In recent years, cat-eye laser patterns have appeared on the color box packaging of toothpaste, wine and cosmetics, which not only brings a finishing touch to the product, but also gives an abstract beauty. The cat's eye laser pattern is realized by the cat's eye laser process. The author explored the process a few years ago and now summarizes some experiences and is willing to share it with the industry.
To achieve a cat's eye laser effect on a color box package, it is usually necessary to make cat eye laser paper. The mass production process of cat-eye laser paper is: making laser molding plate → mechanical molding laser film → vacuum spraying → laser film → paper → positioning and cutting sheet.
1. Making laser molded version
The laser molded version is specially made of special metal foil. Because the pattern surface is mainly electroplated with metal nickel, it is also called nickel plate in the industry.
At present, the laser engraving technology is commonly used to complete the engraving of graphic information on the nickel plate. A high-energy laser beam is generated by a laser generator, and the nickel plate is locally irradiated by a pattern of left and right array engraving or vector contour cutting, so that the surface is instantaneously melted or even vaporized, and the substance on the surface of the nickel plate is chemically and physically generated. Changes show signs, and the desired text, symbols and patterns are formed according to pre-design requirements. The laser beam is focused from millimeters to micrometers. The heat affected zone is small and the processing is fine, which can not be achieved by some conventional methods. At the same time, the process of laser laser engraving is automatically controlled by the computer. The engraving information is only related to the design content. As long as the computer engraving system can recognize the design artwork, the information can be accurately restored on the surface of the nickel plate to complete the engraving of the laser pattern.
Considering the processing steps of positioning, flattening and printing overprinting, the cross-cutting line must be complete when engraving the nickel plate. The mouth and pull gauge are designed with stepped arrow and cutting line. At the same time, the positioning electric eye needs to be engraved. A recognizable cursor (usually a disc with a matte effect). The engraved nickel plate is placed under a magnifying glass and the layout must not have any defects.
The nickel plate should be very careful during use. No minor collisions can occur during the maintenance of the plate. The surface should not be splashed with oil or water. Otherwise, it can only be scrapped.
2. Mechanically molded laser film
The laser film generally selects two materials of OPP and PET film as the substrate. The mechanically molded laser film directly presses the laser embossed plate onto the glued film substrate at a high temperature to form a light refraction point of varying heights and sizes.
The laser molding machine is mainly composed of a coating glue unit and a UV molding unit. The coating glue is the first process and is generally applied by a gravure process. The thickness of the rubberized layer directly affects the depth of field effect of the cat's eye. The thicker the rubberized layer, the stronger the depth of the cat's eye laser pattern. The thickness of the glue layer is determined by the product design, generally between 0.15 and 0.30 mm. Subsequently, a UV molding process is carried out, and under the irradiation of UV light of different wavelengths, the surface of the laser film exhibits a pre-designed pattern. It should be noted that the mechanically molded laser film needs to control the combination of the amount of glue applied and the molding speed. The general molding speed is 30 to 50 m/min.
3. Vacuum plating
After the molded laser pattern is completed, in order to achieve the metal effect, a metal foil is sprayed on the prepared laser pattern. The process is realized by a vacuum aluminum plating machine, and different wires are atomized in a vacuum container by a strong current, and the spray coating is applied on the pressed laser film to complete aluminum plating, chrome plating, nickel plating, copper plating, iron plating, etc. . Depending on the metal material, it is possible to produce a matte finish and a glossy mirror. Which vacuum coating effect is used should be selected according to the design requirements. If you only need to maintain a transparent laser effect, you can use zinc-plated zinc to protect the pattern.
4. Laser film crepe paper
The cat's eye laser film crepe process is carried out by a traditional laminating machine. The process should select the appropriate glue to control the speed and pressure of the crepe paper, so that the product is smooth, free of bubbles and wrinkles, and meets the printing requirements.
5. Cut the sheet
The cat's eye laser paper is rolled into a roll, and the flattening is carried out in two steps. In the first step, the splitting knives on the winder are adjusted, and the tracking electric eye traces the straight-line identification color mark on the laser film, and the straight line is cut by the left and right sides; the second step is to use the flat The slitting machine cuts the cat's eye laser paper of the good volume.
It should be noted that since the identification color code on the laser paper is a translucent frosted color mark formed by molding, it is somewhat different from the printing color code. Therefore, the laser paper cutting electromechanical eye must use an identifier that can recognize such an identification color mark, as long as the conventional cutting electromechanical eye is replaced or modified. At the same time, the positioning criteria should ensure accurate overprinting of the subsequent processes.
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