CN1378507A - Substructure material for printing device and a printing cloth in order to print non-even material - Google Patents

Abstract

In order to create a substructure material for a printing mould, in particular a flat printing mould or a printing plate, and/or a printing cloth , in particular a rubber cloth, in a special compressible or non-compressible rubber cloth, and/or for another surface involved in a printing process, in particular in off-set printing wherewith an improved printed image is obtained and which allows printing moulds or print plates to be changed in an easier and more rapid fashion, a substructure material is embodied as an exchangeable, elastically deformable composite material ccommodated radially relative to said printing mould or printing plate and/or printing cloth and/or other cylinders involved in the printing process, said cylinders being linked to surfaces or connected radially to a drum.

Description

Substrates of printing devices and printing cloths for printing uneven printing materials

technical field

The invention relates to a substrate for a printing stencil, especially a stencil or a printing form, especially a lithographic plate, and/or for a printing blanket, especially a blanket, especially a compressible or non-compressible blanket, And/or another surface for participating in a printing operation during a printing process, especially an offset printing process, also relates to a printing device comprising said substrate, especially an offset printing device, and a method for printing uneven printing substrates, Printing cloth for corrugated cardboard.

Background technique

In printing technology, it is known to provide intermediate elements in printing units which compensate for unevennesses in the upper surface of the printing material during the transfer of the image to be printed. In all conventional printing processes, the image to be printed is applied to the printing material within the printing unit by means of rollers which transfer the image to be printed and guide the printing material. The image to be printed is thus produced on the printing stencil or plate and can finally be transferred from the transfer cylinder to the printing material.

In direct printing processes such as letterpress printing, for example in the case of flexographic printing, printing stencils or printing forms are used which have a raised printing surface, via which the image to be printed can be applied directly to the printing material.

As far as offset printing is concerned, that is, an indirect printing process, it is worth discussing in the general lithographic process that the image to be printed in the form of color is transferred by a printing stencil or plate to a transfer cylinder called a printing blanket . According to the image to be printed, the surface of the printing form or printing plate is connected with oleophilic or water-repellent areas, so that the oleophilic colorant applied by the inking unit adheres there. The image to be printed is then transferred to the printing material by the printing blanket, more precisely by the printing cloth stretched over the printing blanket described below.

In offset printing, which is an indirect printing process, the image to be printed is transferred via a printing stencil to a transfer cylinder called a printing blanket. The image to be printed is then transferred by the cylinder to the printing material. Typically, a flexible layer is applied to the printing blanket. In conventional offset printing processes, so-called printing blankets or blankets are used for this purpose. A printing cloth is dimensionally stable in its stretched plane, but deforms transversely to said plane. It can be compressed to some extent along its thickness. In this regard, it is known that compressible layers are provided inside the printing cloth.

The flexible layer is usually applied on a printing blanket; in the usual offset printing process a so-called printing blanket or blanket is used which is substantially dimensionally stable in its plane of extension but deformable transversely to said plane. The printing cloth can also be compressed to some extent in the direction of its thickness. In this regard, it is known that compressible layers are provided inside the printing cloth. The image to be printed is deposited via the printing cloth in the form of colorant on a printing material, for example on printing paper or printing cardboard.

Blankets or printing cloths for offset printing are used in the offset printing process to transfer the image to be printed and, in particular, also to compensate for surface unevenness of the printing material. Since the printing stencils or printing forms in offset printing are usually made of thin metal plates or films, they cannot themselves adequately adapt to the surface structure of the printing material.

In order to adapt the surface structure of the printing material necessary for perfect printing quality, the printing cloth must be pressed against the counter-pressure cylinder with relatively high pressure via the printing blanket cylinder; this is not possible by using so-called compressible printing cloths To avoid this, since these printing cloths have only slightly higher deformation than usual printing cloths and also require considerably higher pressures.

As far as substrates that are printed unevenly are concerned, there are naturally limitations to conventional offset printing; on the one hand, the printing cloth has only limited deformability, so that the printing cloth needs to be pressed sufficiently against the substrate to remain deformable. Acceptable print quality, on the other hand, is also limited by the stability of the substrate under load.

Thus, for example in the case of printing corrugated cardboard, a particular problem has arisen which is connected with the internal structure of the corrugated cardboard. Since in corrugated cardboard a corrugated connecting layer is provided between two protective layers to reduce weight, corrugated cardboard does not constitute a homogeneous material. The protective layers used under such corrugated boards are only at certain points or form rows, and otherwise are connected to each other by corrugated intermediate layers offset from each other at both ends. When loading a corrugated cardboard, unevenness is finally produced on the surface; in particular, each protective layer is flexible in the areas between the connection points with the corrugated interlayer, so when loaded into these areas Bendable. During the loading of the printing process, relatively unfavorable conditions for uniform printing eventually arise.

Thus, it is known in flexographic printing to fix a flexible and compressible liner underneath a printing stencil or plate. Here, the fact is induced that the printing stencil or printing plate itself is incompressible, i.e. rigid, and that the pads make it possible to press the printing stencil or printing plate plate roller) moves. For example, a foam layer is provided as the cushion, said foam layer being applied to a loadable tension cushion. By means of the loadable tension pad, the flexible pad can be tensioned simultaneously with the printing stencil on the printing stencil cylinder or with the printing plate on the printing plate cylinder, so that no longitudinal stretch is desired.

In this way, the printing stencil or plate is able to conform to irregular points on the surface of the printing material to a certain extent. At this point, however, poor printing quality must be tolerated, which inevitably leads to deformation of the printing stencil or printing plate; this also depends on the usually non-uniformity of the printing and non-printing areas on the printing stencil or printing plate. distribution; moreover, the registration of printing stencils or plates with respect to different printing colors is also very difficult.

As far as offset printing is concerned, this method is not known yet. It is known in practice that a so-called blanket layer is stretched underneath the printing cloth on the printing blanket. However, these shim layers are only used for so-called preparatory operations, so that the circumference of the printing blanket covered by the printing cloth should be adjusted to the conditions required in the printing process.

In addition, a method similar to the one described above for laying an underlayment under a printing stencil or plate is employed, just from the so-called compressible printing cloth. It is possible to deform compressible printing blankets by reducing the thickness only under relatively high pressure. The deformations in the printing cloth that are necessary to adapt to the surface structure of the corrugated cardboard naturally destroy the corrugated cardboard during the printing operation before the printing cloth is sufficiently deformed. For this reason, there is no known method in offset printing to achieve a highly uniform pressure distribution when processing corrugated cardboard in printing operations.

The drawbacks and deficiencies described in the above examples are generally present as long as the rotary cylinders involved in the printing operation in the offset printing process are usually made of hard materials such as metal. Printing stencils or plates are also made of solid material such as metals such as aluminium, zinc etc. or plastic. Since these materials are dimensionally stable, unevenness and unbalanced substances can arise which negatively affect the image to be printed. Furthermore, the rigidity of the material makes it difficult to change the printing stencil or plate as soon as there is no resilience to compensate for tolerances.

Contents of the invention

To this end, the object of the present invention is to improve an offset printing press of the type described in such a way that the image to be printed is improved, the printing plate can be changed as quickly and easily as possible, and that printing on uneven printing materials, especially corrugated printing materials, is possible. Improve the quality of the image to be printed on the cardboard. Therefore, the object of the present invention is to produce a high-quality and uniform image to be printed on the surface of the printing material in offset printing technology, for example on web or corrugated board; here, the printing material such as web or corrugated board should not mechanical damage in any way.

This object is achieved by a substrate having the features of claim 1 , a printing unit, in particular an offset printing unit, having the features of claim 13 , and a printing cloth having the features of claim 15 .

Advantageous constructions and suitably improved features of the invention are described in the corresponding dependencies.

The invention provides a substrate for a printing stencil, especially a stencil or a printing form, especially a lithographic plate, and/or for a printing blanket, especially a blanket, especially a compressible or non-compressible blanket , and/or another surface for participating in the printing process. Inadequacies, dimensional tolerances and unbalanced substances of the components involved in the printing process are available due to the fact that the substrate is designed as an exchangeable composite which can be elastically deformed in the radial direction relative to the respective rotary cylinder or the respective cylinder compensate. This homogenizes and improves the image to be printed.

In addition to improving the printing quality, it is surprising that the offset printing unit can be easily additionally equipped with the substrate according to the invention as a tensionable cushion, in particular as a tensionable printing stencil cushion or printing plate liner, and/or as a tensionable printing cloth liner constructed in the composite. By mounting the printing form or printing form on the printing form cylinder, the substrate is able to compensate possible dimensional tolerances between the printing form or printing form and the printing form cylinder due to its (radial) elasticity. Thus, the printing stencil or printing plate can be held tightly on the plate cylinder by utilizing the high forces and corresponding yield forces of the substrate.

With respect to the printing blanket cylinder, those skilled in the art of printing technology will understand that, in one example, the deformation of the printing blanket in the radial direction of the printing blanket can be increased during the printing process by a flexible substrate under the printing blanket Functional. Deformation is also achievable with relatively small forces relative to the deformation of the compressible printing cloth. At the same time, maintaining the longitudinal stability of the printing cloth ensures good printing quality and printing on uneven surfaces such as corrugated cardboard in offset printing technology.

In context, there are also other process advantages derived from the offset printing method; in particular, inexpensive printing stencils or plates can be used, and registration of multicolor printing is easy.

According to a particularly inventive development of said substrate, the composite is made of at least one compressible layer and at least one incompressible layer.

Insufficiencies, dimensional tolerances and unbalanced substances of the components involved in the printing operation can be compensated by the compressible layer, which is preferably configured as a reversibly compressible functional layer. This homogenizes and improves the image to be printed.

Since the compressible layer and the non-compressible layer are joined together, it is at the same time ensured that the substrate is used advantageously, so that the substrate can be held particularly sufficiently stably on the cylinders involved in the printing process. Furthermore, the connection of the compressible layer to the non-compressible layer increases the overall stability of the composite material such that forces in the compressible layer cause only limited deformation of the substrate.

According to a preferred embodiment of the invention, the compressible layer of the substrate may be a microporous material, preferably with open pores. Foam-type honeycomb structures allow the compressibility of the material to be adjusted to a certain extent as desired; if the microcellular compressible layer is suitably formed from polyurethane foam, a high resistance with ideal compressibility results. The substrate may be optimally selected with respect to other properties other than compressibility, such as its tear resistance and/or chemical stability.

The compressibility of the overall material is produced by its porous structure, which can be adjusted to the corresponding requirements by the user to a certain extent, regardless of the substrate.

As far as the incompressible layer is configured in an inventive development as a dimensionally stable carrier layer, in particular as a dimensionally stable plate or film, said incompressible layer can advantageously be composed in whole or in part of at least one The plastic is preferably a polyester-forming substance. The material is inexpensive, has high strength and at the same time is flexible with respect to bending, or is dimensionally stable with respect to traction forces. Furthermore, the materials can be easily combined with other materials to form composite materials.

According to a preferred embodiment of the present invention, the substrate may comprise one or more layers, the layers may in particular contain an adhesive material, a filler material and/or other auxiliary materials. The adhesive material is here used for joining adjacent layers, ie in particular for joining non-compressible and compressible layers. Filling materials are used to achieve the desired volume (-->layer thickness) of the substrate without affecting other properties of the material. Furthermore, other auxiliary material layers may be provided, for example to improve the connection to the carrier cylinder, to the printing stencil or plate, to the printing cloth, etc., or may be used on an outer surface.

The substrate comprises in its own structure at least two compressible layers, whereby these layers preferably have a different structure with respect to the substrate and/or with respect to the structure (porosity) and/or different thicknesses. The properties of the substrate can be controlled by the combination of several compressible layers when pressure is introduced. Thus, good local absorption of pressure and force peaks can be achieved, for example, by a thicker or stronger compressible layer in direct contact with the printing stencil or plate, whereas a harder (thinner) material at a lower position would cause Larger forces are distributed over a larger area.

In several exclusive structures of the substrate, the substrate comprises at least two incompressible layers which still have a different structure relative to the substrate and/or relative to the structure and/or different thicknesses. The properties of the substrate are naturally still governed by these defining criteria. Thus, in particular the layers which are in direct contact with the carrier element can be optimally designed for connection; this means, for example, that these materials have sufficient (tear) strength and/or sufficient thickness to be positioned on the drum. On the other hand, layers inside the substrate can be minimized to a thickness sufficient to be able to fulfill their carrier function throughout the composite.

The overall (layer) thickness of the planar substrate can be from about 0.5 mm to about 4 mm, especially from about 1.5 mm to about 2.5 mm. With such a layer thickness, the substrate can then be equipped with an existing printing unit without substantial changes in order to ensure that unevennesses are compensated in a predetermined manner.

Printing units are also the subject of protection of the invention, in particular offset printing units for printing substrates with particularly uneven surfaces, preferably made of paper or cardboard, comprising

- a printing form cylinder, on which a printing stencil, especially a planographic printing form, or a printing forme, especially a planographic printing form, is tensioned;

- a printing blanket cylinder on which is tensioned a printing blanket, in particular a blanket, especially a compressible or non-compressible blanket, which is substantially dimensionally stable in the plane of extension; and

- a counter pressure roller.

The printing unit is characterized in that the printing plate cylinder and/or the printing blanket cylinder and/or the counter-pressure cylinder and/or other surfaces involved in printing are coated on their surfaces with the aforementioned substrate. Precisely because the substrate has the stated properties, higher-quality printing results can be achieved with the printing unit. Furthermore, when the substrate is attached to a printing form cylinder carrying a printing form or printing form, the printing form cylinder can subsequently be equipped with different printing forms or printing forms in a simple and uncomplicated manner.

A printing cloth with the features of claim 15 brings the following advantages. In particular, the deformation of the special printing cloth in the radial direction of the printing blanket cylinder during the printing process can be improved by the flexible backing layer under or inside the special printing cloth. Deformation is also possible using less force than the deformation of known compressible printing cloths. At the same time, the longitudinal stability of the special printing cloth is maintained, thereby ensuring good printing quality. Thus, it is possible to print in offset printing on uneven surfaces of any material to be printed, such as corrugated cardboard. There are many other process advantages derived from the offset printing process. In particular, these advantages manifest themselves in the inexpensive printing stencils used and the simpler registration of multicolor printing.

Description of drawings

Two embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Figure 1 shows in a schematic diagram a first embodiment of an offset printing unit according to the invention;

Figure 2 shows a first embodiment of a typical layer structure of a substrate according to the invention in a schematic sectional view;

Figure 3 shows in a schematic diagram a second embodiment of the offset printing unit of the present invention;

Figure 4 shows the printing operation in the printing zone of the offset printing unit of Figure 3 in a schematic sectional view;

FIG. 5 shows the printed area of FIG. 4 in a schematic cross-sectional view.

Detailed ways

The same or similar structures, elements or features in FIGS. 1 to 5 are denoted by the same reference numerals.

Figure 1 shows the main elements of an offset printing press for rotary printing. The printing original is in the form of a so-called printing form or plate 11 on a first rotating cylinder, the form cylinder 10; said form cylinder 10 is sometimes also called form cylinder. The surface of the printing plate 11 is composed of hydrophilic (i.e. friendly to water) or oleophilic (i.e. friendly to grease) regions corresponding to the topographical surface of the printing plate, such that the inking system (not shown in FIG. 1 for clarity) applies The oleophilic printing colorants adhere only to the corresponding oleophilic areas. By using a water latex colorant, the binding conditions are switched so that the areas to be printed on the printing plate 11 are oil-repellent, ie are coated with an oil-repellent material.

The plate cylinder 10 is in contact with a blanket cylinder 12 . The surface of the blanket cylinder 12 is covered with a blanket 13 . In terms of relative rotation of the two cylinders 10 and 12 , the toner on the printing plate 11 is transferred to the blanket 13 . The colorant is then deposited on the printing web 14 as the blanket cylinder 12 rotates further. The web 14 is guided by a counter-pressure cylinder 15 (sometimes also called a plate cylinder), which ensures that a corresponding pressure is applied to the blanket 13 .

The offset printing method exemplified in FIGS. 1 and 2 (-->first embodiment) is improved by the fact that the substrate 100 is applied between the printing plate cylinder 10 and the printing plate 11 and/or the blanket cylinder 12 Between the blanket 13 and/or on the counter-pressure cylinder 15, said material is formed by a composite of compressible and non-compressible layers.

The installation of the substrate 100 on the plate cylinder 10 and blanket cylinder 12 is shown in FIG. 1 . Unevenness or unbalanced matter of the plate cylinder 10 and/or printing plate 11 can be repaired and compensated by the substrate 100, thereby improving the image to be printed. In addition, the mounting of the printing plate 11 on the printing plate cylinder 10 is easy, thus optimizing the additional equipment of the printing plate 11 . In this regard, the substrate 100 allows high printing speeds.

FIG. 2 shows a typical layer structure of the substrate 100 . In the case shown in FIG. 2 , a substrate 100 on a carrier 19 shows three different layers 16 , 17 and 18 in a sandwich structure.

The lowermost layer, ie the layer which is in contact with the carrier 19, is an open-celled (offenzelliges) polyurethane underlayment 18, the thickness of which is about 0.51 mm. The middle layer is Mylar 17, which is a hard, incompressible plastic material. The sandwich structure is covered by an open-celled polyurethane pad 16 with a thickness of about 1.02 mm. The overall thickness of the substrate 100 is about 2.10 mm.

The different layers 16, 17 and 18 can be connected to each other by adhesive layers. The plastic plate or plastic film 17 ensures that the substrate 100 has sufficient rigidity. Since the compressible layers 16 and 18 are located on the two outer surfaces of the sandwich material, unevenness of the cylinder 10 and a support layer such as the printing plate 11 can be compensated for. The upper face 20 of the polyurethane backing layer 16 is preferably smooth (and free of adhesive) so as to be particularly suitable as a support layer for the blanket 13 .

Thus, with the substrate 100 of the first embodiment of Figures 1 and 2, a rigid and compressible substrate can be used for printing plates for offset printing, as well as printing plates for hybrid printing with flexo and offset printing units. Next, the sandwich structure of the substrate is formed from a compressible foam cushion with different embossments and a plastic sheet or plastic film. One or several special polyurethane cushions can be combined with one or several special plastic sheets or plastic films: the thickness of the combination of polyurethane cushions and/or plastic sheets or plastic films in the interlayer can also be different .

Figure 3 schematically shows a second embodiment of the offset printing unit of the present invention. The offset printing unit has a counter-pressure cylinder 15 , a printing blanket cylinder 12 , and a printing plate cylinder 10 , on which a printing toner unit 21 and a dampening unit 22 are also arranged.

The counter pressure cylinder 15 is used to guide the printed web. For this purpose, the counter-pressure cylinder 15 has a claw supply system (not shown in detail in FIG. 3 for better visibility). The printed web is guided on a smooth surface.

The printing blanket cylinder 12 is located on the opposite side of the counter pressure cylinder 15 . On the printing blanket cylinder 12 is stretched a printing cloth 13 which is stable in the longitudinal direction and flexible in the transverse direction in which its surface is stretched, and can be compressed to a slight extent. The printing blanket 13 is tightly clamped on the printing blanket cylinder 12 .

The plate cylinder 10 rests on a printing blanket cylinder 12 . A printing form or printing stencil 11 , which usually consists of a thin metal plate, is stretched on a printing form cylinder 10 in offset printing. The printing plate 11 is supplied with printing ink by the printing ink unit 21 , so that the printing surface is distinguished from the non-printing surface by water supplied by the dampening unit 22 beforehand. In such an offset printing unit, as shown in the example in Fig. 3, the printing color is transferred as much as possible to the printing substrate with different thicknesses, so that the printing quality is as uniform as possible over the entire surface.

In Fig. 4, a printing area among Fig. 3 is positioned between printing blanket cylinder 12 and counter-pressure cylinder 15 for this reason, and the counter-pressure cylinder 15 drawn in Fig. 3 and Fig. The rough diameter ratios formed between the blanket cylinders 12 do not necessarily correspond to actual values.

The printing material is shown on the counter-pressure cylinder 15 in FIG. 4 , said material being designed as corrugated cardboard 14 ′ in the second exemplary embodiment. The corrugated cardboard 14' is shown with a lower protective layer 141' below in Figures 4 and 5 and an upper protective layer 143' above in Figures 4 and 5; The shape connection layer 142' is connected to each other, so that the lower protective layer 141' is glued on the lower edge of the connection layer 142', and the upper protection layer 143' is glued on the upper edge of the connection layer 142'; Connected, it forms a very stable printing material which is usually used especially for packaging materials.

The printing blanket cylinder 12 is still located on the opposite side of the counter-pressure cylinder 15, the printing blanket 13 being represented on the outside of said printing blanket cylinder. The printing blanket 13 is drawn as a homogeneous layer in FIG. 4, so that the printing blanket is usually configured as a so-called blanket and consists of a non-stretch base layer and a flexible protective layer. Additional interlayers can be added to increase the functionality of the printing cloth.

Furthermore, on the printing blanket cylinder 12 , the substrate 100 ′, which is configured as a blanket pad, is located directly on the surface of the printing blanket cylinder 12 under the printing blanket 13 . The substrate 100' is composed of a non-stretch base layer 17' and a flexible protective layer 16' disposed on the base layer 17'. While the non-stretch base layer 17' may be a solid plastic film, the flexible protective layer 16' is preferably a layer made of sized foam.

Due to the non-stretched base layer 17', the base material 100' configured as a printing cloth pad can be stretched together with the printing cloth 13 on the printing blanket cylinder 12 so that the foam (--> flexible protective layer 16') tightly connected with the plastic film (--> non-stretch base layer 17'). Accordingly, the surface of printing blanket cylinder 12 is similar to conventional printing blanket cylinders.

In Fig. 5, a cut portion of Fig. 4 is shown in detail. The corrugated cardboard 14' remains on the underside. On top of the corrugated cardboard 14' lies a printing cloth 13 which adapts itself to the deformed surface of the corrugated cardboard 14'. The difference in level of the surface of the printing blanket cylinder 12 relative to the part shown on the underside is compensated by a flexible protective layer 16 ′, known as a foam layer, which is designed as a substrate 100 ′ of a printing cloth backing. The foam material is compressed at points where the surface of the corrugated cardboard 14' is solid, so that the printing cloth 13 bends down when deformed accordingly by bending.

The printing cloth 13 can conform to the deformable surface of the corrugated cardboard 14' in the intermediate gap between the two solid tabs of the corrugated cardboard 14', so that the flexible protective layer 16' can realize this compensation due to the structure of the foam layer Function.

Because of the corresponding adjustments to the printing operation, i.e. the determination of the functional distance between the printing blanket cylinder 12 and the counter-pressure cylinder 15, or because of the selection of different foam layers for the substrate 100' configured as a printing cloth pad, the Existing printing units can be used for substrates with uneven surfaces and widely varying qualities. For relatively easily compressible substrates such as corrugated cardboard 14' shown in the second embodiment of Figs. of.

The thickness of the substrate 100 ′ configured as a printing cloth pad is important for good function and the necessary print quality. Fundamentally, substrates 100' having a thickness of about 0.5 mm to about 3.00 or 4.00 mm are contemplated for use. With known printing substrate application techniques, a substrate 100' having a thickness of about 1.00 millimeters to about 2.00 millimeters is preferred. In the case of foam materials, foam materials that are reversibly compressible over many cycles of action are preferred. Here, an open-celled foam material is preferably used. The foam material is more compressible than closed-cell layers in known printing cloths.

The special printing cloth 13, 70 is preferably formed from a common printing cloth, since the base layer 17' can also be embedded in the printing cloth. The open-cell foam is preferably placed on an existing non-stretch weave layer or on a differently configured base or carrier layer of the printing cloth. The active layer 13' can also be reapplied to the foam material. In this way we obtain the advantage that the flexibility in the lateral direction of the stretched surface of the special printing cloth 70 is considerably increased with respect to the resistance to tension still inherent in the special printing cloth 70 compared to common printing cloths, Especially in its active layer 13' (FIG. 4).

Simple modifications can be made to the operation of the specialized printing cloth 70 since only a portion of the common printing cloth is laminated to the substrate 100' or to the underlying layer. Also, a portion of the underweave layer, which provides tensile strength to the printing cloth, can be removed from common printing cloths. In this way, the dimensional stability of the printing cloth in the active area can be sufficiently ensured. A printing cloth which is rendered rigid transversely of the active plane in this way can be applied as an active layer 13' to the substrate 100' or to the underlying protective layer 16'. In this way, a special printing blanket 70 of the type described above can be produced in a simple manner and can be tensioned on the printing blanket cylinder 12 in an equally simple manner.

Furthermore, in the region of the clamping edge of the special printing cloth 70, a reinforcement can be provided, so that both the clamping and the use of the special printing cloth 70 during the printing operation can be improved. Here, the special printing cloth 70 is flattened at its ends to a thickness suitable for the clamping means in the printing blanket cylinder 12 after the active layer 13' and the lower layer have been installed. The clamping ends thus produced may also have reinforcements in the form of metal rods or other suitable reinforcements in order to avoid negatively affecting the protection layer 16' from substances in the printing process penetrating into the foam material, dedicated The front edge of the gripping end of the printing cloth 70 may have a sealant. As such, the specialized printing cloth 70 is shown to contain a bulky active area formed by the flexible active layer 13' with an appropriately compressed underlying layer. Otherwise, however, the special printing blanket 70 can be stretched over the printing blanket cylinder 12 in the same way as a conventional printing blanket of known thickness.

The structure of the bulky special printing cloth 70 can vary widely, so that the raw material (common or other printing cloth, lower or intrinsic layer of open-cell foam) and its structure constitute general conditions. Known conventional means can be used to achieve the connection between the active layer 13' and the non-stretch base layer 17', or between the active layer 13' and the last additional common carrier layer used to produce the special printing cloth 70 for printing. Embedding of foam material in cloth.

Claims (29)

1. base material (100; 100 '), it

-be used for printing stencil, especially flat-die version or forme (11), especially flat stamping version, and/or

-be used for printing with cloth (13; 70), blanket especially, particularly compressible or incompressible blanket, and/or

-be used in printing process especially offset printing process participating in another surface of printing operation,

It is characterized in that described base material (100; 100 ') be designed to a removable compound (16,17,18; 16 ', 17 '), it can give printing stencil or forme (11) and/or printing cloth (13 with respect to being equipped with; 70) and/or other participate in cylinder (10,12, the 15) strain diametrically on the surface of printing operation, or can be with respect to the cylinder that matches strain diametrically.

2. base material (100 as claimed in claim 1; 100 '), it is characterized in that described compound (16,17,18; 16 ', 17 ') be constructed to securable liner, especially securable printing stencil liner or forme liner, and/or be configured to securable printing cloth liner.

3. base material (100 as claimed in claim 1 or 2; 100 '), it is characterized in that described compound (16,17,18; 16 ', 17 ') by at least one compressible stratum (16,18; 16 ') and at least one incompressible stratum (17; 17 ') constitute.

4. base material (100 as claimed in claim 3; 100 '), it is characterized in that described compressible stratum (16,18; 16 ') being constructed to one can reverse compression function layer.

5. as claim 3 or 4 described base materials (100; 100 '), it is characterized in that described compressible stratum (16,18; 16 ') make by poromerics, preferably have perforate, especially by foam, particularly make by polyurethane foam.

6. as any one described base material (100 among the claim 3-5; 100 '), it is characterized in that described compressible stratum (16,18; 16 ') thickness be about 0.5 millimeter to about 3 millimeters, especially about 1.2 millimeters to about 1.6 millimeters.

7. as any one described base material (100 among the claim 3-6; 100 '), it is characterized in that described base material (100; 100 ') comprising at least two compressible stratums (16,18), it preferably has

-different structure and/or

-different thickness.

8. as any one described base material (100 among the claim 3-7; 100 '), it is characterized in that described incompressible stratum (17; 17 ') be constructed to the plate or the film of carrier layer, the especially dimensionally stable of dimensionally stable.

9. as any one described base material (100 among the claim 3-8; 100 '), it is characterized in that described incompressible stratum (17; 17 ') comprise at least a plastics, preferably polyester.

10. as any one described base material (100 among the claim 3-9; 100 '), it is characterized in that described base material (100; 100 ') comprising at least two incompressible stratums (16,18), it preferably has

-different structure and/or

-different thickness.

11. as any one described base material (100 among the claim 1-10; 100 '), it is characterized in that described base material (100; 100 ') comprise at least one the layer

-by jointing material make and/or

-by packing material make and/or

-make by auxiliary material.

12. as any one described base material (100 among the claim 1-11; 100 '), it is characterized in that thickness is about 0.5 millimeter to about 4.00 millimeters, especially about 1.5 millimeters to about 2.5 millimeters.

13. a printing equipment, especially offset printing device are used to have the printing of the printable fabric on special out-of-flatness surface, are preferred for the printing of paper or cardboard, it has

-one plate cylinder (10), tensioning has an especially flat-die version of a printing stencil on it, or a forme (11), especially a flat stamping version;

-one printing blanket cylinder (12), it on tensioning have one in extension plane size stable printing usefulness cloth (13), especially blanket basically, particularly compressible or incompressible blanket; And

-one counter-pressure cylinders (15),

It is characterized in that plate cylinder (10) and/or printing blanket cylinder (12) and/or counter-pressure cylinders (15) and/or other surface that participates in printing all scribble at least one described base material (100 among one deck such as the 1-12 in its surface; 100 ').

14. printing equipment as claimed in claim 13 is characterized in that, printing has a smooth basically surface with cloth (13), and/or can be in the transversely distortion of extension plane but only can mild compression.

15. printing cloth, be used at the irregular printable fabric of offset printing unit print surface with plate cylinder, printing blanket cylinder and counter-pressure cylinders, one of them in its extension plane basically the printing of dimensionally stable with cloth open by tightly the printing blanket cylinder on, described printing has smooth surface with cloth, and can be in the transversely distortion of its extension plane

It is characterized in that,

The special use printing cloth (13 of a large volume is set like this; 70), promptly a flexible active layer (13 ') that makes progress in printing blanket cylinder (12) footpath is positioned on its outside that participates in printing operation, and an elastically deformable layer (16) that directly or indirectly link to each other with described active layer (13 '), that preferably made by the perforate elastomeric material is positioned at it on the inboard of printing blanket cylinder (12).

16. printing cloth as claimed in claim 15, it is characterized in that, described elastically deformable layer is constructed to a securable laying, its carrier layer and with a dimensionally stable be positioned at above it can reverse compression functional layer, and below active layer (13 '), be permanently connected.

17. as any one described printing cloth in claim 15 and 16, it is characterized in that, described elastically deformable layer is constructed to a laying, its as one can reverse compression functional layer be positioned between the carrier layer of following and dimensionally stable of active layer (13 ').

18., it is characterized in that a kind of incompressible or compressible blanket is set as active layer (13 ') as any one described printing cloth among the claim 15-17.

19., it is characterized in that special-purpose printing cloth (13 as any one described printing cloth among the claim 15-18; 70) carrier layer is a laying, be made up of a kind of film of dimensionally stable, and functional layer is made up of a kind of foamed material.

20. printing cloth as claimed in claim 19 is characterized in that, a kind of common blanket is set to special-purpose printing cloth (13; 70) active layer (13 '), it is at special use printing cloth (13; 70) carrier layer of dimensionally stable is weakened diametrically with respect to the position on printing blanket cylinder (12) in the extension plane.

21. printing cloth as claimed in claim 20 is characterized in that, a kind of common blanket with carrier layer of a plurality of layers of composition is set to special-purpose printing cloth (13; 70) active layer (13 '), wherein its carrier layer is weakened, and about one or several knitted layer.

22. as any one described printing cloth among the claim 15-21, it is characterized in that, be set under the laying as special-purpose printing cloth (13 by layer one deck of forming of knitting of common printing at least with cloth; 70) carrier layer.

23., it is characterized in that the thickness of described deformable layer is the 0.5-3 millimeter as any one described printing cloth among the claim 15-22.

24. printing cloth as claimed in claim 23 is characterized in that the thickness of described deformable layer is preferably the 1.2-1.6 millimeter.

25., it is characterized in that special-purpose printing cloth (13 as any one described printing cloth among the claim 15-24; 70) clamp the end at it and flattened like this, can equally be stretched on the printing blanket cylinder (12) with cloth with common printing to the thickness of common printing with cloth.

26. printing cloth as claimed in claim 25 is characterized in that, special-purpose printing cloth (13; 70) be provided with reinforcement respectively in its pinching end portion, be used for clamping at the clamping device of printing blanket cylinder (12).

27., it is characterized in that special-purpose printing cloth (13 as any one described printing cloth in claim 25 and 26; 70) in the zone of elastically deformable layer, be provided with one at least in its clamping end and prevent to print the sealant of auxiliary agent infiltration.

28. be used for the device of the irregular printable fabric of print surface, it has a plate cylinder, a printing blanket cylinder and a counter-pressure cylinders, wherein printing stencil preferably flat stamping brush masterplate be stretched on the plate cylinder, in addition, one in its extension plane basically the printing of dimensionally stable with cloth be stretched in the printing blanket cylinder on, described printing also can is characterized in that in the transversely distortion of extension plane with the cloth smooth surface

One has preferably the special-purpose printing of large volume of layer of the elastically deformable of being made by open-cell foam materials with cloth (13; 70) be stretched on the printing blanket cylinder (12).

29. method by the irregular printable fabric of device print surface as claimed in claim 28, it is characterized in that image to be printed is by means of being stretched in printing blanket cylinder (12), having preferably the special-purpose printing cloth (13 of large volume of the elastically deformable layer of being made up of open-cell foam materials; 70) transfer on the printable fabric through plate cylinder.

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