Formable nonwoven sheet

Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness

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Details

28116, 156 622, 156 624, 428198, 428224, 428288, 428409, B32B 514

Patent

active

047013656

ABSTRACT:
Disclosed is a formable nonwoven sheet of filaments of a polyester group and having superior forming properties, i.e., a forming processability and a shape retaining property and utilizability, i.e., physical properties and properties during use, produced by controlling a state of bonding between each single filament in the nonwoven sheet, which state of bonding is expressed by a relationship between a needle piercing resistance value and a hooking resistance value in a predetermined range.
A formable nonwoven sheet having a smooth surface can be obtained by heat treating an intermediate nonwoven sheet while controlling an area shrinkage of the intermediate nonwoven sheet caused by the heat, by holding the intermediate nonwoven sheet from both sides while a formable nonwoven sheet having a high flexural endurance can be obtained by heat treating the intermediate nonwoven sheet while allowing the intermediate nonwoven sheet to be shrunk by heat from steam or boiling water.

REFERENCES:
patent: 3523149 (1970-08-01), Hartmann
patent: 3847729 (1974-11-01), Hartmann
patent: 4578307 (1986-03-01), Niki et al.

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