EP2794991B1 - Impregnated abrasive base papers and abrasive papers produced therefrom - Google Patents
Impregnated abrasive base papers and abrasive papers produced therefrom Download PDFInfo
- Publication number
- EP2794991B1 EP2794991B1 EP12808683.2A EP12808683A EP2794991B1 EP 2794991 B1 EP2794991 B1 EP 2794991B1 EP 12808683 A EP12808683 A EP 12808683A EP 2794991 B1 EP2794991 B1 EP 2794991B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- abrasive paper
- impregnated
- abrasive
- paper
- raw abrasive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004513 sizing Methods 0.000 claims description 28
- 230000004888 barrier function Effects 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000003490 calendering Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims 2
- 239000000123 paper Substances 0.000 description 138
- 239000003795 chemical substances by application Substances 0.000 description 43
- 239000000835 fiber Substances 0.000 description 28
- 238000005470 impregnation Methods 0.000 description 14
- 239000006061 abrasive grain Substances 0.000 description 13
- 238000000576 coating method Methods 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- 238000000227 grinding Methods 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 229920001577 copolymer Polymers 0.000 description 7
- 238000001035 drying Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 6
- 239000002390 adhesive tape Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000003082 abrasive agent Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000001238 wet grinding Methods 0.000 description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 3
- 125000000129 anionic group Chemical group 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 229920001568 phenolic resin Polymers 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 239000005871 repellent Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229920003043 Cellulose fiber Polymers 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 235000012216 bentonite Nutrition 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 238000003776 cleavage reaction Methods 0.000 description 2
- 238000009837 dry grinding Methods 0.000 description 2
- 239000012784 inorganic fiber Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 229920003052 natural elastomer Polymers 0.000 description 2
- 229920001194 natural rubber Polymers 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 239000011118 polyvinyl acetate Substances 0.000 description 2
- 229920002689 polyvinyl acetate Polymers 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- HXHCOXPZCUFAJI-UHFFFAOYSA-N prop-2-enoic acid;styrene Chemical compound OC(=O)C=C.C=CC1=CC=CC=C1 HXHCOXPZCUFAJI-UHFFFAOYSA-N 0.000 description 2
- 230000002940 repellent Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000007017 scission Effects 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 239000012209 synthetic fiber Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 229920002748 Basalt fiber Polymers 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 229920002873 Polyethylenimine Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 229920006321 anionic cellulose Polymers 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 229910001510 metal chloride Inorganic materials 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920000867 polyelectrolyte Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- KUKFKAPJCRZILJ-UHFFFAOYSA-N prop-2-enenitrile;prop-2-enoic acid Chemical compound C=CC#N.OC(=O)C=C KUKFKAPJCRZILJ-UHFFFAOYSA-N 0.000 description 1
- 239000004627 regenerated cellulose Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
- B24D5/02—Wheels in one piece
- B24D5/04—Wheels in one piece with reinforcing means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
- B24D11/001—Manufacture of flexible abrasive materials
- B24D11/005—Making abrasive webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
- B24D11/02—Backings, e.g. foils, webs, mesh fabrics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/001—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as supporting member
- B24D3/002—Flexible supporting members, e.g. paper, woven, plastic materials
- B24D3/004—Flexible supporting members, e.g. paper, woven, plastic materials with special coatings
-
- 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
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
-
- 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
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/47—Condensation polymers of aldehydes or ketones
-
- 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
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/52—Epoxy resins
-
- 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
- D21H19/36—Coatings with pigments
-
- 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
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/46—Non-macromolecular organic compounds
- D21H19/48—Diolefins, e.g. butadiene; Aromatic vinyl monomers, e.g. styrene; Polymerisable unsaturated acids or derivatives thereof, e.g. acrylic acid
-
- 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
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
-
- 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
-
- 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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
Definitions
- the invention relates to an impregnated abrasive paper high flexibility and a basis weight 110 - 360 g / m 2 according to the preamble of claim 1, a sandpaper produced therefrom, and a method for producing such Schleifrohpapiere and abrasive papers.
- Paper carriers have been used for many years to produce sheet, belt and disc shaped abrasives. A distinction is made between dry grinding and wet grinding papers.
- the U.S. Patent 4,240,807 describes by way of example the differences between these two sandpaper variants.
- Typical wet grinding papers are very porous and flexible and saturated with 15-40% of a synthetic resin. They have a basis weight from 70 to 200 g / m 2 . These wet sanding papers are soft and flexible, but also very firm and resistant, especially when soaked in water.
- Sandpaper is coated on at least one side with a so-called base resin. The base resin serves to bond the abrasive grains with the abrasive paper backing.
- the base resin does not penetrate into the porous paper, but remains on the surface, between the impregnated paper and the base resin often an intermediate coating, the so-called barrier coat applied.
- the disadvantage of the wet grinding papers described is their high porosity and the associated high absorbency compared to aqueous impregnating agents.
- the aqueous impregnating agent should be absorbed quickly and evenly by the paper during the impregnation process, so that a high nip strength and flexibility is achieved, on the other hand absorbs the paper due to the high absorbency much water with the impregnation, which must be removed in the subsequent drying again , This is associated with a very high energy consumption, which is economically as well as environmentally questionable.
- cellulose fibers In the production of abrasive papers, cellulose fibers, ie fibers from renewable raw materials, are preferably used.
- the aqueous impregnating agents used are based mainly on petroleum raw materials. The less impregnating agent is used in relation to the raw materials used for the production of sandpaper, the better the ratio of non-renewable to environmentally friendly, renewable raw materials.
- Typical dry sanding papers are very dense, less porous and much stiffer than wet sandpaper.
- Dry grinding papers are impregnated with 0-15% of a synthetic resin and have a basis weight of 65-200 g / m 2 .
- To reduce the absorbency of these papers are glued.
- Dry abrasive papers are typically coated directly with the base resin, but may also have a barrier line between the paper surface and the base resin. Dry abrasive papers have the disadvantage that the pulp used for their production is very heavily ground. These papers are therefore only slightly porous and very stiff. Due to the low porosity, often associated with a complete sizing, these papers are hardly absorbent and the impregnation does not penetrate the paper, but is mainly on the two surfaces.
- the paper is sealed well against the subsequently applied base coat and on a barrier line can be dispensed with in many cases. Due to the high rigidity, these sanding papers bend easily at the edges. As a result, the bond between base coat and paper carrier is damaged and the abrasive grain breaks at these points. A similar effect occurs at point loads during the grinding process.
- the stiff dry-sanding paper does not spread these loads evenly over a larger area, as is the case with flexible wet-sanding papers, but absorbs all the stress at the point of origin. This often leads to overloading of the bond between the base coat and the paper and consequently to a tearing of the abrasive grains at this point.
- the British patent GB 1,012,441 describes the production of abrasive papers from highly porous, unground base papers, which are compressed and compressed between a cylinder and a blanket.
- the papers are preferably impregnated prior to compaction.
- the abrasive papers produced thereby are flexible and have a high gap strength.
- their high surface roughness and the high elongation in the longitudinal direction due to the compression process are disadvantageous.
- the high surface roughness excludes a coating of fine abrasive grains. Because of the high elongation, the abrasive papers can not be used as abrasive belts or grinding wheels because they deform during the grinding process and become unusable.
- Object of the present invention is, therefore, impregnated abrasive base papers with basis weights of 110 - 360 provide g / m 2 , which have the same flexibility and strength, as in the US 4,240,807 described wet grinding papers, but are significantly cheaper and more environmentally friendly to manufacture.
- the abrasive base paper according to the invention is partially glued by means of a synthetic sizing agent.
- the addition amount of the sizing agent is between 0.5% and 3.0% based on the dry fibers, so that the abrasive base paper has a suction height in the longitudinal direction of 2 mm to 70 mm.
- the abrasive base paper is impregnated with an aqueous impregnating agent.
- the abrasive base paper has a tensile stiffness index in the longitudinal direction of 2.0 MNm / kg to 7.0 MNm / kg and a modulus of elasticity in the longitudinal direction of 2000 to 5500 MPa.
- the inventive abrasive base paper can preferably be used as a replacement for the known dry abrasive papers.
- use as wet sandpaper is also possible.
- Abrasive materials for example abrasive belts and grinding wheels, which are produced from the inventive abrasive base paper have a significantly longer service life than abrasives from the known dry abrasive papers. Due to the much higher flexibility and elasticity of the abrasive base paper according to the invention, the abrasives produced therefrom better absorb the punctiform loads and edge loads arising during use. As a result, significantly fewer abrasive grains are torn and the abrasive can be used much longer than an abrasive made from the known dry abrasive papers.
- the abrasive paper according to the invention comprises an impregnated abrasive base paper which contains a synthetic sizing agent and has been sanded on at least one side.
- the impregnated abrasive base paper can be coated with a barrier coat before the application of the base coat.
- the impregnated abrasive base paper can still be calendered.
- Natural, synthetic and / or inorganic fibers are used to produce the abrasive base paper according to the invention.
- suitable natural fibers are cellulose fibers from softwoods, hardwoods, cotton and other suitable plants.
- Other examples of natural fibers are wool and silk.
- Suitable synthetic fibers are, for example, fibers made of regenerated cellulose, polyester, polypropylene, polyvinyl alcohol, polyamide and multicomponent fibers.
- Suitable inorganic fibers are e.g. Glass fibers, basalt fibers and carbon fibers.
- the fibers are dispersed in water in a known manner.
- To the pulp thus produced is then added according to the invention so much of a synthetic sizing agent that the fibers are partially covered on their surface with sizing. It is important to ensure that not too much sizing agent is added and the fibers are completely covered.
- the partial covering of the fiber surface with the sizing agent also called partial sizing, reduces the absorbency of the abrasive base paper formed from this pulp.
- the reduced absorbency of the abrasive base paper according to the invention causes a lower water and impregnant absorption in the subsequent impregnation with aqueous impregnating agents.
- the aqueous impregnating agent is equally equally distributed in the paper as in a not sized paper.
- the amount of synthetic sizing agent necessary for a partial sizing of the abrasive raw paper according to the invention is determined by the suction height of the paper support.
- the addition amount of the synthetic sizing agent is between 0.5 and 3.0% based on the dry fibers.
- the synthetic sizing agent can be added to both the thinstock and the thick stock.
- the synthetic sizing agent can be dosed directly into the pulper or added before and / or after the vertical sizer.
- Suitable synthetic sizing agents for producing the inventive abrasive base paper are, for example, styrene-acrylic acid ester copolymers, acrylonitrile-acrylic acid ester copolymers, mixtures of alkyldiketene and acrylic ester copolymers, styrene-acrylic acid ester copolymers, acrylic ester copolymers or mixtures thereof.
- the synthetic sizing agents may be nonionic, anionic, cationic or amphoteric.
- a cationic polyelectrolyte as a retention agent to bind the anionic synthetic sizing agent to the likewise anionic cellulose fiber.
- Suitable retention aids are, for example, bentonites, polyacrylamides, Polyethyleneimines, polyvinylamines or mixtures thereof.
- paper stock can be further added, if necessary, further customary in papermaking auxiliaries, such as wet strength agents, fillers, fixing agents and / or colors.
- the abrasive base paper thus produced has a basis weight of 100-300 g / m 2 , preferably 120-280 g / m 2 and particularly preferably 120-260 g / m 2 , a suction height in the longitudinal direction of 2-70 mm, preferably of 3 - 65 mm and more preferably from 5 - 60 mm, a porosity of 40 - 70%, preferably from 45 - 70% and particularly preferably from 50 - 70%, a thickness of 0.20 - 1.00 mm, preferably from 0 , 20-0.90 mm and more preferably from 0.20-0.80 mm, a breaking force dry in the longitudinal direction of 50-500 N / 15 mm, preferably 60-450 N / 15 mm
- the longitudinal direction is understood to mean the paper maker's usual designation for the running direction of the paper through the paper machine.
- Transverse direction therefore refers to the direction at 90 ° angle across the direction of the paper.
- the abrasive base paper is then impregnated. That is, the paper is impregnated with an impregnating agent.
- An impregnation penetrates the entire abrasive base paper evenly and thus differs from a superficially applied coating.
- the impregnation is necessary in order to give the inventive abrasive base paper the necessary strength and flexibility, to create a non-absorbent substrate for the subsequent coatings and to glue the individual fibers together so strongly that the abrasive grains applied in a subsequent operation are not too weak Fiber-to-fiber bonds during application tear from the surface of the abrasive paper according to the invention.
- the nip strength measures the fiber-fiber bond perpendicular to the surface of the paper carrier.
- Impregnated paper supports in which the impregnant is concentrated only on the surface of the paper support have a nip strength equivalent to that of the unimpregnated paper support, while paper supports completely saturated with impregnant have a significantly higher nip strength.
- the gap strength, measured in the transverse direction, for the inventive impregnated abrasive base paper is 1.5-6.0 N / 25 mm, preferably 1.8-5.5 N / 25 mm and particularly preferably 2.0-5.0 N / 25 mm.
- Non-impregnated abrasive base papers usually have a transverse splitting strength of 1.3-1.5 N / 25 mm.
- Suitable impregnating agents for the production of the abrasive base paper according to the invention are polymer dispersions, polymer solutions or mixtures thereof.
- Suitable polymer dispersions are, for example, aqueous dispersions of acrylic esters, polyvinyl acetate, acrylonitrile-butadiene rubber, acrylate-styrene copolymers, ethylene-vinyl acetate copolymers, styrene-butadiene rubber, phenolic resin, epoxy resin, natural rubber or mixtures thereof.
- Suitable polymer solutions include polyvinyl alcohol in water, starch in water, melamine-formaldehyde resin in water, urea-formaldehyde resin in water or mixtures it.
- a particularly suitable impregnating agent according to the invention is an aqueous Sytrol-butadiene rubber dispersion having a glass transition temperature between -30 ° C and +20 ° C.
- the amount of impregnating agent is between 5% by weight and 20% by weight, preferably between 10% by weight and 15% by weight, of the dry dispersion, based on the weight of the paper to be impregnated.
- a barrier coat is applied to one side of the impregnated paper.
- This barrier coat can be prepared, for example, by applying an aqueous dispersion based on acrylic acid esters, polyvinyl acetate, acrylonitrile-butadiene rubber, acrylic ester-styrene copolymers, ethylene-vinyl acetate copolymers, styrene-butadiene rubber, phenolic resin, epoxy resin, natural rubber or mixtures thereof ,
- the amount applied after drying is 2 - 15 g / m 2 , preferably 3 - 12 g / m 2 .
- Both the impregnating agent and the barrier can still be added various additives and / or fillers.
- additives are paints, crosslinking agents, water repellents, oil repellents, hydrophilicizing agents, antistatic agents or mixtures thereof.
- fillers e.g. Kaolin, titanium dioxide, talc, calcium carbonate, silica, bentonites or mixtures thereof.
- the impregnation of the abrasive base paper and coating of the impregnated abrasive base paper can either inside the paper machine or outside in one specially designed impregnation and coating machine happen.
- Suitable impregnation methods are, for example, size press, dip impregnation, foam impregnation, roll impregnation or spraying.
- Suitable coating methods are, for example, roller blade, knife blade, air brush or roller application.
- the impregnated and possibly coated with barrier coating abrasive base paper can be calendered.
- the impregnated abrasive base paper according to the invention preferably passes through the nip of a pair of rolls consisting of a steel roll and a rubber roll with a nip pressure of from 30 to 300 N / mm, preferably from 50 to 250 N / 15 mm. If the impregnated abrasive base paper according to the invention is coated with a barrier coating, it is fed to the calender in such a way that the side comes into contact with the barrier coating with the steel roll.
- the calendering temperature is between 20 ° and 80 ° C, preferably between 50 and 70 ° C.
- the impregnated and calendered abrasive base paper according to the invention has a basis weight of 110-360 g / m 2 , preferably of 120-340 g / m 2 and more preferably of 130-310 g / m 2 , a thickness of 0.14-0.90 mm , preferably from 0.15 to 0.80 mm and more preferably from 0.16 to 0.70 mm, a porosity of from 20 to 70%, preferably from 20 to 60% and particularly preferably from 20 to 50%, a breaking force dry in the longitudinal direction of 150-550 N / 15mm, preferably 170-500 N / 15mm, more preferably 180-450 N / 15mm, dry ultimate tensile strength of 80-300 N / 15mm, preferably 90-280 N / 15mm , more preferably from 100 to 270 N / 15mm, an elongation dry in Lengthwise from 1.0 to 5.0%, preferably from 1.1 to 4.8%, more preferably from 1.2 to 4.5%, dry to
- the impregnated, barrier-coated and calendered abrasive paper according to the invention has a basis weight of from 115 to 370 g / m 2 , preferably from 125 to 350 g / m 2 and particularly preferably from 135 to 320 g / m 2 , a thickness of 0.15.
- 0.90 mm preferably 0.16-0.80 mm and more preferably 0.17-0.70 mm, a porosity of 20-70%, preferably 20-60% and particularly preferably 20-50% , a breaking force dry in the longitudinal direction of 150-550 N / 15mm, preferably 170-500 N / 15mm, more preferably 180-450 N / 15mm, a transverse dry tensile strength of 80-300 N / 15mm, preferably 90-280 N / 15mm, more preferably from 100 to 270 N / 15mm, an elongation dry in the longitudinal direction of 1.0 to 5.0%, preferably 1.1 to 4.8%, more preferably 1.2 to 4.5%, an elongation dry in Transverse direction from 2.0 to 9.0%, preferably from 2.5 to 8.7%, particularly preferably from 2.8 to 8.5%, a tear propagation resistance according to Elmendorf in the transverse direction of 800 to 3000 mN, preferably of 1000 2700 mN, more preferably from 1200 to 2500 mN, a
- the impregnated and calendered base paper according to the invention is still sanded.
- Besanden is understood to mean the application of a base coat to the inventive abrasive base paper which then sprinkling the abrasive grain, drying the base coat, applying a top coat to the abrasive grain, and finally drying the top coat.
- the base coat consists z.
- the abrasive grains are then sprinkled onto the still-wet basecoat, the individual grains being optimally aligned by electrostatic devices on the abrasive base paper. Subsequently, the abrasive base paper coated with the wet base coat and the abrasive grains adhering thereto runs in a drying oven in which the base coat is dried. After drying, the abrasive grains are coated with the topcoat.
- the topcoat is usually a hard, thermosetting resin which additionally anchors the abrasive grains on the sandpaper. The sanding is completed by the hardening of the primer and topcoat.
- the abrasive paper according to the invention is used as grinding wheels, abrasive belts and bow-shaped abrasive articles.
Description
Die Erfindung betrifft ein imprägniertes Schleifrohpapier hoher Flexibilität und einer Flächenmasse 110 - 360 g/m2 gemäß dem Oberbegriff des Anspruchs 1, ein daraus hergestelltes Schleifpapier sowie ein Verfahren zur Herstellung solcher Schleifrohpapiere und Schleifpapiere.The invention relates to an impregnated abrasive paper high flexibility and a basis weight 110 - 360 g / m 2 according to the preamble of claim 1, a sandpaper produced therefrom, and a method for producing such Schleifrohpapiere and abrasive papers.
Seit vielen Jahren werden zur Herstellung von bogen-, band- und scheibenförmigen Schleifmitteln Papierträger verwendet. Dabei wird zwischen Trockenschleif- und Nassschleifpapieren unterschieden. Die
Typische Trockenschleifpapiere sind sehr dicht, wenig porös und sehr viel steifer als Nassschleifpapiere. Trockenschleifpapiere sind mit 0-15% eines synthetischen Harzes getränkt und haben eine Flächenmasse von 65 - 200 g/m2. Zur Verringerung der Saugfähigkeit sind diese Papiere geleimt. Trockenschleifpapiere werden in der Regel direkt mit dem Grundharz beschichtet, können jedoch auch einen Sperrstrich zwischen der Papieroberfläche und dem Grundharz besitzen. Trockenschleifpapiere haben den Nachteil, dass der zu ihrer Herstellung verwendete Zellstoff sehr stark gemahlen ist. Diese Papiere sind demzufolge nur noch wenig porös und sehr steif. Durch die geringe Porosität, verbunden oft noch mit einer vollständigen Leimung, sind diese Papiere kaum mehr saugfähig und die Imprägnierung durchdringt das Papier nicht, sondern befindet sich hauptsächlich auf den beiden Oberflächen. Dadurch wird das Papier gut gegen den anschließend aufzubringenden Grundlack abgedichtet und auf einen Sperrstrich kann in vielen Fällen verzichtet werden. Durch die hohe Steifigkeit knicken diese Schleifpapiere leicht an den Kanten. Dadurch wird der Verbund zwischen Grundlack und Papierträger geschädigt und das Schleifkorn reißt an diesen Stellen aus. Ein ähnlicher Effekt tritt bei punktförmigen Belastungen während des Schleifvorgangs auf. Das steife Trockenschleifpapier verteilt diese Belastungen nicht gleichmäßig auf eine größere Fläche, wie das bei flexiblen Nassschleifpapieren der Fall ist, sondern nimmt die gesamte Belastung am Entstehungsort auf. Das führt sehr oft zu Überbelastungen der Verbindung zwischen Grundlack und Papier und folglich zu einem Ausreißen der Schleifkörner an dieser Stelle.Typical dry sanding papers are very dense, less porous and much stiffer than wet sandpaper. Dry grinding papers are impregnated with 0-15% of a synthetic resin and have a basis weight of 65-200 g / m 2 . To reduce the absorbency of these papers are glued. Dry abrasive papers are typically coated directly with the base resin, but may also have a barrier line between the paper surface and the base resin. Dry abrasive papers have the disadvantage that the pulp used for their production is very heavily ground. These papers are therefore only slightly porous and very stiff. Due to the low porosity, often associated with a complete sizing, these papers are hardly absorbent and the impregnation does not penetrate the paper, but is mainly on the two surfaces. As a result, the paper is sealed well against the subsequently applied base coat and on a barrier line can be dispensed with in many cases. Due to the high rigidity, these sanding papers bend easily at the edges. As a result, the bond between base coat and paper carrier is damaged and the abrasive grain breaks at these points. A similar effect occurs at point loads during the grinding process. The stiff dry-sanding paper does not spread these loads evenly over a larger area, as is the case with flexible wet-sanding papers, but absorbs all the stress at the point of origin. This often leads to overloading of the bond between the base coat and the paper and consequently to a tearing of the abrasive grains at this point.
In der
Die britische Patentschrift
Aufgabe der vorliegenden Erfindung ist es daher, imprägnierte Schleifrohpapiere mit Flächenmassen von 110 - 360 g/m2 bereitzustellen, die die gleiche Flexibilität und Festigkeit besitzen, wie die in der
Diese Aufgabe wird erfindungsgemäß durch ein Schleifrohpapier mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Ausführungen sind den Ansprüchen 2 bis 6 zu entnehmen. Ein Schleifpapier, das ein solches imprägniertes Schleifrohpapier umfasst, ist dem Anspruch 7 zu entnehmen. Ein Verfahren zur Herstellung eines derartigen Schleifrohpapiers geht aus Anspruch 8 hervor.This object is achieved by a base paper with the features of claim 1. Advantageous embodiments are given in claims 2 to 6. An abrasive paper comprising such an impregnated abrasive base paper is given in claim 7. A method for producing such a base paper is disclosed in claim 8.
Das erfindungsgemäße Schleifrohpapier ist mittels eines synthetischen Leimungsmittels teilgeleimt. Die Zugabemenge des Leimungsmittels beträgt zwischen 0,5 % - 3,0 % bezogen auf die trockenen Fasern, so dass das Schleifrohpapier eine Saughöhe in Längsrichtung von 2 mm bis 70 mm besitzt. Weiterhin ist das Schleifrohpapier mit einem wässrigen Imprägniermittel imprägniert. Das Schleifrohpapier besitzt einen Zugsteifigkeitsindex in Längsrichtung von 2,0 MNm/kg bis 7,0 MNm/kg und ein Elastizitätsmodul in Längsrichtung von 2000 bis 5500 MPa.The abrasive base paper according to the invention is partially glued by means of a synthetic sizing agent. The addition amount of the sizing agent is between 0.5% and 3.0% based on the dry fibers, so that the abrasive base paper has a suction height in the longitudinal direction of 2 mm to 70 mm. Furthermore, the abrasive base paper is impregnated with an aqueous impregnating agent. The abrasive base paper has a tensile stiffness index in the longitudinal direction of 2.0 MNm / kg to 7.0 MNm / kg and a modulus of elasticity in the longitudinal direction of 2000 to 5500 MPa.
Das erfindungsgemäße Schleifrohpapier kann bevorzugt als Ersatz für die bekannten Trockenschleifpapiere verwendet werden. Eine Verwendung als Nassschleifpapier ist jedoch ebenfalls möglich.The inventive abrasive base paper can preferably be used as a replacement for the known dry abrasive papers. However, use as wet sandpaper is also possible.
Schleifmittel, zum Beispiel Schleifbänder und Schleifscheiben, die aus dem erfindungsgemäßen Schleifrohpapier hergestellt werden, haben eine deutlich längere Lebensdauer als Schleifmittel aus den bekannten Trockenschleifpapieren. Durch die wesentlich höhere Flexibilität und Elastizität des erfindungsgemäßen Schleifrohpapiers nehmen die daraus hergestellten Schleifmittel die bei der Anwendung entstehenden punktförmigen Belastungen und Kantenbelastungen besser auf. Dadurch werden deutlich weniger Schleifkörner ausgerissen und das Schleifmittel kann wesentlich länger verwendet werden als ein Schleifmittel, das aus den bekannten Trockenschleifpapieren hergestellt wird.Abrasive materials, for example abrasive belts and grinding wheels, which are produced from the inventive abrasive base paper have a significantly longer service life than abrasives from the known dry abrasive papers. Due to the much higher flexibility and elasticity of the abrasive base paper according to the invention, the abrasives produced therefrom better absorb the punctiform loads and edge loads arising during use. As a result, significantly fewer abrasive grains are torn and the abrasive can be used much longer than an abrasive made from the known dry abrasive papers.
Das erfindungsgemäße Schleifpapier umfasst ein imprägniertes Schleifrohpapier, das ein synthetisches Leimungsmittel enthält und auf mindestens einer Seite besandet ist. Zur besseren Verankerung des Grundlacks, der die Schleifkörner an das Papier klebt, kann das imprägnierte Schleifrohpapier vor dem Auftrag des Grundlacks noch mit einem Sperrstrich beschichtet werden. Zur Erhöhung der Weichheit und Glätte kann das imprägnierte Schleifrohpapier noch kalandriert werden.The abrasive paper according to the invention comprises an impregnated abrasive base paper which contains a synthetic sizing agent and has been sanded on at least one side. For better anchoring of the base coat, which adheres the abrasive grains to the paper, the impregnated abrasive base paper can be coated with a barrier coat before the application of the base coat. To increase the softness and smoothness, the impregnated abrasive base paper can still be calendered.
Zur Herstellung des erfindungsgemäßen Schleifrohpapiers werden natürliche, synthetische und/oder anorganische Fasern verwendet. Beispiele für geeignete natürliche Fasern sind Zellulosefasern aus Nadelhölzern, Laubhölzern, Baumwolle und anderen geeigneten Pflanzen. Weitere Beispiele für natürliche Fasern sind Wolle und Seide.Natural, synthetic and / or inorganic fibers are used to produce the abrasive base paper according to the invention. Examples of suitable natural fibers are cellulose fibers from softwoods, hardwoods, cotton and other suitable plants. Other examples of natural fibers are wool and silk.
Geeignete synthetische Fasern sind z.B. Fasern aus Regeneratzellulose, Polyester, Polypropylen, Polyvinylalkohol, Polyamid und Mehrkomponentenfasern.Suitable synthetic fibers are, for example, fibers made of regenerated cellulose, polyester, polypropylene, polyvinyl alcohol, polyamide and multicomponent fibers.
Geeignete anorganische Fasern sind z.B. Glasfasern, Basaltfasern und Kohlefasern.Suitable inorganic fibers are e.g. Glass fibers, basalt fibers and carbon fibers.
Die Fasern werden in bekannter Weise in Wasser dispergiert. Zu dem so hergestellten Faserbrei wird dann erfindungsgemäß so viel eines synthetisches Leimungsmittels zugegeben, dass die Fasern an ihrer Oberfläche teilweise mit Leimungsmittel bedeckt sind. Dabei ist darauf ist zu achten, dass nicht zu viel Leimungsmittel zugegeben wird und die Fasern vollständig bedeckt werden. Die teilweise Bedeckung der Faseroberfläche mit dem Leimungsmittel, auch Teilleimung genannt, verringert die Saugfähigkeit des aus diesem Faserbrei gebildeten Schleifrohpapiers. Die verringerte Saugfähigkeit des erfindungsgemäßen Schleifrohpapiers bewirkt eine geringere Wasser- und Imprägniermittelaufnahme bei der anschließenden Imprägnierung mit wässrigen Imprägniermitteln. Dadurch kann mit höheren Feststoffgehalten des Imprägniermittels gearbeitet werden und bei der Trocknung des imprägnierten Papierträgers muss wesentlich weniger Wasser entfernt werden, wie bei einem vergleichbar imprägnierten, ungeleimten Schleifrohpapier. Dabei wurde überraschend gefunden, dass beim erfindungsgemäßen teilgeleimten Schleifrohpapier im Gegensatz zu einem vollgeleimten Schleifrohpapier, bei dem die Fasern vollständig mit dem Leimungsmittel bedeckt sind, das wässrige Imprägniermittel genauso gleichmäßig im Papier verteilt ist wie bei einem nicht geleimten Papier. Die zu einer erfindungsgemäßen Teilleimung des Schleifrohpapiers nötige Menge an synthetischem Leimungsmittel wird durch die Saughöhe des Papierträgers ermittelt. Dabei wird so viel synthetisches Leimungsmittel zugegeben, dass eine Saughöhe in Längsrichtung nach DIN ISO 8787 von 2 - 70 mm, bevorzugt von 3 - 65 mm und besonders bevorzugt von 5 - bis 60 mm erreicht wird. Da der Faserbrei zur Herstellung des erfindungsgemäßen Schleifrohpapiers nicht oder nur sehr gering gemahlen wird, wird die Saughöhe allein durch die Menge des zugegebenen synthetischen Leimungsmittels bestimmt. Damit ist auch ersichtlich, dass sich zur Herstellung des erfindungsgemäßen Schleifrohpapiers nur solche synthetischen Leimungsmittel eignen, die keiner Nachreifung unterliegen, das heißt, die schon am Ende des Papierherstellungsprozesses vollständig ausreagiert haben. Die Zugabemenge des synthetischen Leimungsmittels liegt dabei zwischen 0,5 - 3,0 % bezogen auf die trockenen Fasern. Das synthetische Leimungsmittel kann sowohl in den Dünnstoff als auch in den Dickstoff zugegeben werden. So kann das synthetische Leimungsmittel zum Beispiel direkt in den Pulper dosiert werden oder vor und/oder nach dem Vertikalsichter zugegeben werden.The fibers are dispersed in water in a known manner. To the pulp thus produced is then added according to the invention so much of a synthetic sizing agent that the fibers are partially covered on their surface with sizing. It is important to ensure that not too much sizing agent is added and the fibers are completely covered. The partial covering of the fiber surface with the sizing agent, also called partial sizing, reduces the absorbency of the abrasive base paper formed from this pulp. The reduced absorbency of the abrasive base paper according to the invention causes a lower water and impregnant absorption in the subsequent impregnation with aqueous impregnating agents. As a result, it is possible to work with higher solids contents of the impregnating agent and substantially less water has to be removed during the drying of the impregnated paper carrier, as in the case of a comparably impregnated, unsized abrasive base paper. It was surprisingly found that in contrast to a fully sized abrasive base paper in which the fibers are completely covered with the sizing agent according to the invention, the aqueous impregnating agent is equally equally distributed in the paper as in a not sized paper. The amount of synthetic sizing agent necessary for a partial sizing of the abrasive raw paper according to the invention is determined by the suction height of the paper support. In this case, so much synthetic sizing agent is added that a suction height in the longitudinal direction according to DIN ISO 8787 of 2 -. 70 mm, preferably from 3 to 65 mm and particularly preferably from 5 to 60 mm is achieved. Since the pulp is not or only very slightly ground for the production of abrasive raw paper according to the invention, the suction height is determined solely by the amount of added synthetic sizing agent. Thus, it is also apparent that only those synthetic sizing agents are suitable for the production of the abrasive base paper according to the invention, which are not subject to post-maturation, that is, which have fully reacted already at the end of the papermaking process. The addition amount of the synthetic sizing agent is between 0.5 and 3.0% based on the dry fibers. The synthetic sizing agent can be added to both the thinstock and the thick stock. For example, the synthetic sizing agent can be dosed directly into the pulper or added before and / or after the vertical sizer.
Geeignete synthetische Leimungsmittel zur Herstellung des erfindungsgemäßen Schleifrohpapiers sind zum Beispiel Styrol-Acrylsäureester-Copolymere, Acrylnitril-Acrylsäureester-Copolymere, Mischungen aus Alkyldiketen und Acrylsäureester-Copolymeren, Styrol-Acrylsäureester-Copolymere, Acrylsäureester-Copolymere oder Mischungen daraus. Die synthetischen Leimungsmittel können nichtionisch, anionisch, kationisch oder amphoter sein.Suitable synthetic sizing agents for producing the inventive abrasive base paper are, for example, styrene-acrylic acid ester copolymers, acrylonitrile-acrylic acid ester copolymers, mixtures of alkyldiketene and acrylic ester copolymers, styrene-acrylic acid ester copolymers, acrylic ester copolymers or mixtures thereof. The synthetic sizing agents may be nonionic, anionic, cationic or amphoteric.
Besonders bei der Verwendung anionischer synthetischer Leimungsmittel kann es notwendig sein, einen kationischen Polyelektrolyten als Retentionsmittel mit einzusetzen, damit das anionische, synthetische Leimungsmittel an die ebenfalls anionische Zellulosefaser gebunden wird. Geeignete Retentionsmittel sind z.B. Bentonite, Polyacrylamide, Polyethylenimine, Polyvinylamine oder Mischungen daraus.Especially when anionic synthetic sizing agents are used, it may be necessary to use a cationic polyelectrolyte as a retention agent to bind the anionic synthetic sizing agent to the likewise anionic cellulose fiber. Suitable retention aids are, for example, bentonites, polyacrylamides, Polyethyleneimines, polyvinylamines or mixtures thereof.
Zusätzlich können dem Papierstoff bei Bedarf noch weitere, in der Papierherstellung übliche Hilfsstoffe, wie zum Beispiel Nassfestmittel, Füllstoffe, Fixiermittel und/oder Farben zugegeben werden.In addition, the paper stock can be further added, if necessary, further customary in papermaking auxiliaries, such as wet strength agents, fillers, fixing agents and / or colors.
Die Herstellung des Schleifrohpapiers aus dem Papierstoff, der synthetisches Leimungsmittel enthält, erfolgt nach dem bekannten Stand der Technik, wobei der Papierstoff mit den zur Herstellung von Schleifrohpapier üblichen Mahlaggregaten nicht oder nur sehr gering gemahlen wird. Das so hergestellte Schleifrohpapier hat eine Flächenmasse von 100 - 300 g/m2, bevorzugt von 120 - 280 g/m2 und besonders bevorzugt von 120 - 260 g/m2, eine Saughöhe in Längsrichtung von 2 - 70 mm, bevorzugt von 3 - 65 mm und besonders bevorzugt von 5 - 60 mm, eine Porosität von 40 - 70%, bevorzugt von 45 - 70 % und besonders bevorzugt von 50 - 70%, eine Dicke von 0,20 - 1,00 mm, bevorzugt von 0,20 - 0,90 mm und besonders bevorzugt von 0,20 - 0,80 mm, eine Bruchkraft trocken in Längsrichtung von 50 - 500 N/15mm, bevorzugt von 60 - 450 N/15mm, besonders bevorzugt von 70 - 420 N/15mm, eine Bruchkraft trocken in Querrichtung von 25 - 250 N/15mm, bevorzugt von 30 - 225 N/15mm, besonders bevorzugt von 35 - 210 N/15mm, eine Dehnung trocken in Längsrichtung von 1,0 - 4,0 %, bevorzugt von 1,5 - 3,5 %, besonders bevorzugt von 1,5 - 3,0 %, eine Dehnung trocken in Querrichtung von 1,0 - 7,0 %, bevorzugt von 1,5 - 6,5 %, besonders bevorzugt von 1,5 - 6,0 %, eine Weiterreißfestigkeit nach Elmendorf in Querrichtung von 1000 - 4000 mN, bevorzugt von 1200 - 3500 mN, besonders bevorzugt von 1500 - 3000 mN, eine Biegesteifigkeit in Längsrichtung von 3,0 - 9,00 Nmm, bevorzugt von 3,50 - 8,50 Nmm, besonders bevorzugt von 4,00 - 8,50 Nmm, eine Biegesteifigkeit in Querrichtung von 1,50 - 5,00 Nmm, bevorzugt von 1, 75 - 4,50 Nmm, besonders bevorzugt von 1,75 - 4,00 Nmm, einen Zugsteifigkeitsindex in Längsrichtung von 2,0 - 7,0 MNm/kg, bevorzugt von 2,5 - 6,5 MNm/kg, besonders bevorzugt von 3,0 - 6,0 MNm/kg, einen Zugsteifigkeitsindex in Querrichtung von 0,5 - 4,0 MNm/kg, bevorzugt von 1,0 - 4,0 MNm/kg, besonders bevorzugt von 1,5 - 4,0 MNm/kg, ein Elastizitätsmodul in Längsrichtung von 2000 - 6000 MPa, bevorzugt von 2500 - 5500 MPa, besonders bevorzugt von 2500 - 5000 MPa und ein Elastizitätsmodul in Querrichtung von 1000 - 3000 MPa, bevorzugt von 1200 - 2500 MPa, besonders bevorzugt von 1200 - 2000 MPa.The preparation of the abrasive base paper from the paper stock, which contains synthetic sizing agent, takes place according to the known state of the art, wherein the paper stock is not ground or only very slightly ground with the grinding units customary for the production of non-wovens. The abrasive base paper thus produced has a basis weight of 100-300 g / m 2 , preferably 120-280 g / m 2 and particularly preferably 120-260 g / m 2 , a suction height in the longitudinal direction of 2-70 mm, preferably of 3 - 65 mm and more preferably from 5 - 60 mm, a porosity of 40 - 70%, preferably from 45 - 70% and particularly preferably from 50 - 70%, a thickness of 0.20 - 1.00 mm, preferably from 0 , 20-0.90 mm and more preferably from 0.20-0.80 mm, a breaking force dry in the longitudinal direction of 50-500 N / 15 mm, preferably 60-450 N / 15 mm, particularly preferably 70-420 N / 15 mm, a dry transverse tensile strength of 25-250 N / 15 mm, preferably 30-225 N / 15 mm, more preferably 35-210 N / 15 mm, a dry elongation in the longitudinal direction of 1.0-4.0%, preferably from 1.5 to 3.5%, more preferably from 1.5 to 3.0%, an elongation dry in the transverse direction of from 1.0 to 7.0%, preferably from 1.5 to 6.5%, more preferably from 1.5 to 6.0%, a tear propagation na ch Elmendorf in the transverse direction of 1000-4000 mN, preferably from 1200-3500 mN, particularly preferably from 1500-3000 mN, a bending stiffness in the longitudinal direction of 3.0-9.00 Nmm, preferably from 3.50 to 8.50 Nmm, particularly preferably from 4.00 to 8.50 Nmm, a bending stiffness in the transverse direction of from 1.50 to 5.00 Nmm, preferably from 1.75 to 4.50 Nmm, particularly preferably from 1.75 to 4.00 Nmm, a tensile stiffness index in the longitudinal direction of 2.0 to 7.0 MNm / kg, preferably from 2.5 to 6.5 MNm / kg, particularly preferably from 3.0 to 6.0 MNm / kg, a transverse tensile stiffness index of 0.5 - 4.0 MNm / kg, preferably 1.0 - 4.0 MNm / kg, more preferably 1.5 - 4.0 MNm / kg, a longitudinal elastic modulus from 2000 to 6000 MPa, preferably from 2500 to 5500 MPa, more preferably from 2500 to 5000 MPa and a modulus of elasticity in the transverse direction of 1000 to 3000 MPa, preferably from 1200 to 2500 MPa, particularly preferably from 1200 to 2000 MPa.
Unter Längsrichtung ist die unter Papiermachern übliche Bezeichnung für die Laufrichtung des Papiers durch die Papiermaschine zu verstehen. Querrichtung bezeichnet demzufolge die Richtung im 90° Winkel quer zur Laufrichtung des Papiers.The longitudinal direction is understood to mean the paper maker's usual designation for the running direction of the paper through the paper machine. Transverse direction therefore refers to the direction at 90 ° angle across the direction of the paper.
Das Schleifrohpapier wird anschließend imprägniert. Das heißt, das Papier wird mit einem Imprägniermittel durchtränkt. Eine Imprägnierung durchdringt das gesamte Schleifrohpapier gleichmäßig und unterscheidet sich somit von einer nur oberflächlich aufgebrachten Beschichtung. Die Imprägnierung ist notwendig, um dem erfindungsgemäßen Schleifrohpapier die nötige Festigkeit und Flexibilität zu geben, einen nicht saugfähigen Untergrund für die späteren Beschichtungen zu schaffen und die einzelnen Fasern so stark miteinander zu verkleben, dass die in einem späteren Arbeitsgang aufgebrachten Schleifkörner nicht auf Grund zu schwacher Faser - Faser - Bindungen während der Anwendung von der Oberfläche des erfindungsgemäßen Schleifpapiers ausreißen.The abrasive base paper is then impregnated. That is, the paper is impregnated with an impregnating agent. An impregnation penetrates the entire abrasive base paper evenly and thus differs from a superficially applied coating. The impregnation is necessary in order to give the inventive abrasive base paper the necessary strength and flexibility, to create a non-absorbent substrate for the subsequent coatings and to glue the individual fibers together so strongly that the abrasive grains applied in a subsequent operation are not too weak Fiber-to-fiber bonds during application tear from the surface of the abrasive paper according to the invention.
Vollgeleimte Papiere werden durch die wasserabstoßende Wirkung des Leimungsmittels von wässrigen Imprägniermitteln nicht gleichmäßig durchtränkt. Das Imprägniermittel bleibt bei vollgeleimten Papieren hauptsächlich an den beiden Oberflächen des Papierträgers und dringt nicht in die Tiefe des Papierträgers ein. Die Imprägnierung wirkt bei geleimten Papieren wie eine beidseitige Beschichtung. Der Fachmann hätte bei einem teilgeleimten Papierträger einen ähnlichen Effekt erwartet wie bei einem vollgeleimten Papierträger. Zur Überraschung der Erfinder hat sich aber gezeigt, dass mit der erfindungsgemäßen Teilleimung eine vollständige und gleichmäßige Durchdringung des erfindungsgemäßen Schleifrohpapiers mit wässrigen Imprägniermitteln stattfindet. Dies lässt sich an Hand der Spaltfestigkeit sehr gut nachweisen. Die Spaltfestigkeit misst die Faser-Faserbindung senkrecht zur Oberfläche des Papierträgers. Imprägnierte Papierträger, bei denen das Imprägniermittel nur an der Oberfläche des Papierträgers konzentriert ist, haben eine Spaltfestigkeit, die der des nicht imprägnierten Papierträgers entspricht, während Papierträger, die vollständig mit Imprägniermittel durchtränkt sind, eine deutlich höhere Spaltfestigkeit aufweisen. Die Spaltfestigkeit, gemessen in Querrichtung, für das erfindungsgemäße imprägnierte Schleifrohpapier liegt bei 1,5 - 6,0 N/25mm, bevorzugt 1,8 - 5,5 N/25mm und besonders bevorzugt 2,0 - 5,0 N/25mm. Nicht imprägnierte Schleifrohpapiere haben üblicherweise eine Spaltfestigkeit in Querrichtung von 1,3 - 1,5 N/25mm.Fully glued papers are not uniformly soaked by the water-repellent effect of the sizing agent of aqueous impregnating agents. The impregnating agent remains mainly on the two surfaces of the paper carrier with vollgeleimten papers and does not penetrate into the depth of the paper carrier. The impregnation acts on glued papers like a double-sided coating. A person skilled in the art would have expected a partially glued paper carrier to have a similar effect to a fully glued paper carrier. To the surprise of the inventors, however, it has been shown that with the partial sizing according to the invention a complete and uniform penetration of the inventive abrasive raw paper with aqueous impregnating agents takes place. This can be demonstrated very well on the basis of the gap strength. The nip strength measures the fiber-fiber bond perpendicular to the surface of the paper carrier. Impregnated paper supports in which the impregnant is concentrated only on the surface of the paper support have a nip strength equivalent to that of the unimpregnated paper support, while paper supports completely saturated with impregnant have a significantly higher nip strength. The gap strength, measured in the transverse direction, for the inventive impregnated abrasive base paper is 1.5-6.0 N / 25 mm, preferably 1.8-5.5 N / 25 mm and particularly preferably 2.0-5.0 N / 25 mm. Non-impregnated abrasive base papers usually have a transverse splitting strength of 1.3-1.5 N / 25 mm.
Durch die gleichmäßige Imprägniermittelaufnahme werden alle Fasern im Papierträger miteinander verklebt. Dadurch wird eine sehr hohe Faser-Faser-Bindung erreicht, die wiederum eine hohe Festigkeit des Schleifrohpapiers bewirkt. Deshalb kann auf eine Mahlung der eingesetzten Fasern weitgehend verzichtet werden. Papiere aus ungemahlenen oder schwachgemahlenen Fasern sind sehr weich und flexibel. Eine ähnliche Festigkeit kann auch durch die Erhöhung der Faseroberflächen durch starkes Mahlen und anschließendes Verpressen der Fasern unter hohen Drücken erreicht werden. So hergestellte Papiere sind aber sehr hart und steif. Der Vorteil der gleichmäßigen Verteilung des wässrigen Imprägniermittels im erfindungsgemäßen Schleifrohpapier liegt daher in einer hohen Festigkeit bei gleichzeitig hoher Flexibilität und Weichheit. Flexibilität und Weichheit lassen sich durch die Zugsteifigkeit bzw. den Zugsteifigkeitsindex und den Elastizitätsmodul nach DIN ISO 1924-3 beschreiben.Due to the uniform impregnation agent absorption all fibers in the paper carrier are glued together. As a result, a very high fiber-fiber bond is achieved, which in turn causes a high strength of the abrasive base paper. Therefore, grinding of the fibers used can largely be dispensed with. Papers made from unmilled or slightly milled fibers are very soft and flexible. Similar strength can also be achieved by increasing the fiber surfaces by heavy grinding and then pressing the fibers under high pressures. However, papers made in this way are very hard and stiff. The advantage of the uniform distribution of the aqueous impregnating agent in the abrasive base paper according to the invention is therefore high strength combined with high flexibility and softness. Flexibility and softness can be described by the tensile stiffness or the tensile stiffness index and the modulus of elasticity according to DIN ISO 1924-3.
Geeignete Imprägniermittel für die Herstellung des erfindungsgemäßen Schleifrohpapiers sind Polymerdispersionen, Polymerlösungen oder Mischungen daraus.Suitable impregnating agents for the production of the abrasive base paper according to the invention are polymer dispersions, polymer solutions or mixtures thereof.
Als Polymerdispersionen kommen zum Beispiel wässrige Dispersionen aus Acrylsäureestern, Polyvinylacetat, Acrylnitril-Butadien-Kautschuk, Acrylsäureester-Styrol-Copolymere, Ethylen-Vinylacetat-Copolymere, Styrol-Butadien-Kautschuk, Phenolharz, Epoxidharz, Naturkautschuk oder Mischungen daraus in Frage.Suitable polymer dispersions are, for example, aqueous dispersions of acrylic esters, polyvinyl acetate, acrylonitrile-butadiene rubber, acrylate-styrene copolymers, ethylene-vinyl acetate copolymers, styrene-butadiene rubber, phenolic resin, epoxy resin, natural rubber or mixtures thereof.
Geeignete Polymerlösungen sind z.B. Polyvinylalkohol in Wasser, Stärke in Wasser, Melamin-Formaldehyd-Harz in Wasser, Harnstoff-Formaldehyd-Harz in Wasser oder Mischungen daraus.Suitable polymer solutions include polyvinyl alcohol in water, starch in water, melamine-formaldehyde resin in water, urea-formaldehyde resin in water or mixtures it.
Ein erfindungsgemäß besonders geeignetes Imprägniermittel ist eine wässrige Sytrol-Butadien-Kautschuk-Dispersion mit einer Glasübergangstemperatur zwischen -30 °C und +20 °C. Die Imprägniermittelmenge liegt zwischen 5 Gew.% und 20 Gew.%, bevorzugt zwischen 10 Gew.% und 15 Gew.% der trockenen Dispersion bezogen auf das Gewicht des zu imprägnierenden Papiers.A particularly suitable impregnating agent according to the invention is an aqueous Sytrol-butadiene rubber dispersion having a glass transition temperature between -30 ° C and +20 ° C. The amount of impregnating agent is between 5% by weight and 20% by weight, preferably between 10% by weight and 15% by weight, of the dry dispersion, based on the weight of the paper to be impregnated.
In einer speziellen Ausführungsform des Schleifrohpapiers ist auf einer Seite des imprägnierten Papiers ein Sperrstrich aufgetragen. Dieser Sperrstrich kann beispielsweise durch Aufbringen einer wässrigen Dispersion auf der Basis Acrylsäureestern, Polyvinylacetat, Acrylnitril-Butadien-Kautschuk, Acrylsäureester-Styrol-Copolymere, Ethylen-Vinylacetat-Copolymere, Styrol-Butadien-Kautschuk, Phenolharz, Epoxydharz, Naturkautschuk oder Mischungen daraus hergestellt werden. Die Auftragsmenge nach dem Trocknen beträgt 2 - 15 g/m2, bevorzugt 3 - 12 g/m2.In a specific embodiment of the abrasive base paper, a barrier coat is applied to one side of the impregnated paper. This barrier coat can be prepared, for example, by applying an aqueous dispersion based on acrylic acid esters, polyvinyl acetate, acrylonitrile-butadiene rubber, acrylic ester-styrene copolymers, ethylene-vinyl acetate copolymers, styrene-butadiene rubber, phenolic resin, epoxy resin, natural rubber or mixtures thereof , The amount applied after drying is 2 - 15 g / m 2 , preferably 3 - 12 g / m 2 .
Sowohl dem Imprägniermittel als auch dem Sperrstrich können noch verschiedene Additive und/oder Füllstoffe zugegeben werden. Beispiele für Additive sind Farben, Vernetzer, Hydrophobierungsmittel, Oleophobierungsmittel, Hydrophilierungsmittel, antistatisch wirkende Mittel oder Mischungen daraus. Als Füllstoffe kann z.B. Kaolin, Titandioxid, Talkum, Kalziumkarbonat, Siliziumdioxid, Bentonite oder Mischungen daraus eingesetzt werden.Both the impregnating agent and the barrier can still be added various additives and / or fillers. Examples of additives are paints, crosslinking agents, water repellents, oil repellents, hydrophilicizing agents, antistatic agents or mixtures thereof. As fillers, e.g. Kaolin, titanium dioxide, talc, calcium carbonate, silica, bentonites or mixtures thereof.
Die Imprägnierung des Schleifrohpapiers und Beschichtung des imprägnierten Schleifrohpapiers können entweder innerhalb der Papiermaschine oder außerhalb in einer eigens dafür entworfenen Imprägnier- und Beschichtungsmaschine geschehen. Geeignete Imprägnierverfahren sind zum Beispiel Leimpresse, Tauchimprägnierung, Schaumimprägnierung, Walzenimprägnierung oder Aufsprühen. Geeignete Beschichtungsverfahren sind zum Beispiel Rollrakel, Messerrakel, Luftbürste oder Walzenauftrag.The impregnation of the abrasive base paper and coating of the impregnated abrasive base paper can either inside the paper machine or outside in one specially designed impregnation and coating machine happen. Suitable impregnation methods are, for example, size press, dip impregnation, foam impregnation, roll impregnation or spraying. Suitable coating methods are, for example, roller blade, knife blade, air brush or roller application.
Zur Steigerung der Oberflächenglätte und der Flexibilität kann das imprägnierte und gegebenenfalls mit Sperrstrich beschichtete Schleifrohpapier kalandriert werden. Bevorzugt läuft das erfindungsgemäße imprägnierte Schleifrohpapier dabei durch den Spalt eines Walzenpaares, bestehend aus einer Stahl- und einer Gummiwalze, mit einem Spaltdruck von 30 bis 300 N/mm, bevorzugt von 50 bis 250 N/15mm. Ist das erfindungsgemäße imprägnierte Schleifrohpapier mit einem Sperrstrich beschichtet, so wird es in der Weise dem Kalander zugeführt, dass die Seite mit dem Sperrstrich mit der Stahlwalze in Berührung kommt. Die Kalandertemperatur liegt zwischen 20° und 80°C, bevorzugt zwischen 50 und 70 °C.To increase the surface smoothness and the flexibility, the impregnated and possibly coated with barrier coating abrasive base paper can be calendered. The impregnated abrasive base paper according to the invention preferably passes through the nip of a pair of rolls consisting of a steel roll and a rubber roll with a nip pressure of from 30 to 300 N / mm, preferably from 50 to 250 N / 15 mm. If the impregnated abrasive base paper according to the invention is coated with a barrier coating, it is fed to the calender in such a way that the side comes into contact with the barrier coating with the steel roll. The calendering temperature is between 20 ° and 80 ° C, preferably between 50 and 70 ° C.
Das erfindungsgemäße imprägnierte und kalandrierte Schleifrohpapier hat eine Flächenmasse von 110 - 360 g/m2, bevorzugt von 120 - 340 g/m2 und besonders bevorzugt von 130 - 310 g/m2, eine Dicke von 0,14 - 0,90 mm, bevorzugt von 0,15 - 0,80 mm und besonders bevorzugt von 0,16 - 0,70 mm, eine Porosität von 20 - 70%, bevorzugt von 20- 60 % und besonders bevorzugt von 20 - 50%, eine Bruchkraft trocken in Längsrichtung von 150 - 550 N/15mm, bevorzugt von 170 - 500 N/15mm, besonders bevorzugt von 180 - 450 N/15mm, eine Bruchkraft trocken in Querrichtung von 80 - 300 N/15mm, bevorzugt von 90 - 280 N/15mm, besonders bevorzugt von 100 - 270 N/15mm, eine Dehnung trocken in Längsrichtung von 1,0 - 5,0 %, bevorzugt von 1,1 - 4,8 %, besonders bevorzugt von 1,2 - 4,5 %, eine Dehnung trocken in Querrichtung von 2,0 - 9,0 %, bevorzugt von 2,5 - 8,7 %, besonders bevorzugt von 2,8 - 8,5 %, eine Weiterreißfestigkeit nach Elmendorf in Querrichtung von 800 - 3000 mN, bevorzugt von 1000 - 2700 mN, besonders bevorzugt von 1200 - 2500 mN, eine Biegesteifigkeit in Längsrichtung von 2,0 - 8,0 Nmm, bevorzugt von 2,5 - 7,7 Nmm, besonders bevorzugt von 2,8 - 7,5 Nmm, eine Biegesteifigkeit in Querrichtung von 1,0 - 5,0 Nmm, bevorzugt von 1,1 - 4,8 Nmm, besonders bevorzugt von 1,2 - 4,5 Nmm, einen Zugsteifigkeitsindex in Längsrichtung von 2,0 - 7,0 MNm/kg, bevorzugt von 2,5 - 6,9 MNm/kg, besonders bevorzugt von 2,8 - 6,8 MNm/kg, einen Zugsteifigkeitsindex in Querrichtung von 1,0 - 7,0 MNm/kg, bevorzugt von 1,1 - 6,8 MNm/kg, besonders bevorzugt von 1,2 - 6,5 MNm/kg, ein Elastizitätsmodul in Längsrichtung von 2000 - 5500 MPa, bevorzugt von 2200 - 5300 MPa, besonders bevorzugt von 2400 - 5100 MPa, ein Elastizitätsmodul in Querrichtung von 800 - 3500 MPa, bevorzugt von 1000 - 3200 MPa, besonders bevorzugt von 1200 - 3000 MPa, eine Oberflächenglätte nach Bekk auf der glatteren Seite von 5 - 50 s, bevorzugt von 5 - 45 s, besonders bevorzugt von 5 - 40 s.The impregnated and calendered abrasive base paper according to the invention has a basis weight of 110-360 g / m 2 , preferably of 120-340 g / m 2 and more preferably of 130-310 g / m 2 , a thickness of 0.14-0.90 mm , preferably from 0.15 to 0.80 mm and more preferably from 0.16 to 0.70 mm, a porosity of from 20 to 70%, preferably from 20 to 60% and particularly preferably from 20 to 50%, a breaking force dry in the longitudinal direction of 150-550 N / 15mm, preferably 170-500 N / 15mm, more preferably 180-450 N / 15mm, dry ultimate tensile strength of 80-300 N / 15mm, preferably 90-280 N / 15mm , more preferably from 100 to 270 N / 15mm, an elongation dry in Lengthwise from 1.0 to 5.0%, preferably from 1.1 to 4.8%, more preferably from 1.2 to 4.5%, dry to transverse elongation from 2.0 to 9.0%, preferably from 2.5 to 8.7%, more preferably from 2.8 to 8.5%, a tear strength according to Elmendorf in the transverse direction of 800 to 3000 mN, preferably from 1000 to 2700 mN, particularly preferably from 1200 to 2500 mN, a Bending stiffness in the longitudinal direction of 2.0-8.0 Nmm, preferably 2.5-7.7 Nmm, more preferably 2.8-7.5 Nmm, a bending stiffness in the transverse direction of 1.0-5.0 Nmm, preferably from 1.1 to 4.8 Nmm, more preferably from 1.2 to 4.5 Nmm, a tensile stiffness index in the longitudinal direction of 2.0 to 7.0 MNm / kg, preferably from 2.5 to 6.9 MNm / kg, more preferably from 2.8 to 6.8 MNm / kg, a transverse tensile stiffness index of 1.0 to 7.0 MNm / kg, preferably 1.1 to 6.8 MNm / kg, more preferably 1, 2-6.5 MNm / kg, a modulus of elasticity in the longitudinal direction of 2000-5500 MPa, preferably 2200-5300 MPa, especially bevo R ranges from 2400 to 5100 MPa, a modulus of elasticity in the transverse direction of 800-3500 MPa, preferably from 1000 to 3200 MPa, more preferably from 1200 to 3000 MPa, a Bekk smoothness on the smoother side of 5 to 50 s, preferably of 5. 45 s, more preferably from 5 to 40 s.
Das erfindungsgemäße imprägnierte, mit Sperrstrich beschichtete und kalandrierte Schleifrohpapier hat eine Flächenmasse von 115 - 370 g/m2, bevorzugt von 125 - 350 g/m2 und besonders bevorzugt von 135 - 320 g/m2, eine Dicke von 0,15 - 0,90 mm, bevorzugt von 0,16 - 0,80 mm und besonders bevorzugt von 0,17 - 0,70 mm, eine Porosität von 20 - 70%, bevorzugt von 20 - 60 % und besonders bevorzugt von 20 - 50%, eine Bruchkraft trocken in Längsrichtung von 150 - 550 N/15mm, bevorzugt von 170 - 500 N/15mm, besonders bevorzugt von 180 - 450 N/15mm, eine Bruchkraft trocken in Querrichtung von 80 - 300 N/15mm, bevorzugt von 90 - 280 N/15mm, besonders bevorzugt von 100 - 270 N/15mm, eine Dehnung trocken in Längsrichtung von 1,0 - 5,0 %, bevorzugt von 1,1 - 4,8 %, besonders bevorzugt von 1,2 - 4,5 %, eine Dehnung trocken in Querrichtung von 2,0 - 9,0 %, bevorzugt von 2,5 - 8,7 %, besonders bevorzugt von 2,8 - 8,5 %, eine Weiterreißfestigkeit nach Elmendorf in Querrichtung von 800 - 3000 mN, bevorzugt von 1000 - 2700 mN, besonders bevorzugt von 1200 - 2500 mN, eine Biegesteifigkeit in Längsrichtung von 2,0 - 8,0 Nmm, bevorzugt von 2,5 - 7,7 Nmm, besonders bevorzugt von 2,8 - 7,5 Nmm, eine Biegesteifigkeit in Querrichtung von 1,0 - 5,0 Nmm, bevorzugt von 1,1 - 4,8 Nmm, besonders bevorzugt von 1,2 - 4,5 Nmm, einen Zugsteifigkeitsindex in Längsrichtung von 2, 0 - 7,0 MNm/kg, bevorzugt von 2,5 - 6,9 MNm/kg, besonders bevorzugt von 2,8 - 6,8 MNm/kg, einen Zugsteifigkeitsindex in Querrichtung von 1,0 - 7,0 MNm/kg, bevorzugt von 1,1 - 6,8 MNm/kg, besonders bevorzugt von 1,2 - 6,5 MNm/kg, ein Elastizitätsmodul in Längsrichtung von 2000 - 5500 MPa, bevorzugt von 2200 - 5300 MPa, besonders bevorzugt von 2400 - 5100 MPa, ein Elastizitätsmodul in Querrichtung von 800 - 3500 MPa, bevorzugt von 1000 - 3200 MPa, besonders bevorzugt von 1200 - 3000 MPa, eine Oberflächenglätte nach Bekk auf der Sperrstrichseite von 40 - 400 s, bevorzugt von 45 - 370 s, besonders bevorzugt von 50 - 350 s.The impregnated, barrier-coated and calendered abrasive paper according to the invention has a basis weight of from 115 to 370 g / m 2 , preferably from 125 to 350 g / m 2 and particularly preferably from 135 to 320 g / m 2 , a thickness of 0.15. 0.90 mm, preferably 0.16-0.80 mm and more preferably 0.17-0.70 mm, a porosity of 20-70%, preferably 20-60% and particularly preferably 20-50% , a breaking force dry in the longitudinal direction of 150-550 N / 15mm, preferably 170-500 N / 15mm, more preferably 180-450 N / 15mm, a transverse dry tensile strength of 80-300 N / 15mm, preferably 90-280 N / 15mm, more preferably from 100 to 270 N / 15mm, an elongation dry in the longitudinal direction of 1.0 to 5.0%, preferably 1.1 to 4.8%, more preferably 1.2 to 4.5%, an elongation dry in Transverse direction from 2.0 to 9.0%, preferably from 2.5 to 8.7%, particularly preferably from 2.8 to 8.5%, a tear propagation resistance according to Elmendorf in the transverse direction of 800 to 3000 mN, preferably of 1000 2700 mN, more preferably from 1200 to 2500 mN, a bending stiffness in the longitudinal direction of 2.0 to 8.0 Nmm, preferably from 2.5 to 7.7 Nmm, particularly preferably from 2.8 to 7.5 Nmm, a flexural rigidity in the transverse direction from 1.0 to 5.0 Nmm, preferably from 1.1 to 4.8 Nmm, more preferably from 1.2 to 4.5 Nmm, a longitudinal tensile stiffness index of 2.0 to 7.0 MNm / kg , preferably from 2.5 to 6.9 MNm / kg, more preferably from 2.8 to 6.8 MNm / kg, a transverse tensile stiffness index of 1.0-7.0 MNm / kg, preferably 1.1-6.8 MNm / kg, more preferably 1.2-6.5 MNm / kg, a modulus of elasticity in the longitudinal direction from 2000 to 5500 MPa, preferably from 2200 to 5300 MPa, more preferably from 2400 to 5100 MPa, a modulus of elasticity in the transverse direction of 800 to 3500 MPa, preferably from 1000 to 3200 MPa, particularly preferably from 1200 to 3000 MPa, a Bekk surface smoothness on the barrier side of 40-400 s, preferably 45-370 s, particularly preferably 50-350 s.
Zur Herstellung des Schleifpapiers wird das erfindungsgemäße imprägnierte und kalandrierte Schleifrohpapier noch besandet. Unter Besanden versteht man das Aufbringen eines Grundlacks auf das erfindungsgemäße Schleifrohpapier, das anschließende Aufstreuen des Schleifkorns, das Trocknen des Grundlacks, das Aufbringen eines Decklacks auf das Schleifkorn und die endgültige Trocknung des Decklacks. Der Grundlack besteht z. B. aus Epoxidharz, Phenolharz, Alkydharz, Ureaharz oder Mischungen daraus. Die Harze werden in einem geeigneten Lösemittel dispergiert und auf das Schleifrohpapier aufgetragen. Besitzt das imprägnierte Schleifrohpapier einen Sperrstrich, so wird der Grundlack auf dem Sperrstrich aufgebracht. Die Schleifkörner werden dann auf den noch nassen Grundlack aufgestreut, wobei die einzelnen Körner durch elektrostatische Vorrichtungen auf dem Schleifrohpapier optimal ausgerichtet werden. Anschließend läuft das mit dem nassen Grundlack und dem darauf haftenden Schleifkörnern beschichtete Schleifrohpapier in einen Trockenofen, in dem der Grundlack getrocknet wird. Nach der Trocknung erfolgt die Beschichtung der Schleifkörner mit dem Decklack. Der Decklack ist für gewöhnlich ein hartes, duroplastisch härtendes Harz, das die Schleifkörner zusätzlich auf dem Schleifpapier verankert. Abgeschlossen wird die Besandung durch das Aushärten des Grund- und Decklackes. Anwendung findet das erfindungsgemäße Schleifpapier als Schleifscheiben, Schleifbänder und bogenförmige Schleifartikel.To produce the abrasive paper, the impregnated and calendered base paper according to the invention is still sanded. Besanden is understood to mean the application of a base coat to the inventive abrasive base paper which then sprinkling the abrasive grain, drying the base coat, applying a top coat to the abrasive grain, and finally drying the top coat. The base coat consists z. Example of epoxy resin, phenolic resin, alkyd resin, urea resin or mixtures thereof. The resins are dispersed in a suitable solvent and applied to the abrasive base paper. If the impregnated abrasive base paper has a stop line, the base coat is applied to the barrier line. The abrasive grains are then sprinkled onto the still-wet basecoat, the individual grains being optimally aligned by electrostatic devices on the abrasive base paper. Subsequently, the abrasive base paper coated with the wet base coat and the abrasive grains adhering thereto runs in a drying oven in which the base coat is dried. After drying, the abrasive grains are coated with the topcoat. The topcoat is usually a hard, thermosetting resin which additionally anchors the abrasive grains on the sandpaper. The sanding is completed by the hardening of the primer and topcoat. The abrasive paper according to the invention is used as grinding wheels, abrasive belts and bow-shaped abrasive articles.
Dicke nach DIN EN ISO 534 mit 20 N Auflagedruck und einer Messfläche von 200 mm2
Bruchkraft trocken in Längs- und Querrichtung nach DIN EN ISO 1924-2, Streifenbreite 15 mm, Einspannlänge 100mm, Abzugsgeschwindigkeit 150 mm/min
Bruchdehnung trocken in Längs- und Querrichtung nach DIN
EN ISO 1924-2, Streifenbreite 15 mm, Einspannlänge 100mm, Abzugsgeschwindigkeit 150 mm/min
Saughöhe in Längsrichtung nach DIN ISO 8787
Durchreisswiderstand nach Elmendorf in Querrichtung nach DIN EN 21974 mit einem Probenpaket aus 2 Papierblättern Glätte nach Bekk nach DIN 53107
Biegesteifigkeit in Längs- und Querrichtung nach DIN 53123 Teil 1
Zugsteifigkeitsindex in Längs- und Querrichtung nach DIN ISO 1924-3 mit 150 mm/min Dehngeschwindigkeit
Elastizitätsmodul in Längs- und Querrichtung nach DIN ISO 1924-3 mit 150 mm/min DehngeschwindigkeitThickness according to DIN EN ISO 534 with 20 N contact pressure and a measuring surface of 200 mm 2
Breaking force dry in longitudinal and transverse direction according to DIN EN ISO 1924-2, strip width 15 mm, clamping length 100 mm, take-off speed 150 mm / min
Elongation at break dry in longitudinal and transverse direction according to DIN
EN ISO 1924-2, strip width 15 mm, clamping length 100 mm, take-off speed 150 mm / min
Suction head lengthwise to DIN ISO 8787
Tearing resistance to Elmendorf in transverse direction according to DIN EN 21974 with a sample package of 2 sheets of paper Smoothing according to Bekk according to DIN 53107
Bending stiffness in longitudinal and transverse direction according to DIN 53123 Part 1
Tensile stiffness index in longitudinal and transverse direction according to DIN ISO 1924-3 with a speed of 150 mm / min
Modulus of elasticity in longitudinal and transverse direction according to DIN ISO 1924-3 with a speed of 150 mm / min
Aus einem vorher 24 Stunden bei 23°C und 50 % relativer Luftfeuchtigkeit klimatisiertem Schleifrohpapiermuster werden 2 Streifen mit 50 mm Breite und 200 mm Länge geschnitten. Die 200 mm lange Seite verläuft dabei quer zur Laufrichtung des Papiers. Auf die Vorder- und Rückseite dieser Muster werden dann ca. 150 mm lange Streifen des Testklebebandes Scotch 3M 365 faltenfrei so aufgeklebt, dass an einem Ende das Papier um ca. 50 mm übersteht. Dieser Verbund wird dann anschließend mit einer 4,5 kg schweren und 50 mm breiten Stahlwalze verpresst. Dabei wird die Stahlwalze ohne zusätzlichen Druck per Hand zweimal über den Verbund gerollt. Aus jedem Streifen, bestehend aus dem Schleifrohpapiermuster und dem Testklebeband auf beiden Seiten des Papiers, wird eine Probe mit 25 mm Breite und 200 mm Länge zugeschnitten. Von dem Ende her, an der das Papier übersteht, wird auf einer Seite das Klebeband mit der Hand ein kurzes Stück weit abgezogen, so dass das Papier über die ganze Breite der Probe aufgespalten wird. Bevorzugt wird die Aufspaltung auf der Papierseite durchgeführt, auf der das Testklebeband am stärksten haftet. Je nach Beschichtung des Papiers kann es vorkommen, dass das Aufspalten Schwierigkeiten bereitet. Bei schlechter Haftung des Testklebebands auf dem zu prüfenden Schleifrohpapiers und bei sehr hoher Spaltfestigkeit muss das zu prüfende Schleifrohpapier mit einer Rasierklinge vorsichtig eingeschnitten und dann mit Hilfe des Testklebebandes weiter gespalten werden. Die Messung der Spaltfestigkeit erfolgt in einer Universalprüfmaschine der Fa. Zwick Typ Roell Z 0.5 mit folgenden Einstellungen:
- Messbereich 0,5 F
- Programm Nassschleif-Spaltfestigkeit
- Geschwindigkeit 300 mm/min
- Klemmenabstand 25 mm
- Vorweg 20 mm
- Prüfstrecke 80 mm
- Das mit der Hand abgezogene Testklebeband Scotch 3M 365 wird in die obere Klemme der Zugprüfmaschine eingespannt. Das zu prüfende Schleifrohpapier mit dem darauf haftenden 2. Streifen des Testklebebandes wird so in die untere Klemme der Universalprüfmaschine eingespannt, dass der Verbund im 90°-Winkel zur Zugrichtung absteht. Während der Messung ist darauf zu achten, dass die Spaltung in der Mitte des zu prüfenden Klebebandpapiers erfolgt und nicht nur einzelne Fasern aus der Papieroberfläche gerissen werden. Messungen, bei denen die Spaltung nicht in Papiermitte erfolgt, werden verworfen und wiederholt. Gemessen wird die durchschnittliche Kraft, die benötigt wird, um das Papier zu spalten. Das Ergebnis ist der Mittelwert aus zwei Einzelmessungen
- Measuring range 0.5 F
- Program wet grinding gap strength
- Speed 300 mm / min
- Terminal distance 25 mm
- Preliminary 20 mm
- Test track 80 mm
- The Scotch 3M 365 test tape removed by hand is clamped in the upper clamp of the tensile tester. The sandpaper to be tested with the second strip of test adhesive tape adhering to it is clamped in the lower clamp of the universal testing machine in such a way that the composite protrudes at 90 ° to the pulling direction. During the measurement it must be ensured that the cleavage takes place in the middle of the tape paper to be tested and not just individual fibers are torn from the paper surface. Measurements in which the cleavage does not take place in the middle of the paper are discarded and repeated. The average force needed to split the paper is measured. The result is the mean of two individual measurements
Die Porosität des Schleifrohpapiers errechnet sich aus seiner der tatsächlichen Dichte und der theoretischen Dichte, die es ohne Lufteinschlüsse hat (= Dichte der eingesetzten Fasern) nach folgender Formel:
Claims (10)
- Impregnated raw abrasive paper produced from unrefined, or only slightly refined, fibres and having a grammage of from 110 to 360 g/m2, characterised in that the raw abrasive paper is partially sized by means of a synthetic sizing agent, the amount of sizing agent added being between 0.5 % and 3.0 %, based on the dry fibres, such that the raw abrasive paper has a capillary rise in the longitudinal direction of from 2 mm to 70 mm, and in that the raw abrasive paper is impregnated with an aqueous impregnating agent, the impregnated raw abrasive paper having a tensile stiffness index in the longitudinal direction of from 2.0 MNm/kg to 7.0 MNm/kg and a modulus of elasticity in the longitudinal direction of from 2000 to 5500 MPa.
- Impregnated raw abrasive paper according to claim 1, characterised in that the raw abrasive paper is impregnated with from 5 to 20 wt.% of the dry impregnating agent, based on the dry fibres.
- Impregnated raw abrasive paper according to either claim 1 or claim 2, characterised in that the impregnated raw abrasive paper has a Bekk smoothness on the smooth side of from 5 s to 50 s.
- Impregnated raw abrasive paper according to any of the preceding claims, characterised in that the impregnated raw abrasive paper has a barrier coat on one side.
- Impregnated raw abrasive paper according to claim 4, characterised in that the impregnated raw abrasive paper has a Bekk smoothness on the barrier-coat side of from 40 s to 400 s.
- Impregnated raw abrasive paper according to any of the preceding claims, characterised in that the impregnated raw abrasive paper is calendered.
- Raw abrasive paper comprising an impregnated raw abrasive paper according to at least one of claims 1 to 6, characterised in that it is coated on at least one side with a base coat, abrasive particles and a top coat.
- Method for producing impregnated raw abrasive paper from unrefined, or only slightly refined, fibres, characterised in that the fibres are partially sized by adding from 0.5 % to 3.0 % of a synthetic sizing agent, based on the dry fibres, such that the raw abrasive paper has a capillary rise in the longitudinal direction of from 2 mm to 70 mm, and in that the raw abrasive paper is then impregnated with an aqueous impregnating agent such that the impregnated raw abrasive paper has a tensile stiffness index in the longitudinal direction of from 2.0 MNm/kg to 7.0 MNm/kg and a modulus of elasticity in the longitudinal direction of from 2000 to 5500 MPa.
- Method according to claim 8, characterised in that a base coat, abrasive particles and a top coat are applied to the impregnated raw abrasive paper.
- Use of the impregnated raw abrasive paper according to any of claims 1 to 6 for producing abrasive discs, abrasive belts and abrasive pads.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011122012.0A DE102011122012B4 (en) | 2011-12-22 | 2011-12-22 | Impregnated abrasive base paper, process for producing impregnated abrasive base paper and its use |
PCT/EP2012/005128 WO2013091798A2 (en) | 2011-12-22 | 2012-12-12 | Impregnated abrasive base papers and abrasive papers produced therefrom |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2794991A2 EP2794991A2 (en) | 2014-10-29 |
EP2794991B1 true EP2794991B1 (en) | 2016-09-14 |
Family
ID=47469867
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12808683.2A Active EP2794991B1 (en) | 2011-12-22 | 2012-12-12 | Impregnated abrasive base papers and abrasive papers produced therefrom |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2794991B1 (en) |
DE (1) | DE102011122012B4 (en) |
WO (1) | WO2013091798A2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014006822B4 (en) * | 2014-05-08 | 2016-03-03 | Neenah Gessner Gmbh | Abrasive carrier and abrasive carrier having at least two layers of a carrier material and abrasive articles made therefrom |
EP3403765B1 (en) * | 2017-05-19 | 2022-04-13 | Hermes Schleifmittel GmbH | Composite support for an abrasive agent |
CN115338785A (en) * | 2022-08-19 | 2022-11-15 | 安徽凯耐德研磨制品有限公司 | Manufacturing method of KF powerful polishing piece |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL131830C (en) | 1956-11-23 | 1900-01-01 | ||
DE1469865A1 (en) * | 1961-01-21 | 1969-03-27 | Carborundum Co | Abrasives and process for their manufacture |
US4240807A (en) | 1976-01-02 | 1980-12-23 | Kimberly-Clark Corporation | Substrate having a thermoplastic binder coating for use in fabricating abrasive sheets and abrasive sheets manufactured therewith |
DE2621119A1 (en) * | 1976-05-13 | 1977-12-01 | Herberts & Co Gmbh Dr Kurt | Continuous cured laminate mfr. from cardboard - and melamine and polyester resins by impregnation, drying, coating, precure and shock cure |
DE2746833A1 (en) * | 1977-10-14 | 1979-04-19 | Kimberly Clark Co | Carrier for flexible abrasive papers - coated with heat-activated adhesive for the abrasive grains |
DE3541187C2 (en) * | 1985-11-21 | 1994-10-06 | Kaemmerer Gmbh | Process for producing a paper web impregnated with synthetic resins and their use |
US5622786A (en) * | 1994-11-30 | 1997-04-22 | Kimberly-Clark Corporation | Polymer-reinforced, eucalyptus fiber-containing paper |
US20060265966A1 (en) | 2005-05-24 | 2006-11-30 | Rostal William J | Abrasive articles and methods of making and using the same |
BRPI1015073A2 (en) * | 2009-05-27 | 2016-04-19 | Swetree Technologies Ab | polymer made of a functionalized polymer of primary amine and hemicellulose. |
DE102010016864B4 (en) * | 2010-05-10 | 2018-09-27 | Papierfabrik Julius Schulte Söhne GmbH & Co. KG | Fibrous core paper, process for its preparation and its use |
-
2011
- 2011-12-22 DE DE102011122012.0A patent/DE102011122012B4/en not_active Expired - Fee Related
-
2012
- 2012-12-12 WO PCT/EP2012/005128 patent/WO2013091798A2/en active Application Filing
- 2012-12-12 EP EP12808683.2A patent/EP2794991B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
DE102011122012B4 (en) | 2017-04-06 |
DE102011122012A1 (en) | 2013-06-27 |
WO2013091798A2 (en) | 2013-06-27 |
WO2013091798A3 (en) | 2013-11-28 |
EP2794991A2 (en) | 2014-10-29 |
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