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加拿大因科公司与温尼伯市国家工业公司为因科金属公司的曼尼托巴(Manitoba)分公司所经营的汤姆森矿研制成功了一种聚氨基甲酸乙脂凿岩机消声器。这种消声器在一般矿井供气条件下不会结冰,并且可把凿岩机的排气噪声由120～121分贝(A)降至110分贝(A),凿岩机的振动看起来也有所减轻;其凿岩机的凿速也并没有因加装了消声器而降低。此外,聚氨基甲酸乙脂这种材料不
A Canadian Polyurethane Rock Drill Silencer was successfully developed by Inco and Winnipeg National Industries for the Thomson Mine, owned by Inco Metco’s Manitoba branch. This muffler will not freeze under normal mine gas supply conditions and will reduce the auger’s exhaust noise from 120 to 121 decibels (A) to 110 decibels (A) and the rock drills will appear to have less vibration; their rock drills The speed of the chisel did not decrease with the installation of the muffler. In addition, polyurethane is not a material of this kind