B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 3/24 (2006.01) A61F 13/15 (2006.01) D04H 13/00 (2006.01) A61F 13/46 (1990.01)
Patent
CA 2138253
The composite material of the invention is constituted by a thermoplastic film (2) having a multiplicity of perforation craters (4) of small dimensions on one of its faces and whose smooth, other face is covered in fibers (3) most of which are thermoplastic and that are bonded to one another and to the film (3) in substantially continuous manner. The material is usable as a breathing film for absorbent hygiene articles, in particular diapers. A method of manufacture consists: a) in dispersing a sheet of fibers (3) most of which are thermoplastic onto a thermoplastic film (2), or in extruding a thermoplastic film onto a non-woven fabric made of such fibers; b) in presenting the fiber/film composite onto a surface that is provided with orifices; and c) in heating to a temperature close to the softening temperature of the two thermoplastic materials while simultaneously establishing suction through the orifices so as to cause the film overlying said orifices to puncture. The method may include a prior step of pre-coating with adhesive, which step may be implemented, in particular, by the melt-blown technique at a rate of 0.2 g/m2 to 5 g/m2 of adhesive.
Guial S.a.
Sim & Mcburney
LandOfFree
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