Waste water treatment with PACO stirring filter dryers
Stirring filter dryers and stirrer devices that can trap solids provide an ideal solution for the effective treatment of waste water. This is particularly the case when subsequent treatment of the separated solids is required – for instance, washing or crushing in the plant. Stirring filter dryers are also used for rainwater harvesting, flood protection, in the building industry, in mining, for liquid manure treatment or for the extraction of biogas. In each case, the frequently chosen filter media are PACO metal filter cloths or PACOPLATE® as filter cassettes.
Cleantech made by PACO
Cleantech – high tech that protects the environment and health – is considered to be one of the most promising markets for the future. PACO has been working in this extremely challenging sector for a number of years and, together with its customers, keeps on developing innovative solutions. PACO filters are, for instance, used to purify flue gases in waste incineration plants, filter water in sewage plants and rainwater harvesting systems as well as for air conditioning and mining applications. PACO special cloths are being successfully used as diesel soot filters.
PACO filter cloths ensure that the efficiency of oil and gas production is improved and high precision PACO screen printing cloths play an important part in photovoltaic development. The demands of our customers for cleantech solutions continues to grow. And with that, PACO’s proficiency in this extremely important area of activity.
Filtration is a fundamental and versatile process that is just as much at home in a production process as it is in environmental engineering or a laboratory. PACO supplies specifically developed filter media for a variety of applications – various types of flat filter, fine filters up to 3 µ filtering accuracy, filter candles, (pressure) filter baskets and special filters made of metal wire cloth, sintered metal fibre and mesh laminates.
In addition, PACO develops and produces complete filtering and screening systems including all of the necessary system elements.
A number of PACO filter innovations have now become proven industrial standards.
HETA HSA automatic filter system
A number of industries use seawater or surface water for the cooling process. An unwanted side effect is that contaminantion through minerals or organic materials in the water can lead to serious malfunctions in the cooling process. Consequently, there is a demand for a reliable and cost-effective means of thoroughly cleaning the process water. This has motivated HETA Verfahrenstechnik GmbH, which is part of the PACO Group, to develop the automatic HETA HSA filter system.
Continuous operation is ensured by its self-cleaning capability. HSA filter system applications range from the chemical industry through petrochemicals or power stations to large shipyards and sewage treatment facilities.
Photovoltaic systems – no electricity without screen printing
To produce electrical current from solar energy, razor-thin metallic contacts of aluminium or silver have to be superimposed onto the front and reverse sides of a silicon wafer. As this requires the utmost precision, a screen printing process with metal wire cloth printing screens is used. PACO has been developing and manufacturing metal wire cloths for the doping and electro-plating of solar cells using emulsion or film technology for almost twenty years.
With the continuous development of high strength cloths PACO has made an important contribution to the continuous development and increases in performance of solar cells. PACO screen printing cloths are now leading the way in quality in the Chinese photovoltaic market – the largest market in the world.
Water is a natural resource that is becoming scarcer as well as more expensive – including its disposal after use. That is why the reclamation and utilization of rain water has become a subject of interest to more and more commercial as well as private users.
To enable rain water to be productively used, it first has to be cleaned, whereby the the filtering system plays a key role. As rainwater has a comparatively low pH value, the screen cloth of the filter system has to be resistant to corrosion. That is why PACO stainless steel screen cloths are materials of choice for this purpose. They are not only available in a wide variety of specifications (type of weave, filter size, finish) but also provide favourable cleaning characteristics and, under normal circumstances, an almost unlimited lifetime. As a supplier of screening and filtering cloths, PACO works together with the leading manufacturers of rainwater harvesting systems.
Filtration, ultra-pure – with PACOSLOT wedge wire screens
In Germany, the purity law is generally associated with beer brewing, although it equally applies to a number of other fluids used in industrial and technical applications. That is why PACOSLOT wedge wire screens are not only used in breweries, but also in a wide range of other processes such as coolant filtration or as resin traps or nozzle filters etc..
PACOSLOT wedge wire screens are not only characterized by their perfect filtration results, but also through the extreme purity of the technology used to manufacture them. They have a spirally running surface structure with axially arranged supporting sections at the cross-over points. As these joints are welded without the use of any additional materials, they are extremely pure.
Production of integrated plastic / metal components
Injection moulding is the most common way of producing plastic components. This, however, does have some disadvantages such as high costs and the need for relatively large amounts of polymers. The process often only becomes cost-effective with larger batch sizes. This situation becomes even more extreme when metal parts such as metal wire screen cloths are to be integrated into a component.
Together with and for the common benefit of our customers FETO and 3P Technik Filtersysteme GmbH, PACO has optimized a rotational process that is being successfully used for the production of large size metal/plastic composite parts. Compared to injection moulding, the advantages of rotational moulding are comparatively low tooling costs together with reduced material requirements for correspondingly lower-priced parts. These advantages also enable small batches to be cost-effectively produced. The experiences that have been gained are so encouraging that PACO has decided to make this process available to other interested customers.
Wood industry, fibreboard production
Whoever thinks that fibreboards are products that are comparatively easy to produce is mistaken. Fully-automated fibreboard production is a demanding process in which the screening of the wood particles plays an important part. The particles that are mainly formed by crushing coniferous wood have to be sorted according to size: the coarser particles will be put into the middle layers of the board and the finer particles in the covering layers at the top and bottom.
All of the particles are mixed with liquid resin and pressed together before being trimmed and sanded. The sieving and selection of the wood particles is carried out by large tumbler screening machines with a screening area of more than 10 m². These have of a number of screening decks placed above each other that each consist of several individual screening frames. PACO supplies sieving cloths and frames specifically for the purpose of fibreboard production and also offers a comprehensive re-screening service including “just-in-time“ logistics.