Method and apparatus for protecting a screw extruder producing s

Details Method and apparatus for protecting a screw extruder producing s Method and apparatus for protecting a screw extruder producing s

1989-06-15

1990-06-05

Nelson, Peter A.

Plastic and nonmetallic article shaping or treating: processes

Explosive or propellant article shaping or treating

Extrusion to form sheet or rod

1491096, 422163, C06B 2100

Patent

active

049312294

ABSTRACT:
A method and apparatus for protecting a mixing apparatus for producing strand-shaped explosives and propellants in a twin-shaft screw extruder, the housing of which is formed of housing parts connected to a clamping device acting under hydraulic pressure. In order to compensate for excessive pressure and to prevent abrupt opening of the mixing chamber, the torque developed at the screw shafts is continuously monitered and fed to a control and storage device together with temperature and pressure values measured at the end of the screw shaft in the material being processed. If one of the measure values exceeds a permissable limit, a signal is produced to change the operating condition of the screw extruder, particularly to stop and withdraw the extruder from the housing, to halt the drive motor of the extruder shafts and to open the extruder housing by relieving the clamping device.

REFERENCES:
patent: 4335063 (1982-06-01), Kolb et al.
patent: 4525313 (1985-06-01), Muller
patent: 4585600 (1986-04-01), Rollyson et al.

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