Method of producing a bent resin tube

摘要

A method of producing a bent resin tube by heating a certain portion of a straight resin tube to be bent partially by a partial bending means, and bending the heated certain portion partially by a partial bending die, thereby rendering a desired bend shape to the tube. In this method, a large die for constraining the shape of the whose tube or a large oven is not required. Therefore, space for equipment can be reduced, and production efficiency is enhanced because the time required for bending operations is decreased remarkably. The heating may be done by high frequency induction heating, high frequency dielectric heating, or other conventional heating.