| 摘要 |
A method for assembling a porous membrane cartridge having a cylindrical barrel, a cap, and a porous membrane. The method includes: forming openings at a top end and rear end in the barrel, respectively; forming the cap into a cylindrical shape having a fit-in portion configured to fit the portion outside the top end of the barrel, and forming in the cap a sandwiching face configured to abut with an opening edge of the top end and to sandwich the porous membrane between the barrel and the sandwiching face; crushing a peripheral edge of the porous membrane and sandwiching the porous membrane; and fixing the cap to the barrel so as not to be pulled out of the barrel by welding the opening edge and the sandwiching face by ultrasound.
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