Screen printing technology in White Paper Gift Boxes packaging printing

Screen printing technology in White Paper Gift Boxes packaging printing

Web-fed rotary screen printing uses a nickel metal round screen printing plate, a built-in squeegee, and an automatic inking system that transfers the printing ink from the round screen to the surface of the substrate supported by the impression cylinder. The entire printing process from paper feeding, ink supply, printing color registration, UV drying, etc. are fully controlled by computer. The circular screen printing plate is made of 100 percent nickel non-woven material, and its mesh is hexagonal wire-shaped by electroforming. It is suitable for large format rotary printing, the maximum speed can reach 125m/min, and the screen can be reused 15 times. Therefore, web-fed rotary screen printing can not only meet the requirements of printing matte, ice flowers and other special effects, but also online hot stamping holographic anti-counterfeiting signs, embossing, die-cutting, and easy to achieve high-speed automatic printing of cartons.

Environmentally friendly UV screen printing imitation metal etching ink is mainly composed of oligomer (ie photocurable resin), reactive diluent (ie photosensitive crosslinking monomer), photo (polymerization) initiator and filler. Printed on gold and silver cardboard, the UV silk-screen imitation metal etching ink is rapidly cured under the irradiation of ultraviolet light, and the surface of the printed matter has a frosted effect.

Screen printing has the characteristics of thick ink layer, rich graphics and text, strong three-dimensional sense, and wide range of printing materials. Its application in high-end tobacco, alcohol, and food packaging cartons is gradually increasing. Using UV screen ink to print frosted, refraction, ice, wrinkles and other effects on the cigarette case has greatly stimulated consumers' desire to buy. However, due to the low printing speed of the flat screen printing method, the slow ink curing speed, the difficulty in controlling the printing quality, and the large consumption of printing materials, it cannot meet the needs of the scale and mass production of cigarette cartons. The high-speed rotary screen printing production line is adopted, which has fast printing speed, high production rate, undisturbed quality of printed products and low consumption. Mass production of beautiful folding cartons.

Under the irradiation of ultraviolet light, the photopolymerization initiator in the UV ink absorbs photons of a certain wavelength and is excited to an excited state to form free radicals or ions. Then, through the transfer of intermolecular energy, polymers such as polymerizable prepolymers and photosensitive monomers become excited states, resulting in charge transfer complexes; the complexes are continuously cross-linked and cured to form films. UV ink selectively absorbs photons of ultraviolet light, and the drying of UV ink is affected by the total energy of the radiated light of the UV light source and the distribution of light energy at different wavelengths. Solving the matching of UV ink and UV light source is conducive to speeding up the drying speed of ink, improving labor productivity and energy utilization, and reducing production costs.

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