Core Paper

Abstract

A core paper comprising fiber material for producing a carrier material that can be laminated and that has at least one proportion of a reconstituted fiber material mixture and a wet sealer as a first additive, characterized in that the core paper comprises at least one active substance active on the boundary surface as a second additive for increasing capillarity at a weight proportion of 0.05% to 2% relative to the material.

1 . A core paper for producing a carrier material that can be laminated comprising:
 a fiber material according to the invention for producing a carrier material that can be laminated having a proportion of a reconstituted fiber material mixture and a wet sealer as a first additive,   a tenside as an active substance active on a boundary surface, and,   a second additive at a proportion of weight of 0.05% to 3%, relative to atro dry material for increasing capillarity.   
     
     
         2 . The core paper of  claim 1  wherein
 the proportion of reconstituted fiber material mixture is greater than 25%, between greater than 40% and 100%, preferably between 50% and 95%, particularly preferably between 70% and 90%, preferably in the range of 75%, more preferably above 80%, most preferably above 95% and especially up to 100% and, 
 the fiber material is in particular selected from a group comprising for example Kraft pulp and/or Kraft liner in particular from department store waste of corrugated paper and cardboard with at least 70% corrugated paper and residues of solid cardboard and or packaging paper, used corrugated cardboard boxes, shreds of unused cardboard with layers of Kraft or test liner, used corrugated cardboard boxes with Kraft liner and/or corrugated medium on pulp and/or thermo-chemical pulp, used corrugated cardboard with layers of test or Kraft liner and at least one layer of Kraft liner, used bags from Kraft pulp equipped as tear-resistant or non-tear-resistant, unused bags of Kraft pulp equipped as tear-resistant or non-tear-resistant, used cardboard and paper from Kraft pulp naturally colored and/or white, shreds from unused pulp paperboard and paper from Kraft pulp uncolored, new carrier bags from Kraft pulp with or without wet tensile strength resistant paper containing envelopes made of Kraft paper repeatedly covered and/or coated and/or used, magazine paper, newspapers, in particular daily newspapers, combinations thereof and the like. 
 
     
     
         3 . The core paper of  claim 1  wherein said wet sealer is selected as the first additive from a group comprising in particular compounds of epichlorohydrin resins, urea-, melamine-formaldehyde resins, phenol resins, acrylic resin dispersions, synthetic resin dispersions based on acrylic acid esters and/or styrene-butadiene, polyurethane-, polyolefin dispersions, polyamidoamine resins, polyamidoamine-epichlorohydrin resins, combinations thereof and the like. 
     
     
         4 . The core paper of  claim 1  wherein said active substance active on the boundary surface is selected as the second additive from the group comprising compounds which, in particular, strongly accumulate at the boundary surfaces, comprising at least a lipophilic hydrocarbon radical, and at least one hydrophilic functional group, and in particular surfactants, amphiphilic (bifunctional) compounds with at least one hydrophobic and one hydrophilic part of the molecule, wherein a hydrocarbon chain comprises eight to twenty-two carbon atoms, (dimethyl) siloxane chains, perfluorinated hydrocarbon chains, anionic surfactants in particular soaps, linear alkyl benzene sulfonate, alkane sulfonates, alkyl sulfates, alkyl ether sulfates, fatty alkyl polyethylene, glycol ether sulfates, fatty alkyl sulfates, nonionic surfactants, in particular fatty alkyl polyethylene glycol ether, fatty alcohol ethoxylates, fatty acid condensates, ethylene oxide/propylene oxide copolymers (EO/PO), alkyl phenol ethoxylates, sorbitan fatty acid ethers, sorbitan mono-(di, tri) laurate, -oleate, -palmitate, -stearate, polysorbates, sorbitan sesquioleates, alkyl polyglucosides N-methylglucamides, alkyl phenol polyethylene glycol ethers, fatty alcohols, oxo-alcohols, Ziegler alcohols, alkyl phenols, ethylene oxide, cationic surfactants, in particular quaternary ammonium compounds containing hydrophobic groups, salts of long-chain primary amines, amphoteric surfactants, in particular betaine, amino acid surfactants, N-(acylamidoalkyl) betaine, propylene oxide, polyelectrolytes, emulsifiers, wetting and dispersing agents, humectants, and polysaccharides, in particular sorbitol, combinations thereof and the like. 
     
     
         5 . Core paper according to one of the preceding claims, characterized in that said material suspension comprises further additives such as in particular retention agents, drainage aid agents, retention agents dual systems or microparticle systems, wet and dry sealers, fillers and or pigments, selected in particular s from a group of talc, titanium dioxide, aluminum hydroxide, bentonite, barium sulfate, calcium carbonate, kaolin, gypsum, and binding agent components, color coating components, defoamers, deaerators, biocides, enzymes, bleaching aid agents, optical brighteners, dyes, shading dyes, fixatives, precipitating agents (fixing agents), wetting agents, pH regulators combinations thereof and the like. 
     
     
         6 . The core paper of  claim 1  wherein said active substance active on the boundary surface is added in particular in a proportion of weight of 0.1% to 3%, preferably from 0.5% to 1.25%, more preferably from 0.2% to 0.75% and most preferably from 0.25% to 0.5% based on atro dry material. 
     
     
         7 . A method for producing a core paper comprising the steps of:
 providing a material suspension with at least one proportion of a reconstituted fiber material mixture and a wet sealer as a first additive, preferably from a stock preparation process;   adding an active substance active on a boundary surface as a second additive in said finished stock suspension in the constant part of a paper production process;   producing a core paper from said material suspension on a paper machine, in particular on a Fourdrinier wire, in particular with a vibrating screen, and with or without a dandy roll in particular with an attached hybrid former and a web guide through a calender.   
     
     
         8 . The method of  claim 7  wherein said stock preparation process comprises at least one method step selected from a group comprising screening of a fiber material, in particular, with multi-stage slot-pressure-screening, a cleaner system process, dispersing stages, ash removal processes, combinations thereof and the like. 
     
     
         9 . The method of  claim 7  further comprising the additional step of:
 impregnating said core paper with synthetic resin, wherein impregnation is in particular resinification, saturation and/or resin impregnation for the production of particle, in particular, fiber composite material. 
 
     
     
         10 . The method of  claim 7  further comprising the additional step of:
 forming a stack made of core paper using pressure and temperature to produce laminated material. 
 
     
     
         11 . A core paper which was produced according to the method according to  claim 7 . 
     
     
         12 . The use of the core paper according to  claim 1  as a material component in composite materials, in particular in laminate materials, compact boards, fiber composites, particle composites and interpenetrating composites. 
     
     
         13 . The use of the core paper according to  claim 1  as carrier material for a web-shaped layer structure and in particular for overlays, decorative paper, films and nonwoven materials and/or as a cover layer, in particular as an overlay and pre-impregnated paper and/or as a carrier material on carrier boards in particular of wood fiberboards, such as chip boards, oriented strand boards (OSB), fiberboards of high or medium density, plywood, mineral-bonded wood materials on a plastic base, solid wood panels, countertops, floor covering, and preferably for the production of fiber composite materials, such as natural fiber reinforced plastics, wood-plastic composites and fiber-ceramic composites, and/or in return thereof, in particular as regenerated paper for coating back sides such as in particular for laminates, surface-coated boards such as wood fiberboards, panels, and combinations thereof and the like.