Electrically heated pin-point gate
OwnerWolfgang Zimmermaninventor
Life of this patent
Estimating the term…
Abstract
To provide a thermodynamic pinpoint gate nozzle which will permit a so-called cosmetic gate without stringing, and during which the plastic material to be processed is not subjected to high viscous or shear stress by the heating elements placed inside the nozzle channel, it is provided that the pinpoint gate nozzle on the side facing the mold cavity exhibits a low-mass inside nozzle (7) and that inside nozzle (7) can be heated by an ohmic resistance wire either inductively or by inside nozzle (7) formed as a Peltier element.
Claims13
An electrically heatable pinpoint gate nozzle for an injection molding machine said gate nozzle comprising:
- means defining an axially extending central flow channel having a gate opening for allowing flow of plastic material into a mold cavity of a molding machine;
- a conical inside nozzle in said flow channel formed of a thermally conductive wear-resistant material and located adjacent said gate opening on an upstream side thereof;
- said inside nozzle surrounding said gate opening and having a central flow path in communication with said flow channel and said gate opening;
- means carried by said gate nozzle for heating the inside nozzle;
- and
- a lug carried by the nozzle and formed of thermally conductive material, said lug being disposed perpendicular to a longitudinal axis of said flow channel and in thermal contact with said inside nozzle, whereby heat transfer during a cooling period is dependent upon the thickness of the lug.
An electrically heatable pinpoint gate nozzle for injecting plastic material into a cavity of a molding machine, said gate nozzle comprising means defining a nozzle body having a central flow channel for the plastic material, a low mass inside nozzle located inside said central flow channel and facing the mold cavity, said inside nozzle including a Peltier element for heating said inside nozzle and means for supplying electrical energy to said Peltier element.
Dependencies are inferred from the claim text.