Influence of the type of material of the shoe upper on the determination of the general and residual deformation of the stiffeners

The article considers the allocation of deformations in the package of materials of the shoe upper under the action of loading its stiffener when determining the shape retention according to Standard 9135-2004 "Shoes. Method for determining the total and residual deformation of the toe puffs and stiffeners". The analysis of the influence of deformation load on samples of various leathers used in production for the manufacture of the stiffeners of shoes is carried out. The percentage, which is the residual deformation of the leather for the top of the shoe in the normalized value of the residual deformation of the shoe stiffeners, is determined.