1. PET vacuum bags:

PET primarily refers to polyethylene terephthalate (PET) and polyethylene. PET vacuum bags are colorless, transparent, and glossy. They exhibit excellent mechanical properties, with high rigidity, hardness, and toughness; they are resistant to puncture, abrasion, high temperatures, and chemicals, and also offer good oil resistance, gas barrier performance, and aroma retention. As such, they are one of the most commonly used base materials for barrier‑type composite vacuum bags. They are often employed as the outer layer in retort‑packaging applications and provide good printability. Packaging made from PET is typically chosen when high transparency is required and when the product must withstand high‑temperature retorting.

II. Nylon Vacuum Bags:

Nylon (PA) vacuum bags are highly transparent, exhibit excellent gloss, and boast high tensile and elongation strength. They also offer superior resistance to heat, cold, oils, and organic solvents, along with outstanding abrasion and puncture resistance. These bags are notably soft, provide excellent oxygen barrier properties, and are well suited for packaging rigid items such as oily foods, meat products, fried foods, vacuum‑packed foods, and steamed or boiled foods. Based on nylon vacuum bags, higher‑performance nylon composite bags and multilayer co‑extruded vacuum bags can be developed.

Nylon composite bags typically consist of a base material, laminating adhesives, barrier layers, heat-seal materials, and printing and protective coatings. Multi-layer co-extruded vacuum bags are primarily made of nylon, comprising resins such as PA, EVOH, PE, PP, and TIE, and are structured in either symmetrical or asymmetrical configurations. The incorporation of PA and EVOH significantly enhances the multilayer film’s barrier properties against oxygen and aromas, improves its peel strength, increases environmental resistance, and extends shelf life. These bags offer advantages such as being pollution‑free, providing high barrier performance, delivering robust functionality, maintaining low costs, featuring a compact footprint, exhibiting high mechanical strength, and allowing flexible structural design, thereby enabling a pollution‑free production process for food packaging materials.

III. Aluminum Foil Vacuum Bags:

Aluminum‑plastic composite vacuum packaging bags (PET/AL/PE, PET/NY/AL/PE, or PET/NY/AL/CPP) are primarily composed of aluminum foil. They are opaque, with a silvery‑white appearance and a reflective sheen, offering excellent barrier properties, heat‑sealability, light‑proofing, and resistance to high and low temperatures, oils, and odors. They are non‑toxic, odorless, and flexible. These bags are ideal for moisture‑proof, light‑shielded, vacuum packaging of large precision machinery, chemical raw materials, and pharmaceutical intermediates. Most commonly constructed with a four‑layer structure, they provide superior water and oxygen barriers. Aluminum‑foil vacuum bags are widely used in the food, electronics, and chemical industries. However, because aluminum foil itself is relatively expensive, the overall cost of such vacuum packaging tends to be higher. Moreover, since aluminum foil cannot be heat‑sealed or printed, vacuum bags made from this material typically employ a multilayer composite of three or more layers, further increasing production costs. Aside from price and transparency, aluminum‑foil vacuum bags outperform nylon and PET in all other performance characteristics.

When selecting materials for vacuum‑sealed bags, more expensive doesn’t necessarily mean better; what matters is suitability. Qingdao Platinum Packaging Technology Co., Ltd. approaches every step—from material selection to production—with meticulous care and draws on years of experience.

Contact: Manager Duan

Contact information: 13326397391

Address: No. 506, Guangzhou North Road, Jiaozhou City, Qingdao