PERFORMANCE OF HEADBAND TYPE HEARING PROTECTORS
The better hearing protector is not the one with the highest attenuation rating but the one with with the adequate rate for the specific work place it is intended to be used in and the lowest possible tension. Tension is the force the wearer is experiencing by the cups of the heaing protector. The higher the tension the more likely it is that the user will not accept wearing the hearing protector longer than a few minutes. The adequate attenuation rate for the job is what really matters to avoid overprotection by only staring at the highest SNR rate. Overprotection exists when the hearing protector supresses all surrounding sounds. The result is accustic isolation of the user leading to tiredness and concentration problems. Being unconcentrated never helps to enhance quality and worse than that it can result to injury or death. How does the ROCKMAN hearing protector range avoid these problems ?
As a plastic manufacturer we have to admit that price has to be adressed as main benfit of using plastic. As hearing protectors never are being used under the same climatic circumstances, it is fact that plastic is reacting far more intense than steel. Therefore the tension tends to be very different depending from the climatic circumstances the plastic headband is being used in. Even the use of high quality plastic is strongly due to varying tension rates. Please compare the loss of tension after 4 and 8 hours of permanent use. Curve 1 shows the tension loss rate of a headband made from plastic compared to a headband from stainless steel wirel.
Headband from stainless steel!
Main benefit of the stainless steel wire headband is surely not the price but the supply of constant tension rate at all temperature and humidity conditions the user has to work in. For permanent, professional use a hearing protector with constant tension is required to provide a reliable attenuation rate which will not vary any hour. By the use of stainless steel wires we don´t have to cmpromise our goal of achieving a very low tension rate + an impressive noise supressing performance. The new patented DualElastan headband guarantees a maximum of tension constancy as the wires are supported by a rigid frame of plastic they are mounted to and then moulded in with TPE. The result combines the benefits of steel and plastic.
Our Professional Quality hearing protectors with steel wires have an average tension rate of 8,7 N, only 62% of the 14 N tolerated by European Norm 352 describing the testing procedure for hearing protectors.