| 摘要 |
PROBLEM TO BE SOLVED: To achieve a lower cost even in the case of a multi-kind small-lot production and moreover, provide a water stopping function by enabling forming of a protective layer for a piping or the like even on the external surface of any complicated tank wall in a production process. SOLUTION: In a bubble jet bathtub in which a gas supply pipe 5 is arranged along the external surface of a tank wall such as a bottom wall 2 to allow jetting of bubble into a bathtub from a nozzle device 3, a protective layer 12 made of a urethane elastomer is formed on the external surface of a tank wall such as the bottom wall 2 by coating, for example, by spray coating. A nozzle mounting part 11 and a gas supply pipe 5 are buried into the protective layer 12 along the external surface of the bottom wall. |
