Method of making an aerator membrane

Details Method of making an aerator membrane Method of making an aerator membrane

1993-09-10

1995-05-02

Seidel, Richard K.

Cutting

Processes

Puncturing

83660, 83733, B26F 124

Patent

active

054109256

ABSTRACT:
The aeration field of an aerator membrane is formed by perforating the membrane with a rotary device having a plurality of perforating tools. The membrane also rotates while it is being perforated, and the membrane and tool simultaneously move in a radial direction, with respect to the membrane, so that a spiral line of perforations results.

REFERENCES:
patent: 677257 (1901-06-01), McDonnell
patent: 3811352 (1974-05-01), McFadden
patent: 3822617 (1974-07-01), Weichel

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