Vacuum bags, also known as airtight moisture-proof bags, aluminum foil bags, or aluminum-plastic composite bags, are a packaging method that involves placing products in a sealed container and removing the internal air to achieve a predetermined vacuum level. Here is a detailed introduction to vacuum bags:

Materials and Structure

Vacuum bags are usually made of composite materials such as PET/AL/CPE or PET/NY/AL/CPE. PET material has good printing properties; NY material has low oxygen permeability; AL material has strong barrier properties and is opaque; CPE is used as the inner packaging layer. These materials are combined together through a specific process to form a vacuum bag with high barrier properties. In addition, the sealing area of the vacuum bag usually uses water-soluble adhesive, which is more hygienic, environmentally friendly, and leaves no solvent residue.

Characteristics and Functions

1. Vacuum-capable: Tools such as air pumps can be used to extract air from the bag, creating a vacuum state.

2. Oxygen and Moisture Barrier: Due to the use of high-barrier composite materials, vacuum bags effectively block oxygen and moisture, thus providing moisture-proof, mildew-proof, and antioxidant functions.

3. Dust and Insect Proof: Placing items in a vacuum bag and creating a vacuum isolates them from external dust and insects.

4. Space Saving: After vacuuming, the volume of items is significantly reduced, making them easier to store and carry.

Applications and Classifications

Vacuum bags are widely used in the food, chemical, pharmaceutical, and electronics industries. In the food industry, vacuum bags are often used to package meat, vegetables, and dried goods to maintain food freshness and nutrition. In the chemical and pharmaceutical industries, vacuum bags are used to package chemical raw materials and pharmaceuticals, providing moisture-proof, mildew-proof, and antioxidant functions. In the electronics industry, vacuum bags are used to package electronic components and circuit boards, providing dust-proof, moisture-proof, and antioxidant functions.

According to different materials and uses, vacuum bags can be divided into various types, such as PE vacuum bags, PP vacuum bags, PA vacuum bags, and three-side sealed vacuum bags. Among them, PE vacuum bags and PP vacuum bags are important components of vacuum bag products. PE vacuum bags have excellent softness and sealing properties, allowing them to closely fit food and provide better protection; while PP vacuum bags have higher impact resistance and stronger mechanical properties.

Usage Precautions

1. Before using the vacuum bag, ensure that the bag is not damaged or cracked.

2. When placing items in the vacuum bag, they should be thoroughly dried and any packaging paper or bags should be removed to avoid affecting the compression effect.

3. During operation, be careful to prevent sharp objects from scratching the vacuum bag.

4. When sealing, ensure that the sealing area is clean and use the slider to repeatedly pull it across the sealing area several times to ensure the sealing effect.

5. When evacuating air, continue to evacuate until the bag is noticeably flattened. After evacuation, check again to ensure the seal is tight.

Maintenance and Care

1. Avoid exposing vacuum bags to high temperatures or humid environments, as this may affect their performance and service life.

2. If the vacuum bag has cracks or small holes, they can be repaired with wide transparent tape.

3. Vacuum bags that are not used for a long time should be stored in a dry and ventilated place, avoiding direct sunlight.

In summary, vacuum bags are composite material packaging containers with high barrier properties, moisture-proof, mildew-proof, and antioxidant functions. They are widely used in various fields, bringing great convenience to people's lives and work. When using vacuum bags, care should be taken to follow the usage precautions and maintenance methods to ensure their performance and service life.

Vacuum packaging is a method of packaging products in an airtight container and then removing the air from the container to achieve a predetermined vacuum level within the sealed container.