JPS5936735A - Production of spun-like 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 The present invention provides an improved method for producing spunlike textured yarn, more specifically, an improved method for producing a two-layer structured yarn in which wound yarns are alternately twisted around a core yarn. Regarding.

Conventionally, alternately twisted two-layer structured yarns using false twisting have been manufactured by the method described below.

In other words, when two or more types of filament yarns with different elongations and consisting of a single component are supplied to a supply roller in a stretched or intertwined state and twisted using a false twisting spindle, yarns with lower elongations are difficult to stretch, so the yarn The threads that make up the core of the thread and have a high elongation are easily stretched, so they are twisted so as to surround the outer layer of the thread. When this twisted yarn state is heat-set and then untwisted, a two-layered crimped yarn is obtained in which the threads with low elongation become the core yarn, and the threads with high elongation surround it in an alternating twisted form. .

This two-layer structure yarn has a core yarn that has different properties, tension, and tension in the fabric.
The spun-like properties are significantly improved compared to single-layer yarns because the yarn exhibits elasticity and the winding yarn exhibits a soft, full, and warm feel.

However, since the wrapped yarn is wrapped around the core yarn in a tight bundle, it is difficult for the core yarn itself to crimp, and in terms of elasticity, it is easy to obtain 10% or more with a single layer structure yarn. On the other hand, two-layer structure yarns can only be obtained at a rate of about 5% or less. Maintaining this elasticity is closely related to the difficulty of the sewing process, the appearance of the sewn product, and even the degree of pressure during wear, so it is desirable for spun-like products to have a moderate amount of elasticity (5% to 15%). However, it has been impossible to coexist with the texture characteristics of repulsion, tension, waist, softness, warmth, and bulkiness, as well as appropriate elasticity.

The purpose of the present invention is not only to eliminate the drawback of poor elasticity inherent to the conventional alternately twisted two-layer structure yarn as described above, but also to provide a two-layer yarn with even higher texture and improved texture by imparting even higher strength. Our goal is to provide spun-like structured yarn.

In order to achieve this objective, the inventor of the present invention has conducted extensive research and found that in order to make the double-layered yarn exhibit elasticity, the core yarn can stretch and contract even when the core yarn is bundled by the wrapping yarn. However, it was confirmed that the crimp force of the conventional core yarn overcomes the tightening force and does not cause crimp. Therefore, we assumed that if we use a core yarn with a greater crimp force than the previous ones, the core yarn would also develop crimp, and as a result, stretchability would occur due to crimp, and we conducted further research on the core yarn. As a result of repeated research, it has been found that a latent composite textured yarn consisting of polybutylene terephthalate and other polyesters, particularly polyethylene terephthalate, is extremely useful.

That is, the present invention uses a latent crimp type polyester conjugate filament yarn containing polybutylene terephthalate as one of its components and a polyester filament yarn having a higher breaking elongation than the polyester yarn, by using a taslan type fluid jetting method under low overfeed. This is a method for producing spunwriter-processed yarn, which is characterized by supplying the yarn to a processing area, intertwining the two, and then false-twisting the yarn.

The present invention will be explained in detail below.

The composite form of the latent crimp type polyester conjugate yarn containing polybutylene terephthalate as one component, i.e., one component, is a side-by-side type, an eccentric sheath core type, or a sea-island type in which a polybutylene terephthalate polymer and a polyethylene terephthalate polymer are combined. Any type may be used, but from the standpoint of bulkiness and elasticity, side-by-side type is preferable because of its high elasticity.

On the other hand, the composite ratio of polybutylene polymer and polyethylene terephthalate polymer is preferably in the range of 3/7 to 7/3.

Further, each polymer may be copolymerized with a third component in a proportion of 15 mol% or less (or 15 wt%), and the polymer may not contain additives such as matting agents and colorants. But it doesn't matter. (or blend) Next, the intrinsic viscosity of each polymer [η] is as follows for polybutylene terephthalate:
A value of 0.65 or more is appropriate, and a range of 0.9 to 1.0 is particularly preferred. On the other hand, the polyethylene terephthalate side is 0
．． It is preferably 35 or more and 0.5 or less.

The greater the difference in η between these polymers, the better the stretchability.Thus, this conjugate yarn has a breaking elongation of 30%.
Above, it is preferable to have an elongation of 80% or more,
Desired properties can be obtained by simultaneously stretching and false twisting these materials at a stretching ratio of 60 to 80% of their elongation. Of course, the elongation is 30%
The front and back parts are usually processed with a stretch side of 0 to several percent. Here, when the individual pseudo-twisted yarn of the conduit yarn is woven into both the warp and weft of the fabric, the crimp pitch is significantly finer than that of normal polyester false-twisted yarn,
In addition, the crimping ability is extremely strong, so the fabric obtained is 30
Although it exhibits a high elasticity of more than 10%, it has no inter-filament voids and has a high degree of filling, so it appears as if it had been plastically deformed with no resilience.

In this regard, according to the present invention, in order to improve the hand by taking advantage of the high stretchability of such a conjugate yarn, a polyester yarn having a higher breaking elongation than the conjugated yarn is used in combination, and this polyester yarn is transformed into a two-layer structure yarn. This can be solved by completely separating the functions of the two by having them exist as a wrapping part. In other words, in order to improve the feel of the wrapped yarn by making the core made of conjugate yarn stretchable, it is essential that the wrapped yarn is made of polyester. degree (at least 30% more than the core yarn elongation)
It is necessary that the ratio be larger than 100%, and 100% or more is particularly preferable.

The cross-section of this filament may be round or cross-sectional, and the gloss can be freely selected from bright or dull. In this case, the denier (total denier) ratio of (wrapping yarn/core yarn) is preferably 0.6 or more, and the total denier should be selected depending on the purpose, such as men's suits, women's suits, dresses, skirts, etc. 300~500d,
For jackets, 150 to 250 d is appropriate. Regarding the single fiber denier, it is generally desirable that the core yarn has a denier of 3 d or more, while the denier of the wound yarn can be freely selected depending on the target degree of surface touch from soft to hard.

In the present invention, it is necessary to intertwine the above-mentioned conjugate filament yarn and polyester filament yarn before the false twisting process.

If this interlacing process is lacking, the core yarn and alternately twisted yarn will separate due to the elasticity of the resulting composite false twisted yarn due to its elasticity, which will cause problems in practical use. become. As for the interlacing method, as a result of various studies on the relationship between the processing method and the final cotton, it was found that although there is not much difference in the elasticity obtained depending on the interlacing method, there is a significant difference in the texture. I found out. In other words, it was found that in the composite false-twisted yarn that exhibited a good texture, the intertwined state of the core yarn and the wrapped yarn had an intertwined portion that was strongly mixed in the longitudinal direction. In other words, since the core yarn and the wrapped yarn are mixed in the strong intertwining part, a part of the core yarn may come out to the surface, or the two may be mixed so strongly that a two-layer structure is not formed, and as a result, It is presumed that this causes deterioration of the texture.

From the above results, it is very important to intertwine both yarns lightly and almost uniformly, and the most suitable method for this is not the interlace method but the Taslan nozzle method. The supply rate to the fluid injection processing area is related to the entangling effect of the core yarn and wrapped yarn, and if the overfeed rate is too large, not only will the bond become strong but also loops will occur, so it is necessary to maintain a low overfeed rate. Is it necessary to process it below? The overfeed rate is preferably 10% or less, preferably around 6%.

Next, false twisting is carried out, but since the conjugate yarn and polyester filament yarn are already in a stable intertwined state to the extent that they do not separate, it would be wasteful to proceed with simultaneous stretching and false twisting, or after the fluid jet treatment. You can wind it up once. In addition to the normal spindle type, the temporary winding device uses
A type friction false twisting device or a belt false twisting method can be adopted. When the stretching ratio, particularly the stretching ratio, is 60 to 80% of the cutting elongation of the core yarn, the false twisting processability and the stretchability and feel of the fabric are improved. Only by implementing such a combination of yarns, entanglement processing method, processing conditions, and composite false twisting processing can we satisfy both the texture and stretch properties that could not be achieved with conventional spunlike composite false twisted yarns. becomes possible. In other words, far from diminishing the advantages of spunlike processed yarn, such as anti-burning properties, tension, elasticity, soft feel, warm feel, and bulkiness, the addition of stretchability only enhances the warm feeling and high quality. This improves the ease of sewing in the sewing process, improves the appearance of the sewn product, and eliminates the feeling of pressure when worn.

Example 1 Conduit filament yarn: polybutylene terephthalate (PRT)/polyethylene terephthalate (P
ET) PET[n]=0.87/PET[n]=0.4715
0d/48f, composite ratio PBT/PET=2/3 side-by-side type spinning speed 2500 m/min fully drawn yarn (cutting elongation 30%) with a draw ratio of 1.95.P
ET filament yarn [n] = 0.64 undrawn yarn Spinning speed 3000 m/min 225 d/48 fil (cutting elongation 130%) These two were aligned and fed to a Taslan type fluid injection processing machine,
Entanglement was applied at an overfeed of 6%, and then a spindle type false twisting process (air pressure 4.0 kg/cm3) was performed under the following conditions.

On the other hand, for comparison, the following experiment was conducted by changing the taslan processing to interlacing processing in the above column.

The texture and elasticity of the processed yarns of these Examples and Comparative Examples were evaluated using the following wound yarns.

Using the composite yarn obtained in each example for both spinning and weft, the diameter density was 4.
Contains 2 pieces of 3 birds/whale, and 2/2 as weft over 80/whale.
Create a winding thread, use normal relax, preset (18
0°C x 45 seconds) process. This woven fabric is cut out to have a width of 5 cm and an effective length of 20 cm for both the warp and warp, and a weight of 1.5 kg is applied, and the length after 1 minute is defined as l1. Furthermore, the recovered length l2 1 minute after the load was removed was measured, and the elongation rate and recovery rate were calculated using the following formula.

These results are shown in the table below.

In the case of the present invention, the texture is soft, full, and has good repellency, and the outer layer is also good without any scratches. On the other hand, in the comparative example, the reason why the texture and exterior are inferior is that the two-layer structure collapses intermittently in the longitudinal direction, and some of the core yarn comes out on the surface, resulting in an uneven surface. It is estimated that it has a hard texture.

Example 2 0 conduit filament yarn PBT/PET site-by-side composite ratio: PRT/PET=2/3 PBT(η)=0.87 PET[n]=0.47 Undrawn yarn with spinning speed of 3000 m/min 275d/48fil Breaking elongation 100% ・PET filament yarn "η)=0.64 Undrawn yarn 225d/48f Spinning speed 3
000m/min Cutting elongation 130% Bring these two together and send them to the Taslan type wave body injection processing area.
It was supplied at 6%. (Pneumatic pressure: 4 kg/cm) The interlaced yarn was then subjected to false twisting under the following conditions.

False twisting processing conditions Spindle type heater 190°C Number of twists + 4oo'r, /M Stretching ratio 1.45 times Winding speed 150 m/min Meanwhile, for comparison, interlace processing (IL degree = 60) was performed instead of taslan processing in the above example I went to

0 Weaving test In the case of the present invention, the texture is a smooth spun touch because the surface is covered only with polyester, and the appearance is that the pattern composition is clear because the degree of orientation of the false twisted yarn is good. On the other hand, in the comparative example, the twill opening is unclear due to the unevenness, and differences in dyeing are also observed because the core thread is exposed. The texture is also rough and hard, similar to the examples.

gHQ Applicant Teijin Ltd. Attorney Ben Sokudo 1) + MII 4. lIH'1"',",
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Claims (3)

[Claims] (1) Taslan type fluid jetting of a latent crimp type polyester conjugate filament yarn containing polybutylene terephthalate as one component and a polyester filament yarn having a higher breaking elongation than the polyester yarn under low overfeed. 1. A method for producing spunlike textured yarn, which comprises supplying the yarn to a processing area to intertwine the two, and then subjecting the yarn to false twisting. (2) The method for producing a polyester woven or knitted material according to claim (1), using a conjugate filament yarn in which the other component is polyethylene terephthalate, which has a lower viscosity than polyethylene terephthalate. (3) The method for producing a polyester fabric according to claim (1), wherein the overfeed rate is 15% or less.