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.
| 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.
Related information
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Sandvik Steel Belt - Specification
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Sandvik bake oven belts – the main ingredient for bake oven systems
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