There are many reasons why sandals are deformed after being worn out. There are mainly the following:
(1) Inconsistent shoe soles and soles
After stretching, brushing glue warms the sticky bottom. After warming, the soles can be softened, and the soles can be glued together. After the cut, the soles can be hardened to restore the original skeleton. The upper can only be driven with the softness of the upper, so it is distorted.
(2) Material factors
Helpers need heat setting, and some require cold setting. The performance of the substrate is different from that of the thermal expansion and contraction. After the ejection, it will shrink due to the deformation of the helper, and the body will deform due to the contraction of the sole. Therefore, it is necessary to formulate suitable process conditions and operating rules for the materials.
(3) Bottom combination operation
Sandals help, especially in thin straps, whether the force of the various helper legs is even and proper when the bandages are applied, whether the position is correct and correct, and whether the same pair of shoes (or even all shoes with the same number) have the same spatial position on the inner sole; Whether the bottom is positioned accurately on the bottom or not is likely to cause the illusion that the helper's face will lose its support and contract and reset. It is recommended that the sandals be designed on the upper part of the sandals. Not only has the exact point of attachment for the part, but also has a depth line (stretching amount line) in combination with the insole, and an insole line for the insole (for milling or sanding by the line) For assembly operations.
(4) Special treatment of shoe and nose structure sandals
In the case of a frontal nose piece and a back band, the front nose and rear band must be separated and stretched. Auxiliary straps will position the rear chin strap. After licking, wear the back chin strap and wear it through the nose of the shoe. Otherwise, the shoe nose and the rear belt must deform. This is determined by the sculpting factors of the shoe nose displacement and the rear twist belt.
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