Method for controlling wall thickness in extruded tubular synthe

Details Method for controlling wall thickness in extruded tubular synthe Method for controlling wall thickness in extruded tubular synthe

1979-11-01

1981-07-21

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

2642091, 425376A, 425381, 425465, 425466, B29C 1707

Patent

active

042798574

ABSTRACT:
A mold has a core surrounded by an outer sleeve which defines with the core an annular axially extending passage. An adjustment element in the form of a ring or sleeve is displaceable in this passage so as to vary the radial dimension of a tubular blank that is extruded from the outlet end of the passage. The adjustment ring or sleeve may be elastically deformable by means of hydraulic cylinders or screws so as to create the desired thickness at the desired location, and may even be displaced during operation of the apparatus so as to vary the thickness of the blank from one region to another in the direction in which it is extruded.

REFERENCES:
patent: 3114932 (1963-12-01), Donnelly
patent: 3217360 (1965-11-01), Mason et al.
patent: 3221371 (1965-12-01), Stevens
patent: 3309443 (1967-03-01), Scott, Jr. et al.
patent: 3345690 (1967-10-01), Hagen
patent: 3390430 (1968-07-01), Lynch et al.
patent: 3440310 (1969-04-01), Makowski
patent: 3535739 (1970-10-01), Mehnert
patent: 3611494 (1971-10-01), Feuerherm
patent: 3801254 (1974-04-01), Godtner
patent: 3981672 (1976-09-01), Wilson

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