| 摘要 |
PROBLEM TO BE SOLVED: To make an intermediate rubber layer hold molding property, workability and the like and improve permeability resistance by mixing filler in a matrix made of rubber, and unevenly distributing the filler in an inner surface side of the intermediate rubber layer. SOLUTION: An intermediate rubber layer 12 is formed in such a constitution that a filler 22 is mixed in a matrix 20 made of rubber and the filler 22 is unevenly distributed in an inner surface side. A clearance between the filler 22 in the inner surface side of the intermediate rubber layer 12 is small in comparison with the case where the filler 22 is simply mixed, and a high density filling layer filled the filler 22 in a high density is formed. A bypass effect can be increased when a fluid to be permeated is advanced avoiding the filler 22, and a permeability resistance of the intermediate layer 12 can be improved. It is also possible to hold a molding property and a workability, since the filler 22 is unevenly distributed after the filler 22 is nearly uniformly dispersed and arranged in the matrix 20 by means of extrusion molding. |
