US3762894A - Abrasive medium comprising short fibers in the synthetic resin binder - Google Patents

Abrasive medium comprising short fibers in the synthetic resin binder Download PDF

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Publication number
US3762894A
US3762894A US00115164A US3762894DA US3762894A US 3762894 A US3762894 A US 3762894A US 00115164 A US00115164 A US 00115164A US 3762894D A US3762894D A US 3762894DA US 3762894 A US3762894 A US 3762894A
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United States
Prior art keywords
synthetic resin
abrasive medium
medium according
short fibers
abrasive
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Expired - Lifetime
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US00115164A
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English (en)
Inventor
R Holzhauer
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RUEGGEBERG A FA
RUGGEBERG A FA DT
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RUEGGEBERG A FA
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    • 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

  • ABSTRACT 130 Foreign Application Priority Dam An abrasive medium including a layer ofubrusive parti y Gcrmany P 29 25 294-4 cles attached to :1 synthetic resin-impregnated fiberglass mat backing by a synthetic resin binder wherein [52] [1.5. CI. 51/298, 51/295 either or both of Said resins Contain Short ib f [51] Int.
  • the invention concerns an abrasive medium made up of abrasive particles attached to a base, such as abrasive paper, abrasive cloth, endless abrasive belts, socallcd fiber abrasives and the like. It is advantageous that these abrasives be as flexible as possible. At the same time, it is necessary for the abrasive grain layer on the backing to be attached so firmly to the latter that even when the flexibility of the backing is exhausted, premature detachment of thebarasive grains can be avoided as much as possible.
  • the backing for such abrasive media has consisted of paper, cotton, synthetic silk or nylon cloth, or vulcanized fiber.
  • a disadvantage of previous abrasive media is that the backing materials known heretofore have only a limited temperature resistance.
  • the selection of resins with which the abrasive grains are attached to the base, with consideration of the backing, is limited to those types which can be set satisfactorily at maximum temperatures of approximately 120 130 C.
  • An object of the present invention is to overcome th hereinbefore mentioned shortcomings of previously used base materials.
  • abrasive particles are to be affixed to a base which possesses an especially high degree of flexibility and yet, despite this high flexibility, ensures a firm anchoring of the abrasive particles in the base.
  • the backing materials to be used should be indifferent to climatic conditions and withstand high temperatures even at high operating speeds.
  • the synthetic resins used to bind the abrasive grains should set at temperatures of about 180 C. and above. In this regard, synthetic resins may be selected which ensure an improved flexibility even after setting.
  • the present invention first consists in the fact that a fiberglass mat serves as the fibrous backing material, and that the impregnating synthetic resin for the fiberglass mat may contain short fibers of glass, other, ceramic material, asbestos, graphite or similar materials.
  • the synthetic resin acting as the binder for the abrasive grains may also contain these short fibers.
  • the short fibers may be included in either the synthetic resin impregnating the fiberglass mat or in the synthetic resin binding the abrasive grains to the mat or in both resins.
  • these short fibers are short fibers of fiberglass, with a length of several tenths of a millimeter to severalmillimeters.
  • the latter In using these short glass fibers, it is advantageous for the latter to have a length of a few tenths of a millimeter and a diameter of 0.003-0.012 mm.
  • the short glass fibers can preferably be added in amounts between 2 and 20 percent by weight, basedon the solid resin material.
  • the fiberglassmat-resin base is very flexible.
  • This fiberglass-resin combination is also insensitive to climatic conditions, since the glass fibers do not change their mechanical characteristics under the influence of moisture, as is the case with the vegetable fibers used in conventional bases such as paper, cotton cloth and vulcanized fiber. This fact also results in the abrasive medium according to the present invention being also especially well suited for wet grinding.
  • the adhesive strength of the abrasive grain binder layer will be increased to an unexpectedly high degree.
  • the short fibers preferably the short glass fibers, in the present case have the effect of micro-reinforcement or bridge formation, which has the effect that the ad hesion of the abrasive grains to the fiberglass mat base is significantly improved.
  • the adhesion of the synthetic resin binding the abrasive grains to the backing is subjected to especially high stress. This, in connection with the fact that the bond of the synthetic resin to the non-absorbent fiberglass surface is also difficult, shows the significance of optimum adhesion of the abrasive grains to the fiberglass mat base, obtainable according to the invention even under very severe thermal and flexion stress of the abrasive medium.
  • the abrasive medium prepared according to the present invention has not only an extraordinary abrasive resistance, abrasive quality, blast resistance and thermal capacity, but also an extremely high durability and resistance to alternating flexion, even with the most severe deformation.
  • prolonged stress on a conventional abrasive backing using vulcanized fiber with a diameter of 178 mm. and corundum grain size 24, with a lateral deflection of about l0 mm. developed a crack due to fatigue of the backing after l50,000 load cycles.
  • the fiberglass mat according to the invention including the short fiber reinforcement in the binder, was used under the same conditions, the abrasive on the base was still intact after 1.5 million load cycles.
  • the fiberglass mat that is used consists of fiber elements that are stretched out straight as fiber sections and ori ented in all directions. This gives the fiberglass mat, despite its high flexibility, the same strength in all stress directions.
  • the drawing shows a form of construction of the abrasive medium according to the invention, and is arranged as follows:
  • FIG. 1 is a top view of an abrasive medium whose base is punched out in disk form from a fiberglass mat,
  • FIG. 2 is a cross sectional view of a transverse cut through a portion of an abrasive medium as in FIG. 1, considerably magnified.
  • the base 3 of the abrasive medium consists of a disk of fiberglass material with a glass fiber weight of approximately 200 to 1,000 grams/m
  • the individual fiber elements consist of fiber segments 50 to 100 mm. long. These fiber segments can be in the-form of clustered fiber segments 1 or individual fiber segments 2. These fiber segments, about 50 100 mm. long, are stretched out straight and are oriented in all directions. The fibers are not bent and not snaked around each other, as is the case in fiberglass cloth.
  • a fiberglass mat disk of this kind is extremely porous and flexible.
  • the disk base is impregnated thoroughly with a synthetic impregnating resin.
  • the porous texture of this base is dense enough to prevent the abrasive grains 4 placed on the surface from falling through.
  • abrasive grains 4 which are preferably treated beforehand with an adhesion agent as discussed earlier, are soaked with a resin coating before being placed on the base; this is intended to ensure a positive anchoring on the base and an inner bond with the impregnating resin in the fiberglass mat.
  • Short glass fibers are incorporated in the impregnating resin layer 7 for the fiberglass mat base, and/or in the synthetic resin with which the abrasive grains 4 are surrounded.
  • the diameter of these short glass fibers which are already known for their use in strengthening fiberglass plastics, is about 0.003-0.0l2 mm.
  • the individual fiber elements have a length of 0.1 to approx. 3 mm.
  • the amount of short glass fibers added may be 2 to percent by wt., based on the solid resin content.
  • the short glass fibers are labelled 6 in FIG. 2.
  • the binders used may be based on epoxy, polyester, melamine or preferably on phenol resin, and specially elasticized.
  • abrasive media can be used on an unlimited basis in wet grinding processes, which are known to give an especially good finish.
  • short glass fibers may also be combined with powdered fillers such as marble dust (CaCO cryolite Na (AlF pyrite (FeS iron oxide (FeO, Fe O and the like.
  • powdered fillers such as marble dust (CaCO cryolite Na (AlF pyrite (FeS iron oxide (FeO, Fe O and the like.
  • the mechanical and thermal properties of the abrasive medium can be influenced within broad limits by these fillers. It is to be understood that the term ceramic material as used in the present specification and claims is intended to be generic to glass.
  • an abrasive medium comprising a layer of abrasive particles bonded by means of a thermosetting synthetic resin binder to a backing comprising a mat of glass fibers impregnated with a thermosetting synthetic resin
  • the improvement comprising uniformly incorportating into said synthetic resin binder extremely short fibers having a length of from about 0.1 to about 3mms. and a diameter of from about 0.003 to 0.012 mm., and being of a material selected from the group consisting of asbestos, ceramic material and graphite.
  • said synthetic resin binder comprises a synthetic resin which sets at a temperature of at least C.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Reinforced Plastic Materials (AREA)
  • Laminated Bodies (AREA)
US00115164A 1970-05-23 1971-02-16 Abrasive medium comprising short fibers in the synthetic resin binder Expired - Lifetime US3762894A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2025204A DE2025204C3 (de) 1970-05-23 1970-05-23 Flexibles Schleifwerkzeug

Publications (1)

Publication Number Publication Date
US3762894A true US3762894A (en) 1973-10-02

Family

ID=5771874

Family Applications (1)

Application Number Title Priority Date Filing Date
US00115164A Expired - Lifetime US3762894A (en) 1970-05-23 1971-02-16 Abrasive medium comprising short fibers in the synthetic resin binder

Country Status (8)

Country Link
US (1) US3762894A (nl)
AT (1) AT307912B (nl)
CH (1) CH541392A (nl)
DE (1) DE2025204C3 (nl)
ES (1) ES195054Y (nl)
FR (1) FR2092296A5 (nl)
GB (1) GB1263889A (nl)
NL (1) NL152189B (nl)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008034056A1 (en) * 2006-09-15 2008-03-20 Saint-Gobain Abrasives, Inc. Abrasive tool reinforced with short fibers
US20090205259A1 (en) * 2008-02-20 2009-08-20 Paul Burzynski Resin filled composite backing for coated abrasive products and a method of making the same
USD873517S1 (en) * 2017-07-21 2020-01-21 3M Innovative Properties Company Floor scrubbing pad

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117415736A (zh) * 2022-07-19 2024-01-19 株式会社东京钻石工具制作所 合成磨石、合成磨石组件、以及合成磨石的制造方法

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008034056A1 (en) * 2006-09-15 2008-03-20 Saint-Gobain Abrasives, Inc. Abrasive tool reinforced with short fibers
US20080072500A1 (en) * 2006-09-15 2008-03-27 Klett Michael W Microfiber reinforcement for abrasive tools
TWI392561B (zh) * 2006-09-15 2013-04-11 Saint Gobain Abrasives Inc 用於研磨工具之微纖維強化物
US8808412B2 (en) 2006-09-15 2014-08-19 Saint-Gobain Abrasives, Inc. Microfiber reinforcement for abrasive tools
US9586307B2 (en) 2006-09-15 2017-03-07 Saint-Gobain Abrasives, Inc. Microfiber reinforcement for abrasive tools
US20090205259A1 (en) * 2008-02-20 2009-08-20 Paul Burzynski Resin filled composite backing for coated abrasive products and a method of making the same
USD873517S1 (en) * 2017-07-21 2020-01-21 3M Innovative Properties Company Floor scrubbing pad

Also Published As

Publication number Publication date
GB1263889A (en) 1972-02-16
CH541392A (de) 1973-09-15
DE2025204C3 (de) 1973-01-04
DE2025204A1 (de) 1971-12-09
ES195054U (es) 1975-01-16
AT307912B (de) 1973-06-12
NL7100262A (nl) 1971-11-25
FR2092296A5 (nl) 1971-01-21
ES195054Y (es) 1975-06-01
NL152189B (nl) 1977-02-15

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