Application of the most popular general compound i

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The application of general-purpose composite ink in flexible packaging

plastic intaglio ink is generally divided into surface printing ink and internal printing composite ink. The so-called general-purpose composite ink refers to the composite ink that can be used on a variety of films, including polyester (PET) film, nylon (NY) film, biaxially oriented polypropylene film (BOPP), k-coated film (Kop), cellophane (PR), etc

generally speaking, polyurethane resin is often used for general-purpose composite inks, and polyvinyl butyral (PVB) resin is also used. This paper only discusses the types of polyurethane. This kind of ink can be used in frozen food packaging, dry food packaging, portable packaging, water containing food packaging, boiling food and high-temperature cooking food packaging. In most cases, only one component can be used (i.e. without adding curing agent). In some occasions, it is necessary to add% curing agent, such as the storage temperature of frozen food below minus 18 ℃, the cooking and packaging of nylon film above 100 ℃, and other occasions that need to improve the composite strength and chemical resistance

because this kind of ink can be used for cooking, it is also called cooking ink or nylon ink. However, it should be noted that not every color can meet the purpose of cooking. Because some pigments, especially red, yellow and orange, will migrate under high temperature and high pressure, you must carefully read the instructions of the ink when making cooking bags. Ye's ink (Zhongshan) company's general composite ink is GLP series. In order to prevent this kind of phenomenon, the color of ink that is not resistant to cooking and boiling is specially marked as light packaging on the packaging barrel of GLP series ink

it also has a wide range of compounding methods, which can be applied to dry compounding, solvent-free compounding and extrusion compounding. Due to the poor adhesion of polyurethane used in the ink to OPP film, if PP is to be extruded, the chlorinated polypropylene type internal printing compound ink should be used instead of white. For dry compounding, if it can be compounded after printing hours, the composite strength can be greatly improved

the above is an overview of general-purpose composite inks, and the following is a description of special applications: this kind of inks can also be used for the printing of polyvinyl chloride (PVC) films. Sometimes printing plants have to abandon PVC inks and choose general-purpose inks for good printing effect when printing shrunk PVC. However, pay attention to controlling the amount of ketones in the dilution solvent. Too little ink has poor solubility, and too much ink is easy to dissolve the film, Generally, it is appropriate to account for 20% of the diluted solvent. When a printing factory printed the package of "Hainan coconut sugar", the adhesion became poor because the general surface printing ink could not resist the smell in the sugar. As recommended by our company, PVC is printed on the surface of this kind of ink, and then covered with a layer of two-component varnish. As a result, similar accidents are successfully avoided

general purpose inks are also widely used in transparent packaging. In dry food packaging, many structures are composite aluminized packaging. In order to reduce the energy consumption of 100 million tons of standard coal, it reflects the metallic luster of aluminized. Many customers choose transparent composite inks. Chlorinated polypropylene system contains a lot of non simultaneous polar solvents, and many dyes are insoluble in this system. Therefore, the color types of transparent inks are incomplete. Although the cost of general-purpose ink is slightly higher, it has a wide range of colors and higher transparency, so it has been widely used. However, the application of transparent ink to provide mechanical and technical support should be cautious. First of all, we should pay attention to the smell, because the smell can cause the quality of the whole batch of products to be scrapped, and the re operation is simple and safe. Passing through the oven cannot eliminate the smell. The second is the composite strength. The type and color of dyes will have a great impact on the composite strength. As for other precautions: for example, it is easy to be dissolved by glue when drying, and it is easy to be dissolved by solvent when extruding and applying AC agent, which all need to be coordinated in the process of printing and compounding

some manufacturers have slightly improved the general-purpose composite oil ink, or added two-component gloss oil, or added wear-resistant additives to the ink for surface printing and cooking resistant milk packaging, which will not be introduced in detail here

in a word, general-purpose composite ink is widely used in flexible packaging. It can be used not only for internal printing composite ink, but also for surface printing ink. Some applications are beyond the recommended scope of ink factories, and it is often surprising

source: master printer

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