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    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.

    Stirling motor – power through heating and cooling

    The engine conceived by the Scotsman Robert Stirling back in 1816 has had to wait a long time for its implementation. The fundamental principle of operation is two pistons operating in an enclosed space that is formed through two cylinders and a regenerator and is filled with helium. One of the cylinders is heated from the outside and the other is cooled.

    The expansion of the gas when it is heated and retraction when it is cooled moves the pistons and transfers the energy that they produce onto a flywheel. A key role in this process is assumed by the regenerator that acts as a heat exchanger. In close co-operation with forward-thinking investors, PACO has developed an extremely efficient regenerator from highly heat-resistant PACO metal wire cloth. This represents an important step in the practical implementation of the Stirling engine.

    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. 

    Diesel soot filter made of PACO special cloth

    Long before EU regulation to reduce fine dust in breathing air came into force, PACO were closely working together with their customers to create suitable diesel soot filters. PACO developed a special cloth that will hold back more than 99 % of critical micro particles in the range of 10 – 1000 nm.

    The high performance of the diesel soot filter solution is based on the optimum interaction of the chosen materials and their application-specific design. Examples for this are the combination of metal wire fabric and sintered metal cloth.

    Filter Technology

    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.

    Filter presses

    The production of chocolate as well as other foods and beverages often requires a large number of screening and filtering processes. Cocoa beans, for instance, have a very high fat content that has to be significantly reduced during processing. This excess fat is removed with presses operating at pressures of up to 1000 bar in conjunction with metal wire cloths that have to be robust and of top quality. That is why numerous PACO metal wire cloths, sieves and filter solutions are involved in the chocolate manufacturing process.

    For instance PACO filter elements put in a tremendous performance in the cocoa press. They are made up of a number of layers to ensure that they can withstand the enormous forces of the presses. Once the cocoa mass and cocoa butter have been separated, other screening and filtering steps are used to extract the cocoa powder and further process the cocoa butter, for instance to produce cosmetics or culinary delights such as chocalate coatings, nougat or a fine selection of filled chocalates.

    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.

    Synthetic fibre production, PACO spin pack filter

    The heart of any synthetic fibre production is the spinneret with its various components, one of which is the spin pack filter. This decisively influences the quality of the fibres produced and the cost-effectiveness of the production process. PACO has developed a new generation of spin pack filters with an increased filter area that enables a higher throughput volume and longer lifetimes.

    Important to this are advances in pleating technology used in the filter cloth. Additionally, the design of the filter edge has been optimized so that the risk of leaks can be further minimized. The new PACO spin pack filters can be tailored as required for any production process with respect to parameters such as flow rate, viscosity, pressure loss and lifetime.

    EMI - Shielding Against Electromagnetic Interference

    Computers and other electronic devices can be easily upset by electromagnetic interference. The remedy: EMI/RFI shielding – the screening of devices, housings, systems and complete rooms.

    In close co-operation with their customers, PACO has developed tailor-made EMI shielding solutions. The high-precision geometry of PACO cloths and variety of permutations available through combinations of mesh size, wire gauge and choice of material in conjunction with the experience of PACO specialists provides an optimum solution for each individual screening situation.

    Micro fibre production – super thin through PACO spin pack sieve

    A number of modern functional textiles made of fleece, e.g. for protection against low temperatures as well as for work, sports and casual clothing owe their high performance reputation to super fine micro fibres. Until recently, the standard measurement for micro fibres was “1 dtex“.

    This indicated that a 10 km long (Polyester) thread was only allowed to weigh 1 gram. PACO has developed a spin pack sieve that enables 0.25 dtex super micro filament yarns to be produced! As melt spinning demands extremely high precision and reliability, synthetic fibre manufacturers around the World like to rely on PACO pre-polymer filter candles, product filters and spin-pack filters.

    Rainwater treatment

    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.

    Acoustic absorption for aircraft engines

    The development of increasingly powerful aircraft engines, that has currently peaked with the engines for the Airbus 380, would not be possible without the simultaneous reduction in noise emission. New composites for “acoustic screens“ enable noise to be absorbed within the power plant. High-precision PACO PZ metal wire cloths are an important component in the composite for integrated acoustic screens.

    Spin packs for melt filtration

    When economically producing high quality synthetic fibres, it is extremely important that foreign particles do not block the extremely fine spinnerets. To ensure this, PACO has developed special filters based on PACO RDW or RDTW dutch weaves. They cover a filtering range of 40 – 500 µ. PACOs range covers the customary methods of producing most common synthetics fibres from polyester to polyamide with wide viscosity range. Products include stand-alone filters, filter packs for interchangeable screening systems and extruders as well as coils of cloth for continuously operating filter systems such as “AUTOSCREEN“.

    Rotary screen printing with PACO SD-AM precision cloths

    With the introduction of the SD-AM cloth family in 1999, PACO helped the advancement of screen printing both qualitatively as well as economically. As the innovative cloth has almost no expansion (low-elongation) and a high mesh stability in conjunction with extreme flexibility (high-tensility), it is optimally suited to high resolution rotary screen printing. Longer screen lifetimes, faster fitting with low risk of tearing, optimized reproduction quality, high printing speeds – these are all significant advantages of PACO SD-AM when compared to conventional screen printing cloths made of stainless steel wire or synthetic fibres

    Fine and ultra-fine screening – without clogging

    The finer that the granules to be screened are, the higher the chances of a fine sieve mesh becoming clogged. PACO produces ultra-fine sieve meshes that can separate particles of 25 µ in industrial applications and even 15 µ in laboratory environments. This provides a seamless transition between the technologies of screening and filtration. The problem of ultra-fine screen meshes becoming clogged is solved by PACO with the PACO DSS Vibration Frame Systems. This has special excitation springs that quickly accelerate the sieve mesh to prevent clogging and blinding and thereby ensure increased screening performance.