Thermal alignment of cores and cavities in multi-cavity injectio

Details Thermal alignment of cores and cavities in multi-cavity injectio Thermal alignment of cores and cavities in multi-cavity injectio

1979-12-06

1980-12-16

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Temperature control

249 64, 249 78, 249 81, 249110, B29F 108

Patent

active

042394716

ABSTRACT:
This relates to an injection mold assembly wherein there is a plurality of cavities which are spaced from a center of the mold assembly and wherein each cavity has therein a core so that a thin wall article, such as a preform for a blow molded bottle, may be accurately formed by injection molding. Previously experienced differential in temperature and thus expansion differentials causing core-cavity misalignment are overcome in accordance with this invention by supplying the core retainer plate, which is normally cooler than the cavity retainer plate, with a heater for elevating the temperature thereof as required.

REFERENCES:
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patent: 3020594 (1962-02-01), Makowski
patent: 3159678 (1964-12-01), Scott, Jr. et al.
patent: 3173175 (1965-03-01), Lemeloon
patent: 3189948 (1965-06-01), Whitney
patent: 3499189 (1970-03-01), Perras
patent: 3520026 (1970-07-01), Stidham et al.
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patent: 3671159 (1972-06-01), Greenberg et al.
patent: 3751014 (1973-08-01), Waterloo
patent: 3774874 (1973-11-01), Clark
patent: 3807914 (1974-04-01), Paulson et al.
patent: 3911251 (1975-10-01), Day
patent: 4034952 (1977-07-01), Stewart

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