Valmet Oy

Pekka Mauranen

Timo Vedenpaa

A method and apparatus for cutting a lead-in strip from a paper web in a multiple cylinder dryer section of a paper machine and for increasing the width of the lead-in strip by a so-called oblique draw. A cutting device for cutting the web is situated alongside a region of an unsupported draw of the web in the dryer section. According to the method, and apparatus a guide surface which extends in substantially parallel relationship to the plane of the web is associated with the web cutting device. A gas flow is directed over the guide surface to stabilize the run of the web during the cutting operation performed on the web by the cutting device. The gas flow is directed onto the guide surface from a nozzle opening situated adjacent to the leading edge region of the guide surface into a space between the guide surface and the web to produce an underpressure in the space which stabilizes the web run. Alternatively, two gas flows are directed from respective leading and trailing edge regions of the guide surface toward each other onto the guide surface into the space between the web and the guide surface to stabilize the web by means of an overpressure created in the space.

Method for cutting a lead-in strip from a paper web in a paper machine

A method and apparatus for cutting a lead-in strip from a paper web in a multiple cylinder dryer section of a paper machine and for increasing the width of the lead-in strip by a so-called oblique draw. A cutting device for cutting the web is situated alongside a region of an unsupported draw of the web in the dryer section. According to the method and apparatus, a guide surface which extends in substantially parallel relationship to the plane of the web is associated with the web cutting device. A gas flow is directed over the guide surface to stabilize the run of the web during the cutting operation performed on the web by the cutting device. The gas flow is directed onto the guide surface from a nozzle opening situated adjacent to the leading edge region of the guide surface into a space between the guide surface and the web to produce an underpressure in the space which stabilizes the web run. Alternatively, two gas flows are directed from respective leading and trailing edge regions of the guide surface toward each other onto the guide surface into the space between the web and the guide surface to stabilize the web by means of an overpressure created in the space.

Apparatus for cutting a lead-in strip from a paper web in a paper machine

Coating apparatus includes three coating rollers, in a closed group, forming two coating nips with each other. First coating supply apparatus is provided on the first coating roller, followed by knife or doctor coating apparatus. Second coating supply apparatus is provided on the second roller after the first nip, followed by knife or doctor coating apparatus. After the second roller, the paper web runs through a second nip formed by the second roller and a third coating roller. The coated web is released from the third coating roller and transferred to drying apparatus, for example. If necessary, heating apparatus is provided at the first and second coating rollers for drying the web and the coating agents by heat radiation without contact with the web.

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Jyvaskyla, Finland

Pekka Mauranen