When choosing gravure inks, we must first consider a few factors: on what substrate to print ? What kind of machine is used for printing? What kind of effect do you want? What are the post-print processing and end-product use conditions? Ink manufacturers are now fiercely competitive and have a large selection of products, which may also dazzle our color printing plants. Before printing, confirm the above points. Both choose the ink with the best performance and price ratio, and can reduce or avoid the occurrence of printing failures. . Ink suppliers should not be too many, not more than three. Ink of different brands cannot be blended and used, which causes a lot of waste of remaining ink; maybe some color printing manufacturers hold the mentality of occupying ink supplier funds, but the business should be Sincerity-based, it is necessary to pay sooner or later, there is no need for this.
There are three common types of ink on the market: polyamide type surface printing ink, chlorinated polypropylene type compound ink, and polyurethane ink. Choose different matching inks for different substrates. For printing BOPP, chlorinated polypropylene compound ink is used. If compounding is not needed, polyamide-type surface printing ink is used. If general-purpose polyurethane ink is used for printing BOPP, not only the cost is high, but also the adhesion fastness does not meet the requirements. NY, PET film must be printed with polyurethane ink. If it is printed with chlorinated polypropylene ink, it is prone to failures such as low peel strength and high temperature delamination. The adhesion of polyamide type ink to PE film is particularly good, but it can only be used for general dry packaging. When making high temperature, grease and water resistant packaging, such as milk film and bottle label, polyurethane ink should be preferred.
There are several basic indicators of ink that our color printing companies should test : viscosity, fineness, hue, and fastness to adhesion. The necessary test tools include scraper (contrast hue, measurement of adhesion fastness), 3 # Cha Enhuai (viscosity), fineness plate (fineness). When testing viscosity, it is best to dilute it to a specific viscosity (for example, 18 seconds / 25 ° C) with the supporting mixed solvent, and calculate the amount of solvent added, so as to eliminate the "false viscosity" phenomenon that some inks may bring (ink see It's very thick, but it doesn't add solvent). The test of adhesion fastness can use the national standard (GB / T 13217.7-2009), but it may not be enough for some surface printing inks. It is best to simulate the specific requirements of product packaging and post-processing conditions.
The good ring of solvent quality directly affects the quality of ink printing, but for general SMEs, the solvent quality is the most difficult to grasp. The main indicators to distinguish between good and bad solvents are purity and moisture content. The quantitative and qualitative detection of solvents is best detected by chromatography, but the required instruments are more expensive and the technical requirements are higher. If it is just for printing, and does not consider the dry composite process, here is a simple and practical method. Judging from the appearance of the solvent, at least it should be clear and transparent. If there is turbidity or floating matter, the solvent should be used with caution. Smell the smell of the solvent, after a long time of contact with the commonly used solvents, the operator has a general impression of the smell of a particular solvent. If the smell of the batch of solvents is found to be impure, it can be sure that the batch of solvents is not high in purity and the impurities many.
There are many factors that affect the quality of printing. How to better grasp the quality of printed matter, each color printing company has its own management method. The quality control of raw materials is the most basic and critical process requirement in the color printing process. It is difficult to imagine that unqualified or inappropriate raw materials can guarantee the production of quality printed products. Therefore, our color printing enterprises must be durable and effective The quality of raw materials is critical.
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