| 摘要 |
PROBLEM TO BE SOLVED: To cope with expansive or contractive change by providing a bend joint preventing two eaves gutters connected at right angled from being broken because of the contact with a fascia board even if thermal expansion is repeated in accordance with thermal fluctuation and making it unnecessary to change a design providing a large round corner. SOLUTION: This bend joint 1 for eaves gutter is made of a synthetic resin having 15-50 Mpa in the tensile strength, 80-200% in the tensile elongation, 500-2,000 Mpa in the bending modulus. The synthetic resin for the bend joint 1 is selected from a graft copolymer of polyvinyl chloride and an ethylene-vinyl acetate copolymer, an acrylonitrile-methacrylate-stylene block copolymer, an acrylonitrile-methacrylate-stylene block copolymer, and a polymer alloy with a polyester. Accordignly, it can cope with thermal deformation or expansible/ contractible change.
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