FILTRATION MATERIAL HAVING ePTFE AND METHOD OF MAKING

Disclosed herein is filtration material having expanded polytetrafluoroethylene (ePTFE) and method of making. The method comprises expanding polytetrafluoroethylene in a machine direction orienter (MDO) and expanding or stretching to a ratio from about 20:1 up to about 100:1. The sheet of polytetraf...

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Bibliographic Details
Main Author CHOI, KYUNG-JU
Format Patent
LanguageEnglish
Published 15.11.2018
Subjects
AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR
SHAPING OR JOINING OF PLASTICS
TRANSPORTING
WORKING OF PLASTICS
WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Summary:Disclosed herein is filtration material having expanded polytetrafluoroethylene (ePTFE) and method of making. The method comprises expanding polytetrafluoroethylene in a machine direction orienter (MDO) and expanding or stretching to a ratio from about 20:1 up to about 100:1. The sheet of polytetrafluoroethylene is then relaxed. Upon relaxing the sheet of polytetrafluoroethylene, the sheet of polytetrafluoroethylene is fed into a transverse direction orienter (TDO). The temperature of the sheet of polytetrafluoroethylene in TDO is maintained to remain below 200° C. The sheet of polytetrafluoroethylene is then expanded or stretched to a ratio from about 1.5:1 up to about 100:1, with the TDO, thus providing the expanded polytetrafluoroethylene of the present disclosure having increased tensile strength and finer filaments.
Bibliography:Application Number: US201615326616