Aluminium sheet with rough surface

B - Operations – Transporting – 21 – B

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B21B 1/22 (2006.01) B21B 47/04 (2006.01) B41N 1/08 (2006.01) B21B 1/38 (2006.01) B21B 1/40 (2006.01) B21B 3/00 (2006.01)

Patent

CA 2170749

Aluminium sheet suitable for use as a lithographic plate support has a surface that is uniformly rough by virtue of: a rippled topography having an aspect ratio of at least 1.3 on a scale of 5 - 200 µm; and a superimposed pitted structure on a scale of 1 - 20 µm. A method of making the aluminium sheet involves pack rolling two aluminium ribbons to generate facing surfaces having the transverse rippled structure; followed by a small amount of a conventional or graining treatment to develop the pitted structure.

Une feuille d'aluminium appropriée pour être utilisée comme support de plaque lithographique, présente une surface qui est uniformément rugueuse en vertu : d'une topographie ondulée ayant un rapport d'aspect d'au moins 1,3 sur une échelle de 5 à 200 mu m; et d'une structure en peau d'orange superposée sur une échelle de 1 à 20 mu m. Un procédé de fabrication de cette feuille d'aluminium comprend un laminage en paquet de deux rubans d'aluminium pour créer des surfaces se faisant face ayant une structure ondulée transversalement; puis on pique et on granule légèrement la surface selon ce qui se fait habituellement pour développer la structure en peau d'orange.

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