Method for cleaning a web

A method for cleaning a web by a dust removing device, comprising the steps of:

• directing a first dust separating blowing at a first of the web to separate dust and other particles from the web,
• applying suction to the first side of the web to remove the dust and particles separated from the web at a location proximate to and before the first dust separating blowing in a running direction of the web,
• directing a second dust separating blowing at a second side of the web opposite the first side of the web to separate dust and other particles from the web, the second dust separating blowing being directed at a location in opposed relationship to a location at which suction is applied to the first side of the web,
• applying suction to the second side of the web to remove the dust and other particles separated from the web, the suction being applied to the second side of the web at a location in opposed relationship to a location at which the first dust separating blowing is directed at the first side of the web, and
• generating a vortex flow on the first side of the web at a location before the first dust separating blowing is directed at the first side of the web such that carrying of the dust and particles along with the web into a surrounding environment is reduced and the effect of the suction on the runnability of the web is compensated for.