In our daily life, the quality of food packaging is very important to us. Substandard food packaging bags can cause serious harm to our body. So what should we know before purchasing food packaging bags? Let's introduce it to you below.
First, the packaging film must meet the national standards
Food companies must first figure out what materials they need for food packaging bags; second, they need to find regular packaging companies for custom processing. Because of the lack of professional knowledge of packaging materials and the pursuit of low prices, some food companies have been confused from time to time.
Take composite bags as an example. Many foods are used for vacuum packaging. The material of this type of packaging should have at least one layer of nylon packaging. However, some composite packaging bags on the market are cut-off and do not have nylon materials. Instead, they use polyester plastic (PET). Because nylon is twice as expensive as PET. As a result, the piercing resistance of the bag is weak, causing the food package to leak air and break the bag. The economic loss and negative impact are far higher than the cost savings of the low-cost bag purchase. Another example is the seven-layer co-extruded packaging bag of the new packaging material. At least two layers of nylon are used, but some packaging companies use only one layer, and the nylon content is low, and some also use smuggled garbage, which has more problems. Such bags have poor barrier properties, are easy to break, and are not resistant to high and low temperatures. At present, there are cases in which aluminum foil bags are used to sell food products to food companies in the market, and they need to be identified in time to prevent being deceived.
Second, food packaging bags must meet food safety and quality requirements
1. Food companies should require packaging bag manufacturers to use packaging films that meet national standards. For example, the material of the composite bag should be green and environmentally friendly. Do not use dry composite plastic packaging containing benzene and other harmful substances, because the solvent easily penetrates and contaminates food.
2. The food packaging bag should be flat. No scratches, scalds, bubbles and wrinkles, no false seals. Flatness is not only an aesthetic requirement, but also about the quality of the food. If the bag seal is not flat, food packaging used for high-temperature cooking or low-temperature freezing will easily crack.
3. Use green materials for printing. The QS standard requires that food packaging must not detect benzene solvents that are harmful to human health, but because benzene solvents are about 30% cheaper than environmentally friendly benzene-free and ketone-free solvents, and they have good brightness and color fastness, so many This kind of material is also used in the printing of packaging bags, and the problem of contaminating food often occurs.
4. The production environment of packaging enterprises making food bags must meet the standards to avoid contamination of food bags during bag making.
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