KR102437428B1 - Cylindrical chemical filter and method of manufacturing the same - Google Patents

Abstract

Cylindrical chemical filters of the embodiments of the present invention are bent in a zigzag pattern to form a filter media in which outer and inner bent parts are alternately repeated, foam melt formed along the periphery of the filter media, and a plurality of vents on the wall surrounding the outside of the filter media and a cover for closing the upper and lower portions of the space formed between the outer tube, the inner tube disposed inside the filter media and having a plurality of vents formed on the wall surface, and the outer tube and the inner tube. The spacing between the bends is effectively fixed, so that the filtering performance is improved.

Description

Cylindrical chemical filter and manufacturing method thereof

The present invention relates to a cylindrical chemical filter and a method for manufacturing the same. More particularly, it relates to a cylindrical chemical filter including a filter media and a method for manufacturing the same.

Chemical filters are used in precision manufacturing fields such as semiconductor, display, and machine assembly industries. Precision manufacturing is carried out in a clean room where contaminants such as dust are minimized. At this time, if chemical contaminants such as acid gas (NOx, SOx, HCl, HF, organic acid, etc.), basic gas (NH3, amines, etc.), organic sulfur compounds, and VOCs are present in the air inside the clean room, the defective rate of the product will decrease. can increase Chemical filters can be used to remove chemical contaminants from the air inside a clean room.

In general, a chemical filter is manufactured by coating or filling a support with an adsorbent such as a polymer resin or a carbon-based material. Chemical contaminants are removed from the air by the adsorption action of the adsorbent. The contaminants are removed using the adsorption action of the polymer resin or carbon-based material bonded to the support.

Korean Patent Application Laid-Open No. 10-2014-0072083 discloses a technique in which a wavy separator is inserted between a plurality of filter media bent in a zigzag shape. The separator is used to maintain an interval between a plurality of filter media, but it has a rectangular shape when viewed in the longitudinal direction of the filter paper. There is a problem in that the process defect rate is high.

Korean Patent Publication No. 10-2014-0072083

One object of the present invention is to provide a cylindrical chemical filter having excellent durability and performance.

One object of the present invention is to provide a method for manufacturing a cylindrical chemical filter having excellent durability and performance.

1. A filter media having a hollow cylinder shape, including an outer bend and an inner bend that are bent in a zigzag and are alternately repeated; a foam melt formed along an outer perimeter and an inner perimeter of the filter media; an outer tube surrounding the outside of the filter media and having a plurality of vents formed on the wall surface; an inner tube disposed inside the filter media and having a plurality of vents formed on the wall surface; and an upper cover and a lower cover respectively closing upper and lower portions of a space formed between the outer tube and the inner tube.

2. The above 1, wherein the space between the adjacent outer folds is defined as an outer pleat space, and the space between the adjacent inner folds is defined as an inner pleat space, and the foam melt has the outer pleat space and the inner pleat space. A cylindrical chemical filter inserted into space.

3. The cylindrical chemical filter according to 2 above, wherein the foam melts formed on both sidewalls of the outer pleat space contact each other, and the foam melts formed on both sidewalls of the inner pleat space contact each other.

4. The cylindrical chemical filter according to 3 above, wherein the foam melt is not formed in the outer bent portion and the inner bent portion.

5. The cylindrical chemical filter according to the above 2, wherein the average spacing of the outer pleated spaces is 3 to 30 mm, and the average spacing of the inner pleated spaces is 1 to 15 mm.

6. The cylindrical chemical filter of 1 above, wherein the foam melt comprises a polyolefin-based resin.

7. The cylindrical chemical filter of 1 above, wherein the foam melt has a foaming rate of 20 to 200%.

8. The cylindrical chemical filter according to the above 1, wherein the foam melt is formed in a plurality of lines parallel to each other on the filter media, and the distance between the lines is 10 to 300 mm.

9. The cylindrical chemical filter according to the above 1, wherein the filter media has an adsorption layer comprising an adsorption material adhered by hot melt between the upper nonwoven substrate and the lower nonwoven fabric.

10. The cylindrical chemical filter according to 9 above, wherein the adsorption material includes activated carbon or an adsorbent resin.

11. The cylindrical chemical filter according to the above 1, wherein the foam melt fixes the gap between the adjacent outer bent parts and the gap between the adjacent inner bent parts.

12. alternately bending the media body upward and downward to form a preliminary bend including an outer preliminary bent portion and an inner preliminary bent portion; developing the preliminary bent part; applying the foam melt to both sides of the developed media body along the longitudinal direction; forming a filter media by bonding both ends in the longitudinal direction while bending the media body coated with the foam melt along the preliminary bending portion again; curing the foam melt to fix the shape of the filter media; and placing the filter media in a filter frame.

13. The method for manufacturing a cylindrical chemical filter according to the above 12, wherein the foam melt comprises a polyolefin-based resin having a foaming rate of 20 to 200%.

14. The cylindrical shape of the above 12, wherein the step of applying the foam melt comprises alternately applying the foam melt to the outer pre-bent portion of one surface and the inner pre-bent portion of the other surface of the deployed filter media. A method for manufacturing a chemical filter.

15. The method for manufacturing a cylindrical chemical filter according to the above 12, wherein the step of applying the foam melt comprises applying the foam melt to a portion other than the developed pre-bent portion.

16. The method for manufacturing a cylindrical chemical filter according to the above 12, wherein the forming of the preliminary bent portion includes forming the outer preliminary bent portion and the inner preliminary bent portion with an average interval of 2 to 20 mm.

17. The method of manufacturing a cylindrical chemical filter according to the above 12, wherein the step of applying the foam melt comprises leaving the applied foam melt at 10 to 25° C. for 5 seconds to 5 minutes.

18. The method of manufacturing a cylindrical chemical filter according to the above 12, wherein the filter media is formed by laminating an adsorption layer comprising an adsorption material adhered by hot melt between the upper nonwoven substrate and the lower nonwoven substrate.

In the cylindrical chemical filter according to exemplary embodiments, a gap between the bent portions is fixed by a foam melt. In this case, the pleat gap can be stably fixed even while the chemical filter is being used or transported, and a large surface area of the filter media can be maintained. Accordingly, the filtering performance and durability of the chemical filter may be improved.

According to exemplary embodiments, by using the polyolefin-based foaming resin as the foam melt, high temperature durability and impact resistance may be improved, and the weight of the chemical filter may be reduced.

1 is a schematic exploded perspective view showing a cylindrical chemical filter according to exemplary embodiments.
FIG. 2 is a schematic cross-sectional view showing a section A of the filter media shown in FIG. 1 .
3 is a schematic cross-sectional view of a media body according to exemplary embodiments;
4 and 5 are schematic cross-sectional views illustrating portions of filter media according to exemplary embodiments.
6 is a schematic flowchart illustrating a method of manufacturing a cylindrical chemical filter according to exemplary embodiments.
7 to 9 are schematic plan views illustrating a method of forming filter media according to exemplary embodiments.
10 and 11 are graphs showing differential pressure measurement results for chemical filters according to Examples and Comparative Examples.

Exemplary embodiments of the present invention include a filter media formed by alternately repeating an outer bent portion and an inner bent portion, a foam melt applied to the filter media, an outer tube and an inner tube having a plurality of vents formed therein, an upper cover and a lower cover, , provides a cylindrical chemical filter with improved durability and filtering performance. Exemplary embodiments of the present invention provide a method for manufacturing a cylindrical chemical filter.

Hereinafter, with reference to the drawings, an embodiment of the present invention will be described in more detail. However, the following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the above-described content of the present invention, so the present invention is described in such drawings It should not be construed as being limited only to the matters.

1 is a schematic exploded perspective view showing a cylindrical chemical filter according to exemplary embodiments.

Referring to FIG. 1 , the cylindrical chemical filter 10 includes a filter media 100 , an outer tube 210 , an inner tube 220 , an upper cover 230 , and a lower cover 240 .

The outer tube 210 may surround the outside of the filter media 100 . For example, the inner surface of the outer tube 210 may at least partially contact the filter media 100 . The outer tube 210 may fix the shape of the filter media 100 .

As used herein, the term “outside” may mean the outside of the tube of the filter media 100 , and “inside” may mean the inside of the tube of the filter media 100 .

The outer tube 210 may include a plurality of vents on the wall. The vent (first vent) may pass air from the outside of the cylindrical chemical filter 10 to the filter media 100 . The first vent may physically filter out foreign substances larger than the diameter. The physical filtering level of the outer tube 210 may be adjusted by adjusting the size of the first vent.

For example, the outer tube 210 may include a first outer tube 212 and a second outer tube 214 . The first outer tube 212 and the second outer tube 214 may be combined to form the outer tube 210 .

The inner tube 220 may be disposed inside the filter media 100 . The filter media 100 may be disposed in a space defined between the outer tube 210 and the inner tube 220 . The outer surface of the inner tube 220 may at least partially contact the filter media 100 . The inner tube 220 may fix the shape of the filter media 100 together with the outer tube 210 . Accordingly, even if the cylindrical chemical filter 10 is subjected to an external impact during use or transport, the overall shape and pleat spacing of the filter media 100 can be substantially fixed.

The inner tube 220 may include a plurality of vents on the wall. The vent (second vent) may pass the air passing through the filter media 100 to the inside of the inner tube 220 . The air passing through the inner tube 220 may proceed to the lower portion of the cylindrical chemical filter 10 (see FIG. 1 ).

The upper cover 230 may close the upper portions of the outer tube 210 and the inner tube 220 . The upper cover 230 may allow external air to flow into the side of the cylindrical chemical filter 10 through the outer tube 210 .

For example, the top cover 230 may contact the top of each of the outer tube 210 , the inner tube 220 , and the filter media 100 . In this case, the air flowing into the cylindrical chemical filter 10 may pass through the filter media 100 without a gap.

The lower cover 240 may close the lower portion of the space formed between the outer tube 210 and the inner tube 220 . The lower cover 240 may not close the lower portion of the inner tube 220 . Accordingly, the air introduced into the cylindrical chemical filter 10 may be discharged to the lower portion of the inner tube 220 .

For example, the lower cover 240 may contact the lower portion of each of the outer tube 210 , the inner tube 220 , and the filter media 100 . For example, the height direction of the space defined by the outer tube 210 , the inner tube 220 , the upper cover 230 , and the lower cover 240 (the height direction of the outer tube 210 or the inner tube 220 ) The filter media 100 may fill the In this case, the air flowing into the cylindrical chemical filter 10 may pass through the filter media 100 without a gap.

FIG. 2 is a schematic cross-sectional view showing a section A of the filter media shown in FIG. 1 .

The filter media 100 may include a media body 110 . A foam melt 190 may be formed on the surface of the media body 110 .

The media body 110 may remove chemical contaminants contained in the air while passing the air. The chemical contaminants may be removed, for example, by adsorption.

3 is a schematic cross-sectional view of a media body according to exemplary embodiments;

In exemplary embodiments, the media body 110 may include a lower nonwoven fabric 115 , an adsorption layer 116 , and an upper nonwoven fabric 117 .

The lower nonwoven fabric 115 and the upper nonwoven fabric 117 may pass air and support the adsorption layer 116 . In some embodiments, the lower nonwoven fabric 115 and the upper nonwoven fabric 117 may adsorb chemical contaminants depending on the material.

The adsorption layer 116 may have an adsorption material fixed by hot melt. The adsorption material may include activated carbon or an adsorption resin.

In example embodiments, a plurality of adsorption layers 116 may be interposed between the lower nonwoven fabric 115 and the upper nonwoven fabric 117 . In this case, filtering performance for chemical contaminants may be improved.

The filter media 100 may include an outer bend 120 and an inner bend 140 . The outer bent part 120 may be formed by bending the media body 110 inwardly at both sides of the specific point around a specific point. The inner bent portion 140 may be formed by bending the media body 110 to the outside at both sides of the specific point around the specific point.

The filter media 100 may be formed by alternately repeating the outer bent portion 120 and the inner bent portion 140 to form a tube. When the outer bent portion 120 and the inner bent portion 140 are alternately repeated, the cross-section of the filter media 100 may have a zigzag shape, for example.

In example embodiments, a space between adjacent outer bent portions 120 may be defined as an outer wrinkle space. In addition, a space between the adjacent inner bent portions 140 may be defined as an inner wrinkle space.

The foam melt 190 may be formed on at least one surface of the media body 110 . The foam melt 190 may be formed substantially parallel to the wrinkle direction of the media body 110 (the direction in which the bent portion is bent when forming the bent portion). In exemplary embodiments, the foam melt 190 may include an outer foam melt 192 formed on the outer surface 112 of the media body 110 and an inner foam melt 194 formed on the inner surface 114 of the media body 110 . can

In exemplary embodiments, the outer foam melt 192 and the inner foam melt 194 may be formed along the entire perimeter of the filter media 100 . In this case, the outer foam melt 192 may be formed on the outer surface of the outer bent portion 120, it may be formed in the outer corrugation space (130). The inner foam melt 194 may be formed on the inner surface of the inner bent portion 140 , and may also be formed in the inner wrinkle space 150 .

Parts positioned on both sidewalls of the outer corrugation space 130 of the outer foam melt 192 may be cured by contacting each other. In addition, portions positioned on both sidewalls of the inner corrugation space 150 of the inner foam melt 194 may be cured by contacting each other. Accordingly, the distance between the outer pleated space 130 and the inner pleated space 150 may be fixed.

Foam melt 190 may be foamed and cured after being applied to the media body 110 to fix the space between the outer wrinkle space and the outer bent portions 120 and the space between the inner wrinkle space. Accordingly, the space between the adjacent outer bent parts 120 and the space between the adjacent inner bent parts 140 may be fixed. In this case, the pleat shape (eg, the zigzag shape) of the filter media 100 may be fixed to maintain a large surface area of the filter media 100 .

4 is a schematic cross-sectional view illustrating a portion of filter media according to exemplary embodiments.

Referring to FIG. 4 , the foam melt 190 may be formed in a portion of the media body 110 except for the outer bent portion 120 and the inner bent portion 140 . In this case, the foam melt 190 can be formed only in portions (wrinkle spaces) that substantially fix the gap, and the manufacturing cost and weight of the filter media 100 can be reduced.

5 is a schematic cross-sectional view illustrating a portion of filter media in accordance with exemplary embodiments.

Referring to FIG. 5 , the outer foam melt 192 may not be formed in a portion of the outer surface 112 of the media body 110 where the inner bent portion 140 is located. The inner foam melt 194 may not be formed in a portion of the inner surface 114 of the media body 110 where the outer bent portion 120 is located. In this case, the amount of the foam melt 190 can be reduced.

In exemplary embodiments, the foam melt may be manufactured by foaming a polyolyepine-based resin. The polyolefin-based resin may be prepared from a polyolefin polymer, and the polyolefin polymer is, for example, polypropylene, polyisobutylene, polybutene, butyl rubber (polyisobutylene-isoprene) styrene block copolymer. SBS (styrene-butadiene-styrene), SIS (styrene-isoprene-styrene), SEBS (styrene-ethylene-butylene-styrene), SEPS (styrene-ethylene-propylene-styrene), SIBS (styrene-isoprene-butadiene-styrene) ), SPIBS (styrene-polyisobutylene-styrene) may also be at least one selected from the group consisting of a modified form, an amorphous form, and an amorphous copolymer of a-olefin (APAO).

In addition, the polyolefin-based resin may further include, in some cases, a tackifying resin, a plasticizer including polyisobutylene, a phenol-based antioxidant, and a UV stabilizer. The adhesion-imparting resin is for increasing adhesion, and may contain 20 to 40 wt% of an aliphatic petroleum resin, a resin ester, and a terpene resin based on the total weight of the polyolefin-based resin. The plasticizer containing polyisobutylene is for imparting flexibility and delaying dryness of the adhesive during use, maleic anhydride-polypropylene is for improving adhesion, and phenolic antioxidant is for improving thermal stability it may be for

In some embodiments, the polyolefin resin may include 5 to 25% by weight of a styrene block copolymer, 40 to 50% by weight of amorphous polypropylene, and 40 to 50% by weight of a hydrocarbon resin, 180° C. It may have a viscosity of 1,000 to 10,000 cPs. If the viscosity exceeds the above range, the foaming rate may be increased, but there is a risk of foaming off due to a prolonged cooling time.

The polyolefin resin can be foamed in various ways. For example, mechanical foaming or extrusion molding of a resin composition including a physical foaming agent or a chemical foaming agent using a foaming gas or foaming agent. In the case of foaming using a gas, a molten polyolefin-based resin is mixed with a suitable gas under sufficient pressure to form a foamable mixture or solution with a solution or dispersion of the gas in the molten polyolefin-based resin. When the pressure is sufficiently reduced, such as caused by dispensing the mixture at atmospheric pressure, the gas can develop and expand in the form of droplets in the molten polyolefin-based resin to form a closed cell structure within the matrix. The gas may be, for example, nitrogen, carbon dioxide, an inert gas such as argon and helium, and mixtures thereof, but is not limited thereto, and may preferably be nitrogen.

The foaming rate of the foam melt 190 prepared by foaming the polyolefin-based resin may be 20 to 200%. The foaming rate is a volume change rate before and after foaming of the polyolefin-based resin, and when the foaming rate is less than 20%, the intended level The buffering effect cannot be sufficiently obtained, and when the foaming rate exceeds 200%, the foaming does not occur uniformly, so there is a risk that air bubbles may be turned off or generated during discharge. Preferably, the foaming rate may be 70 to 130%. Therefore, since foam felt prepared by foaming a polyolefin-based resin having a large volume-to-volume increase ratio is used as a space maintaining member, it has excellent cushioning effect against external impact compared to conventional separators and chemical filters using hot melt, so it has excellent durability as well as excellent durability. , since the air flow passage passing through the filter can be improved, the pressure loss can be reduced and excellent differential pressure performance can be exhibited.

In exemplary embodiments, the average spacing w1 of the outer pleated space 130 may be 3 to 30 mm, and the average spacing w2 of the inner pleated space 150 may be 1 to 15 mm. When the average distance between the outer corrugated space 130 and the inner corrugated space 150 is less than the above range, the gap between the air passages is narrow and the pressure loss may increase. When the average distance between the outer pleat space 130 and the inner pleat space 150 exceeds the above range, the area through which air passes through the filter media 100 is reduced, and the filter media 100 can be easily deformed. .

In exemplary embodiments, the foam melt 190 may be formed in a plurality of lines spaced at equal intervals along the wrinkle direction on one surface and the other surface of the media body 110 . The distance between the lines may be 10 to 300 mm. If the distance is less than 10 mm or exceeds 300 mm, the manufacturing process may be inefficient and the durability of the filter may be weakened. Preferably, the distance may be 50 to 250 mm.

In exemplary embodiments, the thickness of the foam melt 190 may be 2 to 20 mm. If the thickness of the foam melt 190 is less than 2 mm, the amount of air passing through may decrease and thus the differential pressure performance may be lowered. weaken and the media body 110 may deform.

6 is a schematic flowchart illustrating a method of manufacturing a cylindrical chemical filter according to exemplary embodiments.

Referring to FIG. 6 , the media body may be bent (eg, step S10 ).

The media body may be, for example, the media body 110 described with reference to FIG. 3 .

The media body 110 applies hot melt on the lower nonwoven fabric 115, forms an adsorption layer 116 by applying an adsorption material on the hot melt, and then re-coats the hot melt on the adsorption layer, and the upper nonwoven fabric ( 117) may be formed by bonding. If the process of re-applying the adsorption material and the hot melt before bonding the upper nonwoven fabric 117 is repeated, the adsorption layer 116 may be formed in a plurality of layers.

7 is a schematic plan view illustrating a method of forming filter media in accordance with exemplary embodiments.

Referring to FIG. 7 , the media body 110 may be bent at regular intervals along the longitudinal direction (arrow direction). For example, the media body 110 may be bent around a line (vertical dotted line) perpendicular to the longitudinal direction. The vertical dotted line may alternately include an outer pre-bend line 122 and an inner pre-bend line 142 .

When the outer preliminary bending line 122 is bent so as to protrude upward (upward) based on the plane of the media body 110, the outer preliminary bending portion 124 is formed, and the inner preliminary bending line 142 is lowered. When bending to enter (downward), the inner preliminary bent portion 144 may be formed. By alternately and repeatedly forming the outer pre-bent portion 124 and the inner pre-bend portion 144 , a wrinkle may be formed in the media body 110 .

In example embodiments, the average distance between the adjacent outer preliminary bent parts 124 and the average distance between the adjacent inner preliminary bent parts 144 may be 2 to 20 mm. In this case, when the media body 110 is re-bent to form the filter media 100 , the average spacing of the outer pleated spaces 130 is 3 to 30 mm, and the average spacing of the inner pleated spaces 150 is 1 to 15 mm. can be

The corrugated media body 110 and the preliminary bent portions 122 and 142 are developed (eg, step S20).

A foam melt is applied to both sides of the deployed media body 110 in the longitudinal direction (eg, step S30). For example, the foam melt (horizontal solid line) applied to the upper surface of the media body 110 is provided as the outer foam melt 192, and the foam melt (horizontal dotted line) applied to the bottom surface is provided as the inner foam melt 194. can be The application may be performed globally or intermittently.

In exemplary embodiments, the foam melt may be melted at a temperature of 120 to 220°C. When the melting temperature is less than 120° C., the foam melt may be insufficiently melted. When the melting temperature is higher than 220° C., the nucleating agent action is weakened and the foamed foam can be easily extinguished. Preferably, when the melting temperature is 160 to 200 ℃, cracks of the foamed foam melt can be prevented.

Referring to FIG. 7 , the foam melts 192 and 194 may be applied to the entire length of the media body 110 . In this case, the filter media 100 having the structure of FIG. 2 may be manufactured.

8 and 9 are schematic plan views illustrating a method of forming filter media according to exemplary embodiments.

Referring to FIG. 8 , the foam melts 192 and 194 may be applied to both sides of the media body 110 while avoiding the outer pre-bend 124 and the inner pre-bend 144 . In this case, the filter media 102 having the structure of FIG. 4 can be manufactured.

Referring to FIG. 9 , an outer foam melt 192 is applied to the outer preliminary bent portion 124 on the upper surface of the media body 110 , and the inner foam is applied to the inner preliminary bent portion 144 on the lower surface of the media body 110 . Melt 194 may be applied. In this case, the filter media 104 having the structure of FIG. 5 can be manufactured.

In exemplary embodiments, after application of the foam melts 192 and 194, the media body 110 may be left at 10 to 25° C. for 5 seconds to 5 minutes. When the leaving temperature is greater than the above range or the leaving time is less than the above range, the degree of curing may be insufficient or the adhesive force may be reduced during curing of the foam melts 192 and 194 . In addition, it may be difficult to bend the media body 110 again and maintain the bent shape until it is cured. When the standing temperature is less than the above range, or the leaving time is more than the above time, re-bending may be difficult due to overcuring.

The media body 110 coated with the foam melts 192 and 194 is again bent along the preliminary bending portions 124 and 144 . Then, both ends of the bent media body 110 in the longitudinal direction are joined to each other to form a hollow cylinder shape (eg, step S40).

Thereafter, by curing the foam melts 192 and 194 to fix the media body 110 in a hollow cylinder shape, the filter media 100 is formed (eg, step S50 ). For example, the foam melt 190 may expand upon curing.

In exemplary embodiments, a polyolefin-based resin having a foaming rate of 20 to 200% may be used as the foam melts 192 and 194, and the foam melts 192 and 194 are expanded and expanded by the above-described method. In this case, each of the foam melts 192 and 194 applied to the sidewalls of the outer corrugated space 130 and the inner corrugated space 150 may contact each other by volume expansion. By curing each of the foam melts 192 and 194 in contact with each other, it is possible to fix the gap between the outer pleat space 130 and the inner pleat space 150 .

In exemplary embodiments, curing of the foam melts 192 and 194 may be performed at 20 to 30° C. for 5 seconds to 5 minutes. When the curing temperature exceeds the above range or the curing time is below the above range, curing may occur insufficiently. When the curing temperature is less than the above range, or the curing time is above the above range, cracks may occur due to overcuring or adhesion may be reduced.

In addition, the filter media 100 may be disposed in a filter frame including an outer tube 210 , an inner tube 220 , an upper cover 230 and a lower cover 240 to manufacture a cylindrical chemical filter 10 . .

Hereinafter, an embodiment of the present invention will be described in detail. However, the following examples are merely illustrative of the present invention, and the content of the present invention is not limited to the following examples.

Examples, Comparative Examples 1 and 2

Referring to Dongrok Patent Publication No. 1179475 of the present inventors, after spraying and applying a hot melt binder melted at 190° C. to the nonwoven fabric, spraying and attaching activated carbon of 2040 mesh size is repeated 4 times, and finally, the upper part of the adsorbent A roll type of media for chemical filters was prepared by applying hot melt to the surface. Then, after preparing a polyolefin-based resin comprising 10% by weight of a styrene block copolymer, 50% by weight of amorphous polypropylene, and 40% by weight of a hydrocarbon resin, and exhibiting a viscosity of 4000 cps at 180° C., using nitrogen gas Foam-melt was prepared by foaming so that the foaming rate was 100%.

After first bending and unfolding the media for the chemical filter in a zigzag shape, the foam-melt was continuously and continuously adhered to one side and the other side of the media at equal intervals of 100 mm. At the same time as the foam melt adhesion, the first cooling was performed at 20° C. for 10 seconds. At least a portion of the foam melt adhered to the first cooled media is in contact with each other to maintain a distance between the plurality of bent parts while second bending in a zigzag shape and bonding both ends of the media in the bending direction to each other to have a thickness of about 65T It was manufactured in the shape of a hollow cylinder.

A cylindrical chemical filter was manufactured by assembling the second bent media in a frame cooled a second time at 25° C. for 10 seconds. At this time, the application temperature, foaming rate, diameter, etc. of the foam melt were adjusted as shown in Table 1 below.

It is shown in Table 1 below by judging whether cracks occurred in the foam melt with the naked eye.

Foam melt temperature (℃) Foaming rate (%) Outer bend gap (mm) Inner bend gap (mm) Cracks Example 1 170 100 5 3 X Example 2 160 100 7 5 X Example 3 160 100 8 6 X Example 4 160 100 9 7 X Example 5 160 100 9 7 X Example 6 160 100 7 5 X Example 7 160 100 5 3 X Example 8 160 70 7 5 X Comparative Example 1 145 100 8 6 O Comparative Example 2 160 130 9 7 O

Comparative Example 3

In the media for a chemical filter having a hollow cylinder shape of Example 5, a chemical filter was manufactured by adhering and inserting hot melt in order to maintain an interval between the plurality of bent portions. The hot melt contains 10% by weight of a styrene block copolymer, 50% by weight of amorphous polypropylene, and 40% by weight of a hydrocarbon resin, and exhibits a viscosity of 4000 cps at 180°C.

Experimental Example 1

The differential pressure according to the interval between the bent portions of the chemical filter to which the foam melt of Examples 5 to 7 is adhered was measured under the following conditions and shown in FIG. 10 .

- Experimental equipment; In-house FFU test equipment

- Temperature and Humidity: 23±2℃ ' 45±5%RH

- Tachometer: 9565-P (TSI, USA)

- Differential pressure gauge: CP300 (KIMO. Japan)

According to FIG. 10, in the experimental section (FFU surface wind speed of 0.5 m/s or less), the pressure loss was reduced in Example 5 with a large gap between the bends compared to Example 7 with a relatively small gap between the bends. Accordingly, it can be seen that as the distance between the bent portions is increased, the pressure loss is reduced and the differential pressure performance is improved.

Experimental Example 2

The chemical filter of the foam melt method of Example 5 and the chemical filter of the hot melt method of Comparative Example 3 were measured by measuring the differential pressure at a surface wind speed of 0.4 m/s in the same manner as in Experiment 1, respectively, and are shown in FIG. 11 .

According to FIG. 11, the chemical filter of the foam-melt method of Example 5 according to the present invention has an improved air flow path through the filter under the same surface wind speed condition as compared to the chemical filter of the hot-melt method of Comparative Example 3, the pressure Loss decreased. Accordingly, it can be seen that the differential pressure performance is improved.

10: cylindrical chemical filter
100: filter media 110: media body
120: outer bend 130: outer wrinkle space
140: inner bent portion 150: inner wrinkle space
190: pommel
210: outer tube 220: inner tube
230: upper cover 240: lower cover

Claims (18)

a filter media having a hollow cylinder shape and including outer and inner bends that are bent in a zigzag and are alternately repeated;
a foam melt formed along an outer perimeter and an inner perimeter of the filter media;
an outer tube surrounding the outside of the filter media and having a plurality of vents formed on the wall surface;
an inner tube disposed inside the filter media and having a plurality of vents formed on the wall surface; and
Comprising an upper cover and a lower cover respectively closing the upper and lower portions of the space formed between the outer tube and the inner tube,
The foam melt is not formed on the outer and inner surfaces of the outer bent portion, and the outer and inner surfaces of the inner bent portion, a cylindrical chemical filter. The method according to claim 1, wherein a space between the adjacent outer folds is defined as an outer pleat space, and a space between the adjacent inner folds is defined as an inner pleat space,
The foam melt is inserted into the outer pleat space and the inner pleat space, a cylindrical chemical filter. The cylindrical chemical filter according to claim 2, wherein the foam melts formed on both sidewalls of the outer pleat space contact each other, and the foam melts formed on both sidewalls of the inner pleat space contact each other. delete The cylindrical chemical filter according to claim 2, wherein the average spacing of the outer pleated spaces is 3 to 30 mm, and the average spacing of the inner pleated spaces is 1 to 15 mm. The cylindrical chemical filter of claim 1, wherein the foam melt comprises a polyolefin-based resin. The method according to claim 1, wherein the foam melt has a foaming rate of 20 to 200%. Cylindrical chemical filter. The cylindrical chemical filter according to claim 1, wherein the foam melt is formed in a plurality of lines parallel to each other on the filter media, and an interval between the lines is 10 to 300 mm. The cylindrical chemical filter of claim 1, wherein the filter media has an adsorption layer comprising an adsorption material adhered by hot melt between the upper nonwoven substrate and the lower nonwoven fabric. The cylindrical chemical filter according to claim 9, wherein the adsorption material comprises activated carbon or an adsorbent resin. The cylindrical chemical filter according to claim 1, wherein the foam melt fixes a gap between the adjacent outer bent parts and a gap between the adjacent inner bent parts. forming a preliminary bending portion including an outer preliminary bending portion and an inner preliminary bending portion by alternately bending the media body upward and downward;
developing the preliminary bent part;
applying the foam melt to both sides of the developed media body along the longitudinal direction;
forming a filter media by bonding both ends in the longitudinal direction while bending the media body coated with the foam melt along the preliminary bending portion again;
curing the foam melt to fix the shape of the filter media; and
placing the filter media in a filter frame;
In the step of applying the foam melt, the foam melt is not applied to both surfaces of the developed pre-bent portion, the manufacturing method of a cylindrical chemical filter. The method of claim 12, wherein the foam melt comprises a polyolefin-based resin having a foaming rate of 20 to 200%. delete delete The method for manufacturing a cylindrical chemical filter according to claim 12, wherein the forming of the preliminary bent portion comprises forming the outer preliminary bent portion and the inner preliminary bent portion with an average interval of 2 to 20 mm. The method for manufacturing a cylindrical chemical filter according to claim 12, wherein the applying the foam melt comprises leaving the applied foam melt at 10 to 25° C. for 5 seconds to 5 minutes. The method for manufacturing a cylindrical chemical filter according to claim 12, wherein the filter media is formed by laminating an adsorption layer comprising an adsorption material adhered by hot melt between an upper nonwoven substrate and a lower nonwoven substrate.

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