In production and life, food packaging bags are often used to protect food in order to keep fresh and store food. Since it is in direct contact with food, food-grade packaging materials should be used. Food packaging bags are generally composed of single-layer or multi-layer materials, but composite materials are widely used in food packaging and occupy a dominant position, which can usually meet the packaging requirements of most foods.

1. Material type

The materials of food packaging bags mainly include PVDC (polyvinylidene chloride), PE (polyethylene), PP (polypropylene), PA (nylon), EVOH (ethylene/vinyl alcohol copolymer), aluminized film (aluminum + PE ) and other main films, the materials usually used for food packaging bags are mainly PP and PE, that is, polypropylene and polyethylene plastics.

2. Features and uses

BOPP/LLDPE two-layer composite material features: moisture-proof and cold-resistant, low-temperature heat-sealing and strong tensile force; use: instant noodles, snacks, frozen snacks, powder products, etc.

BOPP/CPP two-layer composite material features: moisture-proof and oil-resistant, good hand feeling, high transparency and good stiffness; use: dry food such as instant noodles, biscuits, candies, etc., not suitable for packaging refrigerated food and high-temperature sterilization.

BOPP/VMCPP composite material characteristics: light-proof, moisture-proof, oil-proof, oxygen-proof, good sealing; use: dry food, fried food.

BOPP/VMPET/LLDPE three-layer composite material features: moisture-proof, oxygen-proof and light-shielding; use: all kinds of snacks, tea, soup.

PET/CPP two-layer composite material features: moisture-proof, oxygen-proof, fragrance-proof, high-temperature resistant; use: steamed food, food containing alcohol, food with aroma.

PET/PET/CPP three-layer composite material characteristics: moisture-proof and high-temperature resistance, easy to seal; use: sorting, soy sauce, liquid, shampoo.

3. Bag characteristics

Three-side-seal bag: Two side seams and a top seam bag, the bottom edge is formed by folding the film horizontally.

Back-sealed bag shape: also known as the middle-sealed bag, that is, the back, upper and lower seams make them have the shape of a pillow.

Four-side sealed bag: The four air outlets are sealed together to seal the four sides, and the two sides and the bottom are sealed.

Zipper bag shape: A bag with an easy-open zipper on the three-side seal bag and the main body bag.

Good packaging bag materials can not only better protect products, but also beautify products and enhance consumers' desire to buy. Therefore, custom packaging bags are as important as purchasing packaging equipment. You can choose the right one according to your own needs, product characteristics, market positioning and other factors. packaging form.