| 摘要 |
A spreader roll supported at the middle thereof for a wire or felt in a paper machine, comprising a metallic inner tube and an outer tube attached onto the inner tube through an intermediate part, the intermediate part being substantially symmetric relative to a transverse center plane of the roll. The inner tube and the outer tube are substantially coaxial with one another when the roll is in an unbent state, with annular intermediate spaces situated between the tubes at both sides of the intermediate part, such intermediate spaces being dimensioned to permit deflection of the inner tube and the outer tube in different directions relative to one another by the effect of tensioning force of the fabric arranged to run over the roll. Ends or flanges can be attached to outer ends of the inner tube, while axle journals can be attached to these ends or flanges, by means of which the roll can be journaled to revolve. The double mantle of the roll and its intermediate part thereof are composed of a metallic inner tube, preferably made of steel, and an outer tube and intermediate part both made of reinforced plastic. The intermediate part is made of a single joint-free piece of reinforcement plastic together with the outer tube, and is manufactured onto a middle portion of the inner tube. |
