RESIN MEMBER, THERMAL WELDING METHOD THEREFOR, AND APPARATUS THEREFOR

摘要

PROBLEM TO BE SOLVED: To efficiently heat a welding surface to certainly weld the same to a part to be welded thermally even in a thick-walled resin member. SOLUTION: A pouring port opening member 1 is constituted so that the welding surface 11a heated by infrared rays to be thermally welded to the outer surface of the upper part of a container is covered with an outer layer material 21 having a hue of which the brightness is lower than that of a part other than the welding surface 11a. In this case, the infrared absorbing ratio of the welding surface 11a becomes higher than that of the part other than the welding surface 11a and the welding surface can be efficiently heated.