Why can aluminum foil be used as food packaging bags? Why do food packaging bags use aluminum foil?
Aluminum foil for food is a flattened metal aluminum tool that can be used in the kitchen to cook, hold food, or make materials that can be easily cleaned.
Aluminum foil packaged foods on the market are generally reheatable and storage-resistant. Most of the aluminum foil used in food processing has a bright side and a gray dull side. Aluminum foil paper for food can be used to wrap food on both sides. It is usually recommended to wrap food on the glossy side to improve the heat conduction effect.
Aluminum foil is used in food packaging bags because of its good barrier properties. The oxygen transmittance of aluminum foil is extremely low, which can effectively block gases in the air that can easily cause food to deteriorate, such as oxygen. And aluminum foil is opaque and has good light-shielding properties, preventing certain foods from discoloration or deterioration due to exposure to light. Aluminum foil itself has extremely poor corrosion resistance and is easily corroded by acidic or alkaline substances.
Food packaging bags are not simply made of aluminum foil, but are made of composite materials. This composite material is made of aluminum foil and nylon. Some are made of four-layer co-extruded film. In some packaging When it comes to food, it is often a multi-layered composite material.
The reason for using multi-layer composite materials is to package food and maintain the quality of the food. Another reason is that rich colors and patterns can be printed on food packaging bags. This is also a way for food to be recognized by the market, and it is also a way for food promotion. necessary way.
Aluminum foil material for food packaging bags is an extremely thin sheet formed from high-purity aluminum after repeated rolling. It is an excellent thermal conductor and light shielding body.
Food aluminum foil bags are divided into general packaging and high-temperature cooking. Aluminum foil bags for general packaging are PET/NY/AL/PE.
, temperature resistance is -50℃ to 100℃, retort aluminum foil bag is PET/NY/AL/PP
, resistant to high temperature 120℃. Food aluminum foil bags have the characteristics of good vacuuming effect, high transparency, low oxygen permeability, good moisture-proof performance, high tensile strength and puncture resistance, easy heat sealing, good sealing, and not easy to age.
