ETL INVEST IN NEW AQUEOUS PRECISION CLEANING SYSTEM2nd Jul 2013
AQUEOUS PRECISION CLEANING…
Aqueous Cleaning is commonly used in homes for washing clothes in washing machines, washing dishes in dishwasher and body washing with geyser. Washing here means usage of water, detergent/soap, some form of scrubbing action for washing and often heat is also employed to get better washing/cleaning. Likewise, Industrial Cleaning is an extension of these kind of washing with some elements of sophistication and advanced techniques to achieve consistency of desired cleaning. Besides Cleaning Agents, Water, Heat, Agitation (scrubbing action) are employed in Industrial Washing Systems also. The selection of aqueous cleaning chemical is dependent on the ability of the chemical to dissolve and clean the soil and the selection of type of cleaning equipment is dependent on the substrate of the material and the amount of soil to be removed. Presently aqueous cleaning chemicals are available for cleaning both ferrous and non-ferrous metals to a high degree of cleaning efficiency and consistently. Selection of number of stages (single stage or multi-stages) of cleaning equipment also depends on various factors like type and amount of soil, type of equipment, substrate, heat, agitation etc.
The aqueous cleaning process is more complex than the solvent process it is replacing. For example many vapor degreasers get the wash/rinse/dry cycle in one step. However, in an aqueous based process, it may require three or more separate process steps, wash>rinse>dry, and at times two or more washing cycles and two or more rinsing cycles, besides thorough drying, to achieve the desired precision cleaning.
Washing exposes the parts to a cleaning agent to remove the soils, rinsing removes the cleaning agents from the parts and finally drying removes the water from the parts. However, Aqueous cleaning enhances cleaning efficiency, lower operating costs, greater repeatability, better process control and minimal environmental impact. Mechanical energy for aqueous cleaning is provided by three forms, scrubbing action in an immersion washing equipment by circulation of tank solution by mechanical pump and at times with dunking arrangement, spraying pressure with a Spray system or Jet spray and cavitation process with an Ultrasonic Equipment.
Immersion cleaning process, which is easy and economical over other types, means submerging of parts into the cleaning solution. Turbulation of the solution during the wash cycle dramatically increases cleaning efficiency and it is well suited to large parts with light soil with hidden surfaces that cannot be impinged upon effectively by spraying.
Spray Cleaning is very effective method an d it is generally used for parts having high soil or contaminations so that they can be exposed to spray jet washing. As the contaminants are easily exposed, they can be quickly removed by spraying pressure of the Spray Cleaning equipment. Spray cleaners can drastically reduce the cleaning time because of the jet spray.
Ultrasonic Cleaning Equipment is best suited and effective for cleaning small and intricate components with profiles, bores and crevices, as cavitations will reach all areas for cleaning action. Immersion and Spray Cleaning are also combined with Ultrasonic Cleaning Equipment for greater and precision cleaning and throughput with short cleaning cycle.
Aqueous Cleaning System generally comprises of a 3-stage namely, Wash, Rinse and Dry. Rinsing is desired in most cases, but can be done away when residue or stain mark is of no consequence, depending upon next operation of part, like painting, machining etc. Optimum results and life of aqueous cleaning solution depend upon various parameters such as contaminants, oil skimming, filtration, maintaining concentration by topping up, maintenance of the equipment including temperature maintenance etc. The life of the solution can be extended greatly by removing oil, grease etc by oil skimming and heavy particulate material by filtering (oil skimmer and filtering system will make the soil removal automatics and they are a quick fix). A cleaning bath is not to be treated as a waste pit, but as a place where soils are discarded for removal from the bath. It will extend the life of the solution, besides preventing recontamination or re-deposition of the soil.
Presently a variety of aqueous cleaning chemicals are available to clean toughest soil with high efficiency and consistency and in fact aqueous cleaning will not only meet present days toughest requirement and but also stands for the future as well as it ensures precision cleaning, all-round safety and savings. No wonder it is a preferred technology for achieving precision cleaning and to do away with toxics and solvents and associated environmental degradations and safety concerns.