Microporous tubes

Details Microporous tubes Microporous tubes

1977-09-12

1979-12-04

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264127, 264292, 521919, C08J 924

Patent

active

041773349

ABSTRACT:
Polytetrafluoroethylene resin tubes having small pore size and high porosity are produced by a process which includes stretching the tubes by drawing using a metal die and a metal plug. By using the die and plug, the stress necessary for stretching is converted to a compressive force in the thickness direction of the tube. This compressive force is an essential factor in producing the microporous structure of the tubes. In addition, when stretching is performed by drawing, a ratio of thickness to inside diameter of the tube of 0.07 or less can be easily achieved.

REFERENCES:
patent: 2985918 (1961-05-01), Moore et al.
patent: 3054761 (1962-09-01), Moore et al.
patent: 3170858 (1965-02-01), Muehlberg et al.
patent: 3281511 (1966-10-01), Goldsmith
patent: 3518332 (1970-06-01), Sklarchick et al.
patent: 3629383 (1971-12-01), Kometain et al.
patent: 3813461 (1974-05-01), Murayama et al.
patent: 3953566 (1976-04-01), Gore
patent: 3962153 (1976-06-01), Gore
patent: 4049589 (1977-09-01), Sakane

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