WO1995011795A1 - A method of manufacturing edge sealed conveyor belts and other laminated belt products - Google Patents

A method of manufacturing edge sealed conveyor belts and other laminated belt products Download PDF

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Publication number
WO1995011795A1
WO1995011795A1 PCT/DK1994/000397 DK9400397W WO9511795A1 WO 1995011795 A1 WO1995011795 A1 WO 1995011795A1 DK 9400397 W DK9400397 W DK 9400397W WO 9511795 A1 WO9511795 A1 WO 9511795A1
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WO
WIPO (PCT)
Prior art keywords
edge
belt
groove
base web
effected
Prior art date
Application number
PCT/DK1994/000397
Other languages
French (fr)
Inventor
Erik Steffenaur
Original Assignee
Polymax A/S
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 Polymax A/S filed Critical Polymax A/S
Priority to AU79900/94A priority Critical patent/AU7990094A/en
Publication of WO1995011795A1 publication Critical patent/WO1995011795A1/en

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Classifications

    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/74—Moulding material on a relatively small portion of the preformed part, e.g. outsert moulding
    • B29C70/76—Moulding on edges or extremities of the preformed part
    • B29C70/763—Moulding on edges or extremities of the preformed part the edges being disposed in a substantial flat plane
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • 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
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/0026—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor an edge face with strip material, e.g. a panel edge
    • B29C63/003—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor an edge face with strip material, e.g. a panel edge continuously
    • 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
    • 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
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/137—Beaded-edge joints or bead seals
    • 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
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/22—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns
    • B29C66/221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns being in the form of a sinusoidal wave
    • 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
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/472—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially flat
    • B29C66/4722—Fixing strips to surfaces other than edge faces
    • 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
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/474—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially non-flat
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/0044—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for shaping edges or extremities
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/681—Component parts, details or accessories; Auxiliary operations
    • B29C70/683—Pretreatment of the preformed part, e.g. insert
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0081—Shaping techniques involving a cutting or machining operation before shaping
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • 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
    • B29C65/40—Applying molten plastics, e.g. hot melt
    • 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
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/024—Thermal pre-treatments
    • B29C66/0242—Heating, or preheating, e.g. drying
    • 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
    • B29C66/73—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7311—Thermal properties
    • B29C66/73115—Melting point
    • 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
    • B29C66/73—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7311—Thermal properties
    • B29C66/73115—Melting point
    • B29C66/73116—Melting point of different melting point, i.e. the melting point of one of the parts to be joined being different from the melting point of the other part
    • 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
    • B29C66/73—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0072—Roughness, e.g. anti-slip
    • B29K2995/0073—Roughness, e.g. anti-slip smooth
    • 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

Definitions

  • a method of manufacturing edge sealed conveyor belts and other laminated belt products is provided.
  • the present invention relates to a method of manu ⁇ facturing conveyor belts of the type having one or more lavers of a substantially non-stretchable base web c. ered one- or double sided by a layer a thermoplastic material, whereby at least the top or outer side of the belt appears with a tight coating of a suitably friction producing type, optionally with a stamped pattern in the surface of the coating, and even with the side edges of the belt covered by a suitable plastics material.
  • the cut belt edges may be sealed be a welding-on of previously produced plastic cords, the melting point of which is lower than that of the coatings of the belt, such that the welding of the cords or cord profiles can be effected without any significant distortion impact on the outer coating layer or layers on the belt.
  • the conditions for obtaining an effective welding will of course not be the best, and because the edge cord forms a projecting side portion of the belt it will be exposed to contact with various guiding means and thus to noticeable influences, whereby the edge chord may get loose, if it is not welded with utmost care.
  • the edge sealing may be effected with increased safety of a durable result, and according to the invention this is achievable by carrying out, upon the edge cutting of the belt, a cutting-in into the belt edge so as to cut back the base web to a short distance from the belt edge, whereafter the sealing material is applied in being extruded into the cutting track.
  • the sealing material may be anchored against the inwardly facing surface of the cover layer or layers on the belt, where ⁇ by, for example, it is easier to obtain a perfect weld ⁇ ing without damaging the exterior surface of the cover layer.
  • the sealing material will be at least partly embedded in a carrier groove in the belt edge, whereby it will be much better stabilized than when just welded to the cut edge face of the belt.
  • Fig. 1 is a perspective view illustrating the manu ⁇ facture of a belt according to the invention.
  • Fig. 2 is a corresponding view illustrating a sub ⁇ sequent edge treatment of the belt.
  • Fig. 3 is a similar view illustrating a further edge treatment.
  • Figs. 4-8 are sectional views of belts with diffe ⁇ rently shaped edge areas
  • Fig. 9 is a perspective view of a belt having late ⁇ ral support means
  • Fig. 10 is a perspective view further illustrating the edge treatment
  • Fig. 11 is a plan top view of an apparatus according to the invention.
  • a conveyor belt is produced by coating a base web 2 with surface layers 4 of a thermo ⁇ plastic material.
  • Raw belts of this design can be made with different widths, whereafter ready made belts of still further different widths can be made by longitudi ⁇ nal cutting of the edge portions of the raw belt, as illustrated by the subsequent belt piece 6.
  • the cut side edges 8 will show a sharp stratification of base web 2 and coatings 4.
  • the base web 2 will have exposed edges, thus with associated possibilities of projecting fibres, between which various foreign matter may be deposited, giving rise to environmental problems which should be avoided by a sealing of the edges.
  • a groove 10 in each of the cut edges 8 of the belt e.g. as shown in Fig. 2, such that the base web is removed from these areas.
  • This may be done with rotating cutter discs 12 during a firm guiding of the belt, e.g. between supporting rollers 14.
  • One of the discs may be position adjustable for enabling working of belts of different widths.
  • the prepared belt is moved through an apparatus for introducing a suitable filler material 18 into the groove, by means of a nozzle 16 or otherwise.
  • a suitable filler material 18 into the groove, by means of a nozzle 16 or otherwise.
  • this may be done concurrently at both edges with the belt in a lying position.
  • the sealing material may have a higher melting point than the material of the layers 34 or at least be heated to a temperature higher than the latter melting point, as the process may then relatively easily be controlled such that a local melting occurs at the said edge surface areas, without this leaving noticeably traces in the outer or visible surface of the cover layers.
  • the filling 18 may bulge somewhat out from the belt edge, see Fig. 4, or it may additionally cover the remaining edge surface as shown in Fig. 5.
  • Fig. 6 it is shown that the groove 10 may be shaped with a pointed bottom, while in Fig. 7 it is shown that it may be softly curved, though in that case a welding con ⁇ nection will not exhibit any large area of contact with the outer coatings 4.
  • Fig. 7 it is shown that it may be possible to use for the edge sealing an extruded string 20 thicker than the belt 6.
  • FIG. 8 An embodiment that is advantageous in practice is shown in Fig. 8; after the formation of the groove 10 the remaining, outstanding edge parts are just pressed together and directly joined by welding, preferably with an associated template shaping of the reshaped outer edge of the belt.
  • edge strip is glued to or welded into the surface coating of the conveyor belt, whereby the lower edge will be effec ⁇ tively sealed, but it will be appreciated that according to the invention even the outer edge can be sealed, this being done prior to the strip being wave-shaped. With dotted lines it is indicated that the edge strip may be premounted on a narrow carrier belt, which is then welded to the conveyor belt. To the extent such edge or carrier strips are relevant, laminated produces, even that kind of products will be comprised by the inven ⁇ tion.
  • Fig. 10 it is shown that the belt edge, after passing the cutter disc 12, may pass a heater 22, which, in any suitable manner, will heat the belt edge locally just before it reaches the extruder nozzle 16, here with the belt in a horizontal position. It is indicated that the nozzle 16 at its rear side projects slightly into the groove 8, such that the latter is expanded a little immediately prior to the introduction of the extrusion string 18. Thereafter the belt edge passes an outer pressing or shaping roller 24, which will press the string 18 somewhat inwardly, and then a pair of pressure rollers 26 pressing the expanded belt edge back into its normal thickness, whereby a good intrusion of the string material into the groove 8 will be ensured.
  • thermo sensor 28 At the front side of the extruder nozzle a thermo sensor 28 is shown, which controls the effect of the heater 22 as well as the effect of a non-illustrated heater at the nozzle head itself.
  • the apparatus shown in Fig. 11 comprises two opposed, mutually staggered apparatus units 30 and 32, each provided with the said main parts 12,16,24,26 for concurrent working of the two belt edges.
  • the unit 32 is mounted on a chassis 34, which, by means of screw spindles 36, may be adjusted to different belt widths.
  • suitable polymers such as PVC, PU and optionally PE, will be applicable.

Abstract

Laminated conveyor belts consisting of one or more layers of an unstretchable base web and a cover layer of a thermoplastic material present the problem that base web may become frayed along the edges and thus be unhygienic. It is known to weld a thermoplastic string onto the edges for sealing these, but according to the invention a clearly improved sealing is obtained by cutting a groove (8) in the edge in the level of the base web and extruding into the groove a filling (18) of thermoplastic material, which, internally, will get bonded to the side faces of the groove.

Description

A method of manufacturing edge sealed conveyor belts and other laminated belt products.
The present invention relates to a method of manu¬ facturing conveyor belts of the type having one or more lavers of a substantially non-stretchable base web c. ered one- or double sided by a layer a thermoplastic material, whereby at least the top or outer side of the belt appears with a tight coating of a suitably friction producing type, optionally with a stamped pattern in the surface of the coating, and even with the side edges of the belt covered by a suitable plastics material. The latter coverage is due to the fact that the relevant belts are normally produced in over-width sizes, from which they are cut into the desired width by a cutting of the lateral edges, whereby, along these cut edges, the base web will be exposed edgewise, typically occurring with outwardly projecting fiber ends, on and between which all possible materials can be deposited, thereby giving rise to environmental problems. Such problems will be avoided if the belt edges, after the cutting, are covered by a suitable covering material.
In DE-C-41 21 572 it has already been disclosed that the cut belt edges may be sealed be a welding-on of previously produced plastic cords, the melting point of which is lower than that of the coatings of the belt, such that the welding of the cords or cord profiles can be effected without any significant distortion impact on the outer coating layer or layers on the belt. However, the conditions for obtaining an effective welding will of course not be the best, and because the edge cord forms a projecting side portion of the belt it will be exposed to contact with various guiding means and thus to noticeable influences, whereby the edge chord may get loose, if it is not welded with utmost care.
It is the purpose of the invention to provide a method, by which the edge sealing may be effected with increased safety of a durable result, and according to the invention this is achievable by carrying out, upon the edge cutting of the belt, a cutting-in into the belt edge so as to cut back the base web to a short distance from the belt edge, whereafter the sealing material is applied in being extruded into the cutting track. When the base web has been removed from the area, the sealing material may be anchored against the inwardly facing surface of the cover layer or layers on the belt, where¬ by, for example, it is easier to obtain a perfect weld¬ ing without damaging the exterior surface of the cover layer. Besides, the sealing material will be at least partly embedded in a carrier groove in the belt edge, whereby it will be much better stabilized than when just welded to the cut edge face of the belt.
Moreover, it will then also be possible to make use of a sealing material having a higher melting tempera¬ ture than the cover layers on the belt, or, respective¬ ly, of material temperatures conditioning a real and durable welding together of the materials.
In the following the invention is described in more detail with reference to the drawing, in which:-
Fig. 1 is a perspective view illustrating the manu¬ facture of a belt according to the invention.
Fig. 2 is a corresponding view illustrating a sub¬ sequent edge treatment of the belt.
Fig. 3 is a similar view illustrating a further edge treatment.
Figs. 4-8 are sectional views of belts with diffe¬ rently shaped edge areas,
Fig. 9 is a perspective view of a belt having late¬ ral support means,
Fig. 10 is a perspective view further illustrating the edge treatment, and
Fig. 11 is a plan top view of an apparatus according to the invention.
According to Fig. 1 a conveyor belt is produced by coating a base web 2 with surface layers 4 of a thermo¬ plastic material. Raw belts of this design can be made with different widths, whereafter ready made belts of still further different widths can be made by longitudi¬ nal cutting of the edge portions of the raw belt, as illustrated by the subsequent belt piece 6. The cut side edges 8 will show a sharp stratification of base web 2 and coatings 4. Hereby the base web 2 will have exposed edges, thus with associated possibilities of projecting fibres, between which various foreign matter may be deposited, giving rise to environmental problems which should be avoided by a sealing of the edges.
According to the invention there is cut, for this purpose, a groove 10 in each of the cut edges 8 of the belt, e.g. as shown in Fig. 2, such that the base web is removed from these areas. This may be done with rotating cutter discs 12 during a firm guiding of the belt, e.g. between supporting rollers 14. One of the discs may be position adjustable for enabling working of belts of different widths.
Thereafter, see Fig. 3, the prepared belt is moved through an apparatus for introducing a suitable filler material 18 into the groove, by means of a nozzle 16 or otherwise. Optionally, this may be done concurrently at both edges with the belt in a lying position.
In case of welding it may be suitable to first arrange for a heating of the belt edge, prior to supply¬ ing the filler string 18. Given that the welding will be effected against edge surface areas of the plastic lay¬ ers 4 themselves, a very efficient welding is achievable with the use of a suitable plastics material. It is here important that the sealing material may have a higher melting point than the material of the layers 34 or at least be heated to a temperature higher than the latter melting point, as the process may then relatively easily be controlled such that a local melting occurs at the said edge surface areas, without this leaving noticeably traces in the outer or visible surface of the cover layers.
Optionally, the filling 18 may bulge somewhat out from the belt edge, see Fig. 4, or it may additionally cover the remaining edge surface as shown in Fig. 5. In Fig. 6 it is shown that the groove 10 may be shaped with a pointed bottom, while in Fig. 7 it is shown that it may be softly curved, though in that case a welding con¬ nection will not exhibit any large area of contact with the outer coatings 4. As shown, it will be possible to use for the edge sealing an extruded string 20 thicker than the belt 6.
An embodiment that is advantageous in practice is shown in Fig. 8; after the formation of the groove 10 the remaining, outstanding edge parts are just pressed together and directly joined by welding, preferably with an associated template shaping of the reshaped outer edge of the belt.
So far reference has been made to the edge finish¬ ing of conveyor belts, but the invention has a further perspective with respect to a corresponding finishing of other types of plate belts.
Thus, for example, it has been proposed, in connec¬ tion with conveyor belts, to use associated edge strips mounted upstanding from the surface of the conveyor belt, whereby the latter may hold a high degree of filling between the edge strips, these strips being mounted with such a waved configuration that they may readily participate in the belt movement about end rol¬ lers for the belt, while along the conveying stretch they will be stabilized against lateral tilting. Also these strips will exhibit edge surfaces that may com¬ prise a central web with surface coatings, so they may present quite the same material and environmental problems as the edges of the conveyor belt itself. A strip of this type is indicated in Fig. 9. The edge strip is glued to or welded into the surface coating of the conveyor belt, whereby the lower edge will be effec¬ tively sealed, but it will be appreciated that according to the invention even the outer edge can be sealed, this being done prior to the strip being wave-shaped. With dotted lines it is indicated that the edge strip may be premounted on a narrow carrier belt, which is then welded to the conveyor belt. To the extent such edge or carrier strips are relevant, laminated produces, even that kind of products will be comprised by the inven¬ tion.
In Fig. 10 it is shown that the belt edge, after passing the cutter disc 12, may pass a heater 22, which, in any suitable manner, will heat the belt edge locally just before it reaches the extruder nozzle 16, here with the belt in a horizontal position. It is indicated that the nozzle 16 at its rear side projects slightly into the groove 8, such that the latter is expanded a little immediately prior to the introduction of the extrusion string 18. Thereafter the belt edge passes an outer pressing or shaping roller 24, which will press the string 18 somewhat inwardly, and then a pair of pressure rollers 26 pressing the expanded belt edge back into its normal thickness, whereby a good intrusion of the string material into the groove 8 will be ensured.
At the front side of the extruder nozzle a thermo sensor 28 is shown, which controls the effect of the heater 22 as well as the effect of a non-illustrated heater at the nozzle head itself.
The apparatus shown in Fig. 11 comprises two opposed, mutually staggered apparatus units 30 and 32, each provided with the said main parts 12,16,24,26 for concurrent working of the two belt edges. The unit 32 is mounted on a chassis 34, which, by means of screw spindles 36, may be adjusted to different belt widths.
As extrusion material, suitable polymers such as PVC, PU and optionally PE, will be applicable.

Claims

C L A I M S :
1. A method of manufacturing conveyor belts or cor¬ responding belts of the type made with a substantially unstretchable base web, which, on one or preferably both sides, is provided with a coating layer of a thermoplas¬ tic material, by which method there is effected, along at least one of the opposed belt edges, a sealing of the edge in order to confine the edge of the base web behind an outer edge cover layer of a thermoplastic material in welded connection with the said coating layer or layers, characterized in that along the edge of an already pre¬ pared raw belt and preferably subsequent to an edge cut¬ ting thereof there is effected a cutting of a groove in the belt edge at the outside of the edge of the base web, whereafter, in the area outside this cut-in base web edge there is effected a groove filling by way of welding a thermoplastic material against or into the groove, such that this material is brought into welding connection with the interior surfaces of the coating layer or layers as exposed by the said groove cutting.
2. A method according to claim l, characterized in that a belt with a double-sided coating is worked so as to weld together the edge surface areas of the coating layers which, after the said edge groove cutting, are left freely projecting outside the outer edge of the base web.
3. A method according to claim 1, characterized in that the groove sealing is effected by extruding into the groove a thermoplastic mounding material, preferably at a temperature higher than the melting temperature of the coating material.
4. A method according to claim 3, characterized in that prior to the extrusion into the groove a preheating of the belt edge or at least the groove area itself is effected.
5. A method according to claim 3, characterized in that the extrusion material is supplied from a nozzle in a manner such that there is additionally supplied mate¬ rial to the outside of the belt edge area, the contour of this applied material subsequently being stabilized by passing a set of shaping rollers.
6. A method according to claim 3, characterized in that immediately prior to the inwardly directed extru¬ sion there is effected a slight expansion of the groove by an outward bending of at least one of the groove walls, and that the belt edge is subsequently pressed together for reestablishing a straight cross sectional shape.
7. An apparatus for performing the method according to claim 1, comprising means for advancing a laminated belt past a working station for applying a side edge sealing material, characterized in that upstream of the said working station there is provided a cutting station having means for cutting an edge recess or groove in the belt at the side edge of one or more layers of a base web therein, and that the working station is equipped with one or more extruder devises having nozzle means for extruding a sealing material into the recess or groove, preferably at both edges concurrently.
8. An apparatus according to claim 7, characterized in that next to the belt edge just in front of the nozzle means there is arranged means for a controlled local heating of the edge area of the belt, preferably co-controlled with means for heating the nozzle means.
PCT/DK1994/000397 1993-10-27 1994-10-27 A method of manufacturing edge sealed conveyor belts and other laminated belt products WO1995011795A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU79900/94A AU7990094A (en) 1993-10-27 1994-10-27 A method of manufacturing edge sealed conveyor belts and other laminated belt products

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK1205/93 1993-10-27
DK931205A DK120593D0 (en) 1993-10-27 1993-10-27 PROCEDURE FOR MANUFACTURING EDGE SEALED TRANSPORT BANDS AND OTHER LAMINATED BAND PRODUCTS

Publications (1)

Publication Number Publication Date
WO1995011795A1 true WO1995011795A1 (en) 1995-05-04

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DK (1) DK120593D0 (en)
WO (1) WO1995011795A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009065367A1 (en) * 2007-11-21 2009-05-28 Forbo Siegling Gmbh Method for producing a transport/drive belt
WO2012052354A3 (en) * 2010-10-22 2012-06-14 Kraussmaffei Technologies Gmbh Device and method for producing sandwich elements with an integrated seal
KR102016933B1 (en) * 2019-04-23 2019-09-02 진재경 Fabric layer cutting and separating apparatus of conveyor belt for blocking generation of dust

Citations (4)

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Publication number Priority date Publication date Assignee Title
US4667812A (en) * 1981-05-08 1987-05-26 Joy Manufacturing Company Conveyor belt assembly and method
DE3339589C2 (en) * 1983-11-02 1988-12-01 Phoenix Ag, 2100 Hamburg, De
DE3807814C1 (en) * 1988-03-10 1989-03-23 G. Siempelkamp Gmbh & Co, 4150 Krefeld, De Process for the continuous production of a conveyor belt from rubber
EP0521245A1 (en) * 1991-06-29 1993-01-07 FORBO International S.A. Conveyor belt and method of its manufacture

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4667812A (en) * 1981-05-08 1987-05-26 Joy Manufacturing Company Conveyor belt assembly and method
DE3339589C2 (en) * 1983-11-02 1988-12-01 Phoenix Ag, 2100 Hamburg, De
DE3807814C1 (en) * 1988-03-10 1989-03-23 G. Siempelkamp Gmbh & Co, 4150 Krefeld, De Process for the continuous production of a conveyor belt from rubber
EP0521245A1 (en) * 1991-06-29 1993-01-07 FORBO International S.A. Conveyor belt and method of its manufacture

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009065367A1 (en) * 2007-11-21 2009-05-28 Forbo Siegling Gmbh Method for producing a transport/drive belt
US8657978B2 (en) 2007-11-21 2014-02-25 Forbo Siegling Gmbh Method for producing a transport/drive belt
WO2012052354A3 (en) * 2010-10-22 2012-06-14 Kraussmaffei Technologies Gmbh Device and method for producing sandwich elements with an integrated seal
KR102016933B1 (en) * 2019-04-23 2019-09-02 진재경 Fabric layer cutting and separating apparatus of conveyor belt for blocking generation of dust

Also Published As

Publication number Publication date
DK120593D0 (en) 1993-10-27
AU7990094A (en) 1995-05-22

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