CN112172315A

CN112172315A - Embedded micro-character pattern gravure printing design manufacturing method

Info

Publication number: CN112172315A
Application number: CN202011075945.1A
Authority: CN
Inventors: 彭亮
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-10
Filing date: 2020-10-10
Publication date: 2021-01-05

Abstract

The method for making embedded micro-word pattern intaglio printing design is characterized by that before the intaglio printing plate-making process, the correspondent position of design file is pretreated, and under the condition of correspondent accuracy requirement it adopts engraving plate-making process, and can directly make engraving plate-making process, and adopts corrosion plate-making process to make further fine engraving after the correspondent position is treated, and then makes the plating layer for raising printing resistance. The invention improves gravure printing, and improves the anti-counterfeiting performance of gravure printing to a greater extent.

Description

Embedded micro-character pattern gravure printing design manufacturing method

Technical Field

The invention relates to the field of gravure printing anti-counterfeiting, in particular to a method for embedding micro character patterns into line ink blocks of gravure printing so as to form more complicated gravure printing effect and a method for manufacturing a gravure printing plate thereof.

Background

With the more and more exquisite and high-grade paper box packaging, the packaging enterprises have more and more requirements on the combination of multiple processes. The demand for sheet-fed gravure printing is also expanding and has gained wide acceptance, particularly in the field of cigarette packets. Meanwhile, intaglio printing is used as a durable anti-counterfeiting printing technology, the printed matter has the characteristics of rich layers, bright and durable color, clear lines, strong sense of relief, perception by hand touch and the like, the printing plate resists printing for more than million times, and plays an important role in the fields of currency bills and the like for a long time.

The micro text printing is one kind of anti-fake technology widely used in paper money, bank check and other valuable printed matter and certificate. In the inconspicuous areas of paper currency or other printed matter, microprinting is often used, where characters are printed with very small font sizes, so that they are difficult to read by the eyes, and when a counterfeiter attempts to copy them using a copier or computer scanner, the microprints appear as dotted or solid lines on the copy.

Although intaglio printing patterns and micro-text patterns are used simultaneously on various paper money, bank checks and other valuable printed matters and certificates, the intaglio printing patterns and the micro-text patterns exist independently as anti-counterfeiting elements, the intaglio micro-text can only be used as the intaglio printing application of micro-printing technology, the micro-text embedded on the intaglio pattern of characters such as dollars is also embedded in the pattern as lines consisting of fonts, and compared with the intaglio micro-text on the back of RMB, the technology improvement on printing is not large. A printing technique for embedding micro-characters in or on an ink layer of gravure lines can remarkably improve the anti-counterfeiting level. For example, at the upper shoulder wide line of the figure image on the front face of the RMB, micro characters embedded in the middle of the line ink layer are designed, the gravure lines at the upper shoulder are wide enough and are approximately close to 1000 micrometers, characters embedded with 2 pounds and 500 micrometers are enough, the smallest resolution distance of objects under 25CM of human eyes reaches about 30 micrometers, and the requirement of public first-line anti-counterfeiting can be met by naked eyes. For example, the bright color light variable numbers on the RMB can be printed by gravure printing and silk screen printing, if gravure printing is adopted, the gravure effect of 100 micro characters is made on the upper surface of the UV ink layer, the bright color light variable numbers can also be distinguished from similar design printing of other currency, the imitation difficulty is improved, the thickness of the ink layer of the bright color light variable gravure printing is more than 80 micrometers, the bright color light variable gravure printing has a lens effect, and concave micro character patterns more than 30 micrometers are designed on the upper surface of the ink layer and can be clearly distinguished by naked eyes.

Disclosure of Invention

A method for designing and manufacturing embedded micro-text pattern intaglio printing, the effect after printing is expressed as the micro-text pattern effect with a recess or a bulge in the middle or on the upper part of the pattern ink layer of the intaglio printing,

in order to realize the purpose, the corresponding position of the design file needs to be preprocessed before the gravure plate making, in the engraving plate making process, the reverse engraving data operation of the sunken or raised micro characters on the corresponding part is directly carried out, and then the machine is used for directly engraving. In the etching plate making process, the processing method is different according to the designed concave or convex effect.

The manufacturing method of the gravure printing plate of the common commercial package mainly adopts a chemical etching method at present, and the basic process flow is as follows: the method comprises the steps of selecting and manufacturing plates with double-layer or multi-layer metal structures, configuring photoresist one by one, cleaning the surfaces of the plates one by one, coating, developing one by one, overhauling one by one, exposing one by one, corroding one by one, stripping one by one, overhauling one by one, and cutting one by one. Namely, when plate making, firstly preparing photoresist (photoresist), then coating the photoresist on a pre-synthesized double-layer or multi-layer metal plate by a centrifugal coating method, drying the photoresist, then using a reverse positive image film to print the plate by a high-power ultraviolet light source printing machine, wherein the photoresist of the visible light part is crosslinked and solidified in the printing process, the photoresist of the invisible light part still keeps the original character, pouring developing solution on the exposed plate surface, manually brushing the exposed plate surface by a hairbrush or a felt brush until the photoresist of the invisible light part completely falls off to expose the metal layer below the exposed plate surface, then manually inspecting and repairing the exposed plate surface, further crosslinking and solidifying the photoresist layer by secondary exposure to enhance the corrosion resistance, manually corroding the exposed metal layer by strong acid until the second metal is completely exposed, and then removing the photoresist layer, and finishing the manufacture of the printing plate through final maintenance, and improving the printing resistance through chromium plating.

The method of treatment of the undercut is detailed below: the micro text pattern lines in the lower concave part are cut into a small section on the design file, so that the photosensitive glue corresponding to the printing plate at the position is hardened to be used as a protective layer during printing. After the etching and demoulding, the fine text is carved out by an engraving machine, so that the required intaglio printing plate is obtained, namely the first layer of metal of the fine text pattern part has corresponding text patterns and is left on the printing plate.

The method of treating the projections is described in detail below: filling the micro text pattern lines at the convex part on the design file, wherein the corresponding convex micro text pattern cannot be seen on the file, normally making a plate, and after the working procedure is finished, machining and engraving the micro text pattern part at the corresponding part, namely, the corresponding part of the second metal layer is provided with the concave micro text pattern.

The processing method of the manual engraving plate can be characterized in that after the normal manual engraving plate is finished, an electroplating process is adopted to copy a manual engraving master plate, then corresponding parts of the master plate copy plate are filled, engraving is carried out on engraving equipment meeting the precision standard according to the requirement of design precision, and after the engraving is finished, the engraving plate is copied by the electroplating process. The precision of a general mechanical engraving precision cutter can reach 0.1 mm, the displacement precision is 0.01 mm, the diameter of a light spot of the general laser engraving precision is 0.01 mm, the displacement precision is 0.01 mm of the mechanical type, and the depth is determined by adopting energy control according to materials and is sufficient for general gravure plate making requirements.

Preferably, the lines of the microtext pattern are as thick as possible to prevent the effect of the ink leveling that the microtext portion is not noticeable.

Alternatively, for the treatment of the resin plate intaglio plate, the resin hardened layer refers to the first metal layer of the plate making method described above, and is only an intaglio printing plate having inferior press resistance to the composite metal layer.

Alternatively, the chrome plating process may or may not be performed as needed for the actual print volume as a means of improving the press durability.

According to the present invention, the following significant effects are exhibited: can provide a micro-text pattern effect with concave or convex in or on the pattern ink layer of intaglio printing, and improve the anti-counterfeiting performance of intaglio printing to a greater extent.

Claims

1. The method for making embedded micro-word pattern intaglio printing design is characterized by that before the intaglio printing plate-making process, the correspondent position of design file is pretreated, and under the condition of correspondent accuracy requirement the plate-making process can be directly engraved, and after the intaglio printing plate-making process of etching plate-making process is adopted, the correspondent position can be further finely engraved, and after the plate-making process is completed, a plating layer for raising printing resistance can be made.

2. The intaglio printing design and making process of embedded miniature text pattern features that on the solid block ink layer with certain width, the concave or convex text pattern effect of miniature text pattern is designed.

3. A gravure printing design and manufacturing method of embedded micro-text patterns is characterized in that the micro-text pattern effect with concave or convex is designed and manufactured in or on a wide line ink layer of a gravure solid bottom.