Because composite materials have superior performance, and so the packaging was in the area of large-scale application. Plastic packaging materials biggest advantages, through a variety of methods can be easily adjust material properties to meet a variety of needs can be made of composite films and multilayer plastic bottles, light and not easily damaged, convenient transport and carry. Plastic packaging materials transparent, bright and clean, smooth, easy to print and modeling decoration, landscaping goods appearance, improved merchandise display performance.
Most of plastic food packaging can be used for beverage, which is the largest amount of the low prices of polyolefin. Commonly used types of plastic: polyethylene, polyvinyl chloride, polypropylene, polyester, polyethylene vinylidene chloride and polycarbonate.

Polyethylene (PE)

Polyethylene is the world's largest output of synthetic resin, is the largest consumption of plastic packaging material, plastic packaging material about the 30 percent.

Low density polyethylene (LDPE) better transparency, flexibility, elongation, impact resistance and low temperature tolerance of HDPE for more distinctions, in the amount of the various types of packaging is still larger, but as food packaging materials than its obvious shortcomings .

High-density polyethylene (HDPE) has high crystallinity, allowing the use of high temperature, its hardness, hermetic, machinery of the chemical resistance properties are better, so extensively used the bottles made of such Blow Molding hollow containers. Because of its higher oil-resistant properties, widely used to contain milk, milk products, fruit juices and packaging of natural foods such as jam. However HDPE-the-poor, and put food and drink not long possession. But it can be used with heat sealing good performance characteristics, as the inner membrane composite materials. If the two-story, three-tier composite materials, used in beverage packaging has been substantial, the United States has adopted cellophane / adhesive / PE composite professionals Shing lemon juice bottles.

Polyvinyl chloride (PVC)

PVC plastic products can be broadly classified into hard, soft and paste manufactures three types of products. Hardware products plasticizer is normally less than 5%, plasticizer in soft products up more than 20%.

Rigid PVC due to non - or rarely contain plasticizers, plasticizers their products without the odor, and excellent mechanical strength, light, chemical nature and stability, so containers made of PVC widely used for beverage packaging. With injection stretch blow the production of PVC bottles seamless line,瓶壁thickness uniformity, can be used for costumes, such as carbonated drinks such as Coca Cola.

The safety of PVC material has been a concern. PVC resin used in the packaging of vinyl chloride content must not exceed 1 × 10-6, or 1 kg of PVC resin containing 1 mg of only allowing vinyl chloride monomer, used in the production of PVC resin bottle beverage packaging, in the food the vinyl chloride monomer could not be determined.

Polypropylene (PP)

Polypropylene film is a high-crystalline structure, permeability of polyethylene 1 / 4 to 1 / 2, a high degree of transparency, bright and clean, processing high-performance, widely used in preparation of fibers, molding products, but mainly plastic film.

Currently, a hermetic and easy to heat a coating of polypropylene film and other films, cellophane, paper, aluminum foil, and other composites has been the mass production of composite materials, composite materials produced by PP containers can be used for beverage packaging.

Various PP have a common characteristic of electrostatic belt, in order to solve this problem, usually in the coating film will be anti-static agent or mixing antistatic agent in the film. In the film coating hermetic good Polyvinylidene Chloride type PP resin can increase the oxidation resistance of polyester (PET or PETP)

Crystallization of PET is a good, colorless and transparent, highly resilient material. The exterior glass, odorless, tasteless, non-toxic, flammable, burning at the edge of yellow with a blue flame, hermetic good.

PET expansion coefficient small, molding shrinkage rate is low and only 0.2 percent, one-tenth of the polyolefin, a small nylon and PVC, it manufactures size stability. The best mechanical strength, and the extent of its expansion similar to aluminum, polyethylene film for the intensity of nine times, polycarbonate and nylon, three times the impact strength is generally thin film of the three to five times. While the film has moisture and Bao-xiang performance.

While polyester with these merits, but its film prices more expensive, heat sealing difficulties with electrostatic easy, so rarely used alone, mostly using heat sealing of the common good resin coating made of composite films.

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