Material Selection: Packaging bags for frozen foods should be made from materials that can withstand low temperatures without becoming brittle or cracking. Common materials include polyethylene (PE) and polypropylene (PP), which offer good cold resistance and durability.
High Barrier Properties: The packaging should have high barrier properties to prevent exposure to oxygen, moisture evaporation, and contamination. This is crucial to maintain the freshness and quality of the product.
Impact and Puncture Resistance: The packaging must be able to withstand impacts and punctures. It should offer excellent softness, oxygen barrier properties, and the ability to resist damage during handling, ensuring food safety and product integrity.
Low-Temperature Resistance: Packaging must maintain its strength and form at low temperatures, typically as low as -45°C. It should not deform or become brittle, which could compromise the product.
Tensile Strength and Heat Resistance: The packaging should have high tensile strength, which allows it to withstand stress during handling and transportation. It should also exhibit good heat and cold resistance, as well as oil resistance to protect the food from external contaminants.
Hygienic Properties: The packaging should prevent contamination, dust accumulation, and the migration of harmful substances into the food. This is vital for maintaining food safety.
Sealing Performance: Packaging must provide excellent sealing to prevent air ingress, moisture absorption, or frost formation. Common sealing methods include heat sealing or zipper sealing, which ensure the bags remain securely closed during storage and transport.
Breathability: Certain frozen foods (like vegetables and fruits) may require breathable packaging to avoid spoilage caused by oxygen deprivation. Such packaging is often designed with small pores to allow air exchange while maintaining the integrity of the product.
Clear Labels and Dates: Packaging should clearly display important information such as production dates, shelf life, storage conditions, and other relevant details. Labels must be waterproof and oil-resistant to avoid fading or peeling during freezing or thawing.
Appropriate Size and Weight: Choose the right size of packaging bags based on the food type and quantity. Too small a bag can compress the food, while too large a bag may waste storage space.
Freeze Crack Resistance: Especially for long-term frozen storage, packaging bags must be resistant to freezing cracks to ensure the quality and safety of the food.
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