CH368093A - Conveyor belt - Google Patents
Conveyor beltInfo
- Publication number
- CH368093A CH368093A CH742560A CH742560A CH368093A CH 368093 A CH368093 A CH 368093A CH 742560 A CH742560 A CH 742560A CH 742560 A CH742560 A CH 742560A CH 368093 A CH368093 A CH 368093A
- Authority
- CH
- Switzerland
- Prior art keywords
- thickness
- fabric
- rubber
- strip
- conveyor belt
- Prior art date
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G3/00—Belt fastenings, e.g. for conveyor belts
- F16G3/10—Joining belts by sewing, sticking, vulcanising, or the like; Constructional adaptations of the belt ends for this purpose
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/14—Particular design of joint configurations particular design of the joint cross-sections the joint having the same thickness as the thickness of the parts to be joined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/433—Casing-in, i.e. enclosing an element between two sheets by an outlined seam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/45—Joining of substantially the whole surface of the articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/721—Fibre-reinforced materials
- B29C66/7212—Fibre-reinforced materials characterised by the composition of the fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/721—Fibre-reinforced materials
- B29C66/7214—Fibre-reinforced materials characterised by the length of the fibres
- B29C66/72141—Fibres of continuous length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D29/00—Producing belts or bands
- B29D29/06—Conveyor belts
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- 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
- B65G15/32—Belts or like endless load-carriers made of rubber or plastics
- B65G15/38—Belts or like endless load-carriers made of rubber or plastics with flame-resistant layers, e.g. of asbestos, glass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/4895—Solvent bonding, i.e. the surfaces of the parts to be joined being treated with solvents, swelling or softening agents, without adhesives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
- B29C66/7234—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer
- B29C66/72341—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer for gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2021/00—Use of unspecified rubbers as moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/709—Articles shaped in a closed loop, e.g. conveyor belts
- B29L2031/7092—Conveyor belts
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- 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
- B65G2201/06—Articles and bulk
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Laminated Bodies (AREA)
Description
Bande transporteuse
La présente invention concerne une bande transporteuse renforcée par du tissu de nylon, à structure ouverte.
On a déjà cherché à utiliser le nylon dans l'armature des bandes transporteuses en raison de ses qualités mécaniques, mais le nylon présente l'inconvénient de brûler trop facilement.
Par ailleurs, on a utilisé pour l'armature des bandes transporteuses, des tissus à mailles ouvertes, de façon à réaliser une continuité du caoutchouc d'une face à l'autre du tissu pour obtenir une meilleure cohésion des éléments de la bande et éviter des décollements, internes, ou d'un revtement.
La bande transporteuse selon la présente invention, qui permet d'éviter les inconvénients inhérents à la combustibilité du nylon, est caractérisée par le fait que l'armature est constituée de deux nappes de tissu, séparées par une épaisseur de masse caoutchouteuse au moins égale à l'épaisseur des deux nappes réunies, la masse caoutchouteuse étant incombustible et à l'état vulcanisé.
Comme masse caoutchouteuse ignifuge et pouvant tre vulcanisée on peut citer par exemple le caoutchouc au chloroprène (notamment le caoutchouc marque Néoprène ), ou encore un mélange de polychlorure de vinyle avec du caoutchouc au nitrile acrylique.
Le dessin annexé représente à titre d'exemple, une forme d'exécution de la bande selon l'invention.
La fig. 1 en est une vue schématique en perspective, coupée transversalement, et
les fig. 2, 3 et 4 en sont des coupes longitudinales partielles illustrant la formation d'une bande sans fin.
La bande de la fig. 1 est renforcée de deux nappes (1) et (2) de nylon, en tissu à larges mailles. Entre ces deux nappes, le centre de la bande est formé d'une couche (3) de masse caoutchouteuse incombustible et susceptible d'tre vulcanisée, par exemple un mélange de polychiorure de vinyle avec du caoutchouc au nitrile acrylique. Les faces sont garnies de revtements extérieurs 4 et 5. Sur les bords, s'étendent des bourrelets 6 et 7 en mélange caoutchouteux qui sont solidaires de toute l'épaisseur du caoutchouc.
La raideur transversale, ou corps de la bande dépend de la nature de la trame du tissu d'armature (diamètre des fils, densité, etc.,) et de l'épaisseur et du module d'élasticité des mélanges caoutchouteux.
La fig. 2 représente deux extrémités 20 et 21 d'une bande 19 que l'on veut réunir de façon à obtenir une bande sans fin.
La fig. 3 représente l'état de la bande 19 après décorticage et préparation: les revtements 25 et 26, sur l'extrémité 20, ainsi que la couche intermédiaire 22 sont éliminés de manière à laisser les tissus 23 et 24 à nu ou munis du mélange usuel d'enrobage favorisant l'adhérence mais sans surépaisseur.
Les deux plis 23 et 24 de l'extrémité 20 sont enduits d'un adhésif ou d'un solvant volatil sur leurs deux faces et appliqués l'un contre l'autre. Sur l'extrémité 21 seul le mélange intermédiaire 22 est enlevé. Les deux plis sont enduits sur leur seule face interne.
La fig. 4 montre l'assemblage final qui est vulcanisé suivant les techniques connues.
Les deux plis de l'extrémité 20 sont pris en sandwich entre les deux plis de l'extrémité 21 : la bande est fermée sur elle-mme sans surépaisseur et, si la longueur J est suffisante, sans diminution de résistance puisque d'une part, dans toutes les sections il y a au moins deux plis et que d'autre part, les deux plis sont sollicités d'une manière symétrique à la traction.
Les deux plis de tissu constituant l'armature de la bande peuvent tre identiques ou différents. Par exemple, le pli supérieur placé du côté concave lorsque la bande est mise en auge, peut avoir une trame plus forte (en direction transversale) et une chaîne plus faible, le pli inférieur ayant une chaîne plus forte.
Dans la bande décrite, chaque élément de nylon se trouve enveloppé sur plusieurs côtés d'une épaisseur notable de mélange ignifuge qui arrte la propagation de la combustion. Si l'on maintient une partie de ces bandes dans une flamme très chaude, par exemple 11000, on constate que la bande s'éteint quand on la retire de la flamme: la combustion ne se propage pas.
Comme la bande est renforcée par deux nappes de tissu de nylon à structure ouverte , séparées par une épaisseur de mélange caoutchouteux au moins égale à l'épaisseur des deux nappes de tissu, elle a une souplesse suffisante pour former une auge convenable mais pas excessive pour le transport de matériaux en blocs lourds.
La bande décrite présente encore l'avantage d'une meilleure tenue des bords qui sont unis aux revtements supérieurs et inférieurs comme dans toutes les bandes, mais qui sont aussi liés à la couche de caoutchouc intermédiaire. Dans les bandes usuelles, on observe souvent des décollements des bords qui s'accrochent mal sur l'armature, surtout quand elle a une épaisseur notable.
La masse caoutchouteuse intermédiaire, du fait de sa composition, empche le textile de brIller mme si celui-ci est mis à nu sur une face par arrachement des revtements. En effet, dans ce cas, les deux plis de tissu à structure ouverte sont parfaitement perméables aux gaz extincteurs éventuellement dégagés par la masse de mélange intermédiaire. Enfin, l'épaisseur de cette masse intermédiaire améliore considérablement la résistance aux chocs du textile constitutif des deux plis de tissu.
D'autres avantages sont inhérents à la bande décrite, tels que la souplesse longitudinale et transversale.
Le petit nombre de plis d'armature peut également conduire à une confection économique permettant d'obtenir un bas prix de revient. En outre, il a été constaté qu'avec certains mélanges à base de chlorure de polyvinyle et de caoutchouc au nitrile acrylique par exemple, qui présentent une haute imperméabilité aux gaz et de faibles caractéristiques mécaniques à chaud, on rencontre des difficultés notables de fabrication dans le cas des bandes à carcasse classique. Ces difficultés se manifestent par des cloques lors du démoulage après vulcanisation. Pour les éviter, il est nécessaire de refroidir la presse avant de démouler, ce qui est incommode et coûteux. La bande décrite ci-dessus, fabriquée avec des mélanges pouvant tre vulcanisés à base de chlorure de polyvinyle et de caoutchouc au nitrile acrylique, grâce à son homogénéité de structure, ne présente aucun de ces inconvénients.
Les mmes mélanges se révèlent pour les raisons indiquées pratiquement inutilisables dans le cas des carcasses classiques.
Conveyor belt
The present invention relates to a nylon fabric reinforced conveyor belt with an open structure.
We have already tried to use nylon in the reinforcement of conveyor belts because of its mechanical qualities, but nylon has the drawback of burning too easily.
Furthermore, for the reinforcement of conveyor belts, open mesh fabrics have been used, so as to achieve continuity of the rubber from one side of the fabric to the other in order to obtain better cohesion of the elements of the belt and to avoid detachments, internal, or a coating.
The conveyor belt according to the present invention, which makes it possible to avoid the drawbacks inherent in the combustibility of nylon, is characterized in that the reinforcement consists of two layers of fabric, separated by a thickness of rubber mass at least equal to the thickness of the two combined plies, the rubbery mass being incombustible and in the vulcanized state.
As flame-retardant rubber mass which can be vulcanized, mention may be made, for example, of chloroprene rubber (in particular rubber branded Neoprene), or else a mixture of polyvinyl chloride with acrylic nitrile rubber.
The appended drawing shows, by way of example, one embodiment of the strip according to the invention.
Fig. 1 is a schematic perspective view, cut transversely, and
figs. 2, 3 and 4 are partial longitudinal sections illustrating the formation of an endless belt.
The strip of FIG. 1 is reinforced with two plies (1) and (2) of nylon, of wide mesh fabric. Between these two plies, the center of the strip is formed of a layer (3) of incombustible rubber mass which can be vulcanized, for example a mixture of polyvinyl chloride with acrylic nitrile rubber. The faces are lined with outer coatings 4 and 5. On the edges extend beads 6 and 7 made of a rubber mixture which are integral with the entire thickness of the rubber.
The transverse stiffness, or body of the strip depends on the nature of the weft of the reinforcing fabric (diameter of the threads, density, etc.) and on the thickness and the modulus of elasticity of the rubber mixes.
Fig. 2 shows two ends 20 and 21 of a band 19 which is to be joined together so as to obtain an endless band.
Fig. 3 shows the state of the strip 19 after shelling and preparation: the coatings 25 and 26, on the end 20, as well as the intermediate layer 22 are removed so as to leave the fabrics 23 and 24 bare or provided with the usual mixture coating promoting adhesion but without extra thickness.
The two plies 23 and 24 of the end 20 are coated with an adhesive or a volatile solvent on their two faces and applied against each other. On the end 21 only the intermediate mixture 22 is removed. The two plies are coated on their internal face only.
Fig. 4 shows the final assembly which is vulcanized according to known techniques.
The two folds of the end 20 are sandwiched between the two folds of the end 21: the strip is closed on itself without any additional thickness and, if the length J is sufficient, without reduction in resistance since, on the one hand, , in all the sections there are at least two folds and that on the other hand, the two folds are stressed in a symmetrical manner in tension.
The two folds of fabric constituting the reinforcement of the strip may be identical or different. For example, the upper ply placed on the concave side when the web is troughed, may have a stronger weft (in the transverse direction) and a weaker warp, the bottom ply having a stronger warp.
In the strip described, each nylon element is wrapped on several sides with a noticeable thickness of flame retardant mixture which stops the spread of combustion. If we keep some of these bands in a very hot flame, for example 11000, we see that the band goes out when we remove it from the flame: the combustion does not propagate.
As the strip is reinforced by two plies of nylon fabric with an open structure, separated by a thickness of rubber compound at least equal to the thickness of the two plies of fabric, it has sufficient flexibility to form a suitable trough but not excessive to the transport of materials in heavy blocks.
The strip described also has the advantage of better holding of the edges which are united to the upper and lower coverings as in all the strips, but which are also linked to the intermediate rubber layer. In the usual bands, we often observe detachments of the edges which do not cling well to the reinforcement, especially when it has a notable thickness.
The intermediate rubbery mass, because of its composition, prevents the textile from burning even if the latter is exposed on one side by tearing off the coatings. In fact, in this case, the two folds of fabric with an open structure are perfectly permeable to the extinguishing gases possibly released by the mass of intermediate mixture. Finally, the thickness of this intermediate mass considerably improves the impact resistance of the constituent textile of the two plies of fabric.
Other advantages are inherent in the described strip, such as longitudinal and transverse flexibility.
The small number of reinforcing plies can also lead to economical preparation making it possible to obtain a low cost price. In addition, it has been found that with certain mixtures based on polyvinyl chloride and acrylic nitrile rubber, for example, which have high impermeability to gases and low mechanical characteristics when hot, notable manufacturing difficulties are encountered in the case of bands with a classic carcass. These difficulties are manifested by blisters during demolding after vulcanization. To avoid them, it is necessary to cool the press before demoulding, which is inconvenient and expensive. The strip described above, manufactured with mixtures which can be vulcanized based on polyvinyl chloride and acrylic nitrile rubber, thanks to its structural homogeneity, does not exhibit any of these drawbacks.
The same mixtures prove to be practically unusable for the reasons indicated in the case of conventional carcasses.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR799467A FR1238809A (en) | 1959-07-03 | 1959-07-03 | Advanced training in conveyor belts |
Publications (1)
Publication Number | Publication Date |
---|---|
CH368093A true CH368093A (en) | 1963-03-15 |
Family
ID=8716862
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH697062A CH408773A (en) | 1959-07-03 | 1960-06-30 | Method of joining two ends of a strip |
CH742560A CH368093A (en) | 1959-07-03 | 1960-06-30 | Conveyor belt |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH697062A CH408773A (en) | 1959-07-03 | 1960-06-30 | Method of joining two ends of a strip |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE592490A (en) |
CH (2) | CH408773A (en) |
FR (1) | FR1238809A (en) |
GB (1) | GB953208A (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3469676A (en) * | 1967-09-22 | 1969-09-30 | Fmc Corp | Self-troughing self-releasing conveyor |
US3546054A (en) * | 1968-06-20 | 1970-12-08 | William H Ross | Spliced conveyor belt and method of making same |
DE2458364C3 (en) * | 1974-12-10 | 1979-11-29 | Gummi-Jaeger Kg Gmbh & Cie, 3000 Hannover | Connection for the ends of belts of an endless rod belt conveyor for agricultural machines |
US4235120A (en) * | 1979-05-14 | 1980-11-25 | The Goodyear Tire & Rubber Company | Belt and methods of manufacture and splicing |
ATE54796T1 (en) * | 1985-08-27 | 1990-08-15 | Arnold Jaeger | PRESS BELT FOR ROUND BALERS. |
DE29613721U1 (en) * | 1996-08-08 | 1996-11-21 | Stahl Gurt Bandweberei | Replacement belt |
-
1959
- 1959-07-03 FR FR799467A patent/FR1238809A/en not_active Expired
-
1960
- 1960-06-30 CH CH697062A patent/CH408773A/en unknown
- 1960-06-30 CH CH742560A patent/CH368093A/en unknown
- 1960-06-30 BE BE592490A patent/BE592490A/en unknown
- 1960-07-04 GB GB23302/60A patent/GB953208A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1238809A (en) | 1960-08-19 |
CH408773A (en) | 1966-02-28 |
BE592490A (en) | 1960-10-17 |
GB953208A (en) | 1964-03-25 |
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