JPS6311452B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has tightly focused parts that are tightly focused and bulky focused parts that are gently focused alternately, and has a color tone effect that has shirring characteristics, flexibility, and heterochromaticity. The present invention relates to a composite false-twisted yarn suitable for obtaining knitted fabrics with both functions.

False-twisted yarns of thermoplastic synthetic fibers have traditionally been used in the knitting and textile field as they have the characteristics of being stretchable and bulky. Consumer preference for disliking artificial textures such as wax-like textures has become stronger, and many improvements have been attempted in recent years. For example, many yarns have been proposed that have a difference in fineness in the longitudinal direction, a difference in color shading, a different color, a difference in crimp, etc., but most of them have poor production efficiency. It has drawbacks such as unstable quality and relatively high cost.

Furthermore, there have been many proposals regarding partial fusing of false twists, but all of these utilize the shirring texture of the fusing yarn, and almost none of them have a fancy effect. For example, in Japanese Patent Publication No. 46-5261, two types of yarns with different melting points are aligned and false-twisted, and a winding yarn with a lower melting point than the core yarn is fused and wound to create a crimped yarn with alternate twists. A manufacturing method is proposed. Mata Tokuko Showa 48-
In Publication No. 9227, thermoplastic fibers and other thermoplastic fibers with different melting points form fine curls and are arranged around them while intertwining with each other, and the incompletely fused parts form large curls. A fused crimped thread has been proposed. However, these yarns do not have tight bundled parts with real twist in the same direction as the false twisting direction and bulky bundle parts with real twist in the false twisting and untwisting directions in the longitudinal direction of the yarn. You won't get the fancy effect right away.

The present invention is intended to eliminate the various drawbacks of the prior art, and its purpose is to provide a tight bundled portion in which the yarn is tightly wound along the longitudinal direction and a bulky bundled portion in which the yarn is loosely wound. A composite false-twisted yarn suitable for obtaining knitted fabrics with an extremely varied appearance and texture in which low-melting point yarns and high-melting point yarns are tightly bundled without separation and are present alternately. It is on offer.

The present invention has the following configuration to achieve the above object.

That is, the present invention has a core of a low melting point yarn in which some or all of the single filaments are fused and bundled.
The high melting point yarn is tightly wound around the outside of the low melting point yarn with real twist in the same direction as the false twisting direction, and the low With a melting point yarn as a core, a bulky convergent portion is formed by winding the high melting point yarn loosely around the outside of the low melting point yarn in real twist in the false twisting/untwisting direction without being dispersed, in the longitudinal direction of the yarn. The present invention relates to a composite false twisted yarn characterized by having alternating twisted yarns.

The present invention will be explained in detail below.

The composite false-twisted yarn of the present invention is obtained by aligning low-melting point yarn and high-melting point yarn made of thermoplastic synthetic fibers and simultaneously supplying them to a false-twisting area. The yarn has tightly bundled portions and bulky bundled portions alternately in the longitudinal direction of the yarn.

That is, as shown in the figure, the composite false twisted yarn of the present invention has tightly bundled parts 1 with a small apparent fineness and bulky bundled parts 2 with a thick apparent fineness alternately in the longitudinal direction of the yarn, and the tightly bundled parts 1 is a core of a low melting point yarn 3 in which some or all of the single filaments are fused and twisted in the same direction as the false twisting, and a high melting point yarn 4 is false twisted and twisted around the core. The fibers are twisted in the same direction, forming a tightly wound shape. In addition, the bulky converging section 2 has a core of low-melting point yarn 3', which is formed by twisting the single filaments in a direction opposite to that of false twisting, with almost no fusion, and a high-melting point yarn 4 around the yarn. ′ is loosely twisted in the opposite direction to the false twisting, resulting in a bulky and focused form.

It is preferable that the length of the densely bundled part and the bulky bundled part be relatively long in order to obtain a fancy effect, but in order to increase the length, the overfeed rate should be made as high as possible, and the number of false twists should be set to the normal twist. It is best to set it slightly lower than the number. According to the inventor's experimental results, the overfeed rate is 10% or more, preferably 15 to 35%, and the number of false twists is 20000/√D to 35000/√D (
T/M) [D is the total fineness of the drawn and supplied yarn. ], and when the overfeed rate is less than 10% and when the number of false twists exceeds 35000/√D (T/M), the length of both the above-mentioned converging parts becomes short and the fancy is reduced. In addition to being less effective, there are also drawbacks such as easy separation of the low-melting point yarn and the high-melting point yarn. In addition, when the false twist number becomes extremely low and goes below 20000/√D (T/M), the crimp forming ability of the bulky converging part is low, resulting in an apparently thin part (tightly bundled part) and an apparently thick part (bulky convergent part). ) becomes small, the fancy effect is not obtained, and the texture is slimy, making it difficult to obtain a desirable result.

In addition, in the yarn of the present invention, when the ratio of the tightly bundled part and the bulky bundle part of the yarn is at a certain specific ratio, that is, when the ratio of the tightly bundled part measured per 1 m of yarn is 20 to 50%, it is extremely Not only can an excellent fancy effect be obtained, but also extremely excellent bundling of the low melting point yarn and the high melting point yarn. As described above, the yarn of the present invention can be achieved by appropriately selecting processing conditions such as overfeed rate, number of false twists, and heater temperature in accordance with the physical properties of the supplied yarn.

The reason why the characteristic shape of the yarn of the present invention is formed is that the low-melting point yarn and the high-melting point yarn made of thermoplastic synthetic fibers are brought together and the temperature at the same time is above the softening point of the low-melting point yarn and near the melting point of the low-melting point yarn. Moreover, since the false twisting process is performed under conditions of a high overfeed rate, the low melting point yarn shrinks by an amount approximately corresponding to the false twist overfeed rate due to thermal melting, while the high melting point yarn has a shrinkage performance due to heat. At the processing temperature, it is much less melted than the low melting point yarn, so it maintains its normal crimped form and wraps around the outside of the low melting point yarn to compensate for its excess length. This is thought to be because. Therefore, it is desirable that the melting point difference between the low-melting point yarn and the high-melting point yarn is 10°C or more, and when the melting point difference is 10°C or less, the temperature should be above the softening point of the low-melting point yarn or near the melting point, and at the same time have a high overflow. When false twisting is performed at the yield rate, the high melting point yarn is also affected by thermal melting and undergoes thermal contraction close to the amount of false twist overfeed, and the difference in thermal convergence between the low melting point yarn and the high melting point yarn is small. , the winding effect of the high melting point yarn is reduced.

As described above, the yarn of the present invention has a form in which the high melting point yarn is wound around the outside of the low melting point yarn by twisting in the false twisting direction and the untwisting direction. The yarns are not intertwined with each other, and the high melting point yarns are not uniformly dispersed around the low melting point yarns.
Furthermore, as a characteristic brought about by the unique processing conditions, the part where the actual twist in the twisting direction remains is not uniformly melted in the longitudinal direction, but is strongly melted. It exhibits a strongly twisted form as a tightly bundled part on the outside, and the actual twisted part that remains gently in the untwisting direction has a low melting degree or is not melted, and the high melting point yarn is formed with the low melting point yarn as the core. The yarn of the present invention has a bulky shape that is gently wound on the outside, and the yarn of the present invention has a low melting point yarn made of thermoplastic synthetic fibers that has a difference in shrinkage performance due to heat from a high melting point yarn, and also has a high fusion false twist. This is a clever application of the unique processing characteristics achieved by performing the process under overfeed.

Next, the characteristics and effects of the yarn of the present invention will be described.

1. The yarn of the present invention alternates in the longitudinal direction with tightly bundled portions that appear thin and have an appropriate length and bulky bundle portions that appear thick and have an appropriate length, giving a fancy effect.

2. The low-melting point yarn and the high-melting point yarn made of thermoplastic synthetic fibers are bundled together without being separated, giving a heathered effect with different dyeing properties.

3. A sagging taste due to a tightly bundled part in which the high melting point yarn is tightly wound around the core of the low melting point yarn with some or all of the single filaments fused to the outside by twisting in the same direction as the false twisting. A bulky bundle consisting of a low-melting point yarn that is crimped and bundled with almost no fusion of individual single filaments, and a high-melting point yarn wrapped around the core by twisting in the false-twisting/untwisting direction. Therefore, in addition to the above-mentioned fancy effect, it is possible to create a product with an extremely novel and elegant appearance and texture that has an appropriate degree of shear, flexibility, and bulkiness. can get.

4 Because it is obtained by false twisting at an extremely high overfeed rate compared to conventional fused false twisting,
Since the false twisting temperature can be lowered even when the same smooth feel is obtained, the yarn quality is stable and the yarn strength is high.

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

Example 1 Polyester 75d/48f bride yarn and nylon
Arrange 70d/24f semi-dull yarns and use a commercially available spindle-type false twister to twist the spindle at 150,000 revolutions.
rpm, false twist number 2360 ^S (T/M), first heater temperature
215℃, 1st overfeed rate 22.4%, 2nd overfeed rate 5%, 2nd heater temperature 210℃,
False twisting was performed at a winding rate of 5% to obtain a processed yarn having the following characteristics.

1 The processed yarn has tightly bundled parts and bulky bundled parts alternately in the longitudinal direction of the yarn, and the tightly bundled parts are formed by fusing and bonding some or all of the single filaments of the nylon yarn in the false twisting direction. The fibers are tightly bundled with a real twist, and the polyester thread is tightly wound around the outside of the thread with a real twist in the same direction as the false twisting direction. On the other hand, in the bulky bundled part, most of the single filaments of the nylon yarn are not bonded and are twisted in the opposite direction to the tightly bundled part, and the polyester yarn is twisted in the direction of false twisting and untwisting around the yarn as a core. It is twisted and wrapped loosely.

2. The lengths of the densely bundled part and bulky bundled part of 5 m of yarn were measured and the results were as follows.

Tightly bundled part: 2 to 26 mm, average 18mm Bulky bundled part: 3 to 57mm, average 27mm
The threads were tightly bundled in the tightly bundled portion without separation.

4 Apply a load of 0.1 g/d to the obtained processed yarn,
Measure the length between the indentations of a length of 50cm, and separate the two yarns, the low melting point yarn (86 denier) and the high melting point yarn (75 denier), without giving any plastic deformation to the length of the indentation length. The results of measuring the length by applying a load of 0.1g/d to each are Γ low melting point yarn (nylon 70d/24f semi-dull yarn)
…50cm Γ high melting point yarn (polyester 75d/48f bright yarn) …58.2cm.

Next, a knitted fabric is made using the processed yarn and dyed.As a result, the thick and thin threads and different dyeing properties of the yarn give a very elegant fancy effect to the surface of the product fabric as natural spots. By combining the subdued luster of polyester bright yarn with the appropriate amount of silkiness and flexibility, a product with a unique appearance and texture never seen before was obtained.

Example 2 A nylon filament 100d/24f semidal yarn and a polyester filament 75d/24f semidal yarn were aligned and at the same time, a first delivery speed of 75 was applied using a false twisting device having a compressed fluid injection swirl flow nozzle.
m/min, air pressure 2.0Kg/cm ² , overfeed rate 28.6%, heater temperature 210℃, false twist direction S
A processed yarn having the following characteristics was obtained by false twisting under the following conditions.

1 The processed yarn has tightly bundled parts and bulky bundled parts alternately in the longitudinal direction of the yarn, and the tightly bundled parts are formed by fusing and bonding some or all of the single filaments of the nylon yarn and by false twisting and twisting. The polyester yarn is tightly wound with the actual twist in the same direction as the false twisting direction, while the bulky converging part is made of nylon. Most of the single filaments of the yarn are not bonded and are twisted in the opposite direction to the tightly bundled portion, and the polyester yarn is gently twisted in the false twisting and untwisting direction on the outside with the yarn as a core. attached.

2. The lengths of the densely bundled part and bulky bundled part of 5 m of yarn were measured and the results were as follows.

Tightly bundled part...5 to 24 mm, average 27mm Bulky bundled part...8 to 90mm, average 42mm 3 Even if the processed yarn is subjected to tension-relaxation treatment with a load of 0.5 g/d, the difference between nylon and polyester
The threads were tightly bundled in the tightly bundled portion without separation.

4 0.1g/d to the obtained processed yarn (203 denier)
A load of 50 cm was applied, and the length between the marks was measured, and two yarns, a low melting point yarn (128 denier) and a high melting point yarn (75 denier), were separated at this length without causing plastic deformation. 0.1 for each
The length was measured by applying a load of g/d and the results were as follows.

Γ Low melting point yarn (nylon 100d/24f semi-dull yarn)
…50cm Γ high melting point yarn (polyester 75d/24f semi-dull yarn) …61.5cm When the processed yarn was made into a knitted fabric, a product with a fancy appearance, a silky taste, and a soft texture was obtained. It was done.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a portion of the composite false twisted yarn of the present invention. 1: Tightly bundled part, 3,3': Low melting point yarn, 2:
Bulky convergence part, 4, 4': high melting point yarn.

Claims (1)

[Claims] 1 A low melting point yarn in which some or all of the single filaments are fused and bundled is used as a core, and the high melting point yarn is placed outside the low melting point yarn in the same direction as the false twisting direction without being dispersed. A tightly bundled part formed by twisting tightly and a core of low melting point yarn in which single filaments are bundled with almost no fusion, and a high melting point yarn is formed outside the low melting point yarn without being dispersed. 1. A composite false-twisted processed yarn, characterized in that it has bulky converging parts which are loosely wound in the actual twisting direction in the false-twisting/untwisting direction and alternately in the longitudinal direction of the yarn.