Method of press-forming corrugated paperboard into curved board and apparatus for same
 In a method of press-forming a planer board of corrugated paperboard into a curved board which serves as the substrate of, for example, an automobile roof trim board by utilizing a thermoplastic adhesive in the production of the corrugated paperboard and applying heat to the planer board through dies in a hot-press, the liners of the corrugated paperboard are prevented from wrinkling by preheating the planer board so as to soften the thermoplastic adhesive therein immediately before placement between the dies. An apparatus to perform this method comprises a board carrier which has heaters and can carry the planer board into the hot-press with continued heating of the board. 
Nissan Motor Company, Limited
Y B Y B Y B B B
Y10T B32B Y10T B31F Y10T B32B B32B B60R
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Toshihiko
Fujii