BACKING BASE MATERIAL FOR FLOOR MATERIAL AND ITS MANUFACTURE

摘要

PROBLEM TO BE SOLVED: To provide a backing base material for a floor material of a 3-layer structure obtained by coating a front surface of 2-layer laminated glass fiber nonwoven fabric with coating liquid containing pigment and binder having satisfactory coating properties at the time of laminating the floor material without release at the time of practical use, sufficient durability at the time of practical use and dimensional stability of obtaining satisfactorily flat polyvinyl chloride coating processing surface in the backing base material to become the floor material formed by coating with polyvinyl chloride. SOLUTION: In the backing base material for a floor material of a 3-layer structure obtained by coating a surface of a second layer of 2-layer laminated glass fiber nonwoven fabric obtained by using oblique wire type papermaking machine and a Yankee dryer with coating liquid containing pigment and binder, the second layer contains glass fiber, pulp fiber and binder fiber, a central surface mean roughness SRa by a stylus type three-dimensional surface roughness meter is 5 to 12μm on a surface of an uppermost layer, 13 to 28μm on a surface of a lowermost layer and a lateral shrinkage factor of 0.2% or less.