With the increasingly fierce competition in the packaging box printing market, if you want to have a foothold in the market, only quality assurance is far from enough. While ensuring quality, you must also focus on product packaging design; All aspects are considered and handled well in order to make qualified and customer-satisfied products, that is, what we call details determine success or failure. So what details should we pay attention to during the printing process?
The thickness and area of the ink on the substrate
When the packaging box is printed, the thickness of the ink on the substrate will directly affect the quality of the printed product. Sometimes we will encounter such as the print area is too large, which makes it difficult for the ink layer to adhere to the plastic film. Cause delamination, blistering and other phenomena. The main reason for this phenomenon is uneven ink reception, which hinders the penetration and spreading effect of the adhesive on the paper. Therefore, the amount of printed ink must be strictly controlled during the packaging box printing process, and we generally control it at 2-3um.
Second, the ink used when printing the packaging box
For products that need to be coated in packaging box printing, fast-setting bright offset printing inks should be used. Because of the fast-setting bright offset printing ink, its binder is composed of synthetic resin, dry vegetable oil, high boiling point kerosene, etc. The molecular groups in these synthetic resins and the molecular groups in the cross-adhesive will expand and penetrate each other, produce cross-links, and form a physical and chemical bonding force, which is more conducive to coating.
Whether the surface of the substrate is good
If the dry condition of the inner layer of the substrate is not good, it will greatly affect the quality of the film and cause quality problems such as blistering and delamination. There are many factors that affect the drying of the ink layer on the surface of the printed matter, such as the type of ink, the amount of desiccant, the structure of the paper, the temperature and humidity of the workshop environment, and so on. Therefore, we must pay special attention to the dryness of the ink layer when printing. Datong strictly controls the water and ink balance when printing, pay attention to the emulsification of the ink, and control the acid value of the fountain solution. At the same time, control the temperature and humidity of the workshop. Make the surface and inside of the packaging printed matter truly dry, so that the quality of the film can be guaranteed.
Fourth, the addition and release of printing powder
In order to adapt to the high-speed printing of multi-color machines and prevent the backside of the paper from being dirty during printing, packaging offset printing is often solved by powder spraying. The powder sprayed is mostly composed of cereal starch and natural suspended matter. These powder particles are coarse. If too much powder is sprayed during the printing process, these powder particles will float on the surface of the printed matter. When laminating, the adhesive is not always combined with the ink layer, which will seriously affect the quality of the laminating film. Therefore, the amount of powder sprayed must be strictly controlled during packaging offset printing. It is recommended to use a small amount of powder spray on the premise of not sticking to dirt. Packaging box printing is not a simple job, but to consider many aspects of details.