EP2794991A2 - Papiers supports d'abrasif imprégnés et papiers abrasifs fabriqués à partir de ceux-ci - Google Patents

Papiers supports d'abrasif imprégnés et papiers abrasifs fabriqués à partir de ceux-ci

Info

Publication number
EP2794991A2
EP2794991A2 EP12808683.2A EP12808683A EP2794991A2 EP 2794991 A2 EP2794991 A2 EP 2794991A2 EP 12808683 A EP12808683 A EP 12808683A EP 2794991 A2 EP2794991 A2 EP 2794991A2
Authority
EP
European Patent Office
Prior art keywords
abrasive
base paper
impregnated
paper
abrasive base
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.)
Granted
Application number
EP12808683.2A
Other languages
German (de)
English (en)
Other versions
EP2794991B1 (fr
Inventor
Christine DÖGE
Peter Karl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Neenah Gessner GmbH
Original Assignee
Neenah Gessner GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Neenah Gessner GmbH filed Critical Neenah Gessner GmbH
Publication of EP2794991A2 publication Critical patent/EP2794991A2/fr
Application granted granted Critical
Publication of EP2794991B1 publication Critical patent/EP2794991B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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

  • Impregnated abrasive base papers and abrasives made therefrom are Impregnated abrasive base papers and abrasives made therefrom
  • 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 forth ⁇ made sandpaper 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 sanding and wet sanding papers. US Pat. No. 4,240,807 exemplifies the differences between these two types of abrasive paper.
  • 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 very 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 used in relation to the raw materials used for the production of sandpaper, the better the ratio between 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 rigid dry sanding paper does not distribute 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 tearing of the paper Abrasive grains at this point.
  • British Patent Specification GB 1,012,441 describes the preparation of abrasive papers of highly porous, unge ⁇ -ground base papers, the compressed between a cylinder and a rubber blanket and to be compressed.
  • 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, as they deform during the grinding organg and become unusable. Summary of the invention
  • 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 the wet grinding papers described in US 4,240,807, but are much cheaper and more environmentally friendly to produce.
  • 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.
  • Abrasives for example abrasive belts and grinding wheels, which are produced from the abrasive base paper according to the invention, have a significantly longer service life than abrasives from the known dry abrasives. sanding. 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 raw 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 from regenerated cellulose, polyester, polypropylene, polyvinyl alcohol, polyamide and multicomponent fibers.
  • Suitable inorganic fibers include 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 impregnation ⁇ mean recording in the subsequent impregnation with aqueous impregnating agents.
  • the amount of synthetic sizing agent required for partial sizing of the abrasive 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.
  • the 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.
  • 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 abrasive base paper according to the invention are, for example, styrene-acrylic acid ester copolymers, acrylonitrile-acrylic acid ester copolymers, mixtures of alkyldiketene and acrylic acid ester copolymers, styrene-acrylic acid ester copolymers, acrylic acid ester copolymers or mixtures thereof.
  • the synthetic sizing agents may be nonionic, anionic, cationic or amphoteric.
  • anionic synthetic sizing agents 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.
  • Geeig ⁇ designated retention agents are bentonite, polyacrylamide, 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
  • Nmm preferably of 1.75-4.50 Nmm, more preferably from 1.75 to 4.00 Nmm
  • the longitudinal direction is understood to mean the paper maker's usual designation for the running direction of the paper through the paper machine.
  • the transverse direction refers to the direction at an angle of 90 ° transversely to 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.
  • 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 according to the invention 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 from 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 acrylates, polyvinyl acetate, acrylonitrile-butadiene rubber, acrylate-styrene copolymers, ethylene-vinyl acetate copolymers, styrene-butadiene rubber, phenolic resin, epoxy resin, natural rubber or Mixtures thereof are produced.
  • 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, Ben-tonite 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.
  • Is according to the invention impregnated grinding ⁇ base paper coated with a locking bar, so it is supplied in the manner of the calender that the page comes to the locking bar with the steel roll in contact.
  • 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 of 2.0 to 9.0%, preferably from 2.5 to 8.7%, particularly preferably from 2.8 to 8.5%, a tear propagation to Elmendorf in the transverse direction of 800 to 3000 mN, preferably from 1000 to 2700 mN, more preferably from 1200 to 2500 mN, a tear
  • 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. Then running the paper with the wet base coat and adhering thereto abrasive grains coated Schleifroh- in a drying oven in which the base coat is getrock ⁇ net. 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. Test Methods
  • the tape is pulled by hand a short distance on one side, so that the paper is split over the entire width of the sample.
  • the splitting is performed on the paper side on which the Test tape adheres the strongest.
  • splitting may be difficult.
  • the abrasive base paper to be tested must be carefully cut with a razor blade and then further split with the aid of the test adhesive tape.
  • the measurement of the gap strength takes place in a universal testing machine from Zwick type Roell Z 0.5 with the following settings:
  • the Scotch 3M 365 test tape removed by hand is clamped in the upper clamp of the tensile tester.
  • the abrasive paper to be tested with the second strip of adhesive tape adhering to it is clamped in the lower clamp of the universal testing machine in such a way that the composite projects at 90 ° to the direction of pull Instead of just scribing individual fibers from the paper surface, measurements where the cleavage does not occur in the middle of the paper are discarded and repeated, measuring the average force needed to split the paper, and the result is the mean of two individual measurements
  • Porosity (1 - actual density [g / cm 3 ] / theoretical density [g / cm 3 ]) xl00%

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Paper (AREA)

Abstract

Un papier support d'abrasif imprégné fabriqué à partir de fibres et présentant un grammage de 110 à 360 g/m2 est partiellement encollé au moyen d'un produit d'encollage synthétique. Le produit d'encollage est ajouté en une quantité de 0,5 % à 3,0 %, ramenée aux fibres sèches, de façon que le papier support d'abrasif présente une hauteur d'ascension capillaire de 2 à 70 mm dans le sens longitudinal. Le papier support d'abrasif possède un indice de résistance à la traction dans le sens longitudinal de 2,0 à 7,0 MNm/kg et un module d'élasticité dans le sens longitudinal de 2000 à 5500 MPa.
EP12808683.2A 2011-12-22 2012-12-12 Papiers supports d'abrasif imprégnés et papiers abrasifs fabriqués à partir de ceux-ci Active EP2794991B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011122012.0A DE102011122012B4 (de) 2011-12-22 2011-12-22 Imprägniertes Schleifrohpapier, Verfahren zur Herstellung von imprägniertem Schleifrohpapier und dessen Verwendung
PCT/EP2012/005128 WO2013091798A2 (fr) 2011-12-22 2012-12-12 Papiers supports d'abrasif imprégnés et papiers abrasifs fabriqués à partir de ceux-ci

Publications (2)

Publication Number Publication Date
EP2794991A2 true EP2794991A2 (fr) 2014-10-29
EP2794991B1 EP2794991B1 (fr) 2016-09-14

Family

ID=47469867

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12808683.2A Active EP2794991B1 (fr) 2011-12-22 2012-12-12 Papiers supports d'abrasif imprégnés et papiers abrasifs fabriqués à partir de ceux-ci

Country Status (3)

Country Link
EP (1) EP2794991B1 (fr)
DE (1) DE102011122012B4 (fr)
WO (1) WO2013091798A2 (fr)

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WO2013091798A2 (fr) 2013-06-27
EP2794991B1 (fr) 2016-09-14
DE102011122012B4 (de) 2017-04-06
DE102011122012A1 (de) 2013-06-27
WO2013091798A3 (fr) 2013-11-28

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