26 - 28 September 2017 // Nuremberg, Germany

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Zoom product LOGO_Proven sinter-plate filter technology in hygienic design

Proven sinter-plate filter technology in hygienic design

LOGO_Proven sinter-plate filter technology in hygienic design

Proven sinter-plate filter technology in hygienic design

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Besides filtration efficiency, the hygienic design of the whole plant is important for the recuperation of food particles from process air.

Uncontrolled deposits may impair product quality due to ageing effects, bacteria and mixing with other products after product change.

Due to its dead-spot-free design, optimal flow and effective cleaning of the sinter-plate filter, the hygienically designed Herding® RESIST filter series ensures absolute hygienic separation for the thorough processing of high-quality food dust.

Due to the recuperation of food from exhaust air during production which is becoming more and more attractive, Herding GmbH Filtertechnik decided to further develop their proven round filter devices in accordance with the EHEDG criteria. This allows for the highly efficient and reliable recuperation of high-quality food using state-of-the-art filter technology also for utmost hygienic requirements.

High-quality raw materials and smooth surfaces in contact with products

All surfaces of the filter system which are in contact with products are made of high-quality stainless steels with defined surface quality. Thus, there is no exchange of substances between the surface and the products.

The Herding® sinter-plate filters used are made of a rigid sintered PE body with special filter-active coating with PTFE which is homogeneously incorporated in the surface. Thus, the filter medium is extremely resistant to mechanical and chemical load. This special feature is proven by a service life of far more than 10 years in many cases. There have been no cross contaminations with material systems typical for the food industry so far.

The certificate of an independent institute proving the safe use of Herding® sinter-plate filter media is available. Thus, the filter media comply with the relevant EC directives for the use in the food industry and in pharmaceutical sectors.

The metal surfaces are mainly made of cold-rolled stainless steel. Thus, their roughness values are significantly lower than recommended by the EHEDG (Ra < 0.8 μm).

All sealing constructions comply with the EHEDG guidelines for hygienic applications. Fits are designed without any impermissible gaps or dead spots. A detailed maintenance plan ensures that all seals are regularly replaced on the basis of the number of working hours.

Tested tightness

The tightness recently proven in a test complying with the SMEPAC guidelines for applications in environments with highly-effective pharmaceutical products emphasises this high production quality. Thus, any external contamination of filtered products can be ruled out for food applications.

No cavities and hygienic gap design

The construction of the entire filter plant has been checked for its hygienic design following the EHEDG guidelines. There are no dead spots or areas which are not coming into contact with the airflow. The optimal dimensioning of the filter plant as well as its connection and effective application in the production area is ensured by the extensive experience of the manufacturer in the air flow sector. In order to avoid disturbing sources, there are only installations at the raw gas side which are absolutely necessary.

Easy and reliable cleaning

Due to the pure surface filtration of Herding® sinter-plate filters, filtered solid particles remain on the filter surface. They do not ingress deeper filtering layers. Thus, any risk of clogging is avoided. The differential-pressure-controlled cleaning of the surface in intervals using jet pulses is very efficient and reliable. Thus, product does not remain on the filter for longer or undefinable periods of time. Automatic cleaning is very effective and energy-saving due to its short valve opening time. Even for product change, it is usually not required to clean the filter manually.


Optimal flow, reliable automatic cleaning together with pure surface filtration and hygienic plant.

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