| 摘要 |
A porous filter device is made or formed from a porous membrane which is disposed on a rod and has two edges dependent downwardly from the rod, and the edges of the porous membrane will then be hot-pressed together with such as ultrasonic or hypersonic waves, or high frequency waves or the like to easily and quickly form a tubular or cylindrical and porous filter device. The welded edges of the porous membrane may then be cut and removed from the porous filter device when the porous filter device is supported on the rod or after the porous filter device is removed from the rod.
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