Antibacterial packaging materials made by adding a certain amount of antibacterial agents to food packaging materials can be divided into anti-packaging films, antibacterial hollow containers, antibacterial bags, and antibacterial turnover boxes, among which food antibacterial packaging films are the most widely used. The following simple antibacterial packaging film knowledge.
There are many ways to prepare antibacterial food packaging films. One is that the antibacterial agent is made into an antibacterial masterbatch, which is prepared by extrusion or flow of an antibacterial agent or an antibacterial masterbatch and a resin monolayer, or can be formed by coextruding as a surface layer and other layers to form an antibacterial composite film. Another is obtained by coating or vapor-depositing an antibacterial agent on a resin film.
For the antibacterial packaging film produced by the antibacterial masterbatch, since the thickness of the film itself is thin, the particle size of the antibacterial particles is required to be small, and a relatively narrow particle size distribution or an organic antibacterial agent that can be dissolved in the resin is required.
The addition of general antibacterial agents or antibacterial masterbatches has little effect on the mechanical properties of the film, and has no adverse effect on the printing performance of the packaging film. However, the barrier properties of some packaging films have a certain influence, so when selecting antibacterial agents and antibacterial masterbatch, attention should be paid to the influence of the addition of antibacterial agents and antibacterial masterbatches on the performance of the film, and select the appropriate antibacterial agent to ensure the packaging. Performance meets usage requirements. General choice of packaging materials are LDPE, LLDPE, EVA, cellulose film, edible film and so on.
In addition to meeting the required performance of packaging materials such as mechanical properties, printing performance, and display performance required for the packaging of foods, antibacterial packaging films for foods have high requirements for sanitary performance of food packaging materials used in the world.
China's national standard GB-9687 stipulates the sanitary requirements for food packaging materials, requiring that the material be of normal color, no odor, no smell, no foreign matter, and in the evaporation residue, potassium permanganate consumption, heavy metal content, decolorization experiments, etc. Aspects meet the corresponding requirements. The FDA has also made specific provisions on the composition of food packaging materials, additive specifications, conditions of use, dissolution requirements, chronic toxicity test requirements for food packaging materials, and subchronic toxicity test requirements.
How to prepare food antibacterial packaging film?
May 14 04:06:15, 2024
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