WO1990010255A1 - Vorrichtung zum belichten von photopolymeren druckplatten - Google Patents
Vorrichtung zum belichten von photopolymeren druckplatten Download PDFInfo
- Publication number
- WO1990010255A1 WO1990010255A1 PCT/EP1990/000284 EP9000284W WO9010255A1 WO 1990010255 A1 WO1990010255 A1 WO 1990010255A1 EP 9000284 W EP9000284 W EP 9000284W WO 9010255 A1 WO9010255 A1 WO 9010255A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- vacuum
- printing plates
- plate
- fluorescent tubes
- vacuum film
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2022—Multi-step exposure, e.g. hybrid; backside exposure; blanket exposure, e.g. for image reversal; edge exposure, e.g. for edge bead removal; corrective exposure
Definitions
- the invention relates to a device for exposing photopolymer printing plates.
- Untreated printing plates - so-called raw plates - are treated by means of known devices through the processing steps of exposure, washing out and drying in such a way that the treated printing plates can then be used for printing.
- the invention relates to the first processing step of exposing the printing plates, which in turn is divided into the processing steps of pre-exposure and main exposure.
- the raw plate is irradiated with UV light from the underside through the transparent carrier film.
- the printing plate polymerizes from the rear, i.e. starting from the carrier film, with increasing layer thickness.
- the unpolymerized residual layer thus corresponds to the later relief depth.
- the later relief polymerizes and combines with the layer on the base of the relief created by the pre-exposure. This process is called "base" of the relief.
- the intimate, bubble-free contact between the negative film and the printing plate during the main exposure is of crucial importance for the precise transfer of the negative motif to the printing relief.
- One tries to achieve this intimate contact by providing the support table for the printing plate with a groove grid, which is connected to a vacuum pump at several points.
- a UV-transparent film vacuum film is rolled over the entire table surface of the support table.
- This vacuum introduced into the slot grid sucks the vacuum film against the support table.
- a part of the atmospheric pressure that corresponds to the vacuum negative pressure and that acts on the composite printing plate, negative film and vacuum film favored intimate contact.
- the air trapped between the film bearings is pressed out and extracted via the groove grid.
- Dirt particles are very sticky printing plate residues that originate from previous exposures or dust that is attracted from the environment by the rolling up and down of the vacuum film and the associated electrostatic charging of the vacuum film.
- Another problem is the handling of the large-format flexible raw panels; because the tiniest kink makes the plate unusable. Because the turning of the large plates between the pre- and main exposure turned out to be too risky even for two operators, a glass plate with a ground groove pattern and was used as a support Vacuum connection used. The exposure was done with a double set of UV fluorescent tubes; for pre-exposure from below through the glass plate and for main exposure conventional, ie with vacuum film from above. This means that there is no need to turn the plate. The disadvantage of this arrangement was that the groove grid was shown on the printing plate as a change in thickness and appeared in the printed image.
- Figure 1 shows an overall view of the device
- Figure 2 shows a detail of the device
- Figure 3 shows a detail of the device
- Figure 4 shows the groove order of the platen
- the two racks 5, which are located on both sides next to the support plate 14, are arranged like the cover 2 so as to be pivotable about the common pivot point 6.
- the UV fluorescent tubes 7a for the main exposure are accommodated in the cover 2, the UV fluorescent tubes 7b for the preliminary exposure in the base frame 1.
- the latter are covered with an opaque, matt black cloth 9, which is fastened between two rotating toothed belts 10.
- the deflection wheels 11 are connected in pairs with shafts, one of which can be driven by a motor.
- the cloth 9 is delayed (to ensure that all the tubes 7b have ignited) moved at a constant speed by half the length of the toothed belt, so that it comes to a standstill below the tubes 7b and remains there for a certain time. Then it is moved to the starting position in the same direction and at the same speed. The transport times and the pause time in between result in the pre-exposure time.
- the vacuum film 3 is connected at its end to a rod 12, the length of which corresponds to the film width.
- the vacuum film 3 is suspended in a holder on the cover 2 which is not marked.
- the remaining part of the vacuum film 3 is rolled up as a film storage 42 attached to the back of the base frame 1.
- a clamping device not shown, ensures that the vacuum film 3 can be placed under tension by the device operator. In this operation "is folded initially with open lid 2, the pair of racks 5 out of the plane of the cover 2 to the undercarriage. 1 Thereafter, the rod 12 is removed from the holder on the lid. 2
- the rubberized pressure roller 13 now rolls through its own weight over the obliquely arranged glass support plate 14, the pressure plate 17 and Negative film 8, see FIGS. 2 and 3.
- the unwinding speed and the tension of the vacuum film 3 depend on the angle at which the device operator holds the free end of the vacuum film or the rod 12 and how quickly he yields in the vacuum film.
- the two pinions 16 are in engagement with the two racks 5.
- the two carriers 23 are U-shaped and each have a sliding lining 24 with a thickness relative to the racks 5, which give little play to the pinions 16.
- the pressure roller 13 is designed as a hollow cylinder, the inner diameter of which is larger than the outer diameter of the shaft 15. The diameter difference is somewhat larger than the thickest pressure plate 17, so that the pressure roller 13 can roll over it. The axial movement of the pressure roller 13 is limited by the two stop discs 18.
- FIG. 4 shows the groove arrangement of the glass support plate 14.
- the grooves are relatively flat.
- the groove width 29 is approximately ten times larger than the groove depth 30.
- the grooves 25 form an orthogonal grid which is connected to a vacuum pump via the bores 26.
- a circumferential groove 27 runs parallel to the edges of the support plate 14 and leads via the bores 28 to a second vacuum pump.
- the bores 26 and 28 are made as close as possible to the upper starting position of the pressure roller 13.
- the vacuum film 3 is immediately sucked in by the greatest possible negative pressure at the beginning of the unrolling of the pressure roller 13, which then increases during unrolling.
- the two vacuum pumps are switched on shortly before the vacuum film is put on.
- the vacuum pump, which is connected to the grooves 25, is switched off before the exposure or is set to a slight negative pressure.
- the vacuum in the outer annular groove 27, however, remains fully effective until the end of the exposure. It ensures a sufficient seal to the outside or prevents room air from flowing between the support plate 14 and the vacuum film 3.
- the rod 12 which is connected to the end of the vacuum film 3, is hung in a holder (not shown) on the cover 2; likewise the two pivotable supports 23 with the two racks 5.
- large imagesetters are equipped with a device which is shown in FIGS. 5-7.
- Figures 5 and 6 show the device for kink-free placement of the printing plates.
- Figure 7 shows a detail
- two telescopic rails 31 are fastened on both sides parallel to the support plate 14, each of which has two support arms 32.
- the end points of the support arms 32 lie when the telescopic rail 31 is extended in a horizontal plane at the level of the lower edge of the support plate 14; when the telescopic rail 31 is retracted, the horizontal plane is at the level of the upper edge of the support plate 14.
- the four support arms 32 carry a removable table top 33, which is connected to the support arms 32 with a quick-change plug-in closure, not shown.
- the table top 33 has a plurality of grooves 34 with a concentric rectangular shape.
- the innermost groove has a compressed air connection 35 on.
- compressed air is supplied to the inner groove via the compressed air connection 35. This air lifts the pressure plate 17 somewhat and flows to the edge of the table top 33 into the open, pressure equalization in the grooves 34 occurring when the ring grooves 34 cross. This creates an air layer between the table top 33 and the pressure plate, which allows gentle pushing from the transport carriage 36 onto the table top 33 and later, with the telescopic rails 31 retracted, from the table top 33 onto the support plate 14.
- the transfer of the pressure plate 17 from the table top 33 to the support plate 14 takes place when the vacuum pumps are switched on, which are connected to the bores 26 and 28 with the groove systems 25 and 27 and thus hold the pressure plate 17 in suction during transfer to the support plate 14, while the table top 33 moves back into its lower starting position.
- the plug lock between the table top 33 and the support arms 32 is then released and the table top 33 temporarily set aside.
- FIG. 6 Another variant of a device for gentle handling of large-format printing plates is shown in Figures 6 and 7.
- the table top 33 with the previously described groove system 34 and compressed air connection 35 is connected to two longitudinal members 37 and these in turn to the two cross members 41. At the extended ends of the cross members there are two rollers 38 each with a V-shaped groove.
- One rail 39 each with the counter profile is attached to the outside of the base frame 1 parallel to the support plate 14.
- the table top 33 which forms a unit with the longitudinal and cross members 37 and 41, is hung in the need with the rollers 38 in the two rails 39 so that the table with the pressure plate 17 can be pushed with little effort into the upper end position .
- the travel path is limited by the stops 40.
- the manufacturing process corresponds to that described above.
- the advantages achieved by the invention are, in particular, that the vacuum film is always smooth and clean and is applied without wrinkles and bubbles.
- the pre-exposure time is kept exactly by the all-round opaque cloth; the different ignition times of the UV fluorescent tubes are compensated.
- the disturbing image of the slot pattern on the printing plate has been proven to have thermal-mechanical causes: due to the heat development during the main exposure, the photopolymer printing plates lose their rigidity and are pressed into the vacuum grooves by the negative pressure and are thereby permanently deformed. Due to the two separate vacuum systems, the pressure plate is not sucked against the inner groove pattern, i.e. not deformed; at the same time, the outer circumferential vacuum system ensures that the intimate contact between the layers is not canceled out by inflowing air.
- the auxiliary device for placing and removing the printing plates protects them from handling damage and positions them safely and precisely in the imagesetter.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI914020A FI914020A0 (fi) | 1989-02-28 | 1991-08-26 | Anordning foer belysning av fotopolymera tryckplattor. |
NO91913358A NO913358L (no) | 1989-02-28 | 1991-08-27 | Anordning for belysning av fotopolymere trykkplater. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP3906179.5 | 1989-02-28 | ||
DE19893906179 DE3906179A1 (de) | 1989-02-28 | 1989-02-28 | Vorrichtung zum belichten von photopolymeren druckplatten |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990010255A1 true WO1990010255A1 (de) | 1990-09-07 |
Family
ID=6375084
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1990/000284 WO1990010255A1 (de) | 1989-02-28 | 1990-02-21 | Vorrichtung zum belichten von photopolymeren druckplatten |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0461169A1 (de) |
AU (1) | AU5182490A (de) |
CA (1) | CA2046862A1 (de) |
DE (1) | DE3906179A1 (de) |
NZ (1) | NZ232688A (de) |
WO (1) | WO1990010255A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2735717A1 (fr) * | 1995-06-22 | 1996-12-27 | Photomeca Egg | Procede de fabrication de plaques photopolymeres par double irradiation par le dessous |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2527300B2 (de) * | 1975-06-19 | 1977-09-08 | Technigraf GmbH, 6394 Grävenwiesbach | Kontaktkopiergeraet mit einem schwenkbaren kopierrahmen |
DE3144738C2 (de) * | 1981-11-11 | 1984-04-05 | Wilhelm Staub Gmbh, 6078 Neu-Isenburg | "Anlage zum Belichten von Druckplatten" |
EP0141868A1 (de) * | 1982-04-01 | 1985-05-22 | Inc. M & T Chemicals | Photomaskensatz mit hohem Auflösungsvermögen für die Herstellung von Photopolymerbildern |
DE3207903C2 (de) * | 1982-03-05 | 1985-07-18 | Wilhelm Staub Gmbh, 6078 Neu-Isenburg | Anlage zum Belichten von fotopolymeren Materialien |
WO1987002790A1 (en) * | 1985-10-25 | 1987-05-07 | M & T Chemicals Inc. | Device for aligning a photomask onto a printed wiring board |
DE3540107A1 (de) * | 1985-11-12 | 1987-05-14 | Klimsch & Co | Kontaktkopiergeraet fuer uv-empfindliches material |
EP0267600A2 (de) * | 1986-11-12 | 1988-05-18 | Asahi Kasei Kogyo Kabushiki Kaisha | Verfahren zur selektiven Härtung von flüssigen, lichtempfindlichen Kunststoffen durch Belichtung mittels einer Maske |
EP0367244A2 (de) * | 1988-10-31 | 1990-05-09 | Dainippon Screen Mfg. Co., Ltd. | Gerät zur Vakuumkontaktbelichtung eines Originalfilmbildes auf einem photoempfindlichem Material und Verfahren dazu |
-
1989
- 1989-02-28 DE DE19893906179 patent/DE3906179A1/de not_active Withdrawn
-
1990
- 1990-02-21 EP EP19900904310 patent/EP0461169A1/de not_active Withdrawn
- 1990-02-21 WO PCT/EP1990/000284 patent/WO1990010255A1/de not_active Application Discontinuation
- 1990-02-21 AU AU51824/90A patent/AU5182490A/en not_active Abandoned
- 1990-02-21 CA CA 2046862 patent/CA2046862A1/en not_active Abandoned
- 1990-02-26 NZ NZ23268890A patent/NZ232688A/en unknown
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2527300B2 (de) * | 1975-06-19 | 1977-09-08 | Technigraf GmbH, 6394 Grävenwiesbach | Kontaktkopiergeraet mit einem schwenkbaren kopierrahmen |
DE3144738C2 (de) * | 1981-11-11 | 1984-04-05 | Wilhelm Staub Gmbh, 6078 Neu-Isenburg | "Anlage zum Belichten von Druckplatten" |
DE3207903C2 (de) * | 1982-03-05 | 1985-07-18 | Wilhelm Staub Gmbh, 6078 Neu-Isenburg | Anlage zum Belichten von fotopolymeren Materialien |
EP0141868A1 (de) * | 1982-04-01 | 1985-05-22 | Inc. M & T Chemicals | Photomaskensatz mit hohem Auflösungsvermögen für die Herstellung von Photopolymerbildern |
WO1987002790A1 (en) * | 1985-10-25 | 1987-05-07 | M & T Chemicals Inc. | Device for aligning a photomask onto a printed wiring board |
DE3540107A1 (de) * | 1985-11-12 | 1987-05-14 | Klimsch & Co | Kontaktkopiergeraet fuer uv-empfindliches material |
EP0267600A2 (de) * | 1986-11-12 | 1988-05-18 | Asahi Kasei Kogyo Kabushiki Kaisha | Verfahren zur selektiven Härtung von flüssigen, lichtempfindlichen Kunststoffen durch Belichtung mittels einer Maske |
EP0367244A2 (de) * | 1988-10-31 | 1990-05-09 | Dainippon Screen Mfg. Co., Ltd. | Gerät zur Vakuumkontaktbelichtung eines Originalfilmbildes auf einem photoempfindlichem Material und Verfahren dazu |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2735717A1 (fr) * | 1995-06-22 | 1996-12-27 | Photomeca Egg | Procede de fabrication de plaques photopolymeres par double irradiation par le dessous |
Also Published As
Publication number | Publication date |
---|---|
DE3906179A1 (de) | 1990-08-30 |
EP0461169A1 (de) | 1991-12-18 |
AU5182490A (en) | 1990-09-26 |
NZ232688A (en) | 1991-07-26 |
CA2046862A1 (en) | 1990-08-29 |
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