Raised and fused fabric filter and process for producing the same
AssigneeTeijin Limited
InventorTadashi Hirakawa
Life of this patent
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Abstract
A fabric filter having a low pressure drop, a high collection efficiency and an excellent cleanability is produced by raising one surface of a woven or knitted fabric comprising thermoplastic polymer fibers, to form a fibril layer containing therein the thermoplastic polymer fibrils, bringing the fibril layer into contact with a heating medium to form networks of fuse- bonded thermoplastic polymer fibrils on the fibril layer surface, and optionally, calendering the fabric.
Claims12
In a fabric filter comprising a woven or knitted fabric which comprises thermoplastic polymer fibers having a fibril layer which has been formed by raising a surface of said fabric and which is composed essentially of the thermoplastic polymer fibers, the improvement comprising a portion of said fibrils in said fibril layer being fuse-bonded to each other to form networks of said fuse-bonded fibrils on the surface of said fibril layer.
A process for producing a fabric filter, comprising raising a woven or knitted fabric which comprises thermoplastic polymer fibers, to form a fibril layer composed essentially of the thermoplastic polymer fibers on a surface of said fabric, contacting said fibril layer with a heating medium having a temperature higher than the melting point of said thermoplastic polymer fibers to fuse-bond a portion of said fibrils to each other and to form networks of said fuse-bonded fibrils on the surface of said fibril layer.
Dependencies are inferred from the claim text.