Method and apparatus to control the density of products produced

Details Method and apparatus to control the density of products produced Method and apparatus to control the density of products produced

1979-03-22

1981-01-13

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 404, 264 406, 264 53, 425140, 425141, 425144, B29D 2700, G01G 1100

Patent

active

042448972

ABSTRACT:
Density of products produced from a foam extrusion process is controlled by measuring the thickness and the basis weight. The density is calculated and is compared to a target, or desired value, to produce an error signal. The error signal is used to control the density.

REFERENCES:
patent: 1984166 (1934-12-01), Walter
patent: 3185924 (1965-05-01), Locher
patent: 3474160 (1969-10-01), Doering
patent: 3890078 (1975-06-01), Straumanis
patent: 3914537 (1975-10-01), Cereijo et al.
patent: 4087499 (1978-05-01), Bayonnet
patent: 4088721 (1978-05-01), Apicella
patent: 4156913 (1979-05-01), Apicella

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