| abstract |
In a simultaneous molding to one piece, at a time of heat molding of a surface skin material 3, after an edge part of the surface skin material 3 is folded back to an inside direction of the mold pattern and is formed up a folded back part 7 along a mold pattern for folding back 6 which is placed as in a manner of projecting from an opening edge 2b of a cavity face 2a toward the inside direction of the mold pattern, the mold pattern for folding back 6 is removed, and then at a time of the expansion molding, one face 7a of the folded back part 7 is melt united to one piece with a back face 5b of the cellular molded article in a mold pattern 5, and at the same time, a folded returning part 8, which is in a state that an outer edge part of the surface skin material 3 is folded returning toward an outside direction of the mold pattern from a tip 7c of this folded back part 7, is pressed so as to pile on the other face 7b of the above-mentioned folded back part 7. |