Relief printing plate having projections in non-image areas
Abstract
Abstract A printing plate comprising a support, reliefs formed thereon as an image area, and from about 20 to about 4,000/cm 2 small projections thereon in non-image areas, the height of the reliefs being at least 0.05 mm larger than that of the small projections, and a method for making a printing plate which comprises: A. superimposing a photosensitive resin layer having a thickness of at least 0.06 mm on a support, which is at least semi-transparent to actinic light, in intimate contact therewith; B. exposing the resulting assembly to actinic light through an image-bearing transparency from the side of the photosensitive resin layer; C. exposing the assembly to actinic light through a dot-image-bearing transparency having a transparent halftone dot area in a proportion of 1 to 40% from the side of the support to thereby form reliefs on the support, as image areas, and a number of small projections having a height of at least 0.01 mm and being lower than the height of reliefs, in non-image areas, wherein steps (b) and (c) may be conducted in the order: (b) and then (c); or (c) and then (b); or simultaneously.
Inventors
- 👤 Masayoshi Mizuno
- 👤 Tadashi Kawamoto
- 👤 Kiichi Iida
Bibliographic Details
Claims Analysis
Total Claims: 8References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |