Abstract: The invention relates to an apparatus and method for cutting a material web in a papermaking machine. The apparatus includes a cutting device, an upper holding device and an upper positioning device. The cutting device is fixed above the upper positioning device on the upper holding device such that it can be moved in the cross-machine direction. The apparatus additionally has an air guide box and the air guide box is fixed above the material web, likewise on the upper holding device. Furthermore, the apparatus has a cutting table fixed to a lower holding device via a first and/or a second lower positioning device. The cutting table is movable substantially vertically with respect to the material web via the first lower positioning device and/or movable in the cross-machine direction via the second lower positioning device.

Abstract: The invention relates to an apparatus and method for cutting a material web in a papermaking machine, comprising a cutting device, an upper holding device and an upper positioning device, the cutting device being fixed above the upper positioning device on the upper holding device such that it can be moved in the cross-machine direction, the apparatus additionally having an air guide box and the air guide box being fixed above the material web, likewise on the upper holding device. Furthermore, the apparatus has a cutting table fixed to a lower holding device via a first and/or a second lower positioning device, the cutting table being movable substantially vertically with respect to the material web via the first lower positioning device and/or movable in the cross-machine direction via the second lower positioning device.

Abstract: The invention relates to an apparatus and method for cutting a material web in a papermaking machine. The apparatus includes a cutting device, an upper holding device and an upper positioning device, the cutting device being fixed above the upper positioning device on the upper holding device such that it can be moved in the cross-machine direction. The apparatus additionally includes an air guide box that is fixed above the material web, likewise on the upper holding device.

Abstract: The invention relates to an apparatus and method for cutting a material web in a papermaking machine, comprising a cutting device, an upper holding device and an upper positioning device, the cutting device being fixed above the upper positioning device on the upper holding device such that it can be moved in the cross-machine direction, and the apparatus additionally having an air guide box and the air guide box being fixed above the material web, likewise on the upper holding device.

Abstract: A movable water jet edge trimmer has an integral trim chute attached to a cutting support plate for the trimmer. The support plate has a cutting aperture and a series of suction apertures located inboard of the outside edge of the travelling web for supporting the web against the support plate as a water jet passes out through the cutting aperture away from the support plate and through the web. The support plate has a curved surface located downstream and outboard of the cutting aperture which curves into a trim chute opening of a trim chute. Negative pressure is applied from the trim chute to the trim chute opening to draw any strip of material cut from the edge of the web over the curved surface and into the trim chute.

Abstract: A water jet web slitting apparatus slits a web at a plurality of locations across the web into webs of smaller width in a winder. The water jet web slitting apparatus utilizes a water jet cutter to slit the web. The water jet cutter has a support plate with a pattern of suction apertures located surrounding the cutting aperture of the water jet cutter through which negative pressure is applied to hold the web against the support plate adjacent the water jet cutting apparatus and to prevent the web from fluttering or moving relative to the support plate notwithstanding whether the web is travelling or temporarily at a stopped position. This permits for the water jet to be run continuously without having to be turned off and restarted when the web travel is temporarily stopped and started again because the continually running jet does not re-wet the surface of the web or the edges cut into the web.

Abstract: A movable water jet edge trimmer has an integral trim chute attached to a cutting support plate for the trimmer. The support plate has a cutting aperture and a series of suction apertures located inboard of the outside edge of the travelling web for supporting the web against the support plate as a water jet passes out through the cutting aperture away from the support plate and through the web. The support plate has a curved surface located downstream and outboard of the cutting aperture which curves into a trim chute opening of a trim chute. Negative pressure is applied from the trim chute to the trim chute opening to draw any strip of material cut from the edge of the web over the curved surface and into the trim chute.

Abstract: A water jet cutting apparatus for use in a papermaking machine has an elongated support beam that extends across the width of the web. The water jet cutting apparatus utilizes a free spinning hose wheel about which the water jet hose supplying water to a water jet nozzle is guided and stretched. The wheel is mounted for movement with a slower moving carriage along the beam adjacent a faster moving carriage carrying the water jet nozzle. The slower moving carriage moves along the beam at speeds which are one half the speeds at which the faster moving carriage moves across the beam. During this movement of the second slower moving carriage, the wheel reels the hose thereabout to provide a travelling intermediate support for the hose. The hose wheel supports the weight of the hose and maintains it in alignment with the faster moving carriage so that less strain and stress is placed on the hose and the ends of the hose connected to the water jet nozzle during movement of the water jet nozzle across the beam.

Abstract: An apparatus for cutting a tail in a web sheet traveling through a nip between the queen roll and king roll of a calender includes a waterjet positioned adjacent the edge of the web upstream from the nip for directing a jet of water towards the web and the queen roll. The waterjet cuts a tip or leader and creates a tail that continues to travel with the remainder of the web sheet towards and through the nip. The waterjet penetrates the web and splashes against the queen roll such that the wetted portion of the queen roll compresses against the leader of the tail to carry or pull the tail around the queen roll. A doctor blade is mounted in engagement with the queen roll in line with the tail to direct the tail away from the queen roll and towards the next section of the papermaking machine. Guide trays positioned downstream of the doctor blade guide the tail to the next section of the papermaking machine. The doctor blade can be mounted stationary against the queen roll.

Abstract: A waterjet cutting head for cutting a moving sheet has a base plate and a cover plate positioned over the base plate. The cover plate includes an upper support surface for supporting the sheet and has depending chamfered sidewalls extending downwardly to the base plate to define a chamber. The upper support surface includes two matrix arrays of circular shaped suction apertures through which air is drawn by a fluid motor to draw the sheet into flat engagement with and over the upper support surface. A waterjet emitting aperture is located in the upper support surface between an upstream suction aperture and a downstream suction aperture in a first general direction relative to sheet travel. A waterjet nozzle is positioned in the chamber below the waterjet emitting aperture for directing a waterjet through this aperture to cut through the sheet. The upstream aperture is positioned partially offset in a direction orthogonal to the first general direction relative to the downstream suction aperture.

Abstract: A water jet edge trimming station for trimming the edges of coated paper during on-machine operation includes backsplash compensating features. The edge trimming station has a cutting station over which the web travels to be cut. The water jet travels along a water jet axis to a point of impingement at the cutting station to cut the web. The cutting station has an effluent receiving aperture at the point of impingement. A negative pressure mixing zone located below the aperture draws effluent by-products or backsplash associated with cutting of the web below the cutting surface of the web. The water jet axis is offset a first predetermined angle chosen relative to a normal axis passing at right angles through the point of impingement to reduce backsplash. The water axis jet is rotated about the normal axis by a second predetermined angle to direct the effluent by-products away from the water jet nozzle and the traveling web.