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US 9,174,262 B2Granted
Can manufacture
AssigneeCrown Packaging Technology, Inc.
InventorsStuart Monro, Alain Presset, Jonathan Riley, Keith Vincent
Life of this patent
Estimating the term…
Abstract
A method and apparatus are disclosed which are suitable for use in the manufacture of two-piece metal containers. In particular, a way of making cups from metal sheet is disclosed using a combination of stretching and drawing operations. The resulting cups have the advantage of having a base thickness that is thinner relative to the ingoing gauge of the metal sheet.
Claims10
A method for manufacture of a metal cup for the production of a two-piece food container, the method comprising the following operations:
- i. a stretching operation performed on a metal sheet, the operation comprising clamping an annular region on the sheet to define an enclosed portion and a clamped portion, and deforming and stretching all or part of the enclosed portion to thereby increase the surface area and reduce the thickness of the enclosed portion, the annular clamping adapted to restrict metal flow from the clamped portion into the enclosed portion during the stretching operation;
- ii. a drawing operation for drawing the metal sheet into a cup having a sidewall and an integral base, wherein the base comprises material from the stretched and thinned enclosed portion, the drawing operation adapted to pull and transfer outwardly material of the stretched and thinned enclosed portion;
- wherein the drawing operation is adapted such that material of the stretched and thinned enclosed portion is pulled and transferred into the sidewall.
Dependencies are inferred from the claim text.