Method and apparatus of injection molding front grill panels of

Details Method and apparatus of injection molding front grill panels of Method and apparatus of injection molding front grill panels of

1987-06-19

1989-04-04

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

2642972, 425542, 425572, 425588, B29C 4527

Patent

active

048184624

ABSTRACT:
The front panel of an air conditioner unit or the like, including a louver-like intake grill comprising several transverse slats with outward-upward inclination is formed by injecting molten resin into cavities formed between a stationary mold and a movable mold along a parting line thereof, the molten resin being thus injected through pin-point gates formed on the stationary mold side and tab gates constituting parts of respective cavities and provided on the stationary mold side at part corresponding to the upper edge faces of the slats, the pin-point gates being connected to the upstream parts of the tab gates. By this method and apparatus a high feed rate of the resin is obtainable, and the molding time is shortened without impairment of the aesthetic appearance of the front panel due to unsightly cut marks left by the trimming of the residual sprue resin remaining in the pin-point gates.

REFERENCES:
patent: 2799435 (1957-07-01), Abplanalp
patent: 4269802 (1981-05-01), Linne
patent: 4500332 (1985-02-01), Gillingham

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