The so-called "parts" refers to the ability of the shoe upper to have the ability to convert after basic twists and turns, such as raising, dropping, and replenishing, but in order to bring the shoe closer to the actual curved surface. In the form, all parts where there is a joint between parts can be given the degree of fit required for the shape of the part where the part is located. This local degree of so-called part twist is not controlled by the strain angle. .
1. The appearance of parts in the exhibition plane is: the separation of the outline lines of the parts, a contour line between the parts of a shoe, in the exhibition plane, with two different outline lines to represent them. The part twists, in the production process, these two lines should be merged into a complete part outline. At this time, this part of the shoe upper must be made into a curved surface, which can be similar to the actual rolling surface. After passing through the upper part of the part, the curved surface is stable in shape and will not be deformed. The molding effect is ideal.
2. The position of the component's twist is, in principle, the joint of the two parts, must be based on the actual bending characteristics of the part with the surface, giving the appropriate part twist (referred to as part è··). However, the degree of component twisting also brings some difficulties to the processing. Moreover, there are some parts between the parts and the components, the twist is not obvious. Under normal circumstances, the component twist is mainly manifested between the Baotou and the middle gang, between the tongue and front Guomenkou Guo line, between the front chin and the back gusset.
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