| 摘要 |
<p>PURPOSE:To prevent the air from being entrapped between a core and a skin by a method in which the space between a receiving holder and the skin is closed in the state where the skin is not brought in contact with the core, and said closed space therebetween is kept in vacuum condition. CONSTITUTION:In the state where the top force 33 which vacuum-molds sheet material 42 is held in the vacuum condition as it is, the bottom force 22b on which the surface of the bace plate 23 is coated with an adhesive layer is raised by the cylinder 21 for raising and lowering, and the raising process is stopped immediately before the rear surface of the sheet material 42 is brought in contact with the base plate 23. Then, a closed space (air tight chamber) is formed around the bottom force 22b by an elastic seal member 44, a box 22a, a keeping holder 41 and a seal member 42. While the vacuum condition of a top force 33 is kept, inner space 24 is allowed to communicate with vacuum source, whereby the air tight chamber of the bottom force is also kept in vacuum condition. The bottom force 22b is further raised, whereby the rear surface of the sheet material 42 is caused to adhere to the upper surface of the base plate 23. Further, the vacuum condition of the top force 33 is switched to pressurized state by a switching valve 36, and while the adhesion of the sheet 42 to the base plate 23 is heightened by air pressure, the mold release from the top force 33 is contrived.</p> |
