Device for providing a seal on a drive shaft of an extrusion mac

Details Device for providing a seal on a drive shaft of an extrusion mac Device for providing a seal on a drive shaft of an extrusion mac

1990-05-31

1992-04-21

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Feed control of material en route to shaping area

425146, 425207, 425208, B29C 4700

Patent

active

051062860

ABSTRACT:
A seal on a drive shaft of an extrusion machine having a housing, is provided by a sealing chamber through which the shaft, for example the drive shaft of the shear spindle, extends in entering the housing, and a sealing screw thread on a portion of the shaft in the sealing chamber, the sealing screw thread having a screw direction for propelling material toward the interior of the housing. Sealing material in the form of granular plastic material is fed to the sealing chamber at a controlled rate by a device having a storage container for the granular plastic material, the bottom of the container having a funnel feeding the granular plastic material into an elongate cavity which communicates with the sealing chamber and in which the piston rod of a piston-cylinder unit is reciprocable to propel the granular plastic material into the sealing chamber. The pressure inside the sealing chamber is sensed and the operation of the piston-cylinder unit is controlled to maintain the pressure approximately constant. Fluid is circulated in a channel in the wall of the sealing chamber to keep the temperature of the chamber below the melting temperature of the granular plastic material.

REFERENCES:
patent: 2722716 (1955-11-01), Henning
patent: 3217364 (1965-11-01), Genest

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