CHETRA Mechanical Seals for the Pulp and Paper Industry

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CHETRA Paper Competence

The renewable resource „wood“ is used for obtaining the basic material cellulose (pulp) for paper manufacture, in which the environmentally-friendly addition of wastepaper also plays a big part. The processing in the individual stations, such as the processing of raw materials, stock preparation plant, digestery, bleachery and paper finishing, is carried out by chemical, thermal and mechanical procedures. A substantial number of centrifugal pumps and, to a certain extent, positive-displacement pumps, agitators, refiners and sorters are engaged in this. The basic material “cellulose” as well as the chemical auxiliary agents put high demands on the seal technology of the mechanical seal used – because the media are abrasive, viscous, in part toxic and at high temperatures.

A heightened environmental awareness and appropriate stipulations such as TA-Luft (Clean Air Act), ATEX a.o., combined with economic efficiency, are the prerequisites for the planning, designing and manufacturing of every CHETRA mechanical seal.


The results are innovative and often custom-made solutions for the specific requirements of pulp and paper factories, based on decades of experience in this area, with sound application-technological experience for the optimum appropriate mechanical seal and the corresponding accessories.

The CHETRA supply program covers many high-grade standard seals as well as products custom-made for the respective application. Notable features and benefits:

  • robust construction with extensive safety reserves.

  • protection of sensitive components.

  • solid seal rings and stationary seats in self-aligning arrangement.

  • stationary design, if applicable.

  • special seal face geometry.

  • guided circulation flow for optimal heat dissipation.

  • design allowing for the high stock consistency.

  • mechanical seal design which considerably reduces the need for flushing.

  • optimization of material: application of suitable materials which are partly subjected to patented surface finish.

  • the calculated use of mechanical seal accessories including fluid flowmeter (SCU units) reduces the amount of water required.