| 摘要 |
When, according to the invention, making a filter cartridge of pleated material by a method wherein the layers of material ( 1, 2 ) are disposed with a small overlap ( 3 ), and then, by means of a welding tool ( 5, 6, 7 ), welding the material starting at the center and then to each side until the entire overlap has been welded together, the expansion of the material in the welding may be accommodated, without the welded-together filter material losing its shape.
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