simultaneous removal from a multi - level press of all press trays carrying particle board panels is achieved with a press unloading installation . such installation consists of a vertically movable press unloader cage having chain conveyor pairs , primary supports for the press trays and panels , and auxiliary supports for the trays alone after separation from the panels . the installation further includes a discharge device for removing the press trays from the auxiliary supports of the unloader cage . in order to shorten the return transport of flexible press trays , separation between the finished pressed particle board panels and the flexible press trays is accomplished in the press unloader cage .