| 摘要 |
PROBLEM TO BE SOLVED: To make fouling and odors hard to remain, and also, easy to remove, and improve both of the heat insulating property and the outer appearance by applying an electrolytic polishing treatment on the internal surface of an internal container, and also, specifying the surface roughness Rz of the treated surface. SOLUTION: For this vacuum double container made of stainless steel, an internal container 1 and an external container 2 made of stainless steel are doubly combined with a gap, and a vacuum heat-insulating space 3 is formed between the internal and external containers. Then, the internal surface of the internal container 1 is a smooth surface having a gentle uneven shape, on which, an electrolytic polishing treatment is applied without a blast treatment. In addition, the surface roughness Rz is set to be less than 0.4μm, and the heights of the indented sections and the protruding sections when being microscopically seen are kept small, and contamination is hard to enter and hard to settle down. Also, even when contamination enters the indented sections, the contamination is easy to remove by washing with water or the like. Therefore, the vacuum double container is hard to stain, and odors do not remain as well. Also, as the smoothness of the internal container 1 increases, the outer appearance of the surface is improved, and the heat-insulating property by the vacuum double container structure made of stainless steel having a low heat conductivity is improved as well.
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