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 Wysłany: Nie 2:41, 08 Maj 2011 Temat postu: franklin and marshall clothing A strong competitiv |
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A strong competitive advantage in the food packaging market, the CPP film
Which the surface layer of high crystallinity grade should be used to ensure the heat resistance and moisture barrier; its core, use a soft grade PP, the other sealing surface can be highly random copolymer of PP. New PP grade and the technology industry has opened up broad areas of application, or even replace other traditional materials. CPP film production equipment, production equipment can be simple single-layer cast extrusion lines, may also have a more complete 3-layer flexible production lines. Equipment types and specifications of products by the expected end-use decisions and film. Single line of investment smaller, 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,[link widoczny dla zalogowanych], 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 (4 inches or 6N-inch @ C100 mm or 150 mm) production core. Surface by small extruder (2.5 inch or 3.5 inch @ C60 mm 90 mm) feed,[link widoczny dla zalogowanych], the process can be obtained in the metal sealing characteristics or performance better special effects. CPP Extrusion Line main components: extruder hybrid system (usually 3 sets) for automatic feed head and the softening of a vacuum die casting device of dual-use nuclear case processing station analyzer system integrated into the paper recycling machine extrusion control system technical reasons can mix different grades of PP. Can improve the sealing characteristics. Higher prices in the surface using only additive,[link widoczny dla zalogowanych], can reduce costs. Core material can be reused. Surface using special PP grades, can improve the laminate performance. Pinhole is small. And CPE (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 automatic mode head is the only way to ensure uniform thickness. However,[link widoczny dla zalogowanych], if the cold-roll casting and casting plastic devices can not ensure uniform cooling effect, the results achieved automatically die will undo all our efforts. Membrane fouling and fouling on the impact of different resolution, mainly on cold-cast roll temperature settings and other parameters set. Uneven thickness will be very minor roll in the chill cast to form India and bumps, so that is no longer available. Needle grasping device design, softening tank design and specifications and other factors will be a tremendous impact on the film quality. Successful design used to ensure the melt and the chill cast roll extract more closely between the contacts to produce higher-resolution film products, high-speed production is no exception. After corona treatment the 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 material in rolls or, material shrinkage after aging, easy adhesion formation in the multi-layer film or print spread. CCP through the air gap membrane model rolls. The amount of air from the Should also be used to send film rolls to more precisely control the roll hardness. Automatic die head and a comprehensive computer-controlled production process, including material handling and measurement to ensure uniform processing procedures to reduce plastic packaging external variables impact on the film quality. At the same time, using reasonable screw design, through computer control of temperature, the material can be more accurately control the melt, to avoid the formation of condensate particles in the film surface. Processing equipment, production process is very complicated because trends, CPP can not be achieved in the production process and high-speed extrusion. Although in recent years to improve access to appropriate, however, and compared to other products such as stretch film, the production rate is still low. Film quality is mainly determined by the optical properties and the condensate particle counts, therefore, must reduce speed,[link widoczny dla zalogowanych], 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. However, this conflicts with market expectations. To solve these problems, has been developed improved software box and vacuum box. Expediency, some manufacturers began to use the width of a larger production line to increase capacity and reduce the scrap generated in the proportion of total output. Now, the production of 160-180 inches (4.0-4.5 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.
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