4 British Paper Machinery News
Model AG chooses Compact Engineering
Compact’s Corona dryers help improve quality at Model AG
Profiling tubes fibre blocking solved
Modifications designed by Poole Projects have solved profiling tubes fibre blocking problem
dryers for its No.1 paper machine at Weinfelden in Switzerland, used to make fluting and test liner grades of between 90- 120g/m2
M . The machine has a
2500mm wide deckle and, as is often the case on a narrow machine, the sheet is made slightly wider than the effective drying width of the paper machine. Whilst this can commonly cause wet edges that might present as problems in reel building, in this case it was identified that the wet edges were a cause of baggy edges. A baggy edge occurs when the edges of the sheet dry and therefore shrink at a different point in the machine direction to the main part of the sheet. Baggy edges cause a lack of stiffness in the edges of the sheet resulting in variable product quality when the sheet is converted.
At Model AG quality is of the utmost importance, as the company converts much of its own product on site, so it turned to Compact Engineering for a suitable solution. Compact identified the optimal machine direction location that would encourage even shrinkage across the full sheet width if the edges were suitably dry. To bring the edge moisture
Cont@ct the BPMSA
odel AG has chosen Compact Engineering Ltd to supply edge
down to the sheet average, two Corona dryers will be installed on both sides of the machine before the size press. Each dryer will be controlled through four 37.5mm wide control zones to deliver the best possible results while minimising energy consumption. Energy efficiency is very important to Model AG, a signatory to the Swiss Private Sector Energy Agency voluntary climate protection and energy efficiency certification programme.
Each of the control zones in each Corona dryer head will have a maximum capacity of 12kW, so 24kW per control zone across the sheet in total that will be applied normal (90°) to the sheet surface to maximise absorption as the sheet travels over the drying cylinders. The Corona dryer is curved in the machine direction to allow the maximum application of infrared for the longest period of time in a limited amount of space. The wavelength of the infrared is optimised for absorption by the cellulose fibre in the sheet and the infrared is generated by lamps that Compact makes in-house. Due to the care and attention that the team at Compact display when making the lamps they are guaranteed for 15,000 hours. The infrared is directed towards the sheet using gold-plated reflectors and the lamps and reflectors are protected by Compact’s own QPT system that
T: +44 (0)1438 832742
oole Projects Ltd has recently been engaged to provide a solution to a problem a customer was having with the headbox dilution profiling tubes blocking with fibre. The company initially carried out a machine audit to find possible causes for these blockages. An issue was identified of a build-up of fibre in the silo which was being carried over into the headbox dilution pipe and causing the blockages. In the existing system the machine silo provided water for the headbox dilution supply and also the headbox stock feed. The thick stock was injected at the tank outlet for the machine fan pump to the headbox. It was discovered that on a machine outage, when the fan
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allows free passage to the infrared while directing the cooling air flow through the dryers.
The cooling air that is warmed as it travels through the emitters is impinged onto the sheet surface to displace the boundary layer and promote rapid evaporation. The dryers cool to touch within two seconds of switching off the power making them safe to use on all grades of papers and boards. The new dryers will be installed during a machine shut in the second week of May 2023.
Compact Engineering Ltd Tim Klemz
+44(0)1845 525356 +44(0)1845 525357
tim.klemz@compact.co.uk www.compact.co.uk
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info@bpmsa.co.uk
pump was stopped, the thick stock line would drain into the silo, therefore putting fibre into the dilution water. Poole Projects solution was to modify the thick stock feed line so that the thick stock was injected directly into the fan pump suction, using the pump to do the mixing. These small modifications have solved the issue. The customer is no longer having an issue with blocked dilution tubes and is also seeing improved stock mixing.
Poole Projects Ltd Paul Stoney
+44(0)161 724 7692 +44(0)161 724 6544
pstoney@pooleprojects.co.uk www.pooleprojects.co.uk
Vibration sensors installed to remotely monitor bearing health
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hen a client reported a possible bearing failure in a critical large process fan,
Salvtech Ltd was called to investigate, give advice and plan and execute a possible repair. Salvtech used a Phantom system from CBM partners to attach remote sensors to the bearings, connected via Bluetooth to a 4G unit sending data to the Cloud. Using this data remotely, it was found that a serious failure was taking place which would need a shutdown of approximately a
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