IP Library › Granted Patent US 7,456,120
Granted Patent B2
US 7,456,120 · App. 11/520,370 · Granted Nov 25, 2008

Bag filter comprising meta-aramid and acrylic fiber

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Quick Facts
Patent No.
US 7,456,120
App. No.
11/520,370
Granted
Nov 25, 2008
Kind
B2
Abstract

This invention relates to a bag filter having a tubular section, one closed end and one open end, the tubular section having a nonwoven felt comprising an intimate fiber blend of 50 to 80 parts by weight meta-aramid fiber and 20 to 50 parts by weight acrylic fiber, based on the total weight of meta-aramid and acrylic fibers in the felt, wherein the acrylic fiber has an equal or lower denier per filament than the meta-aramid fiber.

Claims (20)

1. A bag filter having a tubular section, one closed end and one open end, the tubular section having a nonwoven felt comprising an intimate fiber blend of

a) 50 to 80 parts by weight meta-aramid fiber, and

b) 20 to 50 part by weight acrylic fiber, based on the total weight of meta-aramid and acrylic fibers in the felt,

wherein the acrylic fiber has an equal or lower denier per filament than the meta-aramid fiber; and,

wherein the bag filter is capable of filtering a hot gas at a temperature of at least 150 degrees centigrade.

2. The bag filter of claim 1 comprising 65 to 75 parts by weight meta-aramid fiber.

3. The bag filter of claim 1 comprising 25 to 35 parts by weight acrylic fiber.

4. The bag filter of claim 1 wherein the nonwoven felt is a needlepunched felt.

5. The bag filter of claim 1 wherein the nonwoven felt is a spunlaced felt.

6. The bag filter of claim 1 wherein the denier per filament of the meta-aramid fiber is from 1 to 5.

7. The bag filter of claim 1 wherein the denier per filament of the acrylic fiber is 0.5 to 3.

8. The bag filter of claim 1 wherein the closed end also comprises the intimate fiber blend.

9. The bag filter of claim 1 wherein the basis weight of the felt is from 8 to 16 ounces per square yard.

10. The bag filter of claim 9 wherein the basis weight of the felt is from 12 to 14 ounces per square yard.

11. A process of filtering a hot gas comprising passing a gas heated to a temperature of at least 150 degrees C. through a bag filter

having a tubular section, one closed end and one open end, the tubular section having a nonwoven felt comprising an intimate fiber blend of

a) 50 to 80 parts by weight meta-aramid fiber, and

b) 20 to 50 part by weight acrylic fiber, based on the total weight of meta-aramid and acrylic fibers in the felt,

wherein the acrylic fiber has an equal or lower denier per filament than the meta-aramid fiber, and

wherein the bag filter is capable of filtering a hot gas at a temperature of at least 150 degrees centigrade.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 25, 2019
From: E. I. DU PONT DE NEMOURS AND COMPANY
To: DUPONT SAFETY & CONSTRUCTION, INC.
Reel/Frame 051180/0648 →