JPH0813304A - Mixed nonwoven fabric comprising chitin fiber and silk fiber - Google Patents

Abstract

PURPOSE:To obtain the subject mixed nonwoven fabric more easily and stably (including product performance), at lower cost, in larger quantities, while making the best use of the characteristics of cottonlike chitin fibers and silk fibers. CONSTITUTION:Subordinate silk yarns (waste silk yarns from cocoons sorted off, rubbish produced in silk yarn manufacturing process, rubbish produced in silk yarn weaving process) are scoured to a half to 70% degree into floss silk, which is cut into short or medium fibers (or, various kinds of floss silk may be cut into such fibers). The fibers are subjected to alkali scouring or high-pressure scouring process followed by post-treatment such as neutralization and/or washing, and the resultant fibers are opened into finished silk fibers. A highly transparent chitin solution prepared by purification of chitin extracted from a crustacean is subjected to wet spinning followed by cutting into short or medium fibers (cottonlike chitin fibers). Next, the finished silk fibers and cottonlike chitin fibers are mutually homogeneously blended at the weight ratio of (10:90) to (90:10) to form a web as the objective mixed nonwoven fabric.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixed non-woven fabric of chitin fiber and silk fiber.

[0002]

BACKGROUND OF THE INVENTION Cotton-like chitin fiber is a component of the exoskeleton of crustaceans, and chitin, which is one of the mucopolysaccharides, is extracted from crustaceans such as red snow crab to give a highly transparent chitin solution. Is wet-spun and has a high mechanical strength,
Moreover, it is a product made into high purity chitin fiber and made into a cotton shape. For example, Besquitin W (trade name: manufactured by Unitika Ltd.) is known. The chitin fiber is a delicate fiber having a very low specific gravity, softness, and low tensile strength as compared with other fibers, and is colorless and odorless. In addition, it has very excellent properties, especially for severe burns, it suppresses the infiltration of inflammatory cells into the tissue around the wound site, and the uptake into granulation tissue is slight and the affinity with the living body is high. , Has an excellent track record in early healing of wounds, and of course, the Dermatological Society has achieved remarkable results in the treatment of severe burns at hospitals.

On the other hand, remarkable results have been shown in the treatment of bedsores of bedridden sick people, and it is an artificial fiber which has remarkably good results for skin disorders of various human bodies. At present, the characteristics of the fibers are light, thin, weak, and soft, and the main product is commercially available as a non-woven fabric by a wet process as a finished product.

Chitin fiber has been found useful as a wound skin protective material for burns, traumatic dermabrasion, etc. for analgesic effect, adhesiveness, water absorption, epidermal formation, granulation formation, etc. On the other hand, silk fiber is also a skin disorder. It has been recognized that it is excellent in hygroscopicity and heat retention as a protective material for skin such as burns and atopic dermatitis, etc.

As described above, although the cotton-like chitin fiber is very good for the skin damage of the human body, it is not very common, and the finished product is rarely exposed to the general public. The main reason is that the production cost of raw cotton is too high. Even if it is known that it will be cheaper if it is manufactured in a large amount, of course, because it uses special raw materials called crustaceans and it is made into a special product by a special manufacturing method, so the field of use is limited, It's not as easy as mass producing, consuming a lot, and lowering costs.

Recently, air pollution, increased stress, etc.
Allergic dermatitis (atopic dermatitis etc.), which is presumed to be the main cause, shows an increasing tendency.

[0007] Further, various obstacles to human skin such as bed sores of bedridden elderly people in a long-lived society also tend to increase.

[0008] On the other hand, in the field of silk, which is an ancient tradition of Japan and is an ancient tradition of Japan, it has been empirically proven that silk is effective against skin diseases, and various clinical experiments have been performed. What has been proven is a well-known fact.

[0009]

However, as far as the general public knows, chitin fiber is, of course, a silk fiber, and it must be an expensive product, and the price is about 3 to 5 times that of cotton products. The current situation is that there is a difference.

No matter how good the performance is, and the performance can be proved, if it is too expensive, the utility value will be reduced.

It is natural that a serious skin disorder that affects human life takes human life rather than cost, and it is natural to use high-purity chitin fiber products. Immediately, skin disorders that do not affect human life do not have effective countermeasures at present, but there are various problems such as secondary disorders such as steroids, bed sores of bedridden patients, atopic dermatitis, mild burns, etc. If left unattended, such as allergic dermatitis, there are many cases where it becomes nervous irritatingly, and it becomes more and more severe, and bed sores, etc. are not effective means in terms of cost, and it is socially significant. It's a problem.

Therefore, the present invention makes use of the characteristics of the cotton-like chitin fiber and silk fiber to the maximum, and is cheaper, larger in quantity, and more stable (including product performance) as compared with the conventional one.
It is an object of the present invention to provide a mixed non-woven fabric of chitin fiber and silk fiber that can be manufactured more easily.

[0013]

Means for Solving the Problems In order to achieve the above object, the present invention provides a method of sub-silk thread and the like (selection cocoons, scraps from the spinning process, scraps from the weaving process) to about half or seven minutes. Scouring to make cotton, or using various cotton, cut into short fiber to medium fiber, and after cutting, carry out alkali scouring or high pressure scouring, and post-treating such as neutralization and washing, and opening. A blending ratio of the silk fiber thus obtained and a cotton-like chitin fiber obtained by producing a highly transparent chitin solution purified from chitin extracted from crustaceans by wet spinning and cutting it into short fibers or medium fibers is 10: 90 to 90:10 is mixed substantially uniformly to form a web.

[0014]

The secondary silkworm thread (selected cocoons, scraps from the spinning process, scraps from the weaving process) cannot be used as they are. Also, various kinds of cotton are used. Since these cotton wool is made of long fibers, it is cut into short fibers or medium fibers to make the fiber length uniform, satisfy the web processing conditions, and facilitate the removal of impurities. After cutting, alkali scouring or high-pressure scouring is performed to remove sericin up to the third layer for removing impurities, increasing exposure, and sterilizing.
After that, wash, neutralize, dehydrate, open and completely dry,
Use silk fiber. By this final scouring, it becomes a fibroin fiber useful for the human body, and also has a bactericidal action, and becomes a material suitable for skin disorders. And by opening the fiber,
A silk fiber having a crimp and a fiber length suitable for producing a nonwoven fabric is obtained.

On the other hand, chitin is extracted from crustaceans, a chitin solution having a higher transparency than this chitin is purified, this is wet-spun to produce chitin fiber, and this is cut into short fibers or medium fibers. Manufacture cotton-like chitin fiber.

The thus obtained silk fibers and cotton-like chitin fibers are mixed substantially uniformly at a compounding ratio of 10:90 to 90:10 to form a web, and the crimps of the silk fibers produce the silk fibers. It is entangled with the cotton-like chitin fibers and does not require a binder at all, and a non-woven fabric can be easily obtained. In particular, silk fibers can improve the tensile strength of cotton-like chitin fibers, facilitate post-processing, increase flexibility, facilitate handling, and be reasonably priced.

When the content of the cotton-like chitin fibers is 10% or less, even if the cotton-like chitin fibers are sufficiently opened and mixed, it is difficult for the chitin fibers to appear on the surface of the nonwoven fabric, and there is no meaning of mixing the cotton-like chitin fibers. In addition, because too severe a skin disorder is usually treated in a hospital, the effect does not change much in ordinary households,
Cotton-like chitin fiber is 9 because it is easy to handle and cheap.
Mixing of 0% or more does not make sense in terms of cost. The mixing ratio of these silk fibers and cotton-like chitin fibers is 10:90.
Within the range of up to 90:10, it is appropriately selected depending on the application.

[0018]

EXAMPLES The present invention, as shown in FIG. 1, includes secondary silkworm threads, etc. (selection cocoons, scraps from the spinning process, scraps from the weaving process).
Is scoured (for example, alkali scouring) into a semi-kneading or a seven-minute kneading process, or cut into short or medium fibrous forms using various kinds of scouring (for example, preferably about 1 to 3 inches) However, other than this), and after cutting,
After performing alkali scouring or high-pressure scouring, post-treatment such as neutralization and washing, and opening silk fibers, and a highly transparent chitin solution purified from chitin extracted from crustaceans is produced by wet spinning. A blending ratio of cotton-like chitin fibers cut into short to medium fibers (fiber length of the same level as silk fibers) is 10:
90 to 90:10 is mixed substantially uniformly to form a web.

Since the cotton-like chitin fiber is a very delicate fiber, there is no problem in using raw cotton as it is, but it does not have appropriate strength, weight and crimp suitable for non-woven fabric. Therefore, conventionally, a wet type nonwoven fabric is somewhat difficult to bend and post-process, and its range of use and method of use have been limited in spite of having good characteristics.

By mixing with silk fibers as evenly as possible, the flexibility is increased and the finished non-woven fabric is easily subjected to various post-processing.

Therefore, a silk fiber raw material is produced in the following manner, and in consideration of the mixing ratio with the cotton-like chitin fiber depending on the degree of various skin disorders, the raw material of the mixed type nonwoven fabric is sufficiently opened by an opening machine. Then mix and mix the two fibers as evenly as possible.

Secondary silkworm threads (selected cocoons, scraps from the silk-making process, scraps from the weaving process) are alkali-scoured to a half-kneading or a seven-minute kneading to make them cotton-like, or by using various kinds of cotton, for example, , Cut into 1 to 3 inch square, and after cutting, to remove sericin up to the third layer, alkali scouring,
Alternatively, after high-pressure scouring, post-treatment such as neutralization and washing, the fibers are opened, and the opened silk fibers and the cotton-like chitin fibers are mixed in a mixing ratio of 10:90 to 90:10 to make them substantially uniform. Mix to form a web. Since the auxiliary silkworm thread and the like cannot be used as they are, they are first scoured with an alkali to a degree of half-kneading or seven-minute kneading, and made into a cotton-like shape. After making it into a cotton-like shape, it is cut into a size of 1 to 3 inches. After cutting, sericin is removed up to the third layer, and sodium hydroxide should be boiled and scoured for 10 to 20 minutes at a well-known water ratio to increase exposure, remove impurities, and sterilize again. , Wash with hot water, neutralize, or 1 for high pressure scouring
After scouring at 120 ° C. to 140 ° C. for 0 to 20 minutes, it is washed with water, dehydrated, opened, and completely dried to obtain the silk fiber raw material of the present invention. The reason why the secondary silkworm thread or the like is subjected to alkali scouring in about a half-kneading or a seven-minute kneading is that cocoons and raw silk waste are hard and cannot be loosened and cannot be processed into cotton. Further, if the secondary silkworm yarn or the like is suddenly subjected to the main kneading, dust and pupal waste remain in the fiber mass, and it becomes impossible to remove impurities.

On the other hand, in addition to the above-mentioned secondary silkworm thread and the like, various kinds of cotton and penny distributed in the market can be used. What is conventionally called "cotton cotton" in Japan is called "bukuro-cotton cotton" or "kaku-cotton cotton", and these are usually refined and sericin remains at about 3-5%. There is nothing wrong with that. In China, cotton is produced in the same way as in Japan. Depending on the type of selected cocoons and the type of waste generated in the spinning process, (a) Botan tile (b) Red tile (c) Green tile (d) ) It is sold and exported under the brand name of yellow tile, but both are made of cotton, and sericin is reduced by 20% from the weight of cocoon thread, and sericin is 3-5%.
It is a refined silk raw material that remains to some extent, so there is no problem in using these for shortening the process and reducing costs. Sub silkworm threads that do not become fluffy are also scoured, and in order to remove impurities, after being cocooned and opened (silk), they are fluffy when applied to a carding machine. In this case, be careful not to hang it on the carding machine. After that, it is cut into a size of 1 to 3 inches. Also, there is no problem in using semi-kneaded or seven-minute kneaded finely dried cotton (silk) as a raw material as it is, but in that case, when the finely dried cotton (silk) is scoured, it is too strong and polite There is no problem even if it is cut into 1 to 3 inch squares so that it does not comb.

Originally, when raw silk is scoured as it is, it has a feature that it fluffs, and fluff is because fibroin is fibrillated. By final scouring and alkaline scouring of each raw cotton material in the final short fiber state, not only impurities are removed, but also sericin is removed by a value close to 100%, and silk threads are formed in the process of increasing the degree of exposure. Fibroin fiber, one fibroin is made of 100 fibrils inside and outside, fibers of fibroin are entangled with each other, hitting each other, a part of fibroin is decomposed into fibrils, and is separated from the fibroin tissue,
It becomes a raw material suitable for forming a web having a delicate crimp. This phenomenon is that when a silkworm cocoons, it shakes its head in the shape of S or 8 to eject yarn. This curve is called a cocoon curve, and the cocoon curve appears on the yarn as a subtle crimp when the yarn is taken from the cocoon. In the present invention, this feature is utilized for forming a web. Therefore, it is only necessary to scouring and making cotton-like ones that easily become cotton, such as accessory silkworm threads, and to make cotton-like accessory silkworm threads that are difficult to make into cotton easily, use a carding machine that is too strong and polite. You have to avoid combing.
It should be limited to removing impurities, and if it is too strong, it may kill the crimp of the cocoon curve. Therefore, if it does not go to the refined cotton and becomes a fluffy cotton, it becomes a silk web raw material with no problem.

In most of the current facilities, it is impossible to process a non-woven fabric with straight fibers, and the more crimps, the better. By making the auxiliary silk thread, etc., into a cotton shape, cutting, and alkali scouring, Part of the silk thread becomes fibrillated, and a delicate crimp is pulled out from the silk material, making it easier to make a uniform web. It has been found that webs made of fibers with a high degree of crimp are very effective in maintaining the original structure in subsequent steps.

For various non-woven fabrics, a woolen machine has been conventionally used, and the technique of woolenness has been the center. The above-mentioned woolen machine and woolen technique are also used for manufacturing the nonwoven fabric of the present invention. For example, opening, blending, and opening of raw silk fiber are almost the same as the previous process of spinning, such as hopper, bale, breaker,
Hopper and mixer are suitable. At the time of opening, the silk raw material fiber thus treated is not in the form of a solid block, and the cotton-like shape is easily opened to the fiber stage, which makes it possible to keep the density of the silk fiber as constant as possible. A garnet machine or card can be used to guide the web formation.

Although the cut length of the silk short fiber raw material is set to about 1 to 3 inches, depending on the web processing method, if there is an extreme difference in fiber length, the length may be increased near the nose bar or stripping plate. This is because the fibers may be clogged, and in the case of the ultra-short fibers, they are difficult to peel off and come out in the form of threads.

As described above, when various kinds of cotton are used,
This is cut into a size of 1 to 3 inches, sericin is removed to the third layer, and sodium hydroxide is used in a well-known water ratio of 10 in order to increase exposure, remove impurities, and sterilize. 1 to 20 minutes for boiling scouring, washing with hot water to neutralize,
After scouring at 120 ° C. to 140 ° C. for 0 to 20 minutes, washing with water, dehydration, opening, and complete drying are used as the raw material of the silk fiber in the present invention. As a refining method that drops the final sericin to the third layer, in the case of alkaline refining, unlike other refining agents, fibroin does not adhere to each other, and fibroin can be made the softest. This is because when struck with, it easily fibrillates, making the most of the natural delicate crimp of the cocoon curve. Since the silk fiber thus obtained is only sericin, it is a useful silk raw material for the human body. Other than the above-mentioned scouring method, there is no problem in using enzyme scouring. The silk raw material is finally subjected to alkali scouring or high-pressure scouring. For alkali scouring, boiling scouring for 10 to 20 minutes, and for high-pressure scouring, 120 ° C to 1
By performing the process at 40 ° C for 10 to 20 minutes, sericin is removed up to the third layer, and it becomes a fibroin fiber useful for the human body. In addition, it has a sterilizing action and an optimal action for skin disorders. It has a suitable crimp for the production of non-woven fabrics and is a raw material for silk fibers that entangle with chitin fibers.
The silk fiber raw material thus obtained exhibits a natural crimp, which is optimal as a raw material for a non-woven fabric, is a defect of cotton-like chitin fibers, has no crimp, and has a low tensile strength.
The drawback of being too light is compensated by making it a mixed type,
It is entangled with cotton-like chitin fibers, does not require any binder, and can be easily transferred to web formation for nonwoven fabric production. The basis weight of the web is, for example, 20 to 300 g / m2
And

The non-woven fabric may be manufactured by any of conventionally used methods such as a dry method, a so-called needle punch method, and a hydroentangling method (spun lace). In addition, regardless of whether it is a wet method, any method can be used regardless of various methods conventionally used for producing chitin fibers for commercialization (for example, a wet paper shape or simply a web-like cotton shape).
In addition, when the silk fiber is opened, if an antistatic agent is mixed in advance, or if an antistatic agent is mixed at the stage of manufacturing the nonwoven fabric, good work efficiency results can be obtained. By producing a non-woven fabric by any of the above-mentioned methods, it can be produced at a lower cost, in large quantities, by a stable production method, and 90% chitin fiber is used for relatively serious skin disorders.
It is possible to obtain almost the same performance as before by using a product containing
Compared to 0% chitin fiber products, it leads to a significant cost reduction, and even with mild cases, the mixture of chitin fibers, which has a higher function than silk, makes it possible to work more effectively against skin disorders. It is much cheaper than textile products, and it is possible to provide various products that come into direct contact with the human body and medical aids, depending on the mixing ratio. In the future, silk auxiliary silk thread and cotton, and expensive and rarely manufactured. , Utilizing chitin fiber that has not played a social role for performance,
It has opened a great way, and it has become possible to provide a very useful and effective textile medicine medical aid in a society where various skin disorders will increase more and more in the future.

Up to now, there has been no way of effective utilization, and there has been a tendency for secondary silkworm threads and the like to stick around the world. However, as in the present invention, after the secondary silkworm threads and the like are scoured and made into fluff, short fibers are formed. Through the formation of medium fiber, the delicate crimp remaining in the cocoon curve and the crimp originally possessed by the silk raw material fiber can be pulled out, and the cotton-like chitin fiber is entangled and has strength, and is a web for nonwoven fabric production. Can be easily and efficiently manufactured. It is extremely easy to form a non-woven fabric by mixing cotton-like chitin fibers with the short-fiber to medium-fiber cocoon-like silk raw material from which such a delicate crimp is drawn out.

Since it is not necessary to give a crimp to the raw material in the wet method, a non-woven fabric of chitin fiber has already been manufactured, but it is very difficult to make a web of 100% cotton-like chitin fiber in the dry method, and it was possible to do so. Even as the subsequent non-woven process, for example, as a needle punch type or spun lace type web, because it is too light and delicate, there was not enough fiber strength to endure in the manufacturing process,
Manufacturing was facilitated by mixing the silk fiber raw materials.

The ratio-mixed non-woven fabric thus obtained is cut into a size and shape suitable for each part of the human body and each movement, and is directly contacted with the human body, so that the characteristic feature of chitin fiber is skin. As a soft and strong non-woven fabric having a good adhesion to, a characteristic of silk fiber, it was possible to obtain a remarkable action for various skin disorders (burns, cuts, allergic dermatitis, bedsores, etc.). For example, for whole body burns, etc., it is used as a sheet and effectively protects the skin, and both of the above fibers are excellent in hygroscopicity, breathability, sweating property, etc., atopic dermatitis on the face, burns, etc. It can be used with confidence and can be used on any other part of the human body. It can be easily post-processed at home, has good adhesion to the human body, and has an excellent function in terms of hemostasis. In the future, it has the potential to be used for various skin disorders.

When the above-mentioned mixed type nonwoven fabric is punched out into a substantially facial shape and the eyes, mouth and nose are punched out and used for skin disorders of the face, adhesion to the skin, analgesic effect, water absorption,
It becomes the most suitable for skin protection such as moisturizing. In particular, by using it for sleeping time, it does not harm the skin even if it is used for a long time, it is useful for reducing and healing skin disorders and has an analgesic effect, so it is possible to sleep well and is a very useful method. .

If the above non-woven fabric is cut into a size of about 20 cm × 10 cm, it can be easily post-processed at home, and can be used on the neck, joints and other parts of the human body regardless of adult or child. You can do it, and you can reduce the rash by applying it to the rash area. In addition, by making mittens (with or without fingers) of the above-mentioned non-woven fabric, it is possible to exert a healing effect on skin disorders of hands during sleep, regardless of adult children. Furthermore, if the above-mentioned non-woven fabric is made into a tubular shape and fixed to the upper and lower parts with a string or rubber, it can be used for skin disorders of the arms, upper arms, thighs, and below-knee parts. Also available for feet. Further, by sticking the above-mentioned non-woven fabric to a skin tape, it becomes possible to deal with skin disorders in a more vigorous part or a smaller part. Further, if the above-mentioned non-woven fabric is used in the form of a sheet, it effectively acts on bed sores and back burns, and if it is used as a pillow cover in the form of a small sheet, it is useful for skin damage and protection of the head. Moreover,
The above-mentioned non-woven fabric has no adverse effect on the skin even if it is used in contact with the skin for a long time, and has good adhesion to the skin, analgesic effect, water absorption, moisture retention, breathability, and allergic dermatitis. It is useful as a skin protector for burns, traumatic debridements, etc. In addition, it can exhibit its performance sufficiently as a material for paper diapers.

[0035]

EFFECTS OF THE INVENTION According to the present invention, the crimp of the silk fiber causes the silk fiber to be entangled with the cotton-like chitin fiber, and a binder is not required at all, so that a nonwoven fabric can be easily obtained. In particular, silk fibers can improve the tensile strength of cotton-like chitin fibers, facilitate post-processing, increase flexibility, facilitate handling, and be reasonably priced. For example, by treating 90% chitin fiber in products with severe skin damage, it is possible to obtain almost the same performance as before, and in terms of cost, compared to products containing 100% chitin fiber. It leads to a significant cost reduction, and even if it is mild, it is possible to work more effectively against skin disorders by mixing chitin fiber, which has more than silk function, and is much cheaper than silk fiber products. , Various products that come into direct contact with the human body and medical aids,
It is also possible to provide it by the mixing ratio, and in the future, it will be a great way to utilize secondary silkworm silk and cotton, as well as chitin fiber, which is expensive and rarely manufactured, and has not fulfilled its social role for performance. It is possible to provide a medical aid for textile products, which is very useful and effective in a society where various skin disorders will increase more and more in the future.

[Brief description of drawings]

FIG. 1 is an explanatory view of a manufacturing process of a nonwoven fabric of the present invention.

Claims (1)

[Claims] 1. A sub-silk thread or the like (selection cocoon, scraps from the spinning process, scraps from the weaving process) is scoured into half cotton or seven minutes kneaded into fluffy cotton, or various fluffy cotton is used, From short fiber to medium fiber, after cutting, alkali scouring or high pressure scouring, post-treatment such as neutralization and washing, silk fiber obtained by opening and chitin extracted from crustaceans A purified highly transparent chitin solution is produced by wet spinning, and cotton-like chitin fibers cut into short fibers or medium fibers are mixed substantially uniformly at a mixing ratio of 10:90 to 90:10 to produce a web. A mixed non-woven fabric of chitin fibers and silk fibers.