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It is reported that as of now, China has introduced more than 400 gravure printing production lines, while domestic gravure printing production also has more than 300. With the improvement of the quality of printed products and the increase of gravure printing machines in the packaging industry, the demand for gravure printing inks in China has increased year by year. According to different printing substrates, gravure printing inks can be divided into gravure inks for paper and gravure inks for plastics. Paper gravure printing ink is mainly used to print paper products such as cigarette labels, wine labels, various coated papers and composite packaging papers. Its ink structure is mainly based on solvent-based inks, and plastic gravure inks are often divided into table printing and Two composite inks, mainly used for printing PE, PP, OPP, PET, NY, PVC, PS, AL and various coating films and other thin film printing products, but also can print composite soft packaging without large color blocks in printing products. Its ink structure is mainly based on solvent inks.
Plastic gravure printing inks are mainly divided into two categories: printing inks and composite inks (composite inks are also called printing inks).
In addition to printing, there are many post-processing steps in the manufacture of plastic flexible packaging, so be sure to pay attention to the relatedness of each process. No matter if it is a surface printing or compound ink, the appearance index such as the color, adhesion, and dryness of the ink product must be checked before printing. If it meets the printing requirements, if it does not meet the requirements, the printing should be stopped immediately, and the reason for the problem should be analyzed. , is the wrong color to carry out recovery, do not detect when printing, to print only after the discovery of the product does not work, leading to unnecessary losses, which is necessary to pay attention when printing.
Table printing inks are now decreasing year by year due to limitations in their application areas. Composite inks are increasing year by year due to their wide range of printing and high grades of printed materials. Composite inks are dominated by OPP film inks for food packaging, occupying about 70% of the entire compound ink. Plastic surface printing inks are generally produced from polyamide as the main resin. The main components are binders, polyamide resins, pigments and additives. They are mainly used for surface-treated OPP and BOPP. PET, PA and other film surface printing. In production, the softening point of the polyamide resin should be strictly controlled at around 121°C. Otherwise, due to the lower softening point of the resin and printing at high humidity, the phenomenon of sticking of the printed product will occur. If the softening point of the resin is high, then When it is used in winter, it will freeze. Before use, it needs to be heated and stirred to make it printable. Dilution solvents for plastic intaglio printing inks are mainly alcohols and benzenes. In order to adjust the viscosity of inks, some ester solvents may also be added in a timely manner. However, ketones and other aromatic solvents are generally not added because these solvents are added. It is easy to damage the ink. Commonly used alcohols and benzenes are toluene, isopropanol, xylene, butanol, among which toluene, isopropanol are fast drying solvents, xylene, and butanol are slow-drying solvents. However, when using butanol, it is necessary to pay attention that if the ink is dried too quickly, it will cause the loss of part of the image and dot network, and by properly adding butanol, the reproducibility of the ink will be significantly improved, and the small print and halftone dots will become clear. Increasing the amount of butanol will cause the ink to dry too slowly, resulting in dirty prints, especially in the mildew season.
Plastic gravure compound ink, also known as ink printing, refers to the ink printed on the substrate. The general composite plastic ink is produced from chlorinated polypropylene series resin and has high adhesion to OPP, PET, BOPPP and other film printing substrates. After compounding, the ink is sandwiched in the inner layer and is the highest grade of printing. Ideal ink for plastic soft bags. The diluent solvent is mainly ketones, esters, benzene solvents, and is generally not diluted with alcoholic solvents. The addition of alcoholic solvents can cause the ink to be destroyed, and the inks can be thickened or appear to be "tofu flowers". Can't print. Commonly used diluents mainly include ethyl ketone, methyl ethyl ketone, ethyl acetate and toluene, among which methyl ethyl ketone, toluene, and ethyl acetate are fast-drying solvents. Butyl ketone is a slow-drying solvent. In printing production, ink drying properties can be adjusted. Through different ketone, benzene, ester solvent ratios to achieve the printing requirements. Of course, due to the different ink manufacturers, their ink performance is not exactly the same, so in practice, the printer should determine the ink selection by the speed of the gravure printing machine. Otherwise, the rotary speed of the gravure printing machine is slow, and the gravure printing machine rotates the gravure printing machine at a high speed in the gravure network, and the printing can not be completely dried, resulting in the printing product being dirty. For composite packaging, especially cooked food packaging, it is generally printed on PET or PA film. Polyamine and other cooking-resistant two-component gravure inks should be used to achieve better adhesion fastness, composite fastness, and cooking performance. . Otherwise, if you do not achieve the effect of cooking, the printed product will appear compound after the inner layer of the ink through the cooking thinning, color distortion, the picture is not clear and so on. In addition, in the production of retort pouches, it is also necessary to select high-temperature resistant materials and retort-resistant two-component adhesives.
The surface tension of plastic gravure ink is generally 36 dyne, while the surface tension of PE and OPP is generally only about 32 dyne. This requires that in gravure printing, the film undergo corona treatment to destroy the molecular structure of the plastic surface and improve the film. Surface tension, so that it reaches 38 dynes or more, so that ink and film affinity and adhesion, hand smashed and adhesive tape can not tear the ink before they meet the printing quality requirements.
Plastic gravure inks have effects on the ozone layer due to chlorinated polymers in production. Toluene is used in gravure printing to dissolve and regulate the viscosity of inks, which is harmful to the health and safety of workers. This requires ink manufacturers to develop them as soon as possible. Low toxicity, non-toxic alcohol-soluble and water-soluble gravure plastic printing ink. We use plastic flexo inks in the production of paper-plastic composite webs (for users to self-assemble machine-packed pharmaceuticals, tea bags, etc.) and the production of liquid packaging film webs. This ink is drunk-soluble, and the solvents added are alcohols and esters, which have low toxicity and achieve odorless and benzene-free hygiene requirements.
In short, the selection and application of plastic gravure printing inks depends on many factors such as the performance of different gravure printing machines and the proficiency of operators. To know what material is printed on, what is the speed of the gravure printing machine, how fast the ink is dry, whether the printing color is consistent with the original, whether the post-press processing meets the requirements and the purpose of the final product, different printing requires the selection of the corresponding ink Never use different inks instead. Only by choosing the right ink and adding the right operation can we create high-quality printing and packaging products.
Plastic gravure printing inks are mainly divided into two categories: printing inks and composite inks (composite inks are also called printing inks).
In addition to printing, there are many post-processing steps in the manufacture of plastic flexible packaging, so be sure to pay attention to the relatedness of each process. No matter if it is a surface printing or compound ink, the appearance index such as the color, adhesion, and dryness of the ink product must be checked before printing. If it meets the printing requirements, if it does not meet the requirements, the printing should be stopped immediately, and the reason for the problem should be analyzed. , is the wrong color to carry out recovery, do not detect when printing, to print only after the discovery of the product does not work, leading to unnecessary losses, which is necessary to pay attention when printing.
Table printing inks are now decreasing year by year due to limitations in their application areas. Composite inks are increasing year by year due to their wide range of printing and high grades of printed materials. Composite inks are dominated by OPP film inks for food packaging, occupying about 70% of the entire compound ink. Plastic surface printing inks are generally produced from polyamide as the main resin. The main components are binders, polyamide resins, pigments and additives. They are mainly used for surface-treated OPP and BOPP. PET, PA and other film surface printing. In production, the softening point of the polyamide resin should be strictly controlled at around 121°C. Otherwise, due to the lower softening point of the resin and printing at high humidity, the phenomenon of sticking of the printed product will occur. If the softening point of the resin is high, then When it is used in winter, it will freeze. Before use, it needs to be heated and stirred to make it printable. Dilution solvents for plastic intaglio printing inks are mainly alcohols and benzenes. In order to adjust the viscosity of inks, some ester solvents may also be added in a timely manner. However, ketones and other aromatic solvents are generally not added because these solvents are added. It is easy to damage the ink. Commonly used alcohols and benzenes are toluene, isopropanol, xylene, butanol, among which toluene, isopropanol are fast drying solvents, xylene, and butanol are slow-drying solvents. However, when using butanol, it is necessary to pay attention that if the ink is dried too quickly, it will cause the loss of part of the image and dot network, and by properly adding butanol, the reproducibility of the ink will be significantly improved, and the small print and halftone dots will become clear. Increasing the amount of butanol will cause the ink to dry too slowly, resulting in dirty prints, especially in the mildew season.
Plastic gravure compound ink, also known as ink printing, refers to the ink printed on the substrate. The general composite plastic ink is produced from chlorinated polypropylene series resin and has high adhesion to OPP, PET, BOPPP and other film printing substrates. After compounding, the ink is sandwiched in the inner layer and is the highest grade of printing. Ideal ink for plastic soft bags. The diluent solvent is mainly ketones, esters, benzene solvents, and is generally not diluted with alcoholic solvents. The addition of alcoholic solvents can cause the ink to be destroyed, and the inks can be thickened or appear to be "tofu flowers". Can't print. Commonly used diluents mainly include ethyl ketone, methyl ethyl ketone, ethyl acetate and toluene, among which methyl ethyl ketone, toluene, and ethyl acetate are fast-drying solvents. Butyl ketone is a slow-drying solvent. In printing production, ink drying properties can be adjusted. Through different ketone, benzene, ester solvent ratios to achieve the printing requirements. Of course, due to the different ink manufacturers, their ink performance is not exactly the same, so in practice, the printer should determine the ink selection by the speed of the gravure printing machine. Otherwise, the rotary speed of the gravure printing machine is slow, and the gravure printing machine rotates the gravure printing machine at a high speed in the gravure network, and the printing can not be completely dried, resulting in the printing product being dirty. For composite packaging, especially cooked food packaging, it is generally printed on PET or PA film. Polyamine and other cooking-resistant two-component gravure inks should be used to achieve better adhesion fastness, composite fastness, and cooking performance. . Otherwise, if you do not achieve the effect of cooking, the printed product will appear compound after the inner layer of the ink through the cooking thinning, color distortion, the picture is not clear and so on. In addition, in the production of retort pouches, it is also necessary to select high-temperature resistant materials and retort-resistant two-component adhesives.
The surface tension of plastic gravure ink is generally 36 dyne, while the surface tension of PE and OPP is generally only about 32 dyne. This requires that in gravure printing, the film undergo corona treatment to destroy the molecular structure of the plastic surface and improve the film. Surface tension, so that it reaches 38 dynes or more, so that ink and film affinity and adhesion, hand smashed and adhesive tape can not tear the ink before they meet the printing quality requirements.
Plastic gravure inks have effects on the ozone layer due to chlorinated polymers in production. Toluene is used in gravure printing to dissolve and regulate the viscosity of inks, which is harmful to the health and safety of workers. This requires ink manufacturers to develop them as soon as possible. Low toxicity, non-toxic alcohol-soluble and water-soluble gravure plastic printing ink. We use plastic flexo inks in the production of paper-plastic composite webs (for users to self-assemble machine-packed pharmaceuticals, tea bags, etc.) and the production of liquid packaging film webs. This ink is drunk-soluble, and the solvents added are alcohols and esters, which have low toxicity and achieve odorless and benzene-free hygiene requirements.
In short, the selection and application of plastic gravure printing inks depends on many factors such as the performance of different gravure printing machines and the proficiency of operators. To know what material is printed on, what is the speed of the gravure printing machine, how fast the ink is dry, whether the printing color is consistent with the original, whether the post-press processing meets the requirements and the purpose of the final product, different printing requires the selection of the corresponding ink Never use different inks instead. Only by choosing the right ink and adding the right operation can we create high-quality printing and packaging products.
BNF HARDWARE CO., LTD , https://www.bnfhardware.cn