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Environmental Protection Shenzhen Printing Factory - How Gravure Realizes Green Environmental Protection
- Apr 20, 2018 -

How Gravure achieves green environmental protection:

The new technology, new processes, new equipment and new materials in the gravure printing industry will develop rapidly in the direction of green environmental protection, energy conservation and emission reduction, loss reduction, and improvement of quality and efficiency. In this context, the Shenzhen Printing Company has started to apply a series of new technologies such as benzene-free technology, loss control, efficient drying devices and solvent recovery to the gravure packaging gravure printing industry.


1. Gravure and other equipment upgrades and upgrades

The largest material loss in gravure production is the waste generated from commissioning and overprinting. If fine adjustment operations are closely linked to process steps, a stable, predictable scrap value can be obtained. Domestic gravure printing equipment manufacturers adopt the latest technology such as rapid pre-registering and high-precision tension control, which results in cutting loss, equipment restart loss (already registered), replacement loss, resumption of previously stored order loss, and speed reduction The loss reached a fairly low level, and even surpassed the international advanced level in some aspects.

 

Due to the pressure from the low profit of flexible packaging products, domestic gravure packaging gravure printing companies have been paying more and more attention to the material consumption index in the process of printing or compound equipment (including normal roll change) when selecting equipment, in order to minimize the cost of the product. Therefore, the material loss data has become an important consideration in the selection of equipment for gravure packaging gravure printing companies.

 

Today, the advanced gravure press operation assistance time is greatly shortened. The upper version and the ink-integrated trolley realize the integrated operation of the upper version, the version and the ink, and the roller and the ink tank can be cleaned off-line; the solvent is directly supplied into the ink tray from the solvent chamber through the quick inking system, and the supply amount is directly It is controlled by the ink viscosity controller; the sleeve pressure roller technology does not require tooling replacement, labor intensity is reduced, and the replacement time is greatly shortened; the rapid replacement of the blade technology enables rapid replacement of the blade; the laser edge-to-edge system, safety chuck quick clamping system achieves rapid Scrolling up and down; fault display and alarms help service personnel quickly diagnose and repair; historical fault alarm indications can reduce maintenance personnel troubleshooting time.

 

In the gravure printing process, the energy consumed by the drying box accounts for a large proportion. The application of the heat pump technology, the waste heat recovery system, and the layered oven effectively reduce the consumption of heat energy. The LEL-based automatic monitoring drying system saves energy and reduces emissions while also preventing the risk of explosion and combustion in the drying system, while significantly reducing the cost of tail gas treatment.


2. Exhaust emission control

Gravure VOC emission control measures mainly have three ways, namely source governance, process management, and end governance.

 

Source control reduces the use of organic solvents from the beginning of the printing process to achieve VOC emission reduction goals. The main measures are to promote low-VOC or VOC-free environmental inks, cleaning agents and other raw and auxiliary materials, such as the promotion of water-based ink, a single solvent ink.

 

Process management means that measures such as drying efficiency and production site management are improved during the printing process to achieve the purpose of VOC emission reduction. The main measure is to technically innovate the printing presses, reduce the volume of VOCs emitted from the production, increase the concentration, and increase the use of heat energy, such as adding LEL devices to the equipment, reducing solvent evaporation on the shop floor, capping the ink tanks, and promoting clean production. , conduct green printing certification, etc.

There are currently two main directions for end treatment, namely recovery and combustion. The recovered volatile organic compounds can be returned to the process and reused directly or after simple purification to reduce the consumption of raw materials, or to be used in a production process with a low requirement for the quality of an organic solvent or a centralized separation and purification. At present, some large-scale gravure packaging gravure printing companies have already begun to recycle exhaust gas (solvent). Whether it is adopting adsorption recovery method or regenerative catalytic combustion method, it is believed that gravure packaging gravure printing companies can obtain certain economic benefits and social benefits from it. benefit.


3. The benzeneless printing ink and the application of integrated ink

With the concept of environmental protection and sustainable development becoming more and more popular in the printing industry in Shenzhen, the relevant national environmental protection policies have changed from the “with law to compliance” phase to the strict phase of law enforcement. Terminal companies are increasingly demanding environmental protection, so the flexible packaging is concave. The benzene-free process in the Indian industry will inevitably accelerate.

 

A major technological advancement in the gravure printing industry from benzene-containing inks to benzene-free inks and flexible packaging is another innovation in the environmental protection technology of the ink industry. The backbone enterprises and some small and medium-sized enterprises in the industry have begun to use benzene-free inks. However, as far as small businesses are concerned, they are still mainly based on benzene (toluene and xylene) inks.

 

At present, the integrated ink has been used in a large area of large-scale flexible packaging gravure printing companies, which will become an important development direction of gravure ink.


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