... above laminated pieces into the lower room of the double-vacuum press. Then the upper room and the lower room ... kept vacuum, meanwhile heat the laminated pieces. 4. Press: Laminated pieces are heated under 135°C-140°C ... kept vacuum, that is to say, the upper room press on the laminated pieces of the lower room. 5 ... of the lower room, open the top of the press, and take out the laminated modules. Then cut ...