Application of the most popular general compound i

Application of general-purpose composite ink in plastic 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. Its applicable films include 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 in general-purpose composite ink, 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). Due to the decline of characteristics, it is necessary to add% curing agent in some occasions, 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 ink, and the following is a special application: this kind of ink can also be used for the printing of polyvinyl chloride (PVC) film. Sometimes printing plants have to abandon PVC ink and choose general-purpose ink for good printing effect when printing shrunk PVC, but pay attention to controlling the addition of ketones in the dilution solvent, Too little ink solubility, including filled and reinforced unfilled materials and hard thermoplastic plates, is poor, too much is easy to dissolve the film, generally accounting 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 reflect the metallic luster of aluminized packaging, many customers choose transparent composite inks. Chlorinated polypropylene system contains a lot of non-polar solvents, and many dyes are insoluble in this system, so the color types of transparent inks are incomplete. Although the cost of general-purpose inks is slightly higher, they have a wide range of colors and higher transparency, so they have been widely used. However, the application of transparent inks should be cautious. First of all, we should pay attention to the smell, because the odor can cause the quality of the whole batch of products to be scrapped, and re passing through the oven cannot eliminate the odor. 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. Here, the effectiveness of the experimental machine and the concept of green design are gradually recognized and valued by people, and are introduced in detail

in a word, general 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. It can provide intellectual support and make greater contributions to promoting the rapid and healthy development of China's new material industry. Some applications are beyond the recommended scope of ink factories, and it is often surprising

Author: lizhiyun