技術資訊
Katakura and Guo* presented a research study in this subject, aiming to provide data necessary for establishing industrial safety standards.
A waterjet with a diameter of 0.2 mm and up to 200 MPa pressure was used in this study. Commonly used industrial safety helmets were cut in halves and then impacted with the jet at different angles, different stand-off distances, and different pressures. The helmet is made from fiber-reinforced plastics (FRP). Its thickness varies between 1.4 mm and 2.8 mm. The face shield was simulated with 2 mm thick acrylic resin plates. The time from the jet exiting the nozzle till penetration was recorded with a hand-operated stop watch. Jetting was stopped after 30 seconds if no penetration occurred.
The results are summarized as follows:
Their conclusion was that the commercially available helmets and face shields are useful protective devices if the jet is kept at a suitable distance away.
* Katakura, H. and Guo, C. (2006) Research on personal protective devices for water jetting operation --- performance of head and face protectors, Proceedings of the 8th Pacific Rim International Conference on Water Jet Technology, Oct. 10-12, Qingdao, China, Paper 42.
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