•S.P.I. Noise Test – Noise Measurement Procedure for Granulators, by the Society of the Plastic Industry.
•UNI7712 – Machine Tools – Determining Noise in the Working Environment – 1977
•ISO3746 – Acoustics – Determination of Sound Power Level of Noise Sources – Engineering method for free field conditions over a reflecting plane – 1981
•ISO3746 – Acoustics – Determination of Sound Power Level of Noise Sources – Survey method – 1979
•DIN45635 – Measurements of airborne noise emitted by machines – Enveloping measuring method – 1972.
The technical specifications of the Sound Enclosed Granulator Models BP1012 and BP1018 (Figure 3) and the test methods used to establish the noise level generated are described below (Figure 5). Figure 4 gives the mean sound levels Lpm in dB(A) for each model of machine, as well as an average of the sound levels measures at the four positions shown on the diagram below.
Figure 3: Noise Test Specifications
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| Impeller Speed |
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| Production ∗ |
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| 75% Production |
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| Test Supply (SPI |
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| kW |
| Rev./min. |
| Kg/h |
| Kg/h |
| Pcs. No./min. |
| Kg/h | |||||
| BP1012 | 5.5 |
| 340 |
| 140 |
| 105 |
| 24 |
| 99.5 |
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| BP1018 | 7.5 |
| 340 |
| 200 |
| 150 |
| 36 |
| 149.0 |
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Figure 4: Average Sound Levels |
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| Model BP1012 Sound Enclosed | Model BP1018 Sound Enclosed | ||
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| Position | Sound Levels in dB(A) | Position | Sound Levels in dB(A) |
| 1 | 84.3 | 1 | 86.0 |
| 2 | 83.6 | 2 | 85.6 |
| 3 | 82.6 | 3 | 84.1 |
| 4 | 82.2 | 4 | 84.1 |
| Lpm | 93.2 | Lpm | 85.0 |
∗All Granulators provided with 5/16” (8 mm) Diameter Hole Screen.
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