| 摘要 |
PROBLEM TO BE SOLVED: To provide an extremely simple method to remove a welding bead generated caused by heat welding of the end of a synthetic resin window frame member 10 and solve a blushing phenomenon brought in the bead removal position. SOLUTION: Both ends of a synthetic resin window frame member 10 are heated, butted against each other and heat-bonded together. The heat-bonded bead 13 built up in the heat-bonded joint is removed, and then, the bead removal part 14 is heated by an optional heating means at a glass transition temperature ±30 deg.C of the synthetic resin as a raw material to solve the blushing phenomenon brought in the bead removal part 14. |
