Abstract: A horizontal multistage press apparatus 1 (multistage drying apparatus) includes conveyance paths R1 to R4 (first to fourth conveyance paths) in which the veneer sheet W1 (sheet material to be treated) is carried out in a standing state. The conveyance path R1 is positioned over between the loader device 10 and the hot press device 20, the conveyance path R2 is positioned over between the hot press device 20 and the open transpiration device 40, the conveyance path R3 is positioned over between the open transpiration device 40 and the temperature control press device 50, and the conveyance path R4 is positioned over between the temperature control press device 50 and the unloader device 60. The conveyance paths R1 to R4 are arranged in a straight line in plan view.

Abstract: A horizontal multistage press apparatus 1 (multistage drying apparatus) includes conveyance paths R1 to R4 (first to fourth conveyance paths) in which the veneer sheet W1 (sheet material to be treated) is carried out in a standing state. The conveyance path R1 is positioned over between the loader device 10 and the hot press device 20, the conveyance path R2 is positioned over between the hot press device 20 and the open transpiration device 40, the conveyance path R3 is positioned over between the open transpiration device 40 and the temperature control press device 50, and the conveyance path R4 is positioned over between the temperature control press device 50 and the unloader device 60. The conveyance paths R1 to R4 are arranged in a straight line in plan view.

Abstract: A horizontal multistage press apparatus 1 (multistage conveyance apparatus, multistage press apparatus) includes: a loader unit gripping body 70A or an open transpiration unit gripping body 70C (upstream side conveyance body) for carrying out the veneer sheet W1 with the upper part of the veneer sheet W1 (sheet material to be treated) gripped and suspended from the loader device 10 or the open transpiration device 40 (first treatment device), and a hot press unit gripping body 70B or a temperature control press unit gripping body 70D (downstream side conveyance body) for carrying the veneer sheet W1 into the press position of the hot press device 20 or the temperature control press device 50 (second treatment device) with the gripping position of the veneer sheet W1 shifted from the upper part to the lower part and supported.