How Much Do You Know about Food Grade Film
Today, food grade films are widely used, and almost all food packaging will have a layer of film attached, which not only keeps the food fresh, but also protects the food from spoilage, such as sachet roll packing film. So do you know about this edible film food packaging, let's explore it!
What is a food grade film?
Nowadays, composite film has a leading position in the food grade film industry. Composite film is a film composed of two or more materials, generally made of plastic, aluminum foil, paper and other materials by bonding and heat sealing, and has a protective function. Bags made of composite films are called composite bags.
What standards should edible film food packaging meet?
There are currently 8 national and industry standards issued for plastic composite film (bag) products for food packaging. The main indicators of the standards are divided into physical and mechanical performance indicators and hygienic performance indicators.
Among them, the physical and mechanical performance indicators mainly include tensile force at break (or tensile strength), elongation at break, peel force, heat sealing strength, anti-pendulum impact energy, water vapor transmission rate, oxygen transmission rate, pressure resistance of bags, bags drop performance, heat and medium resistance, oil resistance, cold resistance, heat resistance, etc.
Hygienic performance indicators include sensory, toluenediamine, evaporation residue (4% acetic acid), evaporation residue (n-hexane), evaporation residue (65% ethanol), consumption of potassium permanganate (water), heavy metals (calculated as Pb), decolorization, solvent residues, sterilization indicators, etc.
Generally, the packaging bag and its soaking liquid should not have any odor. Toluene diamine is a commonly used adhesive for composite films in China. They will migrate into the food through the inner layer of the bag, and these free monomers will hydrolyze to aromatic amines immediately in contact with water at high temperature, such as TDI hydrolyzed to toluenediamine (TDA).
Toluene diamine is a moderately toxic substance with mutagenic activity and carcinogenicity to laboratory animals, thus causing harm to the health of consumers. Therefore, GB9683-1988 "Hygienic Standard for Composite Food Packaging Bags" stipulates the index of toluene diamine to control the migration of free aromatic isocyanates.
Which foods are packaged in composite film bags?
Common foods on the market such as instant noodles, biscuits, puffed foods, candies, milk, milk powder, beverages, cooked foods, beef jerky, chestnuts, mustard and other foods sold in flexible packaging are all packaged in composite film bags.
How to identify the quality of composite film bags for food packaging?
- Smell. Some inferior composite film bags have solvent residues and irritating odors.
- Scrape the coating on the surface of the composite film bag by hand. The inferior composite film bag coating has poor adhesion and will fall off.
- Observe whether the composite film bag has delamination. Inferior composite film bags have low composite strength and are prone to delamination.
- Check whether the sealing of the bag mouth of the composite bag is firm, and whether the composite film bag can withstand a certain amount of tearing and pulling.
The quality of food packaging bags largely affects our health, it will also affect the quality or shelf life of the packaging, so choose food packaging bags carefully! We are a professional manufacturer of food packaging bags, providing customers with premium sachet roll packing film, any questions, please feel free to contact us!