Food packaging film on the packaging of health safety in the more stringent requirements, the need to have the relevant standards and testing processes, although some measures taken at home and abroad, but there are still many shortcomings. Recently, foreign research and development of the use of plasma surface treatment technology in PET, BOPP and other substrates deposited SiOxO, AlOx and other inorganic oxide coating, high barrier packaging film. Coated silicon film on the temperature there is a relative stability, suitable for high temperature cooking sterilization food packaging. Degradable film, edible film and water-soluble film are in recent years, the world's research and development of green packaging products, the use of lipids, proteins and sugars and other natural macromolecules as a packaging film research has also been booming.
As the food packaging film with excellent protection of food safety and excellent performance, while its high transparency can be an effective beautification of packaging, so food packaging film in the commodity packaging position is more and more important. In order to meet the current changes in the external environment and the needs of different consumers, many companies at home and abroad to increase the food packaging film research and development efforts. First we look at the classification:
1. General packaging film
Commonly used food packaging film mainly include: PVA coating barrier film, biaxially oriented polypropylene film, biaxially oriented polyester film, nylon film, cast polypropylene film, aluminum film. These films because of its excellent performance, good transparency, high tensile strength, with a certain gas barrier properties and low production costs, more widely used.
2. Antibacterial food packaging film
Antimicrobial food packaging film is a kind of functional membrane with the ability to inhibit or kill the surface bacteria. According to the form of antibacterial, can be divided into two kinds: direct antibacterial and indirect antibacterial. Direct antimicrobial antimicrobial composition of the packaging material through direct contact with the food to achieve antibacterial; and indirect antibacterial, mainly in the carrier to add some can adjust the packaging microenvironment of the material, or the use of packaging materials to select the permeability to control the microbial Growth, such as tone packaging film.
3. Edible packaging film
Edible packaging film, refers to the edible material, mainly lipid, protein and polysaccharides and other natural macromolecules, add edible plasticizers, crosslinking agents, etc., through the physical role of blending, through different processing technology And the formation of the film. According to its main raw material characteristics, edible film can be divided into four categories: carbohydrate edible film, protein edible film, lipids edible film, complex edible film. For edible functional film, it has been widely used in daily life, such as gluten rice paper used in confectionery packaging, corn baking packaging cups with ice cream, etc., are typical edible packaging. Compared with synthetic packaging materials, edible film can be biodegradable, without any pollution. With the increase of people's awareness of environmental protection, edible film in the field of food packaging quickly become a hot research, and achieved some results.
4, can be degraded packaging film
This film is mainly to solve some difficult to degradation of packaging materials difficult to recover, buried underground will damage the soil structure, incineration will produce toxic gases caused by air pollution problems. According to the mechanism of degradation, mainly divided into photodegradable packaging film and biodegradable packaging film.
Degradable films meet the requirements of environmental protection, the current research is more extensive, by the researchers attention, developed a lot of new types of biodegradable environmentally friendly materials, such as the use of renewable plant resources made of starch raw materials made of polylactic acid, carbon dioxide And propylene oxide as raw materials for the synthesis of an environmentally friendly plastic polycarbonate and is widely present in the natural chitin obtained by deacetylation of chitosan. The optical properties, transparency, surface gloss are also incompletely degradable, not only to meet the high transparency of the packaging film, but also to play a positive role in improving the environment, with great application prospects.
5. Nano-composite packaging film
Nanocomposite films are composite thin film materials formed by assembling different components of nanometer orders of magnitude in different matrices, and have the advantages of both traditional composite materials and modern nanomaterials. Because of its special structure caused by the surface effect, volume effect, size effect and other characteristics of their optical properties, mechanical properties, antibacterial properties, barrier properties and other aspects of conventional materials do not have the characteristics of its food Packaging has a wide range of applications, not only to meet the extended shelf life of food requirements, but also to monitor the quality of food within the packaging changes.
Food packaging film to green and standardized development Green packaging is the product throughout the life cycle of the ecological environment and human health harmless, can be recycled or easy to degrade in nature, in line with the sustainable development of moderate packaging. Food packaging film as part of the packaging material, green trend is inevitable.