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Food packaging bag material structure introduction

    Different foods need to choose food packaging bags with different material structures according to the characteristics of the food. So what kind of food is suitable for what material structure to use as a food packaging bag, today is the professional flexible packaging manufacturer Shanghai Duxia Industry and Trade Co., Ltd. For your interpretation, customers who need customized food packaging bags can refer to it.
1. Retort packaging bag
Product requirement:
It is used for the packaging of meat and poultry. It requires the packaging to have good barrier properties, resistance to bone hole breaking, and sterilization without breaking, cracking, shrinking, and odorless under cooking conditions.
Design structure:
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 property, high temperature resistance.
CPP: High temperature resistant cooking grade, good heat sealability, non-toxic and tasteless.
PVDC: high temperature resistant barrier material.
GL-PET: Ceramic evaporation film, good barrier property, microwave transparent.
Choose a suitable structure for specific products. Transparent bags are mostly used for cooking, and AL foil bags can be used for ultra-high temperature cooking.


2. Puffed snack food packaging bag
Product requirements: oxygen blocking, water blocking, light-proof, oil-resistant, fragrance-preserving, scratchy appearance, bright colors, and low cost.
Design structure:
Both BOPP and VMCPP are quite scratchy, BOPP has good printability and high gloss. VMCPP has good barrier properties, keeping fragrance and moisture. CPP also has better oil resistance.


3. Biscuit packaging bag

Product requirement:
Good barrier properties, strong shading, oil resistance, high strength, odorless and tasteless, and the packaging is scratchy.
Design structure:
BOPP has good rigidity, good printability and low cost. VMPET has good barrier properties, prevents light, oxygen, and water. S-CPP has good low temperature heat sealability and oil resistance.


4. Milk powder packaging bag products
Requirements: long shelf life, fragrance and taste, anti-oxidation and deterioration, anti-moisture-absorption and caking. 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 has a metallic luster. It is better to use reinforced PET aluminum plating, and the AL layer is thick. S-PE has good anti-pollution sealability and low temperature heat sealability.


5. Green tea packaging bag products
Requirements: Anti-deterioration, anti-discoloration, and anti-distortion, that is, to prevent the oxidation of protein, chlorophyll, catechin and vitamin C contained in green tea.
Design structure: 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 odors. The light shielding properties of AK foil and VMPET are also excellent. The product price is moderate.


6. Ground coffee packaging products
Requirements: Anti-absorption, anti-oxidation, resistance to hard lumps of the product after vacuuming, and keep the volatile and easily oxidized aroma of coffee.
Design structure: PET/PE/AL/PE, PA/VMPET/PE
Reasons: AL, PA, VMPET have good barrier properties, water and gas barriers, and PE heat sealability.


7. Chocolate packaging bag products
Requirements: good barrier properties, light protection, beautiful printing, low temperature heat sealing.
Design structure: pure chocolate varnish/ink/white BOPP/PVDC/cold sealant praline varnish/ink/VMPET/AD/BOPP/PVDC/cold sealant
Reason: PVDC and VMPET are both high barrier materials. The cold sealant can be sealed at very low temperature, and the heat will not affect the chocolate. Since the nuts contain more oil and are easy to oxidize and deteriorate, an oxygen barrier is added to the structure.

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