Porous film and porous film manufacturing apparatus
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United States of America Patent
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Oct 4, 1994
Grant Date -
N/A
app pub date -
Oct 9, 1992
filing date -
Oct 18, 1991
priority date (Note) -
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Abstract
This invention provides a porous film useful as a fresh fruit and vegetable wrapping material which is obtained by forming a large number of small recesses in an organic film and which does not allow permeation of water, bacteria, and viruses, but allows permeation of a gas, e.g., the oxygen gas or the carbon dioxide gas, and water vapor. The porous film includes the organic film and the large number of recesses formed in the organic film and having an average opening width of 0.5 .mu.m to 300 .mu.m and inner surfaces exhibiting affinity.
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