Application of laser engraving plate making technology in soft package industry

From the working principle and market application, the existing laser engraving platemaking technology mainly has the following types.

(1) Laser Ceramic Engraving Technology

A ceramic layer is evenly sprayed on the substrate, and then burned directly with a laser to form a net. This type of engraving technology can only be full-page engraving, and can not be part of the engraving text patterns, and the price of the version of the roller is very expensive, marketing has a very limited, mainly applied to the full version of the engraving anilox roller.

(2) Laser Rubber Carving Technology

A layer of rubber is evenly applied to the plate base and burned directly with a laser to form dots. The plates made by this technique are mostly relief plates, and are mainly used for corrugated box printing.

(3) Direct laser engraving of aluminum-zinc alloy plate technology

Laser engraving directly on the aluminum-zinc alloy plate base, but this laser engraving technology is not mature, the application of plate base material is not widely used, the plate cylinder can not be refurbished, there are certain limitations, hindering its promotion.
(4) Laser Etching Technology

This is a kind of laser engraving technology widely used in the current plate making industry. Its mature technology, rich product types, a wide range of base material, version of the drum can be repeated refurbishment, there is a good marketing prospects.
The following mainly introduces laser etching technology and its application in the field of flexible packaging.

Laser etching technology

1. Introduction

In the laser etching technology, firstly, the surface of the plate base (copper plating roller) is thoroughly degreasing and then uniformly coated with a layer of black rubber. The thickness of the adhesive layer may be determined according to different process requirements. Next, the imposition work station converts the documents produced by the prepress process into engraving data, and the laser directly burns the adhesive layer on the surface of the printing plate to form dots. After the engraving is completed, the etching is performed using an etching solution. The dots on the black adhesive layer are etched to form a network hole. The non-dot portions are protected from corrosion due to the adhesive layer.

2. The difference from ordinary electronic engraving process

The common electronic engraving process is the imposition workstation to control the surface of the rotary cylinder which is impacted by the high-speed oscillation of the electronic engraving head with a diamond engraving needle to form a net hole (the impact once forms a net hole). Laser engraving burns the surface of the plate base with a very small laser beam to form a net cavity (burning forms a cell multiple times). Different carving principles determine the essential difference between the two in the engraving parameters.
(1) The range of engraving cable is different. The range of electronically sculpted cables is between 35 and 120 lines/cm. The range of laser-engraved cables is wider and can be expanded to 5 to 250 lines/cm.

(2) The range of the cable angle (that is, the angle between the orientation of the dot arrangement and the horizontal direction) is different. The range of electronic engraving angle is 30-60°. The range of laser engraving angle is wider. It can be any angle between 0 and 360°, which can better prevent the moire phenomenon caused by the misalignment of the screen angle.

(3) The depth of the cell depth is different. The deepest depth of the electronic engraving network is 0.06 ~ 0.07mm; the depth of the laser engraving network can reach 0.25mm or more.

(4) The dot shape is different. The shape of the dots produced by the electronic engraving version is relatively single, and the dot shapes of the laser engraving can be edited by any of the shape dots, except for the random square dots, circular dots, oval dots, hexagon dots, and line dots. According to different manuscripts, different dot shapes are selected in a targeted manner so as to formulate an appropriate engraving process.

(5) The network volume is different. The electronically-engraved cell site is V-shaped, and the laser-engraved cell site is U-shaped, so its volume, ink storage, and ink loading are all greater, and the transfer effect is also better.

(6) Different word processing methods. Laser engraving can perform edge processing on text, and electronic engraving cannot do this.

Application in the field of flexible packaging

At present, there are nearly 40 laser engraving machines adopting laser-engraved film etching technology in the country, and the laser-engraved film etching technology has been widely applied in the field of flexible packaging. Below, the products of Shanghai Ocean City Printing Plate Co., Ltd. are taken as examples to make a simple process. Introduction.

1. Anti-counterfeiting applications

The requirements of printing and anti-counterfeiting in the flexible packaging industry are very prominent. Shanghai Shipping City Plate Making Co., Ltd. uses laser-engraved film etching technology, combined with special pattern-printing anti-counterfeit software, to develop a large number of security ultra-line version of the anti-counterfeiting products, such as Omitiao, Diaodao, Longliqi. As well as the anti-counterfeiting series of washing products represented by Sunsil, the seed bag packaging and pesticide packaging anti-counterfeiting series represented by DeNong Seed Industry, and the brand-name wine packaging anti-fake series represented by Wuliangye, Jinliufu and Yingjia, etc., in combating counterfeiting and inferiority. Both have achieved good results with small investments. Taking the seed bag anti-counterfeiting packaging of DeNong Seed Co., Ltd. as an example, as shown in FIG. 1, this pattern is composed of various anti-counterfeiting technologies, and the layers are stacked without losing the beautiful, with the dual effects of anti-counterfeiting and decoration.

2. Aluminum foil package

When printing letters on an aluminum foil pack, there are extremely stringent requirements for the ink color, edge definition, and cell repeatability of the text. The use of laser engraving corrosion technology to carry out special treatment of the text, can achieve the effect of the electronic engraving is no comparable, such as amoxicillin, Yunnanbaiyao and other aluminum foil package products.

3. Microscopic gold wire products

Using special anti-counterfeit software and laser-etched film etching technology can produce a variety of stickers for the brand-name packaging of micro-texture and micro-drawn patterns, has a very good anti-counterfeiting and decorative effect. Tobacco bag pull products include Xuchang Cigarette Factory Gold Cable Series, Wuhan Cigarette Factory Gold Cable Series, Guangxi Zhongyan Industrial Company Gold Cable Series, Honghe, Hongta, Baisha, Dahongyingjin Cable, Shanghai Tobacco Gold Cable and so on.

4. Coloring, gluing, waxing

Laser engraved film etching process has strong expandability. It can produce all kinds of network lines, various depths, and various types of mesh cavity full-size coating rollers and anilox rollers to meet various special printing applications such as wax coating, coating and glazing. Need for coloring.

Source: "Printing Technology" 2005.2

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