초록 ▼

A belt on drum-type press which provides for utilization of a maximum amount of the drum circumference and provides a wide latitude of choice in the relationship between belt tension and press roll nip forces on the drum. In the preferred embodiments the press has a central drum free of axial bendin

A belt on drum-type press which provides for utilization of a maximum amount of the drum circumference and provides a wide latitude of choice in the relationship between belt tension and press roll nip forces on the drum. In the preferred embodiments the press has a central drum free of axial bending moments and stresses.

대표청구항 ▼

A drum and belt-type press for compressing a moving web or mat which comprises: (a) a supporting frame; (b) first and second spaced apart rotatable nip rolls mounted on the frame, said rolls having parallel axes of rotation, the first roll positioned as a belt entry nip roll and the second roll posi

A drum and belt-type press for compressing a moving web or mat which comprises: (a) a supporting frame; (b) first and second spaced apart rotatable nip rolls mounted on the frame, said rolls having parallel axes of rotation, the first roll positioned as a belt entry nip roll and the second roll positioned as a belt exit nip roll; (c) a central drum adjacent the first and second nip rolls, the drum having an axis of rotation essentially parallel to said nip rolls; (d) at least one idler nip roll having limited freedom of movement generally radial to the drum also being located adjacent the drum; (e) an endless flexible belt having an inner generally U-shaped course and an outer generally U-shaped course, the inner and outer courses meeting in loops, one loop containing the first nip roll and the other loop containing the second nip roll, the inner course of the belt being wrapped around more than one half of the circumference of the drum, said first and second nip rolls being located within the body of the belt, said idler nip roll or rolls also being located within the body of the belt, between the first and second nip rolls, all of the nip rolls making nip contact with the drum through the interposed inner course of the belt (f) at least one belt guide roll located within the body of the belt to support the outer course of the belt, said guide roll or rolls not making nip contact with the drum, the location and sizes of the guide roll or rolls and the nip rolls acting to maintain clearance between the outer course of the belt and the inner course of the belt; (g) tensioning means to control belt tension; (h) supplemental loading means for one or more of said idler nip roll or rolls, to create a desired nip force for said idler nip roll or rolls acting upon the drum, independent of belt tension, the location of all said idler nip rolls and the nature of the forces they exert on the drum being such and the press being constructed and arranged such that the net resultant force of all idler nip roll forces upon the drum is directed between the centers of rotation of the first and second nip rolls; and (i) driving means for rotating the belt through its endless path so as to compress a web or mat interposed between the moving belt and drum, the drum being structured and arranged to have freedom to move radially toward or away from the first and second nip rolls so that the drum presses upon the first and second nip rolls with a force controlled by belt tension and the net resultant force of the idler nip roll forces.