W-HARPS
Screens made of corrugated wires with slotted sieve openings
Product Description:
W-HARPS are screens made of continuous corrugated round longitudinal wires vertical to the sieve plane, with cross wire layers woven in at specific intervals. The clear width between each two longitudinal wires is the gap width.
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The spacing between the crosswire layers is usually 60 - 150 mm but can also be smaller or larger or different in the individual screens.
Advantages:
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W-HARPS are suitable for all screening machines with a clamping device.
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​They also classify difficult-to-screen materials, because in addition to the vibrations of the screening machine, there are also the natural vibrations of the longitudinal wires with low amplitude between the crosswire layers. These wire vibrations largely prevent materials from sticking and clogging the screen, meaning they create a good self-cleaning effect. Whether and when thin- or thick-wire W-HARPS are to be preferred depends on the material. Thin-wire W-HARPS should be used for difficult screening and thick-wire ones for dry or moist (but not sticky) material.
For information on standard specifications and material data, please refer to the data sheet.
G-HARPS
Screens with slotted sieve openings and smooth sieve surface
Product Description:
G-HARPS are screens made of smooth, gap-forming longitudinal wires (or with intermediate cranking as an expansion reserve), with crosswire layers of 3 x 1 or 3 x 2 wires each woven in recessed at specific intervals.
The clear width between two longitudinal wires is the gap width.
G-HARPS have fixed crosswire layer spacings.
It is not possible to divide the crosswire layers without rubber strips on the dimensions of the supporting beams of the screening machine frame.
For information on standard specifications and material data, please refer to the data sheet.
Advantages:
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G-HARPS with their slotted screen openings and smooth longitudinal wires are suitable for all screening machines with a tensioning device.
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G-HARPS consist of strong longitudinal wires in relation to the gap width, with cross wires woven in tightly and deeper than the screening plane.
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This screen is characterized by its smooth sieve surface
- high stability
- secured gap width
- highest screening performance
- wear-protected cross wires
- long service life
which enable advantageous use instead of finely woven square or long mesh cloths for the purpose of grain separation, dewatering or desludging of materials.
VARIA-HARPS
Fabric-like screens made of round wires
Product Description:
VARIA harps consist of alternately side by side lying smooth and in the screening plane horizontally corrugated wires with round bends, which are held by cross wire layers woven in at certain distances in such a way that only the corrugated longitudinal wires can have a springy freedom of movement.
The spacing between the cross-connections is determined by the thicknesses of the used wire but should be designed in such a way that there is one cross-connection on each of the cross supports of the screening machine frame.
Advantages:
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Why VARIA-Harps?
Because screening materials containing particularly high moisture have always presented a difficult classification problem, and with conventional screens the mesh openings become clogged very quickly.
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VARIA-Harps provide the solution when square or rectangular sieve openings are required for precise grain separation and normal screens are not sufficient in extreme cases.
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VARIA-Harps largely prevent clogging or encrustation of the sieve openings due to the combination of smooth wires and horizontally corrugated wires.
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In VARIA harps, the thicker smooth wires have a low vibration amplitude; they serve as carriers of the sieving material. The corrugated wires, due to the corrugations, have a greater elongation with an elastic effect. Due to the different vibration amplitudes of the wires, the sieve openings of the VARIA harps remain free.
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VARIA harps are suitable for all screening machines, namely:
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a) with cross wire layers and tensioning folds for longitudinal tensioning and cross tensioning machines.
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b) with PUR- and rubber strips as "screen plates" for screening machines with flat screen decks.
For information on standard specifications and material data, please refer to the data sheet.
S-HARPS
Fabric-like screens made of round wires
Product Description:
S-HARPS are screens made of individual longitudinal wires corrugated continuously in the sieve plane with square sieve openings in a diagonal hole pattern. The individual longitudinal wires lying flat next to each other are held in place by crosswire layers woven in at specific intervals in such a way that the longitudinal wires have a springy freedom of movement between these cross-connections.
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The spacing between the cross-connections is determined by the thicknesses of the used wire, but should be designed in such a way that there is one cross-connection on each of the cross supports of the screening machine frame.
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Advantages:
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S-HARPS have square screen openings. The springy freedom of movement of the individual longitudinal wires allows natural vibrations that make the screen "elastic" so that even difficult-to-screen material can be processed. Whether damp, wet, heavily smearing, clayey or dry material.
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S-HARPS
- clean themselves
- counteract clogging
- ensure sharp grain separation
That is why S-HARPS are versatile, especially wherever there is a risk of clogging for screens with fixed mesh openings. -
S-HARPS are suitable for all screening machines, namely:
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a) with cross wire layers and tensioning folds for longitudinal tensioning and transverse tensioning machines.
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b) with PUR or rubber strips as "screen plates" for screening machines with flat screen decks.
For information on standard specifications and material data, please refer to the data sheet.