JP2770418B2 - Latent bulky polyester composite yarn for strong twist - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention is a composite yarn for a strongly twisted knitted fabric which is soft, flexible, and capable of preventing inflammation, and has excellent crimp standing and crimp as seen in silk. The present invention relates to a poly-ester composite yarn for strong twist that expresses and binds quality.

(Prior Art) Conventionally, there are many known methods for producing a raw yarn for strong twist using synthetic fibers. When manufacturing a strongly twisted knit, it is necessary to facilitate handling in a weaving knitting preparation step, a weaving knitting step, and the like after temporarily fixing the twist of the strongly twisted yarn. This is due to the occurrence of twisting due to the strong twisting yarn. Therefore, it is necessary to twist and fix the strongly twisted yarn after the high twisting with high temperature heat. However, the temporary twist fixing treatment at a high temperature itself results in thermal deformation of the synthetic fiber yarn, and thus it was not possible to obtain a textured knitted fabric of satisfactory quality.

From such a point, Japanese Patent Publication No. 51-23619 discloses a specific gravity of 1.3 as a technique for improving grain standing property and grain quality.
A method of subjecting polyethylene terephthalate filaments having a size of 90 or more to strong twisting after applying a paste and then performing a wet heat treatment at 60 to 90 ° C. Japanese Patent Application Laid-Open No. 53-106840 discloses a polyester filament yarn for strongly twisted warp knitting. As a method of producing the compound, the shrinkage ratio of boiling water is 0 to 5% and the heat shrinkage stress at 140 ° C.
1 for heat shrinkage stress of 3g / d or more and dry heat of 140 ° C
There is disclosed a method in which a polyester filament having a heat shrinkage stress ratio at 80 ° C. of 1.0 or more is strongly twisted, and then a twisting set is performed with steam at 70 to 130 ° C. Japanese Patent Publication No. 63-48971 discloses a polyester-based composition in which the temperature at which the dry heat shrinkage stress is maximum is 180 ° C. or more and less than the melting point, and the dry heat shrinkage stress at the peak temperature is 0.03 g / d or less. Fiber, heat-sensitive low-yarn strong twist yarn is shown.

As described above, the use of a low-yield raw yarn for strong twisting improves the crimping property and the grain quality, but in the case of a strong twisting yarn, the woven and knitted fabric is formed due to the convergence of the yarn by twisting. In particular, thin, strong twisted woven fabrics such as georgette were highly skewed, necessitating a lining or having limited use.

(Problems to be Solved by the Invention) An object of the present invention is to remedy the above-mentioned drawbacks of the prior art, and it is extremely easy to handle it in a strong twist state, and when it is formed into a woven or knitted fabric, It is an object of the present invention to provide a latently bulky polyester composite yarn for strong twist, which has good standing properties and texture, and can improve scalability.

(Means for Solving the Problems) The present invention has the following configuration to solve the problems. That is, it is a composite yarn composed of multifilament yarn A and multifilament yarn B whose yarn properties satisfy the following range and has an average boiling water shrinkage of 100 ° C. of 10% or less. A latently bulky polyester composite yarn for strong twist, characterized by being entangled.

Multifilament yarn A: Multifilament yarn having a single denier of 3 denier or less (a content of 20 to 80 in the composite yarn)
% [Denier ratio]) Multifilament yarn B: breaking strength is 4 g / d or more, breaking elongation is 20 to 40%, and peak temperature of dry heat shrinkage stress is 130 ° C.
Above, the dry heat shrinkage stress at the peak temperature is 0.35 g /
Multifilament yarn of d or less (content in composite yarn: 80 to 20% [denier ratio]) SHD (A) ≦ 0% SHW (A) ≧ 0% SHW (B) ≧ 0% SHD (B) − SHD (A) ≧ 5% SHW: Shrinkage rate of boiling water (100 ° C.) SHD: Shrinkage rate of dry heat (160 ° C.) Hereinafter, the present invention will be described in more detail.

FIG. 1 is a model diagram after a polyester composite yarn of the present invention is subjected to a heat treatment to develop a yarn length difference. In FIG. 1, A is a multifilament mainly constituting a sheath portion, which is substantially elongated by high-temperature heat treatment (multifilament after spontaneous stretching). B is a multifilament constituting the core, which is a multifilament shrunk by heat treatment (multifilament after heat shrinkage).

FIG. 2 is a model diagram of the cross section of the polyester composite yarn of the present invention after strong twisting and heat treatment to develop a yarn length difference. As in FIG. 1, A in FIG. 2 is a multifilament mainly constituting a sheath portion, which is a multifilament after spontaneous elongation. B is a multifilament constituting the core, which is a multifilament after heat shrinkage.

First, the heat shrinkage characteristic of the constituent multifilament yarn, which is the most important requirement in the present invention, will be described. Multifilament yarn B constituting polyester composite yarn of the present invention
Has good shrinkage ratio of 10
% Or less, the peak temperature of the dry heat shrinkage stress must be 130 ° C. or more, and the dry heat shrinkage stress at the peak temperature must be 0.35 g / d or less. It is indispensable to use a core constituting yarn.
However, as described later, by using the core-sheath composite yarn of the present invention,
There is no need to use an extremely low heat-sensitive yarn as disclosed in JP-B-63-48971. It is indispensable to have the above-mentioned heat shrinkage characteristics depending on the weaving knitting preparation step, the passability of the weaving knitting step, the crimping property, and the texture. The boiling water shrinkage must be 10% or less in order to eliminate hardening of the strong twisted yarn at the time of twist setting after strong twisting, and to eliminate set unevenness in the inner and outer layers of cheese. The dry heat shrinkage stress characteristic is such that the peak temperature of the dry heat shrinkage stress is 130 ° C. or more and the melting point or less, and the dry heat shrinkage stress at this peak temperature is 0.35
It must be less than g / d. More preferably, the peak temperature of the dry heat shrinkage stress is 150 ° C. or higher and the melting point or lower, and
The dry heat shrinkage stress at the peak temperature is desirably 0.2 g / d or less.

The multifilament A, which mainly constitutes the sheath of the composite yarn of the present invention, exhibits a small shrinkage difference from the multifilament B in the twisting heat set after strong twisting, and substantially exhibits shrinkage behavior. For this reason, even when the same yarn length difference is expressed in the fabric, the yarn length difference (bulge, loop, etc.) does not appear so much even if the twist setting is performed at the yarn stage, and the handling property and the weaving knitting property during weaving are reduced. It will be good. Twisting heat set is wet heat 60 ~
90 ° C is preferred, and at 90 ° C or higher, multifilament yarn A
Are spontaneously elongated, and a difference in yarn length is observed, which is not preferable.

In addition, normal heat shrinkable multifilament is twist set,
When subjected to heat treatment by dyeing, etc., the heat set is almost fixed, and even if subjected to high temperature heat treatment of about 160 to 180 ° C in the final set, the yarn length difference does not appear much more than at the time of the first heat setting, but the composite of the present invention By including multifilaments that shrink in hot water but elongate by high-temperature heat treatment corresponding to the final set, such as yarn, the multifilaments A project in a loop shape by finishing at a higher temperature than the shrinked cloth surface as a whole, You get a soft, flexible touch as if it were a peach surface. For this purpose, SHW (A) ≧ 0% and SHD (A) ≦ 0% are essential.
SHD (B) -SHD for more swelling and bulkiness
(A) ≧ 5% is required, and if it is less than 5%, it swells and the bulkiness is inferior, so it is excluded from the present invention. However, if it is too large, the loop protruding from the surface becomes too large, and problems such as "tekari" tend to occur when ironing or the like. For the same reason, SHW (A) is 5% or less, SHD
(A) is preferably -15% or more.

Next, the elongation at break of the multifilament yarn A is 50% to 100%.
%, More preferably 50 to 80%.

In general, in order to obtain a soft feeling with polyester, it is easier to obtain a filament having a smaller SHW and a larger elongation at break. This is because spontaneously elongated multifilaments cover the surface of the fabric in a loop as described in detail above, and the touch of the multifilament determines the touch of the fabric. However, if the elongation at break is too large, the handleability deteriorates.

Next, the elongation at break of the multifilament yarn B is essential to be 20 to 40%, so that yarn spots do not occur due to the elongation of the composite yarn in the subsequent steps such as twisting, rewinding, weaving and knitting. Further, it is to prevent a problem such as a knee drop in the product after the fabric is formed. Since the breaking strength of the composite filament also depends substantially on the heat-shrinkable multifilament, the breaking strength of the heat-shrinkable multifilament must be at least 4 g / denier and at least 20% in terms of the denier ratio of the composite filament. Of course, if the breaking strength is high, the ratio of the multifilament B may be slightly lower. However, if it is less than 20%, the shrinking force of the multifilament B becomes small, and the crimp standing property is reduced, resulting in poor cloth quality.

Next, the multifilament A must have a denier of 3 denier or less. If it exceeds 3 denier, the elongation at break is large, and even if the Young's modulus is low, the hand becomes coarse and hard, so it is excluded from the present invention. However, if the thickness is too small, the filament may have an irregular cross-section as described later, and the rigidity is reduced.
However, a mixture of 3 denier or more may be mixed (denier mix), and it is sufficient if the average is 3 denier or less.

The filament cross section may be either a round cross section or an irregular cross section. If the cloth is to be soft and dry touch, a polygonal cross section such as a triangular cross section or a multi-leaf cross section such as a trilobal cross section is preferable, and the bending elasticity of the cloth is increased. To make the filament yarn B
Is preferably a hollow section with a hollow ratio of 5 to 30%, and a flat section to reduce bending elasticity.

The polyester composite thread of the present invention has an entangling degree of 20 to 100
It is essential that the multifilament yarns are entangled with each other. If the entanglement degree is less than 20, the multifilament yarns are easily separated from each other, which significantly impairs the processability. Conversely, if the degree of confounding exceeds 100, interlace mark spots are conspicuous in the fabric, and the multifilament yarn A causes a single yarn break, resulting in feathers,
Further, a loop is generated, which is not preferable.

Further, the polyester referred to in the polyester composite yarn of the present invention is polyethylene terephthalate having substantially only ethylene terephthalate as a repeating unit, a copolymer of ethylene terephthalate and ethylene isophthalate, and the like, and if necessary, 5-metal sulfoisophthalic acid. , Polyethylene terephthalate containing a matting agent such as titanium oxide and other fine powder inert substances.

The number of twists of the strong twist yarn is Range is preferred, more preferably Within the range, the effect of the composite yarn of the present invention is observed in the potato.

To obtain the polyester composite yarn of the present invention, a spinning speed of 2000
Unstretched polyester spun at ~ 4000m / min at stretching temperature T
g-Tg + 20 ° C and stretched in the range of DE 25-45%, Δn 0.10-0.14 after stretching, then relaxed heat treatment with non-contact heater, spontaneously extensible polyester multifilament yarn A and heat shrinkable polyester multifilament Yarn B is obtained by blending yarns B at a confounding degree of 20 to 100 co / m so that the denier ratio is 20 to 80% / 80 to 20%. At this time, an air pressure of ^{2 to} 10 kg / cm ² G and an overfeed of 0 to 0.8% are appropriate. In order to impart spontaneous elongation, the above-mentioned relaxation heat treatment is performed. In this case, the overfeed and the temperature may be appropriately selected depending on the required elongation, but the overfeed is 20 to 60% and the temperature is 150 to 150. Two
About 30 ° C. is preferable.

EXAMPLES Hereinafter, the structure, operation, and effects of the present invention will be described with reference to examples, but the present invention is not limited to the following examples.

(Example) The measuring method implemented in the present invention is as follows.

1) Elongation at break In accordance with JIS-L-1013 (1981), the SS curve was measured at a sample length (gauge length) of 200 mm and a tensile speed of 200 mm / min using Tensilon manufactured by Toyo Baldwin, and the elongation at break was measured. Calculated.

2) Heat shrinkage (SHW), dry heat shrinkage (SHD) According to JIS-L-1073, the following was conducted. That is, a wrap reel having an initial load of 1/10 g / denier is taken on a wrap reel having an appropriate frame circumference, and an eight-turn wrap is taken. A load of 1/30 g / denier is applied to the wrap and its length l _0.
Measure (mm). Then remove the load, 1/1000
The scalpel is immersed in boiling water for 30 minutes under a load of g / denier. After that, remove the scalpel from the boiling water, cool it, apply a load of 1/30 g / denier again, and apply the length l ₁ (m
m). Then after drying at 60 ° C for 30 minutes, 1 / 1000g /
A heat treatment is performed in a drying oven at 160 ° C. under a load of denier. Then, after cooling, a load of 1/30 g / denier is applied again and the length l ₂ (mm) at that time is measured. The hot water shrinkage (SHW) and the dry heat shrinkage (SHD) are calculated by the following equations.

3) Degree of confounding Take out a yarn of an appropriate length and suspend it vertically by applying a load of 1 / 10g / denier to the lower end. Then, an appropriate needle is pulled out of the yarn, and a distance l (cm) of slowly lifting and moving until the load is lifted is measured 100 times, and an average value l (cm) is calculated from the following formula.

4) Dry heat shrinkage stress Using a Kanebo Engineering thermal stress measuring instrument,
The test length was 5 cm, the initial load was 0.03 g / d, and the temperature was raised from room temperature to fusing at a temperature rise rate of 100 ° C / min.The thermal stress was measured. The peak temperature and peak stress are defined as the dry heat shrinkage stress at the peak temperature,
g / d display.

Example 1 As a heat-extended multifilament, ordinary polyethylene terephthalate was spun and wound at a spinning speed of 3000 m / min by an ordinary method to obtain an undrawn yarn of 32 denier and 24 filaments having a triangular cross section. This undrawn yarn is subjected to drawing relaxation heat treatment using the apparatus shown in FIG. 3, and SHW (B) = 3% SHD (B) =
5%, dry heat shrinkage stress peak temperature 200 ° C, dry heat shrinkage stress at the peak temperature 0.2 g / d, heat-shrinkable polyester multifilament yarn of 50 denier 36 filaments, and composite yarn is formed. I wound it up. At this time, the stretching conditions were set as a heat-extending multifilament at a stretching ratio of 1.6, a stretching temperature of 82 ° C, and as relaxing conditions, a relaxation rate of 45%, a relaxing temperature of 190 ° C (non-contact heater length of 50 cm) and a delivery speed of 500 m / min. SH with denier 24 filament
W (A) = 0.5% SHD (A) = 4.0%, DE80%.
In addition, for the fiber mixture, an air jet FG-1 manufactured by Fiber Guide was used as an air nozzle, and the feed ratio between the feed roller 6 and the delivery roller 8 and the air pressure of the air nozzle were adjusted. And

The composite yarn of 79 denier 60 filaments obtained above is subjected to strong twisting of S and Z with a twist number of 2500 T / m, and the twist is temporarily fixed at 70 ° C. moist heat.
After weaving the georgette using a weft thread, the surface is embossed using a high-pressure rotary washer, and after 15% alkali weight reduction, dyeing and finishing heat setting are performed in the usual way. A 105 / in finished cloth was used.

The yarn using the potentially bulky polyester composite yarn for strong twist of the present invention exhibits good passability in the preparation and preparation process of the fiber, and has not only a textured property and a textured texture than the conventional one, but also a fabric. The surface touch was very soft, the texture was excellent, and there was almost no invisibility, and a very good textured fabric was obtained.

(Effect of the Invention) As described above, the polyester composite yarn of the present invention provides a soft and soft surface touch compared to the conventional high-twisted raw yarn, and provides a fiber fabric having excellent crimp standing and texture.

[Brief description of the drawings]

FIG. 1 is a model diagram in which a polyester composite yarn of the present invention is heat-treated at 160 ° C. to develop a yarn length difference. FIG. 2 is a model diagram of a cross section of a strongly twisted yarn in which the polyester composite yarn of the present invention is subjected to a heat treatment at 160 ° C. after strong twisting to develop a yarn length difference. FIG. 3 is a schematic side view showing an example of the manufacturing apparatus. A: Heat stretched multifilament B: Heat shrinkable multifilament C: Polyester composite yarn of the present invention 3: Hot roller 5: Non-contact heater 7: Air jet nozzle

Claims (1)

(57) [Claims] 1. A composite yarn comprising a multifilament yarn A and a multifilament yarn B having a physical property satisfying the following range and having a shrinkage of 100 ° C. boiling water of 10% or less. A potentially bulky polyester composite yarn for strong twist, characterized by being entangled with m. Multifilament yarn A: Multifilament yarn having a single denier of 3 denier or less (the content in the composite yarn is 20 to 80%
[Denier ratio]), multifilament yarn B: the breaking strength is 4 g / d or more, the breaking elongation is 20 to 40%, and the peak temperature of dry heat shrinkage stress is 130 ° C or more. 0.35g / d heat shrinkage stress
The following multifilament yarn (content in composite yarn)
80-20% [denier ratio]) SHD (A) ≦ 0% SHW (A) ≧ 0% SHW (B) ≧ 0% SHD (B) −SHD (A) ≧ 5% SHW: Shrinkage in boiling water (100 ° C.) Rate SHD: Dry heat (160 ℃) Shrinkage