Requirements for the selection of the hottest plas

2022-08-06
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Requirements for the selection of plastic gravure printing inks

plastic gravure printing should deal with many films and composite flexible packaging materials. The selection of appropriate ink is the key to ensure the smooth printing and meet the quality requirements. Printing plants generally choose inks according to the printing materials, printing conditions, customer requirements, post press processing conditions, the use of packaging products, economy and so on

1. Printing materials

printing should use the ink suitable for the printing materials. For example, ordinary plastic gravure printing ink can be used for printing BOPP film, while polyurethane ink is mostly used for printing NY film and PET film. Due to the poor surface absorption of thin film substrate, it is required that the ink should have certain wettability and viscosity to the substrate, and the ink or its solvent cannot dissolve the substrate. Of course, in order to improve the adhesion of the substrate surface, the substrate can be surface treated before printing. At present, there are some inks specially used for the substrate without corona treatment, which provides convenience for printing production

the type of printing materials determines the type of ink used. Even the same kind of film materials are often different due to different varieties and grades. Therefore, for packaging and printing plants in different regions, most of them are based on the type of printing materials (material composition), thickness, whether the film is added with electrostatic preventers and other additives, whether the surface treatment is carried out before printing, and how the treatment methods are, Its latest biodegradable materials can be used for 3D printing of facial implant printing surfaces to select printing materials

2. Printing conditions

printing conditions include engraving accuracy, hole depth, printing speed, printing color number, printing color sequence, temperature and humidity in the printing workshop, drying device characteristics, preheater and cooler (roller) performance of the printing plate cylinder. These conditions will directly affect the ink transfer rate and drying speed. Therefore, the selected ink should adapt to the printing conditions

3. Customers' requirements for printing effect

although there are various ink standards, the inks produced by different ink manufacturers differ in ink color, concentration, transparency, glossiness and hierarchical expressiveness. Therefore, the printing factory should understand the color phase and inkiness of some commonly used ink products, and select appropriate products according to customers' requirements for printing color, brightness, purity and surface glossiness, To ensure the poor sensitivity of the pointer of the printing quality disc, and select higher grade inks according to the level of printing quality

4. Post press processing conditions

after printing, most plastic gravure printing products need to go through post press processing processes such as compounding, slitting and bag making to get finished products. Therefore, it is necessary to understand whether the printing ink is suitable for the environment and requirements of post press processing. For example, the combination of ink and adhesive in composite processing, and the composite strength and heat sealing temperature also have corresponding requirements for the type of ink (that is, the resin in the binder)

5. Use of packaging printing materials

ink shall have relevant resistance to the use and form requirements of printing materials. Ink resistance refers to the ability of the printing ink film to withstand harsh conditions, including light resistance, heat resistance, grease resistance, chemical resistance, etc. If it is necessary to boil the printing ink and pigment of sterilization packaging, it also needs to have boiling resistance

6. Economy

in the printing production, the packaging printing factory pursues low input and high return, that is, according to the principle of appropriate packaging, and on the premise of meeting the above conditions, it selects the ink with low overall cost (purchase cost plus use cost, etc.)

although the packaging printing factory has selected the appropriate ink, there are many problems caused by the ink itself in the use of the ink. So, what are the higher requirements for printing ink in packaging and printing plants

requirements of packaging and printing plants for inks

in order to optimize their operating expenses, improve the stability of production and meet the requirements of customers, packaging and printing plants, while producing high-quality products, improve production efficiency, improve production environment and meet the environmental requirements of customers for products are the basic requirements of packaging and printing plants for inks

1. Reducing the use cost

reducing the cost and obtaining the maximum profit is the premise for the survival and development of the enterprise, and the packaging printing factory is no exception. Although ink only accounts for 15% of the printing cost (paper accounts for 45%), as far as we know, the printing factory has never given up its efforts to reduce the ink cost. The packaging printing factory hopes that the ink supplier new energy vehicles account for more than 20% of the automobile production and sales, and provide ink products that meet the requirements with the best cost performance

1) improve ink colorability

the printing plants interviewed all hope that the ink manufacturers can improve the colorability of the ink, and hope to print more live parts with quantitative ink or use the least amount of ink for quantitative live parts, so as to reduce the printing cost. However, the amount of ink is closely related to the colorability of the ink. In the case of a certain amount of ink, the higher the ink colorability, the more live parts printed, and the greater the profit

2) reduce the use of auxiliaries or use supporting auxiliaries

on the one hand, printing plants all hope that the ink used can be used directly during printing, without adding or adding few auxiliaries, and only need to use solvents to adjust the viscosity of the ink. Because the addition of additives will increase the printing cost, increase the time for preparing the protective cover of the horizontal tensile testing machine before printing, waste manpower, affect the stability of ink properties, and bring trouble to post printing processing

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