JPH0742058A - Regenerated cotton nonwoven fabric and its production - Google Patents

Abstract

PURPOSE:To form a regenerated cotton nonwoven fabric having a cloud-stream pattern, a Japanese paper-like appearance and excellent mechanical strength by using cotton fiber rag opened to an opening degree falling within a specific range and integrating the rag by a three-dimensional interlocking treatment. CONSTITUTION:This nonwoven fabric made of regenerated cotton fiber is produced by opening a yarn or cloth made of cotton fiber to an opening degree of >=30% with a rag opener, treating the opened product with a random webber to form a web composed of cotton fiber rag having an opening degree of 40-75% and applying a high-pressure liquid jet to the web to integrate the fibers constituting the web by the three-dimensional interlocking of the fibers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recycled cotton non-woven fabric which has excellent mechanical strength, has a cloud-like pattern and a Japanese paper-like appearance, and is suitable as a material for underwear, towels, wiping cloths and packaging materials. The present invention relates to a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as a wiping cloth, a cotton non-woven fabric has been known which utilizes the inherent water absorption and oil absorption of cotton fibers. This non-woven fabric is made from raw cotton fiber as a starting material, refined and bleached, and then made into a web using a card machine, which is then subjected to high-pressure liquid columnar flow treatment to entangle and integrate cotton fibers three-dimensionally. Alternatively, it is manufactured by a method in which raw cotton fiber is used as a starting material, a web is prepared using a card machine, and a high-pressure liquid columnar flow treatment is applied to the web to three-dimensionally entangle and integrate the cotton fibers, followed by refining and bleaching. Has been done. These conventional cotton non-woven fabrics are manufactured by the method described above, and have sufficient mechanical strength for practical use, but their appearance is extremely scarcely changed. Regarding the production of these conventional cotton non-woven fabrics, the former method of refining and bleaching cotton fibers and then converting them into webs causes the fibers to become entangled tightly by refining and bleaching, and the cotton wax fractions drop out. Therefore, there is a problem that it is difficult to defibrate the web when creating a web using a card machine, and the defibration causes a large number of single fibers having an extremely short fiber length. A method of applying an oil after refining and bleaching for the purpose of improving defibration can be considered, but improvement of defibration is not sufficient only by taking such a means. Also, a method of refining and bleaching after defibrating with a card machine and then re-webbing with a card machine can be considered, but this method increases the number of steps and is industrially disadvantageous. On the other hand, the latter method of refining and bleaching after making cotton fiber into a non-woven fabric has good defibration property because the cotton wax does not fall off when a web is made using a card machine, but it is made into a non-woven fabric. Since it is smelted and bleached after being processed, the cotton fiber is required to have sufficient tensile strength to withstand these steps. For example, the web is oriented in both the longitudinal and latitudinal directions and the basis weight is 6
It is necessary to make it about 0 g / m ² or more, and refining and
It is difficult to pass the bleaching process. If the strength of the cotton fiber is to be increased for the purpose of improving the passability of the refining and bleaching process, the cotton fiber with long fiber length and high single fiber strength is inevitably selected. The production of cotton fiber that fully guarantees that the production is extremely small, is expensive, and is hardly available industrially.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above problems, has excellent mechanical strength, has a unique cloud-like pattern and a Japanese paper-like appearance, and is suitable for underwear, towels, wiping cloths, and packaging materials. An object of the present invention is to provide a recycled cotton non-woven fabric suitable as a material for use in the same and a manufacturing method thereof.

[0004]

The present inventors have arrived at the present invention as a result of extensive studies to solve the above problems. That is, the present invention has the following configurations as its gist. 1) A regenerated cotton non-woven fabric having a defibration rate of 40 to 75% as a constituent fiber of cotton fiber and integrated by three-dimensional entanglement of the constituent fibers. 2) After defibrating a yarn or a cloth made of cotton fibers with a fluffing machine to a defibration rate of 30% or more, using a random webber, the defibration rate of 40 to 75% is used as the constituent fibers A method for producing a regenerated cotton non-woven fabric, which comprises producing a web, and then subjecting the obtained web to a high-pressure liquid columnar flow treatment to entangle and integrate the constituent fibers three-dimensionally.

Next, the present invention will be described in detail. The cotton fiber fluff in the present invention is obtained by defibrating with a fluffing machine using a yarn or a woven fabric or knitted fabric made of refined and bleached cotton fiber as a raw material. The yarn made of cotton fibers or the cloth such as woven fabric or knitted fabric as used herein is simply bleached or fluorescently exposed. As the color tone, a simple white color is preferable, and it is not preferable to use, for example, a color that is colored by dyeing or the like, or a mixture thereof because the color tone of the nonwoven fabric is not constant. The woven fabric or knitted fabric may be cutting waste generated in a sewing factory in addition to ordinary products, and the latter is preferable from the viewpoint of effective use of resources and economical efficiency of raw materials. . The cotton fiber fluff in the present invention can be easily obtained by using, for example, a ratchet machine, a notch breaker, a garnet machine, or a slicing machine. The fluff machine used depends on the desired fluff shape, the thickness of the constituent fibers, and the twisting strength, but usually, the same fluff machine is used by connecting a plurality of the same bristles in series, or It is advisable to use a combination of two or more selected anti-fluffing machines. The defibration using this anti-fluffing machine needs to have a defibration rate of 30% or more. The defibration rate (%) here is defined by the following equation (a). Defibration rate (%) = (weight of fluff-weight of filamentous material) x 100 / weight of fluff ... (a) If the defibration rate using this fluffing machine is less than 30%, the next step will be random. When producing a web using a web, it is not preferable because the random web further makes it difficult to defibrate the fiber to a defibration rate of 40 to 75% and a large load is applied to the device. Therefore, in the present invention, the defibration rate using the anti-fluffing machine is set to 30% or more.

Regarding the use of the anti-fluffing machine, for example, when a plurality of the same turning machines are connected in series, 4 to
It is good to set the number of machines so that 8 cylinders are connected, and if the number of connected cylinders is less than 4, sufficient defibration cannot be obtained, while the number of connected cylinders should be 8 If it exceeds the above range, the fibers will be torn off and a large number of short fibers will be generated, which is not preferable. When two or more types of anti-fluffing machines are used in combination, for example, a ratchet machine,
It is advisable to combine either a note breaker or a turning machine with a garnet machine. Since the lagging machine, notch breaker, or slicing machine has teeth with a shape suitable for unraveling the fabric into filaments, it unravels the fabric and disentangles the filaments into a mixture of filaments. The next garnet machine may be a normal 3-4 pile type machine. In the defibration using the above-mentioned rag machine, notch breaker or slicing machine, if the defibration rate is 20% or more, the load of the garnet machine will be increased when further defibration is performed using the next garnet machine. Can be reduced, which is preferable.

In the present invention, subsequent to the defibration using the anti-fluffing machine, the defibration rate of 40 to 40 is further applied using a random webr.
A web is prepared by defibrating it to 75% and homogenizing it in the thickness direction. The defibration rate using this random web is 40
If it is less than%, the three-dimensional entanglement formed when the web is subjected to high-pressure liquid columnar flow treatment is insufficient, and the mechanical strength of the nonwoven fabric itself becomes insufficient. When it exceeds the above range, the number of filaments is small, the mechanical strength of the nonwoven fabric itself is not improved, and the unique pattern of cloud flow and the appearance of a Japanese paper-like appearance do not appear, so both are not preferable. As for the random web, the air flow method or the centrifugal force method may be used, but the centrifugal force method is preferable because a web with less thickness unevenness can be produced. As this random webber, for example, Hergeth-Hollingswort
Random webber from h company, Random webber from Spinbau company or Random webber K-21 type from Fehrer company can be used.

In the present invention, the web obtained above is subjected to a high-pressure liquid columnar flow treatment so that the constituent fibers are three-dimensionally entangled and integrated. This three-dimensional entanglement is formed by a known so-called high-pressure liquid flow treatment, whereby the shape of the nonwoven fabric is maintained and mechanical strength is provided. When performing this high-pressure liquid flow treatment, for example, a device in which injection holes having a hole diameter of 0.02 to 4.5 mm are arranged at a hole density of 30 to 60 holes / in ² is used, and the injection pressure is 15 to 300 kg / cm ^2. A method of ejecting the G high-pressure liquid from the ejection hole is adopted. Generally, water or hot water is used as the high-pressure liquid. The distance between the injection hole and the web is preferably 1 to 15 cm. If this distance is less than 1 cm, the texture of the nonwoven fabric obtained by this treatment is disturbed, while on the other hand, this distance is 15c.
When it exceeds m, the impact force when the liquid flow collides with the web is reduced, and the three-dimensional entanglement is not sufficiently applied to the constituent fibers,
Neither is preferable. This high-pressure liquid flow treatment may be performed multiple times as necessary. As the support material for supporting the web when performing the high-pressure liquid flow treatment, for example, 20 to 100
There is no particular limitation as long as the high-pressure liquid flow can penetrate the web, such as a metal mesh or synthetic resin mesh screen or a perforated plate. After the high-pressure liquid stream treatment, excess moisture is removed from the treated web. A known method can be adopted for removing the excess water. For example, a squeezing device such as a mangle roll may be used to mechanically remove excess water to some extent, and then a remaining amount of water may be removed using a drying device such as a continuous hot air dryer to obtain a final nonwoven product.

As described above, the non-woven fabric of the present invention is one in which constituent fibers are three-dimensionally entangled and integrated.
In this non-woven fabric, the basis weight is not particularly limited, but from the viewpoint of mechanical strength, it is preferably 15 g / m ² or more, and assuming that a wiping cloth is used,
From the viewpoint of required water absorption and oil absorption, it is preferably 30 g / m ² or more. The non-woven fabric of the present invention can be used not only as a non-woven fabric but also as a laminate with a long fiber non-woven fabric prepared by a spunbond method or as a laminate with a normal thermoplastic synthetic resin film.

Next, the present invention will be specifically described based on examples, but the present invention is not limited to these examples. Example 1 White knitted wool knitted wool with a defibration rate of 40% was prepared by using eight scrapers connected in series with the cutting waste of cotton knitted underwear as a starting material, and subsequently, a random web of Hergeth-Hollingsworth Co. With a defibration rate of 65% and a basis weight of 45
A web of g / m ² was created. The resulting web was then placed on a 50 mesh stainless steel net for high pressure liquid flow treatment. High pressure liquid flow treatment has a pore size of 0.3
Using a high-pressure columnar water stream treatment device provided with injection holes of mm, the injection pressure was 150 kg / cm ² G, and the columnar water stream was made to act from a position 80 mm above the web. The high pressure liquid flow treatment was performed once from the front and back of the web. Then, excess water was removed from the obtained treated product using a mangle roll, and then a drying process was performed using a hot air dryer to obtain a nonwoven fabric product. The obtained non-woven fabric product is defibrated monofilaments, and the monofilaments and unfibrillated filaments are three-dimensionally entangled to be well integrated, and have excellent mechanical strength and cloud-like shape. It has a pattern and a Japanese paper-like appearance, and has the same whiteness and appearance as a woven fabric such as pure white underwear and waishatsu, and was suitable for use as a material for underwear, towels, wiping cloths, and the like.

Example 2 Using the cutting scraps of cotton knitted undergarment as a starting material, a white cotton knitted fluff with a defibration rate of 50% was prepared using five turning machines connected in series, and a random webber of Spinbau Co. Was used to prepare a web having a defibration rate of 70% and a basis weight of 80 g / m ² . The resulting web was then placed on a 20 mesh stainless steel twill net and subjected to high pressure liquid flow treatment. For the high-pressure liquid flow treatment, a high-pressure columnar water flow treatment device having injection holes with a hole diameter of 0.25 mm was used, and the injection pressure was set to 1
20 kg / cm ² G was applied once from the front and back of the web. Thereafter, in the same manner as in Example 1, a non-woven fabric product was obtained. As in Example 1, the obtained non-woven fabric product was satisfactorily integrated by defibrating the fibrillated filaments and the fibrillated filaments were entangled three-dimensionally and had good mechanical strength. It had an excellent cloud-like pattern and a Japanese paper-like appearance, and had a whiteness equivalent to that of a pure white twill fabric, making it suitable for use as a material for wiping cloths and packaging materials.

Example 3 Using a residual yarn of pure white cotton yarn for socks as a starting material, a ragging machine was used to defibrate it to a defibration rate of 30%, and then a double doffer type garnet machine in which four cylinders were connected was used. The fluffing rate is 6% using a random webber K-21 type manufactured by Fehrer.
A web having a basis weight of 5 g and a basis weight of 60 g / m ² was prepared. Then, the obtained web was placed on a 100-mesh stainless steel net and a high-pressure columnar water stream treatment apparatus provided with injection holes having a hole diameter of 0.15 mm was used, and the injection pressure was set to 100.
A non-woven fabric product was obtained in the same manner as in Example 1 except that the pressure was set to kg / cm ² G and the high pressure columnar water flow treatment was applied to each of the front and back sides of the web. The obtained non-woven fabric product is well integrated, has excellent mechanical strength, has the same whiteness and appearance as a pure white knitted fabric, and can be suitably used as a material for underwear, wiping cloth, packaging materials, etc. there were.

[0013]

The nonwoven fabric of the present invention has a defibration rate of 40 to 75.
% Cotton fiber fluff is a constituent fiber and is integrated by three-dimensional entanglement of the constituent fibers, has excellent mechanical strength, has a cloud-like pattern and a Japanese paper-like appearance,
Suitable for underwear, towels, wiping cloths and packaging materials. Further, according to the production method of the present invention, it is not necessary to carry out refining and bleaching both before and after web formation, so that the nonwoven fabric can be produced efficiently.

Claims (2)

[Claims] 1. A regenerated cotton non-woven fabric having a defibration rate of 40 to 75% cotton fiber fluff as a constituent fiber and integrated by three-dimensional entanglement of the constituent fibers. 2. A yarn or cloth made of cotton fibers is defibrated with a fluffing machine to a defibration rate of 30% or more, and then a fluffing rate of 40 to 75% is used to fabricate fluff of cotton fibers. A method for producing a recycled cotton non-woven fabric, which comprises producing a web of fibers, and then subjecting the obtained web to a high-pressure liquid columnar flow treatment to three-dimensionally entangle and integrate the constituent fibers.