Oy Kwh Pipe Ab

Charlotta Risku

Stefan Slotte

Jonas Holmlund

Patrick Jansson

Mikael Finne

Abrasion resistant polymer pipe and a process for the production thereof. The pipe comprises a first, abrasion resistant inner layer () and a second, structural layer (), which is placed on the outer side of the inner layer. The first and the second layers comprise extrudable polymer materials and they are preferably separated by an alarm layer which indicates wear or depletion of the inner layer. The pipe is suitable for use in the mining industry and generally for conducting liquid and gaseous fluids containing abrasive particles.

Multiple layer pipe

The invention concerns a method for manufacturing pipes coated with a peelable protection layer, wherein the core pipe () is produced by extruding and calibrating, after which the surface of core pipe () is heated before a protecting coating layer () is applied onto the core pipe () on passing through a coating die (), followed by cooling the applied coating layer () before the readily coated pipe () is drawn out of the process. The method is characterized in that the degree of adhesion between core pipe () and coating layer () is controlled by rapid and effective heating of the surface of the core pipe () to a predetermined temperature and by controlling welding time and stretching of the coating layer being applied onto the core pipe () by maintaining a controlled vacuum level inside the coating die () forcing the coating layer to hit the surface of the core pipe at an angle as steep as possibly, preferably between 45 and 90 degrees, most preferably between 60 and 80 degrees.

Growing community of inventors

Vasa, Finland

Charlotta Risku