FLAT MEMBRANE ELEMENT AND METHOD FOR PRODUCING SAME
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United States of America Patent
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Nov 12, 2020
app pub date -
Nov 20, 2018
filing date -
Dec 4, 2017
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Abstract
The outer edge of a filtration membrane is thermally welded to a filter plate by a first thermal welding part. The first thermal welding part includes an outer boundary line disposed inside an outer edge of the filter plate and an inner boundary line disposed inside the outer boundary line. The outer boundary line has a plurality of first projected portions and first recessed portions that are alternately formed. The first projected portion projects toward the outer edge of the filter plate, and the first recessed portion is formed between the first projected portions and retracts in an inward direction A opposite to the outer edge of the filter plate.
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