Hot press cushioning material
AssigneeYamauchi Corporation
InventorsTakamitsu Ozeki, Akira Yoshida
Life of this patent
Estimating the term…
Abstract
A hot press cushioning material includes: a first nonwoven fabric forming an inner layer; and second nonwoven fabrics placed on both surfaces of the first nonwoven fabric and forming outer layers. Copolymerized para-aramid fibers having a basis weight of 80 to 400 g/m2 are used as a material of the second nonwoven fabrics. Fibers that are more rigid than the copolymerized para-aramid fibers are used as a material of the first nonwoven fabric. Each of the first nonwoven fabric and the second nonwoven fabrics has a heat resistant temperature of 270° C. or more.
Claims1
A hot press cushioning material for a hot press, comprising:
- a first nonwoven fabric forming an inner layer;
- and
- second nonwoven fabrics needle punched to both surfaces of said first nonwoven fabric and forming surface layers, wherein:
- each second nonwoven fabric having an inner surface facing the first nonwoven fabric and an outer surface, and the outer surfaces of the second nonwoven fabrics are substantially planar,
- said first nonwoven fabric including poly-(p-phenylene terephthalamide) fiber as a material of said first nonwoven fabric,
- said second nonwoven fabrics including co-poly-(paraphenylene/3,4′-oxydiphenylene terephthalamide) fiber as a material of said second nonwoven fabrics, having a basis weight of 80 to 400 g/m2,
- said first nonwoven fabric and said second nonwoven fabric have a heat resistant temperature of 270° C. or more,
- a rigidity of the first nonwoven fabric is greater than a rigidity of said second nonwoven fabric, and
- a basis weight of the first nonwoven fabric is larger than the basis weight of the second nonwoven fabrics.
Dependencies are inferred from the claim text.