LAMINATED METAL SHEET AND PROCESS FOR PRODUCING THE SAME

摘要

Laminating of both major surfaces of metal sheet (3) with two types of films differing in melting point (1,2), in which the thickness of low-melting-point film (2) is regulated. In particular, the thickness (d2) of low-melting-point film (2) at its portion interposed between laminating roll (10) and metal sheet (3) is regulated so as to fall within the range defined by the formula: d2 >= k( MP - T)/V. In the formula, MP represents a melting point difference between the two types of films, k>=2, and 0 < T = MP1 -ϕTi <= 50 (°C) (Ti represents the temperature of metal sheet on the roll inlet side, V the speed of sheet passage, andϕa constant determined according to heat escape condition at laminating, satisfying the relationship 0.75 <=ϕ< 1). Winding of the low-melting-point film (2) round the laminating roll (10) can be prevented by the above thickness regulation.