IP Library › Granted Patent US 12,385,171
Granted Patent B2
US 12,385,171 · App. 18/391,826 · Granted Aug 12, 2025

Flame resistant fabrics

Inventors: Robert Self (Peachtree City, GA); Keith Edward Pickering (Decatur, GA)
Assignee: Southern Mills, Inc.
D03D15/513D03D1/0035D03D13/008D03D15/225D03D15/283D03D15/47D10B2201/24D10B2321/08D10B2331/021D10B2401/063D10B2403/0114D10B2501/00
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Quick Facts
Patent No.
US 12,385,171
App. No.
18/391,826
Granted
Aug 12, 2025
Kind
B2
Abstract

Flame resistant fabrics formed with fiber blends that provide the requisite flame and thermal protection but that have improved durability. In some embodiments this is accomplished with the use of fiber blends that include relatively large percentages of FR nylon fibers in combination with cellulosic and inherently flame resistant fibers.

Claims (29)

1. A flame resistant fabric comprising a fabric fiber blend and formed of a plurality of yarns, wherein:

i. each of the plurality of yarns is formed from a yarn fiber blend that comprises aramid fibers, modacrylic fibers, cellulosic fibers, and FR nylon fibers;

ii. the fabric fiber blend comprises 5-20 wt. % aramid fibers, 15-40 wt. % modacrylic fibers, 15-40 wt. % cellulosic fibers, and 30-50 wt. % FR nylon fibers, inclusive; and

iii. the fabric has a char length of 6 inches or less and an afterflame of 2 seconds or less when tested pursuant to ASTM D6413 (2015).

2. The flame resistant fabric of claim 1 , wherein the yarn fiber blend is identical for all of the plurality of yarns, and wherein the yarn fiber blend is identical to the fabric fiber blend.

3. The flame resistant fabric of claim 1 , wherein the fabric fiber blend comprises 5-15 wt. % aramid fibers, 15-30 wt. % modacrylic fibers, 15-30 wt. % cellulosic fibers, and 35-45 wt. % FR nylon fibers, inclusive.

4. The flame resistant fabric of claim 1 , wherein the wt. % of FR nylon fibers in the fabric fiber blend is greater than the wt. % of each of the aramid, modacrylic, and cellulosic fibers in the fabric fiber blend.

5. The flame resistant fabric of claim 1 , wherein the wt. % of FR nylon fibers in the fabric fiber blend is greater than a combined wt. % of the modacrylic fibers and the aramid fibers in the fabric fiber blend.

6. The flame resistant fabric of claim 1 , wherein the fabric fiber blend consists of 5-20 wt. % aramid fibers, 15-40 wt. % modacrylic fibers, 15-40 wt. % cellulosic fibers, and 30-50 wt. % FR nylon fibers, inclusive.

7. The flame resistant fabric of claim 1 , wherein the plurality of yarns comprises a first set of yarns having a first yarn fiber blend and a second set of yarns having a second yarn fiber blend different than the first yarn fiber blend.

8. The flame resistant fabric of claim 7 , wherein the first yarn fiber blend comprises approximately 5-15 wt. % aramid fibers, 5-15 wt. % modacrylic fibers, 35-45 wt. % cellulosic fibers, and 35-45 wt. % FR nylon fibers, inclusive.

9. The flame resistant fabric of claim 8 , wherein the second yarn fiber blend comprises approximately 5-15 wt. % aramid fibers, 35-45 wt. % modacrylic fibers, 5-15 wt. % cellulosic fibers, and 35-45 wt. % FR nylon fibers, inclusive.

10. The flame resistant fabric of claim 7 , wherein the fabric is a woven fabric comprising a warp direction and a fill direction, wherein the first set of yarns is provided only in one of the warp direction or the fill direction and the second set of yarns is provided only in the other of the warp direction or the fill direction.

11. The flame resistant fabric of claim 7 , wherein the fabric is a woven fabric comprising a warp direction and a fill direction, wherein the first and second sets of yarn are both provided in at least one of the warp direction or the fill direction.

12. The flame resistant fabric of claim 1 , wherein at least some of the cellulosic fibers in the fabric fiber blend are non-FR lyocell fibers.

13. The flame resistant fabric of claim 1 , wherein at least some of the aramid fibers in the fabric fiber blend are para-aramid fibers.

14. The flame resistant fabric of claim 1 , wherein the fabric has a weight of 3-12 ounces per square yard, inclusive.

15. A flame resistant fabric comprising a fabric fiber blend and formed of a plurality of yarns, wherein:

i. each of the plurality of yarns is formed from a yarn fiber blend that comprises aramid fibers, modacrylic fibers, cellulosic fibers, and FR nylon fibers;

ii. the fabric fiber blend comprises 5-20 wt. % aramid fibers, 15-40 wt. % modacrylic fibers, 15-40 wt. % cellulosic fibers, and 30-50 wt. % FR nylon fibers, inclusive;

iii. the wt. % of FR nylon fibers in the fabric fiber blend is greater than the wt. % of each of the aramid, modacrylic, and cellulosic fibers in the fabric fiber blend;

iv. the fabric has a char length of 6 inches or less and an afterflame of 2 seconds or less when tested pursuant to ASTM D6413 (2015);

V. the fabric has a break strength of at least 150 pounds force in a warp direction of the fabric and of at least 100 pounds force in a fill direction of the fabric;

vi. the fabric has a tear strength of at least 8 pounds force in at least one of the warp direction or fill direction of the fabric; and

vii. the fabric achieves a predicted burn injury percentage of 30% or less after 4 seconds, when tested pursuant to ASTM F1930 (2018).

16. The flame resistant fabric of claim 15 , wherein the yarn fiber blend is identical for all of the plurality of yarns, and wherein the yarn fiber blend is identical to the fabric fiber blend.

17. The flame resistant fabric of claim 15 , wherein the fabric fiber blend comprises 5-15 wt. % aramid fibers, 15-30 wt. % modacrylic fibers, 15-30 wt. % cellulosic fibers, and 35-45 wt. % FR nylon fibers, inclusive.

18. The flame resistant fabric of claim 15 , wherein the wt. % of FR nylon fibers in the fabric fiber blend is greater than a combined wt. % of the modacrylic fibers and the aramid fibers in the fabric fiber blend.

19. The flame resistant fabric of claim 15 , wherein the fabric fiber blend consists of 5-20 wt. % aramid fibers, 15-40 wt. % modacrylic fibers, 15-40 wt. % cellulosic fibers, and 30-50 wt. % FR nylon fibers, inclusive.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 21, 2023
From: SELF, ROBERT; PICKERING, KEITH EDWARD
To: SOUTHERN MILLS, INC.
Reel/Frame 065931/0185 →
Continuity (3)
Continuation 17884866 · Aug 10, 2022
Provisional Application 63231528 · Aug 10, 2021
Related Publication 20240125015A1 · Apr 18, 2024
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