Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H19/00—Coated paper; Coating material
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/01—Waste products, e.g. sludge

Definitions

• the invention relates to a method for recycling Rejects from paper, cardboard and cardboard manufacture and use for the production of paper in paper pulp or as Coating color for the paper industry.
• the raw material i.e. H. Cellulose, Wood, straw pulp or harder pulp also waste paper pulp, fillers and added pigments with which a closed surface should be achieved to the properties of the paper, especially the Whiteness, improve the opacity and printability of the paper.
• Natural printing papers contain up to 35% by weight Fillers, coated papers 25% to 50% by weight. The amount of filler depends very much on the intended use of the paper. Heavily weighed down Papers have lower strengths and poorer sizing properties.
• the filler content in the paper pulp is usually between 5 to 35 wt .-% and consists of primary pigment or recirculated Coating pigments, from residual coating colors or coated scrap can originate.
• the grain size plays an important role, since they have strong filler yield and physical properties of the paper, especially the porosity.
• the one in the paper remaining filler content is between 20 and 80% of that of the fiber suspension amount added.
• kaolin calcium carbonate
• precipitated calcium carbonate artificial aluminum silicates and - oxide hydrates
• titanium dioxide satin white
• talc calcium silicate
• rejects including semolina, deleted board or called cleaner reject
• the rejects have been proposed compacting and compacting using screw extruders, so that Volume to decrease. The total amount of rejects, which is disposed of, however, is not reduced.
• EP-A-0 183 863 describes the workup of mixed waste paper
• EP-A-0 493 726 relates to the processing a fiber component in which thermoplastics are attached to the fiber particles be attached.
• the object of the present invention is to provide of a new environmentally friendly concept, the rejects in particular to treat the centrifugal cleaner and the most complete To make recycling accessible.
• the object of the invention is in particular to provide a process for recycling rejects with simultaneous Saving energy and raw material costs, transportation costs as well as landfill costs.
• the above-mentioned object is achieved according to the invention by a process for recycling solid rejects from the manufacture of paper, cardboard and cardboard, in particular the Centrifugal cleaner from paper, cardboard and cardboard manufacture characterized that you have rejects, fibers, coating color and / or filler, optionally with the addition of water, to the desired one Grain size distribution milled and as a raw material for the pulp and / or coating color.
• the solid reject contains valuable raw materials that can be recovered using the present invention and after grinding in various paper manufacturing processes can be returned.
• rejects from paper mills which produces coated paper or cardboard types lots of flakes of coating color.
• the thicker the coating layer the more difficult it is to recover the flakes with the technology the state of the art.
• Double coated varieties or coated varieties Cardboard types can be mentioned here as special examples.
• SC paper manufacturers Farms that handle large amounts of fillers Lose rejects.
• the rejects are now ground and optionally with water, coating color, filler and / or Filler slurry added.
• the reject slurry or the ground powder then becomes the cycle of papermaking for the pulp again and / or supplied as a coating color.
• the distribution corresponds to Particle sizes of the reject material essentially the original Distribution in coating colors, fillers or filler / pigment slurries. At the same time, more can be done with the help of the present invention than 95% of the total rejects or the full amount recovered and returned to production.
• the reprocessed substance prepared according to the invention then functions, for example as a filler, which reduces the consumption of fresh filler or pigment can be consistently reduced.
• the grinding of the rejects is preferred in a centrifugal cleaner system after the last of ordinary several phases of a centrifugal cleaner installed.
• the good stuff from the additional cleaner system is returned to a previous phase and the residual amount of rejects forms the final reject.
• the simplest area of application is in an existing cleaner system provided that the grinding after the penultimate cleaner phase installed and the last cleaning process is used as the final stage.
• fillers and coating pigments both as a powder or in the form of a concentrated slurry, which is preferred Has 30 to 85 wt .-% solids for the paper pulp or for coating color production.
• the fresh ones Fillers and pigments are usually used by manufacturers the desired whiteness and grain size distribution as a slurry or as Powder provided.
• the so obtained Sieve passage consists of fibers, fillers, pigments, fine sand, Black particles and agglomerates from fillers and pigments or Pigments, fibers and fillers. Under filler are usually understood the fine particles used in the pulp; pigment is the fine particles used in the coating color Roger that.
• grinding as powder or slurry can be carried out continuously or discontinuously in conventional dry mills or wet mills, in particular agitator ball mills, for example with a Contents of 700 to 5000 I or larger can be carried out.
• grinding media preferably grinding balls, especially with with a diameter of 1 to 4 mm.
• Sieves preferably curved sieves, are usually used for processing for separating impurities (broken balls, separating agents, rust etc.) used.
• Laser measuring instruments are used for determination and Control of the fineness of grinding during the grinding process and the computer-aided Control of the agitator ball mill system.
• the ratio of fillers and / or pigments can be found in the rejects to vary fibers in a wide range. Particularly preferred in the sense of the present invention, it is rejects with a optionally enriched concentration of fillers and / or To use coating color, in the range of 5 to 90 wt .-%, in particular 30 wt .-% to 70 wt .-% based on the solids content lies. So the fiber content on the one hand or the filler and / or Coating color content, on the other hand, for example from 1 to 99% by weight or vary from 99 to 1% by weight. Enrichment in the sense of the present In particular, the invention includes the addition of fresh filler and / or fresh pigment.
• a fresh pigment and / or fresh filler kaolin natural or precipitated calcium carbonates, artificial or natural aluminum silicates and oxide hydrates, Titanium dioxide, satin white, dolomite, mica, metal, especially aluminum flakes, Bentonite, rutile, magnesium hydroxide, gypsum, layered silicates, Talc, calcium silicate and other stones and earth added.
• Fresh pigment or filler is preferably used as a powder, aqueous slurries containing fresh pigment and / or filler Presence of the rejects and possibly conventional grinding aids and / or dispersing aids to form a slurry with a solids content from, for example, 30 to 85% by weight, in particular 40 to 75 wt .-% used.
• the amount of fibers, coating color, is preferably added and / or filler (recycled or fresh) 1 to 100 wt .-%, based on the rejects.
• water to the water according to the invention ground rejects in a diluted slurry for the headbox use.
• water in a preferred embodiment in the presence of water in an amount of 1 to 1000 % By weight, in particular 100 to 1000% by weight, based on the solids content ground.
• the grinding there is also a large variation in whiteness and Grain size distribution possible, particularly due to the type and duration the grinding can be controlled. So it is possible to be relative on site coarse fresh filler and water with a large amount of rejects to mix this slurry into the pulp after grinding contribute. In the same way it is possible to go through on site Use a smaller amount of rejects for finer grinding with fresh pigment, which is then used as a coating pigment, serves especially in the primer.
• Wetting agents, stabilizers, grinding aids and dispersing aids used during the mixing and grinding of the rejects can be, as known for example from EP 0 625 611 A1 according to the invention, the required amount is compared the state of the art significantly reduced.
• the reject contains already a certain amount of the means mentioned according to the invention be returned to the paper manufacturing process.
• the powders or slurries obtainable with the aid of the present invention can be particularly advantageous in the paper industry, in particular for the production of a coating color for the paper line or in the paper pulp be used.
• a coating color for the paper line or in the paper pulp be used.
• the rejects ground according to the invention preferably in the coating color, with a high fiber content preferably used in the pulp. According to the invention, good retention on the sieve is obtained.
• the use of the one ground according to the invention is particularly preferred Rejects for the production of offset paper.
• the slurries according to the invention are also suitable for producing a Coating paint for lightweight, coated papers, in particular even at high application speeds, as well as for the production of roll offset papers, especially for the production of lightweight, coated roll offset paper, the coating of cardboard and special paper, such as labels, wallpaper, silicone base paper, self-copying, as well as the admixture for gravure papers.
• coating pigment slurries obtainable according to the invention in particular Can be used in sheetfed offset, especially for single sheetfed offset, Sheetfed double-stroke: Sheetfed offset primer and sheetfed offset top coat; - in web offset, especially for the LWC web offset single stroke, Web offset double line: Web offset primer and web offset top coat; - in gravure, especially for the LWC rotogravure single line, rotogravure double line: rotogravure pre-coat and rotogravure top coat; - in a box, especially for the Cardboard double coat: Cardboard primer and cardboard top coat and for Special papers, especially for labels and flexible packaging.
• the method offers the possibility of producing those produced according to the invention Pigment slurries without loss of quality in the manufactured with it Use raw papers, coatings and especially the final qualities.
• Semolina from the process of a commercially available paper machine from The prior art was converted into a 15% by weight suspension Grind slurry with a grain size of ⁇ 10 ⁇ m and the headbox added to the pulp.
• Ground rejects could increase the ash content in the paper be determined.
• the ash content increased, and the dosage of filler was reduced become. From the grinding plant, the stock was approx. 16 to 18 l / min of pigment slurry fed from ground rejects. To the The ash content could be maintained at the same level Usual dosage of fresh filler can be reduced from 10 l / h to 6.0 l / h.

Landscapes

• Paper (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Processing Of Solid Wastes (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)

Priority Applications (1)

Applications Claiming Priority (3)

Publications (2)

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Family Applications (1)

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Families Citing this family (18)

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• 2003
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