Flat membrane element and method for producing same
AssigneeKubota Corporation
InventorsKimihiro Ishikawa, Makoto Takahashi, Kenichi Tagawa
Life of this patent
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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.
Claims13
A flat membrane element comprising a sheet-type filtration membrane bonded to a surface of a filter plate made of thermoplastic resin,
- the flat membrane element including a thermal welding part in which an outer edge of the filtration membrane is bonded to the surface of the filter plate by thermal welding,
- wherein the thermal welding part is formed over an entire area between an outer boundary line inside an outer edge of the filter plate and an inner boundary line inside the outer boundary line,
- the outer boundary line has a plurality of projected portions and recessed portions that are alternately formed in a consecutive manner,
- the projected portions project toward the outer edge of the filter plate,
- the recessed portions are formed between the projected portions and retract in an inward direction opposite to the outer edge of the filter plate, and
- wherein the outer edge of the filtration membrane is disposed inside an outer end of the projected portions of the thermal welding part and outside an inner end of the recessed portions of the thermal welding part.
A method for producing a flat membrane element including a thermal welding part in which an outer edge of a sheet-type filtration membrane is bonded to a surface of a filter plate made of thermoplastic resin by thermal welding part,
- the method comprising:
- forming the thermal welding part over an entire area between an outer boundary line inside an outer edge of the filter plate and an inner boundary line inside the outer boundary line by pressing the outer edge of the filtration membrane with a hot projection of a hot plate in a state in which the filtration membrane is disposed on the surface of the filter plate to bond the filtration membrane to the filter plate,
- wherein the outer boundary line has a plurality of projected portions and recessed portions that are alternately formed in a consecutive manner,
- the projected portions project toward the outer edge of the filter plate while the recessed portions are formed between the projected portions and retract in an inward direction opposite to the outer edge of the filter plate and the filtration membrane is bonded to the filter plate while the outer edge of the filtration membrane is disposed inside an outer end of the projected portions of the thermal welding part and outside an inner end of the recessed portions of the thermal welding part.
Dependencies are inferred from the claim text.