Device for determining the operational state of an extruder

Plastic article or earthenware shaping or treating: apparatus – With indicator – signal – recorder – illuminator – or inspection... – For molding temperature or pressure

Reexamination Certificate

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Details

C073S861000, C264S040300, C264S040700

Reexamination Certificate

active

06916165

ABSTRACT:
The invention relates to a device for determining the operational status of an extruder that is used for the productive of a plastic profile. At least one measuring device for determining the quality of the melt is provided in an adapter part between an extrusion cylinder (3) and an extrusion nozzle (5). An especially exact determination of the extruder state is possible if the measuring device comprises a tube through which melt is continuously drawn off from the adapter part during the measurement and on which at least one pressure is disposed.

REFERENCES:
patent: 3078513 (1963-02-01), Levison et al.
patent: 3365950 (1968-01-01), Park
patent: 3649147 (1972-03-01), Fritsch
patent: 5308232 (1994-05-01), Merzhanov et al.
patent: 5770129 (1998-06-01), Monti
patent: 5804718 (1998-09-01), Nagasaka et al.
patent: 6463810 (2002-10-01), Liu
patent: 2051568 (1972-04-01), None
patent: 3642757 (1987-07-01), None
patent: 19715630 (1988-10-01), None
patent: 4-302885 (1994-09-01), None
patent: 00899556 (1999-03-01), None
Patent Abstracts of Japan, vol. 013, No. 477 (M-885) Oct. 27, 1989 entitled “Measuring Device of Physical Property of High Molecular Substance Which is Being Processed” of JP 0188321 of Jul. 27, 1989.

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