KR900003634B1 - Fabric filter and its producing method - Google Patents

Abstract

A process for producing a nonwooven fabric filter comprises (a) cutting polypropylene film of 0.008-0.009 mm thickness to polypropylene filament of 0.01-0.015 mm width, (b) mfg. nonwooven fabric with irregular-direction structure by cutting the filament, (c) covering both sides of core material of the fabric with epidermal tissue of thermoplastic fiber such as polyethylene or polypropylene yarn, and (d) melt-fusing their seams. The filter has a good adsorptivity and air permeability.

Description

Nonwoven Fabric Filter and Manufacturing Method Thereof

1 is a front view illustrating a part of a nonwoven fabric filter manufactured according to one embodiment of the present invention.

2 is a cross-sectional enlarged plan view of the filter.

The present invention is excellent in the electrostatic preservation rate, excellent in the adsorption of dust, dust, etc., and also excellent in the breathability inside the tissue, the air flow is smoothly achieved, non-woven filter excellent in the damping effect, and a new manufacturing method for the production It is about.

Many of the filters widely used in dust collectors and air cleaners are made of nonwoven fabrics. Most of the nonwovens used are made of microfiber. As such, the non-woven fabric filter made of microfiber generally has the following drawbacks. In other words, due to the high density of the tissue, there are few pores in the tissue, so that ventilation is not smooth and therefore, the damping effect is low. In addition, since the fiber yarn constituting the nonwoven fabric has a circular cross section, the friction coefficient is low, and the amount of static electricity generated by friction with the air when air passes through is small, and even if the generated static electricity disappears quickly As a result, the adsorption effect of dust, dust, etc. in the air wandering around the filter did not meet expectations.

An object of the present invention is to provide abundant amounts of static electricity generated by friction when air mixed with dust, dust, and the like passes through the filter, and to keep the static electricity thus obtained permanently in the filter, and to mix the dust into the air to pass therethrough. It is to greatly improve the adsorption efficiency such as dust.

Another object of the present invention is to provide a damping effect as in the first object while still being breathable.

In order to achieve the above object, in the present invention, the fiber yarn is selected as polypropylene, wherein the polypropylene yarn is about 0.008-0.009 mm thick and 0.01-0.015 mm wide. In the case of polypropylene yarn having a thickness less than 0.008 mm Even if it is made of non-woven fabrics have a drawback similar to that of conventional microfiber, and if more than 0.009mm, such as the surface bonding between the polypropylene yarns and the polypropylene yarns, such as the surface bonding occurs, there is a problem in breathability. In the case of width, since a phenomenon similar to this is concerned, the conditions within the above range are preferable.

However, the length of the polypropylene yarn is not particularly limited, but if it is too short or long, it is difficult to form nonwoven fabric, and therefore it is generally limited to 25-67 mm. When such polypropylene yarns are heated in a state arranged in a negative direction, a nonwoven fabric made of polypropylene yarns is obtained. Since polypropylene yarn is thermoplastic, it can be easily manufactured into a nonwoven fabric only by heating. Due to the limitation of the use of filter materials, it is absolute to manufacture in a way that is not harmful to the human body and effective for preventing air pollution.

Therefore, adhesives such as starch, PVA carboxymethyl, casein alkynate, etc. are completely excluded. The nonwoven fabric thus prepared is cut into cores by use and specification, and polypropylene polyethylene or the like is formed on both sides of the core. When all the edges are heated and fused together in a state where the nonwoven fabric made of thermoplastic microfiber is faced to each other, the filter as desired in the present invention is obtained. Hereinafter, embodiments of the present invention will be described.

EXAMPLE

A polypropylene film having a thickness of 0.009 mm is cut into a tape of 0.01 mm in width and cut into a tape length of 25-60 mm and processed into a tape-like polypropylene yarn (3). The nonwoven fabric was manufactured in the well-known nonwoven fabric manufacturing machine in the middle of arranging. This is called polypropylene nonwoven fabric in this invention.

Next, the core material (1) is cut into a shape and a standard suitable for equipment mainly intended for purifying air, such as a dust collector, an air purifier or an air purifier, and the skin (2) (2) is formed on both sides of the core material (1). After returning to '), all the edges 5 of these are heat-sealed to obtain a finished filter.

Here, the skin 2 (2 ') is a nonwoven fabric made of thermoplastic fibers such as polypropylene microfiber and polyethylene microfiber. When the cross-sectional structure of the filter thus obtained is enlarged, as shown in FIG. 2, between the polypropylene yarns 3 constituting the core material 1, the microcavity 4 is long in the plane direction and short in the cross-section direction. For example, assuming that air mixed with impurities such as dust passes through the filter in the direction of the arrow, air and polypropylene when air passes through the passage 4 between each polypropylene yarn 3 Static electricity is generated due to mutual friction with the yarns (3). The static electricity at this time is generated in large quantities, and all of the generated static electricity is trapped on the passage 4, and hardly disappears. This phenomenon is largely caused by being surrounded by the epidermis 2 (2 '). Therefore, the adsorption effect of dust, dust and the like caused by the retained static electricity is greatly increased, contributing to the improvement of air purification efficiency.

In addition, the passage 4 formed in the plane direction of the polypropylene yarn 3 is relatively desired, and the air permeability is superior to that of the conventional microfiber nonwoven fabric, so that the amount of air purification per unit volume is much higher. As a result, it is possible to shorten the operating time of the air purifier using the same, as well as to reduce the operating costs.

Claims (2)

A nonwoven fabric filter comprising a nonwoven fabric core made of polypropylene having a thickness of 0.008 to 0.009 mm and a width of 0.01 to 0.015 mm, covered with a thermoplastic nonwoven fabric, and heat-sealed at its edges. A polypropylene film having a thickness of 0.008 to 0.009 mm is cut into 0.01-0.015 mm width to make a polypropylene yarn, cut into a predetermined length, and made into a nonwoven fabric having a non-directional structure, and the nonwoven fabric is cut to a predetermined size. A method for producing a nonwoven fabric filter, comprising coating a skin of thermoplastic fibers such as polypropylene microfiber and polyethylene microfiber on both surfaces of a core material and heat-sealing these edges.

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