Diffuser membrane and method of manufacture
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United States of America Patent
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Oct 24, 2017
Grant Date -
Dec 13, 2012
app pub date -
Jun 8, 2012
filing date -
Jun 10, 2011
priority date (Note) -
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Abstract
A diffuser membrane and a method for manufacturing the same are provided. In the method for manufacturing, a first material is heated and extruded to form a base layer and a second material is heated and extruded to form a coating layer. The base layer and coating layer may be extruded substantially simultaneously in a coextrusion process. Accordingly, the coating may be applied to the base layer in a manner that optimizes the bonding between the two layers and provides the ability to control the thickness of the coating layer. Alternatively, the base layer is formed initially and the coating layer is subsequently formed thereover. The first and second materials have differing properties. The first material may comprise polyurethane and the second material may comprise polyurethane and PTFE.
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