Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-05-03
1991-02-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022711, 250238, G01N 2186
Patent
active
049946803
ABSTRACT:
A photoelectric measurement head (26) for the monitoring of the cross-section of a profiled section between an extruder and a calibrating device of an extrusion press for the manufacture of plastic profiled sections (24) is provided in the region of a free head end of the measurement-head housing (30) with two light-passage openings (38, 42) for a light outlet and light inlet respectively. The light passage openings are arranged on opposite sides of a passage (40) for the profiled section. In each opening (38, 42) a light-transmitting glass cover (64, 66) is inserted. Furthermore, two heating elements (60, 62) are inserted in the measurement-head housing (30) in the region of its free head end in the direct vicinity of the glass covers (64) and (66). The heating elements are connected to a temperature-setting device which maintains the temperature of the free head end of the measurement-head housing at the temperature of the profiled section (24) at the nozzle outlet of the extruder.
REFERENCES:
patent: 4564765 (1986-01-01), Blaich
patent: 4716942 (1988-01-01), Jensen et al.
Casella Anthony C.
Hespos Gerald E.
Kunststoff-Verarbeitung GmbH Dirk A. Brugmann
Nelms David C.
Shami K.
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