Since launching a unique system for the continuous PUR insulated pipe production in early 2010, German plastics machinery experts Krauss Maffei Extrusion have experienced a positive demand for the technology which can be used for a range of applications such as air-conditioning lines and supply lines for geothermal plants.
The most recent sale of this continuous foam insulated pipe extrusion technology was made to Technopark, a plastic pipe producer headquartered in St Petersburg Russia who manufactures a wide range of pipe products. This new continuous foam insulated pipe extrusion line will produce pipe for district heating systems by encasing media pipes, made of cross-linked polyethylene, with polyurethane foam insulation and a PE outer sheath.
Pipe made of PE-HD, PE-X, PE-RT or PB is produced on a conventional pipe extrusion line, where a barrier layer can also be applied. Currently the largest version of the system can be used to produce pipe with an outer diameter of 180mm and a media pipe diameter of 110mm.
The continuous pipe production process involves the media pipe coming off a conventional pipe extrusion line, which is then wound onto large steel drums ready for transfer to an unwinder, centered, passed through a retarder, and then fed into the continuous foam contouring unit together with the application of a PE outer sheath.
Advantages of this continuous foam insulated pipe extrusion technology include:
- faster and easier laying of pipes, as there are minimal risks of thermal bridges and leaks
- insulation layer with low thermal conductivity is ideal for applications where a temperature differential must be maintained between the flowing medium and the ambient temperature
- no length limits on the pipes being produced thanks to the unique PU mixing head which eliminates stoppages for cleaning and changing the mixing head
- significant energy savings due to the superior insulation properties of the continuous uniform insulation encased in a protective outer sheath.