Laser holographic transfer paper is also called laser cardboard. It transfers all the traditional laser holographic characters and patterns that can only be recorded on the plastic film to the paper required for printing, and changes the original laser holographic carrier. Become a new source of anti-counterfeiting packaging materials. Laser holographic transfer paper technology is an internationally recognized anti-counterfeiting technology with development prospects. It is based on the anti-counterfeiting requirements of the paper packaging industry. High-tech products that combine multiple technologies. It is made into a transferable holographic plastic film, and then it is transferred to the paper surface, or it can be directly molded onto the paper to make a laser holographic transfer paper.
1) Laser holographic transfer paper production type
There are many classification methods for laser holographic transfer paper, which can be divided into direct method (direct pressure method) and transfer method (indirect method) according to the production process: according to whether the laser holographic paper is positioned, it can be divided into non-positioning holographic paper and positioning holographic paper: according to Whether transmission can be divided into transmission holographic paper and reflection holographic paper: according to the thickness of the paper can be divided into holographic cardboard and holographic thin paper.
2) The production principle of laser holographic transfer paper
â‘ Direct method: It is a method of directly applying laser holography on paper. This method is simple in production process, but it has limitations, and is generally limited to lighter weight paper.
Process characteristics:
· The process is simple and can be mass produced:
· The requirements for holographic embossed plates are relatively high. Because the embossing effect of paper is not very good, it can only be suitable for products with low holographic effect requirements:
· The paper has higher requirements, the paper must be coated paper with good flatness, otherwise it may make the hologram effect is not good or the aluminum plating is not strong or bright, and the water content of the paper is required to be controlled at 4% The following will affect the aluminum plating: But the paper after the aluminum plating has a low water content of about 3%, cannot be printed, and must be adjusted to adjust the moisture content to meet the printing requirements:
· The requirements for each coating are high, the base coat should have good leveling, and at the same time, it must have good adhesion to the paper and the molded layer: the molded layer should be firmly combined with the bottom layer and the aluminum layer. To have better moldability and aluminizability: the top coat is to protect and print ink, so it has better adhesion and wear resistance with the aluminum layer, and has better printability:
· The equipment requirements are high. The coating machine, aluminizing machine and molding machine should be designed and manufactured according to the characteristics of the paper, and the performance requirements in all aspects are relatively high.
â‘¡Transfer method: It is a method of making the laser hologram coated on the PET (or BOPP) film, and then through the compounding and peeling process to transfer the holographic layer to the paper required by the user. This method can be transferred to various thicknesses of paper with good brightness, but the process is relatively complicated.
Process characteristics:
· The requirements for holographic embossed plates are relatively low compared to direct methods:
· In addition to the requirement of better flatness for paper, other requirements are not high, but it takes about 2 days to cure after lamination :! The requirements for each coating are higher, the coating on BOPP and PET Not the same, the release layer and the molded layer on PET should have better adhesion, and at the same time, they must have better wear resistance and printability, and the molded layer, the release layer and the aluminum coating layer should have better The adhesion, but also have better moldability and aluminum plating:
· The requirements for equipment are not high. Since they are first made on the film, ordinary coating, molding, peeling, compounding and other equipment can be used:
The deformation of different films is different. For example, PET has no deformation and BOPP has deformation, and high-precision graphics cannot be transferred:! Complex process, long time, low production efficiency, film pollution environment, etc., cannot be mass-produced.
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