Adhering particles
Particles that stick to larger grains or to the screen media.
Knowledge of
screening.
Clear explanations of terminology used in screening technology, woven wire cloth and particle classification.
Technical Terms A–Z.
An overview of key terms relating to screen media and screening machines. Contact us for advice on the design suited to your application.
Agglomerate
A cluster of several smaller particles adhering to one another.
Analytical sieve
A sieve with a specified aperture size used to determine particle size distribution.
Aperture count
Number of apertures per specified unit of length.
Aperture width
Nominal clear width of an opening in woven wire cloth.
ATEX
European requirements for equipment and workplaces in potentially explosive atmospheres.
Backing mesh
Coarse mesh supporting and protecting finer wire cloth.
Ball deck
Deck beneath the screen media that holds cleaning balls for ball cleaning.
Blanking plate
A solid plate installed in place of an open screen panel.
Blinding
Blockage of apertures by adhering or trapped particles.
Classification
The process or result of separating material by particle size.
Clear aperture
Unobstructed dimension of an opening in screen media.
Coarse material
Material containing particles larger than the selected aperture.
Control screen
A screen used to remove oversized particles from a material stream.
Crimp
Intentional bend in a wire that forms and stabilises the apertures.
Dedusting
Dry removal of fine dust from the feed material.
Desliming
Removal of very fine particles from wet feed material.
Dewatering
Separation of free water from a solid mixture.
Double crimp
Wire screen with pre-crimped wires in both directions.
Drive system
Components that set a screening machine in motion.
Dry screening
Screening without added liquid.
Effective screening area
The part of a screen deck actually available for separation.
Feed hopper
Inlet section through which material enters the machine.
Feed material
Material supplied to a screening surface for separation.
Fines recovery
The amount of usable fine material passing through the screen.
Flooding
Operating condition in which an excessive feed rate overloads the screening surface.
Gyratory sifter
Machine used for dry classification of fine material.
Harp screen
Screen media with long wire sections and apertures considerably longer than they are wide.
Hook strips
Hook-shaped edge strips used to mount and tension a screen panel.
Longitudinal tensioning
Tensioning screen media in the direction of material flow.
Mesh count
Number of apertures per inch, a measure commonly used in English-speaking markets.
Multi-deck screen
Screening machine with several screen decks arranged one above another.
Nominal particle size
Particle size used to designate a product or discharge stream.
Oblong and broad apertures
Rectangular apertures with sides of different lengths.
Open area
The proportion of open apertures in the total screening surface.
Open screening area
Percentage of the screening surface occupied by open apertures.
Oversize
Portion of the feed material too large to pass through the screen apertures.
Pegging
Particles becoming lodged in individual screen apertures.
Perforated plate
Plate with regularly arranged screening apertures.
Perforated sheet
Sheet metal with punched, drilled or otherwise formed apertures.
Pitch
Distance between the centres of two adjacent apertures or wires.
Plain weave
Weave in which wires alternately pass over and under each crossing wire.
Protective screen
Screen used to retain unwanted coarse material.
Rectangular aperture
Elongated opening with sides of different lengths.
Screen box
Assembly in which the screen media is mounted.
Screen deck
Working level of a screening machine, comprising frame, media and accessories.
Screen edge preparation
Edge finishing for the attachment of hooks or tensioning strips.
Screen media
Replaceable screening surface with apertures for particle size separation.
Screen panel
Ready-to-install screen media, including hook strips where required.
Screen tensioning
Fixing tensioned wire cloth to a frame.
Screening
Mechanical separation of particles according to their ability to pass through an aperture.
Screening assembly
Screening surface together with its mounting or tensioning system.
Screening machine
Equipment that separates particulate material by screening.
Screening surface
The part of a screen containing apertures through which fine material passes.
Selvedge
Finished edge formed during the weaving of wire cloth.
Separation
Process in which smaller particles pass through apertures while larger ones are retained.
Sieve analysis
Determination of the proportions of different particle sizes by sieving.
Size classification
Separation of a particulate mixture into defined size classes.
Size fraction
Range of particle sizes between two defined limits.
Sorting
Separation of materials according to material type.
Square aperture
Aperture with equal dimensions in both directions.
Support frame
Part of the screen frame that provides additional support for the media.
Support screen panel
Coarse-aperture support element beneath finer screen media.
Support structure
Structure carrying the vibrating assembly of a screening machine.
Surface build-up
Accumulation of fine particles on the screening surface.
Tensioning clamp
Component used to secure and tension screen media.
Tensioning edges
Prepared edges of screen media for mounting or tensioning.
Tensioning element
Component that keeps the media taut on its frame.
Test sieve
Standardised sieve frame with a defined screening surface for testing.
Throughput material
Material that passes through a screen aperture.
Transverse tensioning
Tensioning screen media across the direction of material flow.
Trommel screen
Cylindrical perforated or woven screening surface.
Trommel screening machine
Machine with a screening drum rotating about its longitudinal axis.
Tumbler screen
Screening machine combining circular and tumbling motion.
Twill weave
Weave in which a wire passes over or under several crossing wires in sequence.
Ultrasonic excitation
Additional vibration used to reduce blinding of fine mesh.
Undersize
Portion of the material below the specified cut size.
Undersize discharge
The portion of the feed material that passes through the screen panel.
Warp
All wires running in the weaving direction.
Warp wire
An individual wire running in the weaving direction.
Washing
Removal of fine or foreign particles with water.
Washing and rinsing
Removal of fine material during wet screening.
Wear loss
Loss of material caused by friction and mechanical loading during operation.
Wedge wire screen
Screen made of profiled wires forming elongated slot apertures.
Weft
All wires running across the weaving direction.
Weft wire
An individual wire running across the weaving direction.
Wet screening
Screening process carried out with the addition of liquid.
Woven wire cloth
Screening surface woven from wires.
Woven wire cloth and wire screens
Screening surfaces made of crossing wires with regularly arranged apertures.
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