CA1115125A - Printing sleeve - Google Patents
Printing sleeveInfo
- Publication number
- CA1115125A CA1115125A CA281,864A CA281864A CA1115125A CA 1115125 A CA1115125 A CA 1115125A CA 281864 A CA281864 A CA 281864A CA 1115125 A CA1115125 A CA 1115125A
- Authority
- CA
- Canada
- Prior art keywords
- core
- sleeve
- diameter
- printing
- printing roll
- 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
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N1/00—Printing plates or foils; Materials therefor
- B41N1/16—Curved printing plates, especially cylinders
- B41N1/22—Curved printing plates, especially cylinders made of other substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/18—Curved printing formes or printing cylinders
- B41C1/182—Sleeves; Endless belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F27/00—Devices for attaching printing elements or formes to supports
- B41F27/10—Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders
- B41F27/105—Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders for attaching cylindrical printing formes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising
- B41N6/02—Chemical means for fastening printing formes on mounting boards
Abstract
ABSTRACT OF THE DISCLOSURE
For fitting a printing sleeve in a printing roll the outer surface of the roll core and preferably the inner surface of the sleeve are made with one end of a lesser diameter than the other; the sleeve is slightly undersize diametrically. Remote from the ends of the core are orifices whereby gas under pressure may be blown radially outwardly from the core. The difference in diameter allows the sleeve to be passed freely along the core until it jams up against an increased diameter portion of the outer surface of the roll, at which time it covers the orifices. Gas is then blown from the orifices to expand the sleeve which can then be moved into its working position on the core.
A sleeve specially suitable for this treatment is made by laying-up a seamless GRP layer on a former which is undersize for the designed core and either curing a rubber layer in situ onto the layer, or adhesively securing a flexible plate to a true cylindrical outer surface of the GRP layer.
A transition between the regions of different diameter of the outer surface of the roll core may be made by a frusto-conical taper (preferably of the order of 5 parts in 10,000 to 20,000) or by at least one step (preferably slightly greater than the designed undersize of the sleeve, say 0.008 and 0.006 inches respectively).
For fitting a printing sleeve in a printing roll the outer surface of the roll core and preferably the inner surface of the sleeve are made with one end of a lesser diameter than the other; the sleeve is slightly undersize diametrically. Remote from the ends of the core are orifices whereby gas under pressure may be blown radially outwardly from the core. The difference in diameter allows the sleeve to be passed freely along the core until it jams up against an increased diameter portion of the outer surface of the roll, at which time it covers the orifices. Gas is then blown from the orifices to expand the sleeve which can then be moved into its working position on the core.
A sleeve specially suitable for this treatment is made by laying-up a seamless GRP layer on a former which is undersize for the designed core and either curing a rubber layer in situ onto the layer, or adhesively securing a flexible plate to a true cylindrical outer surface of the GRP layer.
A transition between the regions of different diameter of the outer surface of the roll core may be made by a frusto-conical taper (preferably of the order of 5 parts in 10,000 to 20,000) or by at least one step (preferably slightly greater than the designed undersize of the sleeve, say 0.008 and 0.006 inches respectively).
Description
512~
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.
Various ways have been explored for allowing mounting and demounting of various types of sleeves or rolls, including 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 tnis 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.
~,t~
, a~
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.
Various ways have been explored for allowing mounting and demounting of various types of sleeves or rolls, including 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 tnis 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.
~,t~
, a~
-2-It is probably for these reasons that the application of positive gas pressure to expand the sleeve during tne time that it is being fitted on or taken off a printing roll core was proposed in United States Patent 3,146,709, issued September 1, 1964 to ~aldo E. Bass and ~ohn F. Kirby. 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 apertures 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 United States Patent 3,146,7Q9 discloses a way of making a printing sleeve which consists of pre-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 2a 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 i5 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.
.
. .
f~
. .;~
.
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 itting the sleeve, there is provided a method of fitting a printing sleeve to a printing roll which consists of preparing a roll core with an outer surface of which one longitudinal end has a diameter greater than that of the other longitudinal end andla printing sleeve with an inner surface designed to be an interference fit with the o~ter surface of the core at a designed working position, moving the sleeve onto the core from the end of the core of lesser diameter with an end of the sleeve of greater dia~eter 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 said gas outlets to expand the sleeve radially and moving the sleeve while so expanded to its designed working position on the core.
The inner surface of the sleeve is preferably of a taper configuration corresponding totthat of the outer surface of the roll, but the one outer surface may have a stepped transition between its ends of different diameter.
m e method also comprises forming the printing sleeve by coating a shell offibra~-reinforced polyester or epoxy resin with an uncured rubber and curing the rubber in situ to provide a printing surface of the sleeve.
. .
.. . . .
:. ..
.
:
7; ~
Also in the invention there is provided a printing sleeve which consists of a fibre reinforced polyester or expoxy resin shell, of which the radially inner surface has a different diameter at one end than at its other, on an outer and cylindrical surface of which sleeve is a printing surface.
The sleeve may include a rubber coating, cured in situ on the shell. To prepare the coating for printing, known finishing and engraving processes may be used upon its rubber surface when, the rubber is already vulcanized onto the shell. ~hen 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 layer, 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 has 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, at least 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 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 approx-imately 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 ~i~s~z5 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.
In this respect, the present invention also provides a printing sleeve capable of being fitted under internal gas pressure to a roll core which sleeve has an inner surface with at least one stepped portion and is capable of being expanded by gas pressure inside the sleeve so as to pass onto a corresponding stepped printing roll core with which it is a designed interference fit.
The preferred relationship between the core and the roll 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 encloqure .'.`
' .
~5~
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 gas-containing enclosure.
In accordance with the present invention, there is provided a method of fitting a printing sleeve to a printing : 10 roll which consists of taking i) a roll core of a working length, an outer surface of which has one longitudinal end of a diameter greater than that of the other longitudinal end and gas outlets spaced from each said end of the working length - between them and ii) a printing sleeve of the said working length with an inner surface designed to be an interference fit with the outer surface of the core at a designed working posi-tion, moving the sleeve onto the core from the end of the core of lesser diameter with an end of the sleeve of greater diameter leading, until the sleeve and core touch around the inner circum-, 20 ference of the sleeve and the sleeve has covered all gas outlets - in the core surface, applying gas under pressure inside the ; sleeve from the said gas outlets to expand the sleeve radially and moving the sleeve while so expanded to its designed working position on the core.
In accordance with the present invention, there is also provided 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 has apertures serving as compressed gas outlets positioned in a region of the core 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, at least one end `~i ^` 1$1~
:
of the sleeve having in its unstressed condition an internal diameter between the maximum external diameter of the core and the external diameter of that region of the core with gas out-lets in its surface.
In accordance with the present invention, there is also provided a printing sleeve adapted for interference fitting with a printing roll core having an outer surface which has one longitudinal end of a diameter greater than that of its other :. longitudinal end and has apertures serving as compressed gas outlets positioned remote from the ends of the core, said sleeve havingatatleast oneend thereof an internal diameter in its .: unstressed condition between the maximum external diameter of :`
the core and the external diameter of that portion of the core with gas outlets in its surface.
Particular embodiments of the invention and part cular methods according to the invention will now be described with . reference to the accompanying drawings, wherein:-` Figure 1 is a diametrical section through a first embodiment of sleeve and core on the line I-I, Figure 2, Figure 2 is a section on the line II-II, Figure 1, Figure 3 is a section as Figure 1, but showing the ` sleeve in an initial position, Figures 4 and 5 are sections like that of Figure 1 but showing, respectively, alternative forms of sleeve, and . Figures 6 and 7 are a section and a partial elevation/
partial section respectively showing an assembled second embodi-ment and a stage in its assembly, analogous to the stages seen in Figures 1 and 3.
Referring first to Figure 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 - 8a -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 exag-gerated 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 differ-ent from that of the inner surface 5. The printing surface4 is, of course, a true cylinder.
Figure 1 shows the printing sleeve 1 in its working position (i.e. axially central along) a printing roll core 6.
The core 6 is hollow, having an incompressible hollow metal tube 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 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 an 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; dl is greater than d3 and d3 is greater than d4, and in this case there is a continuous taper between them.
-8b-~s~s To form the printing sleeve, a fibre reinforced resin such as a glass reinforced polyester or glass reinforced epoxy resin is laid-up on a former having a desired taper, to a depth of approximately 1/16" (approximately 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 in-cluding, 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. Alter-natively as indicated in Figure 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 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 laying-up 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 from that of the inner surface, or one with a true cylindrical outer surface.
~n F-igure 4 the latter is shown. A shell 2' is laid-up :
:
_ g _ ~ 515~
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 Figures 1 and 3 but it is of completely equal applicability to the embodiments of sleeve seen in Figures 4 and 5.
The former on which the shell is laid-up is diametrically undersize relative to the printing roll 6 on which the sleeve is to be fitted, so that the sleeve when formed will have the 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, Figure 3, only for part of the length of the core.
A major part, say 3/4, is preferred. Then, the inner circum-ference 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 Figure 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 Figure 3, or as it is seen in full lines in Figure 1. Because of the undersize of the sleeve 1 and the only yery slight taper given to the surfaces 5 and 11, when the . . -- 10 --~ S~
gas pressure is vented to the atmospherethe sleeve will hold itself firmly in stressed condition on the core in its working position, ready for use.
Because of the taper of the surfaces and the position-ing 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 - 10 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 Figures 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 d1 and - they meet at a stepped discontinuity 25 having a planar axial . face, the radial height of the step being 1/2 (dl - d4). As in the previous embodiment, ends of.the roll core are defined by axle roll ends 8, 9, the end 9 having a gas line connector 10 through which gas under pressure may be introduced to duct-ing 13 within the volume enclosed by the cylinder 21 and ends 8, 9.
: 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 ~5~L25 and adjacent to the step 25.
A seamless printing sleeve 30 is formed by any of the methods previously disclosed but so as to have not a contin-uous 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 (Figure 2) 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 dl shall be very slightly greater than d5. This means that when as seen in Figure 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 39 through the narrow leak path de-fined 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.
; 10 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.
:
; - 13 -
This same United States Patent 3,146,7Q9 discloses a way of making a printing sleeve which consists of pre-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 2a 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 i5 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.
.
. .
f~
. .;~
.
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 itting the sleeve, there is provided a method of fitting a printing sleeve to a printing roll which consists of preparing a roll core with an outer surface of which one longitudinal end has a diameter greater than that of the other longitudinal end andla printing sleeve with an inner surface designed to be an interference fit with the o~ter surface of the core at a designed working position, moving the sleeve onto the core from the end of the core of lesser diameter with an end of the sleeve of greater dia~eter 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 said gas outlets to expand the sleeve radially and moving the sleeve while so expanded to its designed working position on the core.
The inner surface of the sleeve is preferably of a taper configuration corresponding totthat of the outer surface of the roll, but the one outer surface may have a stepped transition between its ends of different diameter.
m e method also comprises forming the printing sleeve by coating a shell offibra~-reinforced polyester or epoxy resin with an uncured rubber and curing the rubber in situ to provide a printing surface of the sleeve.
. .
.. . . .
:. ..
.
:
7; ~
Also in the invention there is provided a printing sleeve which consists of a fibre reinforced polyester or expoxy resin shell, of which the radially inner surface has a different diameter at one end than at its other, on an outer and cylindrical surface of which sleeve is a printing surface.
The sleeve may include a rubber coating, cured in situ on the shell. To prepare the coating for printing, known finishing and engraving processes may be used upon its rubber surface when, the rubber is already vulcanized onto the shell. ~hen 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 layer, 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 has 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, at least 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 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 approx-imately 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 ~i~s~z5 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.
In this respect, the present invention also provides a printing sleeve capable of being fitted under internal gas pressure to a roll core which sleeve has an inner surface with at least one stepped portion and is capable of being expanded by gas pressure inside the sleeve so as to pass onto a corresponding stepped printing roll core with which it is a designed interference fit.
The preferred relationship between the core and the roll 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 encloqure .'.`
' .
~5~
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 gas-containing enclosure.
In accordance with the present invention, there is provided a method of fitting a printing sleeve to a printing : 10 roll which consists of taking i) a roll core of a working length, an outer surface of which has one longitudinal end of a diameter greater than that of the other longitudinal end and gas outlets spaced from each said end of the working length - between them and ii) a printing sleeve of the said working length with an inner surface designed to be an interference fit with the outer surface of the core at a designed working posi-tion, moving the sleeve onto the core from the end of the core of lesser diameter with an end of the sleeve of greater diameter leading, until the sleeve and core touch around the inner circum-, 20 ference of the sleeve and the sleeve has covered all gas outlets - in the core surface, applying gas under pressure inside the ; sleeve from the said gas outlets to expand the sleeve radially and moving the sleeve while so expanded to its designed working position on the core.
In accordance with the present invention, there is also provided 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 has apertures serving as compressed gas outlets positioned in a region of the core 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, at least one end `~i ^` 1$1~
:
of the sleeve having in its unstressed condition an internal diameter between the maximum external diameter of the core and the external diameter of that region of the core with gas out-lets in its surface.
In accordance with the present invention, there is also provided a printing sleeve adapted for interference fitting with a printing roll core having an outer surface which has one longitudinal end of a diameter greater than that of its other :. longitudinal end and has apertures serving as compressed gas outlets positioned remote from the ends of the core, said sleeve havingatatleast oneend thereof an internal diameter in its .: unstressed condition between the maximum external diameter of :`
the core and the external diameter of that portion of the core with gas outlets in its surface.
Particular embodiments of the invention and part cular methods according to the invention will now be described with . reference to the accompanying drawings, wherein:-` Figure 1 is a diametrical section through a first embodiment of sleeve and core on the line I-I, Figure 2, Figure 2 is a section on the line II-II, Figure 1, Figure 3 is a section as Figure 1, but showing the ` sleeve in an initial position, Figures 4 and 5 are sections like that of Figure 1 but showing, respectively, alternative forms of sleeve, and . Figures 6 and 7 are a section and a partial elevation/
partial section respectively showing an assembled second embodi-ment and a stage in its assembly, analogous to the stages seen in Figures 1 and 3.
Referring first to Figure 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 - 8a -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 exag-gerated 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 differ-ent from that of the inner surface 5. The printing surface4 is, of course, a true cylinder.
Figure 1 shows the printing sleeve 1 in its working position (i.e. axially central along) a printing roll core 6.
The core 6 is hollow, having an incompressible hollow metal tube 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 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 an 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; dl is greater than d3 and d3 is greater than d4, and in this case there is a continuous taper between them.
-8b-~s~s To form the printing sleeve, a fibre reinforced resin such as a glass reinforced polyester or glass reinforced epoxy resin is laid-up on a former having a desired taper, to a depth of approximately 1/16" (approximately 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 in-cluding, 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. Alter-natively as indicated in Figure 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 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 laying-up 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 from that of the inner surface, or one with a true cylindrical outer surface.
~n F-igure 4 the latter is shown. A shell 2' is laid-up :
:
_ g _ ~ 515~
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 Figures 1 and 3 but it is of completely equal applicability to the embodiments of sleeve seen in Figures 4 and 5.
The former on which the shell is laid-up is diametrically undersize relative to the printing roll 6 on which the sleeve is to be fitted, so that the sleeve when formed will have the 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, Figure 3, only for part of the length of the core.
A major part, say 3/4, is preferred. Then, the inner circum-ference 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 Figure 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 Figure 3, or as it is seen in full lines in Figure 1. Because of the undersize of the sleeve 1 and the only yery slight taper given to the surfaces 5 and 11, when the . . -- 10 --~ S~
gas pressure is vented to the atmospherethe sleeve will hold itself firmly in stressed condition on the core in its working position, ready for use.
Because of the taper of the surfaces and the position-ing 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 - 10 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 Figures 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 d1 and - they meet at a stepped discontinuity 25 having a planar axial . face, the radial height of the step being 1/2 (dl - d4). As in the previous embodiment, ends of.the roll core are defined by axle roll ends 8, 9, the end 9 having a gas line connector 10 through which gas under pressure may be introduced to duct-ing 13 within the volume enclosed by the cylinder 21 and ends 8, 9.
: 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 ~5~L25 and adjacent to the step 25.
A seamless printing sleeve 30 is formed by any of the methods previously disclosed but so as to have not a contin-uous 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 (Figure 2) 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 dl shall be very slightly greater than d5. This means that when as seen in Figure 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 39 through the narrow leak path de-fined 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.
; 10 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.
:
; - 13 -
Claims (33)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of fitting a printing sleeve to a printing roll which consists of taking i) a roll core of a working length, an outer surface of which has one longitudinal end of a diameter greater than that of the other longitudinal end and gas outlets spaced from each said end of the working length between them and ii) a printing sleeve of the said working length with an inner surface designed to be an interference fit with the outer surface of the core at a designed working position, moving the sleeve onto the core from the end of the core of lesser diameter with an end of the sleeve of greater 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 said gas outlets to expand the sleeve radially and moving the sleeve while so expanded to its designed working position on the core.
2. A method according to claim 1 in which the sleeve is pre-pared 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 1 or claim 2 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 sheet is secured by adhesion to the elastomer.
5. A method according to claim 1 in which the sleeve is prepared by directly adhering a flexible printing sheet 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 has apertures serving as compressed gas outlets positioned in a region of the core 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, at least 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 of that region of the core with gas out-lets 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 height of the step is greater than the designed undersize of the sleeve on the end of the core of greater diameter.
12. A printing roll according to claim 6 in which the sleeve includes a radially inner seamless shell of reinforced plastics material.
13. A printing roll according to claim 7 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 radially outer surface of the inner shell is substantially cylindrical.
15. A printing roll according to any of claims 6, 7 or 10 in which there is provided ducting within a hollow said core for con-veying gas under pressure to the gas outlets.
16. A printing roll comprising:
(i) an incompressible core having two axial ends at the end portions of the core, an outer surface of the core having a work-ing length extending between and up to each of the said ends and adapted to receive and support an expansible printing sleeve, the surface of the core having end portions of which the respective diameters are different whereby the working length of the outer surface has a minimum diameter and a maximum diameter, gas outlets in the outer surface said outlets being located in the working length of the outer surface on the side of the circumference of interference having the lesser diameter between the sleeve and the core wherein the said circumference of interference is the circumferential line on the core located at that location on the core beyond which one end of the sleeve, when slid on the core from the end of minimum diameter thereof cannot be moved towards the end of maximum diameter of the core without expansion of the sleeve, means for passing gas under pressure to said outlets to pass radially outwardly from them and the said sleeve being (ii) a seamless sleeve the sleeve being diametrically undersize for the core when in unstressed condition, the sleeve having two axial ends, at least the said one of said ends having in an unstressed condition an internal diameter greater than the said minimum diameter and less than the said maximum diameter of the outer surface of the core.
(i) an incompressible core having two axial ends at the end portions of the core, an outer surface of the core having a work-ing length extending between and up to each of the said ends and adapted to receive and support an expansible printing sleeve, the surface of the core having end portions of which the respective diameters are different whereby the working length of the outer surface has a minimum diameter and a maximum diameter, gas outlets in the outer surface said outlets being located in the working length of the outer surface on the side of the circumference of interference having the lesser diameter between the sleeve and the core wherein the said circumference of interference is the circumferential line on the core located at that location on the core beyond which one end of the sleeve, when slid on the core from the end of minimum diameter thereof cannot be moved towards the end of maximum diameter of the core without expansion of the sleeve, means for passing gas under pressure to said outlets to pass radially outwardly from them and the said sleeve being (ii) a seamless sleeve the sleeve being diametrically undersize for the core when in unstressed condition, the sleeve having two axial ends, at least the said one of said ends having in an unstressed condition an internal diameter greater than the said minimum diameter and less than the said maximum diameter of the outer surface of the core.
17. In a method of mounting an undersize printing sleeve in its working position on a printing roll core by the expansion of the sleeve by gas under elevated pressure passed outwardly from the radially outer surface of the core to allow movement of the sleeve along the core, the improvement comprising passing the sleeve freely and without expansion over that substantial portion of a radially outer surface of the core which is of less than a predetermined diameter until it covers all gas outlets in the outer surface, said gas outlets in the outer surface being located in the working length of the outer surface on the side of the circumference of interference having the lesser diameter between the sleeve and the core, wherein the said circumference of interference is the circumferential line on the core located at that location on the core beyond which the sleeve, when slid on the core from one end thereof cannot be moved towards the other end of the core without expansion of the sleeve, then passing the gas under elevated pressure out of the outlets to expand the sleeve radially and moving the sleeve to its working position.
18. In a printing roll comprising an incompressible roll core having a working length and an expansible sleeve surrounding the core removably mounted on it in a working position by an interference fit with the outer surface of the core and having means in the core for passing gas under elevated pressure outwardly from its outer surface to expand the sleeve the improvement comprising one axial end of the outer surface of the working length of the core being a diameter less than the unexpanded inside diameter of at least one end of the sleeve and the other axial end of the outer surface of the working length of the core being of a diameter greater than the unexpanded inside diameter of the said one end of the sleeve, said gas passing means in the outer surface being located in the working length of the core on the side of the circumference of interference towards the narrow end of the roll between the sleeve and the core wherein the said circumference of interference is the circumferential line on the core located at that location on the core beyond which the sleeve, when slid on the core from the end of minimum diameter thereof cannot be moved towards the end of maximum diameter of the core without expansion of the sleeve.
19. A printing sleeve adapted for interference fitting with a printing roll core having an outer surface which has one longitudinal end of a diameter greater than that of its other longitudinal end and has apertures serving as compressed gas outlets positioned remote from the ends of the core, said sleeve having at least one end thereof an internal diameter in its unstressed condition between the maximum external diameter of the core and the external diameter of that portion of the core with gas outlets in its surface.
20. A printing sleeve adapted for interference fitting with a printing roll core having two axial ends at the end portion thereof an outer surface of the core having a working length extending between and up to each of the said ends and adapted to receive and support an expansible printing sleeve, the surface of the core having end portions of which the respective diameters are different whereby the working length of the outer surface has a minimum diameter and a maximum diameter, gas outlets in the outer surface said outlets being located in the working length of the outer surface on the side of the circumference of interference having the lesser diameter between the sleeve and the core wherein the said circumference of interference is the circumferential line on the core located at that location on the core beyond which one end of the sleeve, when slid on the core from the end of minimum diameter thereof cannot be moved towards the end of maximum diameter of the core without expansion of the sleeve, said sleeve having two axial ends, at least the said one of said ends having in an unstressed condition an internal diameter greater than the said minimum diameter and less than the said maximum diameter of the outer surface of the core, said diameter of said one sleeve end being such that when said sleeve is slid on the core from the end of minimum diameter thereof it contacts a circumferential line on the core beyond which one end of the sleeve when slid on the core from the end of the minimum diameter cannot be moved toward the end of maximum diameter of the core without expansion of the sleeve and said diameter of said one sleeve being such that said circumferential line on said core is situated between said gas outlets and said end of maximum diameter of said core.
21. A method according to claim 17 in which the sleeve is prepared by coating a shell of fibre reinforced plastics mate-rial with an uncured elastomer and curing the elastomer in situ.
22. A method according to claim 17 or claim 21 in which the elastomer provides the printing surface of the sleeve.
23. A method according to claim 17 or claim 21 in which a flexible printing sheet is secured by adhesion to the elastomer.
24. A method according to claim 17 in which the sleeve is prepared by directly adhering a flexible printing sheet to a shell of fibre reinforced plastics material.
25. A printing roll according to claim 18 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.
26. A printing roll according to claim 25 in which the degree of taper is in the range from 5 parts in 10,000 to 5 parts in 20,000.
27. A printing roll according to claim 26 in which the degree of taper is substantially 5 parts in 20,000.
28. A printing roll according to claim 18 wherein the core has a step transition in the outer surface between the ends of different diameter.
29. A printing roll according to claim 28 wherein the height of the step is greater than the designed undersize of the sleeve on the end of the core of greater diameter.
30. A printing roll according to claim 18 in which the sleeve includes a radially inner seamless shell of reinforced plastics material.
31. A printing roll according to claim 30 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.
32. A printing roll according to claim 30 in which the radially outer surface of the inner shell is substantially cylindrical.
33. A printing roll according to any of claims 18, 25 or 28 in which there is provided ducting within a hollow said core for conveying gas under pressure to the gas outlets.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1406077 | 1977-04-04 | ||
| GB14060/77 | 1977-04-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1115125A true CA1115125A (en) | 1981-12-29 |
Family
ID=10034277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA281,864A Expired CA1115125A (en) | 1977-04-04 | 1977-06-30 | Printing sleeve |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS53125105A (en) |
| BE (1) | BE856427A (en) |
| CA (1) | CA1115125A (en) |
| DE (1) | DE2731333A1 (en) |
| ES (1) | ES460305A2 (en) |
| FR (1) | FR2386416A1 (en) |
| IT (1) | IT1114626B (en) |
| NL (1) | NL7707402A (en) |
| SE (1) | SE7707212L (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2966610D1 (en) * | 1978-09-13 | 1984-03-08 | Drg Uk Ltd | Manufacture of printing sleeves |
| DE3139494C2 (en) * | 1981-09-30 | 1983-11-10 | Herlitz Ag, 1000 Berlin | roller |
| FR2720030B1 (en) | 1994-05-19 | 1996-08-09 | Jean Francille | Device for mounting printing sleeves on cylinders supporting flexographic machines. |
| DE10219376A1 (en) | 2001-05-21 | 2002-11-28 | Heidelberger Druckmasch Ag | Sleeve-shaped printing element for web-processing rotary printer, is formed on material permitting radial expansion and has inner diameter increasing from one end to another |
| BE1027278B1 (en) | 2019-05-15 | 2020-12-15 | Hannecard Nv | ROLL CORE AND APPLICATOR ROLL WITH INTERCHANGEABLE ROLLER SHELL |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2501629A (en) * | 1944-06-13 | 1950-03-21 | Revere Copper & Brass Inc | Print roll |
| US2992479A (en) * | 1958-05-14 | 1961-07-18 | Musser C Walton | Method of making equal temperature press-fit of tubular members |
| US3146709A (en) * | 1962-04-09 | 1964-09-01 | West Essex Printing Plate Inc | Method and apparatus for mounting printing sleeves |
| US3639959A (en) * | 1970-03-23 | 1972-02-08 | Armstrong Cork Co | Glass fiber cord rubber roller |
| JPS5163708A (en) * | 1974-09-26 | 1976-06-02 | Emu Ei Batsukuree Engureibingu | |
| IN146438B (en) * | 1976-01-08 | 1979-06-02 | Strachan & Henshaw Ltd |
-
1977
- 1977-06-22 SE SE7707212A patent/SE7707212L/en unknown
- 1977-06-30 CA CA281,864A patent/CA1115125A/en not_active Expired
- 1977-07-01 ES ES460305A patent/ES460305A2/en not_active Expired
- 1977-07-04 FR FR7720471A patent/FR2386416A1/en not_active Withdrawn
- 1977-07-04 BE BE179037A patent/BE856427A/en unknown
- 1977-07-04 IT IT25367/77A patent/IT1114626B/en active
- 1977-07-04 NL NL7707402A patent/NL7707402A/en not_active Application Discontinuation
- 1977-07-12 DE DE19772731333 patent/DE2731333A1/en active Granted
- 1977-07-28 JP JP9134277A patent/JPS53125105A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| IT1114626B (en) | 1986-01-27 |
| ES460305A2 (en) | 1979-07-01 |
| DE2731333A1 (en) | 1978-10-05 |
| JPS53125105A (en) | 1978-11-01 |
| NL7707402A (en) | 1978-10-06 |
| DE2731333C2 (en) | 1988-09-22 |
| BE856427A (en) | 1977-10-31 |
| SE7707212L (en) | 1978-10-05 |
| FR2386416A1 (en) | 1978-11-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4144812A (en) | Printing sleeves | |
| US4144813A (en) | Printing sleeves | |
| US5752444A (en) | Seamless printing sleeve and method of manufacture thereof | |
| US4583460A (en) | Printing roll with detachable sleeves and kit therefor | |
| EP0366395B1 (en) | Printing sleeves and methods for mounting and dismounting such printing sleeves | |
| FI70176C (en) | FOERFARANDE FOER REGUMMERING AV FORDONSDAECK | |
| EP0043623B1 (en) | Cylindrical sleeve for use in a printing operation as well as method for manufacturing such a sleeve | |
| US6042048A (en) | Core for winding a web of deformable material | |
| CA2122755A1 (en) | Anisotropic endless printing element and method for making the same | |
| EP2591914B1 (en) | A cylindrically-shaped element for use in printing | |
| KR960038172A (en) | Bellows type air spring and manufacturing method thereof | |
| KR950002971A (en) | Tire production drum and tire manufacturing method with improved mobility | |
| US4272872A (en) | Device for holding a thin-walled metal cylinder | |
| EP1567341B1 (en) | Gapless compressible print cylinder assembly | |
| CA1115125A (en) | Printing sleeve | |
| US3035331A (en) | Method for contracting resilient rolls to fit sleeves thereon and product | |
| GB1581232A (en) | Printing roll with detachable sleeve and method of fitting that sleeve | |
| EP0181726A2 (en) | Printing roll with detachable sleeve | |
| US7316183B2 (en) | Sleeve with multiple layer structure for printing presses and method for its manufacture | |
| US7240766B2 (en) | Sound dampening pad | |
| GB1380997A (en) | Building of pneumatic tyres | |
| WO2003048619A2 (en) | Expandable plug and method of manufacture | |
| GB2311755A (en) | A sleeve for printing cylinders | |
| JPS57178840A (en) | Method of and apparatus for manufacturing radial tire | |
| JPH0733632U (en) | Molding drum for tread |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |