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• 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
Model Motor Power Impeller Speed
Production ∗
∗∗
∗
75% Production
Test Supply (SPI
Method)
kW Rev./min. Kg/h Kg/h Pcs. No./min. Kg/h
BP1012
5.5 340 140 105 24 99.5
BP1018
7.5 340 200 150 36 149.0
Figure 4: Average Sound Levels
Model BP1012 Sound Enclosed Model BP1018 Sound Enclosed
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.