Coating processes – Measuring – testing – or indicating
Patent
1986-05-22
1988-01-05
Lawrence, Evan K.
Coating processes
Measuring, testing, or indicating
73 32R, 118688, 137 5, 137 88, B05D 500, B05C 1110
Patent
active
047175826
ABSTRACT:
A method and apparatus for controlling the density of a foam. The method involves measuring the electrical conductivity of a foam wherein the electrical conductivity of the foam varies with the density thereof and adjusting the density of the foam in response to the measured electrical conductivity to prepare a foam having a desired density. The apparatus comprises means for generating and applying a foam, said means being connected by an enclosed pathway. Located within the enclosed pathway is an electrical conductivity sensor. The conductivity sensor is electronically connected to a translation means. The conductivity sensor provides an electrical signal, related to conductivity of the foam, to the translation means. The translation means is connected to a gas flow controlling means. Based on the signal received from the conductivity sensor, the translation means provides a signal to gas flow control means which influences gas flow control means to increase or decrease the density of the foam thereby to produce a foam having the desired density.
REFERENCES:
patent: 4620983 (1986-11-01), Zimmer
Kernstock John M.
Kotoye Femi O.
Kanuch B. M.
Lawrence Evan K.
Mielke T. J.
The Dow Chemical Company
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