As low carbon environmental protection concept deeply rooted in the hearts of the people, and consumer health consciousness constantly strengthen, flexible packaging gravure by not blame environmental protection enterprise is facing huge pressure, in the face of rising cost pressures and environmental protection, take effective measures to realize the greening of production process is imminent.To speed up the production of flexible packaging gravure greening process, in addition to using environmental protection material and process, should also pay attention to the material loss in the production process of the production cost and lower savings, and control of the VOC emissions and residues, etc.
A, improve the utilization rate of ink
Consumption in the production of flexible packaging gravure ink is bigger, improve the utilization rate of ink can save a lot of the cost of production for the enterprise.
1. Accurate confecting ink
Improper ink preparation, often can cause a lot of waste of ink, therefore, on the one hand, operators need to improve color skill and proficiency, on the other hand you need to update equipment, equipped with semi-automatic color machine, to ensure that the proportion of ink and ink accurate control of total amount, reduce the ink mixed waste caused by human factors.
2. Correctly handle with ink
Every gravure product has a mass-tone to move, and color ink consumption tend to be larger, printed after the completion of the remaining amount is bigger also, so is very important to improve the utilization rate of residual ink.To this, the printing of new products, you can use the remaining ink mixing consumption large ink, just add some new ink to slightly calibration hue can achieve it new with old ink.Rational utilization of residual ink can not only help enterprises to save costs, residual ink can also avoid the overdue scrapping the adverse effects on the environment, so as to improve the competitiveness of the enterprises.
Second, the waste film recycling
In the production of flexible packaging gravure tend to produce large amounts of waste film, the resulting waste of resources.Therefore, recycles waste film also an important embodiment of flexible packaging gravure green.
1. Using waste film test color
We can use the primary overprint of film or other printing defects and scrap film to complete the test after color process, the opposite of opposite after color is complete, simply use solvents to wipe off film positive print pattern, can be observed in negative effect.
2. Complete the primary overprint with waste film
According to the requirements of the different products printing width rational utilization of waste film, for example, gravure primary overprint is depend on the mark line to complete, and mark the line width is generally 10 ~ 15 mm, so can use waste film margin to complete its primary overprint.
Three, reducing VOC emissions
Currently, most domestic gravure ink set of equipment and the ink barrels are open, inks and organic solvent are directly exposed to the air, make organic solvent to evaporate into the air, and the improvement of environmental temperature and speed of production will also speed up the volatilization of organic solvent.
We have learned, at present, some advanced imported gravure equipment has enclosed the ink tank and ink circulation system, Longyin Group suggested that domestic intaglio printing equipment manufacturers and flexible packaging enterprises should draw lessons from the advanced ideas, on the basis of the existing equipment improved slightly, to a greater extent to reduce volatile organic solvents.
In addition, the use of organic solvent recovery equipment in the process of gravure recycling of organic solvents, also is a kind of effective measures to reduce organic solvent emissions.At present, the domestic some large flexible packaging enterprises have been introduced and applied to the organic solvent recovery equipment, and achieved good economic and social benefits.
Four, to reduce the residual organic solvents
Previously, flexible packaging gravure ink used in printing is mostly benzene soluble ink, benzene solvent has great toxicity, not only pollute the environment, also easy to remain on the packaging, endangering human health.Thus, to realize green gravure, the selected ink should comply with the HJ/T371-2007 "environment mark product technical requirements gravure ink and flexo printing ink such as technical requirements of the standards.At present, the market share of no benzene ink are increasing, no benzene printing has become the mainstream.
In addition, water-based gravure printing ink with outstanding environmental protection advantage, also received extensive attention of the industry, at present, water-based gravure printing ink has been applied to paper gravure enterprises get better, but because of its performance on flexible packaging film gravure's weaknesses and make its application is still very limited, the good news is that domestic in the aspect of development and application of water-based gravure ink has taken a solid step.
Thus, to reduce the solvent residues in intaglio printing production, using benzene ink, water-based gravure printing ink and other environmental protection gravure ink will be the future trend of intaglio printing production.
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