DE102017202306B3 - Process for processing printing material - Google Patents

Abstract

The invention relates to a method for processing of printing material, wherein the printing material is provided with a printed image, wherein the printing material is provided with a paint, wherein the paint is at least locally removed.

Description

The invention relates to a method for processing printing material according to the preamble of claim 1.

In folding carton production as well as corrugated board production (generally: packaging), a high percentage of dispersion lacquer (water-based lacquer) or UV lacquer is applied. Reasons for the paint job are z. As the protection of the packaging from mechanical stress ("scratches") or the protection of the package from moisture. The color intensity is increased by a paint job, which produces a sales-promotional effect.

It should be noted, however, that in the production of the packaging material splices must not be covered with varnish (dispersion or UV) since standard adhesives do not have sufficient adhesion to the varnished surfaces. Barcodes / QR codes must also be paint-free, because the application of paint (dispersion or UV) hinders the readability of the codes.

In today's conventional printing process, e.g. Offset or flexographic printing, the coating of the packaging material is no problem, because the printing forms are not dynamically ("flying") to be changed. Therefore, in the case of a print job change, the corresponding paint plate is exchanged, are left on the splices and barcodes or QR sites. As a rule, coated offset papers or cardboard boxes with and without a line (GD cardboard) are used.

In digital printing (non-impact printing, especially ink-jet), varnishing is a problem because a USP (Unique Selling Proposition) of digital printing is the flying change of printing forms. Since a conventional printing unit would nullify this USP of digital printing, there is only the approach here, the entire sheet of prints flat, d. H. without recesses, to paint - and in the later box production either with plasma units to optimize the surface tension for glue traces or to use special, expensive adhesives.

The US 2015/0243020 A1 discloses a method in which paint is removed by laser.

A proposed method is to partially remove the lacquer on splices and / or barcode locations by means of a laser (for example as a grid) or completely.

The invention has for its object to provide a method for processing of printing material.

The object is achieved by the features of claim 1.

The achievable with the present invention consist in particular that the removal of printing varnish and / or paper coating by laser bombardment, controlled variably in the flying change of print jobs, inline, offline or nearline can be done.

Another advantage is that no separate printing units (conventional or digital) are required for the impression of UV and emulsion paints.

Another advantage is the cost reduction by avoiding printing plates and the associated pre-press processes.

Another advantage is that the process advantages of digital printing systems for the production of spot-paint applications can be maximized.

Another advantage is the minimal variable costs that result from the use of a laser system.

Another advantage is the use of standard adhesives / glue in elevators, folding carton gluing systems or the production of corrugated cardboard packaging.

The longer availability of punching forms / waste forms / cleaning forms - since these are present in the database - is also advantageous.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

• 1 Querschnitt eines Druckproduktes mit Lackschicht;
• 2 Querschnitt eines Druckproduktes mit per Laser entfernter Lackschicht und Leimauftrag;
• 3 Querschnitt eines Druckproduktes mit per Laser gitterartig entfernter Lackschicht und Leimauftrag;
• 4 Querschnitt eines Druckproduktes mit per Laser entfernter Lack- und Strichschicht und oberflächlicher Einfärbung des Bedruckstoffes.

Show it:

• 1 Cross section of a printed product with lacquer layer;
• 2 Cross-section of a printed product with laser-removed lacquer layer and glue application;
• 3 Cross-section of a printed product with laser-like removed lacquer layer and glue application;
• 4 Cross-section of a printed product with laser-removed paint and coating layer and superficial coloring of the printing substrate.

Is shown in 1 a cross section of a printed product with a coating layer. The cutting area is between a printed area 01 and a non-printed area 02 , As in 1 shown, is the substrate 03 in the printed Area 01 with a paper stroke 04 , at least one printing ink 06 , in particular a printed image 06 , and a paint 07 , in particular a pressure varnish 07 (Dispersion or UV) provided. Preferably, the entire print image 06 with a layer of paint 07 provided, which is preferably painted with an uninterrupted paint form.

The non-printed area 02 is different from the printed area 01 by the missing ink 06 or the missing print image 05 , A printed image 05 is in the unprinted area 02 not required because of the unprinted area 02 preferably as a splice 02 serves.

Above the non-printed area 02 is at least one laser 08 arranged with a wavelength N, with which the paint 07 at least in places from the substrate 03 and / or the paper stroke 04 Will get removed.

The printed image 05 has cartons, whereby by the process of lacquer 07 at the splices 02 the cartons are removed and the splices 02 then with adhesives 09 be provided.

Particularly preferred is the printed image 05 at least one coding, in particular a barcode or QR code, on.

Like in the 2 to see was by means of the laser 08 the paint 07 on the paper line 04 in the area of the splice 02 completely from the printing varnish 07 away. adhesive 09 were on the paper stroke 04 applied.

In a further embodiment ( 3 ) is done by means of a laser 08 the paint 07 only in selected places 02 in the area of the splice 02 removed and after removing the paint 07 to the paint 07 exposed areas 02 at least partially adhesive 09 applied.

The vacancies 02 are generated for example by a so-called "distance grid". This will make the paint 07 via laser 08 not completely from the splice 02 removed, but it remains pressure varnish residues 11 on the surface of the paper stroke 04 or the surface of the printing substrate 03 receive. The standard glue / glue 09 is then applied to the lattice-like paint-free surface. By this type of paint removal, it is possible to increase the throughput of packaging.

By removing the paint, it is now possible to use conventional standard glue in the folding box / "erector" for folding cartons or corrugated cardboard packaging.

Preferably, the laser exposure system is controlled by data from the prepress, in particular by the RIP data of the printing system.

As in 4 represented by the laser 08 both the print varnish 07 as well as the paper stroke 04 from the substrate 03 be replaced. By the replacement of the paper line 04 is an even better adhesive effect achievable. For example, this also gives the possibility of superficial coloring 12 of the printing material 03.

Not shown in the figures, that when changing the applied by a non-impact printing process printed image 05 a change in the position of the paint 07 distant places 02 he follows.

The following example illustrates the installation of the laser-varnish and / or paper-line removal in the workflow:

A fully variable control with flying change of paint / paper coating removal via laser 08 is possible from a precursor RIP / workflow, for example, by adopting the imposition or RIP data from the prepress or RIP printing system. An installation of the laser 08 is particularly possible inline with a printing system. For example, installation of the laser is possible near or independently besides a printing system.

Preference is given to installing the laser in conjunction with an inline extraction system for odor or potential avoidance of pollutant emissions.

LIST OF REFERENCE NUMBERS

01

printed area

02

unprinted area; Job; splice

03

substrate

04

paper coating

05

print image

06

printing ink

07

Paint; printing ink

08

laser

09

Adhesives; Standard adhesive; Standard glue

10

-

11

Overprint varnish rest

12

Coloring, superficial

Claims (8)

Method for processing printing material (03), the printing material (03) being provided with a printed image (05), the printing material (03) being provided with a lacquer (07), the lacquer (07) being removed at least in places, characterized in that the lacquer (07) is removed at points (02) provided for adhesion, that after removing the lacquer (07) at least partially adhesive (09) is applied to the areas (02) exposed by the lacquer (07) and that the printed image (05) has folding boxes. Method according to Claim 1 , characterized in that the paint (07) by means of at least one laser (08) is removed. Method according to Claim 1 or 2 , characterized in that at least the entire printed image (05) is provided with a lacquer (07). Method according to Claim 1 . 2 or 3 , characterized in that the printing material (03) is painted with an uninterrupted paint form. Method according to Claim 1 . 2 . 3 or 4 , characterized in that the printed image (05) has at least one coding. Method according to Claim 1 . 2 . 3 . 4 or 5 , characterized in that the paint (07) at the splices (02) of the cartons is removed and the splices (02) is then provided with adhesives (09). Method according to Claim 1 . 2 . 3 . 4 . 5 or 6 , characterized in that in addition to the paint (07) paper coating (04) is removed. Method according to Claim 1 . 2 . 3 . 4 . 5 . 6 or 7 , characterized in that when changing the applied by a non-impact printing process printed image (05), a change in the position of the paint (07) remote locations (02) takes place.

Images