Vacuum assisted application of thin vapor permeable, liquid impermeable coatings on apertured substrates and articles produced therefrom
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United States of America Patent
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Jun 9, 1998
Grant Date -
N/A
app pub date -
Nov 3, 1994
filing date -
Nov 3, 1994
priority date (Note) -
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Abstract
A process for the manufacture of a vapor permeable, liquid impermeable composite material comprising a three-dimensional apertured substrate having a vapor permeable, liquid impermeable coating material thereon, the substantially liquid impervious composite material, and an apparatus for making the composite material are disclosed. Successive portions of a continuous sheet of an apertured substrate are passed into contact with a continuous moving perforated member. The coating material is supplied onto the substrate. The coated substrate is subjected to a vacuum which causes the coating material to flow onto the substrate material and in certain embodiments, at least partially into the apertures in the substrate. The vacuum is maintained for a period of time sufficient for the coating material to adhere to the substrate. The coated portions of the substrate are continuously removed from the moving member.
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