| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of an eaves trough capable of preventing the occurrence of deformation or molding strain at the time of molding and suitable for manufacturing a composite eaves trough which is partially molded in a multilayered state. SOLUTION: The eaves trough is manufactured by coating a part of the eaves trough main body 1, which is made of a synthetic resin and extruded from an extruder, with a weatherable resin and cooling and shaping the partially coated eaves trough main body 1 by first-third forming dies 23, 24 and 25. This manufacturing method of the eaves trough is characterized in that (1) the partially coated eaves trough main body 1 is quenched by the first forming die 23, (2) the clearance of the eaves trough passing part of the second forming die 24 is 1.1-1.5 times with respect to each of the clearances of the eaves trough passing parts of the first and third forming dies 23 and 25 and (3) annealing treatment is performed by the second forming die 24. COPYRIGHT: (C)2006,JPO&NCIPI |
