Injection molding system having an insulation sleeve

Details Injection molding system having an insulation sleeve Injection molding system having an insulation sleeve

1983-09-29

1986-03-18

Czaja, Donald

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to heat or cool

425568, B29C 4503

Patent

active

045765677

ABSTRACT:
This invention relates to an injection molding system of the type wherein a heated probe is centrally located in the hot runner passage. The probe has a pair of circumferentially spaced melt channels, each with an upstream portion which branch out from a common central inlet to a downstream portion along the outer surface of the probe. The probe is seated in a well in the cavity plate and a hollow cylindrical insulating sleeve is located between the downstream portion of the probe and the wall of the well. The outer surface of the probe and the inner surface of the insulating sleeve have longitudinally extending grooves which are aligned to form the downstream portions of the melt channels. The insulating sleeve is formed of a thermoplastic material with low thermal conductivity and a high melting temperature. In addition to insulating, the sleeve provides the advantage that it avoids the space between the probe and the well wall filling with melt which often results in problems on color changes and the degradation of the stagnant material which is trapped.

REFERENCES:
patent: 2500401 (1950-03-01), Cossette
patent: 3520026 (1970-07-01), Stidham et al.
patent: 3800027 (1974-03-01), Tsutsumi

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