Sterlco BP 1000 Series Beside the Press Granulators - Manual (Page 16)

1000 Series Granulators Chapter 2: Functional Description 16 of 45
2-4 Safety Features
Safety Switches
Safety switches at all access covers are wired into the starter control circuit. The machine
cannot be started when these parts are open. However, for safety purposes, the machine
should be disconnected from the power lines by a disconnect switch or by removing the plug
from its receptacle. Check all safety switches periodically for proper operation.
Safety Tags
A set of metal plates are attached to the machine to warn of potential danger.
Sound Reduction Equipment
Sound reduction equipment will bring the sound level of your machine to within the
limitations of the Occupational Safety and Health Act. Material, part configuration, feed rate,
and ambient noise level must be specified at the time of inquiry.
Research has been conducted to assess the noise generated by the operation of Sound
Enclosed Granulator Models 1012 and 1018.
The testing is intended to determine a General Noise Level during the operation of the
granulator. Although the operating noise levels vary with different processed materials,
material configurations, throughputs, and conveying methods, the information presented here
will give the user an average noise level that operators may be exposed to.
Reference was made to the following technical regulations to establish the noise emitted by
the machine:
• 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 1012 and 1018
(Figure 2) and the test methods used to establish the noise level generated are described
below (Figure 4). Figure 3 gives the mean sound levels Lpm in dB(A) for each model of
machine, as well as an average of the sound levels measured at the four positions shown on
the diagram below.