Introduction to Plastic Films

Introduction to Plastic Films

Films made from polyvinyl chloride, polyethylene, polypropylene, polystyrene, and other resins are used for packaging and as laminates.

Food packaging accounts for the largest proportion of these products, such as beverage packaging, frozen food packaging, steamed food packaging, and fast food packaging.

Polyester Film (PET)

Polyester film is a film material made of polyethylene terephthalate as raw material, which is extruded into thick sheets by extrusion method and then made by bi-directional stretching. It is a colorless, transparent, glossy film with excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance, friction resistance, high and low temperature resistance, chemical resistance, oil resistance, airtightness and good aroma retention, and is one of the commonly used substrates for permeation-blocking composite films. It is commonly used as the outer layer material of steaming packaging with good printability.

Nylon Film (PA)

Nylon film is a very tough film, good transparency, and has a good gloss, tensile strength, tensile strength is higher, but also has good heat resistance, cold resistance, oil resistance and resistance to organic solvents, abrasion resistance, puncture resistance is excellent, and relatively soft, oxygen barrier is excellent, but the barrier to water vapor is poor, moisture absorption, moisture permeability is greater, the heat sealing of the poor, suitable for packaging of hard goods, such as greasy It is suitable for packing hard goods, such as greasy food, meat products, fried food, vacuum-packed food, steamed food and so on.

Low-density polyethylene film (LDPE)

LDPE films are generally made by blow molding and casting processes. Cast polyethylene film has a uniform thickness but is most widely used due to its higher price and lower cost. LDPE film is a semi-transparent, glossy, softer texture film with excellent chemical stability, heat sealability, water and moisture resistance, freezing resistance and can be boiled. Its main drawback is the poor barrier to oxygen, commonly used in composite flexible packaging materials, the inner layer of the film, but also the most widely used, the largest amount of a plastic packaging film, accounting for more than 40% of the consumption of plastic packaging film.

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