Patent ID: 11872798
Assignee: FIBERTEX NONWOVENS A/S
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B  D | IPC B  D

Claim 0:
1. A method for manufacturing a nonwoven fabric having an air permeability of between 100 and 1500 l/m2/s when measured at a pressure difference of 200 Pa according to EN ISO 9237, the method comprising the steps of:
providing at least two sets of fibers, wherein a first fiber set comprises at least 30 wt-% of splittable fibers and a second fiber set comprises less than 20 wt-% of splittable fibers or no splittable fibers;
using the first fiber set to form at least one first fibrous web in a first web formation process and using the second fiber set to form at least one second fibrous web in a second web formation process;
stacking the first and second webs so obtained to provide a multilayer web including two distinct layers of fibrous webs;
bonding together the multilayer web comprising the first and second webs, wherein the bonding comprises spunlacing to direct high pressure fluid jets to the multilayer web to at least partially split splittable fibers from the first web into small filaments and intertangle fibers from the first and second webs; and
impregnating the bonded multilayer web, the impregnating comprising adding a binder to stiffen and fixate the nonwoven fabric and a flame retardant.