JP2000248443A - Plush woven or knitted stuff, and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain plush woven or knitted stuff, soft, bulky, and highly repulsive, by jetting high-pressure columnar fluid streams onto woven or knitted stuff of solvent-spun cellulosic fibers, and rubbing the stuff. SOLUTION: This plush woven or knitted stuff covered with fibrils is obtained by jetting high-pressure (20 to 150 kg/cm2) columnar fluid streams onto woven or knitted stuff of solvent-spun cellulosic fibers with an amine oxide-based solvent (e.g. N-methylmorpholine-N-oxide), and then rubbing the stuff, preferably using a machine (e.g. the one rubbing the stuff with liquid streams), to fibrillate the cellulosic fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nap having a unique appearance in which fibrils of solvent-spun cellulose fibers are densely formed in a woven or knitted fabric on the surface of a woven or knitted fabric, and a soft and bulky nap having a texture excellent in resilience. The present invention relates to a knitted fabric and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, in order to obtain a suede-like or micro-powder-like elegant appearance, brushing is performed. For example, Japanese Unexamined Patent Publication (Kokai) No. 54-68461 discloses a method for producing a suede-like raised woven fabric in which a woven or knitted fabric using a polyester multifilament made of a monofilament having an average fineness of less than 0.8 d is subjected to a raising process to impart a polymer elastic body. A method is described. Since the suede-like knitted fabric using such ultrafine fibers expresses the ultrafine fibers by splitting or dissolving, it is difficult to further develop fibers finer than the expressed fineness of the ultrafine fibers. Therefore, there is a problem that the strength is greatly reduced.

[0003] A method has been practiced in which a cloth is subjected to a friction / rubbing treatment under a wet condition using a liquid flow dyeing machine, an airflow dyeing machine, an airflow type texture processing machine, a washer or the like to generate fibrils on the surface of the cloth. In this method, since the cloth collides with or rubs against the tubular body, there is a problem that threads and wrinkles are easily generated, and it takes time to generate fibrils.

[0004] As a method of injecting a high-pressure water flow to apply a pattern to a fabric, for example, Japanese Patent Application Laid-Open No. 7-97765 discloses a method.
A method is described in which a high-pressure water stream is jetted onto the surface of a knitted fabric made of short fibers to generate a fibril or fluff on the surface of the knitted fabric and give a pattern to the fibril or fluff. Since the fibers are upright and are not entangled in a net shape, there is a problem that they are not bulky and have poor resilience.

[0005]

SUMMARY OF THE INVENTION The present inventor has made in view of such a situation, and has a unique appearance in which fibrils of solvent-spun cellulose fibers are densely formed in a net-like manner on the surface of a woven or knitted fabric. It is an object of the present invention to provide a raised woven knitted fabric having a soft, bulky, and excellent resilience texture.

[0006]

That is, the present invention is characterized in that in a woven or knitted fabric using solvent-spun cellulose fibers, the surface of the woven or knitted fabric is substantially covered with fibrils of the solvent-spun cellulose fibers. A high-pressure liquid columnar flow is sprayed onto the nap-knitted knitted fabric and the woven knitted fabric using the solvent-spun cellulose fibers to generate fibrils, and the surface of the woven or knitted fabric is substantially covered with fibrils of the solvent-spun cellulose fibers. A method of producing a nap-knitted knitted fabric characterized by the above, and a high-pressure liquid columnar stream is jetted onto the woven / knitted fabric using the solvent-spun cellulose fiber, and then subjected to kneading to generate fibrils, and the surface of the woven / knitted fabric is treated. The gist of the present invention is a method for producing a nap-finished knitted fabric, which is substantially covered with fibrils of a solvent-spun cellulose fiber.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The solvent-spun cellulose fiber used in the present invention is a fiber obtained by dissolving the cellulose material in an amine oxide-based solvent and spinning the same cellulose material as used in producing a conventional viscose rayon or the like. It is. The amine oxide solvent used here is N
-Methylmorpholine-N-oxide (NMMO),
N, N-dimethyl-ethanolamine-N-oxide (DMEAO), N, N-dimethylcyclohexylamine-N-oxide (DMCAO), N, N-dimethylbenzylamine-N-oxide (DMBAO), N-
Methyl-homopiperidine-N-oxide (NMHP
O), N, N, N-triethylamine-N-oxide (TEAO) and the like. Among them, NMM which is an excellent solvent for cellulose
It is preferable to use O.

In order to actually dissolve a cellulose raw material in an amine oxide solvent, a small amount of water is required. This water is for activating the cellulose raw material, and it is sufficient that the water is contained in the amine oxide solvent at 1.4 to 29% by weight. If the amount of water is too large, the cellulose raw material reacts with water, and the cellulose raw material becomes difficult to dissolve in the amine oxide solvent.

In general, a diluent is used in combination so that the amine oxide solvent and the cellulose raw material can be sufficiently mixed and sufficiently contacted. Examples of the diluent include isopropanol, butanol, toluene, xylene, N, N-dimethylformamide, N, N-dimethylacetamide,
Dimethyl sulfoxide, acetonitrile and the like can be used.

[0010] As described above, the cellulose raw material is dissolved in an amine oxide-based solvent and then spun by a predetermined method to obtain a solvent-spun cellulose fiber used in the present invention. As a spinning method, a method is used in which a spinning dope in which a cellulose raw material is dissolved in an amine oxide-based solvent is directly introduced into a spinning step to obtain a solvent-spun cellulose fiber. Further, after removing water and diluent from the spinning dope to obtain a chip containing an amine oxide solvent and a small amount of water, the chip is heated while being introduced into a spinning process to remove the solvent-spun cellulose fiber. The method of obtaining is also used.
The former method is called a direct dissolution method, and the latter method is called a precursor method. Generally, it is preferable to use the precursor method.

[0011] The solvent-spun cellulose fibers obtained through the spinning step are long fibers. Using this long fiber,
Yarn may be obtained or cut to short fibers (staple fibers)
After spinning, it may be spun and used as a spun yarn.

The woven or knitted fabric using the solvent-spun cellulose fiber of the present invention is a woven or knitted fabric using the above-described solvent-spun cellulose fiber alone, or a solvent-spun cellulose fiber and other fibers such as nylon, polyester, and the like. Natural fibers such as synthetic fibers such as acrylic, cotton, hemp, wool, silk,
It is a woven or knitted material in which regenerated cellulose fibers such as rayon, polynosic, cupra and the like are mixed. Examples of the blending method include blending, twisting, spinning twisting, weaving, and weaving, and any of these methods may be used.
Preferably, a solvent-spun cellulose fiber is exposed on the fiber surface, for example, a composite yarn having a core-in-sheath structure using a solvent-spun cellulose fiber for the sheath, or a solvent-spun cellulose fiber on the warp such that the solvent-spun cellulose fiber is exposed on the woven fabric surface. It is preferable to use a meridian using fibers. When the solvent-spun cellulose fiber is mixed with other fibers, the mixing ratio of the solvent-spun cellulose fiber is preferably 40% or more of the weight of the woven or knitted fabric. Is difficult to produce, and it is difficult to obtain the desired unique appearance and bulkiness.

In the present invention, a high-pressure liquid columnar stream is jetted onto a woven or knitted fabric using the above-mentioned solvent-spun cellulose fiber.
The high-pressure liquid columnar flow can be obtained by injecting a liquid such as water at a high pressure through an injection hole. The diameter of the injection hole is generally 0.05 to 1.0 mm, particularly 0.1 to 0.4 mm.
mm. The injection pressure is 20
A pressure of about 150 kg / cm ² is employed. When the injection pressure is less than 20 kg / cm ² , it becomes difficult to generate fibrils from the surface of the woven or knitted fabric. Injection pressure is 150k
If it exceeds g / cm ² , fibrils generated from the surface of the woven or knitted fabric are easily cut, and may be scattered or flow out with the liquid. As the liquid, water or warm water is generally used because of its easy handling. When the high-pressure liquid columnar flow is jetted onto the woven or knitted fabric, the distance between the woven or knitted fabric and the injection hole is preferably about 1 to 15 cm. This distance is 15c
m, the energy of the high pressure liquid columnar flow decreases,
It becomes difficult to generate fibrils from the surface of the solvent-spun cellulose fiber. If the distance is less than 1 cm, the woven or knitted fabric may come into contact with the injection hole.

The high-pressure liquid columnar stream collides with the surface of the solvent-spun cellulose fiber in the yarns constituting the woven or knitted fabric, and generates fibrils on the surface of the solvent-spun cellulose fiber by the energy of the high-pressure liquid columnar stream. Fibrils used in the present invention, 0.01 to along the fiber axis direction
A fiber having a fiber diameter of several μm and separated and separated in a branched state. The fibrils produced by the impingement of the high pressure liquid columnar stream are more preferably for covering the woven or knitted surface substantially with fibrils of solvent-spun cellulose fibers,
The high-pressure liquid columnar flow is preferably injected so that the fibril formation weight is 20% or more based on the weight of the woven or knitted fabric. In the generated fibrils, the fibrils are entangled with each other in a net shape by the injection of the high-pressure liquid columnar flow.

Further, in order to impart a soft and resilient texture to the fiber woven or knitted fabric using the solvent-spun cellulose, the woven or knitted fabric to which the high-pressure liquid columnar flow is jetted may be subjected to a kneading process. The kneading process used here is, for example,
Using a washer, a liquid flow processing machine, an air flow processing machine, a tumble dryer, etc., friction is created between the woven or knitted fabric or the woven or knitted fabric and the processing machine, and the woven or knitted fabric is soft and resilient due to the kneading effect. Is given.

[0016]

According to the present invention, when a high-pressure liquid columnar flow is jetted onto a woven or knitted fabric using solvent-spun cellulose fibers, the high-pressure liquid columnar flow collides with the woven or knitted fabric, and the solvent-spun cellulose fibers are separated by an impact force to fibril. Is generated. Since the solvent-spun cellulose fiber used in the present invention has high crystallinity and high orientation, when a high-pressure liquid columnar stream is jetted to give a strong impact force, the crystallized portion is separated to generate fibrils. As described above, since fibrils of the solvent-spun cellulose fibers progress and microfibrils are generated, the surface of the woven or knitted fabric has a unique appearance covered with a net-like and dense fibril. In addition, the impact force when the high-pressure liquid columnar stream collides with the woven or knitted fabric also has the effect of hitting and kneading, so that the texture is soft, and the fibrils are entangled in a net by the high-pressure liquid columnar flow, so that bulkiness and repulsion are achieved. Also excellent in nature.

[0017]

EXAMPLES Next, the present invention will be described more specifically with reference to examples. The measurement and evaluation of performance in the examples were performed by the following methods. Appearance The appearance of the woven or knitted fabric was evaluated visually by the following three grades. ；: Fibrils are densely formed on the surface of the woven or knitted fabric. Δ: Fibrils are mottled on the surface of the woven or knitted fabric. ×: little fibril formation. Texture The softness, bulkiness, and resilience of the woven or knitted fabric were relatively evaluated in the following four stages by a sensory test by touch. A: Very excellent. ；: Excellent. Δ: Slightly insufficient. ×: Insufficient.

Example 1 About 1070 g of N-methylmorpholine-N-oxide (NMMO) having a water content of 26% and about 200 of isopropanol
and heated to 80 ° C. to disperse the NMMO,
An NMMO-isopropanol suspension is obtained. About 200 g of the pulverized wood pulp is added to this NMMO-isopropanol suspension, the wood pulp is swollen, and about 400 ml of isopropanol is further added. After 10 minutes, a part of isopropanol and water is dissolved at 60 ° C. in 0.1 ml. 09MPa
The mixture was removed under reduced pressure under the conditions described above to obtain a cellulose / amine oxide precursor containing 6% of water, which was pulverized into chips. The tip was rotated by a single screw extruder at a screw rotation speed of 20 r. p. m.
And heated to 120 ° C., and the internal pressure was 140 to 210
The fiber was kept at kg / cm ² and spun from a 0.25 mm spinning hole. After spinning, water is supplied to the surface of the spun fiber while stretching about 25 times, and the spun fiber is stretched while solidifying.
It was introduced into a water bath at 20 ° C. to regenerate the cellulose fibers. Then, it was washed with water and dried, and cut into a fiber length of about 38 mm to obtain a solvent-spun cellulose short fiber having a fineness of 0.17 Tex. This staple fiber is spun to produce a spun yarn of 30th count, and the warp density is 132 yarns / inch and the weft density is 80 yarns / inch.
The twill fabric having the twill structure of No. 1 was woven, and desizing and scouring were performed while stirring for 1 hour in a 90 ° C. bath containing 0.2% heat-resistant amylase enzyme. The hole diameter is 0.127mm and the number of holes is 20 /
The fabric was placed on a net running at a speed of 2 m / min using a honeycomb spunlace facility having 10 rows of injection holes of 10 cm in parallel, and formed into a water column at an injection pressure of 70 kg / cm ^2. The stream was injected into the fabric to produce fibrils. Next, the woven fabric in which the fibrils were formed was dyed with a reactive dye using a jet dyeing machine, then impregnated with a 0.5% solution of an aminosilicone softener, and dried to obtain a processed woven fabric of Example 1.

Example 2 The same twill fabric as in Example 1 was subjected to high-pressure water columnar treatment and dyeing under the same conditions as in Example 1. Next, the woven fabric was put into a tumble dryer and kneaded at 80 ° C. for 40 minutes to obtain a processed woven fabric of Example 2.

Comparative Example 1 The same twill fabric as in Example 1 was placed on a net running at a speed of 10 m / min, and a water columnar stream was jetted onto the fabric at an injection pressure of 20 kg / cm ^2. The treatment was performed in exactly the same manner as in Example 1 to obtain a processed fabric of Comparative Example 1.

Comparative Example 2 Sea-island type fiber (total denier 11) having 90d / 24f polyester multifilament as the warp, polystyrene as the weft, and polyethylene terephthalate as the island component.
0d, 24 filaments, 80/20 sea-island ratio, 4 islands
33, single yarn denier 0.002d extra fine fiber)
Except for using a twill fabric having a 2/1 twill structure with a warp density of 132 yarns / inch and a weft yarn density of 80 yarns / inch, processing was performed in exactly the same manner as in Example 1 to obtain a processed fabric of Comparative Example 2. . The performances of the present invention and the processed fabric for comparison were measured and evaluated, and the results are shown in Table 1.

[0022]

[Table 1]

As apparent from Table 1, the woven fabrics of Examples 1 and 2 have a unique appearance in which fibrils are densely formed on the surface of the woven fabric, have a soft texture, are bulky, and have a repulsive feeling. Was excellent. The woven fabric of Comparative Example 1 was slightly insufficient in both softness, bulkiness, and resilience, and fibrils were only scattered on the woven fabric surface. The woven fabric of Comparative Example 2 had little generation of fibrils, and was insufficient in all of softness, bulkiness and resilience.

[0024]

According to the present invention, a unique appearance in which fibrils of solvent-spun cellulose fibers are densely formed in a woven or knitted fabric on the surface of a woven or knitted fabric, and a raised woven fabric having a soft, bulky and excellent resilience texture. A knit can be provided.

Claims (3)

[Claims] 1. A nap and knit fabric comprising solvent-spun cellulose fibers, wherein the surface of the woven or knitted fabric is substantially covered with fibrils of the solvent-spun cellulose fibers. 2. A fibril is generated by injecting a high-pressure liquid columnar flow onto a woven or knitted fabric using solvent-spun cellulose fibers, and the surface of the woven or knitted fabric is substantially covered with fibrils of the solvent-spun cellulose fibers. A method for producing a raised knitted knitted fabric. 3. A woven or knitted fabric made of a solvent-spun cellulose fiber is sprayed with a high-pressure liquid columnar flow, and then subjected to kneading to produce fibrils. A method for producing a nap-toned knitted fabric characterized by covering with a fibril.