JPH0711534A - Bulky spun yarn - Google Patents

Abstract

PURPOSE:To obtain the subject spun yarn having excellent flexibility and bulkiness by spinning staple fibers different in thermal shrinkage into an untwisted core fiber bundle and winding a low-shrinkage yarn around the core bundle. CONSTITUTION:A low-shrinkage yarn of less than 5% shrinkage in boiling water is winding around the substantially untwisted core fiber bundle comprising high-shrinkage staple fibers of more than 1% thermal shrinkage and low- shrinkage staple fibers of less than % at a weight ratio of 10:90 to 40:60 so that the winding number is in the range from 1.0 to 3.0 in twist coefficient to give the objective high-bulkiness spun yarn of high flexibility. The yarn is suitably used as a material for weaving or knitting fabrics for measuring and thermal insulation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulky spun yarn suitable for use in various bulky clothing.

[0002]

2. Description of the Related Art Bulky yarns are required to obtain heat-retaining and soft outerwear and underwear.
Conventionally, in order to impart bulkiness, it has been carried out by reducing the twisting coefficient during spinning to make a sweet twist, or by spinning a fiber having a large crimp as a raw material to give a woven or knitted fabric and imparting bulkiness.

Further, a high-shrinkage staple fiber and a low-shrinkage staple fiber are mixed-spun to form a bulky spun yarn, or a yarn made of a high shrinkage fiber and a yarn made of a low shrinkage fiber are twisted together. Things were also being done.

A woven or knitted fabric is formed from these yarns, and then heat-treated to shrink the high shrinkable fibers, thereby allowing the low shrinkable fibers to have a slack and to develop voids between the fibers to make the woven or knitted fabric bulky. Is given.

[0005]

The prior art sweet twisted yarn is
There were many yarn breakages during spinning, the weaving and knitting properties were poor, and the soft texture was not sufficient from the viewpoint of bulkiness.

Further, in the case of a yarn using a fiber having a large crimp as a raw material, the restraint of the twist of the yarn reduces the voids between the fibers, and the bulkiness cannot be realized.

A yarn obtained by mixing and twisting a high-shrinking staple fiber and a low-shrinking staple fiber and twisting them or twisting them both heat-treat the high-shrinking staple fiber, but the yarn has a twist. The result is that the low shrinkage staple fiber also fills the voids of the yarn along the twist angle, and although the shrinkage in the longitudinal direction of the yarn is expressed, a bulky yarn in which the voids of the fiber itself are improved can be obtained. There wasn't.

The present invention overcomes the drawbacks of conventional yarns and utilizes the properties of highly shrinkable staple fibers, but does not simply shrink the yarn itself, but rather the behavior of the highly shrinkable staple fibers after heat treatment. However, it is an object of the present invention to provide a bulky spun yarn having a yarn structure in which voids are developed in the low-shrinkage staple fiber to make the fiber bulky.

[0009]

The present invention takes the following means in order to solve the above problems. That is, the present invention provides a substantially non-twisted core fiber bundle composed of highly shrinkable staple fibers having a hot water shrinkage of 10% or more and low shrinkable staple fibers having a hot water shrinkage of 5% or less. , A low shrinkage wound yarn having a hot water shrinkage ratio of 5% or less wound around the outer periphery thereof, and the composition ratio of the core fiber bundle and the wound yarn is 90:10 to 65% by weight. : 35
And the weight% ratio of the high shrinkage staple fiber and the low shrinkage staple fiber in the core fiber bundle is in the range of 10:90 to 40:60, and the winding number of the winding yarn is twisted. The bulky spun yarn is characterized by having a coefficient in the range of 1.0 to 3.0.

The present invention will be described in detail below. In the present invention, the core fiber bundle must be composed of high shrinkage staple fibers having a hot water shrinkage of 10% or more and low shrinkage staple fibers having a hot water shrinkage of 5% or less. This is because when the bulky spun yarn is heat-treated, when the highly shrinkable staple fiber shrinks, the low shrinkable staple fiber has a void at the same time to express the bulkiness. In this connection, the high shrinkable staple fibers must have a hot water shrinkage of 10% or more, preferably 20% or more, while the low shrinkable staple fibers must have a hot water shrinkage of 5% or less. I have to. For these reasons, the difference in shrinkage of staples is used to express the bulkiness, but in order to obtain sufficient bulkiness, the difference in shrinkage between the high shrinkage staple and the low shrinkage staple is 5 to 15% or more. It is preferably 10 to 20% or more. However, even if the difference in shrinkage can be secured, if the hot-water shrinkage ratio of the low-shrinkage staple exceeds 5%, the entire yarn shrinks and the knitting structure becomes a high density, and the desired bulkiness cannot be obtained. This is because.

The weight percentage of the high-shrinkage staple fiber and the low-shrinkage staple fiber constituting the core fiber bundle is 1
It must be in the range 0:90 to 40:60. When the content of the highly shrinkable staple fibers is less than 10% by weight, the voids due to the low shrinkable staple fibers after the heat treatment are insufficient and the bulkiness cannot be obtained. On the other hand, when it exceeds 40% by weight, the voids due to the low shrinkable staple fibers are obtained. However, it is not preferable because hand-hardening is observed due to an increase in the ratio of highly shrinkable staple fibers, and it is difficult to obtain a soft feeling and bulkiness. From this meaning, it is preferable that the highly shrinkable staples account for 15 to 25% by weight in the core fiber bundle.

In the present invention, in order to shrink the high-shrinkage staple fibers and at the same time to make the low-shrinkage staple fibers have voids to express the bulkiness, it is preferable to have a non-twisted structure that is not restricted by twisting. However, in the completely untwisted state, the yarn strength as a spun yarn cannot be obtained, and the low-shrinkage staple fiber hardly forms voids.

Here, in order to provide the low-shrinkage staple fibers with sufficient voids, when the high-shrinkage staple fibers shrink, the low-shrinkage staple fibers are partially restrained and the low-shrinkage staple fibers are restrained. It is necessary to secure the non-existing portion as a void portion. The core portion is the low-shrinkage wound yarn wound around the outer periphery of the core fiber bundle.

The weight% of the core fiber bundle and the wound yarn is 90:10 to 65:35, preferably 85:15 to 7.
It is 5:25. When the amount of the wound yarn is less than 10% by weight, the texture is good and the bulkiness is exhibited, but the spinnability is poor and the yarn is weak, which is not preferable. On the other hand, if it exceeds 35% by weight, the weight% of the core fiber bundle decreases,
The texture is hard and the expression of bulkiness is insufficient.

The hot water shrinkage of the wound yarn must be 5% or less. This is because the core fiber bundle is tightened by contraction of the wrapping yarn to reduce voids and not hinder bulkiness. The wrapping yarn may be in the form of a multifilament yarn, a monofilament yarn, or a spun yarn, but its thickness must be within the range of the weight percentage of the core fiber bundle and the wrapping yarn.

The core fiber bundle should be substantially twist-free. This must be substantially non-twisted because the presence of twist also causes the low shrink staple fibers to fill the voids of the yarn along the twist angle when the high shrink staple fibers shrink due to the heat treatment. Here, "substantially untwisted" means that the actual twist of 10 t / m or less is applied.

The fineness and average fiber length of the staple fibers constituting the core fiber bundle are preferably 0.5d to
Those having a range of 2.0 d and 25 mm to 50 mm are preferable.

The number of windings of the low shrinkage wrapping yarn wound around the core fiber bundle is 1.0 inch in terms of twist coefficient (K).
To 3.0, preferably 2.0 to 2.5. If the twisting coefficient is less than 1.0, the yarn strength will be low and the spinnability will be poor, such being undesirable. When it exceeds 3.0, the binding of the wound yarn to the core fiber bundle becomes large and the expression of bulkiness is insufficient, which is not preferable.

The bulky spun yarn is obtained by the following method. A high-shrinkage staple fiber and a low-shrinkage staple fiber are mixed in a raw cotton state so as to have a predetermined mixing ratio and made into a roving through a sliver, or a sliver made of a high-shrinkage staple fiber, a low-shrinkage staple. A sliver made of fibers is produced, and then both slivers are mixed and spun at a predetermined mixing ratio, and the mixed sliver is crushed into a roving. Then, when the roving yarn is drafted and run through the hollow holes of the hollow spindle, the low shrinkage wrapping yarn is wound around the drafted roving yarn within a twist coefficient of 1.0 to 3.0.

[0020]

【Example】

Example 1 A highly shrinkable staple fiber having a hot water treatment rate of 15%, 2
0% and 40% acrylic staples were prepared, on the other hand, cotton fibers were prepared as the low-shrinkage staple fibers, and 100 gelene roving yarns (37.4 t / m) with a mixing ratio shown in Table 1 were spun into core fiber bundles. And On the other hand, the cotton yarn shown in Table 1 was used as the wrapping yarn and was
0 bulky spun yarn was spun.

[0021]

[Table 1]

The hot water shrinkage ratios of the high shrinkage staple fiber, the low shrinkage staple fiber and the wound yarn in Table 1 are values measured by the following methods. High and low shrinkage staple fiber hot water shrinkage: JIS
L-1015 (Hot Water Shrinkage) Hot Water Shrinkage of Spun Yarn: JIS L-1095 (Hot Water Shrinkage A Method [Constant Winding Method])

26 inches 22 using the spun yarn obtained in Table 1
After the knitting of the plain knit fabric of G, the hot water treatment at 100 ° C. for 20 minutes and the tumble drying were performed, each item was evaluated and summarized in Table 2.

[0024]

[Table 2]

In Table 2, the spinnability, knitting property, softness and bulkiness were evaluated by the following methods. Spinnability: Number of yarns broken by spinning machine (threads / hour ・ 10s
Judgment based on p) Knitting property: Judgment based on the number of times the knitting machine is stopped (times / hour / table) Soft feeling: Sensory evaluation by 10 people Bulkiness: Judgment based on specific volume (cm ³ / g)

In Table 2, ◎ is extremely good, ○ is good,
Δ indicates bad. In Table 2, No. 1, 2, 3, 4,
All of 5, 6, and 9 were within the scope of the present invention and were good as respective evaluation items. In contrast, No. 7, 8, 1
Nos. 0, 11, and 12 had problems in quality and spinnability.

Comparative Examples 1 to 4 Using the No. 2 roving of Example 1, spun yarns of the same thickness were made by another spinning method and compared.

[0028]

[Table 3]

As is apparent from Table 3, the spun yarn of the present invention was superior in softness and bulkiness as compared with the yarns obtained by other spinning methods having the same mixing ratio and the same count.

[0030]

EFFECTS OF THE INVENTION The bulky spun yarn of the present invention is soft and rich in bulkiness, and is suitably used as a raw material for knitted fabrics for weighing and heat retention.

Claims (1)

[Claims] 1. A substantially non-twisted core fiber bundle composed of highly shrinkable staple fibers having a heat shrinkage of 10% or more and low shrinkage staple fibers having a hot water shrinkage of 5% or less,
A low shrinkage wound yarn wound around the outer periphery thereof with a hot water shrinkage ratio of 5% or less, and the composition ratio of the core fiber bundle and the wound yarn is 90:10 to 65:% by weight. 35, and the ratio of the weight percentage of the high shrinkage staple fiber and the low shrinkage staple fiber in the core fiber bundle is 1
A bulky spun yarn, characterized in that it is at 0:90 to 40:60, and the number of windings of the wound yarn is in a range of a twist coefficient of 1.0 to 3.0.