RU2483933C1 - Method to manufacture printed matter and printed matter - Google Patents

Abstract

FIELD: printing industry.

SUBSTANCE: invention relates to printing industry and may be used to manufacture magazines, congratulatory, executive, advertising and packaging products. The method to manufacture printed matter includes application of a metal layer onto a section of the paper medium surface, correspondent to the image fragment, and subsequent printing of the specified image, including solid printing of the metal layer on the specified section with colour dyes. The surface of the paper medium is impregnated with an antistatic before application of the metal layer, which, in its turn, prior to printing, is treated with corona discharge.

EFFECT: increased strength of metal layer adhesion with printed medium surface, improved quality of printing and production of original light effects on a printed metallised surface.

7 cl, 2 dwg

Description

FIELD OF THE INVENTION

The invention relates to printing and can be used in the manufacture of magazine, congratulatory, representative, advertising and packaging products.

State of the art

A known method of manufacturing printed products, including applying paint with the effect of the appearance of the metal by rolling rollers in the intaglio printing section (see patent RU 2304049, IPC B44C 1/24, B41M 1/10, publ. 10.08.2007). The use of metallic paints to make the image more attractive and to give the impression a metallic effect is a widespread method due to the simplicity of its implementation. However, this method does not allow to achieve a significant surface gloss.

Known methods for the manufacture of printed printing products, including applying to a medium (paper, polymer, sheet or roll) a printed image and subsequent hot stamping with foil pressed onto the medium by means of a heated cliche (see, for example, patent RU 2248887, IPC B44C 1/17, published March 27, 2005; or patent RU 2196684, IPC B44C 1/24, published January 20, 2003; or patent RU 2243905, IPC B44C 1/24, published January 10, 2005).

A known method of manufacturing printing products, in which foil stamping is carried out the so-called "Cold" way, without high temperature exposure. The foil is rolled onto a material on which a pattern is applied in the printing section of the machine in the form of a layer of an adhesive photopolymer polymerizing under the influence of UV radiation (patent for invention RU 2174070, IPC B41M 1/22, publ. September 27, 2001).

There is a method of providing images on a substrate, which consists in the fact that the formation of a metal image is carried out by depositing a metal powder on an adhesive deposited on paper, followed by embossed embossing of the structure with a heated element (see patent for invention RU 2207960, IPC B41M 3/14, publ. July 10, 2003).

The use of real metal in the form of foil or powder makes it possible to achieve high attractiveness of printed matter, which is distinguished by a bright shine of metal elements, the surface of which can be embossed. However, in all of the above solutions, the deposition of a metal image is carried out after printing, as a finishing operation at the final stage of manufacture. The color of the metal element is determined by the type of metal used, as a result of which the color scheme is limited to colors such as silver, gold, bronze.

Recently, in the printing industry, a method has been spread in which metallization is carried out before printing, and subsequent sealing of the metallized surface allows to obtain a wide variety of color combinations with a bright metallic sheen (see materials on the Internet, Yandex search engine, http: // www. bazilprint.ru/services/metalefects.php and http://www.brandmedia.ru/serv_idP_5_idP1_1070.html, prints are attached).

A similar printing method is also implemented during the operation of the device disclosed in patent RU 60438 U1, IPC B44C 1/24, publ. January 27, 2007. The aforementioned method is adopted as the closest analogue for the proposed method for the manufacture of printed products. The method includes applying a layer of metal on separate parts of the surface of the paper carrier corresponding to the fragments of the image, which is printed after metallization, over the said areas with metallization.

However, with any method of applying metallization to the surface of a paper carrier, a problem arises of a lag of the metal layer from the surface of the carrier. Poor adhesion of the metal to the surface of the carrier is due to the electrification of the paper, which is inevitable during its movement, storage, stopping. Static electricity accumulated on the surface of the paper interacts with metal particles, preventing them from fixing on the surface. Usually this problem is solved by applying an additional adhesive layer under the metal or varnishing the surface on top of the metallization applied to it, which leads to additional costs, or use powerful equipment.

Another problem is offset printing on top of the metal layer.

Known printed products containing a paper base carrier with a metal image deposited on its surface by cold foil stamping (see patent RU 2174070, IPC B41M 1/22, publ. 09/27/2001).

As the closest analogue for the claimed technical solution of the printed product, a printed product containing paper carrier with at least one surface area successively coated with a metal layer and a paint layer was adopted (see materials of the Internet: http://www.bazilprint.ru /services/metalefects.php). The disadvantages of the mentioned printed products include its low quality, which is due to the same problems as the above regarding the method of manufacturing printed products.

Disclosure of invention

The problem to which the invention is directed is to improve the quality of printed products by increasing the strength of fixing the metal layer on the surface of the paper carrier, as well as by improving the quality of printing on metallized surfaces.

The problem is solved due to the fact that in the method of manufacturing printed products, including applying a metal layer on a surface portion of a paper medium corresponding to an image fragment, and subsequent printing of said image, including continuous sealing of a metal layer with colored inks on said portion, according to the claimed invention, the surface of a paper carrier impregnated with an antistatic agent before applying a layer of metal, which before printing is treated with a corona discharge.

The problem is also solved due to the fact that in a printed product containing a paper carrier with at least one surface area successively coated with a metal layer and a paint layer, according to the claimed invention, a sheet of paper or cardboard with an antistatic surface is used as a paper carrier and a layer of metal deposited on it, previously applying a layer of paint, is treated by corona discharge.

The above combination of distinctive features of both the proposed method and the claimed printed products allow to obtain the following positive technical results:

- increasing the strength of fixing the metal layer on the surface of the paper medium;

- increase the susceptibility (adhesive properties) of the surface of the metal layer to the applied paint;

- the appearance of new original lighting effects (play of colors) in the metallized areas of the color image.

Each of these positive results individually and all the results in the aggregate contribute to obtaining quality printed products.

The deposition of a metal layer on the surface of an object, the same as coating a surface with a thin layer of metal, is commonly called "metallization", therefore, for brevity, the term is used below along with the "deposition of a metal layer" used in the formula.

In the claimed solution, “metallization” and “deposition of a metal layer” means the whole set of actions associated with the formation of a metal layer on the surface of the carrier, and the metallization of the surface can be carried out by any known method, for example, by embossing, hot or cold, spraying, applying metal paste ( a mixture of metal powder and a binder).

The impregnation of the surface of the paper carrier with an antistatic agent, carried out before metallization, made it possible to remove the charge of static electricity from the surface of the carrier and provide the best conditions for fixing a metal layer on it. The antistatic agent is used in a form that provides uniform impregnation of the top layer of the paper carrier (its surface) to a certain thickness. It can be an aqueous or alcohol solution, gel, etc.

All samples of printed products made using antistatic surface treatment of the carrier were characterized by high-quality fixing of the metal layer: both the foil layer deposited by hot stamping and the layer of metal powder. Moreover, in the latter case, when the metal layer was deposited by sputtering, the formation of a uniform even layer in thickness and the formation of clear image contours were observed, which was previously unattainable without antistatic processing.

Antistatic agents are widely used, however, in the sources of information known to the applicant, it was not found that the surface of the paper was impregnated with an antistatic composition to better fix the metal layer on it.

The introduction of an antistatic treatment of the surface of the carrier before metallization allowed us to obtain another additional positive result, namely: to reduce the requirements for equipment and materials used for applying the metal layer.

The treatment of the surface of the metal layer with a corona discharge made it possible to improve its wettability and to provide better fixing of coloring substances on it.

Corona discharge is widely used for the processing of polymeric materials and films, and more recently, for the processing of paper and other media in order to improve the adhesion properties of a surface intended for sealing, which is usually the printing of any text information.

In contrast to the well-known sources of information in the claimed solution, corona treatment of the surface of the carrier together with subsequent application of a paint layer on this surface allowed not only the adhesion of coloring substances to the treated surface, but also to obtain new original lighting effects (color play) on metallized areas color image, which was not observed with similar printing without such processing.

The corona discharge field acts on the surface of the metal layer, forming some relief pattern on it. The resulting surface irregularities have different relief depths and the angle of inclination of the walls, which reflect the incident light in different ways, which leads to the appearance of the mentioned effects.

The ink applied by the offset printing method, filling the irregularities of the microrelief of the metal surface, forms an uneven thickness layer of paint, which also contributes to the formation of a particular effect. Selecting the treatment mode by corona discharge, it is possible to change the resulting relief pattern of the metal surface, while changing the resulting effect.

For corona treatment, known devices used for treating polymer surfaces can be used, such as, for example, disclosed in patents: US 5038036, IPC Н01Т 19/00, publ. 08/06/1991 g .; RU 2306224, IPC В29С 71/04, publ. September 20, 2007, etc.

The method has an advantageous application for paper media in the form of sheets of paper or thin cardboard.

The use of an antistatic agent in the form of an aqueous solution is preferred.

It is advisable to apply an antistatic composition by screen printing, and the equipment commonly used for this printing can be used.

Brief Description of the Drawings

The inventive method of manufacturing a printed product is illustrated by drawings, where in Fig.1 is an example of a printed product made according to the method, isometry; figure 2 is a section aa from figure 1.

The implementation of the invention

The manufacturing process of printed products using the proposed method includes the well-known steps of developing product design and preparing an electronic version, which, in contrast to conventional offset printing, includes two layouts: one corresponding to image fragments with metallization, the other for the image as a whole, and also manufacturing in accordance with the mentioned layout models for offset printing and for applying metallization. The above operations are not the subject of the invention, they are carried out using known technologies and equipment.

To make a mold for metallization, a magnesium plate can be used, on the prepared surface of which a copy layer is applied. An image is exposed to the latter and its development is carried out. The mentioned process is similar to the well-known process of making cliches - letterpress forms. In each case, the implementation of the proposed method, the manufacturing process of this form is determined by the used method of applying metallization.

A printed product made using the claimed invention, for example, a magazine cover, postcard, advertising booklet, contains (see drawings) a sheet of paper carrier 1 with one or more surface sections 2, successively coated with a metal layer 3 and a paint layer 4.

The manufacture of printed products is as follows.

The sheet of paper intended for sealing is placed in a screen printing machine, where its surface is coated with an aqueous solution of antistatic agent, using an empty frame as a screen. In this case, the antistatic agent uniformly impregnates the upper layer of the carrier to a certain thickness. The thickness of the impregnation can be adjusted using the methods used in screen printing.

As an antistatic agent, an aqueous solution of glycerol can be used, which is preferred, but does not limit the possibility of using another known antistatic agent.

After antistatic processing, metallization of the surface of the carrier is carried out using a prepared plate-form with image fragments. To do this, the plate-shape is fixed on the plate of a special device, the stops are installed and applied to the thinnest layer of metal on the surface sections corresponding to fragments of the future image.

For the manufacture of printed products in a specific example, silver powder was used as metal, which was sprayed onto the surface of a paper carrier.

The resulting sample is characterized by uniformly and clearly worked out image elements, the minimum value of the reverse relief, clean gaps between the image elements and the strength of the metal layer fixing on the surface of the carrier.

Metal fragments of the image are subjected to corona treatment, and then the surface of the medium is sealed by offset printing, ensuring the combination of the metallized areas of the image with the main image.

Corona treatment changes the surface structure of the metal, making it more susceptible to paint. In sealed corona-treated areas treated with a corona discharge, new original image lighting effects are observed that were not observed in similar printing without such processing.

The above example was carried out in real production. An example illustrates the essence of the claimed invention, but does not exhaust all cases of its specific implementation.

Claims (7)

1. A method of manufacturing a printed product, comprising applying a metal layer to a portion of a surface of a paper medium corresponding to an image fragment, and subsequent printing of said image, including continuously sealing with a colored ink a metal layer in said portion, characterized in that the surface of the paper medium is impregnated with an antistatic pre-coating layer metal, which is processed by corona discharge before printing. 2. The method according to claim 1, characterized in that the antistatic agent is used in the form of an aqueous solution, which is applied to the surface of the paper carrier by screen printing. 3. The method according to claim 1, characterized in that the printing is carried out by offset printing. 4. The method according to claim 1, characterized in that as a paper carrier use a sheet of paper or cardboard. 5. A printed product containing a paper carrier with at least one surface portion successively coated with a metal layer and a paint layer, characterized in that a paper or cardboard with a surface impregnated with an antistatic agent and a layer applied to it are used as paper carrier metal, previously applying a layer of paint, processed by corona discharge. 6. The product according to claim 5, characterized in that the paint layer is made of at least one color ink applied by offset printing. 7. The product according to claim 5, characterized in that the antistatic agent is an aqueous solution of an antistatic agent applied to the surface of a paper carrier by screen printing.

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