CA2389673C - Printing device for printing on corrugated cardboard - Google Patents
Printing device for printing on corrugated cardboard Download PDFInfo
- Publication number
- CA2389673C CA2389673C CA002389673A CA2389673A CA2389673C CA 2389673 C CA2389673 C CA 2389673C CA 002389673 A CA002389673 A CA 002389673A CA 2389673 A CA2389673 A CA 2389673A CA 2389673 C CA2389673 C CA 2389673C
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- Prior art keywords
- printing
- blanket
- cylinder
- layer
- blanket cylinder
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Classifications
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- 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
- B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
- B41N10/02—Blanket structure
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- 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
- B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
- B41N10/02—Blanket structure
- B41N10/04—Blanket structure multi-layer
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- 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
- B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
- B41N2210/02—Top layers
-
- 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
- B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
- B41N2210/14—Location or type of the layers in multi-layer blankets or like coverings characterised by macromolecular organic compounds
Abstract
An offset printing device features a printing blanket with a blanket support on a blanket cylinder. In offset printing devices of this kind, the processing of printable materials with uneven surfaces is to be possible with a high printing quality. Thus, a blanket support is provided which features a dimensionally stable support layer and a reversibly compressible functional layer.
Description
PRINTING DEVICE FOR PRINTING ON CORRUGATED CARDBOARD
Description The invention pertains to a device for printing on uneven printable materials.
State of the Art It is known in printing technology applied to printing devices to provide spacer elements that can compensate for surface unevenness on printable material during the transfer of a print image. In all conventional printing methods, a print image within a printing device is applied to a printable material by rolling cylinders or drums carrying the print image and guiding the printable material.
Here, the print image is produced on a printing plate, and, if necessary, it is passed along to the printable material by means of a transfer cylinder.
In direct printing processes, such as high-relief printing using a flexible printing method, for instance, a printing plate equipped with elevated printing surfaces is used, and with it, the print image is applied directly to the printable material.
In offset printing, which is an indirect printing process, the print image is transferred from a printing plate to a transfer cylinder, which is called the blanket cylinder. From there, the print image is transferred to the printable material.
Normally, a flexible layer is applied to the blanket cylinder. In standard offset printing, a so-called printing blanket or rubber cloth is used. This printing blanket is dimensionally stable in its expansion plane but deformable in the transverse direction. It can also be compressible to a certain extent in the direction of its thickness. In this regard, it is known to provide compressible layers within a printing blanket.
Rubber cloths or printing blankets used in offset printing are required in the offset printing process for the transfer of the print image and in particular to compensate for surface unevenness in the printable material. Since the printing plates for offset printing usually consist of thin sheet metal or foils, they cannot adapt sufficiently to the surface of the printable material.
f For satisfactory printing quality, a printing blanket must be pressed against the surface of the printable material with a relatively high contact pressure by using the blanket cylinder against the counter-pressure cylinder. Likewise, this cannot be avoided even by the use of so-called compressible printing blankets, since they merely have greater deformability than the standard printing blankets, but yet still require a comparatively large contact pressure.
Thus, when printing on uneven printing materials, there are limits to the conventional offset printing method. First, a printing blanket can only be deformed to a limited extent, and a satisfactory pressing of the printing blanket against the printable material to maintain an acceptable print quality is still required, whereas the printable material has an equally limited load resistance.
Thus, for example, when printing on corrugated cardboard, a particular problem arises which is related to the internal structure of the corrugated carton.
Since a corrugated connecting layer is provided between two covering layers in order to reduce the weight, a corrugated cardboard carton is not a homogeneous material. The cover layers used on the upper and lower sides of this type of corrugated cardboard are connected by means of a corrugated intermediate layer, and only at certain points or linearly, and yet the layers are offset on both sides to each other. When the surface of corrugated cardboard is stressed, irregular conditions appear across the surface. In particular, each cover layer is flexible in the regions between the connecting points with the corrugated intermediate layer, and thus these regions yield when stressed. During the stress occurring in a printing process, relatively unfavorable conditions for a uniform printing are encountered.
Therefore, it is now known how to apply a flexible and compressible substrate beneath the printing plate in the flexible printing method. In this regard, it is assumed that the printing plate is itself not compressible, that is, it is rigid and the substrate permits movement of the printing plate with respect to the printing plate cylinder. As substrate, for example, a foam material is used which is located on a substrate that can withstand tensile load. By means of the load-resistant substrate, the flexible substrate can be tensioned simultaneously with the printing plate on the printing plate cylinder. A length expansion is not expected in this case. In this manner, the printing plate is put into a position to follow the surface unevenness on the printable material, at least to a limited extent. But then a deterioration in the print quality must be taken into account, which necessarily results from the deformation of the printing plate. This is also related to the usually very inhomogeneous distribution of printed and non-printed regions on a printing plate. In addition, the registration of printing plates for the various print colors is very difficult.
In offset printing this type of procedure is unknown. Of course, stretching the so-called substrate sheet on the printing blanket cylinder underneath the printing plates or printing blankets is a known procedure. But they only help with the alignment, and the perimeter of the printing blanket cylinder stretched with the printing blanket, or the perimeter of the forming cylinder tensioned with the printing plate is to be adjusted to the conditions required in a printing process.
Furthermore, another method is in use which is not comparable to the method using the substrate for a printing plate; it uses compressible printing blankets. A compressible printing blanket permits deformations due to thickness reduction only under comparatively high pressure. The deformations in these printing blankets required for adaptation to the surface structure of the corrugated cardboard in a printing process would necessarily result in destruction of the corrugated cardboard before the printing blanket could sufficiently deform.
Therefore, no method is yet known for use in offset printing that allows a uniform print distribution for the processing of corrugated cardboard in a single printing process.
The purpose of the invention is to allow the printing of high-quality print images on corrugated cardboard.
Problem of the invention Therefore, the problem of the invention is to create a device so that high-quality printing and a uniform production of print images upon the surface of a corrugated cardboard will be possible using an offset printing method, and the corrugated cardboard will not be mechanically damaged.
In accordance with a first broad aspect of the present invention, there is provided a device for printing on printable materials with an uneven surface, with a forming cylinder, a blanket cylinder, and a counter-pressure cylinder, such that a -3a-printing plate is stretched over the forming cylinder, and such that, in addition, a printing blanket which is essentially dimensionally stable in its expansion plane is stretched over the blanket cylinder, wherein said printing blanket has a smooth surface and is deformable transverse to the expansion plane, and such that beneath the printing blanket, a support is stretched upon the blanket cylinder, characterized in that the support comprises a replaceable layer which is elastically deformable in a radial direction to the blanket cylinder.
In accordance with a second broad aspect of the present invention, there is provided a method for printing on corrugated cardboard, characterized in that a printing image is produced in an offset printing machine with a forming cylinder, a blanket cylinder and a counter-pressure cylinder, such that a printing plate is stretched over the forming cylinder, and such that, in addition, a printing blanket which is essentially dimensionally stable in its expansion plane is stretched over the blanket cylinder, wherein said printing blanket has a smooth surface and is deformable transverse to the expansion plane, and such that beneath the printing blanket, a blanket support is stretched over the blanket cylinder, characterized in that the printed image is applied to the blanket cylinder by means of the flat printing plate, in that the printed image from the blanket cylinder is applied by means of deformation of the blanket support, which comprises a replaceable, elastically deformable layer underneath the printing blanket and positioned radial to the blanket cylinder, said layer being on the surface of a corrugated cardboard of varying surface strength and resting upon the counter-pressure cylinder, and in that the printing blanket resting in the deformable layer adapts to the surface contour of the corrugated cardboard.
s In this case, in particular by use of a flexible substrate underneath the printing blanket, an increased deformation of the printing blanket radial to the printing blanket cylinder is now possible during the printing process. The deformation is possible with less force, in comparison to the deformation of a compressible printing blanket. At the same time, the length stability of the printing blanket is retained, so that a good print quality will be assured. Thus, printing on an uneven surface, such as that of corrugated cardboard, for example, is possible using offset printing. Thus, a number of additional process advantages arise, which are due to the offset printing method. In particular, these are the use of less expensive printing plates and simpler registration during multi-color printing.
An embodiment example of the invention will be explained in greater detail with reference to the drawing.
Examples The drawing shows:
Figure 1 An offset printing machine Figure 2 A printing process in one print zone, and Figure 3 A detailed representation of the print zone.
Figure 1 illustrates an offset printing machine. The printing unit has a counter-pressure cylinder 1, a blanket cylinder 2, a forming cylinder 3 and associated with it, an inking unit 4 and a moistening unit 5. The counter-pressure cylinder 1 is used to control a sheet of printable material. For this purpose, it is equipped with a grasper system which is not included in the illustration here.
The sheet of printable material is moved on a smooth surface. Opposite the counter-pressure cylinder 1 is the blanket cylinder 2. The blanket cylinder 2 is tensioned with a printing blanket. The printing blanket is stable in length yet flexible transverse to its surface extent. It can be slightly compressible.
The printing blanket is tightly stretched upon the blanket cylinder 2. The forming cylinder 3 is allocated to the blanket cylinder 2. A printing plate is placed upon the forming cylinder 3 and in offset printing, it usually consists of a thin metal plate.
The printing plate is supplied with ink from the inking unit 4 and the printable surfaces are first differentiated from the non-printable surfaces by the water applied by the moistening unit 5.
f In this type of offset printing machine the transfer of printing ink to printable materials with variable thickness and rigidity or surface characteristics is the objective, and the print quality is to be as uniform as possible over the entire surface.
Figure 2 illustrates a print zone corresponding to Figure 1 between the blanket cylinder 2 and the counter-pressure cylinder 1, where the indicated diameter conditions between the counter-pressure cylinder 1 shown below, and the blanket cylinder 2 shown above, need not necessarily correspond to their actual positions. In Figure 2 on the lower counter pressure cylinder 1 there is a printable material, which is designed here as corrugated cardboard 6. The corrugated cardboard 6 consists of a lower cover layer 6A and an upper cover layer 6B. The two cover layers are joined together by a corrugated connecting layer 6C, and the lower cover layer 6B is glued to the lower edges of the connecting layer 6C, and the upper cover layer 6A is glued to the upper edges of the connecting layer 6C. Due to this connection, a very stable printable material is obtained, at least in regard to its bending strength. Printable materials in the form of corrugated cardboard 6 are often used in particular in the packing industry.
Again, located opposite the counter pressure cylinder 1 is the blanket cylinder 2.
On the blanket cylinder 2 a printing blanket 7 is located on the outside. It is shown here as a homogeneous layer, and normally printing blankets are designed as so-called rubber cloths and are composed of at least one non-stretchable base layer and one flexible cover layer. In addition, other intermediate layers that improve the functionality of the printing blanket 7 may be used. Furthermore, on the blanket cylinder 2, underneath the printing blanket 7 there is a printing blanket substrate 8 located directly on the surface of the blanket cylinder 2. The printing blanket substrate 8 is composed of a non-stretch foundation layer 8A, and located thereon, a flexible cover layer 8B. The non-stretch foundation layer 8A can be a strong plastic film. The flexible cover layer 8B is made preferably of a layer of foam material with a particular quality characteristic. Due to the non-stretch foundation layer 8A, the printing blanket substrate 8 can be stretched together with the printing blanket 7 on the blanket cylinder 2, whereby the foam is joined securely with the foil. The surface of the blanket cylinder 2 is consequently identical to a standard blanket cylinder 2 with printing blanket 7.
Description The invention pertains to a device for printing on uneven printable materials.
State of the Art It is known in printing technology applied to printing devices to provide spacer elements that can compensate for surface unevenness on printable material during the transfer of a print image. In all conventional printing methods, a print image within a printing device is applied to a printable material by rolling cylinders or drums carrying the print image and guiding the printable material.
Here, the print image is produced on a printing plate, and, if necessary, it is passed along to the printable material by means of a transfer cylinder.
In direct printing processes, such as high-relief printing using a flexible printing method, for instance, a printing plate equipped with elevated printing surfaces is used, and with it, the print image is applied directly to the printable material.
In offset printing, which is an indirect printing process, the print image is transferred from a printing plate to a transfer cylinder, which is called the blanket cylinder. From there, the print image is transferred to the printable material.
Normally, a flexible layer is applied to the blanket cylinder. In standard offset printing, a so-called printing blanket or rubber cloth is used. This printing blanket is dimensionally stable in its expansion plane but deformable in the transverse direction. It can also be compressible to a certain extent in the direction of its thickness. In this regard, it is known to provide compressible layers within a printing blanket.
Rubber cloths or printing blankets used in offset printing are required in the offset printing process for the transfer of the print image and in particular to compensate for surface unevenness in the printable material. Since the printing plates for offset printing usually consist of thin sheet metal or foils, they cannot adapt sufficiently to the surface of the printable material.
f For satisfactory printing quality, a printing blanket must be pressed against the surface of the printable material with a relatively high contact pressure by using the blanket cylinder against the counter-pressure cylinder. Likewise, this cannot be avoided even by the use of so-called compressible printing blankets, since they merely have greater deformability than the standard printing blankets, but yet still require a comparatively large contact pressure.
Thus, when printing on uneven printing materials, there are limits to the conventional offset printing method. First, a printing blanket can only be deformed to a limited extent, and a satisfactory pressing of the printing blanket against the printable material to maintain an acceptable print quality is still required, whereas the printable material has an equally limited load resistance.
Thus, for example, when printing on corrugated cardboard, a particular problem arises which is related to the internal structure of the corrugated carton.
Since a corrugated connecting layer is provided between two covering layers in order to reduce the weight, a corrugated cardboard carton is not a homogeneous material. The cover layers used on the upper and lower sides of this type of corrugated cardboard are connected by means of a corrugated intermediate layer, and only at certain points or linearly, and yet the layers are offset on both sides to each other. When the surface of corrugated cardboard is stressed, irregular conditions appear across the surface. In particular, each cover layer is flexible in the regions between the connecting points with the corrugated intermediate layer, and thus these regions yield when stressed. During the stress occurring in a printing process, relatively unfavorable conditions for a uniform printing are encountered.
Therefore, it is now known how to apply a flexible and compressible substrate beneath the printing plate in the flexible printing method. In this regard, it is assumed that the printing plate is itself not compressible, that is, it is rigid and the substrate permits movement of the printing plate with respect to the printing plate cylinder. As substrate, for example, a foam material is used which is located on a substrate that can withstand tensile load. By means of the load-resistant substrate, the flexible substrate can be tensioned simultaneously with the printing plate on the printing plate cylinder. A length expansion is not expected in this case. In this manner, the printing plate is put into a position to follow the surface unevenness on the printable material, at least to a limited extent. But then a deterioration in the print quality must be taken into account, which necessarily results from the deformation of the printing plate. This is also related to the usually very inhomogeneous distribution of printed and non-printed regions on a printing plate. In addition, the registration of printing plates for the various print colors is very difficult.
In offset printing this type of procedure is unknown. Of course, stretching the so-called substrate sheet on the printing blanket cylinder underneath the printing plates or printing blankets is a known procedure. But they only help with the alignment, and the perimeter of the printing blanket cylinder stretched with the printing blanket, or the perimeter of the forming cylinder tensioned with the printing plate is to be adjusted to the conditions required in a printing process.
Furthermore, another method is in use which is not comparable to the method using the substrate for a printing plate; it uses compressible printing blankets. A compressible printing blanket permits deformations due to thickness reduction only under comparatively high pressure. The deformations in these printing blankets required for adaptation to the surface structure of the corrugated cardboard in a printing process would necessarily result in destruction of the corrugated cardboard before the printing blanket could sufficiently deform.
Therefore, no method is yet known for use in offset printing that allows a uniform print distribution for the processing of corrugated cardboard in a single printing process.
The purpose of the invention is to allow the printing of high-quality print images on corrugated cardboard.
Problem of the invention Therefore, the problem of the invention is to create a device so that high-quality printing and a uniform production of print images upon the surface of a corrugated cardboard will be possible using an offset printing method, and the corrugated cardboard will not be mechanically damaged.
In accordance with a first broad aspect of the present invention, there is provided a device for printing on printable materials with an uneven surface, with a forming cylinder, a blanket cylinder, and a counter-pressure cylinder, such that a -3a-printing plate is stretched over the forming cylinder, and such that, in addition, a printing blanket which is essentially dimensionally stable in its expansion plane is stretched over the blanket cylinder, wherein said printing blanket has a smooth surface and is deformable transverse to the expansion plane, and such that beneath the printing blanket, a support is stretched upon the blanket cylinder, characterized in that the support comprises a replaceable layer which is elastically deformable in a radial direction to the blanket cylinder.
In accordance with a second broad aspect of the present invention, there is provided a method for printing on corrugated cardboard, characterized in that a printing image is produced in an offset printing machine with a forming cylinder, a blanket cylinder and a counter-pressure cylinder, such that a printing plate is stretched over the forming cylinder, and such that, in addition, a printing blanket which is essentially dimensionally stable in its expansion plane is stretched over the blanket cylinder, wherein said printing blanket has a smooth surface and is deformable transverse to the expansion plane, and such that beneath the printing blanket, a blanket support is stretched over the blanket cylinder, characterized in that the printed image is applied to the blanket cylinder by means of the flat printing plate, in that the printed image from the blanket cylinder is applied by means of deformation of the blanket support, which comprises a replaceable, elastically deformable layer underneath the printing blanket and positioned radial to the blanket cylinder, said layer being on the surface of a corrugated cardboard of varying surface strength and resting upon the counter-pressure cylinder, and in that the printing blanket resting in the deformable layer adapts to the surface contour of the corrugated cardboard.
s In this case, in particular by use of a flexible substrate underneath the printing blanket, an increased deformation of the printing blanket radial to the printing blanket cylinder is now possible during the printing process. The deformation is possible with less force, in comparison to the deformation of a compressible printing blanket. At the same time, the length stability of the printing blanket is retained, so that a good print quality will be assured. Thus, printing on an uneven surface, such as that of corrugated cardboard, for example, is possible using offset printing. Thus, a number of additional process advantages arise, which are due to the offset printing method. In particular, these are the use of less expensive printing plates and simpler registration during multi-color printing.
An embodiment example of the invention will be explained in greater detail with reference to the drawing.
Examples The drawing shows:
Figure 1 An offset printing machine Figure 2 A printing process in one print zone, and Figure 3 A detailed representation of the print zone.
Figure 1 illustrates an offset printing machine. The printing unit has a counter-pressure cylinder 1, a blanket cylinder 2, a forming cylinder 3 and associated with it, an inking unit 4 and a moistening unit 5. The counter-pressure cylinder 1 is used to control a sheet of printable material. For this purpose, it is equipped with a grasper system which is not included in the illustration here.
The sheet of printable material is moved on a smooth surface. Opposite the counter-pressure cylinder 1 is the blanket cylinder 2. The blanket cylinder 2 is tensioned with a printing blanket. The printing blanket is stable in length yet flexible transverse to its surface extent. It can be slightly compressible.
The printing blanket is tightly stretched upon the blanket cylinder 2. The forming cylinder 3 is allocated to the blanket cylinder 2. A printing plate is placed upon the forming cylinder 3 and in offset printing, it usually consists of a thin metal plate.
The printing plate is supplied with ink from the inking unit 4 and the printable surfaces are first differentiated from the non-printable surfaces by the water applied by the moistening unit 5.
f In this type of offset printing machine the transfer of printing ink to printable materials with variable thickness and rigidity or surface characteristics is the objective, and the print quality is to be as uniform as possible over the entire surface.
Figure 2 illustrates a print zone corresponding to Figure 1 between the blanket cylinder 2 and the counter-pressure cylinder 1, where the indicated diameter conditions between the counter-pressure cylinder 1 shown below, and the blanket cylinder 2 shown above, need not necessarily correspond to their actual positions. In Figure 2 on the lower counter pressure cylinder 1 there is a printable material, which is designed here as corrugated cardboard 6. The corrugated cardboard 6 consists of a lower cover layer 6A and an upper cover layer 6B. The two cover layers are joined together by a corrugated connecting layer 6C, and the lower cover layer 6B is glued to the lower edges of the connecting layer 6C, and the upper cover layer 6A is glued to the upper edges of the connecting layer 6C. Due to this connection, a very stable printable material is obtained, at least in regard to its bending strength. Printable materials in the form of corrugated cardboard 6 are often used in particular in the packing industry.
Again, located opposite the counter pressure cylinder 1 is the blanket cylinder 2.
On the blanket cylinder 2 a printing blanket 7 is located on the outside. It is shown here as a homogeneous layer, and normally printing blankets are designed as so-called rubber cloths and are composed of at least one non-stretchable base layer and one flexible cover layer. In addition, other intermediate layers that improve the functionality of the printing blanket 7 may be used. Furthermore, on the blanket cylinder 2, underneath the printing blanket 7 there is a printing blanket substrate 8 located directly on the surface of the blanket cylinder 2. The printing blanket substrate 8 is composed of a non-stretch foundation layer 8A, and located thereon, a flexible cover layer 8B. The non-stretch foundation layer 8A can be a strong plastic film. The flexible cover layer 8B is made preferably of a layer of foam material with a particular quality characteristic. Due to the non-stretch foundation layer 8A, the printing blanket substrate 8 can be stretched together with the printing blanket 7 on the blanket cylinder 2, whereby the foam is joined securely with the foil. The surface of the blanket cylinder 2 is consequently identical to a standard blanket cylinder 2 with printing blanket 7.
Figure 3 presents a section from Figure 2, but illustrated in greater detail.
Again, at the lower side we see the printable material as corrugated cardboard 6.
Above the corrugated cardboard 6 there is a printing blanket 7, which has been adapted here to the deformed surface of the corrugated cardboard 6. The height differences with respect to the surface of the blanket cylinder 2, which is located at the top side, are compensated by the flexible cover layer 8B of the printing blanket substrate 8 designed as a foam layer. The foam material is compressed at those places where the upper side of the corrugated cardboard 6 is solid, i.e., preferably in the region of the gluing with the connecting layer 6C. Thus the printing blanket 7 can escape by being deformed by bending. In the gaps between two solid webs of the corrugated cardboard 6, the printing blanket 7 can follow the deformable surface of the corrugated cardboard 6, and the flexible cover layer 8B can perform this compensating function due to its design as a foam layer.
Due to corresponding adjustment of the applied pressure, i.e., the determination of the operating spacing of blanket cylinder 2 and counter-pressure cylinder 1, or by selection of different foam layers for the blanket support 8, this device can be used for different qualities of printable materials with uneven surfaces. In the case of relatively easily compressible printable materials, such as corrugated cardboard 6 as indicated in the present example, a softer foam is required than for relatively hard printable materials, such as solid cardboard.
The thickness of the blanket support 8 is important to the proper functioning of the device and to ensure the required print quality. Basically, for the stated application, blanket supports 8 with a thickness of 0.5 mm to 3 mm will come into consideration. For applications with known printable materials, selection of blanket supports 8 with a thickness of 1 mm to 2 mm is preferred. With regard to the foam material, a reversibly compressible foam which will last for several operating cycles is preferred. In this case, an open-cell foam is preferred for these applications.
List of Reference Symbols 1 Counter-pressure cylinder 2 Blanket cylinder 3 Forming cylinder 4 Inking unit 5 Moistening unit 6 Corrugated cardboard 6A Lower cover layer 6B Upper cover layer 6C Corrugated intermediate layer 7 Blanket 8 Blanket support 8A Non-stretch foundation layer 8B Flexible cover layer
Again, at the lower side we see the printable material as corrugated cardboard 6.
Above the corrugated cardboard 6 there is a printing blanket 7, which has been adapted here to the deformed surface of the corrugated cardboard 6. The height differences with respect to the surface of the blanket cylinder 2, which is located at the top side, are compensated by the flexible cover layer 8B of the printing blanket substrate 8 designed as a foam layer. The foam material is compressed at those places where the upper side of the corrugated cardboard 6 is solid, i.e., preferably in the region of the gluing with the connecting layer 6C. Thus the printing blanket 7 can escape by being deformed by bending. In the gaps between two solid webs of the corrugated cardboard 6, the printing blanket 7 can follow the deformable surface of the corrugated cardboard 6, and the flexible cover layer 8B can perform this compensating function due to its design as a foam layer.
Due to corresponding adjustment of the applied pressure, i.e., the determination of the operating spacing of blanket cylinder 2 and counter-pressure cylinder 1, or by selection of different foam layers for the blanket support 8, this device can be used for different qualities of printable materials with uneven surfaces. In the case of relatively easily compressible printable materials, such as corrugated cardboard 6 as indicated in the present example, a softer foam is required than for relatively hard printable materials, such as solid cardboard.
The thickness of the blanket support 8 is important to the proper functioning of the device and to ensure the required print quality. Basically, for the stated application, blanket supports 8 with a thickness of 0.5 mm to 3 mm will come into consideration. For applications with known printable materials, selection of blanket supports 8 with a thickness of 1 mm to 2 mm is preferred. With regard to the foam material, a reversibly compressible foam which will last for several operating cycles is preferred. In this case, an open-cell foam is preferred for these applications.
List of Reference Symbols 1 Counter-pressure cylinder 2 Blanket cylinder 3 Forming cylinder 4 Inking unit 5 Moistening unit 6 Corrugated cardboard 6A Lower cover layer 6B Upper cover layer 6C Corrugated intermediate layer 7 Blanket 8 Blanket support 8A Non-stretch foundation layer 8B Flexible cover layer
Claims (5)
1. A printing machine for printing on printable materials having an uneven or deformable surface comprising a form cylinder having a printing plate, a blanket cylinder adjacent the form cylinder for receiving printed images from the printing plate, a counterpressure cylinder adjacent the blanket cylinder for transferring printable material past the blanket cylinder, said blanket cylinder having a.
printing blanket stretched about a support surface of said blanket cylinder defining a smooth ink transferable outer surface of the blanket cylinder, said printing blanket being substantially dimensionally stable in length while being deformable in a radial direction without substantial compressive deformation such that the printing blanket maintains a substantially constant radial thickness during radial deformation, and said blanket cylinder having a removable and replaceable support layer which is directly positionable about the support surface of said blanket cylinder in underlying relation to the printing blanket, said removable and replaceable support layer including a layer of open cell foam material which is elastically deformable in a radial direction to the blanket cylinder with a resulting change in radial thickness in response to pressure concentrations on the blanket by reason of uneven or deformable surfaces on the printable material, and said layer of foam material being fixed upon an outer surface of a dimensionally stable carrier layer having a radial thickness substantially less than the radial thickness of the said layer of foam material.
printing blanket stretched about a support surface of said blanket cylinder defining a smooth ink transferable outer surface of the blanket cylinder, said printing blanket being substantially dimensionally stable in length while being deformable in a radial direction without substantial compressive deformation such that the printing blanket maintains a substantially constant radial thickness during radial deformation, and said blanket cylinder having a removable and replaceable support layer which is directly positionable about the support surface of said blanket cylinder in underlying relation to the printing blanket, said removable and replaceable support layer including a layer of open cell foam material which is elastically deformable in a radial direction to the blanket cylinder with a resulting change in radial thickness in response to pressure concentrations on the blanket by reason of uneven or deformable surfaces on the printable material, and said layer of foam material being fixed upon an outer surface of a dimensionally stable carrier layer having a radial thickness substantially less than the radial thickness of the said layer of foam material.
2. The printing machine of claim 1 in which said printing blanket is a substantially incompressible rubber cloth stretched upon the blanket cylinder.
3. The printing machine of claim 2 in which said printing blanket is a slightly compressible rubber cloth stretched upon the blanket cylinder.
4. The printing machine of claim 1 in which said foam layer has a thickness of between 0.5 to 3mm.
5. The printing machine of claim 1 in which said foam layer has a thickness of between 1.2 and 1.6mm.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19952802A DE19952802A1 (en) | 1999-11-02 | 1999-11-02 | Printing unit for printing corrugated cardboard |
| DE19952802.0 | 1999-11-02 | ||
| PCT/EP2000/010752 WO2001032436A1 (en) | 1999-11-02 | 2000-10-31 | Printer for printing corrugated cardboard |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2389673A1 CA2389673A1 (en) | 2001-05-10 |
| CA2389673C true CA2389673C (en) | 2006-07-25 |
Family
ID=7927716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002389673A Expired - Fee Related CA2389673C (en) | 1999-11-02 | 2000-10-31 | Printing device for printing on corrugated cardboard |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US6957606B1 (en) |
| EP (1) | EP1227937B1 (en) |
| JP (1) | JP2003512959A (en) |
| CN (1) | CN1212942C (en) |
| AT (1) | ATE249937T1 (en) |
| AU (1) | AU1516601A (en) |
| CA (1) | CA2389673C (en) |
| DE (2) | DE19952802A1 (en) |
| WO (1) | WO2001032436A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003013839A1 (en) * | 2001-08-10 | 2003-02-20 | Model Holding Ag | Surface-textured cardboard, device and method for producing the same |
| ITMO20030022A1 (en) * | 2003-02-03 | 2004-08-04 | Comital Spa | METHOD AND APPARATUS TO DECORATE OBJECTS, AND SEMI-FINISHED PRODUCTS |
| CN1317136C (en) * | 2003-10-14 | 2007-05-23 | 上海外贸界龙彩印厂 | Method for printing miniature corrugated board by direct offset printing |
| US20050098534A1 (en) * | 2003-11-12 | 2005-05-12 | Molecular Imprints, Inc. | Formation of conductive templates employing indium tin oxide |
| US7498274B2 (en) | 2004-05-14 | 2009-03-03 | Day International, Inc. | Composite packing material for use in offset lithography and method of making |
| CN103991298B (en) * | 2014-04-29 | 2017-06-06 | 广东绿之彩印刷科技股份有限公司 | A kind of offset printing process of tiny corrugated paper board |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3652376A (en) * | 1969-07-11 | 1972-03-28 | Grace W R & Co | Multi-ply press packing for the impression member in a letter press |
| DE2337962A1 (en) * | 1973-07-26 | 1975-04-03 | Phoenix Gummiwerke Ag | Two-part pressure-cloth for offset printing-machines - has ink-carrier-track consisting of fabric, rubber, plastic and top rubber |
| JPS5842047A (en) * | 1981-09-07 | 1983-03-11 | Ricoh Co Ltd | Developing apparatus for use in diazo wet type copying machine |
| JPS61144351A (en) * | 1984-12-19 | 1986-07-02 | Yoji Iwasaki | Method for printing on corrugated cardboard sheet |
| US4817527A (en) * | 1986-03-06 | 1989-04-04 | R.R. Donnelley & Sons Company | Printing blanket with carrier plate and method of assembly |
| US6374734B1 (en) * | 1989-10-05 | 2002-04-23 | Heidelberger Druckmaschinen Ag | Tubular printing blanket |
| US5350623A (en) * | 1992-09-21 | 1994-09-27 | Derrick Steven L | Compressible blanket assembly |
| DE4437025C2 (en) * | 1994-10-10 | 2002-12-05 | Joachim Patschorke | Printing blanket for printing machines |
| USRE38468E1 (en) * | 1996-12-04 | 2004-03-23 | Day International, Inc. | Replaceable sleeve |
| JP3436474B2 (en) * | 1997-07-29 | 2003-08-11 | 住友ゴム工業株式会社 | Under blanket |
| FR2770451B1 (en) * | 1997-11-06 | 1999-12-31 | Rollin Sa | IMPROVED LITHOGRAPHIC LAYER FOR PRINTING BLANCHET AND BLANCHET PROVIDED WITH THIS LAYER |
| JP3357587B2 (en) * | 1997-11-14 | 2002-12-16 | 住友ゴム工業株式会社 | Printing blanket |
-
1999
- 1999-11-02 DE DE19952802A patent/DE19952802A1/en not_active Withdrawn
-
2000
- 2000-10-31 CA CA002389673A patent/CA2389673C/en not_active Expired - Fee Related
- 2000-10-31 EP EP00977452A patent/EP1227937B1/en not_active Expired - Lifetime
- 2000-10-31 DE DE50003760T patent/DE50003760D1/en not_active Expired - Lifetime
- 2000-10-31 AU AU15166/01A patent/AU1516601A/en not_active Abandoned
- 2000-10-31 WO PCT/EP2000/010752 patent/WO2001032436A1/en active IP Right Grant
- 2000-10-31 AT AT00977452T patent/ATE249937T1/en not_active IP Right Cessation
- 2000-10-31 CN CNB008180954A patent/CN1212942C/en not_active Expired - Fee Related
- 2000-10-31 JP JP2001534615A patent/JP2003512959A/en active Pending
- 2000-10-31 US US10/111,929 patent/US6957606B1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE19952802A1 (en) | 2001-05-03 |
| CN1212942C (en) | 2005-08-03 |
| US6957606B1 (en) | 2005-10-25 |
| CA2389673A1 (en) | 2001-05-10 |
| ATE249937T1 (en) | 2003-10-15 |
| AU1516601A (en) | 2001-05-14 |
| DE50003760D1 (en) | 2003-10-23 |
| CN1414913A (en) | 2003-04-30 |
| EP1227937B1 (en) | 2003-09-17 |
| WO2001032436A1 (en) | 2001-05-10 |
| EP1227937A1 (en) | 2002-08-07 |
| JP2003512959A (en) | 2003-04-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |