Process for production of easy-open can lid made of resin...

Details Process for production of easy-open can lid made of resin... Process for production of easy-open can lid made of resin...

1993-12-24

2009-12-08

Zacharia, Ramsey (Department: 1794)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

C428S339000, C428S458000, C264S331110

Reexamination Certificate

active

07629038

ABSTRACT:
A process for productive an easy-open can lid made of a resin laminated metal sheet comprising laminating a metal sheet or surface-treated metal sheet on one or both surfaces thereof with a crystalline saturated polyester resin film having a thickness of 10 to 100 μm, an elongation of at least 150%, a degree of crystallinity of not more than 10%, and a heat of fusion of crystalline of not less than 10 joules/g, to form a laminated metal sheet for an easy-open can, forming by a composite cold-forming method a tear-along grooves of a residual thickness of not more than ½ of the thickness of the material using top and bottom dies of a die radius of 0.1 to 1.0 mm, then heat treating the crystalline saturated polyester resin layer at the portion surrounding the tear-along groove at a temperature of at least the crystallization starting temperature and less than the melting point thereof and, also, an easy-open can lid obtained by the same and a resin laminated metal sheet used for the same.

REFERENCES:
patent: 3832963 (1974-09-01), Gayner, et al.
patent: 4887732 (1989-12-01), Matsubayashi et al.
patent: 5131556 (1992-07-01), Iioka et al.
patent: 5234123 (1993-08-01), Layre et al.
patent: 5348809 (1994-09-01), Oyagi et al.
patent: 63-125152 AB (1988-05-01), None

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