FIELD: chemical industry; other industries; production of the pipes made out of the foamed plastic used for heat-insulation of the pipelines.
SUBSTANCE: the invention is pertaining to the heat-insulation of the pipelines. The pipe made out of the foamed plastic and used as the heat insulation of the pipelines has external and internal surfaces. The internal surface is coated with the additional layer of the connected with it by the adhesive fibers. The fibers are manufactured out of the material with the melting point exceeding the melting point of the foamed plastic. The free ends of the fibers fixed to the internal surface of the pipe are spaced from the sticky layer by the distance equal to the length of the fibers. The fibers uniformly distributed on the internal surface of the pipe and cover from 2 up to 20 % of its internal surface. The linear density of the fibers makes from 0.5 up to 25 decitex, and the length - from 0.2 up to 5 mm. The invention also concerns the method of the continuous manufacture of the pipe out of the foamed plastic for the heat-insulation of pipelines. The pipe manufactured out of the foamed plastic with such additional layer of the fibers has the higher heat-resistance and the lower thermal conductivity in comparison with ordinary insulation pipes made out of the foam plastic.
EFFECT: the invention ensures, that the pipe manufactured out of the foamed plastic with such additional layer of the fibers has the higher heat-resistance, the lower thermal conductivity in comparison with ordinary insulation pipes made out of the foam plastic.
4 cl, 3 dwg
