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What is MINIMESH®?

Metal filter cloth has been used as filtration media for over 100 years. W.S. Tyler’s MINIMESH® is characterized by its ease of production, minimal maintenance, and long lifespan. The geometric filter structure is uniform throughout the entire area when compared to fiber-based filter materials made of paper, metal, or plastic. Due to its metallic material, wire mesh filters have excellent mechanical strength and stability, wettability, and high resistance to temperature, chemical, or other physical influences. MINIMESH® filter cloth is used for filtration, fluidizing, drying, screening, and various thermal, electronic, and acoustic applications. In addition, it is suitable for all conventional fabrication processes.

MINIMESH® S metal filter cloth with precision pores.

Using new theoretical calculation methods, W.S. Tyler, along with our parent company Haver & Boecker, advanced the development of metal-filter cloth by creating the MINIMESH® S metal filter cloth generation.

MINIMESH® S filter cloth features optimized pore geometry. The precision pores and cloth structure lead to improved flow capacity and selectivity, providing excellent cleanability, reduced blocking tendency, mechanical stability, and durability.

Faster, more stable, more energy-efficient.
The filter characteristics of MINIMESH® S metal filter cloth can be tailored to the individual needs of the application. Even after processing, in highly formed areas, the predetermined characteristic is maintained; therefore, industrial filtration processes are permanently stable, precise, energy-efficient, and economical.

The best materials for the best woven mesh.
MINIMESH® S metal filter cloth is predominantly made of stainless steel, in grades such as 1.4301, 1.4306, 1.4401, and 1.4404. Other materials can be used per customer request, provided they conform to pre-requisite metallurgical properties for precision wire. You can find more information about special alloys and non-ferrous NE metals in our POROSTAR® Filter Elements brochure  and Materials for Woven Wire Cloth. 

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The Formula

To calculate the geometric pore size, a parameter is determined that describes the diameter of a sphere that is just able to pass through the filter cloth. The pressure loss coefficient for air in the laminar flow field is used to evaluate permeability. The mathematical equations upon which these methods are based were developed by Haver & Boecker in collaboration with the Institut fur mechanische Verfahrenstechnik (Institute for Mechanical Process Engineering) at the University of Stuttgart under the AVIF projects A224 and A251 and confirmed experimentally by the glass-bead test and air flow measurements.

A Distinct Advantage: Reliable Filtration Properties

Compared to other filter media, filter made of wire mesh offer a distinct advantage: their specific properties can be precisely defined geometrically by the weave type, wire diameter, and mesh count. As a result, the geometric pore size and permeability can be accurately calculated in advance, without the need of expensive measuring equipment. The degree of accuracy makes it possible to determine the correct cloth specification for the application and re-producing customized filter elements precisely and economically.

Advantages of MINIMESH® S filter cloth:

  • Precise filter characteristics
  • Flow-optimised cloth structure
  • Precise cut point
  • Glass-bead tested precision pores
  • High flow rate
  • Easy cleaning
  • Low blocking tendency

High Performance: Exact Cut-Point Due to Precision Pores

Mathematically defined in advance, the pore size of the MINIMESH® specification is validated by established evaluation methods. The glass-bead test is an authoritative cross-industry test method for determining the maximum pore size, or “filter cut point”.

Based on the method, the independent, internationally renowned standards institute, Whitehouse Scientific, tested the MINIMESH® filter cloth and confirmed the remarkable properties of the next generation of filters. In particular, for ultra-fine cloth with pore sizes less than 20 microns, the high degree of uniformity of the precision pores yields distinct results.

As an additional quality assurance measure, MINIMESH® S metal filter cloths are bubble point tested. According to the customer’s wishes, the determination and specification of filter characteristics is performed using first bubble, mean pore size, or both of these parameters.

An Immaculate Solution: Improved Purging And Less Blocking

With MINIMESH® S metal filter cloth, the desired filtration effect and flow rate is maintained significantly longer than conventional filter media. The blocking tendency is low and cleaning is easier compared to its counterparts, leading to long-lasting, precise filtration and an extended service life of filter elements.

The careful verification of these properties has been carried out in collaboration with the Institut fur mechanische Verfahrenstechnik (Institute for Mechanical Process Engineering) at the University of Stuttgart. This includes air flow measurement, in which the pressure difference is measured as a function of flow rate, the determination of separation efficiency, the dirt holding capacity with test dust, according to ISO 12103, and the purging properties mentioned in accordance with VDI 3926 Type 2.

To demonstrate the purity of MINIMESH® filter cloth, we use a standardized residual analysis system that differentiates the detected particles according to metallic, non-metallic, and fibrous categories.

Always More Efficient: Good Permeability and Low Pressure Loss

When a fluid flows through a filter medium, a pressure difference is generated between the inlet and outlet sides. This phenomenon is dependent upon the geometric properties of the filter, the load, and the properties of the fluid.

Haver & Boecker specifies the value zeta (ζ) as a parameter for evaluating the permeability of fixed-flow data. This pressure drop coefficient is valid for a flow rate of 1m/second. The smaller zeta, the lower the pressure drop.

Even with a small pore size range, the MINIMESH® S metal-filter cloth achieves a high flow rate with a low pressure drop, which contributes to greater energy efficiency and cost-effectiveness throughout the filtration process.

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