Shoemaking Technology: Causes Of Deformation Of Sandals After Last Generation

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

(1) the stilts of shoe last and sole are not consistent.

After the last stretch, the rubber is heated and adhered to the bottom. After heating, the soles become soft and can be glued with the last type. After the last shoe, the soles are hardened and the original soles are restored. The shoe upper is soft and can only be driven by the bottom, so the distortion is 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

In particular, the fine strip structure, whether the force of the legs is uniform and proper during the stretch, whether the position is accurate and correct; whether the space position of the feet on the bottom of the shoe is identical with that of the pair of 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 support surface losing the last support and shrink the reduction 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 shoe nose displacement.

Determined by the factors of modeling.