耳塞是一种经济有效的护耳器。近年来国内外出现的EAR型泡沫塑料耳塞,具有质软、舒适、密闭和隔声好的特点,受到使用者的欢迎。但圆柱型的EAR耳塞直径大于成人外耳道,必须经手指搓细后才能放入外耳道内,依其慢回弹性能将外耳道口密闭。实践证明,多次使用后由于反复搓揉,特别是经油污的手指搓捏,将改变开孔泡沫 Earplugs are a cost-effective ear protector. In recent years, EAR-type foam earplugs appeared both at home and abroad have the characteristics of softness, comfort, airtightness and good sound insulation, and are welcomed by the users. However, cylindrical EAR earplugs larger than the diameter of adult external auditory canal, you must rub the fingers rubbed into the external auditory canal, according to their slow recovery of the external auditory meatus mouth closed. Practice has proved that, after repeated use because of repeated rubbing, especially by oil finger rubbing, will change the open-cell foam