KR100282948B1 - Manufacturing method of hygroscopic spunbond nonwoven fabric - Google Patents

Abstract

The present invention is a spunbond nonwoven fabric manufacturing method for supplying a hygroscopic material into the running filament immediately after passing through the draw-induced zone when manufacturing the spunbond nonwoven fabric, the hygroscopic material is passed through the stretched zone in the sieve mixed with the downdraft At the same time, the hygroscopic material is evenly mixed between the filaments.

The present invention can be applied to the existing manufacturing apparatus can be produced inexpensive hygroscopic spunbond nonwoven fabric by a very simple manufacturing process, it is excellent in physical strength and can be used in industrial wipers and the like with excellent absorption.

Description

Manufacturing method of hygroscopic spunbond nonwoven fabric

The present invention relates to a method of manufacturing a spunbond nonwoven fabric having excellent hygroscopicity, wherein a pulp or a superabsorbent polymer having excellent hygroscopicity is incorporated in a spinning step of manufacturing a general spunbond nonwoven fabric to absorb an overall absorbent material within the spunbond nonwoven web. The non-woven web is uniformly dispersed, and the hygroscopic material is stably occupied in the spunbond nonwoven web by fixing the nonwoven web by heat treatment such as embossing, so that the strength is higher than that of a conventional hygroscopic nonwoven fabric such as an industrial wiper. A method for producing an absorbent spunbond nonwoven fabric that is remarkably improved and is significantly cheaper.

Nonwoven fabric is used as a very important material in modern industry because of its excellent form stability and the ability to design various products. Among them, spunbonded nonwoven fabrics using synthetic polymers and melting / spinning techniques are attracting attention because of their excellent mechanical properties, but are limited in their use due to the hydrophobic properties of raw materials such as polypropylene and polyester.

Especially in the field of industrial wipers which require excellent hygroscopicity and high physical properties, the wiper using only wood pulp has been the mainstream, but this is due to the excellent hygroscopic property of wood pulp, which has good hygroscopicity but the price is high. The use of large quantities of expensive wood pulp has the disadvantage of being uneconomical and of low strength.

In addition, in order to improve the disadvantages of the industrial wiper consisting of only the wood pulp as described above and to improve the price competitiveness, research and commercialization of the nonwoven fabric and the wood pulp are in progress. -There is a composite of nonwovens of synthetic pulp and wood pulp as presented in 9658. The method produces a two-layer structure in which a moisture absorption layer made of wood pulp is separately formed on a non-woven fabric made of synthetic fibers or a three-layer structure such as laminating a non-woven fabric thereon, and then fixing the thermal bonding method. It is a method of manufacturing through a step. The method manufactured by this method has the advantage of improving the physical properties of the product compared to the material manufactured using only conventional wood pulp. However, this method requires the use of a non-woven fabric manufactured separately for the manufacture of the product, and forms a wood pulp layer in the middle. There is a problem in that the manufacturing process is complicated and the manufacturing cost is expensive because a separate lamination process and a separate process for compressing the composite web are required.

In addition, U.S. Patent No. 4,100,324 is a method of applying a melt blown nonwoven fabric, which melts a secondary air stream containing wood pulp separately from an air supply for producing a meltblown nonwoven fabric. By supplying in the same direction as the traveling direction of the tumbled fibers, the primary air stream for producing the meltblown and the secondary air stream containing the wood pulp are mixed before the nonwoven web is laminated so that the wood pulp particles are in the meltblown nonwoven web. Is to mix. However, when the method is used in a series of spinning processes, it is necessary to supply a high temperature and high pressure air above the spinning temperature in order to stretch the fiber during spinning due to the meltblown process characteristics for manufacturing the product. Due to the excessive installation and operation costs required by the need for a device such as an air heater and a high-capacity compressor for supplying air at high pressure, the manufacturing cost increases and the low mechanical properties of the manufactured nonwoven web There was a problem in that it is difficult to use in industrial wipers requiring strength.

The present invention uses a spunbond nonwoven fabric having excellent mechanical strength as a matrix, and incorporates a hygroscopic material such as wood pulp during the spinning process, thereby making it possible to manufacture a non-woven fabric having excellent hygroscopicity at a low cost, and is suitable for use as a wiper. It is an object to provide a nonwoven product with physical strength.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing of the manufacturing process of the hygroscopic spunbond nonwoven fabric of this invention.

2 is a cross-sectional view of the hygroscopic spunbond nonwoven fabric of the present invention.

〈Code Description of Main Parts〉

1: spinneret, 2: cooling zone, 3: additional air supply zone, 4: extension induction zone,

5: stretched area, 6: web forming area, 7: moving screen, 8: suction damper,

9: embossing roller, 10: winder, 11: hygroscopic material supply device,

12: filament constituting the spunbond, 13: hygroscopic material.

The present invention will be described in detail with reference to FIG. 1 as compared with the conventional method.

Most of FIG. 1 describes the manufacturing process of the spunbond nonwoven fabric, wherein the polymer melt-extruded from the spinneret 1 is cooled / solidified by the action of the cooling airflow supplied from the cooling zone 2 and then the additional air supply zone. The stretching orientation is completed by passing through the drawing induction region 4 by the action of the additional air flow supplied from (3) and then through the drawing region 5 in the form of a slot. Thereafter, in the web forming area 6, the open air is generated in the stretched filament due to the rapid decrease in the air traveling speed, and the nonwoven web is formed by being stacked on the moving screen 7 on which the suction damper 8 is installed. The nonwoven web formed in this way is subjected to a fiber-to-fiber bonding process through a conventional embossing roller 9 or a water flow bonding method according to the purpose of use, and then wound through a winder 10 to produce a final nonwoven web. Therefore, in order to manufacture a hygroscopic nonwoven product using a conventional spunbond nonwoven fabric manufacturing process, a nonwoven web such as a pulp manufactured separately or another functional addition material may be manufactured separately and supplied separately before a bonding process such as embossing, or There is a disadvantage in that a separate process must be performed between the spunbond nonwoven fabric and the pulp layer.

In the present invention, as shown in Figure 1 by attaching a hygroscopic material supply device 11 capable of supplying a hygroscopic material (wood pulp, etc.) separately on a manufacturing facility by utilizing the existing spunbond manufacturing apparatus as it is spinning process Since it is possible to supply a hygroscopic material in the air, a separate hygroscopic material addition process is not required, and additionally, the hygroscopic material added is evenly distributed among the individual filaments constituting the nonwoven web, thereby providing a nonwoven fabric having uniform hygroscopicity and strength. It can be manufactured easily.

In more detail, the hygroscopic material supplied from the supply device 11 of the hygroscopic material meets the air passing through the stretching induction zone 4, wherein the hygroscopic material is mixed / dispersed in the air by the action of the air stream, At the same time, a mixed air stream in which the hygroscopic material is uniformly dispersed is formed, and this flows into the drawing zone 5 to participate in the drawing process of the traveling filament. At this time, the mixed airflow is evenly distributed between the filaments to reach the web formation region (6).

Thereafter, the hygroscopic material remains on the web while being separated from the air on the moving screen 7 on which the suction damper 8 is installed, and the air flows out through the lower suction damper 8 so that only the non-hygroscopic material is the entire nonwoven web. The spunbond nonwoven web in which the hygroscopic material is incorporated through the embossing roller 9 is produced in this state and is evenly dispersed throughout, and wound up in the winder 10.

Example

In preparing a conventional spunbond nonwoven fabric by melting the polypropylene polymer (MI = 35) at 230 ° C., the unit weight was 50 g / m ² , and the production rate was prepared at 120 m / min. At this time, the average length of the wood pulp used was about 0.1 mm, and the pulp was supplied at a weight of 10% by weight relative to the total polypropylene discharge.

The physical properties of the nonwoven fabric thus prepared are shown in Table 1, and the measurement of the physical properties of the fabric made of nonwoven fabric was made 5 cm long and 20 cm long, and the tensile speed was 10 cm / min. The time taken for the sample to fully wet was measured and evaluated.

Comparative Example 1

Spunbond nonwoven fabric was produced under the same conditions as in Example 1 without supplying pulp, but the unit weight was 48 g / m ² , and the physical properties of the nonwoven fabric were shown in Table 1.

Comparative Example 2

The meltblown nonwoven web was composed of a top and a bottom, and a triple nonwoven fabric was prepared in which a separate pulp web was placed in the middle. The unit weight thereof was 71 g / m ² , and the physical properties thereof are shown in Table 1 below. .

Item Unit weight (g / ㎡) Tensile Strength (kg / 5cm) Wet Strength (kg / 5cm) Elongation (%) Hygroscopicity (sec) MD CD MD CD MD CD Example 50 19.5 14.2 14.1 9.8 28.1 32.4 0.8 Comparative Example 1 48 20.3 15.1 15.2 10.8 29.2 33.1 More than 100 Comparative Example 2 71 1.4 0.9 0.6 0.28 43.1 45.3 2.1

The present invention does not require a separate manufacturing process of the hygroscopic nonwoven web and the mixing process of each nonwoven web, so that the productivity can be improved and the manufacturing process cost can be reduced, and the product can be manufactured with significantly improved hygroscopic strength.

In addition, the nonwoven fabric manufactured by the present invention has an excellent cleaning property because the surface of the product is dense because the hygroscopic material is mixed between the individual filaments of the nonwoven web, and thus has excellent absorption ability such as dust or oil and does not slip.

The present invention also has the advantage that the product design is easy to adjust the degree of mixing of the hygroscopic material freely.

Claims (1)

In manufacturing the spun bond nonwoven fabric, the hygroscopic material 13 is supplied from the lateral direction to the traveling filament bundle immediately after passing through the stretch induction zone 4, and the supplied hygroscopic material 13 is supplied. A method of manufacturing a hygroscopic spunbond nonwoven fabric, characterized in that the filament (12) is dispersed between the filaments (12) while passing through the stretching region (5) together with the downdraft.