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In National Institute of Technology in Japan,the food processing device using the underwater shock wave has developed [1].The processing mechanism is crushing with the spalling phenomenon of shock wave.The effect is extraction improving,softening,sterilizing etc.with non-heating.The pressure vessel for crushing for the processing of the variety foods has been designed and manufactured.We need a pressure vessel for food processing by underwater shock wave.We propose making the pressure vessel by the explosive forming.Only a few of these pressure vessels will be made.One design suggestion of the pressure vessel made of stainless steel was considered.The pressure vessel is needed that the length,thickness and depth of it were 500mm,8mm and 200mm,respectively.