Abstract
AbstractThe adhesion of phosphor to glass in the dried screen has been measured. It was found to depend on the quantity and composition of the solution left in the screen pores after removal of the bulk of the settling liquid. Adhesion was produced by drying of the solute. Delay between draining and drying allowed gelation to proceed, thereby reducing the quantity of dry binder available.Migration of solution through the screen towards the drying patch, if allowed to proceed for too long a time, caused uneven binder distribution.Measurement of the light output of screens under electron excitation confirmed the usual effect of variation in screen thickness on screen luminescence. Whilst controlling screen thickness, factors in settling were varied, but these factors were found to be irrelevant as long as good screen structure was maintained. Type and purity of potassium silicate had no effect within the usual settling range. Flocculation or very high silicate concentration depressed light output, but could be easily avoided.
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