Nanotechnology in Functional Carton Packaging

The existing fresh-keeping techniques and processes are very complicated, and the fresh-keeping packaging has poor results, and the relative cost is high during the packaging operation and storage and transportation. With nanotechnology, these problems will be solved.

The fresh-keeping packaging of fresh foods such as fruits and vegetables is to solve the problem of ethylene, a gaseous substance that accelerates deterioration of fruits and vegetables. In fresh-keeping packaging, fruits and vegetables release ethylene. When the concentration of ethylene reaches a certain concentration, the fruits and vegetables will accelerate rot. Therefore, ethylene absorbers should be added to the fresh-keeping packaging to reduce the ethylene content in the packaging to improve the preservation effect and extend the shelf life. . However, tests have shown that the effect of ethylene absorbents found so far is unsatisfactory, which has led to difficulties in the research of fresh-keeping packaging. Nano Ag powder can accelerate the oxidation of ethylene released from fruits and vegetables to reduce the ethylene content, so as to achieve a good effect of preservation. The nanoparticles used as oxidation catalysts mainly include Fe3O4, Fe2O3, CO3O4, NiO, and Pt, Rh, Ag, Pd, and the like.

A Japanese paper company produced a fresh fruit packaging box. It is to add a layer of polyethylene film on the corrugated liner of the corrugated carton, and then apply a layer of waterproof wax coating containing trace amounts of fruit disinfectant to prevent the fruit from evaporating and restrain the breath from reaching the purpose of preservation. Packing fruit in this kind of packaging keeps the fruit fresh within a month.

In order to keep fruits and vegetables fresh during transportation, a U.S. company has invented a new method for reducing the oxygen content and increasing the nitrogen content of containers to keep fruits and vegetables fresh. This method uses a new type of packing box with air-conditioning performance in transportation. This packing box has a special film that can absorb oxygen molecules and allow nitrogen to pass through. In this way, after the air enters the packing box through the film, the nitrogen content in the box can be as high as 98% or more, so that the respiration of fruits and vegetables can be slowed down, and the purpose of keeping freshness for a longer time can be achieved.

AegisNC is suitable for use in cardboard cartons for coated frozen food products. In the United States, nanometer water repellent is applied to the inner layer of the carton, and the beer can be placed in a carton with ice. The surface of the carton to which the water repellent is applied does not adhere to water, and is environmentally friendly and moisture-proof.

Nano-type security corrugated carton

Nanomaterials have superior sensitivity and have broad application prospects in terms of temperature sensitivity, gas sensitivity, moisture sensitivity, etc. The use and development of anti-counterfeit packaging on carton boxes will enable anti-counterfeiting packaging technology to enter a new stage. The sensitivity of the nanoparticles can be used to prepare temperature (heat) sensitive materials, gas sensitive materials, and moisture sensitive materials, respectively, and then used as anti-counterfeiting packaging for cartons.

The general metal particles are black and have the characteristics of absorbing infrared rays, and have large surface area, high surface activity and sensitivity to the surrounding environment (temperature, heat, light, humidity, etc.). Therefore, when the nano-particles with such characteristics are added to the packaging material, or made into a coating or a polishing agent, they are applied to the surface of the material for product packaging. When people choose a product, they can be identified by heat, fiber, or temperature to achieve anti-counterfeiting. In other words, the use of nanotechnology can achieve color anti-counterfeiting, physical and chemical effects of anti-counterfeiting and other purposes, so as to improve the level of anti-counterfeiting technology.

Nano biotechnology applied to carton anti-counterfeiting

As a biological macromolecule, DNA is the basis of biological genetic material. The core content of modern genetic engineering technology is the molecular manipulation or molecular cloning of DNA. At present, non-biological applications of DNA, such as biological computers, nanobiology, and DNA, are used for product anti-counterfeiting. However, as far as DNA is used for product anti-counterfeiting, LePage and Slater are pioneered (Lepage and Slater 1987). A DNA-based anti-counterfeiting method. The basic process is to add a piece of DNA with a length of 1 to 10 KB as a signal molecule to a specific commodity, and use the double-strand complementary property of DNA to obtain a probe DNA molecule, labeling the probe DNA molecule and signal DNA molecule based on isotope or non-isotopic labeling. The hybridization signal, which reveals the presence of signal molecules, and thus determines the authenticity of the product.

Depending on the ratio of 1:1 (10~20) and 1:(10~9), the cryptographic marker DAN is incorporated into water and low-alcohol (less than 40% alcohol content), and the lul liquid sample is taken directly. PCR detection can also be performed. Give correct results. Attempts are being made to add marker DNA during the production of packaging cartons to facilitate the security of cartons.