14 HEIMBACHINDUSTRY NEWS
Cleanliness and hygiene for better productivity
Heimbach’s Technical Assistance, Service and Know-how (TASK) team explain why forming section cleaning is so important. PPL reports
Pulp Paper & Logistics
Figure 1: The optimum angle for the water jet in the machine direction O
ne of the most frequently questions posed by papermakers is: How do I reduce or
even avoid sheet breaks? Quite often this involves the topic of ‘former hygiene’ which describes the cleanliness in the forming section.
Heimbach has devoted some
time to examining several forming sections in great detail so that it can highlight opportunities for increased productivity. This, of course, occurs right at the beginning of the process, since many key paper characteristics are already set in the forming section.
Bearing this in mind, paper makers must take the utmost care with cleanliness in this area.
Complex forming sections Only recently, Heimbach’s Technical Assistance, Service and Know-how (TASK) department was ordered again to delve into a papermaker’s ‘wet end’. What they discovered is shown in photos 1-3. You could say that it would not be possible to have more contamination. As is the case with almost every machine, the forming section shown has a complex and intricate construction. Impurities can therefore build up on a
Figure 2: The optimum angle for the water jet in the cross-machine direction
number of machine components, principally caused by water and fibre carrying.
Cleanliness is everything Deposits such as this are toxic for papermaking, since
in addition to a reduction in product quality, runnability problems and sheet breaks are often the result. As experience with customers around the world has shown, this is mainly due to inadequate cleaning
Figure 3: Open structure of the Primoselect forming fabric July/August 2017
Figure 4: The low void volume of Primoselect reduces water and fibre carrying
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