Sandvik Process Systems is a developer and manufacturer
of steel belts, press plates and processing systems

Perforated steel belt

Perforated steel belts enabling the drying media, for example hot air, to be transferred 'through' the steel belt, so that the air is in contact with all parts of the product on the belt.

Sandvik offers perforated belts with five standard perforation patterns which cover ring most requirements. A broad range of other patterns, with a minimum hole diameter of 0.8 mm (0.03 in.) and different spacings, can be provided to suit specific applications.

Standard perforation patterns

Special patterns and other types of holes are available on request.

Type of pattern Hole diameter
mm (in.)
Triangular picht, mm (in.) Open area,
%
2.0 (0.079) 3.5 (0.128) 29.6
2.5 (0.098) 5.0 (0.197) 22.7
3.0 (0.118) 5.0 (0.197) 32.6
3.0 (0.118) 6.5 (0.256) 19.3
5.0 (0.217) 9.5 (0.374) 30.4

Round hole perforations with triangular pitches, as shown in the figure below, are standardized. The triangular base is parallel with the running direction of the belt.

Hole diameter (d), mm Triangular pitch
(p), mm
Open area, %
2.0 3.5 29.6
2.5 5.0 22.7
3.0 5.0 32.6
3.0 6.5 19.3
5.0 9.5 30.4

Special patterns and other types of holes are available on request.

Limitation of perforation
Unperforated edges Unperforated center on longitudinally welded belts
Normal 25 mm 50 mm
Minimum 10 mm 25
Maximum 65 mm -
Perforation length toleranes
Belt ≤50 m long ±100 mm
Belt longer than 50 m ±100 mm

Special treatment of the perforated holes as grinding or deburring are available on request.

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