JP2002275737A - Bulky yarn having network structure and woven and knitted fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a new bulky yarn highly provided with bulkiness, having improved heat retaining properties and water retention performances by forming a network entanglement structure on the surface of a bulky yarn. SOLUTION: This bulky yarn comprises >=20 mass % of wet-heat adherent crimped filament, at least a part of filaments constituting the bulky yarn is thermally bonded by the wet-heat adherent filament and the bulky yarn has a network structure on the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulky yarn, and more particularly, to the formation of a crimped fiber by wet heat treatment of wet-heat-adhesive crimped fibers by means of crimping and self-bonding, thereby forming a network with a part of the structure of the bulky yarn. The present invention relates to a novel bulky yarn having a structure formed thereon, or a woven or knitted fabric comprising the bulky yarn and having excellent heat retention and water retention.

[0002]

2. Description of the Related Art In the design of a bulky yarn represented by a new synthetic fiber, for example, a processed yarn, a difference in fineness, a difference in cross-sectional shape, a difference in gloss, a difference in elongation, a difference in melting point, a difference in heat shrinkage, etc. Various processed yarns obtained by appropriately combining these with air entanglement, false twist, and the like in yarn processing have been proposed. The surface of these processed yarns exhibits bulkiness due to the presence of looped portions or converging portions due to traces of twists, and the presence of entangled portions, but such processed yarns are insufficient in bulkiness. there were. Further, bulky yarns obtained by mixing a binder fiber having a softening / melting temperature sufficiently lower than the main fiber component and fusing the fibers have been proposed, but are also obtained by mixing a binder fiber. As for the processed yarn, the processed yarn was cured, resulting in insufficient bulkiness.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned object, and provides a high bulkiness by forming a network structure on the surface of a bulky yarn.
An object is to obtain a bulky yarn having improved heat retention and water retention performance.

[0004]

That is, the present invention provides a bulky yarn containing at least 20% by mass of a wet-heat-adhesive crimped fiber,
A bulky yarn characterized in that at least a part of fibers constituting the bulky yarn is thermally bonded by the adhesive crimped fiber, and the surface of the bulky yarn has a network structure.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below. The wet-heat-bonded crimped fiber contained in the bulky yarn of the present invention is a crimped fiber containing a polymer component which is softened by hot water at about 95 to 100 ° C. and self-adhesive or adheres to other fibers. The crimped form of the crimped fiber is a planar zigzag crimp, a three-dimensional crimp by false twist, a side-by-side type composite fiber, an eccentric core-sheath type composite fiber, an asymmetric cooling fiber, and the like. Although it is not particularly limited, such as crimping, it is preferable that the fiber has a three-dimensional crimp from the viewpoint of bulkiness and flexibility, and in particular, false twist crimped fiber is preferably used. On the other hand, in the case of straight yarn such as raw silk, the expression of the above-described three-dimensional random coil cannot be obtained, and the bonded portion is not a dot but a lump, and the hand becomes hard. Moreover, even if it has wet heat adhesiveness, a wet heat adhesive crimped fiber which loses crimp by heat treatment is not preferable because the effect of the present invention cannot be obtained. Further, it is difficult to obtain a target bulky yarn even if a wet heat-bondable fiber having no crimp is mixed with another crimped fiber having no wet-heat adhesion.

[0006] Such a wet-heat-adhesive crimped fiber preferably has a crimp rate of 5% or more, more preferably a fiber having a crimp rate of 10 to 30%. Crimp rate is 5
%, The bulky yarn, which is the object of the present invention, may be difficult to obtain.

As the wet heat adhesive polymer constituting the wet heat adhesive fiber, for example, a copolymer containing nylon 12 or acrylamide as one component, polylactic acid, ethylene-
Examples thereof include a vinyl alcohol-based copolymer, and among them, an ethylene-vinyl alcohol-based copolymer is preferably used. As the ethylene-vinyl alcohol-based copolymer, those obtained by copolymerizing polyvinyl alcohol with 10 to 60 mol% of ethylene residues are preferable, and those obtained by copolymerizing ethylene residues with 30 to 50 mol% are particularly suitable for wet heat bonding. It is preferable in terms of properties. Further, the vinyl alcohol part preferably has a saponification degree of 95 mol% or more. Due to the large number of ethylene residues, it has a unique property that it has wet heat adhesion but is hardly soluble in hot water. The degree of polymerization is not particularly limited, but is preferably about 400 to 1500. In the present invention, the target bulky yarn, or after forming the woven or knitted fabric using the bulky yarn, for post-processing such as imparting dyeability or fiber modification, partially cross-linking ethylene-vinyl alcohol-based copolymer can do.

The wet-heat-adhesive crimped fiber used in the present invention is obtained by coating the surface of a composite fiber of the above-mentioned polymer with another thermoplastic polymer or a fiber made of another thermoplastic polymer. Fiber may be used. As other thermoplastic polymers, polyester, polyamide, polypropylene and the like can be mentioned, but in terms of heat resistance, dimensional stability, etc., polyesters, polyamides and the like having a higher melting point than ethylene-vinyl alcohol copolymers. It is preferably used.

As the polyester, terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, phthalic acid, α, β- (4-carboxyphenoxy) ethane,
Aromatic dicarboxylic acids such as 4,4'-dicarboxydiphenyl, 5-sodium sulfoisophthalic acid, aliphatic dicarboxylic acids such as azelaic acid, adipic acid, sebacic acid and esters thereof, ethylene glycol, diethylene glycol, 1,3 -Propanediol, 1,4-
Fiber-forming polyesters composed of diols such as butanediol, 1,6-hexanediol, neopentyl glycol, cyclohexane-1,4-dimethanol, polyethylene glycol and polytetramethylene glycol. It is preferred that at least mol% be ethylene terephthalate units.

As polyamides, aliphatic polyamides mainly composed of nylon 6, nylon 66 and nylon 12,
Examples thereof include semi-aromatic polyamides, and polyamides containing a small amount of the third component may be used.

When a composite fiber composed of an ethylene-vinyl alcohol copolymer and another thermoplastic polymer is used as the fiber constituting the bulky yarn of the present invention, the composite ratio is the former:
The latter (mass ratio) = 10:90 to 90:10, especially 30:90.
It is preferably from 70 to 70:30 from the viewpoint of spinnability. The composite form is not particularly limited, and a conventionally known composite form can be adopted.However, it is necessary that the ethylene-vinyl alcohol copolymer is present on at least a part of the fiber surface, It is preferable that 50% or more is exposed. Specific examples of the composite form include a core-sheath type, an eccentric core-sheath type, a multilayer bonding type, a side-by-side type, a random composite type, a radial bonding type, and a fine fiber generation type. The cross-sectional shape of these fibers is not limited to a solid cross-sectional shape such as a round cross-section or an irregular cross-sectional shape, but may be various cross-sectional shapes such as a hollow cross-sectional shape. In particular, in the case of using a composite fiber of a fine fiber generation type, it is preferable in terms of feeling to use a bulky yarn composed of a single fiber having a single fiber fineness of 0.56 dtex or less.

[0012] Further, in the case of a fiber in which the surface of another fiber is coated with an ethylene-vinyl alcohol copolymer, it is preferable that the copolymer covers the surface of the other fiber by 1/3 or more. Preferably it is 1/2 or more.

The bulky yarn of the present invention must contain the above-mentioned wet-heat-adhesive crimped fiber in an amount of 20% by mass or more, preferably 30 to 100% by mass, and more preferably 50 to 100% by mass.
%, Particularly preferably 70 to 100% by mass. When the wet heat adhesive crimped fiber is less than 20% by mass,
Adhesion between the fibers becomes insufficient, and the bulky yarns of the present invention cannot be obtained.

On the other hand, the fibers other than the wet-heat-adhesive crimped fibers constituting the bulky yarn of the present invention are not particularly limited, and natural fibers, semi-synthetic fibers, and synthetic fibers can be used. it can. These fibers may also be crimped fibers like the wet-heat-adhesive crimped fibers.

Next, the bulky yarn of the present invention will be described.
The bulky yarn of the present invention can be obtained by using any of a filament and a staple, and has the greatest feature in that the wet-heat-adhesive crimped fibers constituting the bulky yarn are mutually bonded and have a network structure. The network structure according to the present invention is characterized in that the yarn containing the wet-heat-adhesive crimped fiber is crimped by the wet heat treatment, and at the same time, the heat-adhesive component present on the surface of the wet-heat-adhesive crimped fiber is melted, whereby the wet heat is formed. Adhesive crimped fibers are formed by heat bonding to each other and entangled in a network. By having such a structure, a bulky yarn in which a complicated entangled state due to the adhesion of the fibers is developed can be obtained. The wet heat treatment of the present invention can be performed by steam blowing or heating by high-frequency electromagnetic waves, for example, microwaves of 2450 MHz.

When a wet-heat-adhesive crimped filament is used to obtain the bulky yarn of the present invention, it is preferable to use an interlaced yarn. In the case of such an entangled yarn, the presence of a wet heat adhesive filament on the surface of the bulky yarn is more preferable in terms of water retention and water absorption. The entangled yarn can be obtained by a known method, but it is particularly preferable to use an air entangled yarn. As the air entanglement means, either an interlace nozzle or a Taslan nozzle may be used, but the use of a Taslan nozzle increases the entanglement between loops appearing on the surface because the loop formed by air entanglement is more disordered. It is more preferable in terms of forming the network structure of the present invention. In particular, in the present invention, a structure in which a loop protrudes from the surface of the processed yarn by the air entangling treatment is advantageous, so that the conditions for overfeeding are important. Preferably. In this case, it is advantageous to use a Taslan nozzle as the air entanglement means, because the more the loop is disturbed, the greater the chance of contact. Further, it is more preferable that the number of fibers constituting the wet-heat-adhesive crimped fiber is large because it is advantageous for forming the network structure of the present invention.

When the staples are used to obtain the bulky yarn of the present invention, the wet-heat-adhesive crimped staple yarn is used for two times.
A spun card sliver containing 0% by mass or more is subjected to wet heat treatment without passing through the spinning step, whereby the bulky yarn of the present invention can be obtained. The bulky yarn of the present invention is also characterized in that it can be easily obtained by utilizing a known spinning process. A preferred spinning method is wool spinning, in which the fiber arrangement is not very uniform. That is, the fiber arrangement forming the card sliver is not uniform in the length direction,
Advantageously, the entanglement and convergence in a disturbed state increase the chance of contact between the wet-heat-adhesive crimped staple yarns as in the case of the Taslan method.

When the bulky yarn of the present invention is used in a woven or knitted fabric,
The presence of a large number of crimped fibers in the form of loops on the surface facilitates contact within the structure of the woven or knitted fabric, which is advantageous in forming a network structure between the bulky yarns.

Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 shows an enlarged schematic view of a bulky yarn of the present invention obtained by using the Taslan processing. FIG. 1 is also a schematic diagram showing an enlarged example in which a regular polyester raw yarn is used as a core yarn and a wet-heat-adhesive crimped fiber is used as a sheath yarn. A loop 3 is formed such that the wet-heat-adhesive crimped fiber 1 is entangled with the regular polyester raw silk 2, and a large number of fused portions 4 are formed by the heat-heat-adhesive crimped fibers 1 being fused together with their own crimp. It is present and has a net-like network structure. The complex entangled state in the case of the conventional regular false twisting yarn is developed by the Taslan processing, but a structure having a fused portion and entangled in a mesh like the present invention is not known.

FIG. 2 is an enlarged schematic view of a bulky yarn of the present invention obtained by utilizing a spinning process as another example. There are a large number of fused portions 4 due to the fusion of the wet-heat-adhesive crimped fiber 1 at the same time as its own crimping, and the network structure 5
Are formed. The formed network structure 5 (the black portion in FIG. 2) has a portion where the wet-heat-adhesive crimped fibers 1 form a three-dimensional closed loop, and the bulky yarn as a whole has a so-called porous body. It can be said that it is composed.

As an application of the bulky yarn of the present invention, it is possible to use the network structure of the bulky yarn to produce a towel cloth, a mop, or a pile yarn for a mat around water, which is excellent in water absorption and foaming properties. Or, it can be cut and used for water purification. In addition, it can be used as a cleaning tool such as a scourer.

Further, when a polymer having a hydroxyl group such as an ethylene-vinyl alcohol copolymer is used for the bulky yarn of the present invention, the hydroxyl group is chemically modified so that the immobilized enzyme and the three-phase polymer catalyst can be used. It is also possible to apply the yarn as a yarn having such a function. Further, by performing a wet heat treatment in a state of being wound up on a bobbin, it can be used as a filter.

[0023]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the present invention. In addition, each physical property in an Example was calculated | required by the following method. (1) Crimping rate After winding the yarn with a scalpel remover until the scalp becomes 5500 dtex, a load of 10 g is hung at the center of the lower end of the scalpel,
This cassette was fixed on the upper part and subjected to a hot water treatment at 90 ° C. for 30 minutes under a load of 0.009 cN / dtex. Then, the fabric was allowed to dry at room temperature with no load, dried, and again subjected to a load of 10 g, left to stand for 5 minutes, and the yarn length was measured, and this was defined as L1 (mm). Next, a 1 kg load was applied, and the yarn length after standing for 30 seconds was measured.
m) was calculated by the following equation. Crimp rate (%) = {(L2-L1) / L2} × 100 (2) Existence of network structure Observed by a scanning electron microscope (SEM), a fused portion due to adhesion between fibers, a structure entangled in a net shape. Confirmed the existence of.

Example 1 Polyethylene terephthalate containing 3% by mass of fine-particle silica (intrinsic viscosity = 0.68 measured at 30 ° C. in a mixed solvent of phenol / tetrachloroethane, etc.) was used as a core component, and ethylene was used as a sheath component. 40 mol%, MI
= 10 using an ethylene-vinyl alcohol-based polymer,
A core-sheath composite fiber was obtained. (Core / sheath ratio = 50/50, 16
7dtex / 48 filaments). This fiber was subjected to false twisting at a number of false twists of 2350 T / M, a single-stage heater temperature of 120 ° C., and a two-stage heater temperature of 135 ° C. to obtain a wet-heat-adhesive crimped filament. The crimp rate of the obtained false twisted yarn was 17%. Two pieces of the above-mentioned wet-heat-adhesive crimped fiber are arranged on the sheath side, and one 167 dtex polyethylene terephthalate false twisted yarn is separately arranged on the core side, and the air pressure is 3.0 k.
g / cm ^2, it was subjected to Tasuran machining by setting the feed rate of the sheath side 20%. Next, the obtained Taslan processed yarn was immersed in boiling water and subjected to wet heat treatment, and then dewatered and dried to obtain a bulky yarn of the present invention. The surface of the obtained bulky yarn is 100
Observation using a magnifying glass of × 2 shows that the regular polyester on the core side and the wet-heat-adhesive crimped filaments are aligned in parallel, and the sheath-side wet-heat-adhesive crimped filaments are entangled so as to wrap the core yarn. Was a bulky yarn appearing irregularly. Further, when observed using a scanning electron micrograph, it was confirmed that the wet heat-bonded crimped filament had a contact structure fused by its own crimp and had a complicatedly entangled network structure. .

Example 2 After the false twisted yarn used in Example 1 was converged by a predetermined amount, it was cut to obtain crimped staple yarns having cut lengths of 51 mm, 64 mm, and 127 mm. After mixing at a ratio of 30% by mass of crimped staple yarn having a cut length of 51 mm, 30% by mass of crimped staple yarn having a cut length of 64 mm, and 40% by mass of crimped staple yarn having a cut length of 127 mm, the bristle count is 1/7 through the carding process. Prepared sliver. The obtained sliver was run while immersed in hot water, and then immersed in a cold water bath to be cooled. Furthermore, it was dehydrated and dried with cold air and wound up to obtain a bulky yarn of the present invention. Observation of the surface and the cross section of the obtained bulky yarn with a magnifying glass of 100 times confirmed that the surface portion was bonded by fusion between the wet-heat-adhesive crimped fibers and had a fine network structure. did it. Further, it was confirmed that the cross-sectional structure also had a minute pore structure.

Example 3 The Taslan processed yarn prepared in Example 1 was knitted as pile yarn of a 10 gauge sinker pile circular knitted fabric. As the ground yarn, a 333 dtex / 72 filament polyethylene terephthalate false twisted yarn was used. The obtained pile knitted fabric is immersed in warm water of 60 ° C. and irradiated with microwaves, at 2450 MHz and 1 kW until bubbles are generated.
And then cooled, dehydrated and dried to obtain the knitted fabric of the present invention. Observation of the pile portion of the obtained knitted fabric and the back surface on which the pile yarn was knitted by a scanning electron microscope photograph showed that the pile portion was subjected to wet heat treatment with a high degree of freedom as a yarn. The part where the polyethylene terephthalate yarn on the side and the wet heat adhesive crimped filament are aligned in parallel and the part where the wet heat adhesive crimped filament on the sheath side entangles the false twisted yarn on the core side appear irregularly. In addition, the crimped filaments having wet heat adhesion were fused at their contact portions by their own crimps, and had a complicatedly entangled network structure, as observed by scanning electron micrographs. On the other hand, the back surface was subjected to wet heat treatment in a state of being constrained as a knit loop, so that fusion occurred between the loops, and the knitted fabric was free from laddering.

Comparative Example 1 Flor M as an adhesive filament having no crimp
111dtex / 12 filament (Polyamide low melting point multifilament type 1000 made by Unitika)
2 on the sheath side and regular polyester 167dtex
One false twisted yarn is distributed on the core side, and the air pressure is 3.0 kg /.
The taslan processing was performed by setting the feed rate on the sheath side to 20% in cm ² . Next, the obtained Taslan textured yarn was immersed in boiling water and subjected to wet heat treatment, and then dewatered and dried to obtain a textured yarn.The textured yarn obtained was rigid and had a candy-like melt on the surface. Was attached.

[0028]

According to the present invention, a fine network structure is formed in the structure of the bulky yarn, and this network structure is formed not only on the surface of the bulky yarn but also in the cross-sectional direction, and is effective for heat retention and water retention. A bulky yarn having a structure can be obtained.

[Brief description of the drawings]

FIG. 1 is an enlarged schematic view of a bulky yarn of the present invention obtained by using Taslan processing.

FIG. 2 is an enlarged schematic view of a bulky yarn of the present invention obtained by utilizing a spinning process.

[Explanation of symbols]

 1: crimped fiber with wet heat adhesion 2: regular polyester raw silk 3: loop 4: fused part 5: mesh structure

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D04B 21/00 D04B 21/00 B

Claims (3)

[Claims] 1. A bulky yarn containing 20% by mass or more of a wet-heat-adhesive crimped fiber, wherein at least a part of a fiber constituting the bulky yarn is thermally bonded by the adhesive crimped fiber,
A bulky yarn having a network structure on the surface of the bulky yarn. 2. The bulky yarn according to claim 1, wherein the wet-heat-adhesive crimped fiber is a fiber in which an ethylene-vinyl alcohol copolymer is present on at least a part of the fiber surface. 3. A woven or knitted fabric comprising the bulky yarn according to claim 1.