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OFFINGEN - Airborne fine dust is to a considerable extent detrimental to human health. Fine dust contamination is particularly high in conurbations and industrial zones.
Picture: Filter bag for filtration of fine dust made of needlona® needle felt or fiberglass fabric laminated with an ePTFE membrane.
Primary fine dusts particularly occur during industrial combustion processes such as for instance in waste incineration plants, cement works or power plants or also in the metalworking industry. By using effective filter media to combat all types of dust, industrial filtration makes a valuable contribution to keeping the air clean.
For more than 40 years now, BWF Envirotec has been producing innovative filter media for industrial filtration. BWF Envirotec is now extending the product portfolio with the new PM-Tec product line and is offering new filter media specifically used in filtration of minute dust particles. The name for the new product line originates in the English term for fine dust, "particulate matter". The term particulate matter was coined at the end of the 80's by the US environment protection authority, the EPA (Environmental Protection Agency), which introduced in the form of the so-called PM standard a classification in measurement of fine dust. This fine dust categorization is now used internationally for classification of fine dust.
A continuous process chain for the highest quality
The new PM-Tec product line represents the highest demands on a filter medium for industrial filtration. BWF Envirotec combines in the new product line first-rate carrier media consisting of needlona® needle felt or fiberglass fabric with a high-efficiency ePTFE membrane and the decades of experience in filter medium production. The continuous in-house process chain, starting with the manufacture of needlona® filter media, including the laminating process, to finishing of complete filter bags guarantees the high quality standard of PM-Tec.
PM-Tec: filter medium with an ePTFE membrane for extremely low emission
The product line consists of a carrier medium on which an ePTFE membrane is laminated. The membrane produced from polytetrafluorethylene possesses characteristics which are optimally suited for use in industrial fine dust filtration.
Dust on the raw gas side impinges on the filter medium, is already retained on the surface and cannot penetrate into the carrier medium. Owing to the smooth and antiadhesive surface, the particles do not embed themselves in the carrier medium but accumulate on the surface of the filter medium instead and are almost completely cleaned away during the dedusting process in the filtration system.
BWF Envirotec gives utmost priority to the latest state of the art and ideal characteristics of the individual components in the new PM-Tec product line. The membrane structure is characterized by optimum orientation and fineness of the fibrils, in addition to a uniform pore size. A low surface tension which reduces the adhesion of fine dusts in addition to a temperature resistance of up to 288°C ensure optimum filtration properties. During the production process too, BWF Envirotec has perfected the manufacture of filter media. Consequently, in-line quality controls and constant air permeability monitoring are performed during the laminating process. The membrane-compatible presentation of the filter media during the entire production process ensures maximum quality. The most demanding emission requirements can be fulfilled by appropriate sewing and sealing technology during the manufacturing process.
Extremely low and stable differential pressure behavior, constant gas volumetric flow, long service lives, low maintenance expenditure and utmost reliability furthermore characterize the PM-Tec product line from BWF Envirotec.
needlona® needle felt or fiberglass fabric as the carrier medium
The new PM-Tec product line for fine dust filtration is available with two different carrier media.
Fiberglass fabric offers high temperature resistance and is therefore encountered as a carrier for the ePTFE membrane in many industrial applications. The prerequisite for many years of successful use is a moderate gas composition and low mechanical stress of the fiberglass fabric during operation in addition to a specifically adapted pretreatment of the fabric during manufacture. Under aggressive conditions of use, a carrier medium made of a customized needlona® needle felt can be selected that withstands the chemical and mechanical demands for a longer period that the fiberglass and therefore achieves longer service lives.
BWF Envirotec supplies the new product line as material from the roll for manufacturers of filter bags and as made-up filter bags for manufacturers or operators of industrial dedusting plants.
All-round customer care by BWF Envirotec from recommendation of the filter media to after sales service
PM-Tec finds applications in all industrial dedusting plants where very fine dust occurs in the production or manufacturing process. For instance, in the cement industry, waste utilization plants, power plants, in the chemical and pharmaceutical industry and also in the metal or plastics processing industry. Which filter medium is used for which dedusting process is specifically determined at BWF Envirotec for each customer order. Taking account of the operation-specific characteristics of the filtration system and with emphasis on the most economical solution, our specialists recommend the right filter medium for each specific application from the wide array of products in the PM-Tec product line. The PM-Tec filter medium, whether made of fiberglass fabric or needlona® needle felt such as polyphenylene sulfide, polytetrafluorethylene or polyester, therefore guarantees extremely low emission in the filtration system. Our comprehensive service portfolio ensures that PM-Tec filter media are always in perfect condition at all time, which is why complete installation of PM-Tec filter bags, preventive inspection and maintenance and also filter bag inspection form part of our scope of service.
© BWF Envirotec / BulkInside
This article is published by BWF Tec GmbH & Co. KG
BWF Envirotec is the world's leading provider of filter media for industrial dedusting, product filtration and solid/liquid separation. Our extensive range of filter media includes synthetic needle felts as roll goods, ready-to-install filter media, a wide ...View company page