Blanket cylinder for offset presses
View Patent ↗A blanket cylinder has a rotational axis and a concave surface, concentric to the axis and extending over a printing width of the cylinder, for receiving a flat rubber blanket made of elastically deformable material. The cylinder has a recess concentric to the axis, extending over the printing width, and a film fitted in the recess The film has an outside surface which forms the concave surface of the blanket cylinder.
1. A blanket cylinder for a printing press, said blanket cylinder having a rotational axis and a concave surface, concentric to said axis and extending over a printing width of said cylinder, for receiving a flat rubber blanket made of elastically deformable material, said cylinder comprising:
a recess concentric to said axis and extending over said printing width; and
a film fitted in said recess, said film having an outside surface which forms said concave surface of said blanket cylinder.
2. A blanket cylinder as in claim 1 wherein said recess has a concave surface, said film having a uniform thickness.
3. A blanket cylinder as in claim 1 wherein said film fills said recess.
4. A blanket cylinder as in claim 1 wherein said recess has a cylindrical surface, said film being received against said cylindrical surface.