Brief description of the stiffening of a boot upper

摘要

Process for stiffening a selected are of flexible sheet material, particularly a part such as the counter portion of a shoe upper, in which a predetermined quantity of hot molten resin is deposited on the area as a body of substantial thickness, the area is pressed to spread out and adhere the resin as a layer and thereafter the resin is cooled to a stiff resilient condition. The sheet material may be removed from the first pressing operation and subjected to a second pressing or molding operation around a form such as a last. In this second pressing, molten resin which has been squeezed from the area onto the lasting margin, by controlled conditions in the first pressing may be employed as lasting cement by wiping down the lasting margin against the bottom surface of an insole.