Mold for the injection molding of objects of large dimension and

Details Mold for the injection molding of objects of large dimension and Mold for the injection molding of objects of large dimension and

1979-11-09

1981-10-20

Flint, Jr., J. Howard

Static molds

Including means within surface to confine heat exchange medium

Mold part of particular material

249 79, 249103, 249160, 149142, B29C 500

Patent

active

042956285

ABSTRACT:
Mold for the injection molding of objects of large dimension and complicated surfaces from plastic material without internal stresses and with accurate dimension. In base plates of the mold cooling grids are embedded and the active surface of the base plates is provided with forming plates and forming strips with grooves for heating elements or tempering and cooling means. The mold is provided with mobile cores which change their positions in the course of shrinking of the solidifying plastic material.

REFERENCES:
patent: 2330277 (1943-09-01), Fritschle
patent: 2907070 (1959-10-01), Van Haitesoeldt
patent: 2972778 (1961-02-01), Wikkerink
patent: 3061880 (1962-11-01), Weisbach
patent: 3173175 (1965-03-01), Lemelson
patent: 3354509 (1967-11-01), Ammondson
patent: 3380121 (1968-04-01), Chittenden et al.
patent: 3536290 (1970-10-01), Terry
patent: 3723584 (1973-03-01), Nussbaum
patent: 3883109 (1975-05-01), Hahne
patent: 3999917 (1976-12-01), Knowles
patent: 4088295 (1978-05-01), Medovas et al.

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