JPH1072764A - Cotton spun lace nonwoven cloth having improved water resistance and soft and short hair-like napping and its processed product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject lightweight nonwoven cloth, easily removable of dirt, having excellent wash resistance and useful for clothing, etc., by napping a specific cotton spun lace nonwoven cloth under a specific condition. SOLUTION: This cotton spun lace nonwoven cloth is obtained as follows. A web is formed with cotton fibers and interlaced in a high-pressure water stream to obtain cotton spun lace nonwoven cloth having 0.50 mm thickness, 100gem<2> fabric weight and 0.018g/cc bulk specific gravity, each having a minimum value. Then, the nonwoven cloth is dipped in a polymer compositional solution to make the nonwoven cloth have increased water resistance and strength, and a weight fraction of attached solid content after drying to the nonwoven cloth is made within the range of 3-10%, thus swelling of the cotton fibers to water is suppressed, interlacing of the fibers are kept and dimensional stability to water is improved. The resultant nonwoven cloth is subjected to a wet rubbing process such as water stream rubbing by a jet dyeing machine or stir-rubbing, etc., by a wince, etc., by using normal temperature water or heated water, and further, subjected to a dry rubbing process by a tumbler or a rubbing machine, etc., in dried state or after drying to make the nonwoven cloth be softened, then the surface is made to have short hair-like naps.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The textile sheet of the present invention is used for clothing such as blousons, coats and skirts, personal items such as hats, bags, gloves, footwear, cushions, upholstery, and wall coverings. The present invention relates to a field used as a material for stationery such as sheets for bedding, furniture, vehicles, book covers, underlays, cases, and the like.

[0002]

2. Description of the Related Art Conventional non-woven suede is a non-woven fabric using a synthetic fiber, which is processed by polymer, and its front and back are removed to make it a suede or to use it as a base material for artificial leather. These fluffs had excellent elasticity, but lacked natural feeling, were heavy, and lacked water absorption as a material.

[0003]

Problems to be Solved by the Invention The non-woven fabric has an uneven fuzz, has a natural feeling, is not very elastic,
The challenge is to make it relatively light, to have good water resistance, to have good resistance to washing, to easily remove dirt, and to make a nonwoven fabric.

[0004]

[Means for Solving the Problems] The thickness and weight of a cotton spunlace nonwoven fabric are specified, and impregnation or surface treatment using a polymer composition having good water resistance, or a combination of these processes, is carried out. The bonding strength was increased, and the fibers and their entanglements were loosened or relaxed by wet and dry kneading to make them softer, or to make them limp and fluffy.

[0005]

[Action] Cotton has better water absorption than synthetic fibers. About 30% of the cellulosic microfibrils in the secondary cell membrane are non-crystalline regions, where more moisture and / or water are absorbed than crystalline portions. When the cotton nonwoven fabric is immersed in the polymer composition liquid, the polymer composition liquid is absorbed inside the fiber and adheres to the outside as described above. When this is roll-drawn at an appropriate drawing ratio and depressurized, the thickness slightly returns to its original state, and the polymer composition liquid migrates from near the surface to the inside, and a large amount is retained inside. If the surface which has become slightly less adhered to the polymer composition liquid is printed with the polymer composition liquid using, for example, a gravure printing machine (hereinafter referred to as surface treatment), the entangled portions of the fibers will have a strong bonding strength. Become. This surface treatment can be performed by printing, spraying, impregnating, or the like. Even if these surface treatments are applied to those previously impregnated, it becomes difficult for the polymer composition liquid to penetrate into the interior. Therefore, although the degree of penetration into the inside is slightly higher than in gravure printing, the purpose of attaching a large amount of the polymer composition liquid to the surface can be achieved.
Looking at this as a cut surface of a spunlace nonwoven fabric processed product, there is a large amount of polymer impregnation in the inner core, a large amount of polymer adhesion on the surface, and a small amount of polymer adhesion between the inner core and the surface. In particular, the part is relaxed and softened by wet and dry kneading. In addition, in the case of surface treatment only, to suppress the swelling of the cotton fiber and maintain the entanglement, if the amount of polymer is slightly increased, the entanglement bonding force and water resistance of the fiber on the surface become strong, and the inside is not impregnated. Even if the fiber inside swells, the fiber does not come off, so it has good water resistance, and the inside relaxes, becomes soft, and becomes bulky. When washing in this state, the amorphous region of the microfibrils is occupied to some extent by the polymer composition,
Water absorption and swelling due to water penetration are reduced, and water resistance is improved. In addition, dirt is easily removed. For softening, for example, wet kneading using a water jet dyeing machine, or
Dry kneading using a kneader and a tumbler (a general rotating type and a tumbler that can process endlessly and continuously on a protruding structure), etc., acting as if by hand kneading, will cause the fiber bundles and the entangled portions of the fibers to become entangled. , Slightly "relaxed" or relaxed, the joint seemed to be partially detached,
It gives a slight volume feeling, the fibers become brushed, their lengths are irregular, and the density is uneven, leading to fluffing. Wet kneading or semi-wet kneading (during dry kneading, at the same time as pretreatment or kneading,
Water or heated water or steam treatment), the fiber-processed polymer absorbs water and enters a swelling state.
It will shift or loosen. Water in this case,
Alternatively, the higher the temperature, the more the
When the temperature exceeds the next transition point (glass transition point), the swelling and relaxation effects increase. The loosening and fluffing of the fibers themselves is effective when the fiber bundles are loosened or dislodged. Therefore, vegetable fiber cotton is good, and in the case of synthetic fiber monofilament, it does not loosen, and the fiber between fibers does not loosen. It's just a phenomenon. In the processing described above, the touch becomes soft touch, and the rigidity, in other words, the "waist" becomes weak, giving a natural feeling unlike the uniform one mechanically processed using a brushing machine or sanding machine. It will be. In the case of gravure coating in surface processing, the surface treatment liquid adheres to the spunlace non-woven fabric in a point-like manner,
It is effective to make it fluffy. When the polymer is impregnated, it often adheres more to the inner core than to the surface, and the surface is liable to fluff. In the case of double-sided treatment, the adhesion of the polymer increases near the surface and the polymer impregnation occurs inside. To a small extent, the non-adhered part is well relaxed and loosened by wet and dry kneading, and the overall height is increased.

[0006]

[Implementation example] 150 g / ^{m 2} spun lace nonwoven fabric (e.g., Nisshinbo Industries Co., Ltd., PL2150) as substrate, acryl Emar Ji (Futaka Gosei Co., Ltd., VS Esudain DF683, solid 45% for mold, 100
% Modulus (6.3 Kg / cm ² ), melamine resin (Sumidex M-3, manufactured by Sumitomo Chemical Co., Ltd.)
5%, and this is diluted with water to a solid content of 5% to form an acrylic composition liquid, and the base material is immersed in the liquid to impregnate it.
This is drawn and the drawing ratio is set to 60%.
Dry with hot air and cure at 160 ° C for 40 seconds. Next, a solvent-type acrylic surface treating agent (Luxkin 301, manufactured by Seiko Kasei Co., Ltd.) is printed on both front and back surfaces using a 120 mesh grid pattern gravure roll, and a composition liquid of about 15 g / m ² is applied. Let it dry. Next, using a liquid jet dyeing machine, the water temperature or dyeing bath temperature is adjusted to 80 ° to 90 ° C., and the mixture is treated for about 20 minutes and dried. This is softened by performing a kneading process by using a kneading machine (for example, Japanese Patent Publication No. 59-6953) that operates like a hand kneading. Note that the kneading may be performed in a step before the surface treatment. In this case, the pre-processed or pre-processed spunlaced nonwoven fabric that has been polymer-processed and surface-processed is treated with water,
Warm water or steam may be applied, or while being applied, rubbing may be performed with the above-described rubbing machine, followed by drying and cooling. This is like a combination of wet and dry kneading, and can be called quasi-wet kneading.

The above is an example of the embodiment,
Regarding the processing step, the kneading process may be performed before the surface treatment process, the liquid jet dyeing process may be performed also as a flexible process, or may be performed before or after the dry kneading process. Good. In addition, polymer processing is performed on cotton spunlace non-woven fabric, and wet kneading is performed.
If the raw material is connected (joined) or sewn to produce a product, and then dried in a tumbler, hot air will be generated between the fibers, creating a volume feeling, resulting in a light and soft finish. The fluff at the sewn area is slightly different from other wide areas, but is natural.

As the composition impregnating solution for the substrate, the coating solution, or the surface treatment solution, various water-soluble, emulsion, or solvent-type polymers and their additives are used. The higher the molecular weight of the polymer, the better. For non-woven fabrics, stretched fibers as constituent materials have a wide polymer crystal domain, and synthetic fibers with poor hydrophilicity are unsuitable.
The material is preferably cotton as described in the action section. Spunlace should be entangled not only on one side but also on both sides and the water pressure should be increased gradually to improve strength and surface quality. Also, the weight is preferably 100 g / m ² or more. If the weight is less than 100 g / m ² , it is difficult to control an appropriate range of the drawing and surface treatment of the impregnating liquid, and it is difficult to obtain a desired one in terms of feel and flexibility. For fluffing, the fiber length should be 15-35.
When a lot of about mm is used, the short-haired fluff is increased, unlike the fluff when it is longer,
The short hair had a more "grainy feeling" to the touch, and the long hair showed a little difference in the "roughness" when it was long. As the impregnating liquid, thermoplastic polymers and their copolymers, such as those used for polymer processing of fibers such as acrylic, vinyl acetate, polyurethane, and polyamide, can be used, and a thermosetting polymer is a crosslinking agent or Can be used as a curing agent.
As for the various additives, general additives for fiber processing can be used as in the case of the polymer. Antibacterial deodorants, insect repellents, and other functional materials can be mixed with the polymer before use. The use concentration of the composition liquid is preferably in the range of 3% to 10%. If the concentration is high, it will be difficult to penetrate into the cotton microfibrils, and it will be easy to adhere to the surface of the fiber, making it difficult to perform appropriate impregnation. Quality products cannot be obtained.
The coating liquid or the surface treatment liquid can be used even if the concentration and viscosity of the impregnating liquid are adjusted, but a surface treatment agent having a suitable gravure coating and a printing ink can also be used. The viscosity is about 100 to 600 centipoise, and depending on the type, it can be used up to about 1500 centipoise. If this processing condition is met, the concentration is usually about 5% to 15% in a solvent system and up to about 50% in an emulsion. For the surface treatment, a gravure type printing machine is usually used, but the coating amount is 5 g / cm ² to 30 g / cm ^2.
Is appropriate. For surface treatment, printing, spraying, impregnation, etc. can be used in addition to printing. If coating or surface treatment is also expected to impregnate the polymer solution with non-woven fabric, a continuous process is applied to increase the amount of polymer, but the one with a relatively low viscosity is used at first. To do. This processing method provides a supplementary effect when the prior impregnation processing is omitted or when the impregnation amount is small. However, when the adhesion amount of the polymer is 30 g / cm ² or more, a film is formed or rigidity is increased, and the product is not suitable for the intended use.
As for the flexible processing, in addition to the examples shown in the dry method, tumblers (normal batch type and endless type continuous type
Tumbler T150 (manufactured by Fies, Germany) can be used, and a liquid dyeing machine, a washing machine, a vibrowasher, and the like can be used in a wet system. The tumbler has a combined effect of drying, softening, fluffing, and giving a sense of volume.

[0009]

By specifying a fiber material, the effect of impregnation or surface treatment with a polymer composition liquid can be enhanced, and fluffing and softening can be achieved by wet and dry kneading. As a processed body, it is a fiber processed body of a cotton spunlace nonwoven fabric which does not swell and separate, has excellent water resistance, is excellent in suitability to be washed, and has high flexibility, as a fibrous structure by water absorption.

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Claims (5)

[Claims] 1. A web is formed from cotton fibers, entangled with a high-pressure water stream, and has a thickness of 0.50 mm and a unit weight of 100 g /
A cotton spunlace nonwoven fabric having a minimum value of m ² and a bulk density of 0.018 g / cc is immersed and impregnated in a polymer composition liquid that provides water resistance and strength reinforcement. The weight ratio is set in the range of 3% to 10% to suppress the swelling of the cotton fiber with water, maintain the entanglement of the fiber, increase the bonding strength, and improve the dimensional stability of water resistance. Using heated water, wet kneading such as water jet kneading with a liquid jet dyeing machine or stirring kneading with a win etc., or kneading at the same time as dyeing, and further drying at or after drying with a tumbler or kneader A cotton spunlace nonwoven fabric which has been softened by softening and has a short fuzzy fluff on its surface, and has improved water resistance, and a processed product thereof. 2. A cotton spunlace nonwoven fabric is immersed and impregnated in a polymer composition solution, dried and then impregnated or subjected to surface treatment such as coating, printing and printing on both front and back surfaces to improve water resistance, and to improve the water resistance. Claims that reduce swelling, improve mechanical strength, perform wet and dry rubbing at least once each, and make smooth, fine and very short and fluffy fluff. 2. A soft, short-haired, fluffy cotton spunlace nonwoven fabric having improved water resistance according to claim 1, and a processed product thereof. 3. A cotton spunlace non-woven fabric,
Perform coating, printing, printing, etc. using the polymer composition liquid to improve the water resistance, improve the mechanical strength, and improve the wet and dry kneading processes by at least suppressing the swelling of the cotton fibers on both sides. Each one or more times to soften, and in the thickness direction, loosen the degree of adhesion between the internal fibers and fibers, and the thickness is raised to a height of 10% to 50% of the original thickness. A soft, short-haired, fluffy cotton spunlace nonwoven fabric having improved water resistance and a processed product thereof. 4. A dry kneading process is performed in a pre-process or a post-process of impregnating, coating, spraying, printing, printing, etc., a cotton spunlace nonwoven fabric with a polymer composition solution, and the thickness is reduced from 10% in thickness. Raised in the range of 50%, softened by wet-rubbing and dry-rubbing, and softened to give a soft, short-haired fluff with improved water resistance characterized by a 20-70% bulk rise. Cotton spunlace nonwoven fabric and its processed products. 5. A cotton spunlace nonwoven fabric is polymer-processed, wet-kneaded, and then the raw material is contacted or sewn, and then dry-kneaded in that state or wet. A soft, spun, fluffy cotton spunlace nonwoven fabric having improved water resistance, and a processed product thereof.