公开(公告)号：WO2023278929A1

公开(公告)日：2023-01-05

申请号：PCT/US2022/072810

申请日：2022-06-08

Applicant: DUPONT SAFETY & CONSTRUCTION, INC.

Inventor： ROCHETTE, France ,  SAHBAEE, Arash

IPC: D04H1/4274 ,  D04H1/4342 ,  D04H1/435 ,  B29C63/0017 ,  B29C63/28 ,  B29K2105/12 ,  B29K2105/26 ,  B29K2265/00 ,  B29L2023/22 ,  F16L55/1656

Abstract: A pipe liner comprising a nonwoven felt, and process for making said nonwoven felt, the nonwoven felt consisting essentially of 0 to 85 weight percent polyester staple fibers and 15 to 100 weight percent para-aramid staple fibers, the nonwoven felt having a basis weight of 250 to 600 grams per square meter and a thickness of 2.0 to 5.0 mm; wherein: 20 to 100 weight percent of the total amount of para-aramid staple fibers are re-purposed para-aramid staple fibers, 0 to 80 weight percent of the total amount of para-aramid staple fibers are crimped virgin para-aramid staple fibers having a uniform cut length, and at least 50 weight percent of the total amount of the combined polyester and para-aramid staple fibers are crimped staple fibers.