Abstract: The invention concerns a filtering drum (1) for fibre suspensions in water, comprising a plurality of shaped bars (2; 11, 13) with mainly longitudinal development, arranged side by side in order to define a tubular structure having substantially circular cross section, with the inner lateral surface (4) covered by a plurality of slits (3) that create a filtering surface, two or more annular elements (15) coaxial with one another and spaced according to the longitudinal axis (X) defined by the tubular structure, coupled through contact outside the shaped bars (2; 11, 13), wherein the shaped bars (2; 11, 13) are arranged according to a helical pattern.

Abstract: The invention concerns a flotation cell (1; 30) for purifying fibrous suspensions through the dispersion of air microbubbles (22), comprising: a container (2; 31); feed pipes (4; 34) for conveying the suspension (3) into the container (2; 31); means (5; 35) for intercepting the purified suspension; means (6) for extracting the purified suspension; means (7) for discharging the foams created by the impurities contained in the suspension (3); rotary vanes (19; 36) arranged inside the container (2; 31). The cell (1; 30) comprises air dispersers (10; 32; 42) for generating air microbubbles (22) and dispersing them in the suspension (3), in each one of which it is possible to identify one rotor (11; 45) with axial flow associated with driving means (12; 47) and one duct (13; 40; 46) for conveying external air at the level of the rotor (11; 45).

Abstract: The invention is a filtering basket for fibres in water dispersion, comprising a plurality of profiled bars arranged side by side to define a tubular structure with the inner lateral surface provided with a plurality of longitudinal slots that define a filtering surface; two or more annular elements coaxial to one another and spaced from one another, coupled by interference outside the profiled bars. The profiled bars comprise a plurality of main bars, each one of which is provided with a shaped edge whose cross-section is in the form of a trapezium and has the long side facing towards the inside of the basket and a plurality of secondary bars, each one of which is provided with a shaped edge whose cross-section is curved, with the convex part facing towards the inside of the basket.

Abstract: A strainer for fibrous suspensions, having a container, a filtering basket inside the container and a rotor inside the filtering basket coupled to motorization means suited to set it rotating. In the container there are a drain chamber of the rejected suspension, a delivery chamber of the filtered suspension, and a collector body arranged in the upper part of the container. The collector body has a lower collector and an upper collector, both with radial longitudinal profile in the shape of a truncated cone and connected to each other in correspondence with the long bases. The lower collector has its short base facing the filtering basket and the upper collector has its short base facing upwards.

Abstract: The present invention concerns a reactor for removing impurities from a liquid, in particular for de-inking, including a tank (1) within which the liquid to be purified together with a gas or air is introduced (2-3); a drain of the purified accepted through an outlet (7) of said tank (1); inlets (8-11, 9-12, 10-13) at different heights of the tank (1) connected to said purified liquid outlet (7) together with the inlet of gas or air; a rotating shaft (18) inside the tank (1) carrying blades (20, 21, 22, 23) at the different heights of the tank within which the liquid together with gas or air is introduced; the blades (20, 21, 22, 23) have progressively increasing heights when moving towards the lower portion of the tank (1). The invention also concerns the method embodied by the above-described reactor.

Abstract: The present invention concerns a reactor for removing impurities from a liquid, in particular for de-inking, including a tank (1) within which the liquid to be purified together with a gas or air is introduced (2-3); a drain of the purified accepted through an outlet (7) of said tank (1); inlets (8-11, 9-12, 10-13) at different heights of the tank (1) connected to said purified liquid outlet (7) together with the inlet of gas or air; a rotating shaft (18) inside the tank (1) carrying blades (20, 21, 22, 23) at the different heights of the tank within which the liquid together with gas or air is introduced.; the blades (20, 21, 22, 23) have progressively increasing heights when moving towards the lower portion of the tank (1). The invention also concerns the method embodied by the above-described reactor.

Abstract: The gearcase for transmitting motion with different speeds to at least two driving shafts in self-propelled farm machines forms two contiguous chambers and has a driving shaft. A main driving shaft enters a first chamber, and has a head which extends into a second chamber for transmission meshing with a driven shaft. Another driven shaft is provided with a set of speed-shifting gears, is arranged below and parallel to the main driving shaft and transmits motion to a third driven shaft accommodated in a housing lying below the first chamber.

Abstract: This invention is concerned with a head box in paper machines, including substantially an upper lip, a lower lip, a fibrous slurry flow straightening member connected to a given number of micrometrical control devices which micrometrically adjust the linearity of the flow straightening member, and a mechanism which can be driven by a manually actuated handwheel and which is connected to a hollow beam made integral with the micrometrical control devices whose control rods are supported by said hollow beam, whereby as the mechanism handwheel is actuated, the flow straightening member is subjected to displacements of a given amplitude along a wall adjacent to the upper lip, so that said flow straightening member is made to adjustably project relative to the wall of an amount ranging for instance from 5 to 15 mm, in order to modify the fibrous slurry turbulence.

Abstract: The angle drive transmission unit comprises a box-like housing defining first and second chambers in communication with each other and accommodating respectively an input shaft and an output shaft perpendicular to each other and carrying respectively first and second bevel gears in mutual mesh engagement. A peculiar feature of the invention is that the bearing associated with the inward end of the input shaft is carried in a seat defined by a closure cover of the box-like housing and detachably affixed to the box-like housing through elastically deformable means.