The biggest feature of nanopaper is the addition of modified nanopowder for printing or packaging, that is, it already has the corresponding nano-functions when paper is formed. Nano-paper is the best technology and the lowest cost technology in corrugated box packaging technology, and its application prospects are quite optimistic.
(a) The use of superhydrophobic nanostructures and coating technology has improved the paper hydrophobicity and surface strength. The technology is simple, super-hydrophobic nano-structure coating technology and application Technology & Application technology and its application in paper products is a domestic initiative. In addition to protecting the original writing and copying functions of the paper, the nanopaper also has special properties such as super-hydrophobic and moisture-proof properties that are not provided by plain paper, and improves the strength of the printing surface and reduces the rate of expansion and contraction. Not only is it not wet when poured onto water. It will also allow water to roll freely on paper like lotus leaf. The added cost is only about 10% of the cost of plain paper, so this nanopaper has a good market potential.
(II) The binary synergistic nano-interface material is to promote the binary synergistic promotion to the nano-interface, discuss the new interface physical properties, and super-dual interface physical properties (or super-parent nano-materials). The basic principle is to build the interface structure with complementary nano-sized geometries (such as convex and concave phases) on a specific surface. The low-convex surface can make the adsorbed gas atoms and molecules stably exist and has a stable layer on the macroscopic surface. The gas film, so that oil or water can not be in direct contact with the surface of the material, so that the surface of the material exhibits extraordinary double sparse. At this time, the contact angle between the droplet or oil droplet and the interface tends to be maximum. In the area of packaging materials, paper products, cardboard, cartons, films, etc., have all achieved surprisingly super-hydrophobic and super-oleophobic effects.
(III) Functional Nano Cardboard
1. Antibacterial, deodorant
In the production of natural pulp, sterile gas is injected. This paper has the function of preventing the intrusion of bacteria and can be used for the packaging of medical instruments. The newly developed nano-composite functional paper can effectively solve the problem of discoloration of silver-based antibacterial agents. It is non-toxic, low-cost, and has good antibacterial effects on most common microorganisms such as Escherichia coli, Staphylococcus aureus, and Aspergillus niger. Nanoparticles can also be added to paper, plastic, cartons and composites for packaging foods, which can extend the shelf life of packaged foods.
Paper made of a porous inorganic substance and organic flavonol can absorb abnormal odors such as ammonia. Anatase titanium dioxide with a thickness of about 30 mm has an extremely strong antibacterial and deodorizing function, so the paper produced therefrom has a deodorant function.
2. Moisture proof
Dip-coated paper can improve the moisture-proof performance, and can be used to make rainproof bags and bag-proof bags for fruit tree nursery. Such as incorporation of nano far infrared powder, this powder using high-quality natural minerals as raw materials, processed by a special nano-powder preparation process of functional ultrafine powder. When it absorbs the heat from outside, it can release far-infrared rays with a wavelength of 4 microns to 14 microns. It has a special far-infrared radiation function, harmless to the human body, and has the obvious effect of keeping warm and dehumidifying.
3. Heat and fire resistant
The paper made of specially treated pulp has good heat resistance and water vapor absorption properties and can be used as a microwave food packaging box. Such as the incorporation of nano-UV powder, the powder itself is non-toxic and harmless, can shield, absorb ultraviolet rays, with obvious anti-ultraviolet radiation capacity. Incorporating the finished paperboard can withstand high temperatures.
Paper made from the mixing of aluminum hydroxide and natural pulp or mixed with phosphorized pulp and glass fiber has good heat and flame resistance. Such as the addition of nano-light conductive powder made of cardboard, with fire-resistant, high temperature performance.
4. Acid and oil resistant
The paper made of a mixture of special pulp and additives has excellent light-shielding and acid resistance. If the inorganic inorganic antibacterial powder is injected into the pulp, it can be permanently combined with the polymer substrate, and the paper made by mixing this powder has the functions of acid resistance and alkali resistance.
The inner layer of the board is treated with oil-resistance to prevent the oil from penetrating. The surface of the board can be printed with a general paint treatment. The board is mainly used for the packaging of oily equipment.
5. Antisepsis, anti-mildew
Papers made of cristobalite and activated carbon can be used to make corrugated cartons for the transport of flowers, which can absorb hydrogen sulfide that causes spoilage of flowers. Incorporating nano-sized titanium dioxide powder (this is a white powder, crystal is divided into anatase and rutile) cardboard, paper, can play a role in anti-corrosion, anti-mildew. Because the main function of anatase crystals is antibacterial, antiseptic, and mildewproof; the main function of rutile crystals is to enhance, toughen, and degrade organic contaminants.
(four) functional cardboard plate
1. Aroma packaging
Mecormick Company of the United States introduced a new type of aroma packaging material, which is a non-aluminum foil Perfrma cardboard, containing a special coating, can maintain the aroma for 3 years, and has an anti-ultraviolet radiation function and is used as a packaging sheet material.
2. Measurable germ packaging material
Canada's Tox-inalert company developed a new packaging material that can detect bacteria. Using a protein-based antibody test system, four pathogens, Salmonella, Campylobacter, Escherichia coli 0157 and Listeria can be detected. The color change reaction occurs when the package comes into contact with contaminated food. The package material can be processed into any shape, suitable for different product needs. 80% of the composition of the polymer film, the other is metal foil and cardboard plate.
Functional corrugated paperboard and corrugated carton are the special packaging of technical innovation by the combination of modern science and technology and packaging engineering. It fully reflects the development direction of modern packaging technology. The key technology of functional corrugated paperboard and corrugated carton is traditional. Carton and corrugated cardboard are modified and the functional design and innovation of the traditional corrugated box structure.
Source: Packaging World
