KR20150105767A - Mehtod for manufacturing water dispersible nonwoven - Google Patents

Abstract

The present invention relates to a method for manufacturing a water-dispersible nonwoven fabric which is manufactured by mixing one or more from natural fiber, regenerated fiber, and synthetic fiber. The water-dispersible nonwoven fabric is manufactured by an embossing process of inserting the nonwoven fabric into an embossing machine comprising a rubber roller, a first steel roller on which an embossing pattern is formed, and a second steel roller and then passing the nonwoven fabric through the rubber roller, the first steel roller, and the second steel roller in order.

Description

[0001] METHOD FOR MANUFACTURING WATER DISPERSIBLE NONWOVEN [0002]

The present invention relates to a process for producing a water-dispersible nonwoven fabric, and relates to a process for producing an environmentally-friendly water-dispersible nonwoven fabric by imparting water-dispersibility to the nonwoven fabric through a physical method.

The nonwoven fabric is made of felt in the form of a felt, which is arranged in parallel or in an indefinite direction without being subjected to a woven process, and is formed by a physical method such as a synthetic resin adhesive, heat fusion, needle punching or high pressure water. And recently, it has been widely used for tissues, cloths, towels and the like which are used for disposable use.

Most of the nonwoven fabrics used for disposable use are used in a bathroom or drinking water, and most of them are used in a state of absorbing water. In the disposable nonwoven fabric which absorbs water, much water is absorbed after being used, and then it is discarded in a garbage can.

Therefore, recently, disposable nonwoven products that can be disposed of in the toilet after use have been developed and used.

These disposable nonwoven products must have a water-dispersing function so that they can be poured into the toilet after use, and if not, there is a risk of blocking the drain of a toilet or the like.

With respect to such water-dispersible nonwoven fabrics, the articles of manufacture may be prepared as dry materials, such as tissues or wipers, which are well pulverized and well dispersed when placed in large amounts of water or aqueous solution. The tissue or wiper should be disintegrated in water even if it is slightly agitated without increasing the temperature or adding chemicals.

Water-soluble or water-dispersible polymeric binders have been used in the production of nonwoven substrates and are generally referred to as poly (vinyl alcohol) (PVOH), PVOH-stabilized vinyl acetate or vinylacetate based polymers such as vinyl acetate- ethylene (VAE) ≪ / RTI > The treated dried nonwoven webs need not have collapsed during use, but need to have sufficient wet strength to disintegrate in excess water, such as toilet water. Many nonwoven webs currently on the market have either no wet strength or too high a permanent wet strength. The electrons are not suitable for use in products such as feminine hygiene products because they are decomposed when the force is applied. The latter has the risk of blocking the plumbing and can not be disposed of safely in the toilet.

In order to use the above water-dispersible nonwoven fabric product as a disposable article, it is necessary to maintain its integrity when wet or wet, but it must be completely dispersible in a large amount of water or an aqueous solution as in toilet water.

Several methods have been proposed as solutions to the disintegration of dry nonwoven products during use. One method utilizes the addition of boric acid or derivatives to an aqueous lotion composition applied to a nonwoven substrate to maintain the integrity of the nonwoven substrate. The following patent documents illustrate the prior art of this technique.

U.S. Patent No. 4,245,744 discloses a nonwoven fibrous sheet impregnated with a PVOH-containing vinyl acetate-based polymer, which is kept in contact with a dilute aqueous solution of a precipitant or gelling agent for PVOH, such as boric acid.

U.S. Patent No. 5,252,332 discloses a packaged small towel comprising a nonwoven fibrous sheet impregnated with a PVOH or PVOH containing binder in contact with an aqueous solution containing boric acid ions and bicarbonate ions.

U.S. Patent No. 5,384,189 discloses that the fibers are bonded together by a water soluble binder comprising an unsaturated carboxylic acid / unsaturated carboxylic acid ester copolymer (1 to 60 mole% of the repeating units derived from the carboxylic acid are in the form of a salt) RTI ID = 0.0 > hydrolysable < / RTI > nonwoven fabrics. The binder is insoluble in an aqueous solution which is soluble in tap water but contains less than 0.5% by weight of a neutral inorganic salt containing monovalent ions.

U.S. Patent No. 5,256,417 discloses a packaged single use disposable towel comprising a sheet of nonwoven fabric impregnated with a binder such as PVOH or an aqueous polymer emulsion containing PVOH as a protective colloid. The sheet remains wet in the package by contact with a non-aqueous liquid composition that is a liquid organic compound that is non-compatible with PVOH.

JP-A-3-292924 discloses a water-decomposable cleaning article impregnated with a polyvinyl alcohol-containing fiber with an aqueous solution of boric acid, and JP-A-6-198778 discloses a nonwoven fabric comprising polyvinyl alcohol, And water-decomposable napkins containing bicarbonate ions. However, the polyvinyl alcohol is weak against heat, and when it is 40 DEG C or more, the wet strength of the water-decomposable cleaning article and the water-decomposable napkin is lowered.

However, the water-dispersible nonwoven fabric using the water-soluble or water-dispersible polymer binder has a problem in that a large amount of contaminants are discharged after being dispersed in water, which hinders the environment and makes purification of water difficult.

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a nonwoven fabric which is free from water by applying physical damage to the nonwoven fabric without using a water- And a method for producing the water-dispersible nonwoven fabric.

It is another object of the present invention to provide a water-dispersible nonwoven fabric which can be used easily without loosening even if it is disposed in a toilet or toilet in a public restroom.

The present invention relates to a method for producing a water dispersible nonwoven fabric using a nonwoven fabric formed by mixing one or more of natural fibers, regenerated fibers and synthetic fibers, wherein the nonwoven fabric comprises a rubber roller, an emboss pattern 1 is inserted into an embossing machine constituted by a first steel roller and a second steel roller and is manufactured by an embossing process which sequentially passes between the rubber roller, the first steel roller and the second steel roller, And a method for producing the water-dispersible nonwoven fabric.

Wherein the fibers forming the nonwoven fabric have a fiber length of 5 to 100 mm and a fineness of 0.5 to 5 denier.

Wherein the embossing step is repeated two or more times.

Wherein the first steel roller and the second steel roller have a temperature of 50 to 200 DEG C and a pressure between rollers of 5 to 100 bar.

Wherein the embossed pattern has a circular or polygonal shape with a diameter of 0.01 to 2.00 mm, an interval of 0.01 to 1.50 mm and a depth of 0.01 to 1.00 mm.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that, in the drawings, the same components or parts are denoted by the same reference numerals whenever possible. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as to avoid obscuring the subject matter of the present invention.

As used herein, the terms " about, "" substantially, "" etc. ", when used to refer to a manufacturing or material tolerance inherent in the stated sense, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

1 is a schematic view of a method for producing a water dispersible nonwoven fabric according to the present invention.

The present invention relates to a method for producing a water-dispersible nonwoven fabric, and is a water-dispersible nonwoven fabric which can be produced using a general nonwoven fabric.

Non-woven fabric formed by mixing one or more of natural fibers, regenerated fibers and synthetic fibers.

The nonwoven fabric of the present invention is formed by mixing one or more of natural fibers, regenerated fibers and synthetic fibers. The natural fibers usable in the present invention are cotton, wool, silk, etc., and regenerated fibers include rayon, acetate , Synthetic fibers include polyamide fibers, polyester fibers, polypropylene fibers, acrylic fibers, and polyethyl fibers. In addition, biodegradable fibers such as polylactic acid fibers and the like may be used.

The nonwoven fabric usable in the present invention may be any of nonwoven fabric formed by mixing one or more of the above natural fibers, regenerated fibers and synthetic fibers. For example, a spun lace nonwoven fabric, an air laid nonwoven fabric, a wet laid nonwoven fabric, A nonwoven fabric, a thermal bonding nonwoven fabric, a needle punching nonwoven fabric, a spun bond nonwoven fabric, and a meltblown nonwoven fabric.

The fibers forming the nonwoven fabric may use long fibers, but it is preferable to use short fibers having a fiber length of 5 to 100 mm and a fineness of 0.5 to 5 denier so as to facilitate water dispersibility.

Among the above nonwoven fabrics, the most suitable nonwoven fabric according to the present invention is most preferably a spunlaced nonwoven fabric, a needle punched nonwoven fabric and a wet laid nonwoven fabric, which are produced by physically entangled fibers, not by an adhesive or by fusion of fibers by melting .

In addition, since the nonwoven fabric usable in the present invention may have poor water dispersibility when it has an excessively high basis weight, the basis weight of the nonwoven fabric to be used is preferably 15 to 200 g / m 2 to facilitate water dispersibility.

1, the nonwoven fabric of the present invention comprises a rubber roller 100, a first steel roller 200 having an emboss pattern formed therein, and a second steel roller 300 It is put into the embossing machine and physical damage (scratch) is applied to the nonwoven fabric.

The rubber roller 100 is a roller that applies tension so that the nonwoven fabric 10 fed from the unwinder 20 always maintains smoothness.

The first steel roller 200 is a roller for forming an emboss pattern and physically damages the nonwoven fabric. The second steel roller 300 is a nonwoven fabric with the first steel roller 100, To thereby physically damage the nonwoven fabric.

The nonwoven fabric passing between the rubber roller 100, the first steel roller 200, and the second steel roller 300 is wound on a winder 30 as shown in FIG.

As shown in FIG. 1, the nonwoven fabric 10 applied to the embossing machine physically damages the nonwoven fabric by an embossing process that sequentially passes between the rubber roller 100, the first steel roller 200, and the second steel roller 300, , The nonwoven fabric is physically damaged by the emboss pattern of the first steel roller between the first steel roller 200 and the first steel roller 200 and the second steel roller 300.

The first steel roller 200 and the second steel roller 300 are heated to increase the water dispersibility of the nonwoven fabric by adding thermal damage to the nonwoven fabric. The heating temperature of the first steel roller 200 and the second steel roller 300 forms a non- The temperature between the rubber roller 100 and the first steel roller 200 and the pressure between the first steel roller 200 and the second steel roller 300 is preferably 5 To 100 bar.

The embossing process may be repeated two or more times according to the basis weight of the nonwoven fabric supplied to the embossing machine. That is, when the basis weight of the supplied nonwoven fabric is low, the embossing process can impart water dispersibility to the nonwoven fabric in one cycle. However, in the case of a nonwoven fabric having a high basis weight, the physical damage is weak due to a single embossing process, Therefore, the embossing process may be repeated twice or more according to the basis weight of the nonwoven fabric.

The emboss pattern of the first steel roller 200 physically damages the nonwoven fabric and may be formed in a polygonal shape such as a circular shape, a triangle shape or a square shape. The emboss pattern may have a diameter of 0.01 to 2.00 mm, an interval of 0.01 to 1.50 mm, a depth of 0.01 to 1.00 mm Lt; / RTI > When the diameter, the interval and the depth are lower than the above values, physical damage is too small and water dispersibility may be poor. When the diameter, interval and depth are larger than the above values, the properties of the nonwoven fabric are lowered, There may be difficulties in using.

In addition, the emboss pattern of the first steel roller 200 may be formed in a stripe shape, a letter shape, or an amorphous pattern. If the emboss pattern is a stripe shape, a letter shape or an amorphous pattern, the depth is preferably 0.01 to 1.00 mm will be.

The water-dispersible nonwoven fabric according to the present invention, which is manufactured by the embossing process composed of the rubber roller 100, the first steel roller 200, and the second steel roller 300 as described above, directly damages the fibers constituting the nonwoven fabric or intermittently cuts the fibers, The structure of the nonwoven fabric is reconstructed so as to be easily released into the nonwoven fabric.

As described above, the nonwoven fabric made of the natural fibers, regenerated fibers, synthetic fibers, etc. of the present invention is manufactured into a water-dispersible nonwoven fabric by using general nonwoven fabric.

In addition, since the water-dispersible nonwoven fabric is produced by a physical method without using a water-soluble adhesive, there is an eco-friendly effect since no pollutants are discharged after being dispersed in water.

1 is a schematic view of a method for producing a water dispersible nonwoven fabric according to the present invention.

Hereinafter, examples of the method for producing the water dispersible nonwoven fabric according to the present invention are shown, but the present invention is not limited to the examples.

Example  One

A 55 g / m2 spunlaced nonwoven fabric sample was prepared using 100 weight% viscose rayon fibers having a fineness of 1.5 and a fiber length of 40 mm. The properties of the spunlaced nonwoven fabric thus produced are shown in Table 1.

The above-mentioned spunlaced nonwoven fabric was fed once to an embossing machine composed of a rubber roller, a first steel roller having an embossed pattern and a second steel roller as shown in Fig. 1, to thereby produce a water dispersible nonwoven fabric according to the present invention . The processing conditions of the embossing process are shown in Table 2.

Example  2

A 50 g / m < 2 > spun lace nonwoven fabric sample was prepared by mixing 70 wt% viscose rayon fibers having a fineness of 1.5 denier and a fiber length of 40 mm and 30 wt% of high tenacity rayon tencel fibers having a fineness of 1.5 denier and a fiber length of 38 mm. The properties of the prepared spunlaced nonwoven fabric were as shown in Table 1, and the water dispersible nonwoven fabric according to the present invention was prepared in the same manner as in Example 1. The processing conditions of the embossing process are shown in Table 2.

Example  3

A needle punching nonwoven fabric sample of 120 g / m 2 was produced by mixing 70 wt% of polyester fibers having a fineness of 2 denier and a fiber length of 51 mm and 30 wt% of nylon fibers having a fineness of 2 denier and a fiber length of 51 mm. The properties of the fabricated needle punching nonwoven fabric were as shown in Table 1, and the embossing process was performed in the same manner as in Example 1, and the embossing process was performed twice to produce the water dispersible nonwoven fabric according to the present invention. The processing conditions of the embossing process are shown in Table 2.

Example  4

A spunlaced nonwoven fabric sample having a density of 53 g / m 2 was prepared by mixing 70 wt% viscose rayon fiber having a fineness of 1.5 denier and a fiber length of 40 mm and 30 wt% of polyester fiber having a fineness of 1.4 denier and a fiber length of 51 mm. The properties of the prepared spunlaced nonwoven fabric were as shown in Table 1, and the water dispersible nonwoven fabric according to the present invention was prepared in the same manner as in Example 1. The processing conditions of the embossing machine are shown in Table 2.

≪ Physical properties of nonwoven fabric of Examples 1 to 4 >

division weight thickness Tensile strength (kgf / 5 cm) Elongation (%) MD CD MD CD Example 1 55g / ㎡ 0.37mm 9.1 2.1 15 101 Example 2 50g / ㎡ 0.36mm 9.5 1.8 17 100 Example 3 120g / ㎡ 0.5mm 32 23 75 120 Example 4 53g / ㎡ 0.39mm 12.6 2.7 20 133

≪ Process conditions of Examples 1 to 4 >

division pressure Temperature Emboss pattern Embo pattern diameter Embo Spacing Embo depth Processing speed Example 1 28 bar 120 DEG C circle 0.45mm ~ 0.5mm 0.35mm ~ 0.4mm 0.2mm ~ 0.3mm 12m / min Example 2 32 bar 130 ℃ circle 0.45mm ~ 0.5mm 0.35mm ~ 0.4mm 0.2mm ~ 0.3mm 15 m / min Example 3 35bar 150 ℃ circle 0.45mm ~ 0.5mm 0.35mm ~ 0.4mm 0.2mm ~ 0.3mm 12m / min Example 4 30bar 130 ℃ circle 0.45mm ~ 0.5mm 0.35mm ~ 0.4mm 0.2mm ~ 0.3mm 18m / min * The pressure is the pressure between the rubber roller, the first steel roller and between the first steel roller and the second steel roller
* Temperature is the temperature of the first steel roller and the second steel roller.

◈ Water dispersion experiment

The water dispersion was evaluated by the Tube Flush Tester method used in Kelheim Fibers GmbH, Germany. The Tube Flush Tester method pours water up to about 1/3 of its full height in a plastic tube of a size that can be rotated 360º, puts the sample in it, closes the cap, rotates 180º, And repeats it continuously to determine the state of the fabric according to the number of rotations.

The circular cylinder used in this experiment had a round diameter of 10cm and a length of 105cm and poured 3.3kg of water into the cylinder from the bottom to 42cm. After filling the sample, the sample was rotated 180 š and then rotated 180 š And repeatedly performed the test. All the samples used in the experiment were made to be 16 x 20 cm, and the sample was wetted with three times the weight of the fabric.

The experimental results are classified into five according to the condition of the fabric as shown in Table 3. As a comparative example, the water flushable products of K, which are sold in the market, were tested by the same tube flush tester method and compared. The results are shown in Table 4.

<Experimental Results>

Revolutions 1 time Episode 2 3rd time 4 times 5 times Fabric condition Comparative Example ○ △ △ X XX XX Example 1 ○ ○ △ △ X Example 2 △ △ XX XX XX XX Example 3 ○ ○ △ X X Example 4 ○ △ △ X XX XX

As shown in Table 4, it can be seen that Example 2 of the water dispersible nonwoven fabric according to the present invention was dispersed more quickly than Comparative Example, and Example 4 can be judged to have the same water dispersibility as Comparative Example. Further, in Examples 1 and 3, it is judged that the water-dispersible non-woven fabrics according to the present invention have water-dispersibility because they are separated into two after five rotations. All of the water-dispersible non-woven fabrics produced according to the present invention have water-dispersibility.

DESCRIPTION OF THE RELATED ART [0002]
100: rubber roller 200: first steel roller
300: Second steel roller

Claims (5)

A method for producing a water dispersible nonwoven fabric using a nonwoven fabric formed by mixing one or more of natural fibers, regenerated fibers, and synthetic fibers,
The nonwoven fabric is put into an embossing machine composed of a rubber roller, a first steel roller having an emboss pattern formed therein, and a second steel roller, and the rubber roller, the first steel roller, , And the second steel rollers in order. The method for manufacturing a water dispersible nonwoven fabric according to claim 1,
The method according to claim 1,
Wherein the fibers forming the nonwoven fabric have a fiber length of 5 to 100 mm and a fineness of 0.5 to 5 denier.
The method according to claim 1,
Characterized in that the embossing step is repeated twice or more.
The method according to claim 1,
Wherein the first steel roller and the second steel roller have a temperature of 50 to 200 DEG C and a pressure between the rollers of 5 to 100 bar.
The method according to claim 1,
Wherein the embossed pattern has a circular or polygonal shape with a diameter of 0.01 to 2.00 mm, an interval of 0.01 to 1.50 mm, and a depth of 0.01 to 1.00 mm.

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