Method for Multi-Stage Expansion and Stretching of Film and Filter
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United States of America Patent
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Issued Date -
Dec 18, 2014
app pub date -
Jun 12, 2009
filing date -
Jun 13, 2008
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Abstract
This invention relates to a multi-stage stretching operation for production of expanded stretched porous polytetrafluoroethylene (ePTFE) fibrous materials with minimal node size and minimized filament sizes. A plurality of stretching or expansions may be implemented on the film including combinations of MDO and TDO stretches including at least two longitudinal stretches and at least one transverse stretch. Subsequent stretches occur at rates generally less than a prior similar longitudinal or transverse type of expansion.
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