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Kaapa O.,Heimbach GmbH and Co. KG
Professional Papermaking | Year: 2013

What are the requirements for optimal press dewatering? The paper maker and the felt supplier should jointly select a felt construction, which is based on the data obtained from dewatering measurements. Dewatering measurements show clearly the differences in the behaviour of different felt constructions. They also enable the vacuum capacity to be controlled, which can have a considerable influence on energy costs. Just as important as an optimal felt construction and control of the vacuum capacity is the trouble-free operation of the rolls and belts. As the water is removed from the paper sheet, it should also immediately be removed from the grooves and drillings in the press roll or belt. It is absolutely essential that water is prevented from flowing back into the nip. How much vacuum capacity is needed for a felt? What is the correct vacuum level? These questions are frequently asked by paper makers, felt suppliers and machine builders. Source


Leigh G.,Heimbach GmbH and Co. KG
Paper Technology | Year: 2011

Clothing costs are relatively low compared to the potential energy savings and production increases that can be achieved with modern, correctly applied forming fabric designs and materials - clearly demonstrated in the above case studies. The total PMC cost is approximately 2% of the total operating costs of a paper machine - a small number compared to the 35% required for energy expenditure! Forming fabrics have a greater effect on final properties than press and dryer fabrics but less effect on energy consumption. However, through optimization of the former elements and correct application of forming fabric designs and constituent materials significant energy related benefits are achievable. Source


Kaapa O.,Heimbach GmbH and Co. KG
Paper Technology | Year: 2012

Consistent speed increases combined with the use of lower cost, and difficult raw materials, have created for the paper making process, especially in the press section, a changed demand situation. This includes two particularly sensitive aspects of mechanical fine-running, the adjustment of the felt exit angle after the press nip and the degree of felt saturation before the nip. The higher the machine speed, the more important is the precise adjustment of the exit angle. Non-optimal adjustment can lead to sheet following after the press nip, upwards with the pick-up and the 3. The selection of batt finenesses within the combination of press felt functions substantially effects the sheet guiding, the dewatering and also the sheet surface. The pick-up felt is the most important felt in the TriNip press section. Its double function requires both a perfect and reliable sheet pick-up combined with high dewatering efficiency in the presses. Source


Kaapa O.,Heimbach GmbH and Co. KG
Paper Technology | Year: 2012

The facts covered in this article and their relationships indicate the high degree of complexity on the subject of energy: Positive answers to questions on reducing energy consumption in the press section are substantially determined by the appropriate clothing - and the possible optimisation of dewatering techniques that the clothing permits. The solution of energy saving problems through the use of press clothing stands in direct conflict with the cost pressures on the clothing manufacturer as the supplier of these solutions. This cost pressure hides the risk of a -braking- effect on new developments which are essential if further reductions in energy consumption and costs are to be achieved. Source


Leigh G.,Heimbach GmbH and Co. KG
Paper Technology | Year: 2012

The experimental material analysis has described the theory behind the successful practical experiences of Duralon, and has gone some way to explaining the mechanisms of high initial and overall power consumption in the forming section. The case study is a reflection of numerous fabric installations rather than an isolated instance and clearly demonstrates that it is possible to achieve substantial and quantifiable reductions in power consumption and associated costs through the utilisation of this innovative material. Source

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