Food packaging bag material selection criteria
With the rapid development of society, there are all kinds of food in life now, and because of the different characteristics of each food, when packaging food, it is necessary to choose different materials according to the requirements of food characteristics, so in What issues should be paid attention to when choosing packaging bag materials?
1. Biscuit packaging bag
Good barrier property, strong shading property, oil resistance, high strength, odorless and tasteless, and the packaging is quite scratchy.
Design structure: BOPP/EXPE/VMPET/EXPE/S-CPP
Reasons: BOPP has good rigidity, good printability and low cost. VMPET has good barrier properties, avoid light, oxygen and water. S-CPP has good low temperature heat sealability and oil resistance.
2. Green tea bags
Anti-deterioration, anti-discoloration, and anti-taste, that is, to prevent the oxidation of protein, chlorophyll, catechin, and vitamin C contained in green tea.
BOPP/AL/PE, BOPP/VMPET/PE, KPET/PE
Reason: AL foil, VMPET, and KPET are all materials with excellent barrier properties, and have good barrier properties to oxygen, water vapor, and peculiar smell. AK foil and VMPET are also excellent in light protection. The products are moderately priced.
3. Puffed snack food packaging bags
Product requirements: Oxygen resistance, water resistance, light protection, oil resistance, fragrance retention, scratchy appearance, bright colors, and low cost.
Design structure: BOPP/VMCPP
Reason: Both BOPP and VMCPP are quite scratchable, and BOPP has good printability and high gloss. VMCPP has good barrier properties, keeps fragrance and moisture. CPP oil resistance is also better.
4. Milk powder packaging bag
Long shelf life, fragrance and taste, anti-oxidative deterioration, anti-moisture absorption and agglomeration.
Design structure: BOPP/VMPET/S-PE
Reason: BOPP has good printability, good gloss, good strength and moderate price.
VMPET has good barrier properties, light protection, good toughness, and metallic luster. It is better to use enhanced PET aluminum plating, and the AL layer is thick. S-PE has good anti-pollution sealing performance and low temperature heat sealing performance.
5. Ground coffee bags
Anti-water absorption, anti-oxidation, anti-hardness of the product after vacuuming, and keep the volatile and easily oxidized aroma of coffee.
Design structure: PET/PE/AL/PE, PA/VMPET/PE
Reason: AL, PA, and VMPET have good barrier properties, water resistance and gas resistance, and PE has good heat sealing properties.
6. Chocolate bags
Good barrier property, light-proof, beautiful printing, low temperature heat sealing.
Design structure: pure chocolate varnish/ink/white BOPP/PVDC/cold sealant
Brownie Varnish/Ink/VMPET/AD/BOPP/PVDC/Cold sealant
Reason: PVDC and VMPET are high-barrier materials, and the cold-sealing glue can be sealed at a very low temperature, and the heat will not affect the chocolate. Since the nuts contain a lot of oil, which is easy to oxidize and deteriorate, an oxygen-barrier layer is added to the structure.
7. Retort bags
For packaging of meat, poultry, etc., it is required that the packaging has good barrier properties, resistance to bone hole breakage, and no breakage, no cracking, no shrinkage, and no peculiar smell under sterilization conditions.
Design Structure: Transparent: BOPA/CPP, PET/CPP, PET/BOPA/CPP, BOPA/PVDC/CPP, PET/PVDC/CPP, GL-PET/BOPA/CPP
Aluminum foil: PET/AL/CPP, PA/AL/CPP, PET/PA/AL/CPP, PET/AL/PA/CPP
PET: high temperature resistance, good rigidity, good printability and high strength.
PA: High temperature resistance, high strength, flexibility, good barrier properties, and puncture resistance.
AL: Best barrier properties, high temperature resistance.
CPP: High temperature resistant cooking grade, good heat sealing performance, non-toxic and tasteless.
PVDC: high temperature resistant barrier material.
GL-PET: Ceramic vapor-deposited film with good barrier properties and microwave transmission.
For specific products to choose the appropriate structure, transparent bags are mostly used for cooking, and AL foil bags can be used for ultra-high temperature cooking.