Packaging Can and Method and Apparatus for Its Manufacture
AssigneeCrown Packaging Technology, Inc.
InventorsNicholas James Caunter, Tanya Ruth Gledhill, Ian Maxwell, Maurice Riviere
Life of this patent
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Abstract
A can for packaging food, comprising a metal can body and a diaphragm lid (16) formed of lidding material which comprises a multilayer structure with at least an aluminium layer of from 6 to 90 microns thickness and a bond layer for fixing the lid (16) directly to the can body. One method for forming the can forms the lidding material by using an outwardly extending curl (20) at one end of the metal can body as the draw die. Lidding material which is carried by the body maker punch is drawn around the curl of the can body draw die so as to form the lidding material into a cup shape.
Claims14
A can for packaging food, comprising
- a metal can body having an access opening;
- and
- a lid for closing the access opening, the lid being fixed directly to the can body;
- wherein the lid is formed of lidding material which comprises a multilayer structure with at least an aluminium layer of from 6 to 90 microns thickness and a bond layer.
A method for manufacturing a can for food packaging, the method comprising:
- supporting a lidding material on a punch;
- forming a metal can body having an outwardly extending curl at one end;
- supporting the opposite end of the can body on a base support;
- moving the can body and punch relative to each other;
- and
- drawing the lidding material which is carried by the punch along a surface of the can body which is parallel to or inclined at an angle to the can body centre axis so as to form a cup-shaped lid from the lidding material;
- and
- sealing the lid directly to the can body surface.
An apparatus for forming a can body of a food can, the apparatus comprising:
- a metal can body having an outwardly extending curl at one end;
- a base support for supporting the opposite end of the can body and comprising a plate with a central mandrel extending into the can body;
- and
- a punch which has an end portion diameter which is an interference fit with the can body inner wall diameter and lid;
- in which the can body acts as a forming die so that lidding material which is carried by the punch is formed into a cup shape by drawing around the curl of the can body and held against the can body sidewall for bonding.
Dependencies are inferred from the claim text.