Hot press cushioning material

Abstract

A hot press cushioning material ( 14 a ) includes: a first nonwoven fabric ( 15 ) forming an inner layer; and second nonwoven fabrics ( 16 a , 16 b ) placed on both surfaces of the first nonwoven fabric ( 15 ) and forming outer layers. Copolymerized para-aramid fibers having a basis weight of 80 to 400 g/m 2 are used as a material of the second nonwoven fabrics ( 16 a , 16 b ). Fibers that are more rigid than the copolymerized para-aramid fibers are used as a material of the first nonwoven fabric ( 15 ). Each of the first nonwoven fabric ( 15 ) and the second nonwoven fabrics ( 16 a , 16 b ) has a heat resistant temperature of 270° C. or more.

1 . A hot press cushioning material for use in hot press, comprising:
 a first nonwoven fabric forming an inner layer; and second nonwoven fabrics placed on both surfaces of said first nonwoven fabric and forming outer layers, wherein   copolymerized para-aramid fibers having a basis weight of 80 to 400 g/m 2  are used as a material of said second nonwoven fabrics, and fibers that are more rigid than said copolymerized para-aramid fibers are used as a material of said first nonwoven fabric, and   each of said first nonwoven fabric and said second nonwoven fabrics has a heat resistant temperature of 270° C. or more.   
     
     
         2 . The hot press cushioning material according to  claim 1 , wherein
 said first nonwoven fabric and said second nonwoven fabrics have been joined together by needle punch.   
     
     
         3 . The hot press cushioning material according to  claim 1  or  2 , wherein
 said copolymerized para-aramid fibers include co-poly-(paraphenylene/3,4-oxydiphenylene terephthalamide) fibers. 
 
     
     
         4 . The hot press cushioning material according to  claim 1 , wherein
 said fibers that are more rigid than said copolymerized para-aramid fibers include poly(p-phenylene terephthalamide) fibers.