How To Solve The Problem That The Film Self-adhesive Printing Is Not Good And The Ink Loss?
There are many kinds of materials for film adhesives, and their characteristics and surface treatment methods are also very different. Often in the printing process, the ink is not strong, static and other issues, how to solve it?
First,Printing ink selection and application
Select special ink for film printing, varnish and matching additives
There are many types of inks. Some inks are specially designed for film adhesive materials, even for certain film adhesive materials, so the ink must be used exclusively, and the matching varnish and additives should be used, otherwise it will appear. The printing quality problem that the ink does not match the printing material causes the ink layer to fall off.
Select the ink matching the coating of the film material to increase the firmness of the ink layer.
For film materials with a surface coating, it is necessary to select the properties and matching inks, otherwise there will be problems with ink loss. If the ink is properly selected, the resin in the ink is firmly bonded to the resin in the coating, and the ink layer does not fall off even if the ink is not completely dried.
Control the thickness of the ink layer, if necessary, can use the printing method of overprinting
Some prints require a certain thickness of the ink layer. In the case of a thick ink layer, the problem of ink loss may occur if the ink is not dried thoroughly. The best solution is to use screen printing and gravure printing. For unconditional printers, you can consider the same color ink printing twice. The usual method is to first print a very thin layer of ink, and then print it again on the surface after it is completely dried, so that after two printings, the thickness of the ink layer can be improved, and the problem of the firmness of the ink is solved, and the process is achieved.
Control the drying speed of the ink
Pay attention to the expiration date of the ink, and add a small amount of desiccant when the ink is dry slowly to increase the drying speed.
Ensure the drying or curing energy of the ink
Regular cleaning of the ink curing unit and periodic replacement of the UV lamp are key to ensuring complete curing of the UV ink. The efficiency and state of the UV curing device are periodically checked with an instrument or test paper, and the thickness of the ink layer and the printing speed are adjusted based on the data to achieve an optimum printing effect.
When printing in multi-color, control the printing speed to ensure the ink layer is completely dry.
For multi-color printing labels, high-speed printing is not recommended. It is recommended that the printing speed be controlled at 30 to 50 m/min to ensure that the printing ink layer is completely dry and waste is reduced.
Second,Elimination of static electricity
Static electricity is one of the most prone to quality problems when printing film self-adhesive materials. Eliminating static electricity and controlling static electricity within a certain range is necessary for film self-adhesive material printing. Eliminating static electricity has two requirements for printing companies: one is environmental requirements, and the other is to add corresponding static elimination devices to the equipment.