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TPU 樹脂 (Thermoplastic Polyurethane) ,由在1950年時即由 Schollenberger
等人開發出來,由於其具有優異之機械性質和彈性 (excellent mechanical and elastic
property),極具耐磨耗性 (high abrasion) 和抗化學性質 (high chemical
resistance),以及其與血液和細胞組織有很好的相容性…等等特殊性質,因此迅速的發展成為一種日生活中和醫療上極為重要的材料。又因為TPU具有上述之優越性能,所以其應用範圍相當廣泛,如皮革工業、接著劑、彈性纖維
(elastic fiber、Spandex
fiber) 、生醫材料 (biomaterial)
,橡膠業改質劑…等等皆有其產品。另外,TPU之加工技術亦極為容易,使用一般之聚合物加工設備便可以加工之,如:射出成型
(injection molding)、擠壓成型
(extrusion)、延壓成型 (calendar)、紡絲 (spinning)、溶劑澆鑄 (solvent casting)…皆可。
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Hardness (ASTM-2240) Polyether PolyolPolyester Polyol 70A-65D75A-65D
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TPU供應商之介紹
SOME SUPPLIERS OF COMMERCIAL TPU s
Trade name of series Supplier DesmopanElastolanCaprolanJectothane
TexinEstane BayerElastogranElastogranAlbis Plastics (UK)
MobayBF Goodrich
典型TPU之射出成型的加工條件
TYPICAL INJECTION MOULDING CONDITIONS FOR A TPU
Mould temperature (℃)Period of maximum injection pressure (s)Period of holding pressure (s)Cooling time (s)Screw speed (rpm)Cylinder zone temperature (℃)Feed chamberTransfer area of screwCompression area of screwInjection nozzle 405104080
150170180190
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TPU Feed Middle Front Nozzle hardness(IRHD) zone zone zone 85 170 190 200 190 90 175 200 210 205 95 190 205 220 210
TPU之射出成型產生缺陷時之改進對策
Typical defect →
Cause of problem ↓ Voids Splintering and flaking Surface blisters Flow lines and marks Burns, burn streaks Sink spots Flash formation Part adheres to mould Material temperature too high × × × × × × Material temperature too low × Mould temperature too high × × Mould temperature too low × Granulate too moist × × × Follow-up pressure too low × × Clamping pressure too low × Injection pressure too high × Injection pressure too low × × Injection speed too slow × Injection speed too fast × × ×
Some causes of typical moulding defects in injection moulded TPU.
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WORLD CONSUMPTION OF POLYURETHANES
INDUSTRY % of Total Furniture and MattressesAutomotiveBuildingRefrigerationShoeTextilesCoatingsOthers 39161374678
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更新期別: 2003IKE09-0. Date: 2003/11/27.
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