Improved easy-open end and method of making

B - Operations – Transporting – 21 – D

Patent

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Details

B21D 51/44 (2006.01) B21D 51/38 (2006.01)

Patent

CA 2403961

A method of making and easy-open end for a container includes steps of forming first (20) and second (22) grooves in a panel (42) of a can end blank (40), the grooves extending below the level of the panel to form inner (21) and outer (23) beads and forming a central bead (24) in the panel between the first and second grooves so that the central bead extends above the panel. A score (28) is then formed along the central bead by simultaneously forming the score and compressing the central bead, so that the depth (Tc) of the score and the thickness (Tp) of the central bead are both positively controlled. The inner and outer beads are then forced toward each other and then toward the panel, and the central bead is forced toward the panel. A pull tab (34) is then fixed to the end. This process permits the score residual (Tr) to be controlled to a greater tolerance than the conventional processes, and is also more material efficient.

Cette invention se rapporte à un procédé de fabrication d'un dessus de récipient à ouverture facile qui consiste à former une première (20) et une seconde rainure (22) dans un panneau (42) d'une ébauche de dessus de boîte métallique (40), ces rainures s'étendant sous le niveau du panneau, afin de former des cordons interne (21) et externe (23), et à former un cordon central (24) dans ledit panneau entre la première et la seconde rainure, pour que ce cordon central s'étende au-dessus du panneau. On forme ensuite une incision (28) le long du cordon central, en comprimant le cordon central au moment de la formation de l'incision, pour que la profondeur (Tc) de l'incision et l'épaisseur (Tp) du cordon central puissent toutes les deux faire l'objet d'un réglage positif. Le cordon interne et le cordon externe sont ensuite poussés l'un vers l'autre et vers le panneau, et le cordon central est poussé vers le panneau. Un onglet (34) est ensuite fixé à ce dessus de boîte métallique. Ce procédé permet le réglage de la dimension résiduelle (Tr) de l'incision avec une plus grande tolérance que les procédés classiques, et ce procédé est également plus efficace du point de vue de l'utilisation du matériau.

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