SYSTEM FOR CLEANING FLEXOGRAPHIC PRINTING PLATES

Abstract

There is provided a system or apparatus for washing out flexographic printing plates. The system is presented in two distinct embodiments or aspects. In one embodiment the system is provided with a large number of rotating brushes which are at least partly immersed in a liquid bath. The second embodiment is based on a flat brush with an eccentric suspension

Claims

1. A system for treating printing plates with a liquid, comprising: a vessel containing the liquid for cleaning the printing plates; means for conveying the printing plates to be treated through the liquid; a structure rotatably supporting a plurality of brushes of substantially cylindrical shape and provided with sets of bristles attached to a substantially flat support of each brush, said brushes having their shafts orthogonal to the printing plates to be treated, said brushes submerged at least partially in the liquid, wherein at least half of the sets of bristles of said brushes are angled 50-85 degrees, such as 70-85 degrees, and more preferably 80-85 degrees, relative to said flat support.

2. The system according to claim 1, wherein the at least half of the sets of bristles of said brushes are radially angled.

3. The system according to claim 1, wherein nozzles are provided in the center of the brushes of substantially cylindrical shape enabling delivery of cleaning liquid to the zones in which the brushes treat the printing plates.

4. The system according to claim 1, wherein the bristles are made from Nylon or polypropylene.

5. The system according to claim 1, wherein brushes may be different in design and operation allowing individual drive, speed, pressure adjustment, and bristle type of the brushes.

6. A system for treating printing plates with a liquid, comprising: a vessel containing the liquid for cleaning the printing plates; means for conveying the printing plates to be treated through the liquid; a support structure supporting a plurality of sets of bristles attached to support structure, said bristles submerged at least partially in the liquid and arranged so that the bristles touches the printing plate to be treated; wherein at least half of the sets of bristles are angled 50-90 degrees, such as 50-85 degrees or 70-85 degrees, and more preferably 80-85 degrees relative to support structure, andsaid support structure is eccentrically pivoted onto a support frame, so that it can be moved by a motor with an orbital motion along a plane parallel to the printing plate to be treated.

7. The system according to claim 6, wherein nozzles are provided in the support structure between the bristles enabling delivery of cleaning liquid to the zones in which the bristles treat the printing plates.

8. The system according to claim 6, wherein the bristles are made from Nylon or polypropylene.

9. The system according to claim 6, wherein the sets of bristles are attached to support structure so that adjacent sets of bristles in at least one axis are angled relative to each other in an angle of 50-85 degrees.

10. The system according to claim 9, wherein the axis is transverse to the axis along which the printing plates are to be conveyed.

11. The system according to claim 9, wherein the axis is parallel to the axis along which the printing plates are to be conveyed.

12. The system according to claim 6, wherein the support structure is segmented, allowing individual drive, speed, pressure adjustment, and bristle type of the segments of the support structures.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG. 1 shows a sectional side view of the brush system according to the first aspect of the present invention.

[0027] FIG. 2 shows a partial top plan view, slightly inclined, of the system of FIG. 1.

[0028] FIG. 3 shows a top view, slightly inclined, of the brush system according to the second aspect of the present invention.

[0029] FIG. 4 shows a bottom view, slightly inclined, of the system of FIG. 3.

DETAILED DESCRIPTION OF THE INVENTION

[0030] Referring to FIGS. 1 and 2 there is shown a system for treating printing plates according to the first aspect of the present invention. There is shown the structure (1) rotatably supporting a plurality of brushes (2) of substantially cylindrical shape and provided with sets of bristles (3) attached to a substantially flat support of each brush, said brushes having their shafts (4) orthogonal to the printing plates to be treated. As can be seen from FIG. 2 the bristles (3) are angled about 75 degrees relative to said flat support.

[0031] Referring to FIGS. 3 and 4 there is shown a system for treating printing plates according to the second aspect of the present invention. Specifically there is shown a support structure (10) supporting a plurality of sets of bristles (30) attached to the support structure (10). The sets of bristles are angled about 75 degrees relative to support structure (10), which is eccentrically pivoted onto a support frame (20) so that it can be moved by a motor (not shown) with an orbital motion along a plane parallel to the printing plate to be treated.