| | In the Welex ® Evolution ® series, Graham Engineering Corporation has created a machine portfolio that provides robust, customizable sheet extrusion for wind- ing, sheeting and in-line thermoforming systems. The state-of-the-art systems operate with a co-extrusion process, where up to nine extruders can be included in the system, for example to manufacture multi-layer products. The applica- tion-specific machine configurations from Graham Engineering Corporation feature, among other things, high-performance screen changers, melt pumps, mixers and co-extrusion feed blocks. The XSL Navigator ® machine control platform, which was developed by Graham Engineering Corporation, provides efficient operation of the Welex sheet extru- sion machines. The basis of this control platform is

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