Reifenhäuser: Cast Film Lines for Thin PP Films

This month the third film line with 4.6 m die for the production of PP was delivered to China, which was required for the multiple requirements of food packaging. Compared to the usual film lines with width of 2–3 m, these larger lines have certain special requirements in respect to engineering and processing technology. has drawn on its many years of experience of know-how in the building of cast film lines to design lines for three-layer polypropylene films in widths up to 4.8 m, that guarantee quality film. Lines for the production of three-layer PP cast films have three extruders: one extruder of 180 mm screw diameter and two coextruders of 90 mm screw diameter. Slot dies with widths up to 4600 mm have, due to their coat hanger channels, optimum melt flow and automatic control of film thickness. Using the patented coextrusion adapter REIcofeed three-layer PP films in thicknesses of 20–120 microns can be produced. The casting unit, with main chill rolls of 800 or 1000 mm, can be adjusted in height and moved in operating direction, and guarantees high film quality with its even roll surface temperature distribution (± 1°C). Film thickness gauge, oscillation, pre-treater and post-cooling rolls, are integrated into the haul-off unit. Finally, tried and tested winding technology is installed. Output of these lines is up to 1450 kg/h gross at speeds of 230 m/min.

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