GB1581232A - Printing roll with detachable sleeve and method of fitting that sleeve - Google Patents
Printing roll with detachable sleeve and method of fitting that sleeve Download PDFInfo
- Publication number
- GB1581232A GB1581232A GB60976A GB60976A GB1581232A GB 1581232 A GB1581232 A GB 1581232A GB 60976 A GB60976 A GB 60976A GB 60976 A GB60976 A GB 60976A GB 1581232 A GB1581232 A GB 1581232A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sleeve
- core
- diameter
- gas
- printing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/08—Cylinders
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Printing Plates And Materials Therefor (AREA)
Description
(54) PRINTING ROLL WITH DETACHABLE SLEEVE, AND METHOD OF
FITTING THAT SLEEVE
(71) We, DRG (UK) LIMITED, of 1
Redcliffe St, Bristol BS99 7QY, a British
Company, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to methods and means for manufacturing and mounting printing sleeves.
Printing sleeves which are mountable on and demountable from printing rolls are known in several forms of printing particularly flexography. The manner in which they may be mounted and demounted on the roll cores has caused problems and their manufacture in a manner which is compatible with mounting and demounting has also created considerable difficulty.
Examples of some ways which have been explored for allowing mounting and demounting of various types of sleeves or rolls, are seen in U.S. Patents 2117722, 2450727, 2501630 and 3035331. The last of these is of some interest in the present context since it shows the contraction of an outer surface of a printing roll core by the application of vacuum within it while an inextensible printing sleeve is fitted over it. When the vacuum is released, the core surface expands into the sleeve. Though this is conceptually elegant it does imply necessarily a compressible printing roll core, something which may be incompatible with good working results, and even if this problem were overcome the design of such a core from the point of view of allowing a sufficient vacuum passage volume would be a matter of great difficulty.
It is probably for these reasons that the application of positive gas pressure to expand the sleeve during the time that it is being fitted on or taken off a printing roll core was proposed in United States Patent 3146709 which was published in 1964.
There, the inventors had the general idea that air could be blown from the roll core outwardly so as to tend to expand the printing sleeve as it was fitted on it. However difficulty is encountered in the initial fitting of the sleeve since no expansion will take place until sufficient of the papertures through which air issues from the centre of the core have already been covered. Also, there will be a loss of efficiency in the process as a whole because of the loss of air through uncovered holes.
This same U.S. Patent 3146709 discloses a way of making a printing sleeve which consists of preparing a cylindrical body of a sheet of polyester plastics, taping it into a cylindrical form by a helical winding of an adhesive tape and then helically winding on the adhesive tape a double-sided adhesive tape known in the trade as "sticky-back". Then, a layer of rubber or rubber-like material is lapped around the cylindrical body and held by adhesion on the sticky-back. Indeed the rubber layer is referred to in that patent as a rubber plate. It will be realised that when such a compound sleeve is expanded by the effect of gas underneath it there is a tendency for leakage through adjacent edges of the sheet which can cause a blister or bubble to form under the attached plates.
To overcome the problem involved in the initial fitting of these prior art sleeves while at the same time avoiding the special and complex design problems encountered if the core is to be compressed for fitting the sleeve, there is provided a method of fitting a printing sleeve onto a roll core with an outer surface, of which one longitudinal end has a diameter greater than that of the other longitudinal end, and gas outlets in the outer surface remote from each longitudinal end, the printing sleeve having an inner surface designed to be an interference fit with the outer surface of the core at a designed working position, the method including moving the sleeve onto the core from the end of the core of lesser diameter with an end of the sleeve of greater internal diameter leading, until the sleeve and core touch around the inner circumference of the sleeve and the sleeve has covered all gas outlets in the core surface, applying gas under pressure inside the sleeve from the gas outlets in the outer surface of the core, to expand the sleeve radially, moving the sleeve while so expanded to its designed working position on the core, and ceasing to supply gas so that the sleeve makes the interference fit with the core in its working position.
The inner surface of the sleeve may be a taper configuration corresponding to a continuous taper of the outer surface of the roll, but the core outer surface may have a stepped transition between its ends of different diameter.
The printing sleeve may have been formed by coating a shell of fibre-reinforced plastics material such as polyester or epoxy resin with an uncured elastomer and curing the elastomer in situ.
To prepare the in-situ cured coating for use as a printing surface, known finishing and engraving processes may be used upon its rubber surface when the rubber is already vulcanised onto the shell. When the inner surface of the shell is tapered the outer surface of the shell may be cylindrical so that the shell is of varying thickness, or the shell may be of uniform thickness so that the rubber later, when its outer surface is trued, is of varying thickness. A flexible printing plate or plates may be adhesively secured to a cylindrical outer surface of the coating or of the shell, to provide the printing surface.
The invention also provides a detachable sleeve printing roll consisting of a core having an outer surface which has one longitudinal end of a diameter greater than that of its other longitudinal end and apertures serving as compressed gas outlets positioned remote from the ends of the core, and a sleeve forming under stress an interference fit with the outer surface of the core in its working position, one end of the sleeve having in its unstressed condition an internal diameter between the maximum external diameter of the core and the external diameter (or the maximum external diameter) of that portion of the core with gas outlets in its surface.
The change in diameter from one end to the other is progressive (i.e. only increases or only decreases according to the direction one is moving along the roll) but may be in the form of a taper, or of a stepped transition. If a conical taper is used, it is slight and a preferred taper is in the range of 5 parts in 10,000 to 5 parts in 20,000. The latter is most preferred. In such a taper, the diameter of the roll core changes by 0.00025 units per unit of axial length of the roll. If as is preferred the whole of the outer surface of the roll core has a conicity it can be seen that a properly prepared printing sleeve of which the shell has a corresponding internal conicity can be freely fitted by hand from one end of the roll core until it gets to a position at which the surfaces of the sleeve and roll touch. This is a certain distance from its designed working position.
Since the gas outlets are grouped away from the axial ends of the roll core, in this position it will cover all such outlets and then gas pressure may be applied to within the sleeve from within the core to expand the sleeve and enable it to be moved further along the roll to its designed working position upon this core.
To take a specific example, if the core is essentially 12 cm in diameter, the sleeve is undersize by 0.012 cm in its working position, and the taper of the core is 5 parts in 20,000, the position at which the sleeve and core touch will be approximately 48 cm from the working position. If the sleeve has been made as indicated above, the rubber of the sleeve has been bonded to the shell and has no seam so it will not be lifted or distorted by the application of this pressure, and there will be no gap through which radial leakage can occur.
The stepped embodiment has the main advantage that the stepped formation of the outer surface of the core is easier to manufacture than a frusto-conical surface.
In that embodiment a roll core of a printing roll has a radially outer surface having at least one stepped change in diameter between its ends and a gas outlet in the radial outer surface of lesser diameter and spaced from each end of the core. Gas outlets are preferably adjacent the stepped change in diameter.
The preferred relationship between such a core and its sleeve is that the height of the step between the regions of different diameter of the core is greater than the designed interference between the portion of the sleeve of greater diameter and the portion of the core of greater diameter. The result of this is that the portion of the sleeve of greater diameter may be passed freely over the portion of core of lesser diameter but will then positively abut against the axial face of the stepped discontinuity and diameter whereby to define a gas-containing enclosure between the sleeve and the core. Preferably also the axial length of the portion of the sleeve of greater diameter will correspond with the axial length of the portion of core of lesser diameter so that when the leading end of the sleeve abuts against the step, the complementary step within the sleeve will abut against the end of the core which is of lesser diameter, additionally to define that gascontaining enclosure.
Particular embodiments of the invention and particular methods according to the invention will now be described with refer ence to the accompanying drawings, wherein:
Fig. 1 is a diametrical section through a first embodiment of sleeve and core on the line I-I, Fig. 2,
Fig. 2 is a section on the line II-II, Fig. 1,
Fig. 3 is a section as Fig. 1, but showing the sleeve in an initial position,
Figs. 4 and 5 are sections like that of Fig. 1 but showing, respectively, alternative forms of sleeve, and
Figs. 6 and 7 are a section and a partial elevation/partial section respectively showing an assembled second embodiment and a stage in its assembly, analogous to the stages seen in Figs. 1 and 3.
Referring first to Fig. 1, a printing sleeve 1 consists of a radially inner shell 2 surrounded by a rubber layer 3, on an outer surface 4 of which relief may be formed for printing purposes. A radially inner surface 5 of the shell has a progressive change in diameter as between its ends, in this case having a slight frusto-conical taper (much exaggerated in the drawing). A taper of the order of 0.00025 units (e.g. inch or cm) of change in diameter per 1 unit of axial length is suitable. The shell 2 is of constant radial thickness and its radially outer surface 16 has the same taper as the inner surface 5; in modifications the outer surface 16 could be cylindrical or could be tapered but of a taper different from that of the inner surface 5. The printing surface 4 is, of course, a true cylinder.
Fig. 1 shows the printing sleeve 1 in its working position (i.e. axially central along) on the working length of a printing roll core 6. The core 6 is hollow, having an incompressible hollow metal tube 7 supported at each end by axled roll ends 8,9. One core end 9 has a gas line connector 10 through which gas under pressure may be introduced to ducting 13 inside the volume enclosed by the tube 7 and ends 8,9. Gas can only escape from this radially through radial ports 18 in a block 17 which lead to outlets 12 circumferentially spaced apart around the core in a plane remote from both axial ends of the working length of the core, and preferably in the region of the middle of the axial length of the core 6. The region where the outlets 12 are has a maximum outer diameter of d3. The radially outer surface 11 of the tube 7 is given a progressive change in diameter between its ends complementary to that of the surface 5 of the shell 2 of the printing sleeve 1 so that one end has a diameter dl and the other end has a diameter d4; d, is greater than d3 and d3 is greater than d4, and in this case there is a continuous taper between them.
To form the printing sleeve, a fibre reinforced resin such as a glass reinforced polyester (GRP) or glass reinforced epoxy resin is laid-up on a former having a desired taper, to a depth of approx. 1/16" (approx. 1.5 mm).
The layer is of uniform thickness so that its outer surface has the same taper as its inner surface. It is allowed to harden to form the seamless shell 2 and a coating of uncured rubber (the term including, of course, synthetic rubbers and other suitable elastomers) is applied to the outer surface. The rubber is cured in situ and thereby is hardened as a complete, gapless, seamless, tube 3 simply bonded to the shell 2. When as in the preferred embodiments the taper is as low as 5 parts in 20,000, a uniform thickness shell may all the more readily be used since the difference in radial thickness in the rubber layer along the length of the core (the outer surface of the rubber layer being brought to a true cylinder, of course) is negligible in its effect. The outer surface of the rubber is then ground true and engraved or otherwise prepared for printing. Alternatively as indicated in Fig. 5, the outer surface 4' of the rubber layer may be ground to a true cylinder after curing, and used as a base to which a flexible printing plate or plates (also known as sheet or sheets such as stereos 15 are secured by adhesion by the use, for example, of "sticky-back".
Although the preparation of a constant thickness shell 2 is preferred since its layingup is a simple matter, it is possible to lay-up a shell of varying thickness, to yield either a shell with a taper at its outer surface 16 different fromthat of the inner surface, or one with a true cylindrical outer surface.
In Fig. 4 the latter is shown. A shell 2' is laid-up as before, but so as to give a cylindrical outer surface 16'. After curing of the
GRP, this is ground true and flexible plate(s) such as stereos 15 may be adhered direct to the surface 16' by means of "sticky-back".
It is apparent that, at least as far as the steps of making the sleeve itself are concerned they are applicable also to the making of seamless sleeves with a cylindrical internal surface.
The following discussion of fitting procedures will for brevity be given using the reference numbers seen in Figs. 1 and 3 but it is of completely equal applicability to the embodiments of sleeve seen in Figs. 4 and 5.
The former on which the shell is laid-up is diametrically undersize relative to the printing roll core 6 on which the sleeve is to be fitted, so that the sleeve when formed will have a greatest diameter greater than the least diameter of the core but less than its greatest diameter and will be able to be passed freely along the core in the direction of the arrow A, Fig. 3, only for part of the length of the core. A major part, say 3/4, is preferred. Then, the inner circumference of at least the leading end 14, of which the unexpanded inner diameter is d2 ( dl > d2 > d3) touches all round on the core and wedges against it.
This condition is seen in full lines in Fig. 3. To bring the sleeve 1 to the working position it is expanded by means of gas passed through outlets 12 (all of which are at that stage covered by the sleeve) and pressed further in the direction of the arrow A to its working position 1' in Fig. 3, or as it is seen in full lines in Figure 1. Because of the undersize of the sleeve 1 and the only very slight taper given to the surfaces 5 and 11, when the gas pressure is vented to the atmosphere the sleeve will hold itself ifrmly in stressed condition on the core in its working position, ready for use.
Because of the taper of the surfaces and the positioning of the gas outlets, gas pressure need not be applied during the initial positioning of the sleeve 1 on the core 6 but only after all outlets 12 have been covered by the sleeve 1. Although it is preferred that the surfaces 5, 11 shall be continuously and constantly tapered, at least some of the advantages of the invention will be obtained when only a portion of the surface 11 of the core is tapered, preferably a major portion at the end which is last covered by the sleeve during the fitting process.
The second embodiment will now be described with reference to Figs. 6 and 7.
These Figures show a roll core 20 including a hollow cylinder 21 having an internal surface 22 which is a cylinder of constant diameter and an external surface of which one end portion 23 has a lesser diameter than the other longitudinal end portion 24 The smaller diameter portion 23 has a diameter d4 and the larger diameter portion 24 has a diameter dl and they meet at a stepped discontinuity 25 having a planar axial face, the radial height of the step being i (dl - d4). As in the previous embodiment, ends of the roll core are defined by axle roll ends 8,19, the end 19 having a gas line connector 10 through which gas under pressure may be introduced to ducting 13 within the volume enclosed by the cylinder 21 and ends 8,19.
Ducting 13 conducts gas to a block 17 containing radial ports 18, which lead to outlets 12 spaced around the circumference of the core in the portion of lesser diameter d4 and adjacent to the step 25.
A seamless printing sleeve 30 is formed by any of the methods described above but so as to have not a continuous taper on its inner surface as was there disclosed, but stepped discontinuity 31 complementary to step 25 and at a position such that when this is facially abutted against the step 25 the working position of the sleeve upon the core will be defined. The position of the steps 25,31 is also such that the axial length a (Fig. 7) of the portion 23 of lesser diameter of the core is equal to the axial length of an end portion 32 of the sleeve 30 which has an inner surface 33 of greater diameter.
The other end portion 34 of the sleeve 30 has an internal surface 35. The diameter of the surface 33 will be designated d5 and that of surface 35 as d6.
The sleeve is designed to have a designed interference fit, i.e. to be a predetermined amount undersize in comparison to the core when the sleeve is in unstressed condition. It is the relaxation of the sleeve towards that unstressed condition, after it has been expanded and placed in its working position, which retains it in its working position on the core. It is preferred to make the difference between dl and d4 slightly greater than the designed undersize of sleeve on the core or in other words that d1 shall be very slightly greater than d5. This means that when as seen in
Fig. 2 the leading end 36 of the sleeve has been passed over the portion 23 of the core it will abut against the planar annular face of the step 25 over a thin area of contact 37 whereby to define one end of a gas containing volume 38 between the sleeve and the core. Similarly the step transition 31 in the inner surface of the sleeve will abut against the end face of the core at a very narrow line interface 39 to define the other end of that gas-containing volume. Then, gas is introduced under pressure through the outlets 12 into that volume to expand the sleeve which can then be moved into position over the core, gas escaping from the chamber 38 through the narrow leak path defined between the (expanded) surface 35 and the surface of core portion 23 on the one hand and the (expanded) surface 33 and the surface of core portion 24 on the other hand.
As mentioned this embodiment is easier to manufacture than the previously described one.
The extent of the height of the steps 31,25 has been much exaggerated in the drawings, for the sake of clarity and it may be, as has been described, very slightly greater than the designed undersize of the sleeve on the core.
Typically such a designed diametrical undersize would be 0.006 inch, with the difference in diameter dl-d4 then being 0.008 inch.
It is apparent that a sleeve of either embodiment may readily and nondestructively be removed from its core by expansion in its working position and then being slid axially off the core.
WHAT WE CLAIM IS:
1. A method of fitting a printing sleeve onto a roll core with an outer surface, of which one longitudinal end has a diameter greater than that of the other longitudinal end, and gas outlets in the outer surface remote from each longitudinal end, the printing sleeve having an inner surface designed to be an interference fit with the outer surface of the core at a designed working position, the method including moving the sleeve onto the core from the end of the core of lesser diameter with an end of the sleeve of
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (17)
1. A method of fitting a printing sleeve onto a roll core with an outer surface, of which one longitudinal end has a diameter greater than that of the other longitudinal end, and gas outlets in the outer surface remote from each longitudinal end, the printing sleeve having an inner surface designed to be an interference fit with the outer surface of the core at a designed working position, the method including moving the sleeve onto the core from the end of the core of lesser diameter with an end of the sleeve of
greater internal diameter leading, until the sleeve and core touch around the inner circumference of the sleeve and the sleeve has covered all gas outlets in the core surface, applying gas under pressure inside the sleeve from the gas outlets in the outer surface of the core to expand the sleeve radially, moving the sleeve while so expanded to its designed working position on the core, and ceasing to supply gas so that the sleeve makes the interference fit with the core in its working position.
2. A method according to Claim 1 in which the sleeve is prepared by coating a shell of fibre reinforced plastics material with an uncured elastomer and curing the elastomer in situ.
3. A method according to Claim 2 or
Claim 3 in which the elastomer provides the printing surface of the sleeve.
4. A method according to Claim 2 or
Claim 3 in which a flexible printing plate is secured by adhesion to the cured elastomer.
5. A method according to Claim 1 in which the sleeve is prepared by directly adhering a flexible printing plate to a shell of fibre reinforced plastics material.
6. A detachable sleeve printing roll consisting of a core having an outer surface which has one longitudinal end of a diameter greater than that of its other longitudinal end and apertures serving as compressed gas outlets positioned remote from the ends of the core, and a sleeve forming under stress an interference fit with the outer surface of the core in its working position, one end of the sleeve having in its unstressed condition an internal diameter between the maximum external diameter of the core and the external diameter (or the maximum external diameter) of that portion of the core with gas outlets in its surface.
7. A printing roll according to Claim 6 in which the outer surface of the core and the inner surface of the sleeve are uniformly and mutually correspondingly and continuously tapered along their entire axial lengths.
8. A printing roll according to Claim 7 in which the degree of taper is in the range from 5 parts in 10,000 to 5 parts in 20,000.
9. A printing roll according to Claim 8 in which the degree of taper is substantially 5 parts in 20,000.
10. A printing roll according to Claim 6 wherein the core has a step transition in the outer surface between the ends of different diameter.
11. A printing roll according to Claim 10 wherein the difference in diameters forming the step is greater than the designed undersize of the sleeve with respect to the end of the core of greater diameter.
12. A printing roll according to any one of Claims 6 to 11 in which the sleeve includes a radially inner seamless shell of reinforced plastics material.
13. A printing roll according to Claim 12 in which the inner shell is of substantially uniform thickness so that the radially outer surface of the shell has the same degree of taper as the radially inner surface.
14. A printing roll according to Claim 12 in which the readially outer surface of the inner shell is substantially cylindrical.
15. A printing roll according to any of
Claims 6 to 14 in which there is provided ducting within the core for conveying gas under pressure to the gas outlets.
16. A printing roll accordingtoany one of Claims 6 to 15 substantially as herein described with reference to the accompanying drawings.
17. A method according to any of Claims 1 to 5 substantially as herein described with reference to the accompanying drawings.
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB60976A GB1581232A (en) | 1976-01-08 | 1976-01-08 | Printing roll with detachable sleeve and method of fitting that sleeve |
IN2260/CAL/76A IN146438B (en) | 1976-01-08 | 1976-12-24 | |
US05/755,757 US4144813A (en) | 1976-01-08 | 1976-12-30 | Printing sleeves |
DE19772700118 DE2700118A1 (en) | 1976-01-08 | 1977-01-04 | PRINT ROLLER |
JP52001114A JPS5849187B2 (en) | 1976-01-08 | 1977-01-07 | Printing machine plate roll and method of assembling the plate roll |
ES454855A ES454855A1 (en) | 1976-01-08 | 1977-01-07 | Printing sleeves |
MX167631A MX144902A (en) | 1976-01-08 | 1977-01-07 | IMPROVEMENTS IN PRINT ROLLER AND METHOD FOR MOUNTING A SLEEVE ON THE NUCLEUS OF THE SAID ROLLER |
IT19110/77A IT1085905B (en) | 1976-01-08 | 1977-01-07 | PRINTER ROLLER AND PROCESS FOR ITS MANUFACTURE |
US05/802,722 US4144812A (en) | 1975-01-08 | 1977-06-02 | Printing sleeves |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB60976A GB1581232A (en) | 1976-01-08 | 1976-01-08 | Printing roll with detachable sleeve and method of fitting that sleeve |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1581232A true GB1581232A (en) | 1980-12-10 |
Family
ID=9707381
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB60976A Expired GB1581232A (en) | 1975-01-08 | 1976-01-08 | Printing roll with detachable sleeve and method of fitting that sleeve |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1581232A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0127953A2 (en) * | 1983-05-05 | 1984-12-12 | Drg (Uk) Limited | Improvements in or relating to a printing roll with a detachable sleeve |
US5216954A (en) * | 1991-10-24 | 1993-06-08 | Thompson William L | Multi-section mountable sleeves and methods for mounting and dismounting same |
DE4303381A1 (en) * | 1993-02-05 | 1994-12-01 | Roland Man Druckmasch | Plate cylinder with a device for lifting a printing plate |
GB2284574A (en) * | 1993-12-10 | 1995-06-14 | Roland Man Druckmasch | Forme cylinder for sleeve-shaped printing forme |
DE19804269A1 (en) * | 1998-02-04 | 1999-08-05 | Heidelberger Druckmasch Ag | Device for applying a liquid to a printing material sheet, in particular printing, or coating unit, in a sheet-fed rotary printing machine |
CN109733085A (en) * | 2019-02-15 | 2019-05-10 | 蒋佗贤 | Stamp is used or the processing technology of the seamless rubber bush version of flexo |
CN114103433A (en) * | 2021-12-16 | 2022-03-01 | 浙江炜冈科技股份有限公司 | Automatic locking and positioning device for sleeve type plate cylinder of offset press |
-
1976
- 1976-01-08 GB GB60976A patent/GB1581232A/en not_active Expired
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0127953A2 (en) * | 1983-05-05 | 1984-12-12 | Drg (Uk) Limited | Improvements in or relating to a printing roll with a detachable sleeve |
EP0127953A3 (en) * | 1983-05-05 | 1986-02-12 | Drg (Uk) Limited | Improvements in or relating to a printing roll with a detachable sleeve |
US5216954A (en) * | 1991-10-24 | 1993-06-08 | Thompson William L | Multi-section mountable sleeves and methods for mounting and dismounting same |
DE4303381A1 (en) * | 1993-02-05 | 1994-12-01 | Roland Man Druckmasch | Plate cylinder with a device for lifting a printing plate |
GB2284574A (en) * | 1993-12-10 | 1995-06-14 | Roland Man Druckmasch | Forme cylinder for sleeve-shaped printing forme |
US5513568A (en) * | 1993-12-10 | 1996-05-07 | Man Roland Druckmaschinen Ag | Plate cylinder for a sleeve-type printform |
GB2284574B (en) * | 1993-12-10 | 1997-05-14 | Roland Man Druckmasch | Forme cylinder for a sleeve-shaped printing forme |
DE19804269A1 (en) * | 1998-02-04 | 1999-08-05 | Heidelberger Druckmasch Ag | Device for applying a liquid to a printing material sheet, in particular printing, or coating unit, in a sheet-fed rotary printing machine |
CN109733085A (en) * | 2019-02-15 | 2019-05-10 | 蒋佗贤 | Stamp is used or the processing technology of the seamless rubber bush version of flexo |
CN114103433A (en) * | 2021-12-16 | 2022-03-01 | 浙江炜冈科技股份有限公司 | Automatic locking and positioning device for sleeve type plate cylinder of offset press |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
746B | Proceeding under section 46(3) patents act 1977 | ||
PE20 | Patent expired after termination of 20 years |
Effective date: 19970404 |