Controlling an extrusion blowing process

Details Controlling an extrusion blowing process Controlling an extrusion blowing process

1983-01-05

1984-10-02

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Measuring a weight or volume

264 401, 264 407, 264541, B29C 1707

Patent

active

044747160

ABSTRACT:
In extrusion blowing a hollow member, a preform is extruded and then blown in a mold to produce the final member. The weight of the hollow member is determined after its removal from the mold and compared to a reference value, thereby to adjust the size of the extrusion discharge opening to control the amount of material in the preform. The length of the preform is detected to control the movement of the mold thereby to keep a substantially constant length of extruded preform, while the time required to produce a preform is also maintained at a substantially constant value.

REFERENCES:
patent: 3583031 (1971-06-01), Holzmann et al.
patent: 3611494 (1971-10-01), Feuerherm
patent: 3759648 (1973-09-01), Hunkar
patent: 3795719 (1974-03-01), Morecrdkt et al.
patent: 3865913 (1975-02-01), Lachner et al.
patent: 3943214 (1976-03-01), Turek
patent: 4088721 (1978-05-01), Apicella, Jr.
patent: 4094620 (1978-06-01), Daubenbuchel
patent: 4097566 (1978-06-01), Bertin et al.
German Periodical "Plastverarbeiter," PV (23), 1972/1, p. 56
"Vortrage der Fachtaeung Extrusionblastformen," 1972.

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