Krauss Maffei Extrusion of Munich, Germany have developed an innovative line concept for the production of 2-component window profiles made of PP and TPE-V. The line comprises of two or three single-screw extruders of different sizes which form the core elements of the co-extrusion line designed for optimum material melting and homogenizing.
The first line of this type, being used for the production of high-quality window profiles for the new VW Golf VI, has already been successfully commissioned at the customer’s premises. The profiles are composed of a polypropylene profile clamping element, TPE-V sealing lips and a flock tape laminated onto the lips after the discharge from the extrusion die. The key benefits offered by two-component profiles are easy recycling, low part weight and reduced production cost.
For this new market, Krauss Maffei deliver systems with two or three extruders of different sizes, including extrusion dies as well as all downstream equipment including calibration cooling section, caterpillar take-off and cutting machine with stacking unit for the cut profile.
The co-extrusion line features a typical V-type extruder arrangement. The primary extruder designed as a TE 90 with a processing section length of 30D – is used for processing the PP material. The additional single-screw extruder TE 75 and 45, with processing lengths of 28 to 30D each, deliver the extruded TPE-V at an angle of 45 degrees to the PP material. Depending on the material processed, the line achieves a production speed of up to 15 to 20m/min.