Glossy treatment of printing of plastic packaging products

Plastic packaging products, whether it is film, bottles, trays and turnover boxes, corrugated boxes, generally have to be printed on the surface, and the surface printing quality of plastic products, in addition to the printing fastness, that is: the adhesion of ink on the surface of the product, Glossiness is also an important indicator. According to the glossiness of the printed matter, the printing of the plastic can be divided into gloss, semi-gloss and extinction. In order to make the surface of the printed material have a good gloss, generally after the surface is printed, the surface of the printed product should also be subjected to a gloss treatment.

Since most plastics have good transparency, when the plastic film or the transparent plastic product is reverse-printed, it has a good gloss, but when the positive printing, ie, the surface printing, is due to the solid contained in the ink More ingredients, often lack of gloss. The glossiness of a plastic packaging product is not only related to the glossiness and flatness of the printed surface, but also related to the composition of the printing ink and the thickness of the printed product. The higher the surface finish of the printed substrate, the better the gloss; the better the flatness, the better the gloss, and the higher the insoluble solid content in the printing ink, the worse the gloss, the higher the extinction, the thickness of the printing layer The greater the gloss, the worse.

There are the following methods for printing gloss:

(a) The coating agent is applied on the printing surface. This is a convenient method. After a final color printing, a six-color gravure printing machine is used to apply a gloss coater. Agent. The formula of the polish is as follows:

Polishing Formulation 1: Peroxyethylene Polishing Polishing Formulation 2: Two-Component Polyurethane Polishing Agent

Polishing Agent Formula 3: Acrylate UV Curing Luster

Polishing Agent Formulation 4: Silicone Polishing Agent The above ratio is formulated with 5% or 10% of a solution of 5% to 10% of toluene or absolute ethanol as a solvent for coating on a concave eye coating roll or reverse roll coating, and then the reaction is heated. Dry curing.

(b) Dry composite coating method

(III) Extrusion coating glazing method


Author: Zhou Xiangxing