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Requirements for food packaging film

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there are many methods to prepare food antibacterial packaging film. One is to make antibacterial agent into antibacterial masterbatch, which is prepared by extrusion or salivation of antibacterial agent or antibacterial masterbatch and resin monolayer. It can also be extruded together with other layers as surface layer to form antibacterial composite film. Another is obtained by coating or evaporating antibacterial agent on resin film
for the antibacterial film prepared from the antibacterial masterbatch, due to the thin thickness of the film itself, the particle size of the antibacterial particles is required to be small, with a relatively narrow particle size distribution or an organic antibacterial agent that can be dissolved in the resin. Generally, the addition of antibacterial agent or antibacterial masterbatch has no obvious effect on the mechanical properties of the film, and has no adverse effect on the printing properties of the film. However, it has a certain impact on the barrier performance of some films. Therefore, when selecting antibacterial agent and antibacterial masterbatch, we should pay attention to the impact of the addition of antibacterial agent and antibacterial masterbatch on the performance of films, and select appropriate antibacterial agent to ensure that the performance of packaging meets the use requirements. Generally, the selected packaging materials include LDPE, LLDPE, EVA, cellulose film, edible film, etc
for the method of coating or evaporating antibacterial agent on the film, the barrier performance of different plastics varies greatly. If the substrate is not damaged during the coating and coating process, it can still affect the quality of the final product. The surface properties, performance polarity, surface roughness, the percentage of oxygen and nitrogen atoms on the surface of plastic film will affect the bonding strength between the film and antibacterial agent, thus affecting the antibacterial properties. In addition, before the antibacterial agent is coated or evaporated on the film, the surface of the film substrate should be pretreated in advance to improve its surface land energy and adhesion. The packaging film substrates used for coating or evaporation generally include pet, PA, PVC, BOPP, LDPE, etc
in addition to meeting the mechanical properties, printing properties, display properties and other necessary properties of packaging materials required by commodity packaging itself, all countries in the world have high requirements for the hygienic properties of packaging materials for food products. China’s national standard gb-9687 stipulates the hygienic requirements for food packaging materials, which requires that the materials have normal color, no peculiar smell, smell and foreign matters, and meet the corresponding requirements in terms of evaporation residue, potassium permanganate consumption, heavy metal content and decolorization test. FDA has also made specific provisions on the composition of food packaging materials, additive specifications, service conditions, dissolution requirements, chronic toxicity test requirements of food packaging materials, sub chronic toxicity test requirements, etc
as a compound antibacterial agent used for food packaging, triazine antibacterial agent is a compound antibacterial agent composed of organic antibacterial agent triazine mildew inhibitor and pyridine antibacterial agent in the Japanese market. Its antibacterial effect is increased by 3-4 times. The compound antibacterial agent of organic antibacterial agent and inorganic antibacterial agent developed by the National Engineering Research Center of helco chemical engineering plastics overcomes the problem of single function of kfhs series antibacterial agent. In addition, nano-TiO2 can be added to inorganic silver antibacterial agents in food packaging films to solve the problem of slow antibacterial effect of silver antibacterial agents

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