Sandals There are many reasons for the deformation after the last generation.

(1) A shoe last Inconsistent with the soles of soles.

After gluing the last coat, the adhesive is heated and adhered to the bottom and heated. Sole The softness can be glued with the last shape, and after the shoe is broken, the soles will harden and the original shoe will be restored. The upper can only be driven by the bottom, so the distortion will be distorted.

(2) material factors

Some materials need heat setting, some need cold setting, and the performance of the material is different from that of thermal expansion and cold shrinkage. After the last, it will shrink due to the indeterminate shape, and it will also cause the deformation of the supporting body due to the contraction of the sole. Therefore, it is necessary to work out appropriate technological conditions and operating procedures.

(3) combination of bottoms and bottoms

The sandals, especially the fine strip structure, are evenly and properly distributed when the bangles are stretched, and whether the positions are accurate and correct; whether the space positions of the feet at the bottom of the feet are identical with those of the shoes (or even all the same shoes); whether the positioning of the insole on the last floor is accurate or identical, will cause the illusion of the last supporting surface losing the last support and shrink the reduction and deformation. It is recommended that sandals should be designed on the last and segmented on the last. It not only has an accurate combination point for the parts, but also helps the feet to have the depth line which is combined with the inner bottom.

(4) special handling of shoes and nose type sandals

The front nose and the rear tie belt should be strung up when the front nose part and the back tie belt are formed when the front shoe is connected with the back tie belt. The back belt should be beyond the position of the shoe nose junction (with a auxiliary strap to pull the rear tripping disc). After putting out the last, then tie the tie back into the nose and mouth. Otherwise, after the last shoe, the nose and rear tie belt must be tilted. This is determined by the styling factor of the nose and nose displacement and the rear trip belt twist.