| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel door which exhibits high weather resistance while eliminating uneven powder coating. SOLUTION: The steel door 1 is constituted of: a frame body 10; two panel bodies 30, 40 covering the frame body 10 while holding from both sides and formed with powder coating film 50 formed on the outer side faces of the steel plates 31, 41; and middle frames 15 arranged inside the frame body 10 and dividing the space region formed of the panel bodies 30, 40 and of the frame body 10 and having ventilation holes 15a communicating the divided space regions. Provision of the ventilation holes 15a to the middle frames 15 enables air to be convected throughout the entire steel plates 31, 41 inside the steel door 1 for uniform increase in temperature of the steel plates 31, 41. Then, powder coating requiring heat treatment is suitably performed and uneven coating is prevented to enhance appearance quality, providing a high weather resistance steel door thanks to the powder coating. COPYRIGHT: (C)2011,JPO&INPIT
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