B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/777
B29C 47/02 (2006.01) B05D 7/14 (2006.01) B32B 1/08 (2006.01)
Patent
CA 1207117
ABSTRACT OF THE DISCLOSURE An improved method of jacketing steel pipes which is particularly applicable for jacketing pipes of a diameter of between 50 mm and 500 mm is provided having high jacketing speeds and high throughputs. The pipe is heated initially to a temperature at least sufficient to cause a subsequently applied epoxy resin-curing agent powder blend to melt; a coherent and uniform epoxy coating is desired which may require subsequent heating of the epoxy coating. The epoxy coating will cure at a temperature from 145 degrees Centigrade to 155 degrees Centigrade within 50 to 70 minutes and the layer thickness should be between 30 and 50 micrometers. Prior to applying the jacket, the thermally produced reaction products must escape. This is ensured by an infrared radiation step which raises the temperature to about 200 degrees Centigrade. In the case of a thermo-sensitive interior of the steel pipe, this heating step provides not only for the evaporation of reaction products, but simul- taneously ensures that the preheated and slightly melted powder obtains sufficient fluidity.
431867
Fetherstonhaugh & Co.
Mannesmann Aktiengesellschaft
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