JPH0813270A - Particular combined filament yarn - Google Patents

Abstract

PURPOSE:To obtain a particular combined filament yarn capable of giving a woven or knit fabric having natural uneven bulkiness without deteriorating the excellent feeling of a woven or knit fabric made of conventional spontaneous elongation fiber. CONSTITUTION:This particular combined filament yarn is produced by interlocking or twisting a heat-shrinkable yarn B with a yarn A having parts to cause spontaneous elongation by heat-treatment and parts shrinking by heat- treatment and containing these two kind of parts in a state alternately arranged in the longitudinal direction of the multifilament.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a special mixed yarn composed of heat-shrinkable yarns and yarns in which spontaneously expanding portions and contracting portions are alternately present.

[0002]

2. Description of the Related Art A heterogeneous shrinkage mixed yarn in which a plurality of multifilament yarns having different heat shrinkages are mixed is disclosed in, for example, Japanese Patent Publication No.
It is well known in Japanese Patent Publication No. 09 and Japanese Patent Publication No. 59-53927.

Woven and knitted fabrics using these different shrinkage mixed yarns are
Due to the heat treatment, the difference in heat shrinkage of the multi-filament appears, giving a feeling of swelling and improving the texture.

However, although such a woven or knitted fabric improves the bulging feeling as compared with a woven or knitted fabric using a normal thread, it is not yet sufficient. The reason for this is that the movement of filaments constituting the different shrinkage mixed fiber is restricted in the state of being restrained by the texture of the woven or knitted fabric, and it is difficult for the difference in yarn length corresponding to the difference in heat shrinkage ratio of each multifilament to occur. is there. Furthermore, since the difference in heat shrinkage in the length direction of each multifilament is constant in the different shrinkage mixed yarn, even if it is a woven or knitted product, the bulging feeling becomes uniform and it is difficult to express a more natural mottled feeling. .

In a broad sense, it can be included in a kind of heterogeneous shrinkage mixed filament yarns, but the fibers exhibiting spontaneous elongation in the entire longitudinal direction of the multifilament (the heat shrinkage shows a negative value) and the heat shrinkage. Japanese Patent Publication No. 4-1
Proposed in the 8051 publication.

A woven or knitted fabric made of such a mixed yarn is different from a woven or knitted fabric using an ordinary different shrinkage mixed yarn, and spontaneously extensible fibers float on the surface of the woven or knitted fabric by heat treatment even under the constraint of the structure. It is bulky and has an excellent texture. However, due to the recent diversification and sophistication of consumer needs, woven and knitted fabrics are often required to have a natural mottled feeling. From this point of view, a multifilament exhibiting spontaneous elongation exhibits uniform elongation characteristics. With these, the woven and knitted fabrics became substantially even and bulky, and a natural uneven feeling was not obtained, and it was not possible to meet various consumer needs.

[0007]

In view of the above situation, the present invention makes use of the excellent bulkiness and texture of a conventional woven or knitted fabric made of a mixed yarn of spontaneously extensible fibers and heat-shrinkable fibers. However, it is a technical subject to provide a special mixed yarn capable of imparting natural bulkiness.

[0008]

The present inventors have arrived at the present invention as a result of earnest research to solve the above-mentioned problems. That is, in the present invention, in the longitudinal direction of the multifilament, a yarn A in which a portion that spontaneously expands and a portion that contracts by heat treatment alternate and a heat-shrinkable yarn B are entangled and / or twisted. The gist is a special mixed yarn that is characterized by being present.

The present invention will be described in detail below.

The special mixed yarn of the present invention is composed of a yarn A and a yarn B. The yarn A has alternating portions of spontaneous expansion and thermal contraction due to heat treatment in the longitudinal direction of the multifilament, and the yarn B
Shows heat shrinkability in the entire longitudinal direction of the multifilament. The mixed fiber forms of the yarn A and the yarn B include entangled yarns, twisted yarns, and entangled yarns.

The yarn A is not particularly limited as long as it is a multifilament composed of a polymer capable of imparting spontaneous elongation, but it is usually a homopolyester typified by polyethylene terephthalate (PET) or a third polyester. A copolyester containing a component is preferably used, and a multifilament made of a polyamide represented by poly-ε-caprolactam (nylon 6) or polyhexamethylene adipamide (nylon 66) or a copolyamide is also used. be able to.

In the yarn A, in the longitudinal direction of such a multifilament, a portion which spontaneously expands by heat treatment (a spontaneously expandable portion) and a portion which thermally contracts (a heat shrinkable portion) are alternately present. is necessary. As a result, it is possible to finish a fabric having a natural bulky spot that has never been seen, while taking advantage of the excellent texture of the conventional woven or knitted fabric made of spontaneously extensible fibers.

The presence of the spontaneously extensible part and the heat-shrinkable part means that the multifilament is allowed to stand in a free state for 5 minutes in boiling water or in a high temperature atmosphere of 100 ° C. or higher,
It means that there is an extending part and a contracting part.

The average spontaneous elongation (under boiling water) of each spontaneously extensible portion of the yarn A may be 0% or more, but it is preferably 2% or more from the viewpoint of the bulkiness of the woven or knitted material (heat shrinkage). In terms of rate, it may be less than 0%, and particularly preferably -2% or less). In order to impart a natural mottled feeling to the woven or knitted fabric, the sum of the average hot water shrinkage rate of each heat shrinkable portion of the yarn A and the average spontaneous stretch rate of the spontaneously stretchable portion (under boiling water),
In other words, the difference between the average hot water shrinkage of each heat shrinkable portion and the average hot water shrinkage of the spontaneously stretchable portion is preferably 5% or more, more preferably 8% or more.

Although it is necessary that the spontaneously extensible portions and the heat-shrinkable portions be present alternately, it is preferable that the spontaneously extensible portions and the heat-shrinkable portions have random lengths. The length of both may be set according to the application, but it is usually preferable that they are within a range of several millimeters to several meters, respectively, and the average length of the spontaneously extensible portion and the average length of the heat-shrinkable portion. It is preferable that the ratio to 40:60 to 95: 5.

The method for producing the yarn A is not particularly limited, but for example, a highly oriented undrawn multifilament obtained by a conventional method is used as a supply yarn, and the supply yarn is sufficiently oriented or crystallized. Without stretching (for example, the stretching ratio is 1.2 times or less, preferably 1.1 times or less),
A method of continuously and intermittently applying water or an aqueous liquid and performing a relaxation heat treatment at a high relaxation rate is industrially easy, and the length of each of the spontaneously extensible portion and the heat shrinkable portion can be freely controlled. Therefore, it is most preferable. In this case, the non-watered part highly shrinks in the relaxation heat treatment step to become a spontaneously stretchable part, and the watered part does not shrink so much due to the heat shielding effect of water and becomes a heat-shrinkable part.

Next, as the yarn B constituting the special mixed yarn of the present invention together with the yarn A, the yarn B which exhibits heat shrinkability in the entire longitudinal direction is usually of the same type as the polymer constituting the yarn A. It is preferable to use a multifilament composed of the above polymer, but a multifilament composed of a different kind of polymer or a spun yarn may be used depending on the purpose.

The yarn B may be produced by a conventional polymerization, spinning, drawing or spinning method, and the heat shrinkage ratio of the yarn B can be controlled by appropriately setting the conditions of each step. it can.

The hot water shrinkage of the yarn B is preferably 5% or more in order to impart bulkiness or bulkiness to the woven or knitted fabric. The difference in hot water shrinkage between the yarn B and the spontaneously stretchable portion of the yarn A is preferably 5% or more, and particularly preferably 7% or more.

The difference in hot water shrinkage between the yarn B and the heat-shrinkable portion of the yarn A may be appropriately selected according to the purpose. When the absolute value of the difference in hot water shrinkage between the heat-shrinkable portion of the yarn B and the yarn A is 5% or less, the spontaneously stretchable portion of the yarn A and the portion of the yarn B that are mixed are bulky. Next to
The portion of the yarn A in which the heat-shrinkable portion and the yarn B are mixed becomes a slightly flat portion, so that it is possible to obtain a woven or knitted fabric in which bulky spots are relatively emphasized among natural spots. Further, when the absolute value of the difference in hot water shrinkage between the yarn B and the heat shrinkable portion of the yarn A exceeds 5%, the portion where the heat shrinkable portion of the yarn A and the yarn B are mixed It is possible to obtain a woven or knitted fabric having an increased bulge and having a mild bulky spot.

As described above, by appropriately combining the spontaneous stretchable portion, the heat shrinkable portion of the yarn A and the thermal shrinkage ratio of the yarn B, the spontaneous stretchable portion and the heat shrinkable portion of the yarn A can be further combined. By selecting the length of
It is possible to obtain special mixed yarns that are woven and knitted fabrics having various bulkiness spots.

When the special mixed yarn of the present invention is used alone,
Since the yarn A has a spontaneously extensible portion, the yarn B has a residual elongation of 50% or less in order to obtain a mixed fiber having good morphological stability, particularly stable against tensile tension. Although it is preferable to use drawn yarns, when the special mixed fiber of the present invention is used in combination with other yarns such as drawn yarns, yarn B
Is not necessarily a drawn yarn. Also, thread A and thread B
The component may be composed of either a single polymer or a plurality of polymers (for example, side-by-side type, core-sheath type composite yarn), and the cross-sectional shape of the fiber is not particularly limited.

In the special mixed yarn of the present invention, it is necessary that the yarn A and the yarn B are entangled, twisted, or twisted after the entanglement. Thread A and Thread B
If they are simply aligned, the focusing properties will be inferior, which will cause problems in processability and handling.

When the yarn A and the yarn B are entangled with each other, they are aligned and a commercially available interlace nozzle is used under the general conditions of an overfeed rate of 0 to 5% and an air pressure of 1 to 5 kg / cm ^2. It should be processed, and the number of confounding is usually 5
~ 100 / m is preferred. Regarding the entanglement treatment between the yarn A and the yarn B, a method of producing the yarn A using the same processing machine and then continuously entangling the yarn B, after obtaining the yarn A, Any method such as a method of separately entangling the yarn B may be adopted.

When the yarn A and the yarn B are twisted together, or when the entangled mixed yarn of the yarn A and the yarn B is twisted, it may be carried out by using an ordinary plying yarn twisting machine or twisting machine. it can. The number of twists depends on the characteristics and fineness of the yarns A and B, but is usually in the range of 300 to 1500 T / m. Number of twists 2000
If it is higher than T / m, the spontaneously extensible portion of the yarn A may be excessively stretched and the spontaneous elongation may be reduced or disappear, which is not preferable.

Next, an example of a method for producing the yarn A which constitutes one of the special mixed yarns of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic process diagram showing an example of a method for producing the yarn A. In FIG. 1, a highly oriented undrawn yarn 1 which is a supply yarn
Is pulled out to the stretching region by the feed roller 2 and the first roller is fed between the feed roller 2 and the first delivery roller 4.
While being heated by the heater 3, it is stretched without being sufficiently oriented or crystallized.

Then, the water jet nozzle 5 intermittently
Water or an aqueous liquid is preferably applied in a random cycle, and relaxation heat treatment is performed between the first delivery roller 4 and the second delivery roller 7 by the second heater 6 to alternately have the spontaneously extensible portion and the heat shrinkable portion. It becomes the yarn A and is wound up on the package 9 by the winding device 8. The yarn A obtained above is subjected to the entanglement treatment or the twist treatment or the entanglement treatment and the twist treatment with the heat-shrinkable yarn B to be the special mixed yarn of the present invention.

In the present invention, the method for measuring the spontaneous elongation rate of the portion that spontaneously elongates by heat treatment and the thermal contraction rate of the portion that contracts in the longitudinal direction of the yarn A are as follows.

The yarn A alone, which has not been entangled or twisted with the yarn B, is sampled, marked at intervals of 1 cm under a load of 2/1000 g / d, and then boiling water for 5 minutes in a free state. After processing, the mark spacing after processing is measured under a load of 2/1000 g / d. Calculate the spontaneous elongation rate from the average value of 50 pieces where the mark spacing is longer than 1 cm, and the heat shrinkage rate as a percentage (%) from the average value of 50 pieces that are shorter than 1 cm.

[0031]

EXAMPLES Next, the present invention will be specifically described by way of examples.

Examples 1-2, Comparative Examples 1-2 PET highly oriented undrawn yarn 110d / 36f having a hydrothermal shrinkage of 46% obtained by a conventional method was used as a feed yarn and the process shown in FIG. 1 was followed. The yarn A and a comparative yarn were obtained by processing under the conditions shown in Table 1. In the obtained yarn A and the comparative yarn, the spontaneous elongation rate of the spontaneously extensible portion, the hot water shrinkage rate of the heat-shrinkable portion, the lengths of both portions (the lengths of the respective portions were set to be random) The results are also shown in Table 1.

[0033]

[Table 1]

Next, the yarn A and the comparative yarn were PET obtained by a conventional method and having a hot water shrinkage of 8.2% and a breaking elongation of 38%.
Entangled or twisted with the drawn yarns 75d / 24f (yarn B) to obtain various mixed yarns. For the confounding process, a commercially available interlaced nozzle was used and the overfeed rate was 2.0.
%, Air pressure 2.0 kg / cm ²
It was applied at 500 T / M.

Each of the mixed yarns was used as a warp yarn and a weft yarn, and after weaving with a flat design, a dyeing finishing process was performed to obtain a warp density of 112 / 2.5
A woven fabric with a 4 cm weft density of 75 threads / 2.54 cm was obtained. Examples 1 and 2
The woven fabric obtained in step 1 had a high bulkiness as a whole, but showed natural bulky spots, and was excellent in natural feeling, warm feeling, and touch feeling.

On the other hand, as a yarn for the yarn A, after being drawn,
The woven fabric obtained in Comparative Example 1 using the yarn having only the spontaneously extensible portion obtained by the relaxation heat treatment had bulkiness but did not show uniform and natural spots. In addition, thread A
The woven fabric obtained in Comparative Example 2 using a heat-shrinkable yarn obtained by drawing water 1.4 times and then intermittently wetting and heat treating the yarn for which the bulkiness was insufficient. Met.

[0037]

EFFECTS OF THE INVENTION The special mixed yarn of the present invention comprises a yarn A in which spontaneously extending portions and heat shrinking portions are alternately present in the longitudinal direction of the multifilament, and a heat shrinkable yarn B.
Since and are entangled and / or twisted, when they are knitted or woven, the spontaneously stretchable portion and the heat shrinkable portion of the yarn A respectively show different yarn length differences from the yarn B, and It is possible to obtain a woven or knitted fabric having natural bulkiness without impairing the excellent feeling of the woven or knitted fabric made of the spontaneously extensible fiber.

[Brief description of drawings]

FIG. 1 is a schematic process drawing showing an example of a method for producing a yarn A that constitutes one of the special mixed fiber of the present invention.

[Explanation of symbols]

 1 Highly oriented undrawn yarn 3 First heater (for drawing) 5 Water jet nozzle 6 Second heater 9 Package

Claims (1)

[Claims] 1. In a longitudinal direction of a multifilament, a yarn A in which a portion that spontaneously expands and a portion that contracts by heat treatment alternately exist and a heat-shrinkable yarn B are entangled and / or twisted. Special mixed yarn that is characterized by