| Enclosure |
| Noise source |
Intervention |
Follow‐up |
Initial noise level |
Noise level after |
Reference ID |
| Conveyor |
An enclosure was put over the conveyor at a cost of GBP 2000 and the conveyor speed was changed to reduce jar clashing |
not reported |
96 dB |
86 dB |
HSE 2015 |
| Grinder |
Enclosure over the grinder |
not reported |
93 dB |
85 dB |
Morata 2015 |
| Not reported |
Use of an enclosure with acoustical foam to deburring area |
not reported |
104 dB |
82 dB |
| Feeder |
Enclosing the bowl feeder |
not reported |
116 dB |
86 dB |
Maling 2016 |
| Compressed‐air knives |
Enclosed machine |
not reported |
91–92 dB |
Below 85 dB |
HSE 2013 |
| Glass‐bottle conveyor |
Enclosed the conveyor noise levels |
not reported |
Above 90 dB |
reduced by 2‐8 dB |
| Blower machine |
Enclosed machine using sound‐absorbent panels |
not reported |
above 90 |
Below 90 dB |
| Bottle‐blowing machines |
Machine enclosed and segregated |
not reported |
94 dB |
89 dB |
| Hammer mill |
Enclosed in an acoustic booth |
not reported |
102 dB |
87 dB |
| Rinser‐filler‐capper machine |
Enclosed machine |
not reported |
85 dB |
73 dB |
| Glass jars clashing together on conveyor |
Fitted enclosure and changed conveyor speed |
not reported |
96 dB |
86 dB |
| Bottles banging together on filler infeed conveyor |
Fitted covers over conveyor |
not reported |
96‐100 dB |
92 dB |
| |
Number of cases: 12 |
mean before |
mean after |
mean reduction |
| Noise level (dB) |
96.3 dB |
85.5 dB |
11.8 dB |
