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HARTER OBERFLÄCHEN- UND UMWELTTECHNIK GmbH Duplex Barrel Line Drying


The internationally operating RUAG Technology of Altdorf, Switzerland, now Impreglon Coatings AG, wanted to increase the output of their plating line in 2010. Their process lines were also interrupted at that time. Bulk material was loaded in centrifuges and dried using hot air. RUAG were no longer willing to accept the extra time and handling effort plus the quality impact of deteriorated surfaces. The customer’s requirement was to integrate drying into the existing duplex barrel line. This project was a new, major engineering challenge for HARTER. And its successful realisation was another milestone in HARTER’S development. Today, RUAG dry bulk items at cycle times of six to ten minutes as appropriate for the type of material. The plating line cycle time is 15 min. With 9.5 kW rating, the Airgenex®


dehumidification module


attached to the dryer does not only provide low energy operation but also high quality drying results.


Switzerland, is a novel development. These baskets, when subjected to vibration, induce in the load a constant movement about the barrel axis. Today, several customers plate and dry hardware inside Vibarrel®


baskets. Centrifuging has


become obsolete. This ensures gain in time, better quality and process reliability. On top of this, HARTER developed a special air routeing system which automatically adjusts to the size of the Vibarrel®


are primarily used in the Swiss clock and watch industry. The low temperature, gentle and stainless drying of highly sensitive smallest parts, such as case and electronic hardware, is an enormous process improvement for the clock and watch industry.


Trial Testing Brings Success Ruag / Impreglon duplex barrel dryer. Combined Barrel / Rack Drying


There are exceptional applications where a customer requires a combined system for barrel and rack drying. An example is AHC Oberflächentechnik of Weiterstadt, Germany. The operator’s mandatory requirement was to have effective drying in their vertically arranged duplex barrels while, at the same time, allowing optional rack drying in the drying chamber. The half-shell technology had to be cumstomized to meet this requirement. The two barrels have individual half-shells which move aside before the barrels are removed to make way for another barrel or a rack to be inserted.


Drying in the Clock and Watch Industry Drying in so-called Vibarrel®


Problems with often existing dryers tend to repeat themselves: process interruption, manual handling, unsatisfactory drying results, deterioration and rejections. HARTER’S solution approach is also always the same. Drying of bulk material with high water loads is a particularly difficult task. The parameters for successful drying must therefore be determined in HARTER’S in-house pilot plant station. The customer’s most delicate products are normally used for trial testing. This ensures that the solution found can be safely applied to the operator’s whole portfolio. Local conditions, cycle times and barrel properties are reflected in the layout and design of the new barrel drying system. “We always design a special forced air routeing system for each individual application“, says Norbert Fessler, technical sales manager of HARTER. “A lot of know-how and twenty years of dryer engineering experience is put in this effort.“


Extremely Dry Air


The dryer has always attached a so-called Airgenex®


dehumidification module


baskets. This way, dissimilar size baskets may be loaded in a single dryer without air loss incurred. Vibarrel®


baskets


providing the appropriate environmental conditions inside the drying chamber. The module supplies the extremely dry air which contributes to the success of the process. The HARTER named heat pump base condensation drying is a process capable of drying any kind of solid at low temperatures between 20 °C and 90 °C as appropriate for the specific application. For barrel drying, 75 °C maximum is used in order not to impair the life of the plastic barrels. Drying is effected by passing extremely dry and, thus, unsaturated air over the items to be dried to absorb humidity. In a downstream dehumid- ification module, the air is stripped of the humidity it carries. The humidity is condensed and the condensate drained off. Subsequently, the cooled air is reheated and recirculated. The loop is closed. This makes the drying cycle almost emission free. The dehumidification module, which controls the environmental conditions inside the dryer, is attached to the drying station. It does not matter if batch or continuous drying is used. This drying system may be adjusted to bulk, barrel or rack dryers, and to belt or chamber dryers as well. Also, products to be dried may be of any make or material.


Example of duplex barrel drier with Airgenex®


dehumidification module. Contact: baskets by STS Industrie S.A. of Yvonand, Trial testing in the HARTER pilot plant 118 SURFACE WORLD september 2013 - show issue


Harter Oberflächen- und Umwelttechnik GmbH Harbatshofen 50 D-88167 Stiefenhofen / Germany Norbert Fessler Tel: +49 8383 9223 12 Email: norbert.fessler@harter-gmbh.de www.harter-gmbh.de


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