Patent DE-102007000708-A1 (DE)
Title: Device for degassing fluid/pasty medium such as coating color for coating paper web/cardboard, comprises low pressure chamber in which low pressure is generatable, and inlet arrangement, which guides the medium in the low pressure chamber
Inventor: STELLNER BERND-UWE
IPC: B01D19/00
Filed: 2007-09-07
Abstract: The device for degassing a fluid or pasty medium such as coating color for coating paper web or cardboard, comprises a low pressure chamber (16) in which a low pressure is generatable, an inlet arrangement (12, 36), which guides the medium in the low pressure chamber, an outlet arrangement (34), which discharges the medium from the low pressure chamber, a centrifugal plate (24a, 24b) arranged in the low pressure chamber, a separating device, a tempering arrangement for controlling/regularizing the temperature of the section of the device. The device for degassing a fluid or pasty medium such as coating color for coating paper web or cardboard, comprises a low pressure chamber (16) in which a low pressure is generatable, an inlet arrangement (12, 36), which guides the medium in the low pressure chamber, an outlet arrangement (34), which discharges the medium from the low pressure chamber, a centrifugal plate (24a, 24b) arranged in the low pressure chamber, a separating device, a tempering arrangement for controlling/regularizing the temperature of the section of the device. The medium is guidable on the centrifugal plate in the low pressure chamber. The centrifugal plate or its edge is drivable for the rotation around a vertical rotation axis. The centrifugal plate is implemented with sieve edges (42a, 42b). The medium is centrifuged in a continuous medium flow over the vertical area from the centrifugal plate. The centrifugal plate is vertically arranged in a radially external edge area to plan a vertically expanded outline area for removing the medium from the centrifugal plate. The medium splitted in separate medium flows is centrifuged by the centrifugal plate. The centrifugal plate is shifted in different defined vertical plains or vertical part areas. The centrifugal plate comprises tear-off edges or tear-off areas shifted to each other against in vertical direction in a radially external edge area. The tear-off edges and/or the tear-off areas define the vertical plains and/or vertical areas. The medium brought to the centrifugal plate is proratable to the tear-off edges and/or tear-off area by the separating device. The separating device comprises a separating plate that defines a vertical outlet for discharging the medium towards bottom and a discharging area for diverting the medium towards radial external to the tear-off edges and/or to the tear-off areas. Vertical passages and discharge surfaces are intended in circumferential direction. The medium is centrifuged through the rotation against a stationary impact surface arrangement. The separate media flow or partial flow is assigned to a centrifuged media flow of the separate impact surface arrangement. The medium is discharged towards bottom from an upper impact arrangement independent of a lower impact arrangement. The inlet arrangement delivers the medium around a centre of upper centrifugal plate or stationary centrifugal plate. The inlet arrangement has delivery openings arranged around the centre. The delivery opening delivers the medium simultaneously on the surface of the upper centrifugal plate and/or distribution plate. The delivery opening has beam widening outlet geometry for discharging fan- and/or funnel shaped beams of the medium. The supply openings are formed by fan jet nozzles, tongue nozzles, blade nozzles, watering can head nozzle or atomization nozzle. The centrifugal plates are arranged vertical to each other. The tempering arrangement heats a collecting section of the device in which the medium delivered by the centrifugal plate collects. The tempering arrangement cools a section of the inlet arrangement, a section of the device arranged in flow direction of the medium upstream of the inlet arrangement or a section of a wall surrounding the low pressure chamber. A drive unit is coolable for rotatably driving the centrifugal plate or its edges by a rotating shaft and/or a swivel of the rotating shaft and/or the rotating shaft areawisely by the tempering arrangement. The medium guidable with interacting elements in the interior of the low pressure chamber is temperable through the tempering device. The device is operatable with a pressure in the interior of the low pressure chamber less than a loading vapor pressure of the medium. The medium comprises a binding agent and a pigment and has a solid material content of 50-80 wt.% and/or a viscosity of 700-4000 mPas. Independent claims are included for: (1) a coating device; and (2) method for degassing a fluid or pasty medium such as coating color for coating of paper web or cardboard.