The Coating Film To Meet The Requirements Of Food Packaging
Traditional composite processing can produce two or more films of both the performance of multi-functional composite film.
However, the object must be a composite film processing, and PVDC, PVA and other functional materials should not be made into film (process, high costs, technical difficulties), and only very thin thickness of the packaging functions can meet the needs of (Tu thickness 1 – 3 microns).
So then the paint film to form on the base coating, a system of high barrier food packaging PVDC coated film required (K film: KOP, KPET, K nylon, KPE) and PVA barrier coating film (A film: AOP , APET, A nylon, APE, ACPP).
Food Packaging Need Good Oxygen Barrier Properties
Bacterial growth and reproduction, is the main reason for food spoilage, and the presence or absence of oxygen and the concentration level of bacterial survival and reproduction of the necessary conditions (except for anaerobic bacteria), which requires the use of packaging materials must be excellent oxygen barrier capabilities.
Food oils, oxidation of fat protein and other ingredients, food is a major cause of spoilage and deterioration.
It requires use of packaging materials must also have excellent oxygen barrier capabilities.
Food Packaging Needs Good Moisture Barrier Properties
Many foods need to be stored in a dry state, does not allow moisture to enter the outside packaging.
Because the water vapor to enter, will soften the food moisture, affect the taste, and it helps to accelerate the propagation of bacteria and food spoilage.
There are many foods need to food in the water control in a certain range, so that you can in a long time to maintain the original flavor of food. Thus, in many places and require packaging materials must have good water vapor barrier performance.
Food Packaging Needed To Keep The Food Authentic
To prevent external odor fleeing into the food, the same time to prevent the volatile flavor of food itself, to ensure the authentic food, packaging materials need to have excellent barrier ability flavor.
UV Barrier Food Packaging Needs
Some products also need to block UV light. Such as oil in the light will produce acid, resulting in product deterioration, damage to flavor.
Sunlight also can change color prints and merchandise. In addition, sunlight can promote fat oxidation. Alkaloid drugs, vitamins B1, B2, vitamin C, etc., but also because the role of light and oxygen react quickly, discoloration, and decreased other changes.
So here they require packaging materials can be made with UV blocking function.