The Dow Chemical Company

Femi O Kotoye

John M Kernstock

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.

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Midland, MI, United States of America

Femi O Kotoye