The failure and countermeasure of packaging and printing graphic and textualization

For a long time, people have studied the effects of packaging, printing and decorating, and found that the science and technology of printing and printing inks have both a certain definition and an unordered relationship. In the past two years, the author has invited Qingdao, Xiamen, Quanzhou, Hangzhou, Yangzhou, Shenyang, Shaoyang, and other places to invite the individual packaging and printing and ink manufacturers to conduct research. After tracing the technical services, the ink-film printing of the printed images and texts The issue is outlined in more detail, in which the insiders learn and exchange ideas.

One, the main reason

1. Insufficient film-forming agent of the ink 2. Excessive pigments in the ink system, especially the system pigment, are too coarse, so that the fluid has dilation;
3, ink powder body too much ink thick, ink film soft but not strong;
4, the pH value of the ink system is too high;
5, ink foam is too large (especially high-speed rotary printing ink friction caused by the high temperature caused by the formation of foam on the surface of the ink);
6, the paper quality is poor (rough, loose), the degree of surface dust / plastic film moisture absorption and reduce the adhesion;
7, the ink inhaled water, including plastic film inhalation of water;
8. The printing carrier water is too large / plastic film is not treated or treated badly or the greasy content of the plastic surface is high / the additives of the plastic system migrate to the surface;
9. Excessive amount of co-solvent in the ink system, especially non-volatile, too much non-mixed solvent or astringent surface after the ink is dry;
10. Improper drying facilities in the second half of printing;
11, the ink is too thin or bad adhesion, ink flocculation or salting out, the binder has lost the bond;
12. The ink is mixed with impurities and moisture and is decomposed by lithography or rancidity.
13, ink dispersion (including printing ink transfer roller) poor type of bad rinse;
14, Inaccurate printing pressure or poor roller function or insufficient padding;
15, ink dry too slowly, the quality of the link material too much and infiltrated a large number of printing substrate (such as paper suction is too fast) too deep; especially when the friction, folding, packing or consumption process is more obvious;
16, ink and printing ink liquid acid;
17, printing speed is not suitable (too fast);
18, printing pressure size;
19. Paper, plastic hair and dust are attached between the printing plate carrier and the blanket or the printing plate, and the amount of the releasing agent added in the ink is excessive.

Second, measures and methods

1. Control ambient temperature and humidity (18-25°C and 60-75%);
2, increase the hair dryer, drying, prevent the ink film dry and crisp;
3, choose high density, tightness of the paper and the processing of the formation of plastic hair surface (such as sizing large amount of paper / absorbent slightly weaker) and select the water, ink separation and flat plate;
4, control the paper moisture (4-14%);
5, control the printing of the PH value;
6, adjust the printing pressure and substrate tension (especially the elasticity of the printing plate);
7, increase the exposure time and control the exposure;
8, replace the printing ink or add some thick, sticky link material in the ink or increase the printing pressure or change the paper with high quality paper or PH value;
9, using infrared iodine tungsten doubles corona treatment and correct corona surface or re-surface treatment;
10. Add wax or calcium or paper to the plastic film;
11. Add coupling agent or anti-osmotic agent to the ink and add tackifier or choose suitable filming assistant;
12, choose a sticky or appropriate fineness of the ink or filter ink;
13, control the PH value of the ink (7-9.3) and select the hard ink;
14, control the ink dry speed (such as rotating water gravure ink surface within 1-3 seconds drying). Or change to faster dry ink or reduce the amount of ink;
15, the design of the deployment of volatile or oxidation gradient equilibrium solvent or adjusting oil or try to deploy high viscosity ink;
16. Improve the structure and consistency of ink binders (such as non-reactive resins and linseed oil, cooked oil, or medium viscosity varnish);
17, the use of rapidly drying packaging printing ink, add a small amount of varnish or light oil in the ink (such as trying to modify the ink dry, mixed with good ink and pigment on the paper, the proportion of small, oil absorption Large amount of pigments) using weak alkaline wetting fluid;
18, do not adjust the ink too thin, add some wax-type slip agent, use good adhesion fastness ink (select same-same ink) or cover layer of resin oil or a layer of plastic film;
19. The proportion of resin pigment in the ink should be appropriate (or select a resin with a large molecular weight, a pigment with a large and small proportion, or a filler added with a plasticizer; minimize dusting (for example, add corn starch or talcum powder to the ink, use only 325- 400 mesh filter before use);
20. Use a good elastic blanket and an elastic and smooth flat rubber or plastic foam on the printing plate support. Minimize release agent.

Although the failures and causes of powder film falling from the packaging and printing products are various, it is a quality problem (ink quality, printing materials, and operation skills) to be discussed at a large scale. The ink, varnish, wetting fluid, and dilution cannot be ignored. (Liquid) agent is the research focus of ink manufacturers; the substrate's PH value and density, smoothness of the packaging and printing material tension is also the material manufacturer's research objectives; printing plate leveling and oil absorption and printing pressure, ink adjustment Talking about the viscosity and the mechanical speed, it is more necessary to summarize and communicate the skills of the employees.