To deal with the watermark formation, watermark pattern and filler clogging of various suction cylinders and suction rolls to be used for a wire part, a press part, etc., to readily change the constitution of each paper layer formation unit and to improve the orientation, yield and physical properties of fiber, watermark pattern, operation efficiency, etc.

An irrotational cylinder having a drain opening divided by a suction method in the interior at the central part is installed. A machine body 5 of a tapered suction roll cell rotating through a bearing is fixed to revolving shafts 3 and 4 and attached to the outer periphery of the cylinder. A tapered suction roll sleeve 6 with an inner peripheral face having the same gradient as the outer periphery of the tapered suction roll cell machine body 5 and with an outer peripheral face having a cylindrical outer periphery of an arbitrary diameter is relatively inserted into the outer periphery of the tapered suction roll machine body to give a suction net or a suction roll capable of freely inserting and removing suction rolls of various diameters, by which the optimum paper layer formation is carried out under various paper making conditions.