Knoll Maschinenbau GmbG

Archiv for: Pulp and Paper Industry

KNOLL’s MX does not heat up even at 140 °C

The MX progressing cavity pump from KNOLL is used in many different areas, from the food and beverage industry to pharmaceuticals to the chemical industry. This pump also stands the test in extreme cases. This has been proven at Europe’s leading manufacturer of building shells, interior fittings, and insulation technology. Here, the MX is incorporated into the process of reclaiming fibrous plasterboard. It withstands temperatures of 140 ° C and an extremely abrasive fluid.

Progressing cavity pump MXWaste and remains of the plasterboard panels are relegated to a viscous suspension of approx. 500 mPas. Using the MX, this fluid is pumped back into a reactor before it is processed into new fibrous plasterboard. A challenge of this use is the high temperature of the fluid, 140 °C. Thanks to its special design, the MX performs well: the EvenWall® technology of the KNOLL stator guarantees even pressing even at high temperatures. This improves the durability of the stator considerably. Another challenge of the fluid is its abrasive character. The plaster suspension contains 10 – 15 µm particles with a concentration of 32 – 50 %. The MX also has the solution for this: a stator of wear-proof special elastomer for high temperatures as well as a specially-coated rotor, which also demonstrates wear-proof qualities despite the extremely abrasive fluid.

An additional benefit of the KNOLL MX progressing cavity pump is the even flow speed in the suction housing, which prevents sedimentation and thus the settling of the fluid. This is the result of the even diameter of the cardan joint and the pump’s design, which keeps the clearance volume low. Therefore, no fluid accumulations form on the joint or on the housing wall.

Rotary piston pumps were used for this process in the past, however without any success. After just a few weeks, the pumps had to be replaced due to wear. The MX progressing cavity pump from KNOLL has been used for six months already and shows no traces of wear.

Pumps for the Pulp & Paper Industry

Paper doesn’t blush tells us the proverb. Its manufacturing process is thus not meant, as the production of many thousand sorts of paper is a very demanding process. Progressing Cavity Pumps from KNOLL can here be found in different places, for example directly on the paper machine (for coating color) or in the coating kitchen (for various chemical additives).

It’s the characteristics and product features of this pump that speak for its use in the pulp and paper industry:

Low Pulsation: Absolutely smooth transportation is given and even under fluctuating medium temperatures the characteristic curve remains constant. A precise metering of media of all kinds, which can also be highly viscous or abrasive, is guaranteed.

Large capacity: Capacities with flow rates of up to 200,000 liters per hour are possible with the (so far) largest model of the MX series, the MX100.

Minimum space requirements: With its stator built in EvenWall-technology MX-pumps need only little space and can therefor be used even even under difficult conditions.

Suitable for high pressures: Both, the rotor-stator unit, as well as the very robust cardan joint can easily work under high pressure. Progressive Cavity Pumps from KNOLL are generally delivered with a bearing block, so that axial and radial forces are not transmitted to the gearbox. As a result of this the gears are fail-save protected.

In practice you will find MX-pumps from KNOLL for example in the promotion of paper pulp, mostly in its hopper version. The latter allows to pump media such as pulp, which can be of little or no more free-flowing substance.

But you will also find the MX in the coating kitchen where different chemical additives need to be precisely metered and transported. In its special chemical design the MX-pump promotes calcium carbonate, fillers of all kinds, glues, latex, starch, coating color and titanium dioxide. In addition such media may be hot as for example coating color, or highly abrasive, environmentally harmful and dangerous. Performance and reliability of the pump are not affected by this.

Another advantage of the MX-pump is its spacious sealing chamber in which various sealing arrangements can be fitted, following many different needs and circumstances. Depending on the medium KNOLL can offer double acting mechanical seals for blocking pressure (in closed systems) or as a pressureless quench for cooling or lubrication of the sealing surfaces.

Overall progressing cavity pumps from KNOLL support the pulp and paper industry in its most cost sensitive factor: the use of materials (material consumption) to produce. Fast transportation even under high pressure, exact metering and very short holding time (for maintenance) contribute to achieve a cost-optimized production of paper.