Method and apparatus for dry manufacturing rigid cellulose products

method for dry manufacturing rigid cellulose products having non-flat general shape and an internal cavity, the method comprising the steps of:

• providing an air-laid first cellulose blank segment, wherein the first cellulose blank segment comprises at least one product area and a rim area located adjacent and at least partly surrounding said at least one product area,
• pressing the at least one product area of the first cellulose blank segment into a final rigid non-flat shape by applying a predetermined first pressure P1;
• keeping the rim area of the first cellulose blank segment in a non-final non-rigid shape,
• providing a second cellulose blank segment wherein the second cellulose blank segment comprises at least one product area and a rim area located adjacent and at least partly surrounding the at least one product area of the second cellulose blank segment,
• pressing the at least one product area of the second cellulose blank segment into a final rigid shape by applying a predetermined second pressure P2,
• thereafter
• placing the rim area of the first cellulose blank segment in contact with the rim area of the second cellulose blank segment, and placing the at least one product area of the first cellulose blank segment in overlapping configuration with the at least one product area of the second cellulose blank segment, and
• joining together the rim area of the first cellulose blank segment and the rim area of the second cellulose blank segment into a homogenous final rigid rim by applying a predetermined rim pressure P-rim, thereby obtaining the rigid cellulose product having non-flat general shape wherein the internal cavity is delimited by the pressed product area of the first cellulose blank segment and by the pressed product area of the second cellulose blank segment