JPH02264025A - Polyester combined yarn for woven or knit fabric - Google Patents

Abstract

PURPOSE:To obtain the subject novel yarn having softness, flexibility, stiffness or anti-drape stiffness, etc., and excellent passing. through property in post processing by confounding self-extending polyester multifilament yarn with heat-shrinkable polyester multifilament yarn respectively having specific physical properties. CONSTITUTION:Two species of multifilament yarns composed of (A) polyester multifilament yarn having <=1.4d single yarn denier, 0.02-3wt.% titanium oxide content, >=0% shrinkage in boiling water SHW and <=0% dry heat-shrinkage SHD at 160 deg.C and (B) polyester multifilament yarn having >=1d single fiber denier, >=4g/d breaking strength and >=0% SHW, and >=5% difference between SHD of the yarn B and SHD of the yarn A are confounded so as content of the yarn A to be 20-80% in denier ratio and the yarn B to be 80-20% in denier ratio with 20-100 pieces/m confounding degree to afford the aimed yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a polyester composite yarn for silk-like woven or knitted fabrics that is soft and flexible, has a dry touch, and has appropriate elasticity, stiffness, and drape properties.

(Prior Art) Polyester multifilaments have been used for various purposes such as clothing and industrial materials due to their excellent properties. For clothing applications, silk-like texture is one of the targets, and various companies are considering it, and in some fields, a texture superior to that of silk has been obtained. Composite yarns made of multifilaments exhibit excellent properties and textures such as fullness, sublimeness, and warm feel, and are widely used. However, if all the multifilaments that make up the yarn shrink due to heat, silk 11! Due to the binding force of the material's structure, it is not possible to ensure a sufficient difference in the shrinkage rate of the yarn, and the knitted fabric tends to become stiffer due to the shrinkage of the yarn. Measures have been taken to ensure this, such as increasing the alkali weight loss rate. However, filaments with a high heat shrinkage rate generally harden when heat-treated, making it impossible to obtain a filament that is fully satisfactory in terms of feel.On the other hand, mixed yarns of polyester filaments that elongate and filaments that shrink when heat-treated are also known. , for example, JP-A-55-62240, JP-A-56-112537, JP-A-60-2851.
There are publications such as Publication No. 5. Although these yarns had a much softer and more flexible texture than the previously mentioned shrink yarns, the loops made of elongated and protruding filaments gave a slimy feel, and heat treatment caused large yarn length differences. As a result, the threads separate, causing problems in handling in subsequent processes.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned drawbacks of the conventional polyester filament, and has softness, flexibility, elegant dry touch, appropriate elasticity, waist, and drapability, as well as The purpose of the present invention is to provide a new polyester composite yarn that does not have any problems in passing through the process.

(Means for Solving the Problems) The present invention has the following configuration in order to solve the problems. That is, it is a composite yarn composed of multifilament yarn A and multifilament yarn B whose yarn physical properties satisfy the following range, and the composite yarn has an entanglement degree of 2.
This is a polyester composite yarn for woven or knitted fabrics, characterized in that it is entangled at a rate of 0 to 100 threads/m.

Multifilament yarn A: Single yarn of 1.4 denier or less, polyester multifilament yarn with titanium oxide content of 0.02 to 3.0% by weight (content in composite yarn: 20 to 80% [denier ratio]) Multifilament yarn B: Polyester multifilament yarn with a single yarn of 1.0 denier or more and a breaking strength of 4 g/denier or more (content in composite yarn 80-20% [denier ratio]) SHW (^) ≧ 0% SOD (A) 50 %311N(
B)≧0% 5OD(B)-3IID(＾)≧5% SO: Spring water shrinkage rate (%) S■: Dry heat (160°C) shrinkage rate (%) Below, the present invention will be explained in more detail, do,.

FIG. 1 is a model diagram after the polyester composite yarn of the present invention is heat-treated to develop a yarn length difference.

In FIG. 1, A is a multifilament that mainly constitutes the sheath, and is a multifilament that has been substantially elongated by high-temperature heat treatment (multifilament after spontaneous elongation), and B is a multifilament that constitutes the core. This is a multifilament that has been shrunk by heat treatment (multifilament after heat shrinkage).

First, let us discuss the heat shrinkage characteristics of the multifilament of the present invention.The multifilament A that constitutes the polyester composite yarn of the present invention has a small shrinkage rate difference with multifilament B during normal sizing and other processes. Therefore, even when the same yarn length difference is produced in the fabric, the yarn length difference (ram, loop, etc.) does not appear much even if the yarn is sized at the yarn stage, and all normal yarn length differences are Even compared to heat-shrinkable mixed fiber yarns, it has much better handling and weaving properties during weaving.

In other words, when a yarn length difference (loop) occurs in the yarn state, naturally the loops of beaming and weaving rub against each other and get caught in guides, combs, etc., and the shedding becomes poor and process passability is significantly reduced. . Furthermore, when ordinary heat-shrinkable multifilament undergoes heat treatment during sizing, etc., the heat set is almost fixed, and even when subjected to high-temperature heat treatment of about 160 to 180 degrees Celsius during final setting, the yarn length difference is not much greater than that at the initial heat setting. However, by including multifilaments that shrink in hot water but elongate in high-temperature heat treatment, which corresponds to final set, as in the composite yarn of the present invention, finishing processing at a higher temperature than the overall shrunk fabric surface is possible. This causes the multifilament A to protrude in a loop shape, providing a soft and flexible touch similar to the surface of a peach. For this reason, 5OS1 (^
)≧0%, 5110(^)50% is required. SHD (B) -S to further expand and add sublimity
It is necessary that HD (^)≧5%, and if it is less than 5%, swelling and bulkiness will be poor, and therefore it will be excluded from the present invention. However, if it is too large, the protruding loop from the surface will become too large, which can easily cause problems such as "shininess" when ironing, etc.
0% or less is preferable, and for the same reason, 5IIS1 (^
) is preferably 5% or less, and S II D (A) is preferably -15% or more.

Next, the elongation at break of the multifilament A is preferably 50% or more, in order to obtain a soft and flexible texture.

In general, in order to obtain a soft feel with polyester, it is easier to obtain a filament with a small 5IIN and a large elongation at break.As detailed above, forming loops and covering the surface of the fabric is due to spontaneous elongation. This is because it is a multifilament, and the touch of this multifilament determines the touch of the fabric. However, if the failure elongation is too large, the handling properties will be poor, so it is preferably 100% or less, more preferably 80% or less.

Next, the elongation at break of multifilament B is preferably 40% or less, in order to prevent yarn irregularities caused by elongation of the composite yarn in subsequent processes such as winding, knitting, and weaving. This is to prevent problems such as knee failure. Furthermore, since the breaking strength of the composite yarn is also substantially dependent on the multifilament B, the breaking strength of the multifilament B must be at least 4 g/denier, and the denier ratio of the composite yarn must be 20% or more.

Of course, if the breaking strength is high, the proportion of multifilament B may be slightly lower, but if it is less than 20%, the shrinkage force of multifilament B will be small and the bulge due to the difference in yarn length will not be expressed, so it is excluded from the present invention. Note that the hot water absorption rate and 160° C. dry heat shrinkage rate of the multifilament B are preferably 5 to 60% and 7 to 80%, respectively.

Next is the single yarn denier of the polyester composite yarn,
In order to emphasize the firmness and elasticity of the finished fabric, as well as the soft feel of the surface of a beach, multifilament yarn A should be a single yarn of 1.4 denier or less, and multifilament B should be a single yarn of 1.0 denier. One denier or above is essential. Preferably, the multifilament yarn A is a single yarn of 0.1 to 0.7 denier, and the single yarn is 0.1 to 0.2 denier, and the multifilament yarn B is a single yarn of 1.5 to 3 denier.

If the multifilament yarn A is less than 0.1 denier than the single yarn, the effect of the present invention will not be limited,
The production of fluff during the weaving process makes it industrially difficult to produce a fabric with a uniform surface condition.

When the multifilament yarn A exceeds 1.4 denier, it is soft, but the effect is weak.

If the multifilament yarn B is less than 1 denier, it will not have firmness or stiffness and will become fluffy, and if it exceeds 3 denier, it will have a rough and hard texture.

The filament cross section may be round or irregularly shaped.
In order to make the fabric soft and dry to the touch, a polygonal cross section such as a triangular cross section or a multilobal cross section such as a trilobal cross section is preferred.In order to increase the bending elasticity of the fabric, at least the filament yarn B should have a hollowness ratio of 5 to 30. In order to reduce the hollow cross section and bending elasticity of the filament yarn B, it is preferable that at least the filament yarn B has a flat cross section.

Next, multifilament yarn A contains 0.02 titanium oxide.
The content must be ~3.0% by weight, which is due to the knitting and dyeing of fine denier yarns such as multifilament yarn A, compared to knitted fabrics using yarns of normal fineness. , this is done in consideration of the fact that vivid colors deteriorate. That is, if the titanium oxide content exceeds 3.0% by weight, it is undesirable because in addition to the dull effect peculiar to fine denier yarn, the sharpness further decreases, and it is also undesirable because the wear during passing through the process increases. On the other hand, if it is less than 0.02% by weight, the finished fabric will become too slimy, which is undesirable, but from the viewpoint of the clarity of the finished fabric, it is preferably 0.02 to 1.0% by weight.

Furthermore, the polyester composite yarn of the present invention has an entanglement degree of 20 to 100.
It is essential that the entanglement is at 1/m, and the degree of entanglement is 20
If it is less than that, the multifilament yarns are likely to separate from each other, significantly impeding processability. On the other hand, if the degree of entanglement exceeds 100, the interlaced mark ring will stand out on the fabric, and the multifilament yarn A will break off, becoming fluffy, and loops will occur, which is not desirable.

Furthermore, the polyester referred to in the polyester composite yarn of the present invention includes polyester terephthalate having substantially only ethylene terephthalate as a repeating unit, a copolymer of ethylene terephthalate and ethylene isophthalate, etc., and if necessary, 5-metal sulfoisophthalic acid, Refers to polyethylene terephthalate containing matting agents such as metallized substances and other finely divided inert substances.

To obtain the polyester composite yarn of the present invention, the spinning speed is 200.
The polyester end was spun at 0 to 4000 m/sin at a stretching temperature of Tg-7g+20°C and 0E2 after stretching.
Stretched in the range of 5 to 45%, Δn 0.10 to 0.14,
After that, spontaneously extensible polyester multifilament yarn A was subjected to relaxing heat treatment using a non-contact heater, and heat-shrinkable polyester multifilament yarn B was prepared in advance.
It is obtained by mixing the fibers with an entanglement degree of 20 to 100 pieces/m. If the spinning speed is less than 2000 m/win, the mobility after stretching will be unstable and the thickness will be uneven (thus, it will be excluded from the scope of the present invention.If the spinning speed is less than 4000 m/mln, the heat shrinkage rate after stretching will be low. Spontaneous elongation is low and the texture of the woven or knitted fabric is not as specified, preferably 20
00-4000m/win. A stretching temperature of 78° C. or higher is required for stretching stability, and at temperatures higher than Tg + 20° C., crystallization progresses and spontaneous extensibility decreases. Although the stretching temperature is important for spontaneous elongation, the elongation at break needs to be 30% or more in terms of flexibility such as thread breakage during stretching. If the elongation at break is 45% or more, yarn unevenness will occur, which is undesirable.In total, Δn should be 0. lO~0.14
Outside this range, the stability of spontaneous elongation due to relaxing heat treatment will be lacking.

Next, relaxing heat treatment using a non-contact heater that gives spontaneous elongation is performed at a heater temperature T ('C) that simultaneously satisfies the following equations (1) and 2) and an overfeed rate of 20 to 6.
It is necessary to perform this at 0%.

751og(,rl)vGu'HL) +4. h67
≧T ≧251og (F-cho Yman7HL) + 4. L mouth ry −(1)T ≧T−−10 (
2) D: Denier after relaxing V: Relax take-up roller speed (m/5in) H=
Relax non-contact heater length (m) T-: Melting point ('C
) Tg: Second-order transition point temperature (° C.) The present inventors have found a relationship between the heater temperature and spontaneous elongation, and the relationship between denier, relaxation processing speed, and non-contact type heater length as shown in equation (1).

If it is higher than the range of formula (1), the spontaneous extensibility will decrease due to the progress of crystallization, and if the nail strength is low, the expression of spontaneous extensibility will be weakened. In addition, it is necessary to satisfy equations (1) and (2) at the same time, but if the heater temperature is set to (T--to)'C or higher, the heat of the heater will cause multi-function while the heater is stopped. The filament melts and restartability deteriorates, making it unsuitable for industrial use.

In addition, the relaxing take-up roller speed vy is 10 to 1500.
m/min, relax non-contact heater length HL is 0.
1 to 2 m is preferable.

A good overfeed rate is 20% to 60% to express spontaneous elongation and stabilize the operability of relaxing heat treatment.In contact type heaters, the thread tension of the heater is insufficient due to the multifilament running resistance, and the roller Since winding and thread breakage occur, a non-contact heater is required.

This polyester multifilament A and polyester multifilament B have a denier ratio of 20 to 80%.
The total degree of confounding is 20-100 so that /80-20%
The degree of confounding is processed using co/m.

In order to make a 18-knit fabric with good swelling, tension, elasticity, and bulkiness due to the yarn length difference after dyeing and setting treatment, the polyester multifilament B component should have a clean water shrinkage rate of 5% or more and a 160°C dry heat shrinkage rate. If it is lower than this, sufficient yarn length difference will not be obtained and a woven or knitted fabric with good texture will not be obtained.The spring water shrinkage rate is 5% to 60%. %, the dry heat shrinkage rate at 160°C is preferably 7 to 80%.Of course, the polyester multifilament may be a so-called thick-and-thin yarn or spontaneously extensible yarn, but in the case of the former, the dry heat shrinkage rate at 160°C is preferably 7 to 80%. It is sufficient that the elongation difference is 0% or less and the difference in elongation from multifilament A is at least 5%.

It is also important to mix the fibers so that the denier ratio is 20 to 80%. If the spontaneously extensible polyester multifilament is less than 20%, it will swell and lack bulkiness, and if it exceeds 80%, it will not have tension or elasticity. Become something that doesn't exist. The degree of entanglement needs to be 20 to 100 cogs/m in order to obtain ease of handling in twisting, warping, and weaving, and to obtain a uniform appearance in woven or knitted fabrics. If it is less than 20 pieces/m, polyester multifilament A and polyester multifilament B are likely to separate, resulting in poor handling in the next step. 100 pieces/
If it exceeds m, a uniform appearance cannot be obtained in the woven or knitted fabric.By having a configuration of 0 or more, a composite yarn of polyester multifilament A and polyester multifilament B is obtained which has excellent handling properties, spontaneous elongation, and productivity. be able to.

Next, the composite yarn of the present invention may be used in either an untwisted state or a heated state, and in the untwisted state, it has a soft spun touch, and in the heated state, when the number of twists is 15000/J (T/m) or less, The fibers exhibit good yarn tension and are soft and flexible.

In addition, when it exceeds 15,000/r (T/m2), the occurrence of thread difference is suppressed, but the fabric surface touch is soft due to the effect of the phidenyl filament.

The configuration and effects of the present invention will be explained with reference to the following examples, but the present invention is not limited by the following examples.

(Example) Note that the measurement method implemented in the present invention is as follows.

(1) Breaking elongation According to JIS-L-1013 (1981), the sample length (gauge length) was 2 using Toyo Baldwin Tensilon.
00 meters, the S-S curve was measured at a tensile speed of 200 m/min,
The elongation at break was calculated.

(2) Heat shrinkage rate (5 units), dry heat shrinkage rate (SHD) J
According to 15-L-1073, the following was done. In other words, with a wrap reel of appropriate frame circumference, the initial load is 1/10g/denier and it is 8.
Take the winding skein, apply a load of 1/30g/denier to the skein, and measure its length! . Measure (■). The load was then removed and the skein was immersed in boiling water for 30 minutes with a load of 1/1000 g/denier applied. After that, remove the skein from the boiling water, cool it down, and then refill it with 1/30g/
Apply a denier load and measure the length f+ (kaku). Then, after drying at 60℃ for 30 minutes, 1/10
Dry heat 160 with a load of 00 g/denier
Heat treat in oven at ℃. Then, after cooling, reduce to 1/3 again.
A load of 0 g/denier is applied and the length 18 (kaku) is measured. The hot water shrinkage rate (SllW) and the drying shrinkage rate (SHD) are calculated by the following formula.

(3) Degree of entanglement Take out a thread of appropriate length and hang it vertically by applying a load of 1/10 g/denier to the lower end. Next, a suitable needle is inserted into the system, slowly lifted, and the distance 1 (CII) traveled until the load is lifted is measured 100 times, and from this the average value j! (cm) and calculate it using the following formula.

(Example) Example 1, Comparative Example 1.2 Three types of polyethylene terephthalate shown in Table 1 were spun at a spinning speed of 2600 by a conventional method as a heat-stretched multifilament.
An undrawn yarn having a round cross section of 32 denier and 72 filaments was obtained by spinning at a speed of m/min. This undrawn yarn was stretched using the apparatus shown in Fig. 2 (stretching ratio: 1.6 times, hot roller temperature: 280°C), and then subjected to relaxing heat treatment (overfeed rate: 845%, take-up roller speed: 300 cm/in, non-stretching). Contact heater temperature: 180℃), followed by 5I
N(B) -15% and 5OD(B) -17% were mixed with a heat-shrinkable filament yarn having a round cross section of 50 denier 36 filament having a breaking strength of 4.8 g/d, and each composite yarn was wound up.

At this time, the heat-stretched multifilament is 29 denier 72 filament with 5 IN-
They were 0.8%, SHD--3.2%, and OH-88%. For the mixed fibers, an air jet FG-1 manufactured by Fiber Guide Co., Ltd. was used as the air nozzle 7, and the feed ratio between the feed roller 6 and the delivery roller 8 and the air pressure of the air nozzle were adjusted to achieve a degree of entanglement of 60. Ko/
It was set as m.

The composite yarn of 79 denier and 10B filament obtained above was subjected to an additional twist of S twist of 400 T/m, and warped as a warp without sizing. The weft is a normal 75 denier semi-dull polyester yarn with S12 twist, 300,077 m of strong twist set yarn, and is woven into a water jet loom (IJ- 41, 44 at rotation speed 400 rpm)
A 1-inch wide fabric was woven and subjected to normal post-processing. The results are shown in Table 1.

As is clear from Table 1, No. 11L, the fabric using the composite yarn of the present invention had a powder touch and excellent sharpness.

Example 2, Comparative Example 3.4 The heat-stretched multifilament and heat-shrinkable filament obtained by the same method as in Example 1 were mixed, except that the yarn used as shown in Table 2 was changed, and after additional twisting, the product was made without glue. It was thin. The results are shown in Table 2.

As is clear from Table 2, the woven fabric using the composite yarn of the present invention had a rich powder-like feel, was soft and had excellent tension, elasticity, and fabric durability.

Example 3, Comparative Examples 5 to 12 Normal polyester (
DE after stretching and relaxing titanium oxide content 0.35% by weight at a spinning winding speed of 3000rrf/sin in a conventional manner.
%StV, SHD became the physical properties shown in Table 3 (multifilament yarn A of 29 denier 72 filament (round cross section) was obtained by changing the spinning discharge rate, stretching ratio, relaxation rate, relaxation temperature, and setting time. .A heat-shrinkable multifilament made by Toyobo ■ and Toyobo Ester, which is commercially available, was used and processed with the drawing-relaxing machine shown in Fig. 2 to obtain multifilament yarn B of 30 denier and 18 filaments (round cross section). The nozzle 7 uses an air jet PG-1 made by Fiber Guide Co., Ltd., and adjusts the air pressure, feed roller 6, and delivery to achieve the desired degree of entanglement.
The feed ratio between rollers 8 was adjusted. The physical properties of the raw yarn used, the yarn quality of the obtained composite yarn, and the feel of a fabric that was twisted in a conventional manner, then made into deshin fibers, and dyed and finished were evaluated. In addition, as for process passability, evaluations were made particularly regarding twisting, thread return, and fibre-making properties, and the overall evaluations from the viewpoints of process passability and texture are shown in Table 3.

As is clear from Table 3 below, the woven fabric using the composite yarn of the present invention was excellent in appearance, texture, processability, etc.

(Effects of the Invention) The polyester composite yarn of the present invention provides a fabric with superior surface touch compared to conventional differential shrinkage mixed fiber yarns, as well as good drapability, bulkiness, tension, and stiffness, which is unprecedented. , it became possible to obtain a fabric exhibiting a micropowder touch feeling.

[Brief explanation of drawings]

FIG. 1 is a model diagram in which the polyester composite yarn of the present invention is heat-treated to develop a yarn length difference, and FIG. 2 is a schematic side view showing an example of a 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 patent applicant Toyobo Co., Ltd.

Claims (1)

[Claims] (1) A composite yarn composed of multifilament yarn A and multifilament yarn B whose yarn physical properties satisfy the following range, and the composite yarn has an entanglement degree of 20 to 100 co/
A polyester composite yarn for woven or knitted fabrics, characterized in that it is entangled with m. Multifilament yarn A: Polyester multifilament yarn with a single yarn of 1.4 denier or less and a titanium oxide content of 0.02 to 3.0% by weight (content in the composite yarn of 20 to 8%)
0% [denier ratio]) Multifilament yarn B: polyester multifilament yarn with a single yarn of 1.0 denier or more and a breaking strength of 4 g/denier or more (content in the composite yarn 80-20% [denier ratio]) SHW ( A)≧0%SHD(A)≦0% SHW(B)≧0% SHD(B)-SHD(A)≧5% SHW: Boiling water shrinkage rate (%) SHD: Dry heat (160°C) shrinkage rate ( %)