Method for controlling injecting and mold clamping in a blow mol

Details Method for controlling injecting and mold clamping in a blow mol Method for controlling injecting and mold clamping in a blow mol

1992-04-29

1993-12-14

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Positioning of a mold part to form a cavity or controlling...

264 401, 264 407, 264540, 425140, 425150, 425532, B29C 4904, B29C 4978

Patent

active

052699854

ABSTRACT:
A method and apparatus for injecting and mold clamping control of an injection blow molding machine, wherein a parison injected downward from a die between mold halves defining a cavity is detected to thereby determine the dynamic locus of its free end. In every run the mold clamping is commanded to start before the end of injection is commanded and is effected according to the clamping operational conditions determined based on the parison locus determined in the instant or preceding run. In one method a clamping starting time is determined by a calculation with a predetermined clamping stroke speed. In another alternative method an initial clamping stroke speed is determined by a calculation with a predetermined clamping starting time and following stroke speed. In the alternative methods the end of injection is commanded at the time, predicted by a calculation, when the free parison end reaches a predetermined vertical position down from the end of the cavity where the inner horizontal end of each mold half is spaced a predetermined horizontal distance from the outer face of the parison. The mold clamping is switched from the initial stroke speed to the following speed at the predicted time.

REFERENCES:
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patent: 3970418 (1976-07-01), Turek
patent: 4094620 (1978-06-01), Daubenbuchel et al.
patent: 4444702 (1984-04-01), Thomas et al.
Patent Abstracts of Japan, vol. 8, No. 124 (M-301) (1561) Jun. 9, 1984 (corres. to JP-A-59 029 131 (Kao Sekken K.K.) Feb. 1984).
Patent Abstracts of Japan, vol. 4, No. 111 (M-25) (593) Aug. 9, 1980 (corres. to JP-A-55 069 422 (Ishikawajima Harima Jukogyo) May 26, 1980).
"Regelung der Vorformlinglange beim Extrusionblasformen", 279 Kunststoffberater, No. 10, Oct. 28, 1983, pp. 48-50.
"Regelsystem fur die Vorformlinglange", 4020 Plastverarbeiter, vol. 38, No. 11, Nov. 1987, pp. 70-80.

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