FREMGANGSMAADE OG APPARAT TIL AT REGULERE MASSEFYLDEN AF ET SKUM

摘要

The density of a foam is controlled by measuring the electrical conductivity of the foam and adjusting its density in response to the measured electrical conductivity. Apparatus for carrying out this method comprises means (10) for generating a foam connected by an enclosed pathway (13) to an application outlet (14). Located within the pathway (13) is an electrical conductivity sensor (15) which is electronically connected (16) to a translation means (17). The translation means (17) is connected (18) to a gas glow controlling means (19) whereby, in response to the signal received from the conductivity sensor (15), the translation means (17) provides a signal to the gas glow control means (19) to vary gas supply to the means (10) for generating the foam. The invention provides an accurate method of controlling the density of the foam within a narrow range, thus enabling the application of the minimum amount of foam necessary to achieve the desired physical properties.