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US 3,945,535 AGranted
Injection molding apparatus
AssigneeSchloemann-Siemag Aktiengesellschaft
InventorsHans Peter Leiste, Helmut Eckardt
Life of this patent
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Abstract
Apparatus for feeding to a mold a plasticized synthetic material containing a foaming agent, the apparatus using a heated extruder and its associated transfer cylinder which emits the material in a thin stream by means of a nozzle.
Claims8
Apparatus for injecting a plasticized material containing a foaming agent into a mold from an extruder, comprising:
- a. a channel adapted to carry material from the extruder to the mold, the channel having an inner surface,
- b. a nozzle in the channel, the nozzle having a nozzle opening which forms a portion of the channel,
- c. a nozzle needle movable through the nozzle opening and having a frontal surface adapted to selectively close the nozzle opening,
- d. a heating element adapted to maintain the nozzle needle at a high temperature,
- e. a cooling system adapted to maintain at least a portion of the inner surface of the channel at a temperature below that of the nozzle needle, and
- f. carrying means adapted to move the nozzle needle to open and close the nozzle opening.
3 more elements
Dependencies are inferred from the claim text.