When PET shrink film is used for food packaging, what are the effects of it on food preservation, odor barrier and sanitation and safety, and what standards need to be met?
Publish Time: 2024-08-12
When PET shrink film is used for food packaging, it has many important functions.
In terms of preservation, PET shrink film can fit closely to the surface of food, forming a relatively sealed environment and reducing the entry of oxygen. This helps to delay the oxidation process of ingredients in food, such as preventing oxidation and discoloration of fruits and maintaining the freshness of oily foods. By limiting the contact between oxygen and food, the shelf life of food can be extended and its taste and nutrients can be maintained.
For odor barrier, PET shrink film can effectively block the emission of food's own odor and the invasion of external odor. For example, when packaging foods with strong odors such as cheese, it can prevent its odor from affecting the flavor of other foods around it, and also prevent the external bad odor from being absorbed by the food, ensuring that the original flavor of the food is not disturbed.
In terms of sanitation and safety, PET shrink film itself needs to meet strict standards. First of all, its materials must be non-toxic and odorless, and harmful substances cannot migrate into food. During the production process, the use of additives must be strictly controlled to ensure that these additives do not contaminate food. The surface of PET shrink film should be kept clean and no dust, bacteria or other contaminants should be attached. It also needs to have a certain moisture-proof performance to prevent the entry of moisture from causing food deterioration or breeding of microorganisms.
In terms of standards, it must comply with the relevant national food packaging material hygiene standards. For example, there are strict restrictions on the content of heavy metals and the residual amount of harmful substances. At the same time, in terms of physical properties, it must have sufficient strength and toughness to prevent rupture during transportation and storage, resulting in food exposure to the external environment. In addition, it is also necessary to meet requirements such as printability so that relevant information of food, such as ingredients, production date, shelf life, etc., can be marked on the film to provide consumers with accurate information. In short, PET shrink film provides important support for ensuring food safety and quality in food packaging by playing the role of preservation, odor barrier, etc., and meeting strict hygiene and safety standards.
