Method and apparatus for dry manufacturing rigid cellulose products

Apparatus for dry manufacturing rigid cellulose products having essentially non-flat general shape, the apparatus comprising:

• a disintegrating unit for providing a quantity of separated cellulose fibres from a cellulose raw material,
• a multi-stage cellulose blank forming unit comprising a dispenser for guiding a cellulose fibre carrying air flow from the disintegrating unit, and wherein the multi-stage cellulose blank forming unit is configured for forming a continuous or discontinuous cellulose blank having different grammage at different locations from said quantity of separated cellulose fibres transported by the air flow via the dispenser, and
• a product forming unit for producing rigid cellulose products having essentially non-flat general shape from the cellulose blank by pressing,
• characterized in that the multi-stage cellulose blank forming unit comprises:
• a first forming drum having an outer surface configured for receiving cellulose fibres originating from the dispenser and for forming part of the cellulose blank, by means of a first air removing device arranged inside the first forming drum,
• a second forming drum having an outer surface configured for receiving cellulose fibres originating from the dispenser and from the outer surface of the first forming drum and for forming the continuous or discontinuous cellulose blank, by means of a second air removing device arranged inside the second forming drum, and
• a support structure for receiving the continuous or discontinuous cellulose blank formed on said second forming drum.