Plastic gravure should handle many films and composite flexible packaging materials. Choosing the right ink is the key to ensure the smooth printing and meet the quality requirements. Printing companies generally choose ink according to the printing materials, printing conditions, customer requirements, post-press processing conditions, the use of packaging products, and economics.
1. Printing materials
Printing should use inks that are compatible with the printing materials. For example, the printed plastic BOPP film can be made of common plastic gravure ink, and the printed NY film and PET film are mostly polyurethane ink. Due to the poor surface absorption of the film-like substrate, the ink is required to have certain wettability and stickiness to the substrate, and the ink or the solvent therein cannot dissolve the substrate. Of course, in order to improve the adhesiveness of the substrate surface, the substrate may be surface-treated before printing. At present, there are some inks that have been specially used for non-corona treatment of the substrate, which provides convenience for printing production.
The type of printing material determines the type of ink used. Even the same type of film material often varies depending on the type and grade of the film. Therefore, for packaging and printing companies in different regions, the types of materials (material composition), thickness, and thin film are mostly used. Whether or not anti-static agent and other additives are added, and whether the surface treatment, processing method, and printing surface are selected before printing.
2. Printing conditions
The printing conditions include the engraving accuracy of the plate cylinder, the depth of the cell depth, the printing speed, the number of printing colors, the printing color sequence, the temperature and humidity of the printing shop, the characteristics of the drying device, the preheater and the cooler (roller) performance, and the like. These conditions will directly affect the ink transfer rate and drying speed. Therefore, the ink used should be compatible with the printing conditions.
3. Customer's requirements for printing effect
Although there are various ink standards, the inks produced by different ink manufacturers have differences in ink color, density, transparency, glossiness, and level expression. Therefore, the printing factory should understand the hue of some commonly used ink products. Ink, and according to the customer's requirements for the hue, brightness, purity, surface gloss of the printed matter to select the right product to ensure the printing quality, and according to the level of printing quality, targeted selection of high-grade ink.
4. Postpress processing conditions
Most plastic gravure products have to undergo post-printing processes such as compounding, slitting, and bagging to obtain finished products after they are printed. Therefore, it is necessary to understand whether the printing ink is suitable for the environment and requirements of post-printing processing. For example, the combination of ink and adhesive in the composite processing, and the composite strength and heat sealing temperature also have corresponding requirements for the type of ink (ie, the resin in the binder).
5. Use of packaging prints
The ink should have relevant resistance to the uses and morphological requirements of the printed product. The resistance of the ink is the ability of the ink film to withstand harsh conditions, including light resistance, heat resistance, grease resistance, chemical resistance, and the like. If you need to boil sterilization packaging printing inks and pigments also need to have boiling resistance.
6. Economical
In printing production, packaging and printing plants pursue low input and high returns, that is, according to the principle of proper packaging, under the precondition of meeting the above conditions, inks with lower overall costs (purchasing costs and usage costs, etc.) are selected.
Although packaging and printing companies have chosen the right ink, there are also many problems caused by the ink itself during the use of the ink. So, what are the higher requirements for packaging inks for packaging and printing plants?
Packaging Printing Factory Requirements for Inks
In order to optimize its own operating expenses, improve the stability of production, and meet the requirements of customers, packaging and printing plants increase the production efficiency, improve the production environment, and satisfy the customers' environmental requirements for packaging. The basic requirements of the factory for ink.
1. Reduce the use of cost
Reducing costs and maximizing profit are prerequisites for the survival and development of a company. Packaging and printing plants are no exception. Although ink accounts for only 15% of the printing cost (paper accounts for 45%), we understand that the printing factory has never given up its efforts to reduce the cost of ink. Packaging printers prefer ink suppliers to provide the best price/performance ratio to meet the requirements. Ink products.
1) Improve ink coloring
Several printing companies interviewed hoped that the ink production plant would improve the coloration of the ink, and hoped to print more jobs with a fixed amount of ink or use a minimum amount of ink for a fixed number of jobs to reduce printing costs. 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 jobs printed and the greater the profit.
2) Reduce the use of additives or use supporting additives
On the one hand, the printing industry hopes that the ink used can be directly used during printing, and no need to add or little additives, just use the solvent to adjust the viscosity of the ink. Adding auxiliaries will increase the printing cost, increase the preparation time before printing, waste labor, and will also affect the stability of ink properties, and will also cause troubles for post-press processing.
1. Printing materials
Printing should use inks that are compatible with the printing materials. For example, the printed plastic BOPP film can be made of common plastic gravure ink, and the printed NY film and PET film are mostly polyurethane ink. Due to the poor surface absorption of the film-like substrate, the ink is required to have certain wettability and stickiness to the substrate, and the ink or the solvent therein cannot dissolve the substrate. Of course, in order to improve the adhesiveness of the substrate surface, the substrate may be surface-treated before printing. At present, there are some inks that have been specially used for non-corona treatment of the substrate, which provides convenience for printing production.
The type of printing material determines the type of ink used. Even the same type of film material often varies depending on the type and grade of the film. Therefore, for packaging and printing companies in different regions, the types of materials (material composition), thickness, and thin film are mostly used. Whether or not anti-static agent and other additives are added, and whether the surface treatment, processing method, and printing surface are selected before printing.
2. Printing conditions
The printing conditions include the engraving accuracy of the plate cylinder, the depth of the cell depth, the printing speed, the number of printing colors, the printing color sequence, the temperature and humidity of the printing shop, the characteristics of the drying device, the preheater and the cooler (roller) performance, and the like. These conditions will directly affect the ink transfer rate and drying speed. Therefore, the ink used should be compatible with the printing conditions.
3. Customer's requirements for printing effect
Although there are various ink standards, the inks produced by different ink manufacturers have differences in ink color, density, transparency, glossiness, and level expression. Therefore, the printing factory should understand the hue of some commonly used ink products. Ink, and according to the customer's requirements for the hue, brightness, purity, surface gloss of the printed matter to select the right product to ensure the printing quality, and according to the level of printing quality, targeted selection of high-grade ink.
4. Postpress processing conditions
Most plastic gravure products have to undergo post-printing processes such as compounding, slitting, and bagging to obtain finished products after they are printed. Therefore, it is necessary to understand whether the printing ink is suitable for the environment and requirements of post-printing processing. For example, the combination of ink and adhesive in the composite processing, and the composite strength and heat sealing temperature also have corresponding requirements for the type of ink (ie, the resin in the binder).
5. Use of packaging prints
The ink should have relevant resistance to the uses and morphological requirements of the printed product. The resistance of the ink is the ability of the ink film to withstand harsh conditions, including light resistance, heat resistance, grease resistance, chemical resistance, and the like. If you need to boil sterilization packaging printing inks and pigments also need to have boiling resistance.
6. Economical
In printing production, packaging and printing plants pursue low input and high returns, that is, according to the principle of proper packaging, under the precondition of meeting the above conditions, inks with lower overall costs (purchasing costs and usage costs, etc.) are selected.
Although packaging and printing companies have chosen the right ink, there are also many problems caused by the ink itself during the use of the ink. So, what are the higher requirements for packaging inks for packaging and printing plants?
Packaging Printing Factory Requirements for Inks
In order to optimize its own operating expenses, improve the stability of production, and meet the requirements of customers, packaging and printing plants increase the production efficiency, improve the production environment, and satisfy the customers' environmental requirements for packaging. The basic requirements of the factory for ink.
1. Reduce the use of cost
Reducing costs and maximizing profit are prerequisites for the survival and development of a company. Packaging and printing plants are no exception. Although ink accounts for only 15% of the printing cost (paper accounts for 45%), we understand that the printing factory has never given up its efforts to reduce the cost of ink. Packaging printers prefer ink suppliers to provide the best price/performance ratio to meet the requirements. Ink products.
1) Improve ink coloring
Several printing companies interviewed hoped that the ink production plant would improve the coloration of the ink, and hoped to print more jobs with a fixed amount of ink or use a minimum amount of ink for a fixed number of jobs to reduce printing costs. 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 jobs printed and the greater the profit.
2) Reduce the use of additives or use supporting additives
On the one hand, the printing industry hopes that the ink used can be directly used during printing, and no need to add or little additives, just use the solvent to adjust the viscosity of the ink. Adding auxiliaries will increase the printing cost, increase the preparation time before printing, waste labor, and will also affect the stability of ink properties, and will also cause troubles for post-press processing.
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