KR20020007042A - Gas filter manufactured with fine yarn - Google Patents

Abstract

PURPOSE: A bag filter is provided which collects fine dust, easily separates dust, and has low pressure loss and a high strength during dust collection. CONSTITUTION: The fine yarn bag filter comprises a base cloth which is woven with 250 to 1300 denier polyester; a first nonwoven fabric which is manufactured by needle punching 0.7 to 6 denier polyester monofilament on one surface of the base cloth; and a second nonwoven fabric which is manufactured by needle punching 0.5 to 1 denier polyester monofilament or 0.5 to 1 denier nylon monofilament on the other surface of the base cloth, wherein the base cloth is woven with 1000 denier polyester, wherein the first nonwoven fabric is manufactured of one or more monofilaments selected from the group consisting of 2 denier polyester monofilament and 3 denier polyester monofilament, and wherein the second nonwoven fabric is manufactured of 0.7 denier polyester monofilament.

Description

Gas filter manufactured with fine yarn

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas filter, and more particularly, to a bag filter installed in dust collectors of all industrial sites where dust is generated, such as chemical, steel, and cement industries.

This bag filter has a narrow, elongated bag shape and is used by being fitted in a bag cage in a dust collector. If dust is deposited to some extent on the surface of the bag filter and the pressure loss (differential pressure) is increased, the dust is blown off by compressed air (dedusted) and then collected again.

The threshold for dust at industrial sites where dust is generated is becoming increasingly stringent. In the case of smelters, for example, the limit was 20 mg / m ³ before 1999, but has since been strengthened to 10 mg / m ³ . Therefore, to meet these limits, a bag filter capable of filtering even finer dust is needed.

However, it is difficult to meet these acceptance criteria with conventional bag filters. The material of the surface of the bag filter which is in direct contact with the outside air is mainly a nonwoven fabric because the nonwoven fabric having a large pore is used as the nonwoven fabric. In this case, when the pores on the surface of the bag filter are large, fine dust cannot be collected, and dust is deeply embedded in the filter surface (because the first adhesion layer of dust is formed thick), which makes it difficult to exhaust dust and increases the differential pressure.

In the bag filter, air moves in one direction when dust is collected, and compressed air moves in the opposite direction when dust is collected. At this time, since the bag filter itself expands inward or outward according to the moving direction of the air, the bag filter requires a certain degree or more of strength. However, the conventional bag filter has a disadvantage of lacking such strength.

An object of the present invention is to provide a bag filter capable of collecting fine dust, easy dust removal, small differential pressure during dust collection, and high strength.

Gas filter using a fine yarn according to the present invention to achieve the above object is a bubble woven from 250 ~ 1300 denier polyester yarn; A first nonwoven fabric manufactured by needle punching 0.7 to 6 denier polyester short fibers on one surface of the bubble; And a second nonwoven fabric manufactured by needle punching 0.5 to 1 denier polyester short fiber or 0.5 to 1 denier nylon short fiber on the other surface of the bubble.

Hereinafter, the present invention will be described in detail with reference to specific embodiments.

The gas filter using the fine yarn of the present invention is manufactured by a needle punching method. Looking at the manufacturing process is as follows.

Carding and cross lapping 0.7 to 6 denier polyester short fibers in accordance with a conventional nonwoven fabric manufacturing process to form a web and then pre-punching for morphological stability do. The prepunched web is main punched on one surface of a fabric woven from 250 to 1300 denier polyester yarns to be compounded (hereinafter, the resultant product is referred to as a 'bubble-first nonwoven composite'). do).

0.5-1 denier polyester short fibers or 0.5-1 denier nylon short fibers are also prepunched for form stability after carding and cross-lapping to form a web according to a conventional nonwoven fabric manufacturing process. The bubble-first nonwoven composite is turned upside down to composite the prepunched web on the other side of the bubble by main punching (hereinafter, the nonwoven fabric main punched in the bubble-first nonwoven composite is referred to as 'second nonwoven').

Thereafter, the product is completed by ordinary post-processing treatment (for example, water repellent treatment).

Examples of the 0.7 to 6 denier polyester short fibers as the raw material of the first nonwoven fabric include 0.7 denier, 1.4 denier, 2 denier and 3 denier polyester short fibers, but are not limited thereto. These may be used alone or in combination of two or more. It is preferable to use 2 denier and 3 denier polyester short fibers individually or in mixture.

0.5-1 denier polyester short fiber or 0.5-1 denier nylon short fiber is used as a raw material of the second nonwoven fabric. It is preferred to use 0.7 denier polyester short fibers, in which case it is possible to collect dust up to 1 μm in size. Conventionally, what used 2 denier and 3 denier polyester short fibers individually or in mixture was used. In this case, the pores on the surface of the bag filter were large, making it difficult to collect fine dust, and the dust was deeply embedded (because the first adhesion layer of the dust was formed thick), making it difficult to exhaust and having a large differential pressure.

As the bubble, one woven from 250 to 1300 denier polyester yarn is used. It is preferable to use those woven with 1000 denier polyester yarns. Conventionally, there is a problem in the strength of the bag filter using bubbles woven from 300 denier polyester yarn.

Example

A bag filter was manufactured according to the above-described manufacturing process. The bubble used was 1000 denier polyester yarn, which was woven so that the bubble density (tilt x weft) became 17x16. As a raw material of the first nonwoven fabric, a mixture of 2 denier and 3 denier polyester short fibers was used. 0.7 denier polyester short fibers were used as a raw material for the second nonwoven fabric. After needle punching was completed, water-repellent treatment was performed with polytetrafluoroethylene (PTFE).

Physical properties of the manufactured bag filter are shown in the following table.

Comparative example

A bag filter was manufactured according to the above-described manufacturing process. Bubbles were 300 denier polyester yarns that were woven so as to have a bubble density (tilt x weft) of 44 x 27. As a raw material of the first nonwoven fabric and the second nonwoven fabric, a mixture of 2 denier and 3 denier polyester short fibers was used. After needle punching was completed, water-repellent treatment was performed with polytetrafluoroethylene (PTFE).

Physical properties of the manufactured bag filter are shown in the following table.

table

division unit Example Comparative example Note ^* weight g / ㎡ 600.0 603.0 KS K 0514 thickness mm 1.9 2.2 KS K 0506 Aeration Cm 3 / cm 2 · sec 10.0 17.0 KS K 0570 The tensile strength Length kgf 160.0 84.3 KS K 0520CUT STRIP width 160.0 156.2 Tensile elongation Length % 26.0 26.2 width 34.0 37.5 5% Elongation Strength Length kgf 42.1 19.9 width 18.9 6.3 10% elongation at break Length kgf 65.8 35.0 width 47.9 12.3 Heat shrinkage slope % 0.1 4.0 150 ° C, 30 minutes Weft 0.1 1.7 Water repellency - 90 90 KS K 0590

* KS K value means KS test standard.

It can be seen from the table that the pores of the bag filter of the example are smaller than those of the comparative example from the air permeability. In the examples, since the bubbles were made of yarns having a larger fineness than the comparative example, it can be seen that the tensile strength is larger, the tensile elongation is slightly smaller, and the elongation strength is considerably larger.

The gas filter using fine yarns according to the present invention can collect fine dusts, facilitate dust removal, and have a small differential pressure at the time of dust collection and a high strength.

Claims (4)

Bubbles woven from 250 to 1300 denier polyester yarns; A first nonwoven fabric manufactured by needle punching 0.7 to 6 denier polyester short fibers on one surface of the bubble; And A gas filter using a fine yarn composed of a second nonwoven fabric manufactured by needle punching 0.5 to 1 denier polyester short fiber or 0.5 to 1 denier nylon short fiber on the other surface of the bubble. According to claim 1, wherein the bubble is a gas filter using a fine yarn, characterized in that weaving with 1000 denier polyester yarn. The gas filter using a fine yarn according to claim 1, wherein the first nonwoven fabric is made of at least one selected from the group consisting of 2 denier polyester short fibers and 3 denier polyester short fibers. The gas filter using a fine yarn according to claim 1, wherein the second nonwoven fabric is made of 0.7 denier polyester short fibers.