Abstract: The present invention serves for loading a pulp suspension (S) with calcium carbonate. Liquid calcium hydroxide as milk of lime (7) is added during or before the pulp operation (1) carried out to form the pulp. By introducing gaseous carbon dioxide (8) into the pulp suspension thus treated, a chemical reaction is triggered therein, in which the finely divided calcium carbonate is precipitated. The present invention is particularly economic and effective due to the early addition of calcium oxide or calcium hydroxide.

Abstract: Method for loading a fibrous stock suspension which contains cellulose fibers with calcium carbonate, comprising the following process steps: Adding calcium hydroxide in liquid or dry form, or calcium oxide into the fibrous stock suspension, Adding of gaseous carbon dioxide into the fibrous stock suspension, Precipitation of calcium carbonate through the carbon dioxide and Refining of the fibrous stock suspension during the loading process and washing of the fibrous stock suspension after the crystallizing process and/or the refining process and/or during the refining process and/or after the refining process.

Abstract: The invention relates to a device for the application of a liquid medium onto at least one side of a moving material web, specifically a cardboard web, including at least one roll and at least one feed device for the coating medium, whereby during operation of the device a liquid sump forms between the roll and the web. Nozzle lips of a nozzle body of the feed device are configured so that the desired dimension of the open surface of the liquid sump and the depth of immersion of the nozzle lips into the liquid sump, and thereby the level of the liquid sump are adjustable. The nozzle lips are surrounded up to 80% of their total length by the liquid sump.

Abstract: Process and apparatus for slushing contaminated recovered paper in a slushing device including a rotatable drum having first and second face on axial ends and at least one displacement body having an outside wall curved at least in sections located inside drum and held from outside of the drum to form processing channel between at least curved section of outside wall of displacement body and at least a part of an inside wall of drum to mechanically process the recovered paper. Process includes feeding recovered paper with impurities into drum on first face, moving recovered paper and impurities within drum from first to second face, and transporting recovered paper and impurities out of drum at second face together via a rotating coil. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Abstract: The invention relates to a device for the application of a liquid medium onto at least one side of a moving material web, specifically a cardboard web; comprising at least one roll (1; 1a) that supports the web (3) and at least one feed device (5; 5a) for the coating medium, whereby during operation of the device a liquid sump (6; 6a) forms between the roll (1; 1a) and the web (3). According to the invention, the nozzle lips (13, 14; 13a, 14a) of a nozzle body (12, 12a) of the feed device (5, 5a) are configured so that the desired dimension of the open surface of the sump (6, 6a) and the depth of immersion of the nozzle lips (13, 14; 13a, 14a), and thereby the level (P) of the sump (6, 6a) are adjustable. The nozzle lips are surrounded to 80% of their total length—starting from the nozzle opening (15, 15a)—by the sump (6, 6a).

Abstract: Process and apparatus for applying a liquid or pasty application medium on a traveling material web. The process comprises forming a material web in a wet end of a web production machine, and applying, via at least one application device in the wet end, at least one application medium on at least one side of the material web. The at least one application medium includes at least one organic material. The apparatus includes at least one application device located in a wet end of the web production machine, which is structured and arranged on at least one side of the material web, and at least one feeding pipe coupled to the at least one application device, which is structured and arranged for introducing at least one application medium includes at least one organic material.

Abstract: In a flotation system, the generated quantity of foam is determined and, independent thereof, process parameters which directly or indirectly affect the generated foam quantity are reduced in their quantity depending on foam quantity. This is brought about by reduction of specific substance flows and also such substance flows that circulate in a flotation system. Production waters used for dilution are partly replaced by fresh water. This precludes an excessive amount of generated foam from causing difficulties in the operation of a flotation system.

Abstract: A method and apparatus for decomposing waste paper in a storage tank (tower) under the effect of chemicals with a high stock concentration (high-consistency stock method), including the rotation of the paper pulp together with dilution and a vigorous extensive disintegration of the waste paper or rags by a slushing rotor in the lowest part of the storage tank (tower).

Abstract: The process for cleaning fibrous suspension in a multi-stage cleaner plant, in which one part is led off from the first stage as accept and the remaining part of the first stage is further prepared in subsequent stages. The cleaners (1) of the first stage (S1) serve to prepare three fractions including the accept fraction, and an accept content of at most between 35% and 45% is removed from these cleaners. In this way, the number of cleaners. In this way, the number of cleaners in the process can be reduced.

Abstract: Fibrous stock suspension preparation systems include moving parts that generate a vibration impulse flow in the outlet from the preparation system. A counter-vibration impulse generator is connected to the outlet pipe and includes a correcting impulse recorder also connected to the outlet pipe for sensing the vibrations of the flow therepast and for sending a signal to the counter-vibration generator to control the amplitude and/or the frequency of the counter-vibration generator. A further impulse recorder between the stock suspension preparation system and the first mentioned impulse recorder is also connected to the outlet pipe for providing a stock transit time correction signal for correcting the signal of the first mentioned impulse recorder.

Abstract: A flotation tank which is elongate and is divided along its length into individual compartments. Injectors (2) for each compartment are connected laterally to the tank (1) approximately 30 cm to 50 cm below the surface of the suspension so that the suspension flows out in a forward direction towards the outlet end and scum removal trough (3) of the flotation tank (1). The injectors are preferably connected both at their inlet side and their outlet side to the same compartment. The removal of scum is preferably effected by means of cyclones which are provided in a vertical arrangement at the outlet end of the flotation tank.

Abstract: The disclosure concerns a method and apparatus for producing a suspension of fibrous material from waste-paper. Following dissolving the waste-paper, cleaning the dissolved suspension and stain removal, the suspension is floated in series of flotation cells. The suspension is first floated through a first series of flotation cells. Thinning liquid medium, such as water, is added to the suspension. It is then floated through a second series of flotation cells. In one embodiment, the cells of the second series are larger than the cells of the first series. Following the second series of cells, the material floated from the second cells is delivered to another cell. In another embodiment, the cells of the second series are themselves divided into two separate rows of cells and the suspension is divided among the rows of second cells. In this embodiment, following flotation through the second cells, the material floated from the second cells is next delivered to joint secondary cells.

Abstract: Papers containing dye substances in microencapsulated form are reprocessed by dissolving the papers in a pulper in the presence of chemical collectors and/or dispersing agents and in a neutral pH range and then feeding the dissolved pulp to the flotation or washing zone for the addition of a bleaching agent.

Abstract: The disclosure concerns a process and an apparatus for recovering fiber suspension from a mixture of different types of waste paper. The waste paper is disintegrated in a pulper to form a fiber suspension comprised of individual fibers. After perhaps passing a presorting device, the fiber suspension passes through a sorting device which separates the fibers into a long-fiber fraction and a short-fiber fraction. The two fractions are subsequently treated in different ways, generally for the purpose of cleaning the fiber fractions. Various treatment techniques are disclosed, including separating impurities from the long-fiber fraction by flotation and/or bleaching the long-fiber fraction and washing the short-fiber fraction and/or treating it by flotation for de-inking the short-fiber fraction and perhaps thereafter sorting the short-fiber fraction to remove impurities.

Abstract: Waste paper is chemically and mechanically treated to pulp it into a stock. The waste paper is tumbled, without mechanical beating and without rotary means likely to become fouled by foreign material mixed with the paper. A chemical pulping liquid is mixed with the paper as it is being tumbled. The resulting tumbled, pulped waste paper is delivered to a reaction tower where it is further chemically pulped. The waste paper is removed from the bottom of the reaction tower. Various embodiments of paper tumbling devices are disclosed including a rotating drum, stepped conveyor belts, stepped rollers, a vibratory conveyor and a tumbling tower with baffle plates along its length. The reaction tower has an adjustable sized outlet opening at its bottom. An appropriate conveyor is insertable through the outlet opening of the reaction tower for extracting pulped paper stock.

Abstract: The invention concerns a flotation apparatus for separating impurities, such as printing ink, or the like, from a fiber suspension that has been formed from waste paper. The apparatus includes a container for flotation of the suspension. A drive shaft extends into the container, either from above or below. A feed opening for suspension is defined at the bottom of the container. On the drive shaft is a pump impeller for impelling suspension into the container and downstream along the drive shaft. From the pump impeller there is a rotor located on the drive shaft for dispersing air that is introduced to the container by an air feed conduit which emits air into the region of the rotor. The drive shaft itself may serve as the air feed conduit and it may have air outlets at either or both of the pump impeller and the rotor. A foam withdrawal means for withdrawing the foam of impurities generated in the flotation apparatus has an inlet positioned at the axis of the cylinder which is at the axis of the rotor.

Abstract: Water used in the treatment of waste paper is now commonly re-cycled. Hard water is required for such processes. For maintaining the hardness of the water, the re-cycled water is hardened by dissolving calcium carbonate and carbon dioxide in it, thereby forming calcium bicarbonate. An apparatus for hardening the water comprises a mixing container with inlets for waste water, carbon dioxide, and calcium carbonate, and with outlets for foam, hardened water and undissolved calcium carbonate.

Abstract: Method and apparatus for separating ink from pulped inked paper: a suspension of pulped paper and chemicals enters a cylindrical container tangentially near the container bottom and rotates around the interior of the container; the ink and chemicals form a foam that floats off the suspension of paper fibers; the suspension exits from the container tangentially near the container top; a funnel at the top of the container; a foam outlet near the axis of the container from the funnel; a vortex generator at the bottom of the container, which blows upwardly creating a vortex in the suspension; means disperse air in the suspension in the container inlet before the suspension enters the container through the container inlet; the dispersing means either comprises a rotor cooperating with a stator, or comprises deflector plates in the container inlet; air is supplied to the inlet at the dispersion means rotor or deflector plates; the deflector plates may be washed clean.

Abstract: Waste paper is fed into a horizontal drum and therein treated with suitable liquids to form pulp. A magnetic device is disposed adjacent one side of the drum to produce a magnetic field along one arcuate section and extending from the upper portion toward the bottom thereof. Magnetic particles mixed with the paper are carried by said arcuate section of the drum by virtue of the influence of the magnetic field until they reach the top where they leave the field and then fall downwardly into an inclined trough from which they gravitate to the exterior of the drum. Pulp is concurrently discharged from the drum.