Injection molding apparatus reducing counteractive deformation o

Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With coupling between charger and mold

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2642972, 2643288, 26432811, 425574, 425588, B29C 4532

Patent

active

049682431

ABSTRACT:
An injection molding apparatus for high pressure injection molding of thermoplastic materials reduces counteractive deformation of desynchronously filled coaxially located molded cavities. The apparatus includes a clamping apparatus having left, center and right molding blocks for movement with respect to each along a common axis and defining first and second molding cavities. The center block includes left and right platens separated by a multitude of supporting columns. At least one of the columns is at least partly positioned above a first horizontal plane which is located at least 30% of a distance from the axis to a top of the platens and at least one of the columns is at lest partly positioned below a second horizontal plane which is located at least 30% of a distance from the axis to a bottom of the platens. Columns are similarly positioned in relation to first and second vertical planes. A top group of the supporting columns is located at least partly above a horizontal plane through said axis, and a bottom group of the supporting columns is located at least partly below said horizontal plane. The top group of supporting columns covers at least 10% of a top platen area above said horizontal plane and the bottom group of supporting columns covers at least 10% of a bottom platen area below said horizontal plane. Front and rear groups of the supporting columns are similarly located with respect to a vertical plane through said axis.

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patent: 4464327 (1984-08-01), Sorensen
patent: 4539171 (1985-09-01), Sorensen

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