There are many kinds of food packaging bags used for food packaging, and they have their own unique performance and characteristics. Today we will discuss some commonly used food packaging bag knowledge for your reference. So what is a food packaging bag? Food packaging bags generally refer to sheet plastics with a thickness of less than 0.25mm as films, and flexible packaging made of plastic films is widely used in the food industry. There are various kinds of food packaging bags. They are transparent, flexible, have good water resistance, moisture resistance and gas barrier properties, good mechanical strength, stable chemical properties, oil resistance, easy to finely print, and can be heat-sealed to make bags. Moreover, the commonly used food flexible packaging is usually composed of two or more layers of different films, which can be generally divided into outer layer, middle layer and inner layer according to the position.
What are the requirements for the performance of each layer of commonly used food flexible packaging films? First of all, the outer film is generally printable, scratch-resistant, and medium-resistant. Commonly used materials are OPA, PET, OPP, coated film, etc. The middle layer film generally has functions such as barrier, shading, and physical protection. Commonly used materials include BOPA, PVDC, EVOH, PVA, PEN, MXD6, VMPET, AL, etc. Then there is the inner layer film, which generally has the functions of barrier, sealing, and anti-media. The commonly used materials are CPP, PE, etc. In addition, some materials have the joint function of the outer layer and the middle layer. For example, BOPA can be used as the outer layer and the inner layer, and can also be used as the middle layer to play a certain barrier and physical protection.
Commonly used food flexible packaging film characteristics, generally speaking, the outer material should have scratch resistance, puncture resistance, UV resistance, light resistance, oil resistance, organic resistance, cold resistance, stress crack resistance, printable, heat stable, low odor, low A series of properties such as odor, non-toxicity, luster, transparency, shading, etc.; the intermediate layer material generally has impact resistance, compression resistance, puncture resistance, moisture resistance, gas resistance, fragrance retention, light resistance, oil resistance, organic resistance, heat resistance and cold resistance. , stress cracking resistance, double-sided composite strength, low odor, low odor, non-toxic, transparent, light-proof and other properties; then the inner layer material, in addition to some common properties with the outer layer and the middle layer, also has its own unique properties, must have Fragrance retention, low adsorption and impermeability. The current development of food packaging bags is as follows: 1. Food packaging bags made of environmentally friendly materials. 2. In order to reduce costs and save resources, food packaging bags are developing towards thinning. 3. Food packaging bags are developing towards special functionalization. High-barrier composite materials will continue to increase market capacity. High-barrier films with the advantages of simple processing, strong oxygen and water vapor barrier properties, and improved shelf life will be the mainstream of supermarket food flexible packaging in the future.
Post time: Jan-21-2022