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Otto Markert & Sohn GmbH

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24539 Neumünster • Germany

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Technical terms


Here you will find definitions of all important terms and abbreviations:

Belt filter

Belt filters are horizontal, constantly operating filters. They use vacuum or gravity to mechanically separate solids from liquids. They can be categorised into vacuum-powered conveyor belt filters, carrier belt filters and gravitational filters.


The fabric is passed under heated rollers under pressure. This allows the single threads to be flattened. The fabric becomes thicker and the surface becomes smoother.


The entirety of the threads that run lengthwise (the direction of the fabric) during the production of a fabric.

Chamber filter press

Chamber filter presses are intermittent pressure filters. The pressure chamber is made up of multiple chamber plates arranged back to back. These chamber plates are covered with filter cloths and are connected to each other with the help of drilled holes. The single chamber plates are installed sideways or on top of a frame and hydraulically compressed.

Depth filtration

Depth filtration is based on the concept of particle separation within filter mediums or filter pre-coats with large pores.

Drum filter

Drum filters are used for the continuous mechanical separation of solid-liquid mixtures. A vacuum is used for filtration.


EPDM is the abbreviation for ethylene propylene diene monomer. EPDM is a synthetic rubber that is made from ethylene and propylene.


Filament is the international term for textile fibres of a large, practically “infinite” length.

Filter cake

A filter cake is the moist layer of solid filtered material from slurry that accumulates on the filtering medium.

Filter cake filtration

In a narrow sense, wet filtration is a mechanical separation procedure that uses fabric as a filtering medium. The particles that are separated accumulate on the fabric’s surface and form a filter cake.

Filter cake washing

Cake washing is a method used for removing mother liquor from a filter cake using a liquid that can be mixed with the mother liquor. A distinction is drawn between displacement washing and dilution washing.

Flue gas desulphurisation

Flue gas desulphurisation is a process of removing sulphuric compounds (SO2 and SO3) from fumes (e.g. from power stations, incineration plants or large motors). The sulphuric compounds are formed from burning fossil fuels that contain sulphur.

Frame filter press

A frame filter press has a series of plates that consists of alternately arranged filter plates and frames. The filter cloth is simply hung over the filter plates. Holes are drilled into the frame, usually from above, for the intake of the slurry. The thickness of the frame determines the strength of the filter cake.

Loading hose

Loading hoses ensure the effective discharge, loading and mining of bulk materials in any weather conditions. Loading hose products are made of quality polyester or polyamide materials and have been successfully manufactured at Markert for over 40 years.

Membrane filter press

Membrane filter presses typically have the same structure as chamber filter presses with the difference being that every second plate is covered with an elastic press membrane. For special applications, every plate may contain this elastic press membrane.


If a thread of an infinite length from chemical fibres consists of a single fibre, it is called a monofilament.


Multifil ist die Bezeichnung für endlose Chemiefäden aus mind. zwei Einzelfasern. Dabei muss der Faden durchgehend aus der gleichen Anzahl von Einzelfasern bestehen


A multifilament is a chemical thread of an infinite length made up of at least two single fibres. The same number of single fibres must be present at all points throughout the thread.

Pressure filtration

In a first phase, the chambers of the filter press are filled and filter cake begins to accumulate. The final filter pressure is reached in a second phase, which is the actual pressure filtration. The accumulation of filter cake increases flow resistance, which causes the flow to decrease. A third phase involves all the steps that do not belong to actual filtration, such as filter cake removal and mechanical dewatering.

Sewage sludge

Sewage sludge is the mixture of solid and liquid material that is formed by sedimentation during the treatment of wastewater. Floating solid materials settle in the wastewater and sink to the bottom (sediment).


The treatment of cotton fabrics with boiling water in order to make them shrink resistant.


A liquid that contains solid particles is called a slurry.

Spinning fibre/spinning yarn

Fibres with a finite length that are spun into spinning yarn. The yarn is then used to produce fabrics.

Spliced yarn

Spliced yarn consists of tape fibres that are formed after the mechanical treatment of elongated tapes or tape yarns. They typically have a mesh structure, evident when unwinding the yarn.

Staple fibre

Staple fibres are single fibres of a finite length.


Thermische Behandlung von synthetischen Geweben mit trockener Hitze, Dampf oder Heisswasser, um die Formstabilität zu erhöhen


Thermosetting is the thermal treatment of a synthetic fabric with dry heat, steam or hot water in order to increase the stability of its form.

Transverse current filtration

During transverse current filtration, the particles contained in the slurry are held at the surface of the filtering medium. The filtering medium and the slurry move parallel to one another at partially high relative speeds. The flow direction of the slurry and the filtrate are perpendicular to one another. A shear field is then formed. While it prevents a filter cake from forming, it permits a primary layer of particles whose consistency allows it to flow.


Trommelfilter werden zur stetigen mechanischen Trennung von Fest/Flüssig-Gemischen eingesetzt. Die Filtration findet unter Vakuum statt. 


Wefts are the transverse threads during the production of a fabric.

Yarn stretching

Yarn assumes its textile properties, such as strength, elasticity and low elongation, after it has been stretched several times longer than its original length.

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