[China Packaging Network News] Greening and Standardization of Food Packaging Membrane Development Green packaging refers to the harmlessness of ecological environment and human health throughout the product life cycle, which can be recycled or easily degraded in nature, and is suitable for sustainable development. package. As a part of packaging materials, food packaging film, the trend of green is inevitable.
Since the food packaging film has the excellent performance of effectively protecting the food safety, and its high transparency can effectively beautify the packaging, the position of the food packaging film in the commodity packaging becomes more and more important. In order to meet the ever-changing external environment and the needs of different consumers, many companies at home and abroad have stepped up efforts to develop food packaging films. First we look at the classification:
1. General packaging film
Currently used food packaging films mainly include: PVA coating bureau barrier film, biaxially oriented polypropylene film (BOPP), biaxially oriented polyester film (BOPET), nylon film (PA), cast polypropylene film (CPP) , aluminum film and so on. Because of their excellent performance, good transparency, high tensile strength, and certain gas barrier and water blocking properties, these films have a wide range of applications.
2. Antibacterial food packaging film
Antibacterial food packaging films are a class of functional films that have the ability to inhibit or kill surface bacteria. According to the antibacterial form, it can be divided into two kinds: direct antibacterial and indirect antibacterial. Direct antibacterial is achieved through direct contact with packaging materials containing antibacterial ingredients and food to achieve antibacterial, and indirect antibacterial, mainly in the carrier to add some substances that can adjust the microenvironment within the package, or use the selective permeability of packaging materials to control microorganisms Growth, such as modified atmosphere packaging film.
3. Edible packaging film
Edible packaging film refers to edible macromolecules such as edible materials, mainly lipids, proteins, polysaccharides, etc., and the addition of edible plasticizers, cross-linking agents, etc., through physical interaction, through different processing technologies. The formed film. According to the characteristics of the main raw materials used, the edible films can be divided into four categories: edible edible films, edible edible films, edible edible films, and edible edible films. For edible functional film, it has been widely used in daily life. For example, glutinous rice paper used in candy packaging and corn baking packaging cups for packaging ice cream are all typical edible packaging. Compared to synthetic packaging materials, edible films can be biodegraded without any contamination. As people's awareness of environmental protection has increased, edible films have rapidly become a research hotspot in the field of food packaging, and have achieved certain results.
4, degradable packaging film
This kind of film mainly solves the problem that it is difficult to recover certain non-degradable packaging materials. Buried underground will destroy the soil structure, and the incineration will cause toxic gas to cause air pollution. According to the degradation mechanism, it is mainly divided into photodegradable packaging film and biodegradable packaging film.
Degradable membranes have been studied extensively because they meet environmental protection requirements. They have received the attention of various researchers and have developed many new types of biodegradable and environmentally-friendly materials, such as those made from starch raw materials proposed by renewable plant resources (such as corn). Lactic acid (PLA), an environmentally friendly plastic polypropylene carbonate (PPC) synthesized from carbon dioxide and propylene oxide, and chitosan derived from the deacetylation of chitin, which is widely found in nature . These material properties are reduced; optical properties, transparency, and surface glossiness are also not completely degradable, not only satisfy the high transparency of the packaging film, but also play an active role in improving the environment, and have great application prospects.
5. Nano composite packaging film
Nano-composite film refers to a composite film material formed by inserting elements with a dimension dimension of nanometer order (1-100 nm) in different substrates, and has the advantages of both conventional composite materials and modern nano-materials. Due to the special surface structure, volume effect and size effect of nanocomposite films, their optical properties, mechanical properties, antibacterial properties, barrier properties, etc., exhibit characteristics that are not available in conventional materials, making them in foods. There is a wide range of applications in packaging that can not only meet the requirements for extending the shelf life of foods, but also monitor the quality changes of foods in the packaging.
At the same time, food packaging films have stricter requirements on the health and safety of packaging materials. Corresponding relevant standards and testing procedures are required. Although some measures have been taken at home and abroad, there are still many deficiencies. In recent years, foreign countries have developed and developed the use of plasma surface treatment technology in the PET, BOPP and other substrates evaporated on SiOx, AlOx and other inorganic oxide coatings to obtain a high barrier packaging film. Silicon coating film has relatively stable temperature and is suitable for high temperature cooking and sterilization food packaging. Degradable membranes, edible membranes, and water-soluble membranes are all green packaging products developed by countries around the world in recent years. Research on the use of natural macromolecule polymers such as lipids, proteins, and carbohydrates as packaging films has also been booming.