Method and apparatus for dry manufacturing rigid cellulose products

A method for dry manufacturing rigid cellulose products having essentially non-flat general shape from cellulose fibres, the method comprising the steps of:

• providing a quantity of separated cellulose fibres from a dry cellulose raw material in at least one separating unit,
• providing the separated cellulose fibres onto a support structure for forming a cellulose blank,
• producing a rigid cellulose product having essentially non-flat general shape by pressing the cellulose blank in a product forming unit having a moulding tool for forming the rigid cellulose product, and
• prior to the step of producing the rigid cellulose product having essentially non-flat general shape, imprinting the cellulose blank by providing an imprinted pattern onto the cellulose blank by means of at least one imprinting tool, the imprinted pattern defined by partially compressed/imprinted locations and locations not partially compressed/imprinted, the imprinted pattern operative to increase internal bonding between individual cellulose fibres at each partially compressed/imprinted location relative to the locations not partially compressed/imprinted to prevent mutual separation of the individual cellulose fibres during the pressing of the cellulose blank in the product forming unit.