Understand the classification of food packaging materials
What are the classifications of food packaging bags?
Name abbreviation characteristics water resistance gas resistance mechanical strength extensibility low temperature resistance high temperature resistance transparency polyethylene PE good difference not high pressure low density polyethylene LDPE difference low good high pressure low pressure high density polyethylene HDPE higher than LDPE the LLDPE difference of linear low density polyethylene below LDPE is higher than that of LDPE polypropylene (BOPP, OPP)
PP's lightest plastic for food packaging has a similar water vapor transmission rate to HDPE and a similar oxygen transmission rate, which is higher than PE and PE-
The main disadvantage of polystyrene PS with excellent brittleness at 17℃ is poor brittleness, which is lower than PE and has good hardness and brittleness; Poor impact resistance, good and poor, 60 ° C-80 °c is good, up to 88%-
92% name printing performance, heat sealing, compliance, processability, hygiene and safety, poor application range of polyethylene, need to be handled well, adapt to the freezing treatment of food, high-pressure low-density polyethylene is mainly made into film, it is used for fresh-keeping packaging of fresh fruits and vegetables for food with lower packaging requirements and dry food with moisture-proof requirements;
Packaging of frozen food low-pressure high-density polyethylene is lower than LDPE and lower than LDPE. Compared with LDPE, raw materials can be saved under the same strength, as the heat sealing layer of the composite film, linear low-density polyethylene is better than HDPE for packaging high-temperature sterilized food. It is mainly used for packaging meat, frozen food and dairy products, with poor gas resistance, can not meet the long-term retention requirements of polypropylene (BOPP, OPP)
Poor, need to deal with higher than PE film need to be directionally stretched than CPP, packaging oily food, can replace glass paper packaging snacks, bread, it can be used as a twisted package for candy and snacks to make various forms of ropes, polystyrene, non-toxic, tasteless and transparent food boxes and fruit bowls. The color and color foaming EPS can be used as insulation and cushioning packaging materials, for example, the materials used in common food packaging bags in fast food boxes are divided into six categories: 1. Materials: BOPP/LLDPE two-layer composite characteristics: moisture-proof, cold-resistant, low-temperature heat sealing and strong tensile strength. Uses: instant noodles, snacks, frozen snacks, powder packaging, etc. 2, material: BOPP/CPP two-layer composite characteristics: moisture-proof, oil-resistant, high transparency, good use: instant noodles, biscuits, candy, all kinds of light food 3, material: BOPP/VMCPP composite characteristics: moisture-proof, oil-resistant, oxygen-proof, shading, good composite bag use: all kinds of dry food, fried food, potato chips 4, material: BOPP/VMPET/LLDPE three-layer composite characteristics: moisture-proof, oxygen-proof, shading uses: all kinds of food, rice snacks, snacks, tea 5, material: PET/CPP two-layer composite characteristics: moisture-proof, oxygen-proof, fragrance, high temperature resistant use: cooking, alcoholic food, scented food 6, material: PET/CPP three-layer composite characteristics: moisture-proof, high temperature resistant, easy to seal use: powder packaging, soy sauce, liquid, shampoo