| 摘要 |
For use in the prepressing of laminated safety glass in which glass-plastic assemblies are sealed in individual plastic bags, a rectangular heating oven having a bottom wall provided with a longitudinally extending slot, a plurality of portable racks, each rack being provided with a solid base operating slot in the bottom wall of the oven and with a plurality of horizontal shelves positioned in spaced relation one above the other for supporting individual assemblies, the shelves being pivotally mounted and movable to a vertically inclined position to permit the placement of one of the assemblies on the next lower shelf or its removal therefrom. Each rack is provided with means for creating a vacuum in the associated plastic bags to withdraw the air therefrom as well as from between the laminations. Means are also included for advancing the racks through the oven in end-to-end abutting relation to close the slot and provide a substantially closed heating chamber in the oven. |
