GB365035A - Improvements in or relating to the manufacture of insoles for boots or shoes - Google Patents

Abstract

Insoles for boots &c. are reinforced by applying to the non-tacky coated face of a strip of suitable width cut from a web of fabric coated with cement composition, a coating of cold viscous rubber cement composition and, while the composition is still cold, but tacky, applying a portion of the strip to the insole. The rubber cement composition contains rubber and a filler, such as zinc oxide, in approximately equal proportions, and Burgundy pitch in excess of the rubber content, dissolved in a very volatile solvent, such as naphtha solvent which is substantially free from the higher boiling point constituents usually found in such solvents. A thin coating of a composition containing 65 lbs. of rubber, 51 lbs. of zinc oxide, 22 lbs. of Burgundy pitch and 36 galls. of naphtha contained in a trunnioned receptacle is applied to a web of duck fed from a roll to a coating apparatus. The coated web is then passed over a series of steam pipes which drive off the volatile solvent and dry the web. The dry non-tacky coated web is wound on a roll and divided into a number of strips each of a width necessary to cover the insole, and the strips are further wound into rolls. A thicker coating of a composition containing 48 lbs. of rubber, 48 lbs. of zinc oxide, 60 lbs. of Burgundy pitch and 12 gallons of naphtha, preferably that distilling over between 165 DEG and 238 DEG F., is applied to the strips, the coating not extending to the edges of the strip. In a very short time the solvent in the second coating dries off or softens the first coating to unite the coatings into a single tacky coating for attachment to an insole. Pieces of the required length are cut from the strips and pressed into contact with the insole.