KR20120121079A - Wet Process Nonwoven Web and The Method for Preparing The Same - Google Patents

Abstract

PURPOSE: A wet type ramie non-woven fabric and a method for fabricating the same are provided to enhance antibacterial property, biodegradability, moisture absorption, and swelling property. CONSTITUTION: A method for fabricating a wet type ramie non-woven fabric comprises: a step of cutting a ramie fiber into long fiber and short fiber(S11); a step of mixing the long fiber and short fiber in a weight ratio of 70:30~60:40 and beating(S12); a step of dispersing the ramie fibers(S13); a step of unevenly laminating the dispersed ramie fibers using a wet type lamination device to form a web(S14); and a step of pressing the web at 80-100 Deg. C(S15). [Reference numerals] (S11) Cutting process; (S12) Beating process; (S13) Dispersing process; (S14) Laminating process; (S15) Pressing process

Description

Wet Process Nonwoven Web and The Method for Preparing The Same

The present invention relates to a wet type nonwoven fabric produced by using a wet lamination method and a method of manufacturing the same, and more particularly, to a method of manufacturing a wet type nonwoven fabric through a wet lamination process by interweaving different spun yarns having different fiber lengths. .

Clothing and industrial materials have been rapidly developed due to the development of petrochemical products, but there is a growing interest in environmentally friendly, harmless and biodegradable materials due to the depletion of petroleum, improved living standards and the development of civilization. As a result, in recent years, various functional reinforcement or use development of natural fibers such as ramie and cotton have been made.

Moshi is harmless to the human body, light and breathable compared to other fibers, and has been widely used as a material having excellent water absorption and divergence and antibacterial properties.

Since the uniformity of traditional ramie manufacturing methods is low and productivity is low, ramie fibers are manufactured using mechanization equipment to compensate for these disadvantages. However, the ramie is used exclusively for clothing. Since ramie has various functions such as antimicrobial activity, absorbency, and biodegradability, it is necessary to manufacture a wet type nonwoven fabric in order to manufacture a product using the same.

It is an object of the present invention to provide a method for producing a wet type nonwoven fabric prepared by mixing fiber fibers having different fiber lengths through a wet process. In addition, the manufacturing method of the present invention can provide a wet type of nonwoven fabric that can be applied to a variety of fields by being able to mass-produce a wet type nonwoven fabric that is easy to manufacture and excellent in uniformity by automating using mechanization equipment.

In order to solve the above problems, according to a preferred embodiment of the present invention, the step of cutting the ramie fibers to have a short fiber length and a long fiber length; Mixing the short fibers and the long fibers of the core fibers with 70:30 to 60:40 (weight ratio) and then beating and beating; Dispersing the beaten ramie fibers in two steps; Forming a web by unevenly laminating the dispersed ramie fibers using a wet lamination machine; And the laminated web provides a method of manufacturing a wet type of nonwoven fabric comprising the step of compressing in a thermal compression roller of 80 ~ 100 ℃.

According to another suitable embodiment of the present invention, the weight of the nonwoven fabric is controlled by the rotational speed of the thermal extrusion roller.

According to another suitable embodiment of the present invention, the weight of the nonwoven fabric is controlled by the rotational speed of the thermal extrusion roller.

According to another suitable embodiment of the present invention, the rotational speed of the thermal compression roller is characterized in that 10 to 20rpm.

The wet type nonwoven fabric prepared in the present invention can be widely used in various products such as mask packs and tea bags by utilizing the advantages of antibacterial, biodegradable, water absorbing, swelling, and simplification of process conditions.

1 is a process diagram schematically showing a method for producing a wet type nonwoven fabric of the present invention.
Figure 2 schematically shows the manufacturing process of the wet type nonwoven fabric of the present invention.
Figure 3 is a graph showing the water absorption of the wet type nonwoven fabric prepared in the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

1 is a process diagram schematically showing a method for producing a wet type woolly nonwoven fabric of the present invention. Referring to Figure 1, the method for producing a wet type of nonwoven fabric of the present invention is the step of cutting the fiber (S11); Beating process of the cut ramie fibers (S12); Dispersion process of the beaten ramie fiber (S13); Wet lamination process of the dispersed ramie fibers (S14); And the compression step (S15). In the cutting step (S11), the ramie fibers are cut so that the fiber length is 4 ~ 6mm and 10 ~ 12mm, respectively.

Next, after mixing the ramie fibers (4 ~ 6mm) having a short fiber length and the ramie fibers (10 ~ 12mm) having a long fiber length prepared in the cutting process at 70: 30 ~ 60: 40 (weight ratio), beating To the process. In the present invention, weaving between the fibers of different fiber lengths in the cutting step was used for the production of nonwoven fabric to suppress the aggregation between fibers. The mixed ramie fiber is beaten using an aqueous sodium hydroxide solution and an aqueous hydrochloric acid solution (S12). In the beating process, 20% sodium hydroxide aqueous solution having a concentration of 20% was immersed for 10-20 minutes, and then neutralized by adding 30% sodium hypochlorite aqueous solution, and 99% sodium thiosulfate in secondary. Implement a neutralization method.

The cut ramie fibers are subjected to a beating process, thereby changing the shape and structure of the ramie fibers, thereby increasing the bonding strength between the fibers.

Next, the beaten hairy fibers are dispersed in two stages (S13). In order to facilitate the dispersion, firstly, the air gun is first dispersed, and then polyethylene oxide is added as a dispersant to disperse secondly, so that the beaten fibers are uniformly dispersed. At this time, the dispersant is preferably added to 0.05 ~ 1wt% based on the total solution weight.

In addition, the dispersed ramie fibers are laminated in water through the circulation of the water and the left and right vibration of the roller to form a web (S14).

2 illustrates a dispersion process and a lamination process in a ramie web manufacturing process of the present invention. Referring to FIG. 2, first, the beaten fiber fibers 21 are first dispersed by the air gun 23 in the primary disperser 22. Next, the dispersant 24 is mixed and dispersed in the secondary disperser 25. The secondary dispersed ramie fibers are placed in the submerged laminate 26 having a roller attached to the lower end, and are uniformly dispersed in the water through left and right vibrations of the roller. The fiber fibers uniformly dispersed in water are compressed by moving them to the thermocompression roller 28 via the transfer roller 27. The thermocompression roller 28 removes the moisture of the laminated ramie web and gives shape stability (S15). In the above, the temperature of the thermal compression roller is preferably 80 ~ 100 ℃. The distance between the roller and the roller is 1 to 1.5 gauge to give pressure to the web by the distance between the roller and the roller. The ramie web prepared in this way was treated once by a needle punching process, and water binding was performed once to impart a bonding force to the web.

In the present invention, by adjusting the rotational speed of the thermal compression roller it is possible to adjust the basic weight of the final product according to the purpose and purpose of the ramie nonwoven fabric. A thermal compression roller having a diameter of 3 m can be preferably used, and the rotational speed is preferably 10 to 20 rpm, more preferably 14 to 17 rpm.

Hereinafter, the present invention will be described in detail with reference to Examples, but the scope of the present invention is not limited or reduced by the Examples.

The physical properties of the wet type nonwoven fabric prepared in the present invention were measured by the following method.

(1) tensile properties

Tensile properties were used samples of 25 × 125mm size was measured by a tensile tester (Instron 4467, INSTRON) in accordance with ASTM D 4632. The load cell used for the measurement was performed at 5 kN and an extension rate of 50 mm / min.

(2) water absorption rate

The water absorption test was performed using a 100 × 100mm size sample according to the liquid absorption capacity method (LAC) of KS K ISO 9073-6, and fixed in 120 × 120mm mesh for 2 minutes and then vertical for 2 minutes. Dried at room temperature. The drying was performed to prevent dehydration caused by external force. Absorbency test is calculated using Equation 1 below.

[Formula 1]

Where m _k is the weight (g) of the dry sample and m _n is the weight (g) of the sample and the absorbed liquid after the test.

Example 1

After cutting the fiber length to 6mm and 12mm, and mixed so that the content ratio (wt%) of 6mm ramie fiber and 12mm ramie fiber is 60:40, 15% of the ramie fiber cut in 20% sodium hydroxide aqueous solution After soaking for minutes, the solution was neutralized by the addition of 30% aqueous sodium hypochlorite solution and 99% sodium thiosulfate. Next, 0.1 wt% of polyethylene oxide as a dispersant was added to disperse ramie fibers, and a wet type ramie nonwoven fabric having a weight of 25 g / m 2 was prepared through a lamination process and a compression process. The physical properties of the manufactured wet type nonwoven fabric had 0.069kgf / mm2 cutting strength, 1.80% cutting strength, 0.05g? Cm2 / cm bending strength, 319.4% water absorption rate, and 20.3% swelling property. The fibers are evenly distributed. In the compression process, the number of passes through the extrusion roller was fixed once. At this time, the rotational speed of the thermal compression roller was 17rpm.

Example 2

The content ratio (wt%) of 6 mm and 12 mm ramie fibers was prepared in the same manner as in Example 1 except that the ratio was 60:40 and the basis weight was 32 g / m 2. The wet type nonwoven fabrics produced in this way had a mechanical strength of 0.063kgf / mm2, an elongation of 1.14%, a bending strength of 0.14g? Cm2 / cm, a water absorption rate of 327.0%, and a swelling ratio of 15.6%. And the fibers are evenly distributed. At this time, the thermal compression roller was 16 rpm.

Example 3

The content ratio (wt%) of 6 mm and 12 mm ramie fibers was prepared in the same manner as in Example 1 except that the ratio was 60:40 and the basis weight was 40 g / m 2. The wet type nonwoven fabrics produced in this way had a mechanical strength of 0.081kgf / mm2, an elongation of 1.41%, a bending strength of 0.15g? Cm2 / cm, a water absorption of 306.5%, and a swelling property of 11.0%. And the fibers are evenly distributed. At this time, the rotational speed of the thermal compression roller was 15rpm.

Example 4

The content ratio (wt%) of 6 mm and 12 mm ramie fibers was prepared in the same manner as in Example 1 except that the content ratio (wt%) was 60:40 and the basis weight was 45 g / m 2. The wet type nonwoven fabrics produced in this way had 0.104kgf / mm2 cutting strength, 1.34% cutting strength, 0.29g? Cm2 / cm bending strength, 260.1% water absorption, 8.1% swellability in the machine direction. The fibers are evenly distributed. At this time, the rotational speed of the thermal compression roller was 14rpm.

Figure 3 is a graph showing the water absorption of the ramie nonwoven fabric prepared in the embodiment of the present invention. In Examples 1 to 4, samples were prepared by varying the rotational speed of the thermal compression roller in order to control the basic weight of the nonwoven fabric. Specifically, by rapidly rotating the heat extrusion roller, a low weight nonwoven fabric can be produced, and a low rotation speed can produce a high weight nonwoven fabric. When the fiber length and the content ratio of the fibers constituting the ramie nonwoven fabric are the same, it can be seen that the moisture absorption rate is changed by about 250 to 320% depending on the basis weight of the fabric of the ramie nonwoven fabric. As the basis weight is smaller, the moisture absorption rate is increased. .

According to the wet type of nonwoven fabric of the present invention, it is possible to manufacture a wet type nonwoven fabric having various basic weights and excellent uniformity according to the rotational speed control by thermal compression roller, and the prepared wet type nonwoven fabric is antibacterial, It can be widely used in various products such as mask packs and tea bags by taking advantage of biodegradability, water absorption, swellability, and simplification of process conditions.

Claims (4)

Cutting the ramie fibers to have short and long fiber lengths;
Mixing the short fibers and the long fibers of the core fibers with 70:30 to 60:40 (weight ratio) and then beating and beating;
Dispersing the beaten ramie fibers in two steps;
Forming a web by unevenly laminating the dispersed ramie fibers using a wet lamination machine; And
The laminated web is a method of manufacturing a wet type ramie nonwoven fabric comprising the step of compressing in a thermal compression roller of 80 ~ 100 ℃. The method according to claim 1, wherein the length of the short fiber-like ramie fiber is 4 to 6mm, the length of the long fiber-like ramie fiber is 10 to 12mm, characterized in that the manufacturing method of the wet ramie nonwoven fabric. The method according to claim 1, wherein the weight of the ramie nonwoven fabric is controlled by the rotational speed of the thermal extrusion roller. The method of claim 3, wherein the rotational speed of the thermal compression roller is 10 to 20 rpm.

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