Laser holographic printing, namely laser rainbow holographic printing, is a kind of high-tech printing process using optical technology.It can not only reproduce the main body of the original image, but also can along with the change of observation view azimuth, show the side of the original different shapes, laser holographic image by using the principle of white light diffraction grating, make the image effect varied, colorful and gorgeous, color, level clear, vivid, information and technology content high, the production of laser holographic images and replication technology content high, need professional talent, the processing technology is complex, expensive equipment, the image itself has the characteristics of difficult to imitation, therefore, it began in the 1980 s and is widely used in security field.At present, with the introduction of high technology such as encryption holography, three-dimensional holography and true color holography, as well as the popularization and application of two kinds of anodized aluminum film molded holograms, the anti-counterfeiting strength of laser holographic materials has been enhanced.
The most common laser holographic films are polyester film (PET), polypropylene film (OPP), polyvinyl chloride film (PVC) and water-washed film.
In addition to laser holographic films, there are currently other laser holographic materials.
1. Laser holographic paper. It can be divided into two types: film stickers and pure paper. The film sticker is made by laminating different types of paper with laser holographic PET or OPP film. The laminated cardboard not only has better stiffness, is not easy to tear, and the film surface is waterproof.
2. Laser holographic hot stamping. Laser holographic hot stamping foil is a holographic laser processing of thin foil with hot stamping function to form two-dimensional, three-dimensional, dot matrix, spiral, and synthetic holographic images. It has high gloss, colorful and variable colors, and overcomes ordinary Hot stamping technology has defects such as monotonous form, low quality, and lack of anti-counterfeiting effect.
3. Laser holographic cold foil foil. It uses printing and pressing technology to transfer the laser holographic foil to the substrate. It breaks the traditional hot stamping process of transferring gold foil by hot pressing, and uses a new technology-cold pressing technology to transfer gold foil, which not only solves the difficult process problems in hot stamping printing, but also avoids making metal stamps. The pollution caused to the environment during the printing process can also save a lot of energy.
4. Laser holographic aluminum foil. The laser holographic image is printed on the ordinary aluminum foil, thereby improving the anti-counterfeiting function and appearance effect of the packaged product. It has good processing adaptability and other characteristics in packaging, which is very suitable for mechanized production.
