Packaging Printing is Changing to Green Production Process

China is a large country with a large population in the world, and of course it has also become a big country for packaging and printing. However, since the financial crisis in 2008, printing companies in many parts of China have continued to show a decreasing trend. In particular, the total number of small and medium-sized printing companies in the “Yangtze River Delta” and “Pearl River Delta” economic zone cities have closed down almost every year. . The reason, in addition to the market downturn leading to a serious imbalance in the supply and demand of printing business, there is an important reason, that is because the core competitiveness of printing companies, more and more can not meet the requirements of market development. Among them, there are no lack of production methods, production process lagging factors, but also the reasons for poor material performance, resulting in low production efficiency and product quality, production material consumption, energy consumption, high production costs, the existence of this phenomenon, contrary to the country Promote low-carbon economy, green production, environmental protection policies and goals. Therefore, the current printing industry can only enhance its ability to control the market by following the rules of market development and changing to the green printing production mode.

1. Correct understanding and understanding of packaging and printing green production process

Green represents vitality and vitality. Green symbolizes strong vitality. Green is the most common color in nature. Green is also a symbol of hope. Perhaps because of this, green has also become the representative color of the International Association of Environmental Protection Associations. I think that green is synonymous with environmental protection, health, hygiene, pollution-free, energy-saving, and provincial timber. Then, according to the author's understanding and understanding, the green production of packaging and printing technology should be the use of new technologies, new equipment, new materials, new processes, new methods, and new management methods and means to achieve both better use and conservation of raw materials. , to reduce the production of materials and energy consumption, and promote the synchronization of production efficiency and product quality, but also help protect the ecological environment and reduce environmental pollution, and better protect the health of the human body. In this sense, the green production process of packaging and printing is a systematic project that involves a wide range of technologies, including not only the technological innovation, transformation, and rational design of equipment, workshops, and related supporting facilities, but also paper, ink, and coating. Oil, car wash water, blanket, roller, fountain solution, additives and other printing consumables performance and adaptability to improve and expand. In addition, the application of scientific methods and management methods, the traditional methods of operation and production methods for technological innovation and transformation, to reduce production costs, improve production efficiency and product quality, which is also an important way to achieve green printing process. Therefore, when packaging and printing companies change their direction to the green production process, the most important thing is to first change the concept of production and operation and production management, and change the traditional backward production methods and processes. For example, the need for warm-up during production and the need to stop car wash equipment , It is best to arrange for the form of continuous operation. There are also high-energy-consuming devices that can be used to avoid production during the peak period of electricity use, so that reasonable use of energy can be achieved and production costs can be reduced.

2. To achieve green production through scientific and rational design

The author found in years of work practice that scientific and rational design of the printing layout not only can reduce the fearless waste of production materials, but also can improve production efficiency and product quality. For example, some color printing products only need to output 2 or 3 printing plates according to spot color printing. If four color printing plates are used, 4 printing plates must be output, and the layout of flat screen structure should be printed out in several colors. The color is equivalent to the effect of several spot colors, and the layout of the double-color printing is most prone to quality defects such as delineation, spotting, and color aberration, and the rate of defective products is also high. Therefore, for a multicolor overprinted layout, if the effect of color rendering is the effect of spot colors, it is better to perform platemaking and printing according to spot colors, which can not only save the plate material, but also facilitate the control of the printing quality. For another example, if the printed material is thin and soft, the precision of the printing press is not high, and the customer designs the layout of the printed product into a precise overprint structure. In this regard, it is considered that the overprinted layout is designed as a trapping structure, that is, The light-colored layout outline is appropriately expanded or reduced in a slight amount, so that if overprinting is unacceptable, the edge of the dark-colored layout will be less prone to white defects, and the unqualified product rate will be better controlled. In addition, the use of flexographic printing products, should take into account the flexibility of flexographic plate material, the imprinting process is easy to appear deformation characteristics, from the technical point of view to improve the resolution of the printed layout, the printed layout should try to avoid the design of small lines, Text or patterns to avoid the occurrence of quality problems such as stencil, dirty version, etc., resulting in increased printing loss. When designing, the text and line layout can be designed to be larger, which can not only make a visual sense, but also improve the use effect of the product, and better ensure the printing quality of the product.

3. Should pay attention to choose the right raw materials

1 Select the right paper and suitable printing process. Paper is the main component of packaging printing production costs. Different types of paper and differences in quality levels are the main factors affecting production consumption and the quality of left and right products. According to the purpose of the product, the appropriate selection of paper types and quality conditions is an important measure to achieve the rational use of precious natural resources. Therefore, in accordance with the price and quality of the goods, as well as the characteristics of the goods and the basic requirements for packaging protection, choosing the right type of paper and quality grade for printing production is a crucial control link. The author believes that through the reasonable adjustment and control of process technology, improve the packaging quality of the base paper to avoid the waste of resources caused by overpackaging and luxury packaging. In addition, according to the characteristics of the original paper to select the appropriate process in order to better improve the product's printing quality. For example, if the paper or paperboard with poor surface gloss and poor luster properties is to be printed with a relatively large ink-absorbing surface, the quality effect will be unsatisfactory if the offset printing process is used. However, according to the number of prints and the structural characteristics of the layout, the number of pages should be used as appropriate. Flexographic, gravure or silk screen printing process, the quality of the results will be a good balance, and substandard products will be greatly reduced.

2 Select environmentally friendly ink for printing. Ink is one of the main materials that affect the printing quality and production consumption of products. Starting from the environmental protection and sustainable development of the production process, the ink should be non-toxic, odorless, free of lead, chromium, cadmium, mercury, arsenic, bismuth, Fluorescent and other harmful substances, as well as other harmful solvents, etc. Therefore, it is the social responsibilities that printing companies should have to print inks that are free of harmful substances or whose content is lower than the relevant standards. Especially for printing products involving food packaging, it is necessary to use environmentally-friendly inks for printing. Since the water-based ink thinner is water and ethanol, it is a non-toxic solvent, and the relative safety factor is relatively high, and packaging materials can be better avoided. The ink on the ink contaminates the food by means such as migration. Therefore, the gravure printing or flexo printing process should choose environmentally friendly water-based inks for printing. Embossing and offset printing can also be printed using UV inks. The drying speed is fast, and it can avoid the pollution problem caused by the use of anti-sticking powder. In addition, the offset printing process can also be printed with soybean environmental ink because it uses soybean oil instead of the mineral oil in the ink, and the soybean oil-based ink made in place of ordinary petroleum-based ink can better avoid contamination of the product.

4. Saving energy and reducing consumption through technological transformation of equipment

1 The replacement of one-sided corrugating roller saves energy and reduces consumption. Corrugated roller is an important part of the production of packaging products. The corrugation height of corrugated board and the waveform characteristics of corrugation and corrugation within 30cm length are important conditions for the strength of corrugated board. Corrugated board structural characteristics also determine the length of the unit corrugated paper rate. The competition in the carton industry requires the production of carton boxes whose quality meets the standards on the basis of the most economical use of materials. The author's past example of the effect of a corrugating roll transformation process is still fresh in its memory. There was a single-sided corrugated roller with severely damaged pick-up teeth, so when making a new corrugating roll, the corrugated roll was custom-made to be 48 teeth/30cm; the corrugated roll had a tooth height of 2.9mm, which was 4 more than the original number of teeth. One tooth, while the height of the caries reduced by 0.2-0.3mm, but still fall within the standard range. In this way, this single-faced corrugated unit is subjected to process test analysis under the same production process, environment, and paper quality conditions. The results show that the corrugated cardboard produced by the machine prior to the transformation was more than the corrugated layer, but its quality was It is not as good as a corrugated cardboard with a small amount of paper in the corrugated layer. That is, the original 2m long corrugated paper can only be formed into a 1.385m long corrugated board, and the 2m corrugated paper after the roll change can be used to form 1.405m long corrugated board. After several inspections and comparisons, the edge pressure strength, adhesive strength, and plane compressive strength value of the corrugated board produced after the machine transformation are all higher than those before the transformation. This not only achieves energy saving and production reduction, but also the quality of the product. Can meet the requirements.

2 Guide jaw type single-faced machine is transformed into vacuum adsorption structure. The guide plate of the old-fashioned single-faced machine, after being used to a certain degree, will have a large wear phenomenon, so that the corrugated paper cannot be accurately positioned on the lower corrugating roller for coating and molding. In addition, the glue roll tends to accumulate adhesive on both sides of the guide pawl plate, all of which will affect the uniform coating and corrugating molding quality, prone to poor adhesion quality, and large raw material consumption. The adoption of vacuum adsorption positioning and shaping of corrugated cardboard can better eliminate the positioning instability caused by the mechanical wear of the lead-claw structure, making it easier for the machine to achieve normal high-speed operation. The guide jaw type single-faced machine is transformed into a cover-type vacuum adsorption method, which can effectively guarantee the processing quality of corrugated cardboard and reduce the consumption of corrugated molding processing. The cover-type vacuum adsorption device also has a significant advantage. When the production paper web is small, continuous normal and stable high-speed operation can also be achieved.

3 The use of thermal oil furnace instead of steam boiler to achieve energy saving. Energy is a prominent factor affecting the production cost of the carton. The heat-conducting oil furnace can obtain higher working temperature under lower operating pressure. The heating temperature is generally between 250°C and 320°C, which can meet the requirements for carton production. Its main advantage is that thermal efficiency can be kept at an optimal level over a wide range of loads, enabling stable heating and precise temperatures. Owing to the small error in the outlet temperature of the thermal oil furnace and reliable operation control and safety monitoring devices, energy saving and consumption reduction can be achieved. Therefore, the use of heat-conducting oil furnaces to replace traditional steam boilers is also a direction of change for a packaging production company that can consider energy saving and consumption reduction.

4 Save energy and reduce consumption by adding steam and condensate recovery system. The carton production line can be equipped with a steam and condensate recovery system. The condensate and waste steam produced in the production line can be pressurized by the piston-cylinder compression principle, and then the water-steam mixture can be directly pressed into the boiler so that the steam point of the boiler can be used. The steam recovery machine forms a closed circulatory system to achieve maximum energy savings. This steam recovery compressor uses a new material that is resistant to high temperatures and wear, and is oil-free and wear-resistant. The steam recovery machine is directly recycled at a high temperature, with a thermal efficiency of about 60%, and steam traps can be eliminated. The steam recovery compressor is driven by the mechanical transmission system to drive the compression system to pressurize the high-temperature steam-water mixture to reach and exceed the pressure at the time of boiler operation and press it into the drum to realize recovery, saving soft water and saving electricity and coal energy. .

5. Reasonable use of large format printing to reduce production costs

In fact, according to the characteristics of packaging and printing products, the advantages of using large-format printing machines are also options for achieving green printing. However, some printing factories have a one-sided view that large-format printing presses are used to print long-line printing products without considering the structure of the products. The result is counterproductive. It not only fails to increase production efficiency and product quality, but also greatly increases production costs. Therefore, large-format printers are best suited for printing carton products and other large-format printing products. If we do not consider the characteristics and structure of the product, we will only need to die-cut small-size paper boxes, paper bags or other small-size trademarks that need to be cut and punched, and the precision of layout overprinting should only be considered in large numbers. High-quality, relatively thin materials are also printed in large-format printing. This blind printing process not only affects the production efficiency and quality of the subsequent die-cutting, cutting, or punching, but also causes The increase in the consumption of raw paper may even cause part of the layout of the product to be scrapped because the quality does not meet the standard requirements. Therefore, the author believes that large-format printers are suitable for printing production in large quantities, but also have the characteristics of large finished products, no layout overprinting, and thicker paper or cardboard printing products in order to maximize the use of equipment. The effectiveness of the printing production reduces the cost.

In summary, the transformation of packaging and printing products into green production processes is a general trend. We must have forward-looking awareness, from the strategic point of view of social development and progress on the impact and pressure on business, constantly changing ideological concepts and management concepts, focusing on continuous innovation from the aspects of production methods, production processes and production management in order to fundamental In order to increase production efficiency and product quality, and achieve the purpose of reducing production costs, this is the goal that every printing company most eagerly expects.