Patent ID: 11865802
Assignee: OTRAJET INC.
Field: Other special machines (Mechanical engineering)
Classification: CPC B  A | IPC B

Claim 2:
3. The method for molding and forming the flip-flop as claimed in claim 2, wherein in the step D of venting the back-pressure gas, venting the back-pressure gas located in the strap area first, the polymer raw material accumulating around orifices of the connecting areas blocking the back-pressure gas in the sole area from entering the strap area to reduce a back pressure value of the strap area or reduce it to vacuum, thereby causing a pressure value of the strap area to be less than a back pressure value of the sole area, a pressure difference between the strap area and the sole area forcing the polymer raw material to flow from the sole area to a slender and elongated space of the strap area, venting the gas in the sole area after filling the strap area fully with the polymer raw material, and then venting all the back-pressure gas out of the mold chamber.