A Complete Guide to Food Packaging Bag Material Structures - Save This!

Different foods require different material structures for their packaging bags, depending on their characteristics. So, what kind of food is suitable for what kind of material structure as a food packaging bag? Today, Shunxingyuan Packaging, a professional flexible packaging manufacturer, will explain this for everyone. Customers who need custom food packaging bags can refer to this.

1. Steaming and Boiling Packaging Bags

Product Requirements:

Used for packaging meat and poultry, requiring good barrier properties, resistance to puncture from bones, and no breakage, cracking, shrinkage, or odor during sterilization under steaming and boiling conditions.

Design Structure:

Transparent Type: BOPA/CPP, PET/CPP, PET/BOPA/CPP, BOPA/PVDC/CPP, PET/PVDC/CPP, GL-PET/BOPA/CPP

Aluminum Foil Type: PET/AL/CPP, PA/AL/CPP, PET/PA/AL/CPP, PET/AL/PA/CPP

Reasoning:

PET ： High temperature resistance, good rigidity, good printability, high strength.

PA: High temperature resistance, high strength, flexibility, good barrier properties, puncture resistance.

AL: Best barrier properties, high temperature resistance.

CPP: High-temperature resistant for steaming and boiling, good heat sealing, non-toxic and odorless.

PVDC: High-temperature resistant barrier material.

GL-PET: Ceramic vapor-deposited film, good barrier properties, microwave transparent.

For specific products, choose the appropriate structure. Transparent bags are mostly used for steaming and boiling, while AL foil bags can be used for ultra-high temperature steaming and boiling.

2.  Puffed Snacks Packaging Bags

Product Requirements: Oxygen barrier, water barrier, light protection, oil resistance, aroma retention, crisp appearance, bright colors, low cost.
Design Structure:
BOPP/VMCPP
Reasoning:
Both BOPP and VMCPP are crisp. BOPP has good printability and high gloss. VMCPP has good barrier properties, aroma retention, and moisture resistance. CPP also has good oil resistance.

3. Biscuit Packaging Bags

Product Requirements:
Good barrier properties, strong light blocking, oil resistance, high strength, odorless, crisp packaging.
Design Structure:
BOPP/EXPE/VMPET/EXPE/S-CPP
Reasoning:
BOPP has good rigidity, printability, and low cost. VMPET has good barrier properties, light blocking, oxygen barrier, and water resistance. S-CPP has good low-temperature heat sealing and oil resistance.
    4. Milk Powder Packaging Bags

Product Requirements:
Long shelf life, aroma and flavor retention, prevention of oxidation and deterioration, and prevention of moisture absorption and caking.
Design Structure:
BOPP/VMPET/S-PE
Reasoning:
BOPP has good printability, gloss, and strength, and is moderately priced.
VMPET has good barrier properties, light blocking, and toughness, with a metallic luster; enhanced PET aluminum plating is preferred, with a thick AL layer. S-PE has good anti-pollution sealing and low-temperature heat sealing.

5. Green Tea Packaging Bags

Product Requirements:
Prevention of deterioration, discoloration, and change in flavor; that is, prevention of oxidation of proteins, chlorophyll, chlorogenic acid, and vitamin C contained in green tea.
Design Structure:
BOPP/AL/PE，BOPP/VMPET/PE，KPET/PE
Reasoning:
AL foil, VMPET, and KPET are all materials with excellent barrier properties, providing good barrier properties against oxygen, water vapor, and odors. AK foil and VMPET also have excellent light-blocking properties. The product is moderately priced.

6.  Ground Coffee Packaging Bags

Product Requirements:

Water absorption prevention, oxidation prevention, resistance to hardening of the product after vacuuming, and preservation of the volatile and easily oxidizable aroma of coffee.

Design Structure:

PET/PE/AL/PE，PA/VMPET/PE

Reasoning:

AL, PA, and VMPET have good barrier properties, water resistance, and gas resistance, while PE has good heat sealing properties.

7. Chocolate Packaging Bags

Product Requirements:

Good barrier properties, light blocking, beautiful printing, low-temperature heat sealing.

Design Structure:

Pure Chocolate: Varnish/Ink/White BOPP/PVDC/Cold Seal Adhesive

Nut Chocolate: Varnish/Ink/VMPET/AD/BOPP/PVDC/Cold Seal Adhesive

Reasoning:

PVDC and VMPET are both high-barrier materials. The cold seal adhesive can be sealed at very low temperatures, and the heat will not affect the chocolate. Because nuts contain more oil, they are prone to oxidation and deterioration, so an oxygen barrier layer is added to the structure.

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