OPP, BOPP, CPP difference

intro

OPP film is a kind of polypropylene film, because the production process is multi-layer extrusion, it is called co-extrusion oriented polypropylene film (OPP). If there is a bidirectional stretching process in the processing, it is called bidirectional stretching oriented polypropylene film (BOPP). In contrast to the co-extrusion process, the other is called cast polypropylene film (CPP). The properties and uses of the three films are different.

OPP film

OPP: Oriented polypropylene (film), stretchable polypropylene, is a kind of polypropylene.

OPP tape: polypropylene film as the base material, with high tensile strength, light weight, non-toxic and tasteless, environmental protection, wide range of use and other advantages;

OPP bottle: Light weight, low cost, improved transparency, good heat resistance, suitable for hot filling.

OPP labels: Compared with paper labels, it has the advantages of transparency, high strength, moisture-proof, and not easy to fall off, although the cost has been increased, it can get a good label display and use effect. With the development of domestic printing process and coating technology, the production of self-adhesive film labels and printed film labels is no longer a problem, and it is foreseeable that the use of domestic OPP labels will continue to increase.

BOPP film

BOPP: bidirectional polypropylene film, also a kind of polypropylene.

Commonly used BOPP films include: ordinary biaxial polypropylene film, heat seal biaxial polypropylene film, cigarette packaging film, biaxial polypropylene pearlized film, biaxial polypropylene metallized film, dull film, etc.

Classification：

Ordinary BOPP film

BOPP heat sealing film

BOPP cigarette packaging film

BOPP pearl film

BOPP metallized film

BOPP extinction film and BOPP anti-fog film

BOPP film is a very important flexible packaging material, which is widely used. BOPP film 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, and corona treatment is required before gluing or printing. However, after corona treatment, BOPP film has good printing adaptability, and can obtain exquisite appearance effect by color printing, so it is commonly used as the surface material of composite film.

BOPP film also has shortcomings, such as easy to accumulate static electricity, no heat sealing and so on. In the high-speed production line, BOPP film is easy to generate static electricity, and an electrostatic remover is required. In order to obtain heat-sealable BOPP film, the surface of the BOPP film can be coated with heat-sealable resin adhesive after corona treatment, such as PVDC latex, EVA latex, etc., can also be coated with solvent adhesive, and can also be produced by extrusion coating or co-extrusion composite method.

CPP film

CPP: With good transparency, high gloss, good stiffness, good moisture resistance, excellent heat resistance, easy to heat seal and other characteristics.

CPP film is printed and bagged, suitable for: clothing, knitwear and flower bags; Film of documents and albums; Food packaging; And metallized film suitable for barrier packaging and decoration. Potential uses also include: food packaging, candy packaging (twist film), pharmaceutical packaging (infusion bag), in the fields of albums, folders and documents instead of PVC, synthetic paper, self-adhesive tape, name card holders, circular folders and standing bag composite materials.

CPP has excellent heat resistance. Since the softening point of PP is about 140℃, this kind of film can be used in hot filling, cooking bags, aseptic packaging and other fields. Coupled with excellent acid, alkali and grease resistance, it becomes the preferred material in the field of bread product packaging or laminating materials. It is safe in contact with food, has excellent presentation performance, does not affect the flavor of the internal food, and can choose different grades of resin to obtain the desired characteristics.

As described above, the casting film production process generally adopts the T-die method.

Compared with the tubular film method, the casting method eliminates the blowing stage, is simpler to operate, and produces less waste. Secondly, the orderly arrangement of chemical molecules makes the transparency, gloss and uniformity of the film improved, which is very suitable for advanced packaging. The casting part adopts electric up and down swing and forward and backward movement structure, which makes the operation more simple, and the corona part adopts air cooling and water cooling mode, which makes the product more difficult to deformation.

The advantages of casting film machine with high quality process requirements: high surface finish, mirror roller with hard chrome coating, roll core of 304 stainless steel, reliable quality. The whole machine is driven by servo motor, which runs smoothly and accurately. Each roll of the laboratory small multi-layer co-extruder is independently driven by servo motor and runs stably. Each roll speed ratio can be freely adjusted. Advanced multi-axis synchronization technology ensures that each roll speed is synchronized. Advanced PLC control and mobile touch screen operation ensure system stability and improve operation convenience. In addition, we offer gravity feeders with optional melt pumps, as well as laboratory miniature multi-layer co-extruded calenders and laboratory miniature multi-layer co-extruded laminating machines. In addition, we can also choose the MDO longitudinal tensile unit to form the laboratory small online cast film MDO tensile line.

Product Recommendation:

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