Vacuum Bag: The Magician Who Controls Time and Space for Food Packaging

Have you ever encountered such troubles: the fresh meat you just bought turns oxidized and discolored within two days; the wardrobe is stuffed to the brim with seasonal clothes; the precious tea leaves lose their original flavor after not long... Actually, to solve these daily problems, all you need is a small vacuum bag.

A vacuum bag is just such a transparent （printable） three-side sealed bag. Its surface can be made smooth or have a rough surface with special patterns. In the following, this article will take you to understand this helper in our daily life from aspects such as material structure, working principle, and application scenarios.

Material Structure:

Mainstream vacuum bags adopt multi-layer co-extruded composite films, with typical structures being PA/PE or PA/AL/PE composite systems

· Outer layer PA (polyamide): Resistant to mechanical damage from sharp objects

· Middle layer AL (aluminum foil, optional): Enhances barrier performance

· Inner layer PE (polyethylene): Provides heat-sealing property and low-temperature resistance

In addition to specific material combinations, the special three-dimensional texture design on the bag body also plays a very important role, which allows air to be discharged more smoothly. The vacuuming efficiency is 40% higher than that of ordinary flat-textured bags, and when used with a household air pump, the sealing operation can be completed in 30 seconds.

Thanks to such a powerful material structure and talented structure, vacuum bags not only can ensure their own high strength, but also can work with vacuum pumping machines to effectively isolate oxygen, moisture and  dust, allowing food to maintain a good state for a long time.

Working Principle:

The core working principle of vacuum bags is to extract air from the bag using an air extraction device, creating a near-vacuum state inside the bag, which is then quickly sealed. This approach offers the following benefits:

· Reducing oxygen: It inhibits the growth and reproduction of microorganisms such as bacteria and mold, delaying the spoilage of food.

· Preventing oxidation: It avoids the oxidation of nutrients like fats and vitamins in food, maintaining the flavor and nutritional value of food; for metal products, it can prevent oxidation and rusting.

 · Compressing volume: After air is pumped out, the volume of items is compressed, making them easier to store and transport, and saving space.

Application scenarios of vacuum bags:

· Food industry: This is the primary application field of vacuum bags, which are often used for packaging meat, fish, seafood, cooked food, pickled products, dried fruits, grains, etc. They can significantly extend the shelf life of food and maintain its freshness.

· Industrial field: They can be used for packaging precision instruments, electronic components, metal parts, etc., to prevent them from getting damp, rusting or being damaged during storage and transportation.

· Household life: Many families use small vacuum packaging machines and vacuum bags to store leftover food, seasonal clothes, bedding, blankets, etc., which can not only save storage space but also prevent moisture and insects.

· Medical field: They are used for packaging medical devices, disinfected items, etc., to ensure they remain sterile before use.

In conclusion, vacuum bags play an important role in various fields with their excellent fresh-keeping and protective properties, providing convenience for the storage and transportation of items.

Food Packaging

Vacuum Bag

Plastic Food Bag