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Publication of GB315280ApublicationCriticalpatent/GB315280A/en
315,280. British Celanese, Ltd., (Assignees of Dreyfus, C.) July 10, 1928, [Convention date]. Nonconducting coverings for heat and sound.- Cellulose esters or ethers such as cellulose acetate, formate, butyrate, propionate, or ethyl, methyl, or benzyl cellulose are employed in the form of fibres for heat and sound insulation. Suitable fibres are those of the order of 1-4 denier produced from a solution of cellulose acetate 1 part in acetone 3 parts by the usual methods. The fibres may be 1-5 inches in length and may be fluffed by agitation or blowing with air, and they may be subsequently treated by crinkling with boiling water. The fibres may be applied directly to the article to be insulated, or may be contained in jackets, and may be employed for insulating pipes, rooms, aircraft cabins, portable jars, refrigerators, and the like.
Improvements in or relating to the treatment of cellulose derivative filaments, yarns, fabrics and like materials to increase their extensibility and to the crinkling ofcellulose derivative staple fibre