Voith Sulzer Papiertechnik Patent Gmbh

Horst Wiese

Martin Kemper

Process and apparatus for removing fine impurities from a fibrous suspension. The process and apparatus each provide for conveying the fibrous suspension to at least one sorting device, separating the fibrous suspension using the at least one sorting device into an accepts portion and a rejects portion, finishing at least some of the accepts portion leaving the at least one sorting device using a finishing device, separating at least some portion of the rejects portion leaving the at least one sorting device using at least one last sorting device into an accepts portion and an rejects portion, separating at least some portion of the accepts portion leaving the at least one last sorting device into an accepts portion and a rejects portion using a flotation device, and finishing at least some portion of the accepts portion leaving the flotation device using the finishing device.

Apparatus and process for removing fine impurities from a fibrous suspension

Apparatus for removing fine impurities from a fibrous suspension comprises a dissolution device, a pre-purification device, a wet straining device, and at least one flotation device. The wet straining device comprises at least two sorting devices present in sequence, each sorting device having a wire for separating the fibrous suspension into an &ldquo;accepts&rdquo; portion and a &ldquo;rejects&rdquo; portion. The flotation device is adapted to purify the &ldquo;accepts&rdquo; portion of at least one sorting device, and further separates the fibrous suspension into an &ldquo;accepts&rdquo; portion and a &ldquo;rejects&rdquo; portion. The process for removing fine impurities from a fibrous suspension comprises the steps of subjecting the fibrous suspension to a dissolution process, subjecting the fibrous suspension to a pre-purification process, purifying the fibrous suspension in a wet straining process, and purifying &ldquo;accepts&rdquo; portions from the wet straining process by a flotation process.

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Schongau, Germany

Horst Wiese