An apparatus for dry manufacturing rigid cellulose products having essentially non-flat general shape comprising a disintegrating unit, a cellulose blank forming unit, and a product forming unit. The cellulose blank forming unit comprises a dispenser for guiding a cellulose fibre carrying air flow from the disintegrating unit, and a forming drum having an outer surface comprising perforations. The outer surface is configured for receiving cellulose fibres and forming a continuous or discontinuous cellulose blank, and comprises a first area having a first perforation density and a second area having a second perforation density less than the first perforation density for forming the cellulose blank with higher grammage at first locations originating from the first area than at second locations originating the said second area. The apparatus further comprises an air removing device arranged inside the forming drum, and a support structure for receiving the cellulose blank from the forming drum.

A method and system for removing material build-up, including, but not limited to, boric acid or boric acid-based material, on a press platen. A thermosetting resin is deposited on the upper surface of a manufactured wood chip or strand mat, which is then subjected to heat and pressure in a press. During pressing, the build-up material on the press platen(s) will soften and/or melt, and will adhere to the to thermosetting resin on the top of the mat. After pressing, as the formed panels are removed from the press, the boric acid build-up adhering to the thermosetting resin is pulled off the press platens and is removed with the formed panels. The panels with the buildup may then be processed for appropriate uses or dispositions.

The invention relates to an apparatus (100) and method for dry manufacturing rigid cellulose products having essentially non-flat general shape. The apparatus (100) comprises a disintegrating unit (3), a multi-stage cellulose blank forming unit (30) and a product forming unit (40) for producing rigid cellulose products (14). The multi-stage cellulose blank forming unit (30) comprising a dispenser for guiding a cellulose fibre carrying air flow from the disintegrating unit (3), a first forming drum (15) having an outer surface configured for receiving cellulose fibres originating from the dispenser and for forming part of the cellulose blank (13), by means of a first air removing device (54) arranged inside the first forming drum (15), a second forming drum (15) having an outer surface configured for receiving cellulose fibres originating from the dispenser and from the outer surface of the first forming drum (15) and for forming the continuous or discontinuous cellulose blank (13), by means of a second air removing device (54) arranged inside the second forming drum (15), and a support structure (8) for receiving the continuous or discontinuous cellulose blank (13) formed on said second forming drum (15).

In variants, the system can include a press frame, a set of conveyor systems, a set of core units, a set of pressure control systems, a power source, and/or any other suitable system components. The system components can cooperatively form a continuous press for manufacturing composite boards from composite board material by applying pressure and/or heat to the composite board material. In variants, the system can provide a modular, extensible, and lightweight continuous press that can be elongated or shortened by adding or removing modular core units to the core section.