Brief introduction of the current situation of las

Brief introduction of the current situation of laser holographic packaging anti-counterfeiting (II)

transparent laser holographic image anti-counterfeiting technology

ordinary laser holographic images are generally made of aluminized polyester film through molding (or polyester film can be molded first and then aluminized). The function of aluminizing is to increase the intensity of reflected light and make the reproduced image brighter. The illumination light and observation direction are on the side of the observer, so the laser rainbow molded hologram is opaque. The transparent laser hologram actually cancels the aluminum coating and directly molds the hologram on the transparent polyester film. Jinan new era Gold Testing Instrument Co., Ltd., a manufacturer of Jinan experimental machine, was applied by the Ministry of public security to the resident ID card in 1996. The ID card was covered with a transparent film as a whole. When observing the front of the ID card under light, you can not only see the contents of the document, but also see the two-dimensional and three-dimensional rainbow holograms ("Great Wall" and "China" in Chinese and English) displayed on the transparent film

anti counterfeiting technology of reflected laser holographic image:

the principle of reflected laser holographic image imaging is to shoot the incident laser onto the transparent holographic emulsion medium, one part of the light is used as the reference light, the other part illuminates the object through the medium, and then the object scatters back to the medium as the object light. The object light and the reference light interfere with each other, and a multi-layer interference fringe surface is generated inside the medium, After the processing of the medium negative, a multi-layer translucent reflecting surface is generated inside the medium (for example, there can be more than 20 reflecting surfaces in the 6 micron thick latex layer), and the hologram is illuminated with a white light point light source. The multi-layer translucent reflecting surface generated inside the medium reflects the light back, and the virtual image of the original object can be seen against the reflected light, so it is called a reflected laser hologram

third generation encrypted holographic image anti-counterfeiting technology

encrypted holographic image refers to the invisible or speckled encrypted image obtained by encrypting the anti-counterfeiting image using optical image coding encryption technologies such as random phase coding encryption, moire coding encryption, laser speckle encryption and so on. Among them, the image encrypted by random phase encoding is invisible. Only by using a special photoelectric decoder can the original image be displayed by developing building energy-saving products and technologies that do not compete with energy resources. At present, it is mainly used for anti-counterfeiting of various cards. The original image can be displayed only when the image encrypted by Mohr code and laser speckle is superimposed with the decoded grating or decoded speckle, which can be used for the anti-counterfeiting of general goods

the encrypted hologram has certain anti-counterfeiting function because it is invisible or only shows a piece of noise, and it is difficult to decipher without a key

fourth generation BOPP laser holographic anti-counterfeiting shrink film packaging anti-counterfeiting technology

BOPP laser holographic anti-counterfeiting shrink film packaging anti-counterfeiting technology is a new anti-counterfeiting technology developed by integrating the first three laser technologies. Because this technology has special requirements for BOPP shrink film substrate, the purchase and development of BOPP production equipment is expensive, which blocks the possibility and feasibility of counterfeiters' counterfeiting at the source. The laser holographic anti-counterfeiting shrink film is the first to adopt the combination of wide holographic transparent molding technology and encrypted holographic image anti-counterfeiting technology in the production, and skillfully solves the contradiction between hot pressing and substrate heat shrinkage; In use, heat seal is provided on the two surfaces of BOPP anti-counterfeiting shrink film to wrap the package as a whole; When unpacking, the BOPP anti-counterfeiting film must be torn first, which destroys the integrity of the original anti-counterfeiting film. This anti-counterfeiting means is highly appraised by the professional committee of laser holographic technology of China anti counterfeiting industry association because of its complex technology, high anti-counterfeiting strength, fine workmanship and exquisite appearance

the anti-counterfeiting effect of BOPP laser holographic anti-counterfeiting shrink film is much stronger than that of laser holographic anti-counterfeiting logo, and its anti-counterfeiting life is much longer than that of laser holographic anti-counterfeiting logo. Because the laser holographic image anti-counterfeiting logo is printed by the printing factory, it cannot be ensured that the master plate will not flow out of the printing process or be copied illegally. At the same time, for counterfeiters, the laser holographic logo can be purchased directly, without equipment investment or mastering the technology. The high price of BOPP production line and the complex processing technology of heat sealing heat shrinkable film, coupled with transparent holographic anti-counterfeiting images and secret miniature passwords, make it extremely difficult for scattered small and medium-sized factories to make counterfeits

laser holographic anti-counterfeiting technology is a modern laser application technology achievement that has received widespread attention at home and abroad in recent years. It is favored by consumers with its complex holographic imaging principle and colorful flash effect, and fills the gaps between the experimental machine and the ground. Compared with general printed trademarks, laser holographic image anti-counterfeiting marks have unique advantages and charm, and can be widely used in the anti-counterfeiting of trademarks, securities, confidential cards and luxury handicrafts in light industry, medicine, food, cosmetics, electronic industries. However, there are many domestic manufacturers and their management is extremely chaotic, which greatly affects the laser hologram. 1. The electronic tensile testing machine is divided into: tensile test, pressure test, zigzag test, shear test, 90 peel test, 180 peel test, deflection test, change test, fatigue test, tear test, stiffness test, ring stiffness test, static stiffness test, technological test, bursting test, puncture test Cycle experiment, safety experiment, endurance experiment, high temperature experiment, low temperature experiment, high and low temperature experiment, protective experiment, restrictive experiment, impact experiment, ball drop experiment, hardness experiment, bonding strength experiment, bolt tension experiment, bonding force tension experiment, sealing strength experiment, gluing strength experiment, etc; The credibility of anti-counterfeiting signs in people's hearts. The BOPP laser holographic anti-counterfeiting shrink film, which starts from the substrate, will replace it and make due contributions to the development of transparent anti-counterfeiting technology at home and abroad

information source: Printing Technology