Producing method of film with through-holes
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United States of America Patent
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Apr 6, 2004
Grant Date -
May 24, 2001
app pub date -
Jan 25, 2001
filing date -
Sep 30, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A film is made of an elastic material. The film is stretched in at least one direction in parallel to a surface of the film. Then, through-holes are punched in the film be means of needles, in a state the film is stretched. After the punching is completed, the stretching is terminated, so that the film recovers its original shape.
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