Method and apparatus for the thermal treatment of impregnated material webs

Abstract

A material web impregnated with a settable synthetic resin travels in vertical direction, from the bottom towards the top, through a first heat treatment zone where the solvent of the synthetic resin or plastic is evaporated and there occurs a chemical reaction. The tacky material web departing from the first heat or thermal treatment zone then passes through a cooling zone where it is cooled by means of a cooling medium to such a degree that it does not stick to the deflection or diverting rolls over which the material web subsequently is guided. After deflection of the material web the latter is moved in vertical direction downwardly through a second heat treatment zone where the chemical reaction proceeds. Prior to winding-up of the material web the latter is further cooled. Before the first deflection roll and between the first pair of deflection rolls and the second pair of deflection rolls there is arranged a respective blowing or blast nozzle which blows a cooling medium against the face of the material web which comes into contact with the deflecting rolls. Consequently, there is caused further cooling of the material web and there is still further reduced the danger of the web sticking at the deflection rolls. By incorporating a cooling zone between the first heat treatment zone and the deflection rolls the material web can be moved at greater velocities through the installation, without the danger that it sticks to the deflection rolls.

Dependencies are inferred from the claim text.