Molding of elongate, hollow, biaxially oriented thermoplastic sh

Details Molding of elongate, hollow, biaxially oriented thermoplastic sh Molding of elongate, hollow, biaxially oriented thermoplastic sh

1981-06-08

1983-12-20

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264573, B29C 1707

Patent

active

044217110

ABSTRACT:
An elongate, rigid, tubular, biaxially oriented thermoplastic, hollow thin-walled shaped article is molded by (i) introducing into an elongate mold cavity, the internal configuration and dimensions thereof corresponding to the exterior surface area of the desired shaped article, and aligning along the longitudinal axis thereof, a hollow tubular thermoplastic preform heated to the biaxial orientation temperature of said thermoplastic; (ii) expanding under internal pressure said heated preform to simultaneously, both longitudinally and transversely, uniformly stretch same, at least to the natural biaxial drawing ratio thereof, but to a value in the transverse direction of less than 100% of that ultimately desired; (iii) next further expanding said heated preform, under increased internal pressure, completely against the internal walls of the mold cavity to thus completely shape said ultimately desired shaped article; and (iv) then cooling said desired shaped article and releasing all pressure therefrom.

REFERENCES:
patent: 4034036 (1977-07-01), Farrell
patent: 4151250 (1979-04-01), Barry et al.
patent: 4177239 (1979-12-01), Gittner et al.

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