Factors Affecting Film Printability
DATE：2019/9/6 8:52:20 / READ： / SOURCE：This station
Factors affecting film printability
There are three main factors in the quality of printing, one is the substrate, the second is the ink, and the third is the mechanical equipment.
The main factors affecting the printability of the film are summarized as follows:
(1) Effect of solvent
The solvent effect of the plastic film and the ink directly affects the printability. For example, the polystyrene film is easily dissolved by most organic solvents other than ethanol, and as a result, the film breaks and bonds during the printing process. The polyvinyl chloride film is expanded by the action of an ester or a ketone solvent, and the shrink film of the polyvinyl chloride often shrinks in contact with the solvent, so that a special printing ink should be considered.
(2) Influence of moisture
Water-affected materials, glass paper, polyvinyl alcohol, polyamide and other films with water affinity
Large, due to moisture absorption, it produces slacks and wrinkles in printing, and has an effect on the adhesion and fastness of the ink. Therefore, it is necessary to control the humidity and temperature of the workshop.
(3) The effect of static electricity
The film is printed at high speed. If there is no antistatic agent, it will easily generate static electricity, affect the printing effect, and it is prone to sparks and cause fire.
(4) Effect of film deformation and stretchability
Deformation of the film is often difficult to register. Plastic film is affected by tension and temperature during the printing process, and after being subjected to external force, its own deformation and stress relaxation affect the deformation of the film, causing inaccurate overprinting. Therefore, constant tension and temperature control of the equipment are important.
(5) Effect of resin coating
Coating with various resins, the printing property is also difficult to control due to the variety of coating resins, and the test should be carried out, and then the ink is selected from the test results. Such as: K coated cellophane, it has already left a part of the solvent, and then printed, should pay attention to the amount of residual solvent.
(6) Surface treatment
For plastic films with low surface tension, such as polyethylene and polypropylene, they must be chemically treated or
Corona treatment and other methods to improve the surface tension of the material, generally used for printing and packaging, should be more than 38mN / m, and must be 40mN / m for cooking heating.
(7) Selection of ink
In recent years, plastic film printing technology has developed rapidly, printing speed is fast, quality is good, and printing
The types of materials are diversified, and the adaptability of inks is different depending on the subsequent processes and end uses. Therefore, the choice of ink is very important.
The formulation and use of gravure inks, which are also composed of various colorants, resins, solvents and other additives, all of which affect film printing performance.
There are three main factors in the quality of printing, one is the substrate, the second is the ink, and the third is the mechanical equipment.
The main factors affecting the printability of the film are summarized as follows:
(1) Effect of solvent
The solvent effect of the plastic film and the ink directly affects the printability. For example, the polystyrene film is easily dissolved by most organic solvents other than ethanol, and as a result, the film breaks and bonds during the printing process. The polyvinyl chloride film is expanded by the action of an ester or a ketone solvent, and the shrink film of the polyvinyl chloride often shrinks in contact with the solvent, so that a special printing ink should be considered.
(2) Influence of moisture
Water-affected materials, glass paper, polyvinyl alcohol, polyamide and other films with water affinity
Large, due to moisture absorption, it produces slacks and wrinkles in printing, and has an effect on the adhesion and fastness of the ink. Therefore, it is necessary to control the humidity and temperature of the workshop.
(3) The effect of static electricity
The film is printed at high speed. If there is no antistatic agent, it will easily generate static electricity, affect the printing effect, and it is prone to sparks and cause fire.
(4) Effect of film deformation and stretchability
Deformation of the film is often difficult to register. Plastic film is affected by tension and temperature during the printing process, and after being subjected to external force, its own deformation and stress relaxation affect the deformation of the film, causing inaccurate overprinting. Therefore, constant tension and temperature control of the equipment are important.
(5) Effect of resin coating
Coating with various resins, the printing property is also difficult to control due to the variety of coating resins, and the test should be carried out, and then the ink is selected from the test results. Such as: K coated cellophane, it has already left a part of the solvent, and then printed, should pay attention to the amount of residual solvent.
(6) Surface treatment
For plastic films with low surface tension, such as polyethylene and polypropylene, they must be chemically treated or
Corona treatment and other methods to improve the surface tension of the material, generally used for printing and packaging, should be more than 38mN / m, and must be 40mN / m for cooking heating.
(7) Selection of ink
In recent years, plastic film printing technology has developed rapidly, printing speed is fast, quality is good, and printing
The types of materials are diversified, and the adaptability of inks is different depending on the subsequent processes and end uses. Therefore, the choice of ink is very important.
The formulation and use of gravure inks, which are also composed of various colorants, resins, solvents and other additives, all of which affect film printing performance.
Author：admin