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We offer non-contact drying solutions to the Paper & Board Industry for various applications:
Non-contact drying after coating stations
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Bekaert offers gas and electrical solutions for non-contact drying after coating stations. A typical drying arch consists of a GemDryer® or a WebMate® directly after the coating station to reach the coat gel point as quickly as possible, to avoid binder migration. Binder migration induces paper quality problems (eg.mottling). Binder migration increases also the cost of operations while the cost of binder is relatively high compared to the energy cost of infrared drying. Another advantage to have a high drying rate at the beginning of the drying arch is that the faster the evaporation occurs, the less water and binder will migrate into the base sheet. This free water is easier to remove than bound water, which is inside the fibres. |
| The second part of the drying arch should have a lower evaporation rate until the second critical concentration is reached. The last part of the drying arch should preferably have a high drying rate again after the second critical concentration point in order to lengthen relaxation time. At this stage, it is extremely important not to overheat the surface of the paper as the quality could be adversely affected. Therefore, the best non-contact drying solution for the second and last part of the drying arch is the UniDryer®V2 . This system combines high density infrared heating, while temperature is controlled all along the drying arch by the use of flotation nozzle technology after every 2 row of Gem emitters.
Non-contact drying after Metering Size-Press
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In the last years, a large number of film presses or metering size presses (MSP) have been installed worldwide. In the beginning, most film presses were replacing conventional size presses for surface sizing of paper but today, more and more film presses are installed for pigmenting or even coating with coat weights up to 10g/m2 per side. As the web tension at this point is low, speeds are high, quality of drying is important and space is limited, the technical demand for non-contact drying after MSP is very high.
For this application, Bekaert already introduced the second generation of UniDryer non-contact drying systems, the UniDryer® V2. |
This technology combines the advantages of high power density infrared drying together with the benefits of traditional flotation airdrying. As the major part of the MSP projects are rebuilts, the extreme compactness (in the machine and on the mezzanines) of the UniDryer® V2 becomes a major advantage to the papermaker. This allows to position the system in the best possible way into the machine to ensure the best webrun. Runnability is guaranteed as well to be optimal by the sine-wave flotation of the UniDryer® V2. Unlike conventional flotation dryers, this sytem allows to integrate a moisture profiling option to foster even coating pick-up. Energy costs can make up a remarkable share of the total production costs at paper mills. The latest version of UniDryer® V2 offers the highest efficiency for non-contact drying due to the combination of infrared and high temperature high speed flotation air technology.
Whenever gas is not available on site a WebMate® can be proposed for this application.
CD Moisture Profiling
 Improving the moisture profile of paper or board leads to higher quality products for our customers.
The DryMate Profiling simulation programme allows to define the best moisture profiling system and position on your machine.
Depending on the cost of energy and your current moisture profile, we can offer you a gas profiling option on a GemDryer® or a UniDryer® V2 , or an electrical profiling solution by a WebMate® M2000 or P2200.
Also, combinations of our gas and electrical profiling products are offered for the best 2 sigma performance. Gas profiling on GemDryer® or UniDryer® V2 is used for coarse moisture profiling whereas WebMate® M2000 or P2200 electrical systems are used for narrow moisture profiling.
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