Pulp Paper & Logistics
INDUSTRY NEWS
HEIMBACH 15
Phot0 1 and photo 2: Contamination and deposits are not uncommon in the forming sections of paper machines
of forming fabrics, rolls, and doctors. Of course, it must be said that
contaminated edges or a sub- optimum and unsuitable forming fabric design can also cause these problems. When producing paper which is changed by further processing into artistically accomplished brochures by advertising agencies, for example, cleanliness is a top priority.
Happy customers In the final count, the result of papermakers’ daily successes is:
paper of the highest quality, made in the most efficient way possible, and available at short notice. In total, quite simply high customer satisfaction. “Quality always wins out,” as customers say, whilst, after all: “Art requires skill”. Indeed, mastering the art of papermaking is ‘only’ half the battle as machine clothing has to do the rest in harmony with the machine.
Persuasive figures It is not difficult to work out what happens when production has to be interrupted. The loss of annual
sales is more than €1.8 million with just one single sheet break per day (board machine: test liner, 100g/sqm, 7m-wide, 1,000 m/min), which is a considerable amount. Since Heimbach has seen time after time on our various assignments that fibre or slime deposits can be the cause of breaks – especially in the forming section – its belief is that these should never be ignored.
Conditioning is a significant factor Conditioning is also a critical factor. If this does not meet the requirements of the process, the result will be poor. High water
quality, the correct filtration units, precise water pressure and perfectly adjusted nozzles – this is the way to achieve optimum production in the forming section. In photos 4 and 5 the difference between a turbulent jet (photos 4) and the correct laminar alternative is clearly visible. When a water jet is turbulent the predominant cause is defective nozzles and they should be replaced – because efficient cleaning can only be achieved with the correct jet. In order for the laminar jet to be able to clean effectively, the nozzles should be adjusted to an angle of between 70 and 100 degrees towards the
Photo 3: Fine particles near the edges
Photo 4: Defective nozzles lead to turbulent water jets July/August 2017
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