JPH09188972A - Silk processed non-woven fabric and silk processing method for non-woven fabric - Google Patents

Abstract

(57) [Summary] [Object] To provide a novel silk-processed non-woven fabric having characteristics of silk, a silk-processing method for the non-woven fabric, and a new paper diaper using the silk-processed non-woven fabric. [Structure] A non-woven fabric made of at least one of pulp, rayon, polypropylene, polyethylene, polyester, and polyamide fibers, which is silk-coated to adsorb a fibroin protein solution extracted by removing sericin from silkworm cocoons. A silk-processed non-woven fabric characterized by being subjected to.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silk-processed non-woven fabric obtained by imparting excellent characteristics of silk (texture, breathability, etc.) to a non-woven fabric such as synthetic fibers such as pulp and polyester, and a processing method thereof. Thus, it is used in a product field in which the human skin is directly touched, such as a tissue using the non-woven fabric itself or a paper diaper using the non-woven fabric.

[0002]

2. Description of the Related Art Pulp, rayon, polypropylene, polyethylene, polyester, polyamide (nylon) fibers, etc. have been conventionally used as materials for direct contact with human skin such as tissues, makeup puffs, sanitary products and linings for paper diapers. Non-woven fabric with a soft texture is often used.

On the other hand, silk has been used as a high-class woven fabric since ancient times as a king of fibers, but it is extremely superior to other natural fibers such as cotton, wool, and hemp, and to the synthetic fibers. Because of its high price, its use was limited to high-class outerwear.

Recently, however, it has been reassessed that silk is not only beautiful in appearance and good in touch, but also excellent in breathability, moisturizing property and moisture releasing property necessary for protecting health, and is extremely hygienic. Has been.

Further, unlike synthetic fibers, it has the property that it is not electrically charged and it does not burn easily.

However, products made of silk have been diversified in abundance recently, and have dramatically spread to clothing such as underwear, interiors such as curtains and wallpapers, cosmetics such as powder and cream, and various materials. It has been used.

[0007]

In the conventional non-woven fabrics, synthetic fibers such as polyester, which is low in cost, are used for most of the non-woven fabrics on the assumption that they are consumed in large quantities, except for the rather expensive pulp.

However, although synthetic fibers have various advantages, they generally have poor hygroscopicity and are liable to generate static electricity and are prone to insects and molds.

When used as a paper diaper, it does not feel as good as silk even though it feels good to the touch, and when worn for a long time, it often accompanies a sensitive baby or elderly caregiver with itchiness, itchy skin, and bed sores.

As described above, the synthetic fiber non-woven fabric does not reach the excellent function of silk in terms of health and hygiene.

The present invention has been made in view of the need for further improvement of products such as paper diapers using the above-mentioned non-woven fabric, and the fibroin protein extracted from silkworm cocoons is adsorbed on the fiber surface of the non-woven fabric. Accordingly, the present invention provides a silk-processed non-woven fabric and a processing method thereof, which impart characteristics such as softer touch and hygroscopicity which are not present in conventional non-woven fabrics.

[0012]

The present invention provides (1) a non-woven fabric made of at least one of pulp, rayon, polypropylene, polyethylene, polyester, and polyamide fibers, from which sericin is removed from silkworm cocoons. The above object is achieved by providing a silk-processed non-woven fabric characterized by being subjected to silk-coating for adsorption-coating the fibroin protein solution extracted by.

(2) In addition, a fibroin protein solution obtained by scouring silkworm cocoons to remove sericin or extracting the solution with 2
Put a non-woven fabric made of at least one of pulp, rayon, polypropylene, polyethylene, polyester, and polyamide fibers in a 5 to 50% solution diluted with warm water at 0 to 80 ° C and soak for 1 to 20 minutes. The above-mentioned object is achieved by providing a method for silk-processing a non-woven fabric, characterized by adsorbing fibroin protein on the fiber surface of the non-woven fabric after drying.

(3) Alternatively, a fibroin protein solution extracted by scouring silkworm cocoons to remove sericin or a 5 to 50% solution obtained by diluting the fibroin protein solution with warm water at 20 to 80 ° C., pulp, rayon, polypropylene, To provide a silk processing method for a non-woven fabric, characterized in that a non-woven fabric made of at least one of polyethylene, polyester and polyamide fibers is spray-irradiated by a sprayer to be adsorbed on the fiber surface of the non-woven fabric and then dried. The above-mentioned problems are achieved.

(4) Furthermore, the silk-processed nonwoven fabric according to (1) above, which is cut into a substantially rectangular shape and is provided with bellows-like uneven wrinkles near both ends in the longitudinal direction, is used for the lining of a paper diaper. The above-mentioned problems are achieved by providing a silk-processed diaper that does.

Here, the silkworm cocoon is a so-called silkworm cocoon of the silkworm family.

[0017]

In the present invention, the raw silk taken from silkworm cocoons is refined to remove sericin and the extracted fibroin protein is adsorbed on the non-woven fabric, so that the soft touch, breathability and moisture retention characteristic of silk are obtained. , Hygroscopicity, absorbency, deodorant function and other health and hygiene effects can be obtained, and static electricity can be prevented.

The fibroin protein consists of more than a dozen amino acids, especially glycine (about 43%) and alanine (about 31%).
%) Is contained, and conversely, there are few acidic and basic amino acids, etc., so that a film having a minute structure with little hygroscopicity is formed. Further, the content of highly hydrophilic serine is 10%, which is much higher than that of other protein hydrolysates, and has a water retaining action (moisturizing feeling).

In the silk processing method, the non-woven fabric is put in the extracted fibroin protein solution or a 5-50% solution prepared by diluting the fibroin protein solution with warm water at 20-80 ° C., immersing it for 1-20 minutes, and then drying it. The fibroin protein can be sufficiently adsorbed to the inner fibers of the non-woven fabric.

The extracted fibroin protein solution or a 5 to 50% solution obtained by diluting it with warm water at 20 to 80 ° C.
In the silk processing method in which the non-woven fabric is spray-irradiated with a sprayer to be adsorbed on the non-woven fabric surface and then dried, the fibroin protein can be adsorbed on the non-woven fabric surface in a short time of several seconds, which results in quick drying and mass production. Suitable.

[0021] When the silk non-woven fabric of the present invention is used for the inner lining that directly touches the skin of a disposable diaper used for babies and elderly care workers, it has excellent breathing and moisturizing properties of silk and is free from itchiness and itching, resulting in an extremely excellent health and hygiene effect. To be

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the silk-processed nonwoven fabric of the present invention, the silk-processing method for the nonwoven fabric, and a disposable diaper using the nonwoven fabric will be described in detail below.

A feature of the present invention is that a conventional non-woven fabric made of at least one of pulp, rayon, polypropylene, polyethylene, polyester and polyamide fibers is prepared by removing sericin from raw silk obtained from silkworm cocoons. The extracted fibroin protein solution is subjected to silk coating for adsorption coating to give the characteristic of silk which is not present in the nonwoven fabric (claim 1).

The above pulp, rayon, polypropylene,
Polyethylene, polyester, polyamide (nylon)
The system fiber is a typical fiber as a non-woven fabric, and is mass-produced.

Originally, silk as a high-grade garment material is generally dried (dry cocoon) of silkworm cocoon, and the sericin, which fixes the cocoon thread like glue, is swollen and softened by steam, hot water or a chemical agent to loosen the cocoon thread. It is made easier (boiled cocoon) and the raw silk that is rolled up is used as the raw material.

The cross section of the raw silk has a structure in which two triangular fibroins are wrapped in sericin, and fibroin accounts for 72 to 81% and sericin for 19 to 28%.

Sericin is prepared by scouring the above-mentioned raw silk with Marcel soap solution or a weak alkali such as sodium carbonate, sodium silicate, etc. near the boiling point (alkali scouring) or enzyme scouring using an enzyme such as alcalase. When dissolved and removed, the raw silk turns into two fibroins and becomes a silk kneaded silk with a unique luster.

The fibroin protein solution extracted by removing the intermolecular cross-linking structure of fibroin, which is a fibrous protein from which sericin has been removed, consists of a dozen or more amino acids, and in particular glycine (about 43%) and alanine (about 31%). Since it is contained in a large amount and, conversely, contains few acidic or basic amino acids, it forms a film having a minute structure with little hygroscopicity. Further, the content of highly hydrophilic serine is 10%, which is much higher than that of other protein hydrolysates, and has a water retaining action (moisturizing feeling).

The above fibroin protein solution can be prepared, for example, by pulverizing fibroin into fine powder and dissolving it in an aqueous solution in which sericin is dissolved (the sericin removed by boiling cocoon or scouring can be used). It may be prepared by dissolving in a synthetic resin solvent.

The above-mentioned non-woven fabric was put in a stock solution of this fibroin protein solution or a 5-50% solution diluted with warm water of 20-80 ° C., immersed for 1-20 minutes, and then dried. The fibroin protein is adsorbed and stabilized on the fiber surface (including not only the entire surface layer but also the inner fiber surface) (this series of steps is called silk processing).

Next, in the above-mentioned non-woven fabric silk processing method, the non-woven fabric was directly immersed in the fibroin protein solution to be adsorbed, but as another adsorption method, the fiber surface of the non-woven fabric is sprayed and irradiated with a sprayer. Silk processing is also possible by a method of drying after adsorption.

In this case, generally, when the non-woven fabric is dense and thick, it is only adsorbed on the surface layer, but it can be adsorbed in a short time and is suitable for silk processing production of a large amount of non-woven fabric. This will be sufficient for products where emphasis is placed.

As described above, the silk processing of the nonwoven fabric of the present invention is a simple means of adsorbing fibroin on the surface of the nonwoven fabric made of pulp or synthetic fiber, and the same effect as that of genuine silk can be obtained. However, the amount of fibroin to be used is small because it is only adsorbed on the surface of the non-woven fiber, so the cost can be very low.

The silk-processed non-woven fabric is cut into a substantially rectangular shape, and bellows-like uneven wrinkles are provided near both ends in the longitudinal direction to directly touch the skin. Silk-processed diaper used for the lining of a paper diaper (for babies, elderly people for nursing care) ), You can get the soft touch peculiar to silk, which is not found in conventional paper diapers, reduce the stuffiness and bulkiness, and get the deodorant function to take off the odor. Needless to say, various health and hygiene effects of relieving the chills of sleep and providing deep sleep can be expected.

[0035]

The silk-processed nonwoven fabric and the method for silk-processing a nonwoven fabric according to the present invention have the following effects.

(1) It has an excellent effect that a non-woven fabric having a silk texture and characteristics can be produced at low cost.

(2) It has an excellent effect that the conventional disposable diaper is provided with the characteristics of silk such as breathability, moisturizing property, heat retaining property, and the property of silk that static electricity is not generated and the effect on health and hygiene.

Claims (4)

[Claims] 1. A non-woven fabric made of at least one of pulp, rayon, polypropylene, polyethylene, polyester, and polyamide fibers, which is subjected to adsorption coating with a fibroin protein solution obtained by removing sericin from silkworm cocoons. A silk-processed non-woven fabric characterized by being silk-processed. 2. A fibroin protein solution obtained by scouring silkworm cocoons to remove sericin or extracting the solution, or 20 to 80 ° C.
In a 5-50% solution diluted with warm water, pulp, rayon, polypropylene, polyethylene, polyester,
A method for silk-processing a non-woven fabric, which comprises placing a non-woven fabric made of at least one polyamide-based fiber as a material, immersing it for 1 to 20 minutes, and then drying it to adsorb fibroin protein on the fiber surface of the non-woven fabric. 3. A fibroin protein solution obtained by scouring silkworm cocoons to remove sericin or extracting the solution, or 20 to 80 ° C.
A 5 to 50% solution diluted with warm water is spray-irradiated with a sprayer onto a non-woven fabric made of at least one of pulp, rayon, polypropylene, polyethylene, polyester, and polyamide fibers to be adsorbed on the fiber surface of the non-woven fabric. A method for processing silk of a non-woven fabric, which comprises drying after drying. 4. A silk-processed diaper, characterized in that the silk-processed nonwoven fabric according to claim 1, which is cut into a substantially rectangular shape and has bellows-shaped concave and convex wrinkles near both ends in the longitudinal direction, is used as a lining for a paper diaper. .