Abstract: A method and an apparatus for making e.g. boardlike objects (11) arranged in a pile (12), in which method the objects are marked with a marking printed by a print head (26) and containing e.g. information about the object. To improve the marking quality, the objects are pressed together to reduce or eliminate gaps between them in the direction of compression, and the marking is made on an edge of the object that is parallel to the direction of compression of the objects.

Abstract: Method and system for the weighing of sheets (6) of wood material on a sheet forming line, on which line the sheets are carried on a conveyor from a sheet forming apparatus and cooled down in a cooling turn gear comprising a cooling wheel (3) provided with radial supporters (5). The sheets (6) are weighed using a weighing system (8) which has been fitted in the cooling turn gear and which weights the sheets (6) when they are turned to an upright position or at least to a nearly upright position. The invention makes it possible to leave out the conveyor weight meter from the press line, thus allowing the press line to be made shorter. The weighing accuracy is substantially better than in a conventional conveyor weight meter solution because only the sheet itself is weighed instead of weighing the relatively heavy conveyor together with the light sheets on it.

Abstract: Roll set for handling, particularly screening and spreading, different materials such as wood chips and shavings, the roll set including at least two parallel-mounted, rotatable rolls, whereby the interroll gaps are adapted to pass the material being handled and at least a number of the rolls are provided with a surface patterning. The roll set is implemented by providing at least some of the rolls of the roll set with at least one collar ring made thereto in an annular manner essentially about the entire circumference of the roll. The collar ring has an outer diameter advantageously at least as large as the outer diameter of the other surface patterning made on the roll.