Method of making filter cell having sealed periphery

Details Method of making filter cell having sealed periphery Method of making filter cell having sealed periphery

1981-04-13

1982-08-31

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Prestressing solid body and uniting in stressed condition

264250, 264258, 264263, 264DIG48, B29C 604

Patent

active

043472087

ABSTRACT:
A method is provided for making a filter cell comprised of two cellulosic fiber containing filter media having a sealed periphery. The method comprises compressing the peripheries of each filter media, to form a flange. The media are then aligned to provide intimate face-to-face contact between the flanges. A spacer means is provided between the media to cause each to dish outwardly from the other media. The two media and spacer means are then placed into a mold surrounding the flanges. The mold has a means for providing a recompression force to the inner portions of the flanges. A thermoplastic polymer is then injected into the mold to form a seal around the flanges. The recompression force is sufficient to maintain the flanges in intimate face-to-face contact with each other and to prevent seepage of the polymer between the flanges when the polymer is injected into the mold. The sealed periphery is reliable, economical to produce, resistant to cracking, provides enhanced support for the filter media, and permits the production of a filter cell having low extractables.

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