A perfect match between the CleanLine Extract4D cleaning system and CleanWeave dryer fabric provides unrivalled results, including an extra day of production for Progroup.
Traditional dryer fabric cleaning systems cannot keep pace with changes in the industry. The deteriorating quality of recycled fiber creates a challenge for stock preparation, and it also has a detrimental effect in the dryer section. Most notably, it leads to severe contamination on dryer fabrics. In the past, there was only one adjustment to improve cleaning: more water pressure. Enter the CleanLine Extract4D innovation from Voith.
“Other systems on the market clean in only one direction,” explains Manfred Rosenbach, Product Manager at Voith. “CleanLine Extract4D uses four directions of water jets in direct contact with the entire surface and more internal structure of the fabric.” Since the largest release of energy is at the point when water first contacts the fabric, the CleanLine Extract4D maximizes cleaning – to the power of four.
For Progroup, installing the CleanLine Extract4D on its machine in Eisenhüttenstadt ended a long struggle with severe dryer section contamination. After replacing the traditional cleaning system with CleanLine Extract4D on the critical first and second dryer groups, the improvement in clean running was both immediate and dramatic.
With traditional cleaning systems, more contamination forces an increase in water jet pressure. However, this higher pressure increases the risk of fibrillation damage to the fabric and an unplanned fabric change. In contrast, cleaning in more directions allows a lower pressure, confirms Rosenbach: “For Progroup, we use 10% lower cleaning pressure and achieve significantly better cleaning results than with the old system.”
Another issue for the machine, which produces low basis weight packaging papers, was residual cleaning water within the dryer fabric, causing wet streaks in the paper. This was considerably reduced with CleanLine Extract4D thanks to another unique feature of the system: a long V-shaped air knife after the extraction zone. For Progroup, the air knife was adapted with more air nozzles to ensure optimal drying of the fabric. The results convinced the customer to include this step change in cleaning technology on 11 dryer groups of its new PM 3 in Sandersdorf-Brehna, Germany.
A clean match
For Progroup, the results were more dramatic, because the CleanLine Extract4D was used together with Voith’s CleanWeave dryer fabric. Compared to other fabrics on the market, its fabric structure has the lowest internal trapped volume and a minimum number of crossover points to reduce the adhesion of contamination. Special flex points loosen contamination for easier cleaning. The larger, straight-through apertures of CleanWeave more easily transmit vacuum for sheet control and airflows for drying.
The Voith cleaning and fabric technologists worked closely with Progroup’s project team to achieve the most effective and reliable solution. It is a result that cannot be replicated with other cleaning systems and dryer fabric designs on the market. The synergies provided with CleanWeave and CleanLine Extract4D are simply unique.
The best solution
CleanLine Extract4D and CleanWeave are part of the Voith DryMax solution. DryMax combines innovative products with proven advantages to reduce contamination and improve runability in the dryer section.
● Improved runability and productivity
● Lower cleaning pressure
● Better fabric performance
● Optimal changes of fabrics at scheduled shutdowns
● Higher quality paper