| 摘要 |
1,036,588. Printing surfaces. ROTARY PLATES Ltd. July 9, 1964 July 10, 1963. No. 27395/63. Heading B6C. A relief printing plate such as an electrotype and which is to be fitted to a cylinder is curved or bent to shape whilst in contact with a complementary member which supports and fills the non-printing areas of a plate, the member being stripped from the plate after the bending operation. In one method, after an electrotype is formed and backed in the usual manner, a complementary member is made by placing a fibre-reinforced thermosetting phenol-formaldehyde resin in sheet or particulate form over the plate and applying pressure by platens to cure the resin. According to a second method, the backed-up electrotype mould is used as the complementary member. After forming the mould 4 of vinyl chloride, vinyl acetate copolymer from an original in the usual way it is provided with a plane outside face 9 merely by planing if thick enough, or by using a filling 8, e.g. of a suitable polyester or epoxide resin with a curing agent, and planed. The electrotype 10 is formed on the mould 4 and backed as at 11 and the composite article is passed through a bending machine. The complementary member may be attached to the electrotype by adhesive, or the original may be etched at its surround to form keying dots in the plate and the complementary member, slipping thus being prevented during the bending operation, |
