RAM Extruders
AssigneeBarwell Machine and Rubber Group Limited
InventorsPeter R. Wills, Richard C. Cowley
Life of this patent
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Abstract
The disclosure relates to a ram extruder including an extruder barrel having an extrusion die at one end and a hydraulic ram at the other end having a piston which is advanced along the barrel by the ram to displace material in the barrel through the extrusion die. To facilitate loading of the barrel a loading port is provided in the side of the barrel adjacent said other end of the barrel through which the barrel may be charged after retraction of the piston following an extrusion operation and a port closure device is provided to close the port after extrusion and evacuate air from the barrel prior to advancing the piston past the port to minimize the air contained in the barrel prior to the extrusion operation.
Claims14
A ram extruder, comprising:
- an extruder barrel to receive material to be extruded, said extruder barrel having a first and a second end,
- an extrusion aperture at said first end of the barrel,
- a loading port located towards said second end of the barrel,
- a piston slidably received by the barrel,
- drive means to advance the piston from a retracted position located beyond the loading port approximate said second end of the barrel to advance the piston along said barrel towards said first end to extrude material in the barrel through the extrusion aperture and to return the piston to the retracted position at the end of the extrusion operation,
- means to close the loading port in the barrel,
- means to evacuate air from the barrel through the closing means prior to the advancing of the piston past the loading port for an extrusion operation, and
- a vacuum passageway in said piston through which air is extracted from the barrel from in front of the piston as the piston advances along the barrel.
Dependencies are inferred from the claim text.