EP3403765A1 - Couche d'adhérence pour produit abrasif - Google Patents

Couche d'adhérence pour produit abrasif Download PDF

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Publication number
EP3403765A1
EP3403765A1 EP17172052.7A EP17172052A EP3403765A1 EP 3403765 A1 EP3403765 A1 EP 3403765A1 EP 17172052 A EP17172052 A EP 17172052A EP 3403765 A1 EP3403765 A1 EP 3403765A1
Authority
EP
European Patent Office
Prior art keywords
composite
fabric
textile fabric
paper
backing
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
EP17172052.7A
Other languages
German (de)
English (en)
Other versions
EP3403765B1 (fr
Inventor
Peter PUTTRUS
Jan Petersen
Martin Reichstein
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.)
Hermes Schleifmittel GmbH and Co KG
Original Assignee
Hermes Schleifmittel GmbH and Co KG
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 Hermes Schleifmittel GmbH and Co KG filed Critical Hermes Schleifmittel GmbH and Co KG
Priority to EP17172052.7A priority Critical patent/EP3403765B1/fr
Publication of EP3403765A1 publication Critical patent/EP3403765A1/fr
Application granted granted Critical
Publication of EP3403765B1 publication Critical patent/EP3403765B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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

Definitions

  • the invention relates to a composite underlay for abrasives comprising a paper backing and a fabric associated therewith.
  • the invention further relates to a coated abrasive and a sanding belt based on the composite substrate according to the invention.
  • Undercoated abrasives are grinding tools such as abrasive belts or grinding wheels. They have a base coated with binder and abrasive grain. Typical underlay consist of paper, fleece, woven fabric, knitted fabric, polymer film or combinations thereof. Documents are selected for specific use. Important requirements here are tear resistance, dimensional stability, tear resistance and surface quality. Furthermore, a pad is exposed to high loads during use, such as tensile, compressive and shear loads, especially in the absorption of grinding forces and the driving forces of the grinding machine. A typical failure pattern especially with abrasive belts with a paper backing is the tearing in the edge zone, usually orthogonal to the direction of travel. The crack continues across the width and leads to the failure of the sanding belt. In general, paper is a well-suited base, because it combines a high surface quality with sufficient dimensional stability and tensile strength. Accordingly, paper sanding belts become a wide one
  • the present invention is based on the object to provide a composite substrate of the type mentioned, which has a good tear strength and manages with a small amount of textile reinforcing material.
  • the invention solves this problem in a composite substrate of the type mentioned in that the basis weight of the textile fabric is 30% or less of the basis weight of the paper underlay; and that the breaking elongation of the fabric across the intended working direction of the composite substrate is at least 35%.
  • the composite substrate has a paper base and a fabric associated therewith.
  • Textile fabrics are for example knitted fabric, knitted fabrics, woven or nonwoven fabrics.
  • the connection between the paper underlay and the textile fabric is flat, preferably over the entire surface.
  • the intended working direction is that main direction of action in which an abrasive, grinding tool or abrasive belt based on the composite backing according to the invention is to be used.
  • the intended working direction is the advancing direction of this grinding belt during operation.
  • the breaking elongation of the textile fabric is determined on the fabric itself, not on the finished composite.
  • the pad according to the invention dispenses with such a strongly dimensioned fabric.
  • a light, textile fabric is flexibly / plastically deformable adhered to the paper, wherein the sheet has a high elongation at break, ie only breaks at a significant elongation. If the edge of such a laminated abrasive belt exposed to a high tearing load, so keep the threads of the textile fabric of the load, without tearing threads or bunches of threads. Rather, the forces introduced on the one hand cause an elongation or deformation of the textile fabric, for example, by stretching stitches or curved yarn courses are stretched.
  • the textile fabric is glued plastic or elastic, which is why this can be moved on the paper backing.
  • the bonding preferably takes place with comparatively low adhesion, so that threads can become detached from tearing before tearing. As a result, forces are absorbed by a variety of threads and weakened load peaks for individual threads.
  • the weight per unit area of the textile fabric is 10 to 30%, preferably 10 to 20%, of the basis weight of the paper underlay.
  • the tearing strength of the paper backing can thus be significantly improved with a relatively low use of textile material.
  • the weight per unit area of the textile fabric is 30 to 150 g / m 2 , preferably 50 to 100 g / m 2 .
  • the breaking elongation of the textile fabric transversely to the intended working direction of the composite backing is preferably 35 to 200%, more preferably 60 to 180%, more preferably 100 to 150%. Such elongation at break enables a higher force absorption and thus an improvement of the resistance of the paper backing against tearing.
  • the breaking load of the fabric is transverse to the intended working direction of the composite substrate 50 to 200 N / 50 mm, more preferably 100 to 200 N / 50 mm. This allows, in particular in combination with the described extensibility, an effective securing of the paper backing against tearing or tearing.
  • the paper underlay and the fabric associated therewith are glued. This allows a surface connection of paper underlay and textile fabric as well as an effective power dissipation from the paper underlay into this fabric.
  • Suitable adhesives ensure elastic / plastic incorporation of the textile fabric on the paper underlay. Under elastic / plastic involvement is understood that the corresponding structural elements are connected to each other by means of an adhesive, but under the action of z. B. tensile, compressive or shear forces allow a relative movement between the structural elements without the bond between them is destroyed. In contrast, the ductile or brittle fracture is to be seen, in which it breaks only with slight deformation.
  • the adhesive systems are preferably based on polymerizable plastics.
  • the plastics are subdivided into plastomers (thermoplastics), elastomers and duromers.
  • Duromers are highly crosslinked and have many inelastic compounds. This gives them a hard, firm or hard-elastic mechanical behavior. This is the same up to the decomposition temperature.
  • Plastomers may be amorphous or partially crystalline. Their behavior is temperature-dependent. The properties at room temperature (RT) over the application temperature range (RT up to approx. 90 ° C) as abrasive belt up to the production of abrasives (up to 130 °) are very different depending on the temperature. The properties can vary from soft-elastic over elastic be adjusted plastically to rigidly ( H. buyer, working with plastics, Springer Verlag, 1978, p.28ff .).
  • Elastomers are differentiated into thermoplastic or crosslinked elastomers.
  • the properties can be referred to as reversible plastic or rubber-elastic.
  • plastomers and elastomers or mixtures which have an adhesive strength at temperatures up to 130 ° C. are preferred over the mechanical stresses during production, and have an adhesive strength up to 90 ° C. in order to absorb the mechanical stress during the grinding operation.
  • This system should allow elastic and / or plastic deformation to obtain the desired higher elongation at break.
  • Suitable adhesives are, for example, polyurethanes (polyether and / or polyester polyurethanes), synthetic or natural rubbers (IR, SBR, NBR) and poly (meth) acrylates.
  • abrasive is applied on the composite substrate according to the invention. This is often done with duromer-based binders. This may affect desirable properties such as elongation at break.
  • a thermoplastic polyurethane system can be used.
  • the strength of the carrier composite during the manufacture of the abrasive and in the application of the abrasive not, for example, heat affected For example, a reactive binder system can be used which crosslinks the plastic system after application.
  • the adhesive preferably has an E-modulus (determined according to DIN EN ISO 527) of 5 to 500 N / mm 2 , more preferably 5 to 250 N / mm 2 , more preferably 5 to 100 N / mm 2 .
  • E-modulus determined according to DIN EN ISO 5257
  • Preferably used elastomers have an elongation at break of 5 to 100 N / mm 2 .
  • the adhesive has an elongation at break (determined according to DIN EN ISO 527) of 100 to 800%, preferably 300 to 600%.
  • the adhesive has a peel adhesion at 90 ° C and 90 ° peel angle of at least 30 N / 50 mm.
  • the surface coverage of the adhesive may according to the invention in the range 15 to 50 g / m 2 , preferably 20 to 35 g / m 2 lie.
  • the textile fabric used according to the invention preferably has threads of synthetic polymers.
  • the use of cotton or other cellulosic fibers is less preferred because there is a risk of embrittlement of cellulose by phenol-formaldehyde resins of the grain-binder layer in the course of the application of abrasive.
  • the textile fabric has no straight or only slightly curved yarn courses. Strongly curved thread courses or / and a high elongation at break of the fibers used, such as, for example, elastomer fibers, are preferred.
  • Woven fabrics, knitted fabrics, Raschel wares, etc. are also suitable.
  • Nonwovens are also generally suitable.
  • Prefers The alignment of textile structural elements is not parallel to the edge (working direction) of the composite substrate.
  • the textile fabric structure elements of threads which extend at an angle of 20-70 °, preferably 30-60 ° to the longitudinal edge of the composite substrate.
  • the textile fabric may therefore preferably have stitches or be a knitted fabric.
  • Another object of the invention is a coated abrasive, characterized in that it comprises a composite backing according to the invention.
  • the application of the abrasive takes place in a manner known in principle from the prior art.
  • a preferred embodiment of the invention is an abrasive belt, preferably a segmented abrasive belt, characterized in that it has a composite backing according to the invention.
  • the measurement is carried out according to the following procedure.
  • At least 5 sample strips separated from each other for warp and / or weft direction at least 100 mm from the fabric edge are to be taken straight from the test sample and to thread straight on raw goods and finished goods. If no plucking of the samples is possible, the sample should be cut to size as finished product.
  • a load cell 10 kN shall be used on the Instron 4302 tensile tester.
  • the individual sample with its free clamping length should be clamped in the middle area of the clamping jaws so that no distortion within the free clamping length in the sample is visible.
  • Each sample is subjected to breakage.
  • the samples are trimmed to the sample size of 145 x 57 mm with the impact shears.
  • the specimens are to be placed in corresponding block molds for adhesion tests (with tolerance according to DIN 7168 medium) with the surface to be tested facing upwards and secured therein.
  • a beech wood block with the width of 50 + 0.5 mm, the depth of 25 + 1 mm and the height of 10 + 1 mm is coated with a 2-component adhesive and stuck in the sample surface of the mold During drying, each sample is with a 2 + 0.1 kg metal weight too complain.
  • a test sample can also be retested on the unchecked non-bonded surface.
  • the time between bonding of the samples and the adhesion test is at least 12 h.
  • test temperature is 90 ° C (Instron temperature chamber model 3119-005 series 9500, residence time 5 min).
  • Instron Model 4465 tensile tester with a computer-aided Instron MT test program.
  • the test speed is 100 mm / min.
  • a force transducer of 1 kN is used.
  • the tensile force F in [N] is continuously measured, which is necessary to peel the test sample from the wooden block. From this, the average adhesion force is determined computer-aided. From the individual test values, the arithmetic mean is formed.
  • the paper backing used is an Abrasive Base Paper M85 A-HB (710350) (Kämmerer Spezialpapiere GmbH, Osnabschreib).
  • the characteristics of this paper underlay are as follows: According to: minute Typical values Max. 1.0 Grammage: DIN EN ISO 536 g / m 2 390 400 410 Base weight 2.0 Thickness: DIN EN ISO 534 microns 460 Thickness: 3.0 density: DIN EN ISO 534 g / m3 0.870 density: 4.0 Breaking strength: DIN EN ISO 1924-2 I / MD KN / m 46.0 48.0 Tensile strength: q / CD KN / m 18.0 22.0 5.0 Elongation at break: DIN EN ISO 1924-2 I / MD % 3.5 Stretch at rupture: q / CD % 8.5 6.0 Tear resistance Elmendorf: DIN EN ISO 1974 I / MD mN 4400 5500 Tearing strength: q / CD mN 5500 6600 7.0 WasseraufnahEn
  • the textile fabric used is a knitted fabric having a felt weave and a basis weight of 60 g / cm 2 .
  • Characteristic of a fillet binding are the variable length in their net-like openings. These arise due to the lack of cross-connections to the meshes directly adjacent in the respective row ( Fig. 1 ). The number of cross-links missing in sequence determines the length of the net-shaped opening. This is done by at least one cross-connection ( Fig. 2 ) bounded on both sides. In the FIGS. 2 and 3 forces represented by arrows produce the net-like Appearance of the raw knitwear.
  • This knitted fabric is laminated to the paper underlay using a reactive PU adhesive (SikaMelt-9603 IS) (surface application 25-30 g / m 2 via hotmelt system).
  • a reactive PU adhesive SikaMelt-9603 IS
  • Fig. 4 shows the finished composite substrate with the orientation of the fabric with respect to the edge course (lower edge of the picture). The force occurring when tearing does not hit at right angles, but slants on the mesh of the knitted fabric and thus favors an elastic / plastic deformation.
  • the measurement results show a high resistance of the composite backing according to the invention against tearing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP17172052.7A 2017-05-19 2017-05-19 Couche d'adhérence pour produit abrasif Active EP3403765B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17172052.7A EP3403765B1 (fr) 2017-05-19 2017-05-19 Couche d'adhérence pour produit abrasif

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17172052.7A EP3403765B1 (fr) 2017-05-19 2017-05-19 Couche d'adhérence pour produit abrasif

Publications (2)

Publication Number Publication Date
EP3403765A1 true EP3403765A1 (fr) 2018-11-21
EP3403765B1 EP3403765B1 (fr) 2022-04-13

Family

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Family Applications (1)

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Country Status (1)

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EP (1) EP3403765B1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1652903A1 (de) * 1967-04-12 1971-10-28 Holsteinische Textilveredlungs Unterlagsmaterial fuer Schleifmittel
DE2333980A1 (de) 1973-07-04 1975-01-23 Carborundum Werke Gmbh Bahnfoermiges verbundmaterial fuer die herstellung ueberbreiter schleifbaender
EP0239126A2 (fr) * 1986-03-28 1987-09-30 Norton Company Textile surpiqué, son utilisation pour la fabrication d'abrasifs en feuilles, et abrasifs en feuilles
DE102011122012A1 (de) * 2011-12-22 2013-06-27 Neenah Gessner Gmbh Imprägnierte Schleifrohpapiere und daraus hergestellte Schleifpapiere
DE202014102523U1 (de) * 2014-05-28 2014-06-23 Mattes & Ammann Gmbh & Co. Kg Schleifvorrichtung zum lösbaren Befestigen an einem Klettverschluss

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1652903A1 (de) * 1967-04-12 1971-10-28 Holsteinische Textilveredlungs Unterlagsmaterial fuer Schleifmittel
DE2333980A1 (de) 1973-07-04 1975-01-23 Carborundum Werke Gmbh Bahnfoermiges verbundmaterial fuer die herstellung ueberbreiter schleifbaender
EP0239126A2 (fr) * 1986-03-28 1987-09-30 Norton Company Textile surpiqué, son utilisation pour la fabrication d'abrasifs en feuilles, et abrasifs en feuilles
DE102011122012A1 (de) * 2011-12-22 2013-06-27 Neenah Gessner Gmbh Imprägnierte Schleifrohpapiere und daraus hergestellte Schleifpapiere
DE202014102523U1 (de) * 2014-05-28 2014-06-23 Mattes & Ammann Gmbh & Co. Kg Schleifvorrichtung zum lösbaren Befestigen an einem Klettverschluss

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
H. KÄUFER: "Arbeiten mit Kunststoffen", 1978, SPRINGER VERLAG, pages: 28

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