Ultra-high molecular weight polyethylene thin-wall pipe, and method of an apparatus for manufacturing the same
AssigneeMitsui Petrochemical Industries, Ltd.
InventorsTakeshi Shiraki, Iwatosi Suzuki, Kunie Hiroshige
Life of this patent
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Abstract
An ultra-high molecular weight polyethylene thin-wall pipe which is uniform in thickness and free from a folded mark as well as a method of and an apparatus for manufacturing the same. The ultra-high molecular weight polyethylene thin-wall pipe is manufactured by supplying ultra-high molecular weight polyethylene into and melting and kneading, continuously extruding the molten substance of the ultra-high molecular weight polyethylene from a die connected to a screw of the screw extruder to form a cylindrical roughly shaped article, and diametrically expanding the cylindrical roughly extruded article by means of a tapered core and taking up.
Claims12
An ultra-high molecular weight polyethylene thin-wall pipe without a folded mark made of ultra-high molecular weight polyethylene having an intrinsic viscosity (.eta.) of 5.0 dl/g or more, having an outer diameter of 10 mm or more and a uniform wall thickness of 0.2 mm to 5.0 mm with a ratio of the outer diameter to the wall thickness of 10 or more.
An ultra-high molecular weight polyethylene shrink pipe without a folded mark made of ultra-high molecular weight polyethylene having an intrinsic viscosity (.eta.) of 5.0 dl/g or more, having an outer diameter (D1) of 10 mm or more and a uniform wall thickness (t1) of 0.45 mm or more with a ratio of the outer diameter to the thickness (D1/t1) of 10 or higher, and having a coefficient of shrinkage of 20% or more in a diametrical direction at 140.degree. C.
An ultra-high molecular weight polyethylene thin-wall pipe without a folded mark made of ultra-high molecular weight polyethylene having an intrinsic viscosity (.eta.) of 5.0 dl/g or more and having an outer diameter (D2) of 10 mm or more and a uniform wall thickness (t2) of 0.2 mm or more with a ratio of the outer diameter to the thickness (D2/t2) more than 10, and having a coefficient of shrinkage of 5% or less in a diametrical direction at 100.degree. C.
An ultra-high molecular weight polyethylene shrink pipe without a folded mark made of ultra-high molecular weight polyethylene having an intrinsic viscosity (.eta.) of 8.0 to 30.0 dl/g, having an outer diameter (D1) of 5 to 150 mm and a uniform wall thickness (t1) in the range of 0.2 to 3.0 mm with a ratio of the outer diameter to the thickness (D1/t1) 10 or higher, and having a coefficient of shrinkage of 20% or more in a diametrical direction at 140.degree. C.
An ultra-high molecular weight polyethylene thin-wall pipe without a folded mark made of ultra-high molecular weight polyethylene having an intrinsic viscosity (.eta.) of 8.0 to 30 dl/g and having an outer diameter of (D2) 10 mm to 100 mm and a uniform wall thickness (t2) of 0.2 mm to 5.0 mm with a ratio of the outer diameter to the thickness (D2/t2) more than 10, and having a coefficient of shrinkage of 5% or less in a diametrical direction at 100.degree. C.
Dependencies are inferred from the claim text.