In modern economic life, commodity packaging has become an important part of commodities. Because plastic packaging has the advantages of lighter weight, transparency, stable chemical properties, moisture resistance, oxidation prevention, and strong airtightness compared to traditional packaging materials, plastic films are used. The main soft packaging printing has occupied an increasingly important position in packaging and printing. It is estimated that since 1980, plastic packaging has accounted for 32% to 44% of the total printed packaging in some advanced countries in the world.
In general, because the protective content of a single plastic packaging material is poor, it is difficult to meet the packaging requirements of heat resistance, moisture resistance, air permeability, and heat sealing, so composite materials are widely used, that is, after the substrate film is printed, it is composited with the heat sealing film (composite). The methods are: dry compounding, solvent-free compounding, isocyanate extrusion, and imine extruding) making a bag shape and sealing the contents. The sealing method is usually heat sealing.
The production process is as follows:
Plastic film → concave plate / flexo printing → compound → cutting → bagging → to the customer because of the packaging production process and the need for post-package processing, composite ink in addition to the hue, color strength, printing adaptability necessary in the printing process In addition to its properties, it has the following characteristics: OPP common compound ink, chlorinated polypropylene type, polyamide type, PET/NyLOn, light packaging type, modified chlorinated polypropylene, and PVB type boiled cooking type ordinary composite ink Good printing performance, composite strength, high residual solvent, if the formula design is reasonable, can meet the national standard, but must contain toluene, and domestic chlorinated polypropylene contains a very small amount of CCL4, few people use it in Europe and America, there are some in Japan Sales volume is used in large quantities in China and Southeast Asia.
Polyamide type is originally a table printing ink, many people use neoprene rubber compound with it as a composite ink, but the composite strength is poor, and when the winter temperature is low, it is easy to form a jelly, and it is not convenient to use.
The modified type of chlorinated polypropylene is added with some adhesion-enhancing resins or auxiliaries in common composite inks to improve adhesion and composite strength. The price has great advantages, but the composite strength is poor, especially at the heat-seal and with aluminum foil or When aluminizing film is compounded.
PVB type can only use alcohol, ester solvent, in line with the current environmental trends, but the water resistance is poor, not suitable for boiling, retort packaging, can be used for OPP printing. PU type can have higher composite strength (such as poor selection of resin for poor composite strength), good printing performance, can be boiled, steamed, and can also be used for OPP printing, but the price is more expensive.
Trend 1: Generalization The current status of printing plants is basically a type of special ink applied to a film, which not only uses a more complex, requires the formulation of corresponding thinner, but also causes the ink inventory to increase exponentially, due to the fierceness of modern business. The speed of competition, product development and change of packaging has been accelerated. Many packaging and printing plants are producing lots of batches, producing less and changing films frequently. If all substrates can be a type of general-purpose ink, inventory can be greatly reduced and the operation can be simplified. In Japan and Southeast Asia, PU-based general-purpose inks are now used to print PET/NyLOn/OPP, and PU inks are used in the entire composite ink. The share of sales has been rising, up to 50% to 90%.
Trend 2: Environmentally friendly inks use solvents such as toluene, ketones, esters, alcohols, or water. Relatively speaking, toluene and ketone solvents are harmful to the human body. Various governments are formulating or preparing to draw up relevant restrictions ordinances. Another development trend is:
Contains benzenes, ketones → No ketones containing ketones → No toluenes, ketone-free inks → Water-based inks and inks (alcohols, ester inks only)
Therefore, the general-purpose and environmental protection of alcohol and ester universal ink sets are the development trend of compound inks. Now that Japan has started batch production, some domestic multinational companies such as DIC and SCIPA are currently being promoted.
In general, because the protective content of a single plastic packaging material is poor, it is difficult to meet the packaging requirements of heat resistance, moisture resistance, air permeability, and heat sealing, so composite materials are widely used, that is, after the substrate film is printed, it is composited with the heat sealing film (composite). The methods are: dry compounding, solvent-free compounding, isocyanate extrusion, and imine extruding) making a bag shape and sealing the contents. The sealing method is usually heat sealing.
The production process is as follows:
Plastic film → concave plate / flexo printing → compound → cutting → bagging → to the customer because of the packaging production process and the need for post-package processing, composite ink in addition to the hue, color strength, printing adaptability necessary in the printing process In addition to its properties, it has the following characteristics: OPP common compound ink, chlorinated polypropylene type, polyamide type, PET/NyLOn, light packaging type, modified chlorinated polypropylene, and PVB type boiled cooking type ordinary composite ink Good printing performance, composite strength, high residual solvent, if the formula design is reasonable, can meet the national standard, but must contain toluene, and domestic chlorinated polypropylene contains a very small amount of CCL4, few people use it in Europe and America, there are some in Japan Sales volume is used in large quantities in China and Southeast Asia.
Polyamide type is originally a table printing ink, many people use neoprene rubber compound with it as a composite ink, but the composite strength is poor, and when the winter temperature is low, it is easy to form a jelly, and it is not convenient to use.
The modified type of chlorinated polypropylene is added with some adhesion-enhancing resins or auxiliaries in common composite inks to improve adhesion and composite strength. The price has great advantages, but the composite strength is poor, especially at the heat-seal and with aluminum foil or When aluminizing film is compounded.
PVB type can only use alcohol, ester solvent, in line with the current environmental trends, but the water resistance is poor, not suitable for boiling, retort packaging, can be used for OPP printing. PU type can have higher composite strength (such as poor selection of resin for poor composite strength), good printing performance, can be boiled, steamed, and can also be used for OPP printing, but the price is more expensive.
Trend 1: Generalization The current status of printing plants is basically a type of special ink applied to a film, which not only uses a more complex, requires the formulation of corresponding thinner, but also causes the ink inventory to increase exponentially, due to the fierceness of modern business. The speed of competition, product development and change of packaging has been accelerated. Many packaging and printing plants are producing lots of batches, producing less and changing films frequently. If all substrates can be a type of general-purpose ink, inventory can be greatly reduced and the operation can be simplified. In Japan and Southeast Asia, PU-based general-purpose inks are now used to print PET/NyLOn/OPP, and PU inks are used in the entire composite ink. The share of sales has been rising, up to 50% to 90%.
Trend 2: Environmentally friendly inks use solvents such as toluene, ketones, esters, alcohols, or water. Relatively speaking, toluene and ketone solvents are harmful to the human body. Various governments are formulating or preparing to draw up relevant restrictions ordinances. Another development trend is:
Contains benzenes, ketones → No ketones containing ketones → No toluenes, ketone-free inks → Water-based inks and inks (alcohols, ester inks only)
Therefore, the general-purpose and environmental protection of alcohol and ester universal ink sets are the development trend of compound inks. Now that Japan has started batch production, some domestic multinational companies such as DIC and SCIPA are currently being promoted.