1. General packaging film
The commonly used food packaging films currently include PVA coated barrier film, biaxially oriented polypropylene film (BOPP), biaxially oriented polyester film (BOPET), nylon film (PA), cast polypropylene film (CPP), aluminum plated film, etc. These films are widely used due to their excellent performance, good transparency, high tensile strength, certain gas and water resistance, and low production cost.
2. Edible packaging film
Edible packaging film refers to a thin film formed by blending edible materials, mainly natural macromolecules such as lipids, proteins, and polysaccharides, with edible plasticizers, crosslinking agents, etc., through physical interactions and different processing techniques. According to the characteristics of the main raw materials used, edible films can be divided into four categories: sugar edible films, protein edible films, lipid edible films, and composite edible films. For edible functional films, they have been widely used in daily life, such as glutinous rice paper used in candy packaging and corn baking packaging cups for ice cream, which are typical edible packaging. Compared with synthetic packaging materials, edible films can be biodegraded without any pollution. With the increasing awareness of environmental protection among people, edible films have quickly become a research hotspot in the field of food packaging and have achieved certain results.
3. Antibacterial food packaging film
Antibacterial food packaging film is a type of functional film that has the ability to inhibit or kill surface bacteria. According to the form of antibacterial, it can be divided into two types: direct antibacterial and indirect antibacterial. Direct antibacterial is achieved through direct contact between packaging materials containing antibacterial ingredients and food; Indirect antibacterial mainly involves adding substances that can regulate the microenvironment inside the packaging to the carrier, or using the selective permeability of packaging materials to control microbial growth, such as modified atmosphere packaging film.
4. Nano composite packaging film
Nanocomposite thin film refers to a composite thin film material formed by embedding components with dimensions on the order of nanometers (1-100nm) into different matrices, which has the advantages of both traditional composite materials and modern nanomaterials. Due to the surface effect, volume effect, size effect and other characteristics caused by the special structure of nanocomposite films, their optical properties, mechanical properties, antibacterial properties, barrier properties and other aspects exhibit characteristics that conventional materials do not possess, making them widely used in food packaging. They can not only meet the requirements of extending the shelf life of food, but also monitor the quality changes of food inside the packaging.
5. Degradable packaging film
This type of film mainly solves the problems of difficult recycling of certain non degradable packaging materials, soil structure damage when buried underground, and air pollution caused by toxic gases generated during incineration treatment. According to the degradation mechanism, it is mainly divided into photo degradable packaging film and biodegradable packaging film.
Degradable films, which meet environmental requirements, are widely studied and have received attention from researchers. Many new types of biodegradable and environmentally friendly materials have been developed, such as polylactic acid (PLA) made from renewable plant resources (such as corn) and starch raw materials, environmentally friendly plastic polypropylene carbonate (PPC) synthesized from carbon dioxide and epichlorohydrin, and chitosan obtained by deacetylation of chitin widely present in nature. These material properties have decreased; The optical performance, transparency, and surface glossiness are also partially biodegradable, which not only meets the high transparency requirements of packaging films, but also plays a positive role in improving the environment and has great application prospects.
However, it is worth mentioning that food packaging film has stricter requirements for the hygiene and safety of packaging materials, requiring corresponding standards and testing procedures. Although some measures have been taken domestically and internationally, there are still many shortcomings. Recently, foreign countries have developed the use of plasma surface treatment technology to vapor coat inorganic oxide coatings such as SiOx and AlOx on substrates such as PET and BOPP, resulting in high barrier packaging films. Silicon coating film has relative stability to temperature and is suitable for packaging high-temperature steamed and sterilized food. Degradable films, edible films, and water-soluble films are all green packaging products developed by countries around the world in recent years. Research on using natural macromolecular polymers such as lipids, proteins, and sugars as packaging films has also flourished.
Post time: Aug-07-2025