Method and apparatus for the continuous monitoring and control o

Details Method and apparatus for the continuous monitoring and control o Method and apparatus for the continuous monitoring and control o

1974-09-30

1976-04-27

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250226, 264 40, 356209, H01J 3912

Patent

active

039537390

ABSTRACT:
A method and apparatus are provided to continuously monitor and measure the average size of individual foam cells contained in a foam structure, such as polystyrene foam for example, as it is being fabricated. Such an arrangement permits the prompt adjustment of process conditions and/or the concentration of nucleating agents in the extrusion system in the event the foam cell size deviates from a preselected norm. The method comprises illuminating the surface of a foam sheet, receiving and collecting at least a portion of the light which is diffused and reflected from the foam sheet with a detector photocell, electrically measuring the amount of light energy received by the photocell and converting such measurements into a cell size measurement.

REFERENCES:
patent: 2891722 (1959-06-01), Nuttall et al.
patent: 3368007 (1968-02-01), Palmer
patent: 3646188 (1972-02-01), Campbell
patent: 3695765 (1972-10-01), Bol et al.
patent: 3797937 (1974-03-01), Shofner

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