Abstract: In the paper coating operation a wet or dry edge from coating composition is formed on the, seen in the direction of movement of the paper web, downstream side of the doctor, the so-called stalagmite formation. This stalagmite formation leads to various problems in the papermaking process and especially occurs at high speeds of the paper web and/or a high solids content of the coating composition, which two operating conditions are exactly required to obtain a maximum paper yield and a high paper quality. According to the invention the stalagmite formation is effectively prevented by supplying a fluid inhibiting the stalagmite formation to an area bounded, on the one hand, by the paper web and, on the other hand, by the above side of the doctor blade.

Abstract: A splicing tape (100) includes a splicing portion (1, 2) and an attachment portion (10", 41), the attachment portion (10", 41) being provided for releasably and self-supportively attaching the splicing tape (100) substantially across the width of a roll of sheet material. A first adhesive layer (2) is provided to attach the leading edge of the roll to the splicing tape (100). The attachment portion (10", 41) is adapted to release the leading edge and splicing portion (1, 2) from the underlying sheet material leaving a non-tacky first surface of the underlying sheet material. A butt or overlap splice can be completed by attaching a further sheet material to the splicing portion (1, 2). The attachment portion (10", 41) includes preferably portions (10") for separating the attachment portion from the splicing portion (1, 2) and/or portions (41) for detaching the attachment portion from the surface of the underlying layer. Methods of making permanent or flying splices are provided.

Abstract: In the paper coating operation a wet or dry edge from coating composition is formed on the, seen in the direction of movement of the paper web, downstream side of the doctor, the so-called stalagmite formation. This stalagmite formation leads to various problems in the papermaking process and especially occurs at high speeds of the paper web and/or a high solids content of the coating composition, which two operating conditions are exactly required to obtain a maximum paper yield and a high paper quality. According to the invention the stalagmite formation is effectively prevented by supplying a fluid inhibiting the stalagmite formation to an area bounded, on the one hand, by the paper web and, on the other hand, by the above side of the doctor blade.

Abstract: A process for purifying waste water resulting from the manufacture of chemo- and/or thermomechanical pulp, which comprises subjecting the waste water to at least the following sequence of steps:sedimentation of coarser constituents (4);cooling (6);detoxification (7);anaerobic hydrolysis and preacidification (10) with addition of nutrient salts and readjustment of the redox potential;production of methane in a methane reactor (11);aerobic purification and separation of biologic sludge (12; 13), which is at least partly recycled to the detoxification step (7), in which process aerobic sludge is separated prior to the anaerobic hydrolysis step (10).