Special Printing
Special printing inks brief security and development trends
The surface of the plastic substrate UV inks Increasingly popular printing or UV coating, and this is challenging work items. Plastic printing material used in the printing industry are decades old, with the UV ink / varnish of the popular plastic substrates in UV ink printing on printers and ink manufacturers to put forward new issues, the biggest problem is how to to UV ink / varnish is firmly adhered to the plastic substrate surface, that attachment issues.
1. Plastic substrate surface tension Plastic printing, plastic substrates of the surface tension is the primary factor to consider first. Many plastic films have not been before, its surface tension is very low, generally need to be surface treatment to improve the plastic substrate surface tension, treatment generally 40 dyne / cm or higher. Typically, the supply of plastic manufacturers for plastic substrates were surface treatment, but treatment effect will soon be lost.
On the printer, the connection handle is the best solution to ensure the printing plastic substrates surface tension is maintained in the acceptable range. Corona discharge (oxidation) process is the most common approach, it is used in a variety of surface treatment of plastic film, and will not damage those of temperature-sensitive plastic substrates. High frequency high voltage corona discharge or the frequency high-voltage discharge, on the plastic surface treatment, to surface activation, was porous, plastic film surface to enhance adhesion of the ink to improve the film's printability. For example; common PE (polyethylene) film through corona discharge treatment, the PE molecular chain generated carboxyl, carbonyl and other unsaturated bonds. Surface after oxidation, so PE molecules into a polar molecule, an increase of surface energy. Usually, PE treatment from the surface tension of 31 dyne / cm up to 39-40 dyne / cm, thus increasing the PE film on the UV ink / varnish wetting and adhesion, thus enhancing the degree of imprinting of solid . More
Flame temperature of the plastic products used for surface treatment, to make plastic under high temperature in an instant to remove surface oil and melt the surface layer to enhance the ability to dwell; also use chemical treatment, but that This method usually used in conjunction with corona discharge treatment methods, chemical treatment method using oxidants on the surface of polyolefin plastics processing, so that on the surface of polar groups, so that plastic substrate surface of the UV ink / varnish to good wet adhesion. To test the plastic substrate surface treatment effect, the best manufacturers of plastic film printed with dyne test pen.
Treatment of plastic film, the surface tension of ink is lower than the surface tension of plastic films. Similarly, in order to make the surface wet varnish in the ink well and firmly adhered to the surface of ink and varnish to the surface tension is lower than the ink surface tension. Therefore, UV ink formulations on the selection of raw materials, very sophisticated, it is acceptable to have access to surface tension. Study a wide range of ink formulations found Solvent Surface tension of inks generally low compared with other types of ink, it can shop a variety of plastic film to start wetting the surface. Therefore, the plastic substrate surface treatment, especially when UV inks particularly critical.
UV plastic printing plastic commonly used in surface tension values (temperature: 20 degrees Celsius)
Plastic substrate surface tension (dyne / cm)
Polyethylene (PE) 31 Polypropylene (PP) 34 Polyvinyl chloride (PVC) 33-39 Polystyrene (PS) 33 Polyester (PET) 43
PVDC
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I am an expert from China Quality Lighting, usually analyzes all kind of industries situation, such as sirf gps receiver , tomtom gps antenna.
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