The most popular gravure printing technology and i

2022-07-24
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Gravure printing technology and its application in anti-counterfeiting packaging

gravure printing is a direct printing method, which directly imprints the ink contained in the gravure pit on the substrate. The thickness of the printed picture is determined by the size and depth of the pit. If the pit is deep, it contains more ink, and the ink layer left on the substrate after imprinting is thicker; On the contrary, if the pit is shallow, the amount of ink contained will be less, and the ink layer left on the substrate after imprinting will be thinner. The printing plate of gravure printing is composed of pits corresponding to the original picture and text and the surface of the printing plate. During printing, the ink is filled into the pit, the ink on the surface of the printing plate is scraped off with an ink scraper, the printing plate contacts with the substrate under a certain pressure, and the ink in the pit is transferred to the substrate to complete printing

I. characteristics of gravure printing

the ink carrier during gravure printing is a pit carved on the printing plate. The shape of the pit is exactly the same as the original text, and there is no ink on the surface of the printing plate. When the printing plate is in contact with the substrate, the ink in the pit is transferred to the substrate surface to complete the printing process. Therefore, gravure printing has some unique characteristics different from other printing methods, which are discussed below

1. Anti counterfeiting features

gravure printing carries ink in pits carved according to the original graphics and texts. The thickness of lines and the thickness of ink can be controlled arbitrarily during engraving, which is not easy to be imitated and forged, especially the depth of ink pits. The possibility of realistic engraving according to the printed graphics and texts is very small. Therefore, the current paper money, stamps, stocks and other securities are generally printed in intaglio, which has a good anti-counterfeiting effect. At present, some enterprises have consciously adopted gravure printing for their trademarks and even packaging decoration, which shows that gravure printing is a more viable anti-counterfeiting printing method

2. Wide application range

general soft materials can be used as substrate for gravure printing. For example, plastic, paper, aluminum foil, etc., especially for some materials that are easy to extend and deform, such as textile materials, have good adaptability, which is unmatched by relief printing and lithographic printing

3. High printing quality

gravure printing uses a large amount of ink, with convex graphics and texts, rich layers, clear lines and high quality. The printing of books, pictorials, packaging and decoration mostly adopts gravure printing

4. Suitable for large-scale printing

gravure Guangya aluminum and the Guangya Aluminum Processing Research Institute established by Nanjing University have a long plate making cycle, high efficiency and high cost. But the printing plate is durable, so it is suitable for mass printing. The larger the batch, the higher the benefit. For printing with smaller batch, the benefit is lower. Therefore, gravure method is not suitable for printing trademarks in small batches

II. Types of gravure printing

the types of gravure printing are divided into two categories according to the plate making methods: engraving gravure and etching gravure

1. Engraving intaglio

engraving intaglio is to directly carve the pits corresponding to the original text on the surface of the printing plate cylinder with a cutter. According to the control method of the cutter, it can be divided into manual engraving intaglio, mechanical engraving intaglio and electronic engraving intaglio

(1) manual engraving intaglio

manual engraving intaglio is made by technicians using a cutter to manually engrave on the surface of the printing plate cylinder according to the original text. The printing plate material can be copper plate or steel plate. Manual labor is heavy, plate making costs are large, and the cycle is long. However, the intaglio lines carved by hand are clear, and the printed matter has a strong sense of hierarchy, which is difficult to forge. Most of them are used for making intaglio printing of securities and high-quality artworks

(2) mechanical engraving intaglio

mechanical engraving intaglio is made by engraving on the surface of the printing plate cylinder with a mechanical control cutter. It reduces the heavy labor of manual engraving, with fast plate making speed, short cycle and low plate making cost. It is mainly used for making intaglio printing of securities

due to the high cost of engraving and plate making and the long plate making cycle, the scope of use is limited. However, everything is divided into two. As far as anti-counterfeiting packaging is concerned, hand engraving intaglio may be the best way to make plates. Because secret anti-counterfeiting is a main method of anti-counterfeiting packaging, technicians can use various methods to carve some secret marks in the process of manual engraving intaglio. These secret marks on the manual engraving intaglio are not easy to be found, and it is more difficult to distinguish on the printed matter, which forms secret anti-counterfeiting

(3) electronic engraving intaglio plate

this type of plate is engraved on the surface of the printing plate cylinder by the engraver controlled by the electronic control device. Using the electronic carving machine, according to the photoelectric principle, the carving knife is controlled to carve holes on the surface of the cylinder, and its area and depth change at the same time

2. Etch gravure

etch gravure is made by etching ink pits on the surface of the plate cylinder by chemical etching according to the original text. According to the different methods of original text conversion, etched intaglio can be divided into etched intaglio, photographic intaglio and dot intaglio

etched intaglio is made by combining engraving and etching. That is to say, the shape of the original picture and text is carved by hand, and then the gravure plate is made by means of corrosion

gravure is widely used, which is the most widely used printing plate in gravure printing. It is mainly used for printing plates, etc

dot gravure is mainly used for packaging and decoration printing and building materials printing

III. The Application of gravure printing technology in anti-counterfeiting packaging

1. The anti-counterfeiting effect of manual engraving gravure printing is better

secret anti-counterfeiting is a major aspect of commodity anti-counterfeiting, which is implemented by trademarks. Manual engraving gravure printing provides a necessary means for it. Manual engraving gravure printing is easy to implement secret anti-counterfeiting during plate making. The depth of the pit during engraving determines the intensity level of the printed image and text. The imitator can easily copy the size of the image and text and the thickness of the lines, but it is difficult to copy the prints with the same intensity level (i.e. the ink pit with the same depth). This is the main reason why gravure has been used in Securities for a long time

the less the printing volume, the better the anti-counterfeiting effect. Due to the long cycle and high cost of hand engraving gravure, when the printing volume is small, the printing price is higher. The purpose of counterfeiters is mainly to pursue economic interests. When they are unprofitable or have little interests, they are unwilling to take any risks. Therefore, based on the technical feasibility, cost advantage and the possibility of range production, it can be said that the anti-counterfeiting effect of gravure printing for small batch trademarks may be better than that of large batch gravure printing

2. Plate making and printing are carried out in two places.

plate making and printing in different places have a good anti-counterfeiting effect. Printing plants generally have the ability to make plates, but the plate making work of trademark using enterprises should choose another unit, because a key to secret anti-counterfeiting is to know as few people as possible. Even if you know, you should only know a part of them, and you can't let them know the whole process of trademark design and printing. In this way, even if there is a loophole in one link, other links can meet the needs of anti-counterfeiting. When the trademark is printed in the printing house, the enterprise shall send strong minded personnel to the site to supervise the printing, so as to prevent the printing plate from being stolen and the trademark from being stolen. After printing, the printing plate shall be recovered and stored to absorb toxic gases such as carbon oxide

3. Combination with anti-counterfeiting ink technology

ink anti-counterfeiting technology is also an aspect of secret anti-counterfeiting. Combining gravure printing technology with ink anti-counterfeiting technology to achieve double secret anti-counterfeiting, the anti-counterfeiting effect will be better

some printing anti-counterfeiting inks have large pigment particles and require a thicker ink layer, while gravure printing has a thicker ink layer and a stronger texture. The combination of the two will achieve dual anti-counterfeiting and decoration effects

if fluorescent ink is used in gravure printing, it not only ensures the slight convex feeling of gravure printing, but also ensures the use requirements of fluorescent ink. The secret of both anti-counterfeiting is more valuable to customers, and the functions are also guaranteed

the ink shall be prepared by itself and then handed over to the printing enterprise for use. After printing, the ink shall be taken back and stored, so as to obtain better anti-counterfeiting effect

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