| 摘要 |
PROBLEM TO BE SOLVED: To provide an inner mold for molding a bent pipe capable of simply performing drawing-out work after bending processing. SOLUTION: In the inner mold used for molding the bent pipe by heating a straight pipe comprising a synthetic resin pipe to bend the same at a predetermined bending angle, a plurality of panel materials 21, etc., having flexibility are stacked to form a structure having a shape coming into contact with the inner surface of the synthetic resin pipe 1 at a part easy to generate deformation in the pipe but not coming into contact with the inner surface of the pipe at other part.
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