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HAVER & BOECKER
Methods for Fitting Screen Section
Side Tensioning
The screen with hook strips is mounted across the direction of material flow. Screen sections with particularly strong wires can be mounted at the feed end of the machine. Changing the screen section in 1 or 2 deck machines is fast and easy as only the defected screen section has to be exchanged. Retensioning is easy because the longitudinal sides of the machines are generally easily accessible. The tensioning bar on side tension machines also serves as wear protection. The legs of the hook strips should be shorter than the tensioning bar in order to avoid producing undersized grains.
End Tensioning
Screening is possible over the whole surface. There are no sealing problems at the borders of the screen sections, so no oversized grains can pass during sieving.
To improve the sealing of some special screens it is possible to fix a rubber strip along the longitudinal side.
Wire Screens with Hook Strips: Measurements and Tolerances (ISO 14315)
Side Tensioning
Spa Measurement between outsides of the hook strips
Tolerance: + 0 / - (8 + d) mm
End Tensioning
Spi Measurement between insides of the hook strips
Tolerance: + (8 + d) / - 0 mm
Spia Measurement from inside the hook strip to outside of flat bent tensioning bar
Tolerance: + (8 + d) / - 0 mm
Side and End Tensioning
Fl Overall length of hook strips - Tolerance: + 0 / - (5 + 2d) mm
Δp Parallelity of hook strips - Tolerance +/- 4 mm auf 1000 mm length
Download:
Industrial Wire Screens
Screen Frames and Re-Screening Service
Ultrasonic Screening Systems with Frequency Variation
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