EP0699506A1 - Schleifband - Google Patents

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Publication number
EP0699506A1
EP0699506A1 EP95305697A EP95305697A EP0699506A1 EP 0699506 A1 EP0699506 A1 EP 0699506A1 EP 95305697 A EP95305697 A EP 95305697A EP 95305697 A EP95305697 A EP 95305697A EP 0699506 A1 EP0699506 A1 EP 0699506A1
Authority
EP
European Patent Office
Prior art keywords
belt
abrasive
adhesive layer
backing material
tube
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.)
Withdrawn
Application number
EP95305697A
Other languages
English (en)
French (fr)
Inventor
A Dargie
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.)
Black and Decker Inc
Original Assignee
Black and Decker Inc
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 Black and Decker Inc filed Critical Black and Decker Inc
Publication of EP0699506A1 publication Critical patent/EP0699506A1/de
Withdrawn legal-status Critical Current

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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

Definitions

  • This invention relates to abrasive belts, and in particular to belts for use with power files or the like.
  • Power files are well known which comprise two spaced rollers, one of which is driven by an electric motor, about which a continuous abrasive belt may run for sanding or polishing a workpiece, for example.
  • the power files are generally hand-held and the two rollers are positioned to tension the continuous belt to produce smooth running of the belt about the two rollers.
  • Continuous belts for power files of the aforementioned type have been known for many years and have changed little.
  • the belts have been manufactured using a backing material of either paper, cloth or a combination of both with abrasive grit bonded to the front face using a number of resin or glue coats.
  • the abrasive coated material is manufactured in jumbo rolls having a width of between 0.5 and 1.5 meters and lengths up to several hundred meters.
  • the jumbo rolls are converted into lengths equal to the "developed" or final length of the belt and then formed into an endless loop by joining the two ends together. Once joined, the endless loop formed from the jumbo roll is slit down to the required width.
  • Many methods exist for forming the joint the two most favoured methods of manufacture being the "butt joint" and the "lapp and skieve joint".
  • FIG. 1A A typical butt joint abrasive loop 1 is shown in Figure 1A of the accompanying drawings.
  • the section taken along the line I-I in Figure 1A is shown in Figure 1B.
  • the belt 1 comprises a backing material 3, which may be cloth including stabilising fillers, a make coat 5 (i.e. a primary adhesive coat), a size coat 7 (i.e. a secondary adhesive coat) and abrasive grain or particles 9.
  • the jointing media 11 which is usually a polyester based tape, is applied to the inside of the belt 1 overlapping the two ends of the belt 1 as shown in Figure 1B.
  • a continuous (or endless) abrasive belt is formed.
  • a measure of the discontinuity of a belt is provided by the arithmetic difference between the total thickness dimension D of the belt and the thickness d of the basic coated abrasive material, which in this instance results in a discontinuity (i.e. D - d) corresponding to the jointing tape 11 thickness.
  • the jointing tape 11 passes over the power file/sander running plate (not shown) and rollers (not shown) resulting in wear, which often becomes so severe that the jointing tape 11 can no longer carry the tension in the belt 1, thereby resulting in failure of the belt 1.
  • Figure 2 shows a typical continuous belt formed using a lap and skieve joint.
  • the composition of the basic coated abrasive material is the same as that described with reference to Figure 1 of the drawings. In this instance, however, the ends of the material are spliced at an angle, overlapped, and then bonded together using an adhesive.
  • the discontinuity of this joint (D - d) tends to be larger than that of the butt joint of Figure 1B and may vary from 0.2 mm to 0.3 mm, depending upon a manufacturer's preference and process capability.
  • the present invention aims to improve upon the known prior art continuous abrasive belts by providing an abrasive belt having a negligible discontinuity throughout the length of the belt.
  • the present invention therefore provides a continuous abrasive belt for a power file or the like, wherein the belt has a substantially constant thickness throughout. More particularly, the belt is preferably seamless.
  • the belt preferably comprises a backing material, an adhesive layer on the backing material and an abrasive layer on the adhesive layer.
  • the backing material is preferably a cloth impregnated with a resin.
  • Other suitable backing materials could, of course, alternatively be used.
  • a second adhesive layer is preferably applied to the abrasive layer to assist in retaining the abrasive layer on the backing material.
  • a method of forming a continuous abrasive belt comprising the steps of:
  • steps (b)-(d) could occur in any order after step (a).
  • a second adhesive layer is applied to the exterior of the tube overlaying the particle layer.
  • the backing material is preferably filled with resin and cured. More preferably, the backing material is of cloth.
  • the belt is baked in an oven between steps (c) and (d). Further, if a second adhesive layer is applied to the tube, the belt is also preferably baked in an oven after the application of the second adhesive layer.
  • the particle layer may be applied by an electrostatic coating process or using a gravity feed hopper. Other ways of applying the particle layer can, of course, alternatively be used.
  • the belt is flexed to crack the adhesive layer or layers prior to use of the belt. By doing this, loss of abrasive particles during use is less likely to occur.
  • a seamless, continuous, abrasive belt 31 comprises a backing material 33 of cotton cloth impregnated with resin, a make or primary adhesive coat 35, a layer of abrasive particles 37 and a size or secondary adhesive coat 39. Since there is no joint in the continuous belt, the thickness of the belt is substantially constant (within normal manufacturing tolerances) along its entire length. The discontinuity (D - d) of the belt is, therefore, negligible (i.e. essentially zero).
  • a tube of cotton cloth 33 of known tensile strength is manufactured by weaving using processes developed in the cloth and hosiery industries.
  • the tube 33 because of its nature of construction, is totally jointless and seamless.
  • the tube diameter is simply chosen to correspond to the diameter of the required abrasive belt, whereas the length of the tube exceeds considerably the width of the final belt 31.
  • the tube 33 is likely to be manufactured in lengths of several hundred meters; it will then be cut to a length which is practical to handle during manufacture, probably in the region of one meter. Once the abrasive coating stages of belt manufacture have been completed, however, the tube is cut or slit down to the required final belt width.
  • the hub 41 is to take one of three formats, namely either (i) a solid drum which has a diameter equal to that required of the finished belt 31, (ii) a drum which is variable in diameter to accommodate a range of belt sizes, or (iii) two smaller diameter rollers separated by a variable size pitch, thereby allowing a range of tube sizes to be accommodated.
  • the tube 33 is subjected to the normal first stage of filling the cloth material with resin 43, etc, in order to stabilise the cloth 33 and reduce/eliminate the tendency for the cloth 33 to stretch or distort.
  • the filled cloth 33 has a make or primary adhesive coat 35 applied thereto by allowing the tube of cloth 33 to run in a bath 44 of adhesive.
  • the adhesive is either a glue or resin, the thickness of the coat 35 being controlled with a scraper knife 45.
  • the abrasive grit 37 is added via a gravity feed hopper (not shown) or an electrostatic coating device 47.
  • the tube 33 now covered in make coat 35 and abrasive particles 37, is baked in an oven 49 at an elevated temperature to cure the make coat 35.
  • the final adhesive or size coat 39 is applied after the curing process in oven 49. Again, application of the size coat 39 is achieved by running the tube 33 in a bath 51 of adhesive and removing the excess adhesive with a scraper knife 53. The final curing stage is then completed in a second baking oven 55.
  • the tube 33 is cut diametrically to produce seamless, continuous abrasive belts having the required width. In this way, an abrasive belt 31 without a seam or joint is produced.
  • the make coat and size coat of an abrasive belt can result in a degree of rigidity being provided. Since this rigidity would adversely affect the performance of the abrasive belt due to the belt being incapable of deforming satisfactorily to meet even the slightest contour exhibited by a workpiece, it is normal for the abrasive bond to be "cracked” or broken in a controlled manner to improve flexibility of the belt. This process is called "flexing". If the flexing is not controlled correctly and is excessive, the adhesive bond will fail to hold the abrasive particles, thereby resulting in grit shed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP95305697A 1994-09-01 1995-08-15 Schleifband Withdrawn EP0699506A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9417543A GB9417543D0 (en) 1994-09-01 1994-09-01 An abrasive belt
GB9417543 1994-09-01

Publications (1)

Publication Number Publication Date
EP0699506A1 true EP0699506A1 (de) 1996-03-06

Family

ID=10760638

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95305697A Withdrawn EP0699506A1 (de) 1994-09-01 1995-08-15 Schleifband

Country Status (2)

Country Link
EP (1) EP0699506A1 (de)
GB (1) GB9417543D0 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6572505B1 (en) 1999-11-12 2003-06-03 The Gates Corporation Power transmission belt using stabilized open mesh textile material in overcord for enhanced rubber penetration
US6632151B1 (en) 1999-11-12 2003-10-14 The Gates Corporation Power transmission belt with tubular knit overcord
WO2005063445A1 (en) * 2003-12-29 2005-07-14 Impianti Macchine & Tecnologie S.R.L. Method and plant for manufacturing flexible abrasives, as well as flexible abrasive manufactured with said method
CN101693356B (zh) * 2009-07-24 2012-01-25 扬中市江南砂布有限公司 高效超强合金钢中磨砂带及其检测方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6179576A (ja) * 1984-09-28 1986-04-23 Kouyoushiya:Kk 研磨ベルト
JPH0355170A (ja) * 1989-07-23 1991-03-08 Atsushi Kitamura 研磨ベルトおよび研磨機
WO1993012911A1 (en) * 1991-12-20 1993-07-08 Minnesota Mining And Manufacturing Company A coated abrasive belt with an endless, seamless backing and method of preparation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6179576A (ja) * 1984-09-28 1986-04-23 Kouyoushiya:Kk 研磨ベルト
JPH0355170A (ja) * 1989-07-23 1991-03-08 Atsushi Kitamura 研磨ベルトおよび研磨機
WO1993012911A1 (en) * 1991-12-20 1993-07-08 Minnesota Mining And Manufacturing Company A coated abrasive belt with an endless, seamless backing and method of preparation

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 249 (M - 511) 27 August 1986 (1986-08-27) *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 203 (M - 1116) 24 May 1991 (1991-05-24) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6572505B1 (en) 1999-11-12 2003-06-03 The Gates Corporation Power transmission belt using stabilized open mesh textile material in overcord for enhanced rubber penetration
US6632151B1 (en) 1999-11-12 2003-10-14 The Gates Corporation Power transmission belt with tubular knit overcord
US6863761B2 (en) 1999-11-12 2005-03-08 The Gates Corporation Power transmission belt using stabilized open mesh textile material in overcord for enhanced rubber penetration
US6945892B2 (en) 1999-11-12 2005-09-20 The Gates Corporation Power transmission belt with tubular knit overcord
US7182826B2 (en) 1999-11-12 2007-02-27 The Gates Corporation Power transmission belt with tubular knit overcord
WO2005063445A1 (en) * 2003-12-29 2005-07-14 Impianti Macchine & Tecnologie S.R.L. Method and plant for manufacturing flexible abrasives, as well as flexible abrasive manufactured with said method
CN101693356B (zh) * 2009-07-24 2012-01-25 扬中市江南砂布有限公司 高效超强合金钢中磨砂带及其检测方法

Also Published As

Publication number Publication date
GB9417543D0 (en) 1994-10-19

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