DE102007031001A1 - Sheet- - Google Patents

Abstract

The invention relates to a sheet-fed rotary printing press and to a production method for laminated or laminated printed products. The sheet-fed rotary printing machine has at least one printing unit (A) and a finishing unit (B) for laminating or lamination of printed sheets, which includes a press nip (12) in which the laminating or laminating film (7) is applied to the printing sheet. In order to improve the surface properties of the printed product, it is provided that one or more further embossing rollers (6, 13) act under pressure on the laminated or laminated printed sheet in the sheet conveying direction after the press nip (12) and thus at least reshape the surface of the laminated or laminated printing material effect on its surface.

Description

The The invention relates to a sheet-fed rotary printing machine with a Apparatus for laminating or laminating printed products after Preamble of claim 1.

In the EP 0 569 520 B1 a cold foil transfer method for use in printing machines is disclosed. In this case, a sheet-processing printing machine is shown, which has a feeder and a boom, wherein printing units and coating units are arranged between the two units. In at least one of the printing units, an adhesive pattern is applied by means of the planographic printing process. This adhesive pattern is applied in a cold printing process and has a specific image-giving subject. In the printing unit following coating unit with a counter-pressure cylinder and a press roller a film guide is provided. This is designed in such a way that from the film supply roll, a film strip or a transfer film is passed through the nip between the impression cylinder and press roll.

At the Transporting the sheets through the printing unit is done with each sheet Provided adhesive pattern. Thereafter, the sheet is through the coating plant guided, wherein by means of the press roller on the impression cylinder resting printed sheet associated with the film material becomes. It goes down, usually metallic layer a close connection with the areas provided with adhesive one. After the further transport of the printing sheet the transferred one adheres Layer only in the area provided with the adhesive pattern at. The carrier film is therefore only the transfer layer in Removed range of adhesive patterns. The used in this way transfer film will be wound up again. It is known such coating units to use for example in printing units of printing presses. It is also known as a press roller, for example, the blanket cylinder or insert printing cylinder of a printing unit.

With Such a cold foil transfer system can only be relatively thin Layers up to a few microns transferred to a substrate. These layers are covered by the transfer film through the adhesive, the is on the substrate, detached and on the Transfer printed sheet. The transfer or transfer done piecewise, so that the transferred layer is not completely closed resting on the sheet. These Layer can also have microcracks that make the visual impression Do not disturb, but the transferred film on the sheet interrupt. Also, the transferred movie is interrupted when the adhesive applied by the preceding printing unit disturbances, For example, by paper particles, also called Butzenbildung has. The thin layer thickness and the listed disturbances and interruptions of a cold foil transfer process Films leave the suitability of such a film for applications in which barrier properties, such as water vapor impermeability or a moisture barrier is required, not to. Very pretty small, exposed fibers from the paper surface act like a wick, moisture or other liquid substances sucks into the interior of the printing material.

It is also known to coat printed signatures in a sheet laminating machine with a closed film of a plastic material. In this case, a stream of individual signatures is usually laminated by a roll with a continuous film, after lamination, the individual sheets are separated again by a separation technique. The separation can be done by weakening the film at the joints between the individual sheets by tearing off the film. But there are also known solutions in which the film is cut through. Such Bogenkaschieranlagen are in the patents DE 198 17 835 C2 . DE 44 12 091 A1 . DE 43 36 835 C1 and DE-PS 1 194 562 listed.

With such continuous laminations can be high gloss values, but also achieve barrier properties. A coated with a plastic film For example, printed cardboard can then be used as outdoor advertising be used. Also, such types of coatings are often required for use in frozen packaging as a moisture barrier or as a packaging of aggressive Fats as a grease barrier, for example, for packaging fatty animal feed is required.

The laminated layer can also fulfill decorative purposes, z. B. as a metallic coating or effect and security coating (eg a foil provided with holograms). The laminated layer can also be used as reinforcement of the carrier material added, for example, the tear strength to increase a packaging.

Embossing in printing presses is well known from various patents. In the patent DD 474 365 an embossing process is described in which is embossed between the form and impression cylinder. The die is mounted on the forme cylinder. The male is attached to the opposite pressure cylinder.

In the in the patent publication EP 1 002 213 A1 described embossing method, the impression cylinder of a sheet-fed offset printing machine ne provided with a conventional engraved printing plate (die with engraving depth 0.1-0.2 mm). The opposite blanket cylinder is z. B. 100 g / m ² strong blotting paper (eg, with double-sided adhesive tape), on the blanket cylinder and elevations can be applied. After the first pass, the blotter forms the patrix (non-embossing areas are cut out). The embossing takes place in the nip between impression cylinder and blanket cylinder.

The patent publication DE 10 2004 058 601 A1 represents an embossing process that converts sheet or web-shaped substrates between two rotating rolls. The two rotating rollers are provided with tool parts. The patroller acts on the corresponding die roller and thus characterizes the stamped product passed through. Embossing applications in printing presses are in addition to the cited documents known in other forms.

task The invention is different optical effects, a haptic detectable film surface and a good bondability to reach a packaging.

These The object is solved by the features of claim 1.

meaningful Further developments emerge from the subclaims.

According to the invention the film from the laminating or laminating as a closed film Applied to the sheet by removing the film from a supply roll unwound and placed in a press nip on the sheet that is on the impression cylinder rests, is ironed. To Reaching the required section length becomes the film is torn off or cut off.

According to the invention a matte effect in the surface of the laminating or laminating film achieved by a shiny laminated / laminated on the sheet Film in its surface topography by an embossing process partially or flatly changed, that she appears dull. The stamping plate or embossing roll has a fine structure, which then in the composite of Printed product and laminated / laminated film is embossed.

in the The invention will be exemplified with reference to drawings shown.

Here in demonstrate

1 a first device for laminating or laminating and

2 a second device for laminating or laminating.

According to 1 and 2 is in a sheet-fed rotary printing machine, preferably sheetfed offset printing machine, a printing unit A provided with a cylinder plates 3 a rubber cylinder 4 and an impression cylinder 1 is provided. Furthermore, a processing plant B for laminating or lamination of sheet is provided. The finishing plant B consists of a press roll 5 and another cylinder, which has a press nip 12 form. In the press nip 12 becomes a laminating or laminating film 7 applied to the sheet. The laminating or laminating film 7 is in an unwinding from a supply roll 8th handled as a film web. In the coating process, no film is rewound after the lamination or laminating process. On the other hand, the film web by a separator 11 divided into film sections that are completely connected to the sheet.

The film is applied by the laminating or laminating as a closed film on the sheet by the film from a supply roll 8th unwound and then in the press nip 12 between a press roll 5 and the impression cylinder 1 on the printing sheet, on the impression cylinder 1 rests, is ironed on. After reaching the required section length, the film is torn off or cut off. Characteristic of the invention is that the entire film remains on the substrate and further transported with the sheet and no carrier film, such as in the cold foil transfer process, is wound up again.

The flat on the sheet transferred foil can the printed sheet entirely or only in some areas of the sheet format. As an example of a partial Lamination / lamination of a printed sheet is the recess of the Gripper edge at the beginning of the sheet lead.

A Extension of the section length of the laminating / laminating film over the sheet format is quite a useful application. Especially in the The area of the format cut of the film can be the flatness of the film or the surface quality through the cut and restricted the associated web tension loss be. For example, the foil can easily snap back onto the bow, which leads to limitations of gloss and flatness the laminated / laminated layer can come. By changing the section length selects something bigger than the sheet format this can be bypassed. The printed image remains even until the end of the sheet covered.

The transfer of the laminating or laminating film takes place in the press nip 12 between press roll 5 and impression cylinder 1 , According to the invention, the laminated or laminated film is rolled over after the press nip by a further roller, which performs a mechanical surface treatment of the laminated / laminated film surface and optionally also the composite of laminated / laminated layer with the printed sheet.

Laminated / laminated Foils generally have a uniform gloss. films can all degrees of gloss between a dull appearance and have a high gloss appearance. In but in most cases slides are shiny be. It is often desirable in the printing industry to achieve a matte / gloss effect, which in its contrast effect the print product looks livelier and one achieved high desired attention value.

According to the invention Achieved a matte effect by putting a shiny on the press sheet laminated / laminated film in its surface topography partially or even flat by an embossing process is changed so that it appears dull. The stamping plate or embossing roll has a fine structure, the then in the composite of printed product and laminated / laminated Film is imprinted. The embossing depth is thereby usually rather low, leaving only the laminated / laminated Foil is embossed. The reverse process is also conceivable by a matte film by a stamping process partially or flatly smoothed. This process approach but is useful in most cases, since slides mostly are equipped with a shiny surface.

It is also often common printed products with a high / low embossing equip. On the one hand, this can serve advertising purposes by: For example, a logo is embossed. This is then optical and Haptically better to capture and conveys a high value of the printed product. The embossing can also be functional Have character, for example in the form of a tactile braille Braille or in a hard to adjust security stamping. In the case of the embossing forms, a distinction is made between the high and low and the high-low stamping. The embossing is Embossing of substrates, where an increase on the front of the material by introducing a recess is generated in the material back. The stamping is a stamping die with the embossing error! Bookmark not defined. Stamping of substrates is created by a depression on the front of the material. The high / low embossing is a combination of both Päge forms dar. In the high or low embossing can with a stamping die with stamping patrix be worked, for example, against a cylinder, if necessary with a protective film or an apron against mechanical damage protected, acts. For the combined embossing / embossing Work a mold with stamping patrice with a corresponding Counterform, which has corresponding recesses die, together. The matrix can be clamped as a mold or by impression formed in a deformable material in the stamping mill become.

In a special expression, the inventive mechanical processing of laminated / laminated on the printed product Foil also be a perforation, for example, partially in the Printed product is introduced. Films can be mixed with many commercially available Adhesives do not stick very well and also the adhesion of the adhesive film is often not enough. Through a perforation of the closed or laminated film film, the adhesion of adhesives / adhesion promoters be improved. So it makes perfect sense Klebelaschen of To perforate packaging locally.

It may prove useful to use the embossing roller 6 . 13 when using a thermoplastic laminating or laminating film 7 to temper. As a result, not only the purely mechanical deformation but also thermoplastic deformation can be achieved. The temperature of the embossing roll 6 and or 13 can take place, in which the pressure roller is flowed through by a tempering fluid or gas. The tempering can also be done by an electric heater, or indirectly by induction or irradiation with a heat radiator.

The embossing roller 13 can be designed as a cylinder on which a stamping plate is clamped. In the case of the combined embossing / embossing carry in the embossing D both corresponding cylinder an embossing plate, wherein it is irrelevant in the context of the invention, which cylinder carries the die or male. The embossing roller 6 . 13 but can also be a solid roller having a surface structure.

at The embossing types are generally distinguished from the structure embossing from the pictorial imprint. The structure embossing indicates a uniform or uneven Pattern on, the partial or surface in the substrate is introduced. A structure embossing can be a a repetitive motif or a defined surface structure be. In the pictorial imprint a motif is embossed, that usually coincided with areas of the printed image is, for example, an embossed printed logo.

1

Impression cylinder

2

transferters

3

Printing form cylinder / plate cylinder

4

rubber cylinder

5

press roll

6

embossing roller

7

Sheet / cover / laminating

8th

supply roll

9

Dancer roller / dancer roll set / latch

10

fixing

11

Cutting / separating device

12

press nip

13

embossing roller

V1

Oberfächengeschwindigkeit the film web

V2

surface velocity the press roll

A

printing unit

B

finishing work

C

boom

D

stamping

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 0569520 B1 [0002]
• - DE 19817835 C2 [0005]
• - DE 4412091 A1 [0005]
• - DE 4336835 C1 [0005]
• - DE 1194562 [0005]
• - DD 474365 [0008]
• - EP 1002213 A1 [0009]
• DE 102004058601 A1 [0010]

Claims (13)

Sheet-fed rotary printing machine, preferably sheetfed offset printing press, with at least one printing unit (A) with plate cylinder ( 3 ), Rubber cylinder ( 4 ) and impression cylinder ( 1 ) and a finishing plant (B) for laminating or lamination of printed sheets, comprising at least one press roll and a further cylinder having a press nip ( 12 ) in which the laminating or laminating film ( 7 ) is applied to the printing sheet, and an unwinding device with a supply roll ( 8th ) from which the film web is unwound, wherein no film is wound up again after the laminating or laminating process and the film sections formed by a separating device remain connected to the printed sheet, characterized in that in the sheet conveying direction after the press nip ( 12 ) located between the press roll ( 5 ) and the impression cylinder ( 1 ) is formed, one or more further embossing rollers ( 6 ; 13 ) acts or acts under pressure on the laminated or laminated printing sheet and thus causes a reshaping of the surface of the laminated or laminated substrate or of the printing material surface, Sheet-fed rotary printing machine according to claim 1, characterized in that the downstream embossing roll ( 6 ; 13 ) is designed as a solid roller and that the surface carries an embossed structure. Sheet-fed rotary printing machine according to claim 1, characterized in that the downstream embossing roll ( 6 ; 13 ) bears an embossing plate, which by clamping devices or magnetically on the embossing roller ( 6 ; 13 ) is fixed. Sheet-fed rotary printing machine according to claim 1, 2 or 3, characterized in that the embossing roller ( 13 ) or the stamping mold are part of a separate stamping mill (D). Sheet-fed rotary printing machine according to claim 1, 2 or 3, characterized in that the embossing roller ( 6 ; 13 ) or the mold is tempered, Sheet-fed rotary printing machine according to claim 5, characterized in that the tempering of the embossing roll ( 6 ; 13 ) takes place by the embossing roll is flowed through by a tempering fluid or a tempering gas, Sheet-fed rotary printing machine according to claim 5, characterized in that the tempering of the embossing roll ( 6 ; 13 ) or the embossing mold indirectly by a heat radiator, such as an IR radiator, for irradiating the embossing roll ( 6 ; 13 ) or the embossing mold or a device for generating an induction effect at least on the surface of the embossing roll ( 6 ; 13 ) or in the embossing mold is provided. Sheet-fed rotary printing machine according to claim 1 to 5, characterized in that the embossing roller ( 6 ; 13 ) or the embossing mold at least partially or completely over the entire surface have a structured surface. Method for producing a matt / gloss effect on a foil-laminated / laminated printing sheet using a sheet-fed rotary printing press, preferably a sheetfed offset printing press, with at least one printing unit (A) with plate cylinder ( 3 ), Rubber cylinder ( 4 ) and impression cylinder ( 1 ) and a finishing plant (B) for laminating or lamination of printed sheets, comprising at least one press roll and a further cylinder having a press nip ( 12 ) in which the laminating or laminating film ( 7 ) is applied to the printing sheet, and an unwinding device with a supply roll ( 8th ) from which the film web is unwound, wherein no film is wound up after the lamination or lamination again and the film sections formed by a separator remain connected to the sheet, according to claim 1, characterized in that areas of the laminated / laminated glossy film or the entire film by an embossing roller ( 6 . 13 ) or an embossing mold are deformed so that they subsequently appear dull, Method for producing a matt / gloss effect on a foil-laminated / laminated printing sheet using a sheet-fed rotary printing press, preferably a sheetfed offset printing press, with at least one printing unit (A) with plate cylinder ( 3 ), Rubber cylinder ( 4 ) and impression cylinder ( 1 ) and a finishing plant (B) for laminating or lamination of printed sheets, comprising at least one press roll and a further cylinder having a press nip ( 12 ) in which the laminating or laminating film ( 7 ) is applied to the printing sheet, and an unwinding device with a supply roll ( 8th ) from which the film web is unwound, wherein no film is wound up after the lamination or laminating again and the film sections formed by a separator remain connected to the sheet, according to claim 1, characterized in that areas of the laminated / laminated matte film or the entire film by an embossing roll ( 6 . 13 ) or embossing mold are smoothed so that they subsequently have a higher degree of gloss, A method of producing a pictorial embossment on a sheet laminated / laminated sheet using a sheet rotation Printing machine, preferably sheetfed offset printing press, with at least one printing unit (A) with plate cylinder ( 3 ), Rubber cylinder ( 4 ) and impression cylinder ( 1 ) and a finishing plant (B) for laminating or lamination of printed sheets, comprising at least one press roll and a further cylinder having a press nip ( 12 ) in which the laminating or laminating film ( 7 ) is applied to the printing sheet, and an unwinding device with a supply roll ( 8th ) from which the film web is unwound, wherein no film is wound up again after the laminating or laminating process and the film sections formed by a separating device remain connected to the printed sheet, according to claim 1, characterized in that by means of an embossing roll ( 6 . 13 ) or an embossing form is a high or low embossing, A method according to claim 11, characterized in that by the embossing roll or embossing rolls ( 6 . 13 ) or by the embossing plate or embossing plates is a high / low embossing using the die and male mold, A method according to at least one of claims 9 to 12, characterized in that to improve the adhesiveness of adhesive surfaces of a laminated or laminated printed product, using a sheet-fed rotary printing press on the surfaces to be glued in subsequent processing steps, such as in a folding box gluer laminated or laminated Film partially or completely through the embossing roll ( 6 . 13 ) or the stamping die is perforated to ensure better adhesion of the bonding agent.