CA1208155A - Non-adhesive steel cord conveyor belt - Google Patents
Non-adhesive steel cord conveyor beltInfo
- Publication number
- CA1208155A CA1208155A CA000438284A CA438284A CA1208155A CA 1208155 A CA1208155 A CA 1208155A CA 000438284 A CA000438284 A CA 000438284A CA 438284 A CA438284 A CA 438284A CA 1208155 A CA1208155 A CA 1208155A
- Authority
- CA
- Canada
- Prior art keywords
- rubber
- layer
- conveyor belt
- steel cord
- cord conveyor
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/04—Bulk
Abstract
ABSTRACT OF THE DISCLOSURE
A steel cord conveyor belt having a surface layer comprising silicone rubber, an inner core layer comprising steel cords and rubber bonded to the steel cords, and an intermediate layer comprising a material which is bondable to peroxide-vulcanized rubber and with sulfur-vulcanized rubber and interposed between and bonded by vulcanization to the surface layer and the inner layer.
A steel cord conveyor belt having a surface layer comprising silicone rubber, an inner core layer comprising steel cords and rubber bonded to the steel cords, and an intermediate layer comprising a material which is bondable to peroxide-vulcanized rubber and with sulfur-vulcanized rubber and interposed between and bonded by vulcanization to the surface layer and the inner layer.
Description
This invention rela es to conveyor belts for tacky substances, e.g. oil sand.
Such types of conveyor belts are required to pos-sess suEficient strength and Elexibility under annual climatic conditions for executing a long distance conveyance from an oil sand excavation point to a bitumen separation treat-ment plant, and because of this reason, steel cord conveyor belts are normally used. How~ver, as conveyor belts using general purpose rubbers which bond well with steel cords do not possess non-adhesivenPss, oil sand will stick to the belt su~Eaces and accumulate as thickly as one half inch (12.7 mm) and over during operation. This adheriny substance will generate unbalanced loading and overloading of the belt and accelerate wear on pulleys and the like.
Heretofore, in conveyor belts for oil sand, the non-adhesiYeness of the belts to oil sand has been main-tained by sprinkling kerosene, gas oil, etc. over the belt surfaces. However, since the sprinkling of oil is now forced to be terminated for reasons of fire protection and safety~
other methods are now required to be adopted to prevent the adhesion of oil sand. It may be one solution to give the conveyor belt itself a non-adhesive property, but con-veyor belts having the property of being non-adhesive to oil sand are not hitherto known.
It is generally known that silicone and Teflon, which have low solubility parameters (SP) and low critical surface tensions (~c3, are effective in rendering a surface non-adhesive. However, as silicone rubber does not bond to steel cords and is expensive, it has a problem of mech-anical strength and it is not economically feasible to di-rectly form silicone rubber into steel cord conveyor belts, and accordingly, no steel cord conveyor belts using sili-cone rubber are hitherto known.
Accordingly, it is an object of the present inven-tion to economically provide a conveyor belt which is non-adhesive in itself to sticky substances including oil sand, and ~hich does not require the use of sprinkled oil.
~r~5~i Vulcanization bonding of silicone rubber to gen-eral purpose rubbers, inc~uding natural rubber (NR), poly-styrene-butadiene copolymer rubber (SBR), polybutadiene rubber (BR), polyacrylonitrile-butadiene copolymer rubber (NBR), and polyethylene-propylene copolymer rubber (EPM
rubber), or to their blends is not ~nown yet. With regard to this point, the present invention also has as an object the provision of a conveyor belt which enables an inte-grated combination oE a general purpose rubber steel cord belt inner core layer and a silicone rubber surEace layer through vulcanization bonding.
According to the present invention, there is pro-vided a steel cord conveyor belt having a surface layer comprising silicone rubber, an inner core layer comprising steel cords and rubber bonded to the steel cords, and an intermediate layer comprising a material which is bondable to peroxide-vulcanized rubber and with sulfur-vulcanized rubber and interposed between and bonded by vulcaniza-tion to the surface layer and the inner layer.
Preferably, the sur~ace layer has a rubber content of at least 30~ by weight. In one embodiment, the rubber of the inner core layer comprises at least one rubber selected from natural rubber ~NR), polystyrene-budadiene copolymer rubber (ssR)~ polybutadiene rubber (sR) and a-blend of at least two thereof and has a total polymer content of at least 80~ by weight, and a rubber content oE at least 30%
by weight o ths total.
The intermediate layer materials is preferably duc~, especially one treated with resorcinol formalin latex (RFL treatment). Thus, the intermediate layer preferably comprises duck which has been subjected to resorcinol Eorma-lin latex treatment (RFL treatment) employing latex which comprises at least 80% by weight vinylpridine latex (VP). A
variety of rubber elastomers are also useful as intermediate layer materials, especialLy polyethylene-propylene-diene ternary copolymer rubber (EPDM rubber) which can be vul-canized with both peroxide and sulEur. Such intermediate layer materials can be used together wi-th polyethylene-propylene copolymer rubber ~E~?M rubber), modified silicone and ethylene-propylene copolymer rubber SSEP rubber) to obtain better results.
More particularly, the invention includes embodi-ments in which the intermediate layer comprises a poly-ethylene-propylene~diene ternar~ copolymer rubber (EPDM
rubber) layer on the inner layer.
Preferably, the intermediate layer includes at least one rubber selected from the group consisting of poly-ethylene-propylene copolymer rubber (PEM rubber~ and modi-fied silicone and ethylene-propylene copolymer blended rubber l~EP rubber) between the polyethylene~propylene-diene ternary copolymer rubber ~EPDM rubber) layer and the surface layer.
The intermediate layer may include EPM rubber or EPM rubber and SEP rubber interposed between the duck and the surface layerO
In the following, preferred embodiments of the present invention will be d~scribed in detail and in con-crete terms, together with numerical values.
Silicone rubber is vulcanized with peroxide, and a rubber for steel cord bonding is vulcanized with sulfur.
These rubbers do not bond with each other. They do not bond with each other even if a blend of both rubbers in equal amounts is used as an intermediate substance. The bonding strength between silicone rubber and this inter-mediate layer is l to 3 kg, and the bonding strength betweenthis intermediate layer and the steel cord bonding rubber is merely 3 to 5 kg. This is due to inhibition of vul-canization of silicone rubber when sulfur is present in peroxide-vulcanized rubber. The present invention at least partly mitigates this incompatibility between said rubbers.
The conditions of preferred embodiments of the present inven-tion were as follows:
~aterials Tested _ (a) Duck Ducks used in the present invention include single and mixed fabrics of nylon~ po]yester, vinylon, cotton, :~2~n8~ ss etc. Ducks have 800 to 20000 deniers lengthwise, and 800 to 20000 deniers crosswise, and the counts are 10 to 100 per 5 cm lengthwise, and 10 to 100 per 5 cm crosswise. When duck is to be treated, the resor-cinol formalin latex -treatment (RFL treatment) is ap-propria-te, and it is advisable to use latex having a vinylpyridine (VP) latex conten-t of 80% or over of the total latex.
The test material (A) was of nylon in both the warp and the weft, and the warp was a single twist yarn of 1260 deniers and the weft was 10 yarns of 1260 deniers twisted together. The counts were 80 per 5 cm lengthwise, and 15 per 5 cm crosswise.
The composition of the RFL was 1.3~ resorcinol, 1.9% 37%-formaline, 0.05~ NaOH, 28% 40%-vinylpyridine latex, and 68~75% water, and the treatment was effected by baking at 150C for 5 minutes.
(b) Silicone rubber It is appropriate to use silicone rubber having a rubber content of at least 30~. The test material (B) consisted of 100 parts of SH861U of Toray Silicone Industries, and 3 parts of dicumylperoxide (40~) of Nippon Oils & Fats Co., Ltd.
(c) Rubber Eor steel cord bonding The following composition was used as the -test material (C)~
Natural rubber (NR) 60 Polystyrene-bu-tadiene copolymer rubber (SBR) 40 ZnO (zinc oxide) 10 Stearic acid (S.A.) Resorcinol 4 Hexame-thylenete-tramine 2.3 Vulcanization accelerator CZ
(N-cyclohexyl2-benzothiazylsul~onamide) 1.2 Carbon black 35 Silica 30 12~8~S~
Softener 10 Colophony 5 Litharge 2 Sulfur 2 5 (d) Polyethylene-propylene-di.ene ternary copolymer rubber (EPDM rubber) The following composition was used as the test material ID);
EP93 (Japan Syn~heti.c Rubber Co., Ltd.) 100 Carbon HAF 50 Oil Inaphthene base~ 20 ZnO (zinc oxide) 5 Stearic acid (S.A.) Vulcanization accelerator TMTM
(tetramethylthiuram monosulfide) 1.5 Vulcanization accelerator MBT
(2-mercaptobenzothiazole) 0.5 Sulfur 1.5 (e) Polyethylene-propylene copolymer rubber (EPM rubber) The following compo,ition was used as the test 20 material (E):
FPll (Japan Synthet:ic Rubber Co., Ltd.) 100 Carbon HAF 50 Oil (paraffin base) 10 Dicumylperoxide (40~) 3 Ethylenedimethacrylate (EP~A) 3.3 (f) Blended rubber of modifi,~d silicone and ethylene-propylene copolymer (SEP rubber) The following compo,ition was used as the test material ~F):
SFP171U (The Shin-Etsu Chemical Co., Ltd.)].00 Dicumylperoxide 3 Age register MB (2-mercaptobenzimidazole) In order to bond silicone rubber and steel cord bonding rubber together, the above-mentioned test materials were combined ~s follows:
~z~
Control case lI) B-C ISilST) Present invention's embodiment (II) B-A-C ISi/duck/ST) Present invention's embodiment ¦III) B-F-E-A-C ISi/SEP]EP~
duck/S~) Present invention's embodiment lIV) B-F-E-D-C (Si/SEP~EPM/
EPD~/ST) Conditions of Execution (Test Co_ditions) Rubber sheets of 40 mm wide by 180 mm long by
Such types of conveyor belts are required to pos-sess suEficient strength and Elexibility under annual climatic conditions for executing a long distance conveyance from an oil sand excavation point to a bitumen separation treat-ment plant, and because of this reason, steel cord conveyor belts are normally used. How~ver, as conveyor belts using general purpose rubbers which bond well with steel cords do not possess non-adhesivenPss, oil sand will stick to the belt su~Eaces and accumulate as thickly as one half inch (12.7 mm) and over during operation. This adheriny substance will generate unbalanced loading and overloading of the belt and accelerate wear on pulleys and the like.
Heretofore, in conveyor belts for oil sand, the non-adhesiYeness of the belts to oil sand has been main-tained by sprinkling kerosene, gas oil, etc. over the belt surfaces. However, since the sprinkling of oil is now forced to be terminated for reasons of fire protection and safety~
other methods are now required to be adopted to prevent the adhesion of oil sand. It may be one solution to give the conveyor belt itself a non-adhesive property, but con-veyor belts having the property of being non-adhesive to oil sand are not hitherto known.
It is generally known that silicone and Teflon, which have low solubility parameters (SP) and low critical surface tensions (~c3, are effective in rendering a surface non-adhesive. However, as silicone rubber does not bond to steel cords and is expensive, it has a problem of mech-anical strength and it is not economically feasible to di-rectly form silicone rubber into steel cord conveyor belts, and accordingly, no steel cord conveyor belts using sili-cone rubber are hitherto known.
Accordingly, it is an object of the present inven-tion to economically provide a conveyor belt which is non-adhesive in itself to sticky substances including oil sand, and ~hich does not require the use of sprinkled oil.
~r~5~i Vulcanization bonding of silicone rubber to gen-eral purpose rubbers, inc~uding natural rubber (NR), poly-styrene-butadiene copolymer rubber (SBR), polybutadiene rubber (BR), polyacrylonitrile-butadiene copolymer rubber (NBR), and polyethylene-propylene copolymer rubber (EPM
rubber), or to their blends is not ~nown yet. With regard to this point, the present invention also has as an object the provision of a conveyor belt which enables an inte-grated combination oE a general purpose rubber steel cord belt inner core layer and a silicone rubber surEace layer through vulcanization bonding.
According to the present invention, there is pro-vided a steel cord conveyor belt having a surface layer comprising silicone rubber, an inner core layer comprising steel cords and rubber bonded to the steel cords, and an intermediate layer comprising a material which is bondable to peroxide-vulcanized rubber and with sulfur-vulcanized rubber and interposed between and bonded by vulcaniza-tion to the surface layer and the inner layer.
Preferably, the sur~ace layer has a rubber content of at least 30~ by weight. In one embodiment, the rubber of the inner core layer comprises at least one rubber selected from natural rubber ~NR), polystyrene-budadiene copolymer rubber (ssR)~ polybutadiene rubber (sR) and a-blend of at least two thereof and has a total polymer content of at least 80~ by weight, and a rubber content oE at least 30%
by weight o ths total.
The intermediate layer materials is preferably duc~, especially one treated with resorcinol formalin latex (RFL treatment). Thus, the intermediate layer preferably comprises duck which has been subjected to resorcinol Eorma-lin latex treatment (RFL treatment) employing latex which comprises at least 80% by weight vinylpridine latex (VP). A
variety of rubber elastomers are also useful as intermediate layer materials, especialLy polyethylene-propylene-diene ternary copolymer rubber (EPDM rubber) which can be vul-canized with both peroxide and sulEur. Such intermediate layer materials can be used together wi-th polyethylene-propylene copolymer rubber ~E~?M rubber), modified silicone and ethylene-propylene copolymer rubber SSEP rubber) to obtain better results.
More particularly, the invention includes embodi-ments in which the intermediate layer comprises a poly-ethylene-propylene~diene ternar~ copolymer rubber (EPDM
rubber) layer on the inner layer.
Preferably, the intermediate layer includes at least one rubber selected from the group consisting of poly-ethylene-propylene copolymer rubber (PEM rubber~ and modi-fied silicone and ethylene-propylene copolymer blended rubber l~EP rubber) between the polyethylene~propylene-diene ternary copolymer rubber ~EPDM rubber) layer and the surface layer.
The intermediate layer may include EPM rubber or EPM rubber and SEP rubber interposed between the duck and the surface layerO
In the following, preferred embodiments of the present invention will be d~scribed in detail and in con-crete terms, together with numerical values.
Silicone rubber is vulcanized with peroxide, and a rubber for steel cord bonding is vulcanized with sulfur.
These rubbers do not bond with each other. They do not bond with each other even if a blend of both rubbers in equal amounts is used as an intermediate substance. The bonding strength between silicone rubber and this inter-mediate layer is l to 3 kg, and the bonding strength betweenthis intermediate layer and the steel cord bonding rubber is merely 3 to 5 kg. This is due to inhibition of vul-canization of silicone rubber when sulfur is present in peroxide-vulcanized rubber. The present invention at least partly mitigates this incompatibility between said rubbers.
The conditions of preferred embodiments of the present inven-tion were as follows:
~aterials Tested _ (a) Duck Ducks used in the present invention include single and mixed fabrics of nylon~ po]yester, vinylon, cotton, :~2~n8~ ss etc. Ducks have 800 to 20000 deniers lengthwise, and 800 to 20000 deniers crosswise, and the counts are 10 to 100 per 5 cm lengthwise, and 10 to 100 per 5 cm crosswise. When duck is to be treated, the resor-cinol formalin latex -treatment (RFL treatment) is ap-propria-te, and it is advisable to use latex having a vinylpyridine (VP) latex conten-t of 80% or over of the total latex.
The test material (A) was of nylon in both the warp and the weft, and the warp was a single twist yarn of 1260 deniers and the weft was 10 yarns of 1260 deniers twisted together. The counts were 80 per 5 cm lengthwise, and 15 per 5 cm crosswise.
The composition of the RFL was 1.3~ resorcinol, 1.9% 37%-formaline, 0.05~ NaOH, 28% 40%-vinylpyridine latex, and 68~75% water, and the treatment was effected by baking at 150C for 5 minutes.
(b) Silicone rubber It is appropriate to use silicone rubber having a rubber content of at least 30~. The test material (B) consisted of 100 parts of SH861U of Toray Silicone Industries, and 3 parts of dicumylperoxide (40~) of Nippon Oils & Fats Co., Ltd.
(c) Rubber Eor steel cord bonding The following composition was used as the -test material (C)~
Natural rubber (NR) 60 Polystyrene-bu-tadiene copolymer rubber (SBR) 40 ZnO (zinc oxide) 10 Stearic acid (S.A.) Resorcinol 4 Hexame-thylenete-tramine 2.3 Vulcanization accelerator CZ
(N-cyclohexyl2-benzothiazylsul~onamide) 1.2 Carbon black 35 Silica 30 12~8~S~
Softener 10 Colophony 5 Litharge 2 Sulfur 2 5 (d) Polyethylene-propylene-di.ene ternary copolymer rubber (EPDM rubber) The following composition was used as the test material ID);
EP93 (Japan Syn~heti.c Rubber Co., Ltd.) 100 Carbon HAF 50 Oil Inaphthene base~ 20 ZnO (zinc oxide) 5 Stearic acid (S.A.) Vulcanization accelerator TMTM
(tetramethylthiuram monosulfide) 1.5 Vulcanization accelerator MBT
(2-mercaptobenzothiazole) 0.5 Sulfur 1.5 (e) Polyethylene-propylene copolymer rubber (EPM rubber) The following compo,ition was used as the test 20 material (E):
FPll (Japan Synthet:ic Rubber Co., Ltd.) 100 Carbon HAF 50 Oil (paraffin base) 10 Dicumylperoxide (40~) 3 Ethylenedimethacrylate (EP~A) 3.3 (f) Blended rubber of modifi,~d silicone and ethylene-propylene copolymer (SEP rubber) The following compo,ition was used as the test material ~F):
SFP171U (The Shin-Etsu Chemical Co., Ltd.)].00 Dicumylperoxide 3 Age register MB (2-mercaptobenzimidazole) In order to bond silicone rubber and steel cord bonding rubber together, the above-mentioned test materials were combined ~s follows:
~z~
Control case lI) B-C ISilST) Present invention's embodiment (II) B-A-C ISi/duck/ST) Present invention's embodiment ¦III) B-F-E-A-C ISi/SEP]EP~
duck/S~) Present invention's embodiment lIV) B-F-E-D-C (Si/SEP~EPM/
EPD~/ST) Conditions of Execution (Test Co_ditions) Rubber sheets of 40 mm wide by 180 mm long by
2 mm thick and duck pieces of 40 mm wide by 180 mm long were prepared, and they were combined to form the afore-mentioned complex structures. These complex structures were press-vulcanized at 155C for 30 minutes. The pres-sure for pressing was 50 kg/c:m2. The press-vulcanized structures were cut into pieces of 1 inch (25.4 mm) wide and used as the samples for bonding strength measurement.
The 1 inch wide samples of the test material com-binations prepared in the manner described above were separated at the separating velocity of 100 mm/min, and the results of the separating force measurement between respective consecutive layers were as follows:
Control case (I) 1 to 3 kg (between B and C).
~resent Invention's embodiment III) 12 to 15 kg (between B and A)/
15 to 20 kg (between A and C).
Present invention's embodiment (III) 12 to 16 kg (between B and F), 15 to 20 kg (between F and E), 25 to 30 kg (between E and A), 15 to 20 kg (between A and C~.
Present invention's embodiment (IV) 12 to 16 kg (between B and F), 15 to 20 kg (between F and E), 20 to 25 kg (between E and D), 15 to 20 kg (between D and C).
As sho~n by the control case (I), mere combination of silicone rubber ~Si~ and the rubber for steel cord bond-ing lST) not in accordance with the present invention re-suIted in a small bonding strength, and in fact, they did not bond together. In contrast with this control test, s~
the present invention's embodiment (II) wherein a duck piece alone was interposed as an int:ermediate layer, the present invention's embodiment ~ wherein a duck piece was pro-vided on the rubber for steel cord bonding (ST), and peroxide-vulcanized EPM rubber and SEP rubber were interposed be-tween said duck piece and silicone rubber (Si~, and the present invention's embodlment (IV) wherein EPDM rubber which can be vulcanized with peroxide and with sulfur was provided on the rubber for steel cord honding ~ST), and EPM rubber and SEP rubber were interposecl between EPDM rubber and silicone rubber lSi) all resu]ted in a large bonding strength, and as a result, the present invention can provide a rela-tively inexpensive conveyor belt which possesses a variety of strength properties required of a conveyor belt as well as non-adhesiveness to sticky materials including oil sand.
Furthermore, the present invention can be reduced to practice with a variety of modifications within the scope of the invention, and the combinations and orders of the materials used are not limi-tecl to the aforementioned three embodiments of the invention. In other words, when duck is used, in addition to the combination of Si/duc~/ST of the present invention's embodiment (II) wherein duck is used by itself as the intermeçliate layer, when duck is used together with EPM rubber, a combination of Si/EPM/duck/ST
is satisfactory, which differs from the present invention's embodiment (III), Si/SEP/EPM/duck/ST, in omitting SEP. When EPDM is used on the rubber of the surface layer, in addition to the combination of Si/SEP/E:PM/EPDM/ST of the present invention's embodiment (IV), c:ombinations of Si/EP~/EPDM/ST, Si/EPDM/ST, and Si/SEP/EPDM/ST are satisfactory. Naturally, modifications o~ configuration and/or composition of each material, and modi~ications of the treating conditions within the scope o~ known technology are included within the scope of the present invention. Inclusion of duck serves to pre-vent cracking due to i~pacts of the material to be conveyed(oil sand).
The 1 inch wide samples of the test material com-binations prepared in the manner described above were separated at the separating velocity of 100 mm/min, and the results of the separating force measurement between respective consecutive layers were as follows:
Control case (I) 1 to 3 kg (between B and C).
~resent Invention's embodiment III) 12 to 15 kg (between B and A)/
15 to 20 kg (between A and C).
Present invention's embodiment (III) 12 to 16 kg (between B and F), 15 to 20 kg (between F and E), 25 to 30 kg (between E and A), 15 to 20 kg (between A and C~.
Present invention's embodiment (IV) 12 to 16 kg (between B and F), 15 to 20 kg (between F and E), 20 to 25 kg (between E and D), 15 to 20 kg (between D and C).
As sho~n by the control case (I), mere combination of silicone rubber ~Si~ and the rubber for steel cord bond-ing lST) not in accordance with the present invention re-suIted in a small bonding strength, and in fact, they did not bond together. In contrast with this control test, s~
the present invention's embodiment (II) wherein a duck piece alone was interposed as an int:ermediate layer, the present invention's embodiment ~ wherein a duck piece was pro-vided on the rubber for steel cord bonding (ST), and peroxide-vulcanized EPM rubber and SEP rubber were interposed be-tween said duck piece and silicone rubber (Si~, and the present invention's embodlment (IV) wherein EPDM rubber which can be vulcanized with peroxide and with sulfur was provided on the rubber for steel cord honding ~ST), and EPM rubber and SEP rubber were interposecl between EPDM rubber and silicone rubber lSi) all resu]ted in a large bonding strength, and as a result, the present invention can provide a rela-tively inexpensive conveyor belt which possesses a variety of strength properties required of a conveyor belt as well as non-adhesiveness to sticky materials including oil sand.
Furthermore, the present invention can be reduced to practice with a variety of modifications within the scope of the invention, and the combinations and orders of the materials used are not limi-tecl to the aforementioned three embodiments of the invention. In other words, when duck is used, in addition to the combination of Si/duc~/ST of the present invention's embodiment (II) wherein duck is used by itself as the intermeçliate layer, when duck is used together with EPM rubber, a combination of Si/EPM/duck/ST
is satisfactory, which differs from the present invention's embodiment (III), Si/SEP/EPM/duck/ST, in omitting SEP. When EPDM is used on the rubber of the surface layer, in addition to the combination of Si/SEP/E:PM/EPDM/ST of the present invention's embodiment (IV), c:ombinations of Si/EP~/EPDM/ST, Si/EPDM/ST, and Si/SEP/EPDM/ST are satisfactory. Naturally, modifications o~ configuration and/or composition of each material, and modi~ications of the treating conditions within the scope o~ known technology are included within the scope of the present invention. Inclusion of duck serves to pre-vent cracking due to i~pacts of the material to be conveyed(oil sand).
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A steel cord conveyor belt having a surface layer comprising silicone rubber, an inner core layer com-prising steel cords and rubber bonded to said steel cords, and an intermediate layer comprising a material which is bondable to peroxide-vulcanized rubber and with sulfur-vulcanized rubber and interposed between and bonded by vulcanization to said surface layer and said inner layer.
2. A steel cord conveyor belt as claimed in claim 1, in which said surface layer has a rubber content of at least 30% by weight.
3. A steel cord conveyor belt as claimed in claim 1, in which said rubber of said inner core layer comprises at least one rubber selected from natural rubber (NR), poly-styrene-butadiene copolymer rubber (SBR), polybutadiene rubber (BR) and a blend of at least two thereof and has a total polymer content of at least 80% by weight, and a rubber content of at least 30% by weight of the total.
4. A steel cord conveyor belt as claimed in claim 1 or claim 2 or claim 3, in which duck is used as said inter-mediate layer.
5. A steel cord conveyor belt as claimed in claim 1, in which said intermediate layer comprises duck which has been subjected to resorcinol formalin latex treatment (RFL
treatment) employing latex which comprises at least 80% by weight vinylpridine latex (VP).
treatment) employing latex which comprises at least 80% by weight vinylpridine latex (VP).
6. A steel cord conveyor belt as claimed in claim 1, in which said intermediate layer comprises a polyethylene-propylene-diene ternary copolymer rubber (EPDM rubber) layer on said inner layer.
7. A steel cord conveyor belt as claimed in claim 2 or 3, in which said intermediate layer comprises a poly-ethylene-propylene-diene ternary copolymer rubber (EPDM
rubber) layer on said inner layer.
rubber) layer on said inner layer.
8. A steel cord conveyor belt as claimed in claim 6, in which said intermediate layer includes at least one rubber selected from the group consisting of polyethylene-propylene copolymer rubber (PEM rubber) and modified silicone and ethylene-propylene copolymer blended rubber (SEP rubber) between said polyethylene-propylene-diene ternary copolymer rubber (EPDM rubber) layer and said sur-face layer.
9. A steel cord conveyor belt as claimed in claim 5, in which said intermediate layer includes EPM rubber or EPM rubber and SEP rubber interposed between said duck and said surface layer.
10. A steel cord conveyor belt as claimed in claim 61 in which said intermediate layer includes duck and EPM rubber or EPM rubber and SEP rubber interposed between said duck and said surface layer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57187992A JPS5978004A (en) | 1982-10-25 | 1982-10-25 | Nonviscous steel cord conveyor belt |
| JP57-187992 | 1982-10-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1208155A true CA1208155A (en) | 1986-07-22 |
Family
ID=16215724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000438284A Expired CA1208155A (en) | 1982-10-25 | 1983-10-04 | Non-adhesive steel cord conveyor belt |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS5978004A (en) |
| CA (1) | CA1208155A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013109769A1 (en) | 2013-09-06 | 2015-03-12 | Contitech Transportbandsysteme Gmbh | Conveying system with improved temperature resistance |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4674622A (en) * | 1985-08-14 | 1987-06-23 | Bridgestone Corporation | Conveyor belt |
| JP2651670B2 (en) * | 1987-03-09 | 1997-09-10 | バンドー化学株式会社 | Heat resistant conveyor belt |
| JP2505246Y2 (en) * | 1989-10-27 | 1996-07-24 | 日本発条株式会社 | Card transport mechanism |
| AU738805B2 (en) * | 1997-06-16 | 2001-09-27 | Bridgestone Corporation | Conveyor belt and method of making the same |
| JP6291514B2 (en) * | 2015-03-25 | 2018-03-14 | 三ツ星ベルト株式会社 | Conveying belt and manufacturing method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5160088U (en) * | 1974-11-05 | 1976-05-12 | ||
| IT1165042B (en) * | 1979-04-24 | 1987-04-22 | Pirelli | CONVEYOR BELT |
-
1982
- 1982-10-25 JP JP57187992A patent/JPS5978004A/en active Granted
-
1983
- 1983-10-04 CA CA000438284A patent/CA1208155A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013109769A1 (en) | 2013-09-06 | 2015-03-12 | Contitech Transportbandsysteme Gmbh | Conveying system with improved temperature resistance |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0362604B2 (en) | 1991-09-26 |
| JPS5978004A (en) | 1984-05-04 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |