A Chinese film manufacturer has recently ordered a unique high-performance machine combination composed of a co-rotating twin-screw extruder and a flexible PlanetCalander
smoothing unit from KraussMaffei Berstorff of Hannover, Germany, for the production of high-quality low-shrinkage EVA film used in solar plants.
In the production of EVA film for solar modules, the film used to cover the highly sensitive silica slices and all electrical connections between the individual cells must exhibit precise embossing and extremely low shrinkage. In addition, excellent adhesion, long service life and outstanding optical features are indispensable to ensure high efficiency of the photovoltaic modules.
“The modular co-rotating twin-screw extruders of the ZE series, which can be perfectly adapted to given process applications are the key to high film quality. As the raw material is directly processed into the finished film without requiring repeated heating and cooling of the polymer, extremely gentle material treatment is ensured, which provides an additional plus in terms of film quality,” explained Dieter Ernst, Sales Manager for Film and Sheet Lines of KraussMaffei Berstorff. The flat sheet lines are designed for output rates of over 1,000kg/h and film widths of up to 2,000mm.
Another highlight of the new line is the flexible PlanetCalender with its unique adjustment mechanism, KraussMaffei Berstorff says. As the first and the third rolls can be adjusted relative to the second roll, the cooling conditions can be adapted to the material-specific cooling behavior. At the same time, the rolls ensure constant and precisely reproducible embossing on both film sides. Furthermore, the downstream temperature control unit compensates the shrinkage stress generated by the extrusion process to ensure film quality.
Source : www.adsalecprj.com