| 摘要 |
PROBLEM TO BE SOLVED: To prevent degradation of working environments due to dust and to improve processing capability by injecting water together with specified blast media. SOLUTION: When water soluble salt includes first water soluble salt of 60 to 90 wt.% for blast media and second water soluble salt which is 1 to 20 wt.% for blast media and is higher than first soluble salt in dissolving speed to water, it is desirable that dissolving speed of blast media can be increased as compared with a case where water soluble salt includes only first water soluble salt. Blast media is 1 to 10 mm in average grain diameter of a weight reference. When the average grain diameter of blast media is less than 1 mm, blast media is inadequate because blast processing capability is low. In order to obtain an excellent peeling effect and a high scattering effect, 0.01 to 10 kg of water for 1 kg of blast media is supplied to a tip of an injection nozzle, injecting blast media to an object to be processed by using pressurizing gas.
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