Webbed plastic tubing

Details Webbed plastic tubing Webbed plastic tubing

1979-03-29

1980-12-16

Thurlow, Jeffery R.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including aperture

264146, 264154, 264163, 264209, 2642101, 264DIG47, B29C 1714

Patent

active

042398304

ABSTRACT:
A method and apparatus for making webbed plastic tubing suitable for use as a support for a filter pad in a cartridge filter. The webbed tubing is made by extruding a thermoplastic polymer in the form of a tube, cutting slits in the tube, and expanding the still warm and plastic tube by passing it over a mandrel slightly larger in diameter than the unexpanded tube.

REFERENCES:
patent: 2361369 (1944-10-01), Grebe et al.
patent: 3183571 (1965-05-01), Schmunk et al.
patent: 3313870 (1967-04-01), Yazawa
patent: 3790652 (1974-02-01), Colijn et al.
patent: 3819790 (1974-06-01), North et al.
patent: 3841815 (1974-10-01), Labarre
patent: 3947174 (1976-03-01), Hureau et al.

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