| 摘要 |
PROBLEM TO BE SOLVED: To provide a sheet heating element for heating a tubular product from inside mounted on the inside wall face, which is easy to mount without giving rice to an unnecessarily large protrusion inside the tube, always securely closely contacted. SOLUTION: A stopper is provided at one of the two opposing edges when the sheet heating element is mounted on the inside wall face a tubular product, and an expanding spring is provided at the other, above stopper and expanding spring fitted together. With the spreading force of the spring, above sheet heating element closely contacts with the inside wall face of the tubular product.
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