BOPP film is biaxially oriented polypropylene film. Plastic sheet production line www.handern.com
The production of BOPP film is that the melt of high molecular polypropylene is first made into sheet or thick film through a long and narrow die, and then stretched in two vertical directions (longitudinal and transverse) simultaneously or step by step in a special drawing machine at a certain temperature and set speed, and then the film is made by proper cooling or heat treatment or special processing (such as corona, coating, etc.).
classification
The commonly used BOPP films include: ordinary biaxially oriented polypropylene film, heat sealed biaxially oriented polypropylene film, cigarette packaging film, biaxially oriented polypropylene pearlescent film, biaxially oriented polypropylene metallized film, extinction film, etc.
advantage
BOPP film is a very important flexible packaging material. BOPP film is colorless, odorless, tasteless, non-toxic, and has high tensile strength, impact strength, rigidity, toughness and good transparency.
The surface energy of BOPP film is low, so corona treatment is needed before gluing or printing. After corona treatment, BOPP film has good printing adaptability, and can be printed by color registration to obtain beautiful appearance, so it is often used as the surface material of composite film.
Insufficient
BOPP film also has some disadvantages, such as easy to accumulate static electricity, no heat sealing and so on. In the high-speed production line, BOPP film is easy to produce static electricity, so it is necessary to install electrostatic eliminator. Plastic sheet production line www.handern.com
In order to obtain heat sealable BOPP film, heat sealable resin solution, such as PVDC latex, EVA latex, etc., can be coated on the surface of BOPP film after corona treatment. Solvent adhesive can also be coated. Heat sealable BOPP film can be produced by extrusion coating or coextrusion.
The film is widely used in the packaging of bread, clothes, shoes and socks, as well as the cover packaging of cigarettes and books. The initial tear strength of BOPP film increases after stretching, but the secondary tear strength is very low. Therefore, there should be no incision on both ends of BOPP film, otherwise BOPP film is easy to tear off during printing and laminating. BOPP coated with self-adhesive can produce sealing tape, which is a market with large amount of BOPP.
Production process
BOPP film can be produced by tube film method or flat film method. The properties of BOPP films obtained by different processing methods are also different. BOPP film produced by flat film method has higher tensile ratio (up to 8-10), so its strength is higher than that of tube film method, and its thickness uniformity is also better.
matters needing attention
In order to get better comprehensive performance, multi-layer composite method is usually used in the production process. BOPP can be compounded with a variety of different materials to meet the needs of special applications. For example, BOPP can be compounded with LDPE (CPP), PE, Pt, Po, PVA, etc. to obtain high gas resistance, moisture resistance, transparency, high and low temperature resistance, cooking and oil resistance. Different composite films can be applied to the packaging of oily food, delicious food, dry food, impregnated food, various steamed and cooked food, monosodium glutamate, pancake, New Year cake, etc. Plastic sheet production line www.handern.com
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