Valmet Corporation

Valmet Aktiebolag

Massimiliano Candutti

Per-Olof Malmqvist

Tomas Carlsson

Klavdij Lasic

Marco Russian

The invention relates to a dust-handling device () for collecting and handling dust in a paper-making environment wherein the dust-handling device () comprises a source of underpressure () and an elongated collector () that extends along a longitudinal axis. The elongated collector () is connected to the source of underpressure () such that underpressure can be generated inside the elongated collector () and the elongated collector () has an inlet () through which dust-laden air can enter the elongated collector () and an exit opening () through which dust-laden air can be evacuated from the elongated collector. The inlet () of the elongated collector () is disposed in such a relation to the longitudinal axis of the elongated collector () so that upon drawing the dust-laden air into the elongated collector (), an air vortex is induced with the dust-laden air wherein the induced air vortex flows between the collector inlet () and the collector exit opening (). A source of water () is connected to the elongated collector such that water can be introduced into elongated collector () so that dust of the dust-laden air can be exposed to and mix with the water introduced into the elongated collector (). According to the invention, a dust removal device () is mounted on the elongated collector and arranged to act against the inlet () to remove dust that has clogged the inlet (). The invention also relates to a method in which dust clogging the inlet () is removed.

Dust-handling device for collecting and handling dust in a paper-making environment

The invention relates to a system () and a method for collecting and handling dust in a paper-making environment. The system () comprises a source of underpressure () and an elongated collector () that extends along a longitudinal axis and which elongated collector () is connected to the source of underpressure () through at least one suction duct () such that underpressure can be generated inside the elongated collector (). The elongated collector () has an inlet () through which dust-laden air can enter the elongated collector () and an exit opening () leading to the suction duct () through which exit opening () dust-laden air can be evacuated from the elongated collector (). A source of water () is connected by at least one water supply duct () to the elongated collector () such that water from the source of water () can be introduced into the elongated collector so that dust in the dust-laden air can be exposed to and mix with the water introduced into the elongated collector (). A flow meter () is functionally connected to the system () to measure at least one of a flow of water from the source of water () to the elongated collector () or a flow of water exiting from the elongated collector () through the exit opening () of the elongated collector () and arranged to send a signal indicating a numerical value for a flow of water that reaches or leaves the elongated collector () such that this value can be compared to a predetermined minimum value. The system is used to carry out the inventive method.

System and a method for collecting and handling dust in a paper-making environment

The invention relates to an apparatus for winding a paper web. It comprises a rotatably mounted reel spool () onto which paper can be wound and an endless flexible belt () which is permeable to air and supported by support rolls (). The flexible belt is positioned adjacent the reel spool () to engage the web against the reel spool during winding such that the endless flexible belt is deflected from the path of travel. The flexible belt has a web-contacting side (). An actuator () is arranged to position the reel spool () and the flexible belt relative to each other to vary the amount of deflection. The apparatus further comprises a cleaning device () with at least one nozzle for blowing air against the web-contacting side of the flexible belt at a point where the flexible belt is not in contact with the paper. The invention also relates to a method of removing dust particles.

Apparatus for winding a web of paper material and a method of removing dust

The invention relates to a reel-up () for receiving and winding into a roll () a paper web (W) that arrives from a drying cylinder () in a paper making machine. The reel-up () comprises a rotatably mounted reel spool () onto which a paper web (W) can be wound to create a paper roll () of increasing diameter and an endless flexible belt () mounted for rotation along a predetermined path of travel such that the flexible belt () forms a loop. The flexible belt () is positioned adjacent to the reel spool () to engage the paper web (W) against the reel spool () during winding such that the flexible belt () is deflected from the predetermined path of travel when the paper roll () starts to build up on the reel spool (). The flexible belt () is air permeable and at least one blow box () is arranged inside the loop of the flexible belt () such that an underpressure can be generated that draws the paper web (W) against the flexible belt (). The at least one blow box () has at least one nozzle () through which air is blown out of the at least one blow box () and the nozzle is shaped as a slot. According to the invention, the at least one blow () box faces the flexible belt () with an outer surface () which is convexly curved such that dust which has been sucked through the flexible belt () and lands on the at least one blow box () is helped by gravity to glide along the outer surface () of the blow box () and fall of the blow box ().

Reel-up for receiving and winding into a roll a paper web that arrives from a drying cylinder in a paper making machine and a paper making machine using a reel-up

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Gorizia, Italy

Massimiliano Candutti