Medium consistency liquid mixture

An apparatus for mixing a liquid with a medium consistency pulp stock;

• the apparatus comprising:
• a housing having a substantially cylindrical section which defines a housing axis, the housing having an open end adjacent to the cylindrical section for receiving a flow of medium consistency paper pulp stock;
• a shaft extending along the housing axis and mounted for rotation to the housing;
• a rotor mounted to the shaft and along the housing axis the rotor having an unsupported end terminating in a head having a radially extending surface, the rotor having a first portion which extends along the housing axis inside the cylindrical section;
• a pipe having an outlet opposite the head radially extending surface to direct a stream of liquid onto the radially extending surface;
• a plurality of radially extending first vanes mounted to the first rotor portion, wherein when pulp stock is flowing through the cylindrical section and a stream of liquid is impinged on the radially extending surface the liquid is dispersed in the pulp stock and the radially extending first vanes mix the liquid and pulp stock together further comprising:
• a foraminous cylinder having an interior surface and being coaxial with the housing cylindrical section and adjoining the housing cylindrical section opposite the housing open end;
• a second portion of the rotor which extends along the housing axis and which is spaced radially inwardly from the foraminous cylinder;
• a plurality of radially extending second vanes mounted on the rotor second portion, the second vanes being closely spaced from the inner surface of the foraminous cylinder to generate a region of high shear in a flow of medium consistency paper pulp stock flowing from the open end and along the cylindrical section and through the foraminous cylindrical surface.

An apparatus for mixing a liquid with a medium consistency pulp stock comprising:

• a housing having a substantially cylindrical section which defines a housing axis, wherein the housing has an open end adjacent to the cylindrical section for receiving a flow of medium consistency paper pulp stock;
• a foraminous cylinder having an interior surface and being coaxial with the housing cylindrical section and adjoining the housing cylindrical section opposite the open end;
• a shaft extending along the housing axis and mounted to the housing for rotation;
• a rotor mounted on and coaxial with the shaft;
• a plurality of radially extending vanes mounted on a portion of the rotor which extends along the housing axis and radially inward of the foraminous cylinder, the vanes being closely spaced to the interior surface of the foraminous cylinder so as to generate a region of high shear in a flow of medium consistency paper pulp stock flowing from the open end and along the cylindrical section and through the foraminous cylinder surface;
• and
• a volute surrounding the foraminous cylinder and communicating with a pulp outlet.

An apparatus for mixing a liquid with a medium consistency pulp stock comprising:

• a housing having a substantially cylindrical section which defines a housing axis, wherein the housing has an open end adjacent to the cylindrical section for receiving a flow of medium consistency paper pulp stock;
• a foraminous cylinder having an interior surface and being coaxial with the housing cylindrical section and adjoining the housing cylindrical section opposite the open end;
• a shaft extending along the housing axis and mounted to the housing for rotation;
• a rotor mounted on and coaxial with the shaft;
• a plurality of radially extending vanes mounted on a first portion of the rotor which extends along the housing axis and radially inward of the foraminous cylinder, the vanes being closely spaced to the interior surface of the foraminous cylinder so as to generate a region of high shear in a flow of medium consistency paper pulp stock flowing from the open end and along the cylindrical section and through the foraminous cylinder surface;
• wherein the rotor terminates in a head defining a radially extending surface, the apparatus further comprising;
• a pipe having an outlet opposite the radially extending surface for directing a stream of liquid onto the radially extending surface;
• a second plurality of radially extending vanes mounted on a second portion of the rotor which extends along the axis of the cylindrical section the second portion being between the first portion of the rotor and the radially extending surface.

An apparatus for mixing a liquid with a medium consistency pulp stock comprising:

• a housing having a substantially cylindrical section which defines a housing axis, wherein the housing has an open end adjacent to the cylindrical section for receiving a flow of medium consistency paper pulp stock;
• a foraminous cylinder having an interior surface and being coaxial with the housing cylindrical section and adjoining the housing cylindrical section opposite the open end;
• a shaft extending along the housing axis and mounted to the housing for rotation;
• a rotor mounted on and coaxial with the shaft;
• and
• a plurality of radially extending vanes mounted on a portion of the rotor which extends along the housing axis and radially inward of the foraminous cylinder, the vanes being closely spaced to the interior surface of the foraminous cylinder so as to generate a region of high shear in a flow of medium consistency paper pulp stock flowing from the open end and along the cylindrical section and through the foraminous cylinder surface, wherein the portion of the rotor which extends along the housing axis and along the foraminous cylinder has a frustoconical shape which increases in diameter away from the open end of the housing.

An apparatus for mixing a liquid with a medium consistency pulp stock;

• the apparatus comprising:
• a housing having portions defining a substantially cylindrical chamber with a housing axis;
• a pipe section which discharges medium consistency pulp stock into the housing cylindrical chamber along the housing axis;
• a rotor positioned within the cylindrical chamber and extending along the housing axis and rotatable about the housing axis;
• portions of the rotor defining a head which has surfaces which extend substantially perpendicular to the housing axis;
• a pipe which discharges a liquid in the direction of the housing axis toward the rotor head, where the discharged liquid is dispersed radially by the rotating rotor head to form a mixture of liquid and pulp stock;
• a plurality of radially extending vanes mounted on the rotor;
• portions of the housing which define an outlet downstream of the rotor head;
• and
• a screen positioned over the outlet, such that the mixture of liquid and pulp stock passes through the screen on leaving the cylindrical chamber and is further mixed thereby.