Nowadays, when people walk into the supermarket, they can see a particularly eye-catching label, which is characterized by its transparency, strong three-dimensional character and vivid colors. Because this transparent label has a good shelf display effect and consumers can directly understand the product characteristics, it is increasingly favored by end users. It is the screen printing that creates this striking effect.
What is commonly referred to as screen printing is the fact that flat screen printing is very slow due to the fact that its equipment is very slow for single sheet feeding. So what are the ways to improve production efficiency. Printing thicker ink layers and producing more fine prints can meet these requirements with 7 rounds of screen printing.
1. Features
Rotary screen printing has the advantage of high speed. Print fine. It can be produced online with flexographic gravure, offset and relief printing. Rotary screen printing machine designed for roll-to-roll printing. Printing materials include narrow webs to wide webs. Thickness up to 0.5mm.
2. Screen
At present, common rotary screen materials can be classified into two types: electroformed screens and woven screens. The RotaMesh screen version of the company Storkf (Netherlands Storkf) is an electroformed pure nickel mesh that belongs to a non-woven mesh with hexagonal mesh openings. Screen can be stripped. Repeated use of Gallus' Screeny Screen is a knit web. Nickel plated. Preprinted photosensitive screen two kinds of screens have their own special characteristics of electroforming the network does not have the weft of the latitude and longitude of the network, so the ink transfer performance is good. High printing accuracy. The printing speed is fast and it is more suitable for printing high quality mass production products.
3. Technology
Take Stork's screen printing process as an example. Stork Corporation's screen edition has 5 kinds of mesh number, 11 kinds of specifications (by opening rate), first select the appropriate screen version according to the customer's requirement, and then weld to the customer's required size through special process. Rotary screen printing specific production process is as follows.
Cutting a welding a mounting bottom ring a fat 5 times gluing (see Figure 1) a round of exposure (see Figure 2) a development-drying a revision of a print.
The printing technology of the two groups is increasingly popular because rotary screen printing can be combined with a variety of printing methods to complete high-quality printing and realize multiple printing effects. Therefore, the application field of rotary screen printing has become more and more extensive. In high-end packaging such as tobacco packaging printing. Printing and other fields. Not only can produce high quality prints. It can also play a certain anti-counterfeiting effect. P & G. Colgate, Johnson & Johnson and other daily chemical products company. And Qingdao. Jinwei Carlsberg and other famous beer companies are using transparent labels produced by the rotary screen printing combination process
At present, some domestic printing companies, such as Shanghai Zhengwei. Shanghai Guoma. Starlight of Suzhou. Guangzhou Meixi and Guangzhou Silk Ai and other companies. All can use the rotary screen printing group printing process to produce transparent labels. Rotary screen printing combination printing process mainly includes the following two kinds:
1. Flexographic printing / letterpress printing + rotary screen printing This combination of methods can better complete the transparent label printing cosmetics. The label materials are paper and film, now more popular is the transparent film. This material can be made into high-quality, beautiful labels by a combination printing process.
Generally before printing other colors. The first color group uses rotary screen printing unit to print white ink. Bottoming on the transparent film, the color of the bottomed label is more vivid. If the customer wants to get a thicker layer of ink. You can adjust the number of mesh screens and open hole rate. To change the thickness of the ink layer.
Printing companies can also perform cold stamping or glazing on in-line printed labels using a combination printing process. Some printing companies install several rotary screen printing units on a flexographic printing press. It can be printed from ink. You can print other colors. Some multinational companies have deliberately opted for the transparent label of screen printing in order to highlight their product brand advantage or strengthen their corporate image.
In addition to cosmetics companies, many well-known beer brands now use transparent labels such as Tsingtao, Kingway and Carlsberg. A transparent label used by Tsingtao Brewery is to use a rotary screen printing unit to print white ink first, and then use a letterpress or flexo printing unit to print other colors. The use of rotary screen printing labels Wen Yu has a clear three-dimensional, with white ink after the color is more vivid. Can attract consumers' eyeballs to the greatest extent.
The combined printing process of flexographic printing + rotary screen printing can also be used for printing high-grade cigarettes, alcoholic beverages or gift boxes. Rotary screen printing can be used to print a variety of special inks.
Now more use of matte ink (imitation metal etching). Ice flower ink. Wrinkle ink. Pearlescent inks and mirror inks, plus rotary screen printing have online production. Fast printing ink thick, colorful features. Deeply loved by printing companies.
The matte ink printing process is to print a layer of matte ink on gold and silver cardboard or laser paper. Get a similar smooth metal after corrosion. Unique visual effects after engraving or sanding.
Ice printing ink printing process is printed on gold and silver cardboard or laser paper ice ink, after curing by uV. The prints are crystal clear and dense, with a special snowflake effect under light.
The combined printing process of flexographic printing + rotary screen printing can improve overprint accuracy. The flexographic plate should be considered when considering the tensile deformation of the resin plate and the double-sided tape material. The flexographic plate usually needs to be considered when making a flexographic plate. Rotary screen printing screens are more flexible in making adjustments. For example, Sork's rotary screen production can be adjusted. According to the corresponding process requirements to produce film. Such as 96T screen version of the film length is 30456ram. With a thickness of 0.1mm, this adjusted film length fits well with flexographic printing.
2. Offset + Rotary Screen Printing
This combination of forms of printing equipment, such as the Delante-Gebel VSOP series printers, printing continuous image gradient levels, etc., can play the advantages of offset printing. Combines the advantages of thick printing ink printing screen printing process.
This combination printing process can print a variety of special inks, and is also the preferred choice for many high-end packaging such as tobacco and wine packaging. In addition, this combination printing process can also be used to print securities such as ticket lottery scratch cards. Use rotary screen printing process to print silver ink. The use of rotary screen printing ink thick. Play a certain anti-counterfeiting effect.
Source: printing technology Author: Chen Xuelong
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