio is 1.1 to 1.0. 1.5
At the same time, a double false twisting process is performed to obtain a composite false twisted yarn in which the thick single yarn fineness yarn that has been stretched is disposed on the core side and the fine single yarn fineness yarn is disposed on the sheath side.

The above false twisting conditions are not particularly limited as long as the stretching ratio is 1.1 to 1.5 times. For example, in the case of friction false twisting, the draw ratio is 1.2 to 1.5 times, the ratio (X / Y) of the disk surface speed X to the yarn speed Y is 1.5 to 2.2, and the heater temperature is 160 to 2
The conditions of 00 ° C and the yarn speed of 400 to 1000 m / min are preferred. In the spindle type false twisting machine, the draw ratio is 1.1 to 1.3 times, the number of false twists (15000 to 28000).
/ D ^1/2 (T / M) (D is the total fineness of two yarns: denier), heater temperature 160 to 200 ° C, yarn speed 80 to 35
The condition of 0 m / min is preferred.

The thick single yarn fineness yarn which has been subjected to the drawing treatment and the cut elongation has become equal to or less than the high oriented undrawn yarn having the fine single yarn fineness not subjected to the drawing treatment is subjected to shrinkage after the drawing treatment at the time of false twisting. To form a core portion, exhibit a spun-like effect in combination with the fineness, and a soft feeling is provided by the fine single yarn fineness yarn arranged on the sheath side.

In the present invention, the composite false twisted yarn obtained above is subjected to a fluid entanglement treatment to obtain a target composite yarn. The confounding method may be any of an interlacing method of forming a converging shape and a Taslan method of forming a loop or a slack.

In the present invention, since the yarn length difference between the two yarns constituting the composite false twisted yarn obtained by false twisting is small, the yarn can be used as it is without performing fluid entanglement. In order to effectively realize the spun-like feeling due to the physical property difference between the yarns of the book on the fabric, a fluid entanglement treatment is applied to the fabric.
It is necessary to entangle the yarns of the book.

The fine single-filament fine yarn constituting the composite false twisted yarn is liable to generate fluff due to air pressure during the fluid entanglement treatment. For this reason, in the present invention, the fine single-filament fine yarn is subjected to false twist processing so that the drawing does not reach a large extent. However, as a condition for the fluid entanglement treatment, in the case of the interlace method, the overfeed rate is 1%. ~ 7%, air pressure is 1
It is preferable to select from the range of ４4 kg / cm ² , and it is preferable to impart 30 to 100 entangles / m to the composite mixed yarn. If the number of entangled composite yarns is less than 30 / m, 2
The physical property difference between the yarns of the book tends to be hardly realized. Further, if the number of confounds exceeds 100 pieces / m, the generation of cutting fluff frequently occurs, and the soft feeling tends to decrease. Therefore, in order to prevent the generation of cutting fluff, it is particularly set to 30 to 50 pieces / m. Is preferred.

On the other hand, when the fluid entanglement process is the Taslan method, the air pressure is set to ² to 7 kg / cm ^2, and the formation of loops having a height of 0.3 mm or more and 30 or more / m in the yarn is a soft method. This is preferable because the feeling can be enhanced. In this case, it is preferable to increase the draw ratio of the thick single yarn fineness yarn during the drawing process and to decrease the draw ratio of the fine single yarn fineness yarn during the simultaneous false twisting process, in order to reduce the generation of cut fluff. .

[0019] 2 constituting the composite mixed fiber obtained in the present invention.
The color difference between yarns after dyeing is within the third class (that is, 3-5
Grade: Grade 5 has no color difference). Color difference after dyeing is 3
"Within grade" means that the composite false twisted yarn before fluid entanglement treatment is separated into two constituent yarns, each of which is knitted, and then a disperse dye (manufactured by Mitsubishi Chemical Corporation: Diamonds Blue UN-SE). 2
% Owf, a value of 3 determined on the basis of the gray scale for discoloration and fading (JIS0804) is 3
It is within the class. Since this determination is performed on a knitted fabric dyed at 100 ° C., the color difference between the two yarns is large, but dyeing with a fabric is usually performed at a high temperature of 130 ° C. and high pressure.
The color difference is smaller than that of the dyeing at 00 ° C., and if the judgment at 100 ° C. is within the tertiary difference, the fabric will not be irritated.

[0020]

Next, the present invention will be described in detail with reference to examples.

Examples 1-2, Comparative Examples 1-4 Highly oriented undrawn yarn (80d / 24f) having a cutting elongation of 112.9% and a single yarn fineness of 3.3d obtained by high-speed spinning of polyethylene terephthalate; A highly oriented undrawn yarn (80d / 160f) having a cut elongation of 95.1% and a single yarn fineness of 0.5d was used as a supply yarn and processed under the conditions shown in Table 1 to obtain a composite mixed yarn.

Next, the obtained composite mixed yarn was subjected to a warp density of 1
05 yarns / 2.54 cm, weft density 72 yarns / 2.54 cm
Was woven, and the obtained woven fabric was dyed and finished in accordance with the dyeing and finishing of ordinary polyethylene terephthalate-treated yarn woven fabric. Table 1 also shows the evaluation results of the obtained composite mixed yarn and the woven fabric.

[0023]

[Table 1]

As is clear from Table 1, in Examples 1 and 2, a woven fabric with a soft feeling was obtained, in which the composite mixed yarn had less fluff, had a good spun-like feeling, and was soft. In the woven fabric No. 2, the softness was further improved because the fine single-filament yarn had loops and slack.

On the other hand, in Comparative Example 1, since the draw ratio of the thick single-fiber fineness yarn was high, fluff was frequently generated during false twisting, and fluff was generated during weaving, resulting in inferior quality of the obtained woven fabric. Was something. Further, Comparative Example 2 was inferior in both spun-like feeling and soft feeling because it did not include a yarn having a single yarn fineness of 1 d or less. Furthermore, in Comparative Example 3, since the thick single yarn fineness yarn was subjected to false twisting without being subjected to the stretching treatment, the fluff of the fine single yarn fineness yarn frequently occurred, and the color difference between the two yarns was large. The fabric was irritated. In addition, the feeling is tight, there is no waist, and the span-like feeling is poor,
The softness was also slightly inferior.

[0026]

As described above, according to the present invention, a drawing treatment is performed without applying heat to a highly oriented undrawn yarn having a high cut elongation and a large single yarn fineness, and the yarn and a polyester having a fine single yarn fineness are applied. Since it is subjected to fluid entanglement after the simultaneous drawing and false twisting with the highly oriented undrawn yarn, the resulting composite mixed yarn has a thick single yarn fineness yarn for the core yarn and a fine single yarn fineness yarn for the sheath yarn. Yarns are arranged, and a spun-like feeling and a soft feeling can be imparted to a fabric obtained by knitting and weaving.

In the present invention, of the two supply yarns,
The stretch elongation is high and the dense dyeing highly oriented unstretched yarn is stretched without applying heat, and then false twisted. Therefore, even if the obtained composite mixed yarn fabric is dyed, it has two constituent yarns. There can be no unevenness due to the color difference between them, and the surface can be made a clean and uniform cloth.

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 4L036 MA05 MA26 MA33 PA03 PA15 PA33 PA41 PA46 UA02 4L048 AA20 AA21 AA34 AA49 AB08 AB09 AB21 BA01 BA02 CA04 CA15

Claims (1)

[Claims] 1. A highly oriented polyester unstretched yarn having a cut elongation of 90 to 150% and a single yarn fineness of 1d or more is subjected to a stretching treatment at a draw ratio of 1.3 or less without heating, and then the yarn is stretched. The filament and the high elongation unstretched polyester yarn having a cutting elongation of 70 to 120% and a single yarn fineness of 1 d or less are aligned and subjected to simultaneous false twisting at a stretching ratio of 1.1 to 1.5 times. A method for producing a composite mixed yarn, comprising performing a fluid entanglement process after the application.