Long tube parts producer in Ireland gains excellent cleaning and degreasing results with their new modern hermetically sealed cleaning system from Hockh.
To meet stringent cleaning demands required for the production of tube components used in Aerospace, Electronics, Engineering, Nuclear, Instrumentation and Medical Industries a consistent high quality result is required supported by good technology.
When an Ireland based manufacturer of specialist tubes decided to source a replacement cleaning process for its existing Trichloroethylene open degreasing unit, it set out to entirely to replace the whole system. This represented a special challenge because they had decades of success using a hand lance and solvent vapour to remove different oils and lubricants. The company embarked on a broad evaluation and series of trials in a sealed system in a Höckh vacuum cleaning system.
The outstanding range of mechanical possibilities of Höckh equipment added a new dimension to the cleaning process. Oil compatibility tests defined optimum conditions with CONTINUOUS operation of the EQUIPMENT.
The significant benefits they gained from this new system include improved health and safety, SER compliance, a more consistent primary cleaning regime and consistent quality. They achieved these results without compromising on the throughput of the parts.
With the new system the parts are held in a perforated basket size of 6000x480x300mm and the basket is placed in the vacuum-proofed chamber. The transparent glass door is closed with a knee lever lock mechanism, which is an added safety measure in case of any power failures. Once the chamber is completely under vacuum and the seal has been checked, the process begins with a spray pre-wash from tank one circulating in a circuit through the chip filters with the basket rotating or swivelling, capturing most of the contaminants with the first stage using only a small amount of solvent. After
spraying the solvent is pumped directly from the cleaning chamber for recycling ready for the next load.
The chamber is then surged with solvent until fully immersed to allow the parts to be cleaned thoroughly with the support of ultrasonics. The solvent is then drained back into its respective tanks through the filters to keep the solvent free from particles with highly efficient topline filters in the last tanks.
With the double-grouped filters allowing for the automatic switch over to permit filter change over or maintenance without stopping production thus keeping the machine running 24/7.
Pure solvent vapour which is generated in a unique Höckh patented distilling system is directed into the working chamber where it condenses on the cold parts achieving a lasting finish.
With the vacuum Running at up to eight loads per hour, depending on the wash program, the Multi clean system has allowed Presspart the flexibility to degrease and clean a cocktail of contaminants from a mix of 120 different types of parts with 30 types of geometries and up to 15 different materials with a series of filtered circuits coupled with a more efficient combination of spray, rotation, immersion and ultrasonic capacity. The last tank allows for anti rust protection for certain products.
The vacuum drying process starts by lowering the pressure in the process chamber to aid the evaporation of solvent from the parts then the chamber is vented again to the ambient pressure. A Double regenerating carbon absorption system removes the last traces of solvent from the chamber prior to finishing of the cleaning cycle. For adherence to the legal regulations, the system is equipped with a concentration measuring instrument, which monitors the solvent concentration in the working chamber at regular
Höckh brings an untouchable reputation for supplying high quality degreasing plants throughout the world for companies that value automation, high grade cleaning, sparing solvent distillation and reduced energy costs.
Only with a Höckh system is it possible to achieve such low solvent use due to the ability to distillate Perchlorethyelne with a highly efficient double distillation process of which Prespaart has benefited greatly.
The Höckh range, which features stainless steel construction allied to very high quality welding procedures, also includes fluid management facilities that can be interconnected with the SAFE-TAINER™ system provided by SAFECHEM, a subsidiary of The Dow Chemical Company.
All images are under copyright © Laurent Nivalle