Method of strengthening polypropylene hose

Details Method of strengthening polypropylene hose Method of strengthening polypropylene hose

1983-12-02

1985-10-08

Czaja, Donald

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Forming continuous work followed by cutting

2642092, 2642093, 264234, 264339, 264345, B29C 1700, B29D 2304

Patent

active

045459479

ABSTRACT:
A method of treating polypropylene hose to increase its strength and durability is provided by flexing the hose through a plurality of 360 degree rotations while in a bent form to alternately axially compress and extend portions of the hose to increase the molecular alignment of the polypropylene.

REFERENCES:
patent: 2528528 (1950-11-01), Lyon
patent: 2920352 (1960-01-01), Miller et al.
patent: 3089187 (1963-05-01), Wolfe
patent: 3205289 (1965-09-01), Carpenter
patent: 3234312 (1966-02-01), Jordan
patent: 3470583 (1969-10-01), Denyes et al.
patent: 3491928 (1970-01-01), Boultinghouse
patent: 3843435 (1974-10-01), Strom
patent: 3919367 (1975-11-01), Maroschak

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