Materials and Characteristics of Automatic Packaging Roll Film
Automatic packaging roll film materials include aluminum foil, metallized film, pure aluminum, two-layer composites, and easy-tear films, each with its own characteristics. Automatic packaging roll films can be broadly classified into five categories based on material: photocatalytic inorganic antibacterial agent films, polymer antibacterial agent films, composite antibacterial agent films, inorganic antibacterial agent films, and organic antibacterial agent films. The material of plastic roll films is similar to that of everyday plastic bags, with common types including PVC shrink film, polypropylene (OPP) film, polyethylene (PE) film, PET film, and composite roll films. Composite roll films are suitable for vacuum packaging or general packaging of food, electronic products, chemicals, pharmaceuticals, tea, precision instruments, and high-end defense products.
The following are common automatic packaging composite roll films.
PET/PE Composite Roll Film: The material of OPET/LDPE composite film is polyethylene terephthalate and high-pressure polyethylene, commonly abbreviated as PET/PE composite bags. They have high transparency and good oxygen barrier properties, making them particularly suitable for inflating packaging of foods like bread and cakes. Due to their excellent heat and cold resistance, they can also be used for packaging frozen foods and ready-to-eat meals.
BOPP/CPP Composite Roll Film: The material of BOPP/CPP composite film is biaxially oriented polypropylene and non-oriented polypropylene, commonly referred to as OPP/CPP composite film bags. Among all composite films, this type has relatively high transparency. Compared to single-film plastic bags, these composite films are more costly at the same thickness but have a better hand feel. Due to their excellent moisture barrier properties, they are mainly used for packaging dry foods and fast foods like biscuits and instant noodles. However, their disadvantage is poor high-temperature and cold resistance, making them unsuitable for packaging refrigerated and high-temperature sterilized foods.
OPP/PE Composite Roll Film: BOPP/LDPE composite film consists of biaxially oriented polypropylene and high-pressure polyethylene composite film bags, commonly abbreviated as OPP/PE composite film. These composite bags have excellent gas and moisture barrier properties, making them particularly suitable for packaging products like green tea. They also have good oil resistance, so they are used for packaging cooked foods and some oil-based products.
