Method and apparatus for measuring the properties of a fiber or colloid suspension

Apparatus for measuring the properties of a fiber or colloid suspension for process control, comprising:

• an analyzer vessel defining a lower section and an upper section separated by a filter, the lower section of the vessel defining a sample inlet and the upper section of the vessel defining an air outlet;
• a first valve disposed in the sample inlet for sealing and emptying said lower section and for introducing a sample of suspension into the emptied lower section and for adjusting the rate of flow at which the sample of the suspension flows into the analyzer vessel;
• a second valve for regulating the rate of air which can be withdrawn from the upper section of the vessel;
• a device for measuring the rate at which the upper section of the analyzer vessel fills with a filtrate;
• and
• an outlet valve in the lower section of the analyzer vessel for removing a filtrate and a filter cake from the analyzer vessel by a stepwise negative pressure differential in the lower section wherein the outlet valve is constructed such that when it is opened it generates a negative pressure differential in the lower section of the analyzer vessel.

Apparatus for measuring the properties of a fiber or colloid suspension for process control, comprising:

• an analyzer vessel defining a lower section and an upper section separated by a filter, the lower section of the vessel defining a sample inlet and the upper section of the vessel defining an air outlet;
• a first valve disposed in the sample inlet for sealing and emptying said lower section and for introducing a sample of suspension into the emptied lower section and for adjusting the rate of flow at which the sample of the suspension flows into the analyzer vessel;
• a second valve for regulating the rate of air which can be withdrawn from the upper section of the vessel;
• a device for measuring the rate at which the upper section of the analyzer vessel fills with a filtrate;
• and
• an outlet valve in the lower section of the analyzer vessel for removing a filtrate and a filter cake from the analyzer vessel by a stepwise negative pressure differential produced in the lower section, wherein the outlet valve is constructed such that when it is opened it generates a negative pressure differential in the lower section of the analyzer vessel.

Apparatus for measuring the properties of a fiber or colloid suspension for process control comprising:

• an analyzer vessel defining a lower section and an upper section separated by a filter, the lower section of the vessel defining a sample inlet and the upper section of the vessel defining an air outlet;
• a first valve disposed in the sample inlet to permit adjustment of the rate of flow at which a sample of the suspension flows into the analyzer vessel;
• a second valve permitting regulation of the rate at which air can be withdrawn from the upper section of the vessel;
• at least one of
• (a) device for measuring the rate at which the upper section of the analyzer vessel fills with filtrate, and
• (b) polyelectrolyte measuring device for determining the polyelectrolyte content of the filtrate;
• and
• an outlet valve in the lower section of the analyzer vessel by way of which filtrate and filter cake can be removed from the analyzer vessel, said outlet valve is constructed such that when it is opened it generates a negative pressure differential in the lower section of the analyzer vessel.

Apparatus for measuring the properties of a fiber or colloid suspension for process control comprising:

• an analyzer vessel defining a lower section and an upper section separated by a filter, the lower section of the vessel defining a sample inlet and the upper section of the vessel defining an air outlet;
• a first valve disposed in the sample inlet to permit adjustment of the rate of flow at which a sample of the suspension flows into the analyzer vessel;
• a second valve permitting regulation of the rate at which air can be withdrawn from the upper section of the vessel;
• at least one of
• (a) device for measuring the rate at which the upper section of the analyzer vessel fills with filtrate, and
• (b) polyelectrolyte measuring device for determining the polyelectrolyte content of the filtrate;
• and
• an outlet valve in the lower section of the analyzer vessel by way of which filtrate and filter cake can be removed from the analyzer vessel, said outlet valve comprises a tube-constricting valve.

Apparatus for measuring the properties of a fiber or colloid suspension for process control comprising:

• an analyzer vessel defining a lower section and an upper section separated by a filter, the lower section of the vessel defining a sample inlet and the upper section of the vessel defining an air outlet;
• a first valve disposed in the sample inlet to permit adjustment of the rate of flow at which a sample of the suspension flows into the analyzer vessel;
• a second valve permitting regulation of the rate at which air can be withdrawn from the upper section of the vessel;
• and at least one of
• (a) device for measuring the rate at which the upper section of the analyzer vessel fills with filtrate, and
• (b) polyelectrolyte measuring device for determining the polyelectrolyte content of the filtrate;
• said first valve comprises a tube-constricting valve.