JPH01292127A - Manufacturing method of silk-like false twisted yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a texture and appearance (hereinafter referred to as "stretched yarn") which is not subjected to false twisting even though it is a false-twisted yarn. This invention relates to a method for producing a bulky structured yarn mainly composed of polyester fibers, which has a texture (such a state is called a drawn yarn-like state) and whose texture is hardly changed by the dyeing process or heat finishing such as heating. The structured yarn obtained by the method of the present invention is mainly used in the field of feminine silk-like clothing.

<Prior art and problems to be solved by the invention> As a method for producing bulky structured yarn, a method of plucking and false twisting a plurality of fiber yarns is known, and the false twisting temperature is usually 180 to 230°C. And it is common to false twist with the normal number of twists. Using this method, it is possible to create different textures depending on the yarns combined and the false twisting conditions, but almost all of them are linen-like textured yarns that utilize glue, or wool-like textures with large crimped bulk. It is a yarn, has bulkiness and looks like a drawn yarn, and it is difficult to obtain a textured yarn with a mesh structure.

Some of the inventors of the present invention have conducted research on a method for manufacturing yarn with a bulky, drawn yarn-like, interwoven structure, and have already filed the results of this research in Japanese Patent Application No. 116269/1983. . The method of the filed invention involves entangling a plurality of yarns including two polyester fiber yarns having a difference in elongation at break of 50% or more, and then false twisting with a low number of false twists under low temperature conditions. This is what we do. The structured yarn obtained by this method has the above-mentioned properties, but on the other hand, it has the disadvantage that the texture tends to change when it is placed at a temperature higher than the false-twisting temperature when it is made into a woven or knitted fabric. ing.

This tendency is particularly noticeable when the false twisting temperature is 120° C. or lower.

<Means for Solving the Problems> The present inventors have developed a structured yarn that is like a drawn yarn and has bulkiness, and that can be processed by heating finishing treatments such as preheating, dyeing process, and final heating. As a result of studies aimed at obtaining a structured yarn that does not change its texture, it has been found that the textured yarn obtained in the invention of Japanese Patent Application No. 116269/1980 has the same or higher false twisting conditions. It has been found that the above object can be achieved by performing reheat treatment at a temperature of . That is, the present invention provides 50%
After piling and entangling a plurality of yarns including two polyester fiber yarns having the above-described difference in breaking elongation, the false twisting temperature is set to 150° C. or above, which is the glass transition point of the fibers.
By setting the temperature within the range below ℃ to avoid sticking, and by performing low false twisting where the false twist number satisfies the following formula, and by reheating at a temperature higher than the false twisting temperature, the crimp property is improved. (L≦5%) to make it look like a drawn yarn, and the texture hardly changes after the subsequent heat finishing treatment.

Tw <CTWxO, 85Tv: Number of false twists Dr=
Fineness after stretching (denier) Here, 1 means that after winding up the sample with a total winder until a denier of 500 (d) is obtained, a load of 10 g is suspended at the center of the lower edge of the green, and the upper center is Fix this total and 0.001g
A hot water treatment is performed at 90° C. for 30 minutes under a load of /d. Then, after drying by leaving at room temperature without any load, a load of 10 g was applied again and the yarn length after being left for 5 minutes was measured, and this was defined as L+(am). Next 1.1kg
The yarn length was measured after applying a load of
s). X is determined by the following formula.

K, (%) = ((L, -tz)/l, *) xlo
.

This L value indicates the amount of shrinkage due to the crimpability of the yarn, and the length when a large load is applied is the length when no crimp is applied, and the length when a very small load (equivalent to no load) is applied. This shows the difference in length.

While the Kl value of ordinary bulky structured yarn (wool-like textured yarn is 7 to 20%), the Kl value of the mesh-stretched yarn-like structured yarn obtained by the method of the present invention is 5% or less. It can be seen that the crimp is low, so it is like a drawn yarn with little crimp.

This processed yarn has a two-layer structure in which a part of a plurality of fiber yarns is used as a core yarn, and other yarns are wound around the core yarn. When this is used for post-processing, since there is little crimp, there are problems such as walnuts appearing in the wound yarn, changing the texture, curling up fluff due to sagging, and poor unwinding properties. In the present invention, the yarn is subjected to entanglement treatment before false twisting or stretching false twisting to give the yarn a number of entanglements of 25 entanglements/m or more, thereby improving the bundleability, process passability, and unwinding ability of the yarn. It is characterized by

Normally, the entanglement treatment is performed after false twisting or stretch false twisting, but in the present invention, instead of the entanglement treatment performed before false twisting or stretch false twisting, the entanglement treatment is performed after false twisting or stretch false twisting. When a combination treatment is performed, fuzz occurs frequently. Therefore, it is important to perform the entanglement treatment before performing false twisting or stretch false twisting.

The textured yarn of the present invention has a bulky structure that is like a drawn yarn between the meshes, and has two fiber bundles in which among a plurality of yarns, a fiber bundle with a small elongation at break becomes a core yarn and a fiber bundle with a high elongation at break becomes a wrapped yarn. It has a layered structure yarn. Therefore, in order to bring out even more characteristics when fabrics are made from these yarns, it is desirable that the single fineness of these fiber bundles satisfies the following formula.

Dr(1)≧1.3 Dr(1): Single density (denier) of yarn with low elongation after drawing Ko(2)≦1.3 Dr(2): Single density (denier) of yarn with high elongation after drawing Fineness (denier) Dr (1) > Dr (2) In other words, by increasing Dr (1) (core yarn),
It strengthens the elasticity of woven and knitted fabrics, and reduces Dr (2) (wrap thread) (
The soft feel of woven or knitted fabrics can be increased by increasing the count. More preferably Dr(1)≧2.0,
Dr(2)≦1.0.

The polyester fiber threads used in the method of the present invention include a combination of two fibers having a difference in elongation at break of 50% or more. If the difference in elongation at break is less than 50%, bulkiness cannot be obtained, and the desired drawn yarn-like false twisted yarn cannot be obtained. Of these two, the thread with the smallest elongation is the core thread.
The yarn with a high elongation becomes the side yarn, and the denier ratio of the yarn after being drawn, which becomes the core yarn, is preferably 30 to 70% by weight.

In the method of the present invention, the above-mentioned entanglement treatment (interlacing treatment) is performed on a yarn obtained by splicing two or more yarns together. In this case, the number of entanglements must be 25 or more per m, and if it is less than 25 per m, the yarn will be poor in terms of cohesion, process passability, and unwinding. In order to increase the number of entanglements, methods such as lowering the interlace processing speed, lowering the tension, and increasing the air pressure may be used.

The yarn thus entangled is then subjected to false twisting (including simultaneous stretching and false twisting and a process in which stretching and false twisting are carried out in conjunction). The false twist setting temperature at that time must be between 80 and 150°C as described above. When the false-twisting set temperature is less than 80° C., false-twisting properties become difficult, thermal stability in post-processing is poor, and bulkiness is also difficult to obtain. If the temperature exceeds 150°C, the yarn becomes textured yarn-like, and the special false twisted textured yarn that is the object of the present invention cannot be obtained. Particularly preferably, the temperature is in the range of 100 to 140°C. In addition, if the number of false twists during false twisting is important and exceeds the number, the yarn becomes textured yarn-like in this case as well, and the special false twisted textured yarn that is the object of the present invention cannot be obtained. More preferably, it is. The false twisting speed used is 100 to 250 rn/min. In addition, when the raw yarn used is an undrawn yarn or a semi-drawn yarn, stretching may be performed simultaneously with or prior to the false twisting (which may precede the entanglement treatment).

In the method of the present invention, the thus false twisted textured yarn is then subjected to a reheat treatment. The temperature of the reheat treatment must be above the false twisting temperature. If the reheat treatment temperature is lower than the false twisting temperature, the object of the present invention cannot be achieved. More preferably, the temperature is 145° C. or higher and higher than the false-twisting temperature. This reheating treatment is performed using devices such as heating plates, heating pins, heating rolls, and the like. If the temperature of this reheating treatment is too high, the false twist that has been applied will disappear, so it is preferable to keep the temperature at 180° C. or lower.

The polyester fiber used in the method of the present invention is a fiber made of a polymer mainly composed of ethylene terephthalate units, and of course a small amount of other components (such as isophthalic acid and sulfoisophthalic acid) are copolymerized for modification. Alternatively, other polymers and additive components may be mixed.

The present invention will be further explained below with reference to Examples.

Example 1 A cotton-like drawn yarn-like bulky structured yarn was produced under the following conditions.

Yarn with low elongation (core yarn)...polyester filament 50d/36f, elongation at break 144 Single fibreness: 1.39 Yarn with high elongation (wound yarn)...polyester filament 30d/48f, elongation at break 247 Single fiber size 0.63 ・Entanglement treatment: interlace ・Number of entanglements: 68 pieces/Il ・Twisting set temperature = 120℃ ・Reheat treatment temperature: 150℃ ・Number of twists: 2200T/m (CTw: Normal number of false twists 80%) The Kl (described above) of the yarn obtained under such raw yarn and false twisting conditions was 2.0. The texture of the woven or knitted fabric did not change during the post-process, and a soft, drawn yarn-like, fluffy processed yarn was obtained.

Example 2, Comparative Examples 1 to 4 Using the above-mentioned raw yarn, the entanglement treatment was performed in the same manner as in Example 1 to obtain a textured yarn with a bulky structure similar to an interwoven stretched yarn.

Table 1 shows the false twisting conditions, physical properties, and texture. Table 1 also shows the results of Example 1.

In the yarn obtained in Margin 22 below, the twist setting temperature is 120℃
No sticking was observed at temperatures above 150°C, but it was observed when the temperature exceeded 150°C. When the twist setting temperature was 120° C. and the number of twists was 80% of CTw (normal number of twists), a soft and fluffy textured yarn similar to drawn yarn was produced. In contrast, in the case of 95% of CTw,
A soft and fluffy textured yarn was created, but it is inferior in its most distinctive feature, the drawn yarn-like appearance. Twisting set temperature is 120℃
, the number of twists is 80% of CT thong, and the crimp set temperature is 15
When the temperature was 0°C, the texture did not change during post-processing (post-processing unchanged), but when the reheat treatment temperature was 50°C, the texture changed during post-processing, and the soft feel and bulkiness was slightly inferior.

Patent applicant RiRashi Co., Ltd. Representative Patent Attorney Ken Honda

Claims (1)

[Claims] 1. A plurality of yarns including two polyester fiber yarns having a difference in elongation at break of 50% or more are combined and subjected to false twisting or stretching (simultaneous or continuous). In this case, before performing false twisting or stretching false twisting, the spliced yarn is subjected to an entanglement treatment to reduce the number of entanglements to 2.
5 entanglements/m or more, then false twisting is performed at a low temperature twisting temperature in the range of 80 to 150°C and a low number of false twists that satisfies the following formula, and then at the low temperature twisting temperature. A method for producing silk-like bulky false-twisted yarn, characterized by performing reheat treatment at a temperature above. Tw≦(25500/√(Dr)+400)×0.85 Tw: Number of false twists Dr: Fineness of yarn after drawing (denier)