▎ 摘　　要

NOVELTY - Seamless cylindrical filter bag is consists of a first non-woven fabric (9), a cylindrical cloth (10), a second non-woven fabric (11) and polytetrafluoroethylene microporous membrane (12) are compounded. The weaving of the cylindrical cloth is made by weaving on a circular loom or by knitting on a computerized flat knitting machine. USE - Seamless cylindrical filter bag. ADVANTAGE - The seamless cylindrical filter bag which avoids damage and tearing caused by the suture of the filter bag, and thoroughly solve the problem of damage to the filter bag fiber and base cloth caused by spunlace and needle punching and reduce the strength of the filter material, and improved the product quality and service life of the environmentally friendly filter material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the seamless cylindrical filter bag, which involves: (A) weaving first fiber into a cylindrical cloth by a circular loom or a computerized flat knitting machine; (B) forming second fiber into a single-layer fiber web by spun-bonding method or mixing and carding into a single-layer fiber web, which is cross-laid to form a multi-layer fiber web; (C) bonding multi-layer fiber web into a non-woven fabric by powder or paste points on a compound machine or using ultrasonic welding machine to bond the multi-layer fiber web into a non-woven fabric through heat energy; and (D) combining cylindrical cloth and non-woven cloth with polytetrafluoroethylene microporous membrane to form a cylindrical filter bag, where first fiber and second fiber are the same or different. DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of seamless cylindrical filter bag. First non-woven fabric (9) Cylindrical cloth (10) Second non-woven fabric (11) Polytetrafluoroethylene microporous membrane (12)