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US 2022/0136168 A1Published application
Process for producing polyvinyl alcohol articles
OwnerNovis Smith, Charles Robersoninventors
Life of this patent
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Abstract
The present invention provides a process for modifying the surface of a polyvinyl alcohol film or fabric by applying heat and pressure to the film or fabric to increase the moisture on the surface which is held by the fabric and to coalesce the surface fibers and reduce the porosity of the surface.
Claims21
-13. (canceled)
A polyvinyl alcohol film or fabric comprising:
- a first outer surface;
- and
- a second outer surface opposite the first outer surface, wherein the first outer surface and the second outer surface are an integral one-piece construction formed from a starting polyvinyl alcohol material;
- wherein the first outer surface has been treated to have a reduced surface porosity relative to a surface porosity of the second outer surface.
1 more element
A method of making a polyvinyl alcohol film or fabric comprising:
- subjecting a starting polyvinyl alcohol material to heat and pressure by passing the material through a pair of opposed calendar rollers to reduce a surface porosity of only one of two surfaces of the material;
- and
- cooling the material after the step of subjecting, wherein the reduced surface porosity of the only one surface of the material is retained during the step of cooling.
Dependencies are inferred from the claim text.