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Packaging dedicated CPP

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Special CPP film for food packaging

CPP is the plastic industry cast extrusion process through the production of polypropylene (PP) film. Such films and BOPP (bi-directional polypropylene) film in different, non-oriented film. Strictly speaking, CPP film only in the longitudinal (MD) direction there is some direction, mainly due to the nature of due process. Chill cast roll by rapid cooling, excellent in the film formed on the clarity and smoothness.

CPP film main features include:

- And LLDPE, LDPE, HDPE, PET, PVG compared to other films, lower cost, higher yields.
- Higher than the PE film stiffness.
- Water quality gas and odor barrier.
- Multi-functional, composite materials can be used as the base film.
- Can be metal processing.
- As a food and commodity packaging and packaging, with excellent demonstration of the product can still clearly visible under the package.

    While some cast PP film by the production process, for the health sector or as fillers and other additives including synthetic paper, but the term usually refers to the CPP film for lamination, metallization, and packaging applications such as high-definition films .

Current uses and potential uses

    CPP's current uses include: apparel, knitwear and flower bags; pouch; packaging; files and albums films; food packaging; and for barrier packaging and decoration of the metal film.

    Potential uses include: blister packaging (instead of PVC); food packaging; candy packaging (twist); Pharmaceutical Packaging (infusion bag); in albums, folders and files and other fields instead of PVG; synthetic paper; adhesive tape ; reports cover; contacts; ring folder and stand bags composite materials.

CPP film is so attractive because of low cost, and PET, LLDPE, LDPE and other materials, compared with a price advantage. LLDPE, compared with 5% to 10% plus 2% spread is the difference between the density of attractions. Furthermore, the cast film intrinsic nature of the rapid cooling, can form a superior finish and transparency. Requirements of packaging for high-definition purposes, this feature allows the PP film as the preferred material. It provides a transparent window to make the contents clearly visible, especially for the flexible packaging market. By corona treatment, ease of use of various techniques for printing. This feature can improve the film's final appearance.

    CPP excellent heat resistance. The softening point of PP is about 140 ℃, such films can be used in hot filling, cooking bags, aseptic packaging and other fields. With acid and alkali resistance, excellent performance grease, making bread or laminated packaging material of choice for the field of materials. The food contact safety, presentation, excellent performance, will not affect the flavor of the food contents, and can select different grades of resin to obtain the desired characteristics.
Market size

    It GMAI estimated 2001 global demand was 135.7 million tons of thermoplastics, PP accounted for 22% of the total volume of the polymer. Western Europe, North America and Asia are the major consumers of polypropylene, accounting for 78% of total global demand. Among them, only Japan, Southeast Asia, China and South Korea accounted for the total global demand for PP 39%.

     According to the U.S. market research firm Freedonia Group predicts by 2002, the United States about the total demand for PP films, the average annual growth rate of 4.5%, reaching 671,500 tons. However, most of the film is BOPP film. The demand for food packaging is expected to account for 85%. In the United States, CPP less than other parts of popular films, but recently Ji began to expand the use of laminated materials in the field. According to Borealis figures show that Western European PP market is expected to reach 8.1 million tons. CPP film market size in 2003 is expected to reach 423,000 tons, the main application areas are laminated materials and food packaging.

PP thin film cast, especially the metal grades, the food packaging market in Asia a strong competitive advantage. For example, Japan in 1997 the amount of up to 120,000 tons of CPP film.

In Latin America, GPP films began to be affected by market Green Mi, more and more widely. According to Freedonia Group predicted that up to 400,000 tons of PP packaging around.

For the future, CPP film development trends will be:

- Market share growth, PVC, PS and PE thus resulting in reduced market share;
- In demanding applications, extensive use of co-extruded structure;
- Improved sealing properties;
- Fouling and other processing problems are resolved;
- Film production, auxiliary operations and end-use areas such as production efficiency;
- Metal adhesion enhancement;
-PP in the dessert, salad, frozen food cap, jam, snacks, candy pouch, peel structure, kink film and other non-traditional market, increase market share;
- Bread, biscuits, pasta products, snacks and other less demanding packaging as a low-cost options, instead of BOPP film.

Production equipment

    CPP film production equipment can be single-layer cast extrusion lines, may also have a more complete 3-layer flexible production lines. Equipment types and specifications of products produced by the expected end-use decisions and film.

     Small single-line investment, suitable for flower production and use of packaging film, lamination film and adhesive film. Co-extrusion line has excellent flexibility, combined with the production of homopolymer and copolymer PP-class structure of the material. For co-extrusion line is, there are two options: The combination of the two extrusion machines, capable of producing ABA structure, but there are some limitations; combination with three extrusion machines, producing a wider range, capable of producing single structure (AAA), or surface using the same materials (ABA) or different materials (ABC) co-extruded structures.

    For the production of CPP film, have a competitive advantage in the most modern production line are often involved in industry-standard 3-layer co-extrusion. Under normal circumstances, often with bulky structure layer can produce a large extrusion machine (100 mm or 150 mm) production core. Surface by small extruder (60 mm or 90 mm) feed, the process can get a good metal seal or performance better special effects.

    By co-extrusion technology is the result of this technology can mix different grades of PP, can improve the sealing characteristics. Higher prices only in the surface of the additive used to help reduce costs, and core materials can be used back. If the surface using special PP grades, can be laminated to improve performance, a small amount of its pinhole.

And GPE (cast polyethylene) film, compared, CPP film production requires higher and more complex. Therefore, the device configuration should be considered when the thickness of clarity and uniformity requirements. It can be said, is to ensure automatic die thickness of the key. However, the cold roll casting and casting equipment to ensure uniform cooling, to ensure the effect of automatically die. Successful design used to ensure the melt and the chill cast roll extract more closely between the contacts to produce higher-resolution film products.

     After corona treatment temperature must be controlled in order to transfer the base material, to avoid the formation of wrinkles and imperfections. Meanwhile, the volume must be properly designed machine, to ensure accurate roll material, or material shrinkage after aging, easy adhesion formation in multilayer films. CCP model membrane rolls through the air gap. Should also be used to send film roll for more precise control of roll hardness.

    Full automatic computer control die and to ensure uniform processing procedures, reducing the external variables on the impact of film quality. At the same time, using reasonable screw design, automatic temperature control, can more accurately control the melting of materials to prevent the formation of condensate particles in the film surface.
Processing equipment trends

     As the production process is very complicated, CPP can not be achieved in the production process and high-speed extrusion. Although significant improvement in recent years, won the Song, but with the stretch film compared to other products, the production rate is still low. Film quality is mainly determined by the optical properties and the number of condensate particles, therefore, must reduce speed, improve quality, to achieve better results. If the speed will shorten the cooling time, to allow more air into the folder between the film and chill cast rolls, which conflict with market expectations. To solve these problems, has been developed to soften boxes and vacuum boxes improved. Expediency, some manufacturers began to use the width of a larger production line to increase capacity and reduce scrap in the proportion of total output. Now, the production of 4.0 to 4.5 meters wide, CPP film production line of the main volume is not uncommon. Industry has been working to improve roll machine design, in order to accurately control the roll conditions to ensure membrane compliance.

CPP Extrusion Line main components include:

- Hybrid System
- Extruding machine (usually 3 sets)
- Automatic feed head and die
- Softening - Vacuum Dual Box
- Casting device
- Nuclear detector
- Treatment station
- Roll Machine
- Recovery System
- Integrated Control System

Materials and Thin Films

The development of new materials will continue to affect the CPP market to promote market growth. Prominent trends include:

1. Development of new PP grade.
2. Using new catalytic technology, the formation of different materials (developed by the Borealis and Basell), such as high crystalline PP, random copolymer multiphase, ultra-soft PP, high melt strength PP and so on.
3. Metallocene-based PP, of such materials from companies such as Exxon and Dow and development, processing of the fine, high definition, high stiffness, excellent sealing performance, extraction of low and volatile matter content is low.

    Exxon said, with the use of conventional Ziegler-Natta grade, compared with metallocene-based PP, in the high-speed machining easier to draft. CPP can also be produced by various combinations of film, and more generally the following structure:

A layer: CoPP (random copolymer PP)
B layer: PP homopolymer
C layer: CoPP (low sealing initiation temperature, smooth anti-adhesion agent and additives)

    Layers of different materials can be used (or homopolymer PP random copolymer PP), depending on the desired effect and the specific end uses. For example: If the film for metal processing, laminating, or cooking purposes, can be used the same formula but different grades.

   Metal film with excellent optical properties required for the 20 micron (1 mil) 3 layer co-extruded film, mist scale value can not exceed 2%. Laminated film and cooking classes for class film, mist degree values ??were 2.5% and 5%, but requires twice the sealing strength.

    Packaging used for candy twist film, the most important feature is the death fold and twist retention or memory. IV solution bags, and other 3-layer structure can be used for other purposes, of which the surface layer of high-crystalline grade should be used to ensure the heat resistance and moisture barrier; its core, use a soft grade PP, the other sealed surface can be high United of random copolymer PP.

    New PP grade and the technology industry has opened up broad areas of application, or even replace other traditional materials. (Barton Feier Ge Rust Engineering Co., Ltd.)


 

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