JPH0382840A - Stretch-type combined filament yarn and production thereof - Google Patents

Abstract

PURPOSE:To obtain the subject combined filament yarn useful for sports clothing, etc., having specific bulkiness in a short process by performing mixed spinning to form a construction in which a non-elastic ultrathin multifilament is arranged in sheath part and an elastic filament is arranged in core part and twisting. CONSTITUTION:A non-divided type filament composed of multifilament or a monofilament of an elastic polymer and a divided type conjugate filament are subjected to conjugate spinning from same cap so as to form a combined filament yarn in which the non-divided type filament is arranged in core part and the divided type conjugate filament is arranged in sheath part, then >=100T/M real twist is applied to the resultant yarn with drawing by drawing frame to afford the aimed combined filament yarn having >=2.5 bulkiness expressed by the formula. Said divided type conjugate filament composed of plural species of polymer has a cross section in which other component A is plurality divided by one component B and becomes a non-elastic ultrathin multifilament having <=0.8 denier single yarn size by fibrillating treatment after weaving.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a stretchable mixed fiber yarn having a core-sheath structure in which ultrafine filaments are located in the sheath portion and one elastic filament is located in the core portion.

(Prior Art) It is well known that fabrics using fine-grained fibers have a flexible surface touch, and have a wide range of uses.

However, in these applications, stretchability is often required at the same time to take advantage of the soft texture.

Many proposals have been made so far regarding raw fibers for stretchable woven and knitted fabrics that are soft to the touch when placed on the surface.

For example, Japanese Patent Publication No. 63-67571 states, ``False twist of conjugate yarn consisting of polybutylene terephthalate polymer and other polyester polymer = 2, crimped yarn and polyester with single yarn fineness of 1.2 denier or less. A woven fabric using a composite yarn composed of ultra-fine filament yarn is proposed.

However, side-by-side type or equestrian sheath core type conjugate yarns of polybutylene terephthalate and other polyester polymers, such as polyethylene terephthalate, do not have sufficient crimpability, and even when they are false-twisted, they cannot be fabricated. It is not possible to sufficiently develop the stretchability after applying.

In addition, Japanese Patent Publication No. 62-50583 describes ``a temporarily crimped yarn consisting of two types of filament yarns.

One filament thread is used as a core thread, and the other filament thread is wound around it, and some of the filaments that make up the wrapped thread are randomly mixed and intertwined with the core filament, and the entire crimping system wraps around the core thread. A stretchable crimped yarn has been proposed in which the filament constituting the core is a side-by-side composite yarn of polyurethane elastomer and polyamide polymer, in which the filament constitutes the core of the yarn, which is a two-layered yarn wound in an alternating manner. In this case, although the side-by-side type composite yarn serving as the core yarn has a high degree of crimpness and sufficient stretchability, the use of a two-layer structure yarn as described above requires a special false twisting device, resulting in high cost. or.

The other filament wound around the core yarn I is not particularly made of ultra-fine yarn, and when knitted into a 1 m knitted fabric, the surface softness is poor.

JP-A-61-194247 states that ``The core component is made of an elastic polymer (4), and the sheath component is made of an inelastic polymer (4).
B) is an island component and a soluble polymer (0) is a sea component, which is a sea-island phase composite fiber. As described above, fabrics using the composite fibers in which the polymer (B) has a fiber density of less than 0.16 denier have been disclosed.

When using the polymer blending method of sheath component polymer CB) and polymer (C), a normal sheath/core type cap can be used as the cap. In the case of using a multi-faceted bonding phase in which the and are alternately present in a radial pattern, there is a drawback that the specifications of the cap are complicated and the equipment cost is high. In either case, the sheath and core components are conjugated, so in this case,
The bulk ratio (-diameter of composite yarn/diameter of core component) is about 1.5 to 2, and the bulkiness is low, so the flexibility of the surface touch of the knitted fabric is still insufficient.

(Problems to be Solved by the Invention) The purpose of the present invention is to improve the conventional drawbacks, to provide a blended yarn that has a very soft surface touch and good stretchability, and to efficiently produce the blended yarn. The goal is to provide a way to do so.

(Means for Solving the Problems) In order to solve the above problems, the present invention includes the following configuration.

That is, it is a mixed fiber yarn in which an inelastic ultrafine multifilament with a single yarn fineness of 048 denier or less is located in the sheath portion and one elastic filament is located in the core portion, and the mixed fiber yarn has a real twist of 100 T / M or more, This is a stretchable mixed fiber yarn characterized by having a bulk ratio of 2.5 or more as described below.

Bulk ratio = diameter of mixed yarn/diameter of elastic filament.

In addition, the method for producing a stretchable mixed fiber yarn of the present invention involves joining multiple types of high molecular weight polymers into a cross-sectional shape in which one component divides the other component into a plurality of pieces. An undrawn yarn of a splittable composite WA fiber with a component of 0.8 denier or less and an elastic filament are spun from the same spinneret to form a mixed fiber yarn, and then stretched using a drawing/twisting machine for 10 minutes.
After applying a real twist of 0 T/M or more and winding it up, it is made into a core-sheath mixed yarn with an elastic filament in the core and split composite fibers in the sheath, and after knitting and weaving using the core-sheath mixed yarn. , is a manufacturing method characterized by performing fibrillation treatment of split type composite M4 fibers.

Below, one constituent feature of the present invention will be explained in detail.

An example of the form of the mixed fiber multifilament of the present invention when the filaments are disintegrated across the east is shown in FIGS. 1 and 2. (a
) is an undivided filament and consists of an elastic polymer. (1) 1 is an inelastic ultrafine multifilament with a single fiber fineness of 0.8 denier or less. The non-divided 6-split filament may be either a multifilament (FIG. 1) or a monofilament (FIG. 2), and occupies approximately the center of the mixed multifilament bundle, and is surrounded by inelastic ultrafine multifilaments.

The undivided filament is arranged approximately at the center of the mixed multifilament bundle, and the mixed multifilament is twisted at 100'I'/M or more. If the number of twists is small, it will be a mixed yarn of single elastic filament and inelastic multifilament (i.e. split type composite multifilament), so the elastic filament will stretch due to various tensions during the manufacturing process and will eventually be twisted. The split composite filaments in the mixed multifilament will become loose and sag, which often causes trouble in subsequent processes such as weaving and knitting. By adding twists, the sag can be reduced, and therefore the number of twists is required to be IQOT/M or more, preferably 200'I'/M or more.

However, if the number of twists is too large, the texture after knitting the rope will tend to be rough and hard, so the number of twists should be determined by considering the texture.

Furthermore, the bulk ratio of the mixed yarn, which is an important component of the present invention, will be described. The bulk factor is the diameter of the mixed yarn divided by the diameter of the elastic filament when a tension of 5 mg/d is applied, and the diameter of the mixed yarn is l[). The diameter of the entire mixed fiber yarn occupied by the ringed ultrafine multifilament is referred to as the diameter of the elastic filament, and the diameter of the elastic filament refers to the diameter of the elastic monofilament located in the core portion or the diameter of the entire elastic multifilament. The larger the bulk factor, the greater the spread of the covered ultrafine yarns, and as a result, the flexibility of the knitted fabric can be obtained as if it were a stone-like touch.

In the present invention, it is desirable that the bulk factor is usually 2.5 or more, preferably 5 to 6 or more.

Next, the method for manufacturing the mixed fiber multifilament will be explained.

The inelastic ultrafine multifilament located in the sheath portion can be obtained by fibrillating a split composite filament after one weave. The split-type composite filament before treatment has a cross-sectional shape in which one component is divided into a plurality of pieces, and the other component is divided into a plurality of pieces, and examples of the cross-sectional cylindrical shape are shown in FIGS. 3 to 8. . The split type composite filament is a type in which only the component (a) remains after the component (b) in Figures 3 to 8 is dissolved and removed, or a type in which only the component (a) in Figures 2 to 5 remains.
It may be of a type in which the components (a) and (b) in the figure are split by chemical or physical treatment and both components remain. As for the former, it is preferable that component (a) is polyester or polyamide and component (b) is an alkali easily soluble polymer. As for the latter, it is preferable that the (a) component and the (b) component are a combination of polyester, polyamide, or polyolefin, and most preferably, the (a) component is a polyester and the (b) component is a polyester.
This is a combination in which the component is polyamide. The polyester herein refers to polyethylene terephthalate, polybutylene terephthalate, or a product obtained by copolymerizing these with a small amount of isophthalic acid and its derivatives, polyethylene glycol, etc., and polyethylene terephthalate is most preferred. As the polyamide, nylon 6 and nylon 66 are preferred. Polyethylene is a polyolefin.

Examples include polypropylene, but polypropylene is preferred from the viewpoint of composite spinnability. The alkali easily soluble polymer has a different solubility from the polymer of component A and the non-split type filament, and there is no particular specification as long as it is a fiber-forming polymer, but a-removal flame treatment can be performed in an aqueous system. In this respect, alkali easily soluble polymers are preferred. As an alkali easily soluble polymer, polyethylene terephthalate]
Examples include those copolymerized with 2.5 mol % or more, preferably 3 mol % or more of 5-sulfoisophthalic acid or its metal salt, and those copolymerized with 6 wt % or more of polyethylene glycol.

In the splittable composite multifilament, the single fiber fineness of component A after dissolution treatment and components A and B after 'IJJm treatment is preferably 0.8 denier or less. If the denier exceeds 0.8 denier, the softness of the IIA knitted fabric to the touch of surface pain cannot be sufficiently expressed. It is preferably 0.5 denier or less.

Figure 3 shows the cross-sectional shape of the split composite multifilament.
It is shown in FIG.

10- The non-dividable filament is an elastic polymer, and polyurethane-based or polyester-based elastomers can be used, but polybutylene terephthalate-based elastomers are preferred from the viewpoint of thermal stability. That is, the average molecular weight 5
At least one polymer diol selected from 00 to 3000 polyester diols, polyether diols, polyester ether diols, polylactone diols, and polycarbonate diols, butylene glycol, and terephthalic acid; It is obtained by condensation reaction with molecular weight diol.

The fineness of the non-divided multifilament is preferably 1 to 20 deniers. If it is less than 1 denier, it is difficult to spin because it is a 1 elastic polymer, and if it exceeds 5 denier, it is difficult to spin.
The texture of objects becomes hard.

It is preferable that the splittable composite filament and the non-splitable filament are spun and mixed at the same time from the same spinneret. When simultaneously spinning from the same die, as shown in Figs. 9 and 10, the spindle cylinder (c) + the discharge hole (
The split type composite filament is inserted through the dl, and the non-divided type filament is inserted through the discharge hole arranged on the inner circumference (Fig. 8 (e)) or the single hole arranged in the center (Fig. 9 (e')). Each is spun simultaneously.

Such three-component composite spinning can be carried out by using an apparatus as shown in FIG. 11 and a die pack as shown in FIG. 12.

The process after mixing the splittable composite filament and the non-splittable filament may be as follows.

First, after winding up the undrawn yarn, it is stretched using a drawing/twisting machine, giving an actual twist of 100 T/M or more and winding it up, and after knitting and weaving using the core-sheath mixed yarn, the splittable composite fiber In this method, a stretchable mixed fiber yarn is obtained by performing a fibrillation treatment.

In this case, the elastic filament 1 has a strong force to return to its original state even after being stretched, so by increasing the spindle rotation speed when winding into the pirn after stretching, the inelastic split-type composite filament becomes an elastic filament. It will wrap around itself as if being covered. As mentioned above, the number of turns is 10.
It is necessary that it is 0T/M or more, preferably 200T/M.
M or more. In addition, by increasing the winding speed during spinning and using highly oriented yarn in the next step and lowering the drawing speed, more twists can be added, and the elastic filament can be spun within the range that can be wound. It is better to increase the speed.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

(Example) <Example 1> Using the apparatus shown in FIGS. 11 and 12, 24 splittable composite filaments and 16 non-splitable filaments were discharged from the nozzle shown in FIG. 9. The cross-sectional shape of the split filament is shown in Figure 4.The A component is polyethylene terephthalate, the B component is polyethylene terephthalate copolymerized with 5 mol% of sodium 5-sulfoisophthalate, and the composite of the A component and B component is the volume. It was discharged from a 24 m discharge hole arranged on the outer circumference at a ratio of 3:1. The total discharge amount of the split type composite multifilament was 21 g/min.

On the other hand, the cross-sectional shape of the non-dividable filament is circular,
A polybutylene terephthalate elastomer (Hytrel 4047 manufactured by DuPont) was used and discharged from 16 discharge holes arranged on the inner circumference. The total discharge amount of the non-divided multifilament was 15 g/min. The discharged thread was wound up at a speed of 1,000 m/min. When the obtained undrawn yarn was drawn and heat-treated using a drawing/twisting machine, the hot roller temperature was 84° C., the plate heater temperature was 120° C., and the drawing ratio was 3.5 times. Further, the rotational speed of the drawn yarn winding spindle was fixed at 950 Orpm, and the number of twists was changed as appropriate by changing the drawn yarn delivery speed. Each of the obtained yarns was knitted in 18G jersey, and they were mixed with 1% NaOH.
The aqueous solution was treated at 98° C. for 20 minutes to dissolve and remove component B in the split type composite filament. The results are shown in Table 1.

The drawn yarn has a fineness of 92 denier when tension ``FI'' and sagging are eliminated, and the non-split type filament has a fineness of 40 d/16.
f (single yarn fineness 2.5 d), split type composite filament has 52 d/24 f, and after alkali treatment of split type filament, it has 33 d/192 f (single yarn fineness 0.
2d) polyethylene terephthalate filament was obtained.

As shown in Table 1, if the number of twists is not 100 T/M or more, knitting properties will be poor, and it was found that 200 T/M or more is preferable. Incidentally, the cross-sectional shape of the mixed fiber multifilament after the alkali treatment with NO2 is shown in FIG.

<Example 2> Using the apparatus shown in FIGS. 11 and 12, 24 min'#J-type filaments and one non-split type filament were discharged from the nozzle shown in FIG. 10. The cross-sectional shape of the split filament is shown in Figure 4, where the A component is polyethylene terephthalate, the B component is nylon 6, and the composite ratio of the A component and B component is 2=1 in terms of capacity, and they are arranged on the outer circumference. 24
It was discharged from several discharge holes. The total discharge amount of the split type composite multifilament was 21 g/min. On the other hand, the valve segmented filament had a circular cross section and was made of the same polymer as in Example 1.
It was discharged from a single hole in the center of the nozzle at a rate of 5 g/min.

These are rolled up at 1,500 m/min and then stretched at a stretching ratio of 2
．． 5. Hot roller 84℃, plate heater 120
°C, stretching speed 50 m/min, spindle rotation 111500
It was twisted and wound at rpm. The bulk factor was 4.0. The obtained yarn was knitted in 18G jersey in the same manner as in Example 1. 5 knitted fabrics
% benzyl alcohol aqueous emulsion for 5 minutes, and then washed with water at 50°C.

The obtained knitted fabric had a soft surface touch and excellent stretchability. The transverse cylindrical shape of the treated mixed multifilament constituting the knitted fabric was as shown in FIG.

(Effect of the invention) By using the mixed fiber multifilament of the present invention,
A woven or knitted fabric with an extremely soft surface touch and excellent stretch properties can be obtained. Particularly suitable for sports clothing, baby clothing, and children's clothing. Further, according to the method of the present invention, the mixed fiber multifilament of the present invention can be obtained in a short process, productivity and workability are improved, and the method is extremely useful industrially.

[Brief explanation of drawings]

FIGS. 1 and 2 are examples of the cross-sectional shape of the mixed fiber multifilament of the present invention, and FIGS. 3 to 8 show the ultrafine filaments included in the mixed fiber multifilament of the present invention before fibrillation treatment. This is an example of a transverse cylindrical shape of a split type composite filament. 9 to 10 are examples of spinnerets for mixed fiber multifilaments of the present invention, and FIGS. 11 to 1
Figure 2 is a simplified diagram of the spinning device. Figure 1 Figure 10 Figure 11 Figure Figure 12 Figure 12

Claims (2)

[Claims] (1) A mixed fiber yarn in which an inelastic ultrafine multifilament with a single yarn fineness of 0.8 denier or less is located in the sheath and an elastic filament is located in the core, and the mixed fiber yarn has a real twist of 100 T/M or more. A stretchable mixed fiber yarn having the following bulkiness ratio of 2.5 or more. Bulk ratio = diameter of mixed yarn/diameter of elastic filament. (2) A split type composite made by joining multiple types of high molecular weight polymers into a cross-sectional shape in which one component divides the other component into multiple pieces, and each component after stretching and splitting has a size of 0.8 denier or less. The fiber and the elastic filament are spun from the same spinneret to form a mixed fiber yarn, which is then stretched using a drawing/twisting machine while applying a real twist of 100 T/M or more and wound up, so that the elastic filament is in the core and the sheath is A stretchable mixed fiber yarn characterized in that it has a core-sheath mixed fiber yarn in which splittable composite fibers are located in a portion thereof, and after knitting and weaving using the core-sheath mixed fiber yarn, the splittable composite fibers are subjected to fibrillation treatment. manufacturing method.