I. Core Characteristics of Vacuum Aluminum-Plastic Bags

(I) Synergistic Protection of High-Efficiency Barrier and Vacuum Sealing

The core advantage of vacuum aluminum-plastic bags lies in the synergistic effect of the "aluminum-plastic composite layer" and the "vacuum environment," which can comprehensively isolate external interference factors. In the aluminum-plastic composite layer, the oxygen permeability of the aluminum foil layer can be as low as 0.1cc/(m²・24h・atm), and the water vapor permeability is less than 1g/(m²・24h), completely blocking the intrusion of oxygen, water vapor, ultraviolet rays, and odors. The outer plastic layer (such as PET, PA) enhances puncture resistance and mechanical strength, preventing damage to the aluminum foil layer during use. Combined with vacuum sealing technology, the residual air inside the bag can be controlled to below 1%, forming a near-oxygen-free and water-free sealed environment, significantly inhibiting microbial growth and material oxidation—for example, after meat products are packaged in vacuum aluminum-plastic bags, the shelf life can be extended from 3-5 days with ordinary packaging to 30-60 days, while maintaining the meat's tenderness and reducing nutrient loss.

For high-humidity scenarios (such as the rainy season in southern China and coastal storage), vacuum aluminum-plastic bags can also contain desiccants (such as montmorillonite desiccant, with a moisture absorption rate ≥20%) to further control the relative humidity inside the bag at 25%-30%, preventing food from becoming damp and moldy, electronic components from short-circuiting, and pharmaceutical products from absorbing moisture and deteriorating. For example, when traditional Chinese medicine decoction pieces are packaged in vacuum aluminum-plastic bags, the moisture absorption rate drops from 8% with traditional paper bags to below 1%, effectively maintaining the content of the effective components of the medicinal materials.

(II) Excellent Physical and Mechanical Properties

Vacuum aluminum-plastic bags, through their multi-layer composite structure design, possess excellent impact resistance, puncture resistance, and temperature resistance, making them suitable for diverse usage scenarios. In common composite structures (PET/AL/PE, PA/AL/PE), the PET layer has a tensile strength ≥180MPa, resisting friction damage during transportation; the PA layer has a puncture resistance ≥80N, preventing products with sharp edges (such as meat with bones or nuts) from puncturing the bag; the PE layer has excellent heat-sealing properties, with a heat-sealing strength ≥30N/15mm, ensuring a tight vacuum seal. Experimental data shows that when dropped from a height of 1.2 meters, the integrity rate of vacuum aluminum-plastic bags containing granular products can reach over 92%, far exceeding that of ordinary PE vacuum bags (integrity rate approximately 65%).

In terms of temperature resistance, vacuum aluminum-plastic bags can withstand temperatures ranging from -40℃ to 121℃: At low temperatures, the bags are less prone to cracking, making them suitable for long-term storage of frozen foods (such as frozen dumplings and seafood); at medium to high temperatures, some structures (such as PET/AL/PE) can withstand 121℃ heat sterilization, meeting the packaging requirements of canned goods, cooked foods, and other products requiring sterilization, while maintaining good sealing and barrier properties after sterilization.

(III) Flexible Customization and Ease of Use

Vacuum aluminum-plastic bags offer comprehensive customization services based on product characteristics and usage scenarios:

Specification Customization: Sizes range from small bags (5cm×5cm, such as snack and pill packaging) to large bags (2m×1.5m, such as grain and chemical raw material packaging), with volumes ranging from tens of milliliters to hundreds of liters, adapting to products of different weights and shapes.

Customized Structure: For products requiring multiple openings (such as snacks and tea), zippered structures can be designed for repeated sealing; for liquid or powdered products (such as sauces and coffee powder), stand-up pouches can be made for easy access and storage; for irregularly shaped products (such as whole poultry and large meat products), custom-made stand-up pouches or irregularly shaped pouches can be used to reduce packaging gaps and improve protective effect.

Customized Function: Antistatic layers (surface resistance 10^6-10^11 Ω) can be added to electronic component packaging to prevent electrostatic discharge from damaging components; aseptic composite materials can be used for pharmaceutical product packaging, meeting GMP standards; transparent PET layers can be used for food packaging, allowing consumers to easily observe the contents.

In terms of ease of use, vacuum aluminum-plastic bags are usually designed with easy-tear edges for quick opening without tools; some products are equipped with dedicated vacuum extraction ports, compatible with both household and industrial vacuum packaging machines, allowing businesses and individuals to operate flexibly according to their needs.