1. Reach the vacuum forming by using of the sealed heating method to suit the vamp and last;
2. The standard pump down time is 3-5 minutes, the temperature is adjusted according to different leather;
3. Adjust the temperature according to the material of toe and heel of shoes for the best effect;
4. If the vacuum cooling is operated after pressing sole, the time of unforced cooling should be 10-15 minutes, can increase the hardness of back cover for the better effect of pulling last;
5. Be suitable for the small batch of production.