RESIN-MADE PIPE

• Main Author: SAKAI Taiga
• Format: Patent
• Language: English; French; Japanese
• Published: 27.05.2022
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; BLASTING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LIGHTING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PIPES; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THEIR PREPARATION OR CHEMICAL WORKING-UP; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A resin-made pipe formed using as a material a liquid crystalline polyester resin composition, and comprising a curved portion, wherein the melt viscosity of the liquid crystalline polyester resin composition satisfies formula (A), and the arithmetic mean roughness (Ra) of the inner surface of the pipe in the extending direction thereof is 0.2-5 μm.　(A): B/A≤10 (A represents the melt viscosity at 20°C + the flow initiation temperature of the liquid crystalline polyester resin composition. B represents the melt viscosity at the flow initiation temperature of the liquid crystalline polyester resin composition.) L'invention concerne un tuyau en résine formé en utilisant comme matériau une composition de résine de polyester cristallin liquide, et comprenant une partie incurvée, la viscosité à l'état fondu de la composition de résine de polyester cristallin liquide satisfaisant la formule (A), et la rugosité moyenne arithmétique (Ra) de la surface interne du tuyau dans la direction d'extension de celui-ci est de 0,2 à 5 µm.　(A) : B/A ≤ 10 (A représente la viscosité à l'état fondu à 20 °C + la température d'initiation d'écoulement de la composition de résine de polyester cristallin liquide. B représente la viscosité à l'état fondu à la température d'initiation d'écoulement de la composition de résine de polyester cristallin liquide.) 液晶ポリエステル樹脂組成物を形成材料とするパイプであって、パイプは、湾曲部を有し、液晶ポリエステル樹脂組成物の溶融粘度は、下記式（Ａ）を満たし、パイプの延在方向における内側表面の算術平均粗さ（Ｒａ）が０．２μｍ以上５μｍ以下である樹脂製パイプ。　Ｂ／Ａ≦１０...（Ａ） （Ａは、液晶ポリエステル樹脂組成物の流動開始温度＋２０℃における溶融粘度である。Ｂは、液晶ポリエステル樹脂組成物の流動開始温度における溶融粘度である。）