GRAVURE COATING
First Claim
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1. In a gravure printing machine for coating continuous surfaces, the improvement comprising:
- a cylindrical gravure surface having a gravure pattern, said pattern having first and second side zones, the cells in each of said side zones varying in capacity to apply coating material according to a predetermined pattern as a function of circumferential distance along the gravure surface in the direction in which the gravure surface is successively applied to the surface being coated, the positioning of said side zones along the circumference of said cylinder together with the width of said side zones being related to the circumferential distance around the surface to be coated such that the portion of the surface being coated by said first side zone will also be coated by said second side zone, said pattern in first side zone being complementary in density to said pattern in said second side zone whereby to provide substantially uniform overall coating density.
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Abstract
A variable gravure pattern is employed on a gravure cylinder used in the overlapping coating of a cylindrical body, such as a so-called tin can, with paint or shellac. The overlapping coating provides a substantially uniform coat because of the variable gravure pattern while avoiding the pronounced line of demarcation at the start of the coat and at the end of the coat which occurs when there is a double thickness of coating in an overlap area.
9 Citations
8 Claims
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1. In a gravure printing machine for coating continuous surfaces, the improvement comprising:
- a cylindrical gravure surface having a gravure pattern, said pattern having first and second side zones, the cells in each of said side zones varying in capacity to apply coating material according to a predetermined pattern as a function of circumferential distance along the gravure surface in the direction in which the gravure surface is successively applied to the surface being coated, the positioning of said side zones along the circumference of said cylinder together with the width of said side zones being related to the circumferential distance around the surface to be coated such that the portion of the surface being coated by said first side zone will also be coated by said second side zone, said pattern in first side zone being complementary in density to said pattern in said second side zone whereby to provide substantially uniform overall coating density.
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2. The gravure printing improvement of claim 1 further comprising:
- said gravure pattern having a central zone, said side zones being positioned on either side of said central zone, the cell pattern in said central zone providing a uniform coating density on the surface to be coated equal to said uniform overall coating density provided by the overlapping of said side zones.
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3. The gravure printing improvement of claim 1 wherein:
- said pattern in each of said side zones is a substantially linear variation in cell capacity to apply coating material, said variation being from a maximum at the ends of said side zones closest to one another to a minimum at the ends of said side zones most removed from one another.
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4. The gravure printing improvement of claim 2 wherein:
- said pattern in each of said side zones is a substantially linear variation in cell capacity to apply coating material, said variation being from a maximum at the ends of said side zones closest to one another to a minimum at the ends of said side zones most removed from one another.
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5. The gravure printing improvement of claim 1 wherein:
- said first and second side zones are of substantially equal circumferential width.
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6. The gravure printing improvement of claim 2 wherein:
- said first and second side zones are of substantially equal circumferential width.
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7. The gravure printing improvement of claim 3 wherein:
- said first and second side zones are of substantially equal circumferential width.
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8. The gravure printing improvement of claim 4 wherein:
- said first and second side zones are of substantially equal circumferential width.
Specification