| 摘要 |
A filter bag of thermoplastic material for filtering solids from gases has a longitudinal joint formed by fusing together overlapping edge portions of the material so as to form a tubular body. In an apparatus for forming the filter bag, a heating element which is shaped like a blade heats the thermoplastic material to at least the softening point and a pair of opposing rollers are adapted to compress the heated material so as to form the fused seam.
|
