Process for producing two-piece can and two-piece laminated can

Details Process for producing two-piece can and two-piece laminated can Process for producing two-piece can and two-piece laminated can

B - Operations, Transporting

21

D

B21D 51/26 (2006.01) B65D 8/16 (2006.01)

Patent

CA 2617890

In a method for producing a two-piece can, a circular disk of a laminated steel sheet having a thermoplastic resin coating layer is subjected to multistage forming to produce a final formed body having a height h, a maximum radius r, and a minimum radius d (the case where r is equal to d is also included). Forming is performed so that the height h, maximum radius r, and minimum radius d of the final formed body satisfy the relationships 0.1 <= d/R <= 0.25 and 1.5 <= h/(R - r) <= 4 with respect to a radius R of a circular disk before forming whose weight is equal to that the final formed body. At an intermediate stage of forming, a formed body is subjected to heat treatment at a temperature of not less than a melting point of a thermoplastic resin but not more than a temperature 30°C higher than the melting point.

La présente invention concerne un procédé de fabrication d'une boîte en deux parties. Une plaque circulaire constituée d'une plaque d'acier stratifiée ayant une couche de revêtement de résine thermoplastique est soumise à un moulage en plusieurs stades, pour former un produit fini moulé d'une hauteur h, d'un rayon maximal r, et d'un rayon minimal d y compris le cas dans lequel r et d sont identiques. Le moulage s'effectue dans une fourchette telle que la relation entre la hauteur h, le rayon maximal r, et le rayon minimal d et le rayon R de la plaque circulaire avant moulage, dont le poids est équivalent au poids du produit fini moulé, satisfasse aux formules suivantes : 0,1 = d/R = 0,25 et 1,5 = h/(R-r) 4. Pendant le moulage, le traitement thermique consiste à chauffer le produit moulé à une température supérieure ou égale au point de fusion d'une résine thermoplastique et inférieure ou égale au point de fusion +30°C.

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