Wrapped taped belt
Methods of manufacturing a belt include, at least, laying up a plurality of cords of a belt build on a mandrel, laying up a tape adhesive on an inner surface of the plurality of cords, laying up a cushion layer on an opposing side of the tape adhesive, and vulcanizing the belt build in a profile-forming mold, where the tape adhesive is a vulcanizable rubber which is devoid carbon black. The methods may further include laying up an outer tape adhesive before the laying up of the plurality of cords, and in some aspects, tension layer is laid up before laying up the outer tape adhesive. In some other methods, the tension layer is laid up before the laying up of the plurality of cords. The methods may further include partially or fully wrapping the belt with a belt wrap prior to vulcanizing the belt.
1. A method of manufacturing a wrapped belt comprising:
laying up an un-vulcanized tension layer on a mandrel, the un-vulcanized tension layer being formed from a vulcanizable EPDM or HNBR rubber mixture;
laying up a first un-vulcanized tape overlying the un-vulcanized tension layer, the first un-vulcanized tape being formed from a vulcanizable EPDM or HNBR rubber mixture and having an adhesive surface that is not formed by solvated tackifying resin applied by spraying or dipping, the first un-vulcanized tape being laid up so that the adhesive surface faces away from the un-vulcanized tension layer;
laying up a plurality of cords on the adhesive surface of the first un-vulcanized tape adhesive;
laying up a second un-vulcanized tape on an opposite side of the plurality of cords relative to the first un-vulcanized tape adhesive, the second un-vulcanized tape being formed from a vulcanizable EPDM or HNBR rubber mixture and having an adhesive surface that is not formed by solvated tackifying resin applied by spraying or dipping, the second un-vulcanized tape being laid up so that the adhesive surface faces toward the plurality of cords;
laying up an un-vulcanized cushion layer overlying the second un-vulcanized tape on a side of the second un-vulcanized tape opposite the plurality of cords to thereby form a partially-complete un-vulcanized belt build, the un-vulcanized cushion layer being formed from a vulcanizable EPDM or HNBR rubber mixture;
wherein (i) when any one of the tension layer, first tape, second tape, or cushion layer is formed from its respective vulcanizable EPDM rubber mixture, then all of the tension layer, first tape, second tape, and cushion layer is formed from their respective vulcanizable EPDM rubber mixture; or (ii) when any one of the tension layer, first tape, second tape, or cushion layer is formed from its respective vulcanizable HNBR rubber mixture, then all of the tension layer, first tape, second tape, and cushion layer is formed from their respective vulcanizable HNBR rubber mixture;
wherein the un-vulcanized cushion layer forms a first side of the partially-complete un-vulcanized belt build and the un-vulcanized tension layer forms an opposite second side of the partially-complete un-vulcanized belt build, and in which the first and second sides are connected by opposite first and second edges of the partially-complete un-vulcanized belt build;
wrapping the partially-complete un-vulcanized belt build with a belt wrap so that the belt wrap completely covers the opposite first and second edges to thereby form a complete un-vulcanized belt build; and
vulcanizing the complete un-vulcanized belt build with temperature and pressure in a profile-forming mold such that the first un-vulcanized adhesive tape and the second un-vulcanized adhesive tape are at least partially intermixed within a contiguous vulcanized layer formed between the plurality of cords, and such that the tension layer and the cushion layer also are vulcanized, thereby forming a completed belt in which the first and second edges remain completely covered by the belt wrap.
2. The method of claim 1 further comprising fully wrapping the belt with the belt wrap prior to the vulcanizing the belt build.
3. The method of claim 1 , wherein the belt is a toothed belt.
4. The method of claim 1 , wherein the belt is a ribbed belt.
5. The method of claim 1 , wherein the belt is a non-toothed and non-ribbed belt.
6. The method of claim 1 , wherein the vulcanizing of the belt build includes:
heating to a temperature in range from 120° C. to 260° C., and
applying pressure in a range from 85 psig to 500 psig.
7. The method of claim 1 , wherein the first un-vulcanized tape and the second un-vulcanized tape are devoid of carbon black.
8. The method of claim 1 ,
wherein the adhesive surface of the first un-vulcanized tape is on one side of the first tape, the first tape having another adhesive surface on a side opposite the one side, and
the adhesive surface of the second un-vulcanized tape is on one side of the second tape, the second tape having another adhesive surface on a side opposite the one side.