Abstract:
A thin wall metal can is described having a converging neck portion and cylindrical chimney with a threaded sleeve (110) encircling the chimney and restrained from rotation on the chimney by splines (118) on an inner surface (120) of the sleeve (110) firmly engaged against an outwardly projecting shoulder on the can between the neck portion and chimney. The sleeve receives a threaded closure for closing and sealing the can.
Abstract:
A can end (1) is formed with a score (3) by pressing the end between a score die (2) and an anvil (13). The score die comprises a truncated "V"-shaped projection (9) having a first score sidewall (10) typically at about 55 DEG to the longitudinal axis of the projection, and a second score sidewall (11) typically at about 15 DEG to the longitudinal axis. The score die has a horizontal land portion (12) between the first and second sidewalls. The score die produces a score (3) having sidewalls (16 and 17) which are at different angles to the longitudinal, and this helps to prevent the formation of "angel hairs", i.e. thin slivers of the film (23) coating the base of the score which can otherwise become detached on operation of the tear panel (15).
Abstract:
A can end (13) is manufactured by forming an end shell (5) comprising a seaming flange, chuck wall, centre panel and countersink etc. The end shell is converted to an easy open can end by forming a score and raising a rivet on the centre panel, and attaching a tab to the rivet. The end is subsequently reformed by moving the centre panel (9) relative to the seaming flange (7) to raise the centre panel to a height above the level of the seaming flange. The end is secured to a can body which has been filled with product, and then reformed a second time to lower the centre panel (9) to a height below the level of the seaming flange (7), in order to reduce the headspace within the package.
Abstract:
The invention relates to a method for the production of a lock ring using a wireshaped material which is welded so as to form a ring, and then transformed by several operations into a ring with shaped cross section. As a result of this transformation, the sealing area (9) has greater wall thickness, so as to avoid a sharp edge (13) which could injure the user, as well as to guarantee the resistance necessary to attach or remove a lock membrane (31).
Abstract:
A process for forming a rivet from a sheet of metal, typically double reduced steel, comprises a first operation to produce a blister (25) surrounded by an annular corrugation (39). A second stage forms this blister into a boss by flattening the corrugation between a die (35) and a support (30) so as to push metal back towards the centre of the blister. Finally, the boss is converted into an upstanding hollow rivet in conventional manner.
Abstract:
Method and device for forming a mouthpiece (40) integrally with the top plate (38) of a metal container. The mouthpiece (40) is formed integrally with the top plate by forming the mouthpiece from a cylindrical shape previously pressed out from an opening formed in part of the top plate (38) between an outer die (B) having the shape of the inner periphery of the mouthpiece, and an inner die (A) having the shape of the outer periphery of the mouthpiece. The inner die (A) is of a rotary type which can open radially at its lower opening. The inner die is inserted into the base in its compressed form. The openable outer die (B) is engaged with the outer side of the moutpiece plate in its expanded form, is contracted radially, then expanded radially while the inner die (A) is rotated, and the inside of the mouthpiece is pressed to the inner peripheral groove of the outer die (B) by the projection (18) at the lower outer periphery of the inner die (A). The radial expansion of the inner die (A) is performed by inserting an expanding member (28) driven axially in at the tapered end into the lower opening of the inner die (A).
Abstract:
A reduced length ecology tab is provided for a can end. The can end includes an end panel and a rivet affixing the tab to the end panel. The tab includes a body having first and second opposing ends, and a length measured by the distance between the first end and the second end. A nose portion is disposed at or about the first end, and a lift portion is disposed at or about the second end. The length of the tab is less than 0.985 inch.
Abstract:
A can end (12) including a center panel (14), an annular portion (16) disposed about the center panel (14), a standard chuck wall (18A) disposed about the annular portion (16), and a curl (20) extending radially outwardly from the standard chuck wall (18A). The annular portion (16) includes an enhanced annular countersink (110).