| 摘要 |
PROBLEM TO BE SOLVED: To compactly ensure strength and to facilitate coupling of a drain by a method wherein a protrusion part for reinforcement is integrally formed at a boundary corner part between the bottom and the outer surface of a gutter along the boundary corner part. SOLUTION: The strength of a gutter 10 against a force as shown by an arrow mark A exerted on the gutter 10, is ensured by a minimum member for reinforcement. For this purse, a protrusion part 50 for reinforcement is formed only along a boundary corner part 10D between a gutter part 10A and a decoration surface 10B. Bending in a longitudinal direction A of the gutter 10 is prevented from occurring and a strength therefor is provided by a minimum member for reinforcement. In this case, the composition of the gutter 10 is molded at a linear expansion factor of 4×10<-5> / deg.C or less and a bending elastic modulus of 500kg/mm<2> or more. Further, the decoration surface of the protrusion part 50 is formed flush with a decoration surface 10B of the gutter 10. In this way, the protrusion part 50 is prevented from being visually recognized as a protrusion part in terms of external appearance but is recognized as a part of the gutter 10 and improves decoration properties and outward appearance from the view point of external appearance. This constitution ensures through compact structure and facilitates coupling of a drain.
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