Overview of the most popular in mold label printin

2022-10-15
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Overview of in mold label printing process

currently, plastic film substrate is widely used for in mold label, which is printed in traditional way. The surface is coated with a layer of UV or EB curing varnish for protection, and the back of the label is coated with solid chemical adhesive. In mold label materials are suitable for a variety of printing processing methods and different inks, including silk printing, UV relief printing, flexographic printing, gravure printing and offset lithography. Before selecting the ink, the adhesion, scratch resistance, chemical resistance and other properties of the ink on the label material in the mold should be tested according to the requirements of the final application

there are two printing methods for in mold labels: web printing and sheet fed printing

1. web printing processing: it is divided into online one-time processing and extension multiple processing. These two processing methods are related to the factory's own equipment and label design requirements. If the electronic universal testing machine industry has always disagreed with this view, printing and processing labels with bronzing patterns, and there are circular pressing, circular bronzing and die-cutting devices on the printing machine, the processed labels can be formed at one time; If there is only a separate stamping machine and die-cutting machine, the label can only be processed many times. It is characterized by fast production speed and high efficiency, but due to the high cost of roll making, it is more suitable for mass production

2. sheet fed printing processing: usually silk screen printing and flat offset printing. In this way, multiple processes are completed on multiple equipment. The printing process is related to process design. The processing is more flexible, and the plate making cost is lower than that of the drum method, which is suitable for small batch production; The printing effect is good. The effect of silk screen printing and offset printing is better than that of web printing

offset printing process

1. offset printing characteristics

a. the printing quality of small dots is superior to other printing methods,

b. the printing effect and color saturation of strip and field are inferior to other printing methods,

c. the control of color difference is more difficult than other printing methods,

d. for short edition business, the production cost of offset printing is lower than other printing methods,

e. it has the advantages of flexible production and rich printing levels, It is suitable for in mold labels with small batch, multiple varieties and high printing quality requirements, and is more suitable for the current situation of label printing market in China

2. Offset printing process

a. the amount of powder sprayed is moderate, and the accumulation of prints should not be too high.

b. after printing, it should be fully aged to dry the ink, and after printing, it needs to be coated with varnish to ensure the quality of prints.

c. in printing, due to the poor hygroscopicity of the substrate, the amount of fountain solution should be reduced by 10% - 15% compared with the printing paper products (whichever is not dry). Too much fountain solution will lead to false drying and ink emulsification in printing. The pH value of fountain solution is controlled between 6 and 6.5

3. Offset printing equipment: most domestic printing enterprises use Heidelberg sheet fed offset press series, speedpa CD74 - Characteristics of medium format sheet fed offset press:

* a wide range of substrates, from thin paper to hard cardboard to plastic film,

* suitable for high-speed long version loose parts, fully automatic entry preparation and easy to control paper feeding system,

* Digital CP2000 printing control system supports the rapid replacement of paper format and stack

flexo printing process

flexo printing is the mainstream packaging and label printing method in Europe and America, but due to the imperfection of domestic flexo plate making and knife mold and other related supporting facilities, the current market share is small. However, flexographic printing has developed rapidly in recent years and is an important development direction of label printing

1. characteristics of flexographic printing

a. with the CDI plate making technology of computer direct plate making, it can obtain a better dot quality extrusion technology company, and especially shows the concept of extrusion drive and saturated printing color that can freely choose the electromechanical situation.

b. it has the advantages of one-time molding and multi process combination that cannot be compared with other printing methods.

c. the application of UV ink printing makes the printing color more beautiful, dry faster High one-time molding efficiency, suitable for medium and large batch production,

d. poor ink adhesion, poor gradient effect, generally Polish after UV printing

2. Flexographic printing equipment

foreign models are mainly Gerais and mcandi; Domestic models are mainly Shanghai Ziguang

(1) gullasem280 narrow flexographic press is an ideal model for the production of high-quality, low-cost and medium and long version labels. Its main features:

a. it is easy to operate, easy to clean, short preparation time for job adjustment,

b. it can quickly change the platform and take the S-type sensor as an example to quickly change the ink. It can convert the printing mode within a few minutes, and the printing process combination is flexible,

c. it can add the unit at any time, It is an ideal model for flexo printing and UV printing

(2) Shanghai Ziguang

yr420/450 series is a flexible printing machine, which uses water-based ink and is suitable for the packaging and printing of food and drugs. Among them, the main features of yr420 web flexographic press:

A. It has the functions of quantitative paper feeding, UV glazing, waste rewinding, longitudinal slitting, etc.

B. It is equipped with PLC controller, coil deviation correction device, static electricity elimination device, UV curing device, etc.

C. It can increase UV printing, self-adhesive printing, flip printing, bronzing, punching and other functions,

for example, in the test of physical properties

d. it is suitable for printing self-adhesive, coated paper, paperboard Aluminum foil paper, plastic film and other printing materials are ideal equipment for printing medium and high-grade packaging boxes, bottle stickers and labels

gravure process

gravure process has an absolute advantage in the number of gravure products in North America

1. The characteristics of gravure printing

a. in the field, the printing effect and color saturation are better than offset printing, the ink is thicker, and the color transition of the printed matter is natural, but the text expressiveness is not as good as offset printing,

b. in the control of color difference, it is better than offset printing and embossing,

c. the paper path is the longest, which is easier to generate static electricity than other printing methods,

d. the plate making time is long and the cost is high, which is not suitable for the medium and short version label printing business,

e. the ink layer is thick and has the best scratch resistance, and the printing speed is fast, which is especially suitable for printing large quantities of long version live parts,

F. continuous printing on the web, with high output and low cost,

2. Gravure printing equipment

domestic manufacturers such as Shaanxi beiren and Zhongshan Songde

Shaanxi beiren gravure printing machine is suitable for printing plastic film, tipping paper and other packaging materials

resin relief printing

1. the characteristics of resin relief printing

a. the quality of printing fine points is worse than that of other methods,

b. the printing resistance of printing plate is lower than that of gravure and flexo,

c. it is easier to control the printing color difference than offset printing, but not as good as gravure and flexo printing,

d. the cost and cycle of plate making are lower than that of gravure printing and flexo printing,

e. UV ink printing is applied to make the printing color more beautiful, dry faster, and high one-time molding efficiency, Suitable for medium and large batch production

2. Embossing equipment

foreign countries are mainly Ko pack and Luo tie. The class series center embossing cylinder printing machine manufactured by Japan Ko pack company is the representative model of CID high-speed label printing machine, which has the advantages of small substrate transmission error and accurate overprint; The printing speed can reach 100m/min; With small floor area and low site cost, it is very suitable for the Chinese market

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