Characteristics and R&D of environmentally-friendly functional materials (2)

It is well-known that kraft paper will cause a great deal of pollution to the environment during its use, and it will be difficult to recycle it after it is mixed with non-homogeneous products. . At present, yellow imitation paper (synthetic paper) is used instead of kraft paper. Because the synthetic kraft paper (imitation paper film) and the woven bag are made of the same material (both are PP materials), they can be easily recycled and reused, and they have good environmental performance. . The woven bag made by this method not only looks elegant and upscale, but also has a strong visual effect, improves the grade of the product, can bring more profits to the merchant, and has a good shading effect. At the same time, the synthetic kraft paper is waterproof, insect-proof, and reinforced. The effect has strengthened the ordinary function of the traditional woven bag.

With the development of industry and the need for consumption, people hope that the future food industry products, especially health foods, will have a longer shelf life. This requires the development of composite packaging in terms of serialization, multi-functionality, high performance, and special functions.

deodorant Packaging Due to the development of supermarkets and fast-food restaurants, in recent years, a new concept of HMR emerged and became popular in foreign countries, and the HMR market developed rapidly. In order to prevent the effects of odors (refer to odors and odors) on packaging items, deodorant packaging was developed. Now there are more than 40 kinds of deodorant packaging materials, mainly divided into three types: A type of chemical deodorant type, can remove nitrogen compounds and sulfur compounds plus ammonia, dimethylamine, trimethylamine, hydrogen sulfide and other odors Or smell. Class B is a physical type and is mainly used to remove odors or odors such as hydrogen sulfide and carboxylic acids. It is characterized by a good deodorization effect on high concentrations of hydrogen sulfide. Class C materials are mixed deodorant types. Mainly made of activated carbon deodorant, low concentration of good deodorant power is the characteristics of such materials Deodorant wrap film for food packaging can also play a role in deodorant preservation. General deodorant packaging is mainly used for those foods with special odors or odors, as well as packaging for agricultural products and aquatic products.

Antimicrobial packaging The problem of food spoilage caused by microorganisms has made antibacterial packaging a hot topic. To this end, Japan added a new type of inorganic antibacterial agent to packaging materials and developed a series of successful antibacterial packaging materials, which have antibacterial effects on various pathogenic bacteria. The main characteristics of the packaging material are as follows: The antibacterial effect lasts for a long time; because the antibacterial agent is a gas phase type, it has no adverse effect on the contents of the package; the stability is good.

In the packaging process, it has high thermal stability, stable concentration, and no adverse effects on the operating environment. Antibacterial packaging materials mainly include sheet, absorbent sheet, packaging film, and antibacterial packaging resin. Water-absorbent sheet is made of superabsorbent resin and usually has sheet type and coating type. Currently widely used is the antibacterial packaging film, made by adding antibacterial agents to the polyolefin film, and has antibacterial effects on most common microorganisms such as coliform bacteria, Staphylococcus aureus, Phytophthora boehmeriae, Borreiella aureus, and Aspergillus niger.

High-barrier packaging As we all know, the performance of aluminum-plastic composite packaging materials is superior, but it is opaque. For this reason, experts have successfully developed a class of high-barrier new materials. Its good barrier properties, other properties equal to or better than aluminum plastic composite materials. This kind of composite packaging material called GT is made by depositing a film of inorganic material (such as nano-silicon oxide or titanium oxide) with a thickness of 10 to 100 μm on the surface of the plastic film. This kind of nano coating has stable performance. Even after high temperature sterilization, its gas barrier property, moisture resistance and transparency are still as it was.

Packaging machine for sealing low temperature simple, energy saving, increased speed, to increase efficiency, to meet the needs of modern high volume package, thus sealing the packaging material using a low temperature is necessary for low temperature sealing of the package. The so-called low-temperature packaging material is a layer of low-temperature cold-sealed coating that is coated with natural rubber as the main component on the surface of the film, and does not need any heat to seal the packaging material. It has a series of characteristics: First, it has no thermal impact on the contents of the package, so it is particularly suitable for the packaging of heat-repellent products; second, it can use hard-sealable substrates; third, it can simplify the packaging machinery, reduce costs and save energy. The fourth is to achieve high-speed packaging; Fifth, the seal is good cold resistance, even at -20 °C seal strength does not decrease.

The requirements for flexible packaging for high-speed sealing packaging are mainly fashionable and low-priced. For example, the packaging of products such as chocolate, due to the influence of heat, requires a low packaging temperature and a beautiful seal. For this reason, high-speed sealing packaging materials have been developed. This is a packaging material coated with high-speed heat-sealable HSS and capable of high-speed sealing at low temperatures. It is superior to other materials such as EVA, acrylics, heat-sealing varnishes, trace waxes, etc., and therefore can be used for packaging of products that strictly limit the influence of odors or odors. Its characteristics are fast sealing speed, suitable for high-speed machinery. HSS can not only be coated on the surface of paper and aluminum foil, but also coated on the surface of various plastic films such as PP, KOP, PET, PVC, PE, etc. Generally, the thickness of HSS coating is about a few microns to meet the requirements.


(to be continued)