GB568260A - Improvements in and relating to the concentration and desiccation of aqueous dispersions of gelatinising colloids and particularly aqueous dispersions of gelatin and glue - Google Patents

Abstract

568,260. Ice-making. KENYON, J., SILBERSTEIN, V., and ATTARI, H. March 12, 1943, No. 4064. [Class 29] [Also in Group V] Aqueous dispersions of gelatinising colloids, such as gelatine and glue, are concentrated by subjecting them to temperatures of 0‹ C. or below, whereby water separates and may form a layer of ice on top and a layer of a more concentrated dispersion, and can be removed ; any fat or oil present will form a layer on top of the separated water. The process may be carried out by applying the dispersion to a conveyer belt 11 which has passed through a chamber 13 supplied with cooled sterilized air. The conveyer passes into a chamber 18 containing cooling coils 20 and then into a chamber 24 supplied with warm sterilized air. The conveyer is tilted so that the water formed is delivered into a drip tray. The compartment 34, into which the conveyer next passes, is supplied with sterilized and, if necessary, heated air, and the concentrated dispersion is then carried through a cutting and sizing machine and delivered to a carrier 40 passing to a usual drying apparatus. The belt 11 returns through a chamber 41, where it is subjected to treatment by jets of hot water 42, brushes 44 and squeegees 45, a chamber 46 for treatment with steam squeegees 48 and a chamber 49 supplied with hot sterilized air. The dispersion used may have been prepared by the process described in Specification 568,261, [Group V].