| 摘要 |
PCT No. PCT/SE86/00300 Sec. 371 Date Feb. 20, 1987 Sec. 102(e) Date Feb. 20, 1987 PCT Filed Jun. 19, 1986 PCT Pub. No. WO86/07580 PCT Pub. Date Dec. 31, 1986.A method and apparatus for the manufacture of filters in which a filter material in the form of a continuous length (5) is folded to form pleats (39). The pleats are attached to their ends along the lateral edges of the filter material and are sealed in this way one against the other so as to form a flow path for the medium which is to be filtered into the spaces between the pleats on one side of the filter material, through the material, and out into the spaces between the pleats on the other side of the filter material. During the process of attaching the ends of the pleats to one another, the pleats are kept separated from one another by a pre-determined distance between their outer folded edges by means of a device (18) provided with a number of combs (20) which extend inside the pleats and hold them in this way at the aforementioned pre-determined distance from one another. |
