KR20130071065A - Glass fiber fabric filters and method for manufacturing the same - Google Patents

Glass fiber fabric filters and method for manufacturing the same Download PDF

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Publication number
KR20130071065A
KR20130071065A KR1020110138376A KR20110138376A KR20130071065A KR 20130071065 A KR20130071065 A KR 20130071065A KR 1020110138376 A KR1020110138376 A KR 1020110138376A KR 20110138376 A KR20110138376 A KR 20110138376A KR 20130071065 A KR20130071065 A KR 20130071065A
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KR
South Korea
Prior art keywords
dust collecting
nonwoven fabric
collecting filter
web
scrim
Prior art date
Application number
KR1020110138376A
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Korean (ko)
Inventor
황계순
강신현
Original Assignee
재단법인 포항산업과학연구원
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Priority to KR1020110138376A priority Critical patent/KR20130071065A/en
Publication of KR20130071065A publication Critical patent/KR20130071065A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/02—Loose filtering material, e.g. loose fibres
    • B01D39/06—Inorganic material, e.g. asbestos fibres, glass beads or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
    • B01D2239/0208—Single-component fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0471—Surface coating material
    • B01D2239/0492—Surface coating material on fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/0618—Non-woven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/10—Filtering material manufacturing

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)

Abstract

PURPOSE: A nonwoven fabric dust collecting filter using glass fibers and a manufacturing method thereof are provided to improve dust collecting efficiency, strength, and heat resistance. CONSTITUTION: A nonwoven fabric dust collecting filter using glass fibers is formed of a nonwoven fabric which is coated with ceramics with a thickness of 30-100um. The nonwoven fabric includes a plurality of web layers and a scrim. In the web layers, webs of glass single fibers are alternately laminated. The scrim is formed of a steel fiber inserted between the web layers. The thickness of the glass singer fiber is 1-10 denier, and the length is 80-100 mm. The thickness of the steel fiber of the scrim is 10-50 denier. The ceramic is silica or alumina. [Reference numerals] (1) Material; (2) Mixing process; (3) Carding process; (4) Cross rapping; (5) Spunlace; (6) Calendering process; (7) Ceramic coating; (8) Postprocessing process

Description

Non-Woven Dust Collecting Filter Using Glass Fiber and Manufacturing Method Thereof {GLASS FIBER FABRIC FILTERS AND METHOD FOR MANUFACTURING THE SAME}

The present invention relates to a dust collecting filter having improved heat resistance, strength, and dust collecting performance in order to purify high-temperature exhaust gas discharged from an industrial facility, and a manufacturing method thereof.

In general, industrial facilities such as steel, incineration, cement, chemical, power generation, paper, and coke contain a large amount of dust according to the performance of the process, and if it is released into the atmosphere as it is, it causes environmental pollution such as air pollution. In addition, a dust collecting device equipped with a dust collecting filter is installed to purify and discharge the exhaust gas.

As the fiber used in the dust collecting filter, polyester fiber is the most widely used. In addition, polyethylene, polypropylene, acrylic, nylon, Nomex (NOMEX) and the like have been used. However, fibers such as polyethylene, polypropylene, acrylic, and nylon are excellent in strength and dust collection efficiency, but have poor heat resistance and thus cannot be used at high temperatures.

Conventionally, typical fibers used in the high temperature dust collecting filter may include fibers of nomex and teflon, but the fibers of nomex are generally used at a temperature of about 200 ° C. or less. In addition, the Teflon fiber is used at a temperature of about 250 ° C. or less, but in the case of Teflon, the price is so high that there is a limit to using it universally.

In order to increase the utility value of the conventional dust collecting filter made of textile materials, before passing the dust collecting filter, a pretreatment facility such as a cooling facility is installed to lower the exhaust gas temperature to a predetermined range, and then passed through the dust collecting filter or a wet type. It was necessary to use a dust collector. However, when installing a cooling facility, additional installation costs and operating costs are required, and when a wet dust collector is installed, there is a problem that additional efforts are required for post-treatment such as water treatment problems and recycling of collected dust.

According to one embodiment of the present invention, to provide a dust collecting filter that can obtain excellent strength and dust collection efficiency even at a high temperature of 300 ℃ or more.

In addition, according to one embodiment of the present invention, to provide a method for manufacturing a dust collecting filter that can obtain excellent strength and dust collection efficiency even at a high temperature of 300 ℃ or more.

The present invention relates to a dust collecting filter having excellent dust collecting efficiency, heat resistance and strength, and according to a first embodiment, includes a plurality of web layers in which webs of short glass fibers are cross laminated and a steel fiber scrim inserted between the web layers. The present invention provides a dust collecting filter having a nonwoven fabric coated with a ceramic having a thickness of 30 μm to 100 μm.

According to another embodiment of the present invention, the short glass fiber may be used having a thickness of 10 to 30 denier, the length of 80 to 100mm.

In addition, the steel fiber may be used having a thickness of 10 to 50 denier.

In addition, the ceramic may be silica or alumina.

The present invention also relates to a method for manufacturing the dust collecting filter, according to one embodiment, the step of mixing and carding short glass fibers to form a web; Stacking the plurality of webs, and inserting a scrim formed of steel fiber between the web and the web to form a laminate of the web and the scrim; Binding the laminate by a spunlace method to form a nonwoven fabric; Bonding the formed nonwoven fabric by applying heat; And impregnating the nonwoven fabric with silica sol or alumina sol to ceramic coating to a thickness of 30 μm to 100 μm.

According to the present invention, by using a ceramic coating of a glass fiber and a steel fiber scrim, a dust collecting filter having excellent dust collecting efficiency, heat resistance, and strength can be obtained.

1 is a process diagram schematically showing an example of a method of manufacturing a nonwoven fabric for a hot gas dust collecting filter according to the present invention.

The present invention is to provide a dust collecting filter having high dust collection efficiency and high heat resistance. To this end, the present invention provides a dust collecting filter formed of a non-woven fabric coated with a ceramic, comprising a plurality of web layers cross-laminated webs of short glass fibers and a scrim of steel fibers inserted between the web layers.

The dust collecting filter may be formed of a nonwoven fabric formed of a plurality of web layers in which a web formed of short glass fibers is cross laminated. The short glass fibers used for the web is not limited thereto, but it is preferable to use short glass fibers of 10 to 30 denier in consideration of the strength and the dust collection efficiency of the dust collecting filter obtained thereby.

In addition, although the glass short fiber of the said web is not specifically limited, what has a length of 80 mm or more and 100 mm or less can be used in consideration of strength, dust collection efficiency, manufacturing convenience, etc.

The dust collecting filter of the present invention is preferably formed of a nonwoven fabric using the short glass fibers as described above in terms of improving the dust collecting efficiency. The nonwoven fabric of the dust collecting filter may be obtained by a general nonwoven fabric manufacturing method by laminating these webs after forming webs using the short glass fibers.

The nonwoven fabric may have a scrim inserted between the laminates of the web to reinforce the strength. The scrim may be formed of steel fiber, and when the scrim formed of such steel fiber is laminated between web laminates, the strength of the nonwoven fabric is improved, and thus the strength required by the dust collecting filter may be secured.

The steel fibers forming the scrim may be those having a thickness generally applied in the manufacture of the nonwoven fabric, and are not particularly limited, but, for example, those in the range of 10 to 50 denier may be used.

In general, glass fibers do not have high heat resistance, and therefore can be used at 250 ° C or lower in general. However, heat resistance can be improved by coating the surface with ceramic for such glass fibers. As the ceramic material capable of coating the glass fiber, it is preferable to use silica or alumina. As described above, by coating the nonwoven fabric of the glass fiber using silica or alumina, heat resistance that can withstand high temperatures of 300 ° C. or higher can be ensured.

As described above, a glass fiber nonwoven fabric is coated with a ceramic to obtain a dust collecting filter having excellent heat resistance. By using such a dust collecting filter, dust collecting fabrics made of fibers such as polyethylene, polypropylene, acrylic, and nylon generally used in the past are used. Compared with the filter, excellent heat resistance can be ensured, and the cost can be reduced compared to the dust collecting filter made of Teflon fiber.

Next, a method of manufacturing the dust collecting filter according to the present invention will be described with reference to FIG. 1. 1 is a view schematically showing a method of manufacturing a dust collecting filter.

The dust collecting filter may be manufactured by laminating a plurality of webs formed of short glass fibers and ceramic coating a nonwoven fabric formed by laminating a scrim between the web laminates.

The nonwoven fabric used to form the dust collecting filter of the present invention can be obtained by a nonwoven fabric manufacturing method which is commonly used, and cross-laminates webs formed from the short glass fibers, inserts a scrim between the web layers, and then It can be produced by binding the scrim with a heat calendar and ceramic coating.

The binding between the web laminate or the web laminate and the scrim may be performed by needle punching, but when the needle punching method is performed, the breakage of the fiber may occur and the strength may be weakened, and the needle may be broken due to the scrim formed of the steel fiber. As this may occur, it is more preferable to carry out by the spunlace method. Since the spunlace method binds the web and the scrim with the pressure of water when forming the nonwoven fabric, it is possible to prevent a decrease in strength due to breakage of the needle or breaking of the fiber. The spunlace method can be generally carried out by a method used in manufacturing a nonwoven fabric, and will not be described in detail herein.

As the ceramic coating material used in the present invention, silica (SiO 2 ) or alumina (Al 2 O 3 ) having excellent heat resistance may be used, but the present invention is not limited thereto, and a suitable material capable of securing heat resistance of the dust collecting filter. Can be used. Silica or alumina is prepared in the form of a sol solution, and the nonwoven fabric is impregnated into silica sol or alumina sol to perform surface coating. At this time, the degree of surface coating is not particularly limited, but is preferably coated with a thickness of 30㎛ 100㎛. If the ceramic is coated less than 30㎛, it is not possible to secure the heat resistance required for the dust collecting filter, and if the thickness is more than 100㎛ it can not secure the air permeability required in the dust collecting filter by blocking the pores on the filter surface.

The present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto.

Example 1

A web was formed by feeding glass short fibers having an average thickness of 10 denier and an average fiber length of 50 mm by feeding the carding machine to carding. On the other hand, using a steel fiber having an average thickness of 30 denier, a scrim of warp 50x50 and weft 10x10 was woven.

The two webs thus obtained were laminated, and after the scrim was interposed between the web laminates, the web and the scrim were bound by a spunlace method. Thereafter, the web and the scrim laminate were heated and calendered to produce a nonwoven fabric.

Silica sol for coating was prepared by mixing a mixture of silica suspension (silica content 30%), ethanol and water in a weight ratio of 1: 1: 1. Thereafter, ethylenediamine as a crosslinking agent was added to the prepared silica sol, followed by stirring for 2 hours or more to prepare a coating solution. The surface was coated by impregnating a non-woven fabric prepared in the silica sol coating solution prepared as described above. Surface coating was performed for 10 minutes at 30 ℃. The coated nonwoven fabric was first dried at room temperature for 30 minutes and secondly dried at 80 ° C. for 30 minutes to produce a final nonwoven fabric. As described above, the glass fiber of the nonwoven fabric coated with silica was analyzed by a shape analyzer (SEM), and it was confirmed that the silica was coated with a thickness of about 50 μm.

Through the above process, a nonwoven fabric having a weight of 650 g / m 2 was prepared.

Using the obtained nonwoven fabric, the dust collecting filter of diameter 150mm and length 2000mm was manufactured.

The tensile strength and air permeability of the obtained dust collecting filter were measured. The measurement of the physical properties was carried out in the following method after maintaining for 24 hours in a high temperature furnace of 300 ℃.

Tensile Strength: KSK 0520

Air Permeability: KSK 0750DP

As a result, the air permeability was 15.2 cm / s and the tensile strength was 110 kg / cm 2.

The tensile strength and air permeability required for the dust collecting filter are slightly different depending on the process characteristics in which the dust collecting filter is used. Generally, the characteristics of the tensile strength of 80 kg / cm 2 or more and the air permeability of 5 to 17 cm / s are required.

As can be seen from the above measurement results, the dust collecting filter using the glass fiber obtained by the present example has a tensile strength requirement of 80 kg / cm 2 or more, air permeability of 5 or more, which is required for the dust collecting filter even under conditions of a temperature of 300 ° C. It can be seen that the value of ~ 17 cm / s, it has been found that the filter life and efficacy have very excellent characteristics.

[Example 2]

This embodiment is to confirm the dust collection performance of the exhaust gas of the dust collecting filter, four filters prepared in Example 1 was mounted on a pulse-jet type filter dust collector was tested three times.

The exhaust gas containing dust was injected into the bag filter. The exhaust gas used at this time was used as an air composition, including the dust generated in the sintering process of an average particle size of 29.2㎛, a specific gravity of 3.3g / ㎠. Inlet concentration of the dust collector 3g / N ㎥, inlet gas temperature room temperature, the dust removal cycle 10 minutes, the dust removal pressure was tested at 5 atm.

The measurement of dust collection efficiency was calculated by measuring the concentration at the inlet and the outlet of the dust collector using the gravimetric method.

As a result of the measurement under the conditions of the above dust collection experiment, the filtration rate was 1.5m / min and the dust collection efficiency was 98.3%, 98.8% and 98.5%, respectively. In general, the dust collection efficiency of the dust collecting filter is generally required to be 97 ~ 99% or more. As can be seen from the experimental results, the obtained dust collecting filter showed a high dust collecting efficiency of 98% or more.

From these results, it is expected that the dust collecting filter made of glass fiber according to the present invention can be very usefully applied to the hot gas dust collecting process occurring in the industrial field.

Claims (5)

A dust collecting filter comprising a nonwoven fabric coated with a ceramic having a thickness of 30 μm to 100 μm, the surface comprising a plurality of web layers in which webs of short glass fibers are laminated and a steel fiber inserted between the web layers. The dust collecting filter according to claim 1, wherein the glass short fibers have a thickness of 10 to 30 denier and a length of 80 to 100 mm. The dust collecting filter according to claim 1, wherein the steel fiber has a thickness of 10 to 50 denier. The dust collecting filter of claim 1, wherein the ceramic is silica or alumina. Mixing and carding short glass fibers to form a web;
Stacking the plurality of webs, and inserting a scrim formed of steel fiber between the web and the web to form a laminate of the web and the scrim;
Binding the laminate by a spunlace method to form a nonwoven fabric;
Bonding the formed nonwoven fabric by applying heat; And
Impregnating the nonwoven fabric with silica sol or alumina sol, the method of manufacturing a dust collecting filter comprising ceramic coating to a thickness of 30 μm to 100 μm.
KR1020110138376A 2011-12-20 2011-12-20 Glass fiber fabric filters and method for manufacturing the same KR20130071065A (en)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101671994B1 (en) 2015-07-21 2016-11-16 주식회사 이앤에치 Complex filter media comprising glass media and melt-blown media
US10399026B2 (en) 2016-02-05 2019-09-03 Hyundai Motor Company Long-life air filter for automobiles and method of manufacturing the long-life air filter
KR102325976B1 (en) * 2020-10-16 2021-11-15 (주) 세라컴 Filter coating composition for fine dust reduction, fine dust reduction filter and manufacturing method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101671994B1 (en) 2015-07-21 2016-11-16 주식회사 이앤에치 Complex filter media comprising glass media and melt-blown media
US10399026B2 (en) 2016-02-05 2019-09-03 Hyundai Motor Company Long-life air filter for automobiles and method of manufacturing the long-life air filter
KR102325976B1 (en) * 2020-10-16 2021-11-15 (주) 세라컴 Filter coating composition for fine dust reduction, fine dust reduction filter and manufacturing method thereof

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