JPH02293426A - Functional polyester blended yarn - Google Patents

Abstract

PURPOSE:To provide the subject blended yarn having excellent wear resistance, color-mixing effect, elasticity, soft hand, etc., and suitable for inner wears, baby wears, etc., by blending plural filaments having different elasticities with each other. CONSTITUTION:Polyester undrawn filaments 1 and undrawn filaments 2 preferably having elongation degrees >=50% lower than those of the polyester undrawn filaments 1 are paralleled to each other and fed from drawing rollers 3 to a false-twisting region. The yarn 4 thus paralleled is interlaced with an air nozzle 5 and subsequently twisted through a false-twisting tool 8 wherein the undrawn filaments 1 are preferably filaments having a [eta]p of 0.7-1.1; either one of the undrawn filaments 1 and 2 are cation dye-dyeable filaments; or the undrawn filaments are elastic filaments. The false-twisting temperature is preferably <=120 deg.C, and the false-twisted filaments are fed into a heater 10 preferably heated at >=120 deg.C in an over-feeding degree such as -5-+10% and subsequently wound up on a taking roller 11 to provide the objective blended yarn.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a functional polyester blend yarn, more specifically, a field that requires a soft texture and (a) abrasion resistance and high strength. , (b) A functional polyester blend yarn suitable for use in fields requiring a color mix effect (heather effect), or (C) fields requiring stretchability.

[Prior art and its problems] Polyester is a primarily crystalline polymer, and during its fiberization process, it is sufficiently heat-treated and crystallized to produce hard and strong fibers. In response to this, the present inventors previously proposed in Japanese Patent Application No. 62-279364 a method for producing polyester fibers having extremely soft texture characteristics that are completely different from conventional polyesters. In this method, two or more types of synthetic fiber yarns having different drawability are false-twisted in an aligned spool, set during false-twisting, and then untwisted, under the set conditions. The yarn is false-twisted at room temperature or at most 120°C, and the resulting yarn is heat-treated at a temperature of 130°C or higher in the subsequent process.

Surprisingly, when the yarn obtained by the above method is made into a textile, the characteristic hardness of conventional polyester disappears, and in addition to fibrillation resistance and easy dyeing, it has an extremely soft texture and a more concrete texture. In general, it has a soft touch like marshmallow or cherry paper, and is suitable for innerwear such as lingerie and baby clothing that come in direct contact with the skin.

However, on the other hand, while making full use of the soft texture that is the most important feature of the above-mentioned yarns (i.e., mixed fiber yarns), it is possible to create mixed fiber yarns that do not add certain functionality. There are also strong demands.

[Technical Problem] The object of the present invention is to maintain the soft texture that is characteristic of the mixed filament yarn according to the above proposal, and to improve (a) abrasion resistance, fibril resistance, and easy dyeability. An object of the present invention is to provide a functional polyester blend yarn that has (b) a color mix (heather) effect, or (c) has elasticity.

[Technical Means] According to the present invention, there is provided a mixed yarn consisting of two or more types of polyester multifilament yarns having mutually different elongations, in which case (A) as the filament yarn on the high elongation side, [ η] A yarn whose F is 0.7 to 1.1 is disposed, or (B) a basic dye dyeable yarn is disposed as a filament yarn on the high elongation side or low elongation side, Alternatively, (C) there is provided a functional polyester mixed yarn characterized in that a yarn having stretchability is arranged as a filament yarn on the low elongation side.

The present invention will be explained in detail below.

The thread processing method for obtaining flexible polyester filaments, which is the basic concept of the present invention, involves aligning two or more types of filament threads with different drawability and heating them at 120°C.
below, preferably below 105°C, more preferably below 80°C
The purpose is to false twist the yarn at temperatures ranging from below °C to room temperature, and then heat treat it to reduce the shrinkage rate of the yarn in boiling water and ensure its ease of handling. False twisting is carried out by using a single yarn with a higher elongation, at a stretching ratio of less than 120°C (near the crystallization start temperature), especially,
When drawing at a temperature lower than the glass transition point (approximately 80°C), drawing in the yarn axis direction results in spotty drawing, resulting in thick and thin yarns in places, causing dark and light streaks in the fabric. They discovered that when a thread with a small elongation is attached and twisted together and stretched while being twisted, the material can be stretched uniformly.

The present invention utilizes this basic idea and has succeeded in maintaining the soft texture of the mixed filament yarn obtained by the above method while also adding a certain functionality.

The present invention will be explained below with reference to the accompanying drawings.

悌→The figure is an example of the process for obtaining the mixed fiber yarn of the present invention, and the polyester undrawn yarn 1 has an elongation of 50%.
The undrawn yarns 2 (hereinafter referred to as plating yarns) are aligned with the undrawn yarns 2 (hereinafter referred to as plating yarns) and are supplied from the supply rollers 3 to the false twisting processing area. After the aligned yarns 4 are intertwined with each other by an air nozzle 5, they are sent through an intermediate roller 6 to a false twister 8, where they are twisted.

As a result, in front (upstream) of the false twister 8, the undrawn filament 1 is stretched by wrapping around the plating thread 2. In this case, the de ratio of undrawn yarns 1 and 2 is usually 20
: 80 to 80 : It is sufficient if it is in the range of 20.

However, in the case of (person) and (C) above, the high [η] yarn or the yarn having elasticity is 35 to 70 weight 1 in the mixed fiber yarn.
%.

In order to macroscopically control the stretching of yarns with high elongation, the false twisting temperature needs to be low enough to prevent the molecular chains from moving around freely, and even when the heating time is 1 second or less, the It is important that the temperature is below C, preferably the glass transition point
The temperature is preferably below 80'C, particularly preferably at room temperature.

Next, the false-untwisted yarn is heated by the heater 10. At that time, it may be heated at 120°C or higher, preferably 160°C or higher, for 0.1 seconds or longer. Further, as the heater, either a contact type hot plate heater or a non-contact type heater can be used. It is appropriate that the overfeed rate of the yarn to the heater 10 is -5 to -+10%, but in this case, the running performance of the yarn is the best under a constant length. The heat treatment under constant length heat shrinks part or all of the yarn length difference caused by twisting and elongating the yarn with high elongation by false twisting the yarn with low elongation, and eliminates it. This results in a so-called mixed fiber yarn with no difference in yarn length.

Next, this mixed yarn passes through a take-up roller (11) and reaches a winder (12).

By the way, in the above process, the mixed fiber yarn of the present invention is formed by (A+undrawn yarn 1, that is, as filament yarn on the high elongation side) [η
] p (intrinsic viscosity of the fiber) is 0.7 to 1.1, or (B) undrawn yarn 1 (high elongation filament yarn) or undrawn yarn 2 (low elongation side) Either a thread dyeable with a basic dye is used as the filament thread (on the side), or a thread having stretchability is used as the undrawn thread 2 (C). Cases (A), (B), and (C) will be described below.

(Case of Al: Fabrics using polyester yarns with high [η]F are used in various industrial material applications and in the fields of sports clothing and working wear that require strength. However, this fabric Although it has excellent abrasion resistance, it has a hard texture and poor fibril resistance (fluffy appearance) due to being made of fully drawn yarn with high [η]F.
It had the disadvantage that it had poor dyeability and did not produce deep colors.

In this regard, in the uninvention, the filament yarn on the high elongation side,
[η] Using polyester yarn with F of 0.7 to 1.1,
Since the mixed fiber yarn is obtained using the above-mentioned winding and drawing at low temperatures,
While maintaining abrasion resistance due to high [η]F, problems with texture, fibrillarity, and dyeability are solved.

Here, [η]F of the yarn on the high elongation side is preferably 0.7
It is 2 to 0.9. On the other hand, as the yarn on the low elongation side, it is possible to use ordinary clothing fibers with [η] of 0.5 or more and less than 0.7, as well as those with [η] of 0.72 to 0.9. Furthermore, the basic dye-dyeable yarn can also be arranged as a part of the yarn, and in the case of such a yarn, the heather effect can be obtained even if it is used as both high elongation yarn and low elongation yarn. is obtained.

Note that [η]F is a value measured at a temperature of 20° C. using a mixed solvent of equal weights of phenol and tetrachloroethane.

Case <B): Heather-like materials are essential for clothing materials. Here, in order to express the heather effect, a basic dye dyeable polyester (typically, 3,5-dicarbomethoxybenzenesulfonic acid sodium is added to a part of the material at a ratio of 0.5 to terephthalic acid) It is well known that polyester copolymerized with about 5 mol% is used.However, drapability and softness are also important factors for clothing materials.
For this reason, when alkali weight loss is applied, there is a drawback that a significant decrease in strength occurs.

In this regard, in the present invention, a thread dyeable with a basic dye is arranged in either undrawn yarn 1 or 2, and a mixed fiber yarn is obtained using the above-mentioned winding and drawing at low temperatures. Even without weight loss,
A heather-like mixed yarn having a soft feel and drape feeling comparable to that can be obtained.

Case (C): Conventional stretch m products have used Sorin, which is made of conjugate yarn or spandex as a core yarn and covered with processed yarn.

However, in this case, the stretchable wound yarn is present in the woven fabric in a contracted state, and the woven fabric is compact, so there is a drawback that the texture is hard and stiff.

In this regard, in the present invention, since the mixed yarn is obtained using the above-mentioned winding and drawing at low temperature, the soft feeling is maintained and stretchability is obtained due to the yarn having elasticity on the low elongation side.

Here, the yarn having elasticity is polyester elastomer fiber, polybutylene terephthalate fiber shown in Japanese Patent Publication No. 61-36107, polybutylene terephthalate fiber shown in Japanese Patent Publication No. 62-49376, and Japanese Patent Publication No. 63-54806. , polybutylene terephthalate/polyethylene terephthalate conjugate fibers are used.

[Effects of the Invention] According to the present invention, a soft texture can be maintained, abrasion resistance can coexist with a soft texture, a soft feeling can be achieved even without alkali weight reduction, drapability can be imparted and a heather effect can coexist, and flexibility can be achieved. This method has great industrial significance in that a polyester blend yarn with a coexistence of soft texture and elasticity and outstanding functionality can be obtained, and new uses for polyester fibers can be found.

Example 1 Melt-spun at a spinning speed of 1000 m/min, elongation at break 250%, glass transition point 80°C, fineness 204 denier,
Polyester undrawn yarn with 24 filaments [77]
F = 0.72, undrawn polyester yarn [η], = 0.72, melt-spun at a spinning speed of 2500 m/min, elongation at break 125%, glass transition point 80°C, fineness 140 denier, number of filaments 24. The filaments were arranged and subjected to an air entangling nozzle at an overfeed rate of 2.0% and a compressed air pressure of 5.0 kg/m to entangle the filaments with each other at a number of entanglements of 89 filaments/m.

Next, this intertwined yarn was passed through a triaxial friction false twisting device rotating at a surface speed of 800 m/miΩ at a speed of 400 m/min and a draw ratio of 1.55 times to undergo false twisting at a heater temperature of 28°C. Shina. Further, this was passed through a heater at 210° C. for 0.4 seconds at a constant length to obtain a yarn of 230 denier/48 filaments, 62 entanglements/m, and a boiling water shrinkage rate of 7%.

Using this processed yarn, twist 300 times/m, weave with twill structure, relax (80℃ x 25 minutes), preset (170℃ x 40 seconds), dyeing temperature (120℃ x 45 minutes) , finishing process (160°C x 45 seconds). The obtained fabric has a density of 30 fibers/c in the warp direction.
m, 27 lines/am in the latitudinal direction, and a basis weight of 155 g/rTi'.
It is soft with a bending hardness of 2.1g and exhibits high resilience with a bending repulsion rate of 94%.

The abrasion test was grade 5, with no problems at all, and no occurrence of fibbers was observed. Furthermore, the dyed cloth had a sufficiently deep color even though it had a high [η].

For reference, each physical property of the mixed yarn is shown in Table 1.

In Table 1, the abrasion strength is determined using #60 abrasive paper according to the method shown in JIS L 1096 A-3 method (fold method).
Measured using 0.

Example 2 Cutting elongation 3 melt-spun at a spinning speed of 1100 m/min
00%, glass transition point 80°C, fineness 150 denier, basic dye dyeable polyester undrawn yarn with 48 filaments, melt spun at a spinning speed of 3200 m/min, cutting elongation 130%, glass transition point 80°C , a polyester undrawn yarn with a fineness of 115 denier and 15 filaments, and the overfeet rate was 1.5%, and the air entanglement nozzle was subjected to a compressed air pressure of 4kglcx&, resulting in a number of entanglements of 95.
The filaments were intertwined with each other at 2/m.

Next, this entangled yarn was passed through a triaxial friction false twisting device rotating at a surface speed of 700 m/min at a speed of 350 m/min and a draw ratio of 1.5 times, and heated at a heater temperature of 30°C.
It was false-twisted at 17. Furthermore, this was passed through a 180°C heater for 0.4 seconds at a fixed length to give a temperature of 177 denier/763.
Filament, number of entangled pieces/m, boiling water shrinkage rate 5.8%
A yarn was obtained.

Using this processed yarn, twist the yarn at 150 times/m, and after weaving with the core tissue, relax (80°C x 25 minutes), preset (170°C x 40 seconds), and dye temperature (120°C x 45 minutes).
It was finished through the process of finishing (160°C x 45 seconds). The density is 35 lines/cm in the longitudinal direction, 32 lines/cm in the latitudinal direction, 153 g/rr1', the bending hardness is 1.8 g, it is soft without alkali weight loss, and the bending repulsion rate is 8.
To obtain a color mixed fabric exhibiting high resilience of 9%.

For reference, each physical property of the mixed yarn is shown in Table 2.

Table 2 In addition, the flexibility of the fabric was evaluated by bending hardness (BS), and the resilience of the fabric was evaluated by bending resilience (BR). The measurement method is JIS L 1096 6. 20. The 3C method (bending loop compression method) was used.

Example 3 Cutting elongation 2 melt-spun at a spinning speed of 1300 m/min
80%, glass transition point 80°C, fineness 150 denier,
Undrawn polyester yarn with 24 filaments and a cutting elongation of 130 melt-spun at a spinning speed of 2800 m/min.
%, fineness 150 denier, 30 filaments of polyethylene terephthalate/polybutylene terephthalate conjugate yarn [joining ratio (weight): 50:50], overfeed rate 1.5%, air pressure 4 The filaments were subjected to an air entangling nozzle at a rate of .5 kg/1, and the filaments were entangled with each other at a rate of 92 entanglements/m.

Next, this intertwined yarn was passed through a triaxial friction false twister 1 rotating at a surface speed of 7QQm/min at a speed of 350m/min and a draw ratio of 1.5 times, and heated at a heater temperature of 28°C.
It was false twisted. Further, this was passed through a heater at 190° C. for 0.3 seconds at a constant length to obtain a yarn of 192 denier/78 filaments, number of entanglements 72/m, and boiling water shrinkage rate of 5.3%.

Using this processed yarn, twist 300 times/m, weave with twill structure, relax (80℃ x 25 minutes), preset (170℃ x 40 seconds), dyeing temperature (120℃ x 45 minutes)
, finishing process (160°C x 45 seconds). The obtained fabric had a density of 33 fibers/cm in the warp direction,
Latitude direction 25 lines/am, basis weight 239g/rr? It was soft with a bending hardness of 1.9g and exhibited high resilience with a bending rebound rate of 87%. Moreover, the stretch rate was 21%.

For reference, each physical property of the mixed yarn is shown in Table 3.

Table 3

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the process of obtaining a mixed fiber yarn of the present invention. 1...Undrawn yarn with high elongation 2}...Undrawn yarn with low elongation 3)...supply roller ４　・・・Arranging yarn 5}...Air nozzle 6...Intermediate roller 7)...False twist heater 8)...False twisting tool 9...Take-up roller 10}...Secondary heat treatment heater 11)...Take-up roller 12}... Winder

Claims (1)

[Claims] (1) A blended yarn consisting of two or more types of polyester multifilament yarns having different elongations, in which case (A) as the filament yarn on the high elongation side, [η]_F
0.7 to 1.1, (B) a basic dye dyeable yarn is used as the filament yarn on the high elongation side or the low elongation side, or (C ) A functional polyester blend yarn characterized in that a yarn having stretchability is arranged as a filament yarn on the low elongation side.