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AssigneeToyo Seikan Kaisha, Ltd.
InventorsSachiko Machii, Kenichirou Nakamaki, Masanori Aizawa, Katsuhiro Imazu
Estimating the term…
A polyester laminated draw-formed can which suppresses frothing phenomenon when a carbonated beverage is contained therein and exhibits excellent corrosion resistance, and a coated metal plate used for the production of the cans. The coated metal plate for cans comprises a laminated material of a metal plate, a polyester film layer consisting chiefly of ethylene terephthalate units and, as required, an adhesive primer layer interposed between the metal plate and the polyester film, wherein the polyester film layer that is on the inner surface side of the can has a surface that is molecularly oriented in at least the biaxial directions, and larger protrusions on the surface over a visual field of 100 .mu.m.times.100 .mu.m as observed using an interatomic force microscope (AFM) have an average height (H) of three points of 0.20 .mu.m or smaller.
A seamless, froth-preventing and corrosion-resistant metal can comprising a can formed from a metal plate and a polyester film layer bonded at an inside surface of the can wherein at least a surface of said polyester film is oriented molecularly in biaxial directions so that the surface of said layer has an inplane orientation coefficient of at least 0.022 and a coarse portion selected from the surface in the can over a visual field of 100 .mu.m.times.100 .mu.m in an interatomic force microscope has a three-point average height (H) of large protrusions of 0.20 .mu.m or smaller.
A seamless, froth-preventing and corrosion-resistant metal can obtained by reduction draw-forming or draw-ironing a laminated material of a metal plate comprising a can formed form a metal plate, a polyester film layer comprising ethylene terephthalate units, and an adhesive primer layer interposed between the metal plate and the polyester film layer, wherein a side wall of the can has a thickness residual factor of 55 to 95%, wherein at least a surface of the polyester film layer at an inside surface of the can is oriented molecularly in biaxial directions so that the surface of said layer has an inplane orientation coefficient of at least 0.022 and a coarse portion selected from the surface in the can over a visual field of 100 .mu.m.times.100 .mu.m in an interatomic force microscope has a three-point average height (H) of large protrusions of 0.20 .mu.m or smaller.
Dependencies are inferred from the claim text.