GB2256181A - Belt joint. - Google Patents
Belt joint. Download PDFInfo
- Publication number
- GB2256181A GB2256181A GB9209816A GB9209816A GB2256181A GB 2256181 A GB2256181 A GB 2256181A GB 9209816 A GB9209816 A GB 9209816A GB 9209816 A GB9209816 A GB 9209816A GB 2256181 A GB2256181 A GB 2256181A
- Authority
- GB
- United Kingdom
- Prior art keywords
- belt
- joint
- thickness
- region
- reduced thickness
- 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.)
- Withdrawn
Links
- 210000001503 joint Anatomy 0.000 claims abstract description 12
- 239000000853 adhesive Substances 0.000 claims abstract description 7
- 230000001070 adhesive effect Effects 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 239000004744 fabric Substances 0.000 description 10
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 description 5
- 229920002313 fluoropolymer Polymers 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 239000003365 glass fiber Substances 0.000 description 3
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 229920003235 aromatic polyamide Polymers 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000004811 fluoropolymer Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 239000004831 Hot glue Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- B65G15/34—Belts or like endless load-carriers made of rubber or plastics with reinforcing layers, e.g. of fabric
-
- 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)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Belt Conveyors (AREA)
- Laminated Bodies (AREA)
Abstract
A joint in conveyor belting (10) comprises an adhesive (18) bonding together first and second regions of reduced thickness forming, respectively, leading edge (16) and trailing edge (14) regions of the bolt, the first region being cut away on its side which is the underside (12) of the bolt in use and the second region being cut away on its side which is the uppermost surface (13) of the belt in use, the overlapped butt joint so formed being underlain by a backing strip (17) secured to the underside (12). <IMAGE>
Description
BELT JOINT
This invention relates to a method of joining together ends of a length of conveyor belting and to a joint in a conveyor belt made by the method.
The present invention is mainly concerned with conveyor belts which comprise a reinforcement fabric, or substrate, usually made from a woven glass fibre fabric or a polyaramid fibre fabric which is coated on both sides with a fluoroplastic layer such as, for example, polytetrafluoroethylene (PTFE).
One of the requirements of belt joints is that the region where the belt is joined should be of similar thickness to the rest of the belt. Furthermore, the surface of the belt should ideally be smooth and have similar characteristics as the rest of the belt.
Many joints have been proposed in the past in an attempt to meet these requirements. Some such proposals have suggested removing the outer layers to expose the fabric reinforcement and interleaving additional fabrics or threads to form a patch which is then recoated with a fresh outer layer. Other proposals have used multi-layered fabrics as the reinforcement and have removed the outer layers to expose the reinforcement and then removed some of the threads of the different layers of the fabric over different longitudinal extents of the belt. In this way the two ends of the belt are effectively spliced together and a fresh outer coating reapplied to the exposed fabric. All of these earlier proposals are difficult to do at the workstation where the belt is used. Furthermore, they are very time consuming and often make joints of different thickness to the rest of the belt.
There is therefore a need for an improved belt joint made by a much simpler method of joining the ends of a length of conveyor belting.
An object of the present invention is to provide a join in a conveyor belt which is strong, does not add too much thickness to the belt in the region of the join, and presents a relatively smooth surface on the side of the conveyor belt which is in contact with the product to be conveyed by the belt.
According to one aspect of the present invention there is provided a method of joining a belt comprising the steps of producing a length of belt material with a first end that forms a leading edge of a joint when the belt is in use and a second end which forms a trailing edge of the joint when the belt is in use, cutting away that part of the underside surface of the first end to form a first region of reduced thickness of belt, cutting away that part of the outermost surface of the second end of the belt to form a second region of reduced thickness of belt, the combined thickness of the first and second regions of reduced thickness being no more than the thickness of the rest of the belt, forming the belt into an endless loop to bring a surface of each region of reduced thickness into mutual confrontation, and form an overlapping butt joint, applying an adhesive to one or both of the mutually confronting surfaces, bonding the mutually confronting surfaces together, and providing a backing strip of material on the underside of the belt in the vicinity of the joint.
According to a further aspect of the invention there is provided a belt joint comprising a length of belt material with a first end that forms a leading edge of a joint when the belt is in use and a second end which forms a trailing edge of the joint when the belt is in use, a part of the underside surface of the first end being cut away to form a first region of reduced thickness of belt, a part of the outermost surface of the second end of the belt being cut away to form a second region of reduced thickness of belt, the combined thickness of the first and second regions of reduced thickness being no more than the thickness of the rest of the belt, and the belt being formed into an endless loop to bring a surface of each region of reduced thickness into mutual confrontation, and form an overlapping butt joint, an adhesive having been applied to one or both of the mutually confronting surfaces to bond the mutually confronting surfaces together, a backing strip of material being further provided on the underside of the belt in the vicinity of the joint.
In a still further aspect of the present invention there is provided a belt having an overlapping butt joint formed in accordance with the method of the present invention.
The invention will now be described by way of an example with reference to the accompanying drawing, which shows a cross-sectional view through a belt joint constructed in accordance with the present invention.
Referring to the drawing, the belt 10 is made from a closed woven glass fibre fabric 11 overcoated on each side with a layer 12 of a fluoroplastic such as, for example, polytetrafluoroethylene (PTFE) to make a belt which is approximately 0.25 mm (0.010 inch) to 1.0 mm (0.040 inch) thick. In the drawing the uppermost surface 13 of the belt 10 is the surface on which a product or products is to be conveyed. In use the belt travels in the direction of arrow
A.
The belt 10 is joined end to end to make an endless conveyor belt by forming a joint in the following way.
Firstly, the uppermost surface 13 of the belt on the trailing edge region 14 of the joint is ground away to about half of its thickness. Then the underside surface 15 of the belt is ground away to about half the thickness of the belt at the leading edge region 16 of the belt. The parts which are ground away are accurately ground so that when the two ends are put together, the total thickness of the overlap is approximately the same as the rest of the belt.
An adhesive, for example a hot melt adhesive, typically a thermoplastics fluoropolymer is applied to the confronting faces of the overlap and the two ends are brought together to form an overlapping butt joint. The adhesive is allowed to set or harden to effect bonding. A liquid dispersion such as for example, aqueous PTFE, is applied to the confronting surfaces 18 of the belt prior to effecting the bond between the two ends. The purpose of the liquid dispersion is to increase the bond strength of the joint.
A backing strip 17 made of a glass fibre fabric and/or a polyaramid fibre of typically 0.08 mm (0.003 inch) or 0.13 mm (0.005 inch) thickness is bonded to the underside surface of the belt. The backing strip is of the same width as the belt and extends for a length at least equal to the length of the overlap. Preferably, the backing strip is twice the length of the overlap and is symmetrically positioned relative to the overlap.
Preferably the backing strip is bonded to the belt by means of a layer of thermoplastics fluoropolymer such as that used to bond the overlapping portions.
The provision of a backing strip results in a slight increase in the thickness of the belt but the upper surface of the belt is still reasonably smooth with no leading edges or steps to snag and cause failure. We have found that joints with backing strips have a strength of around 70% of the rest of the belt material whereas the same joint without a backing strip has a strength of about 20% of the rest of the belt.
Claims (8)
1. A method of joining a belt comprising the steps of producing a length of belt material with a first end that forms a leading edge of a joint when the belt is in use and a second end which forms a trailing edge of the joint when the belt is in use, cutting away that part of the underside surface of the first end to form a first region of reduced thickness of belt, cutting away that part of the outermost surface of the second end of the belt to form a second region of reduced thickness of belt, the combined thickness of the first and second regions of reduced thickness being no more than the thickness of the rest of the belt, forming the belt into an endless loop to bring a surface of each region of reduced thickness into mutual confrontation, and form an overlapping butt joint, applying an adhesive to one or both of the mutually confronting surfaces, bonding the mutually confronting surfaces together, and providing a backing strip of material on the underside of the belt in the vicinity of the joint.
2. A method as claimed in claim 1, in which the first and second regions of reduced thickness are of equal thickness.
3. A method as claimed in claim 1 or claim 2, in which the backing strip is twice the length of the overlap between first and second regions.
4. A method of joining together ends of a length of conveyor belting substantially as herein described with reference to the accompanying drawing.
5. A conveyor belt joint comprising a length of belt material with a first end that forms a leading edge of a joint when the belt is in use and a second end which forms a trailing edge of the joint when the belt is in use, a part of the underside surface of the first end being cut away to form a first region of reduced thickness of belt, a part of the outermost surface of the second end of the belt being cut away to form a second region of reduced thickness of belt, the combined thickness of the first and second regions of reduced thickness being no more than the thickness of the rest of the belt, and the belt being formed into an endless loop to bring a surface of each region of reduced thickness into mutual confrontation, and form an overlapping butt joint, an adhesive having been applied to one or both of the mutually confronting surfaces to bond the mutually confronting surfaces together, a backing strip of material being further provided on the underside of the belt in the vicinity of the joint.
6. A conveyor belt including a joint as claimed in claim 5 or as made by the method of any one of claims 1 to 4.
7. A conveyor belt which in operation has a top surface and an underside surface and comprises a first end of belt material joined by way of a joint to a second end, the first end forming a leading edge of the joint when the belt is in use and the second end forming a trailing edge of the joint, characterised in that part of the underside of the first end is cut away to form a first region of reduced thickness, a part of the top surface of the second end is cut away to form a second region of reduced thickness, the first and second ends are bonded together to form an overlapping butt joint where the combined thickness of the first and second regions is no more than the thickness of the rest of the belt, and a backing strip is bonded to the underside of the joint in the vicinity of the first and second regions.
8. A conveyor belt joint substantially as hereinbefore described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB919109827A GB9109827D0 (en) | 1991-05-07 | 1991-05-07 | Belt joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9209816D0 GB9209816D0 (en) | 1992-06-24 |
| GB2256181A true GB2256181A (en) | 1992-12-02 |
Family
ID=10694555
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB919109827A Pending GB9109827D0 (en) | 1991-05-07 | 1991-05-07 | Belt joint |
| GB9209816A Withdrawn GB2256181A (en) | 1991-05-07 | 1992-05-07 | Belt joint. |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB919109827A Pending GB9109827D0 (en) | 1991-05-07 | 1991-05-07 | Belt joint |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE9206110U1 (en) |
| GB (2) | GB9109827D0 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0933555A3 (en) * | 1998-01-28 | 2000-03-22 | Mol Belting Company | Conveyor belt joint |
| WO2008077026A3 (en) * | 2006-12-18 | 2008-12-11 | Alcan Packaging Flexible France | High release nip roll assembly |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB917260A (en) * | 1960-11-22 | 1963-01-30 | Kleber Colombes | Improvements in or relating to methods for joining belts |
| GB1436368A (en) * | 1973-11-28 | 1976-05-19 | Fothergill & Harvey Ltd | Endless fibre glass belting |
| GB2059539A (en) * | 1979-09-20 | 1981-04-23 | Pollard V Belt Ltd | Belt Joints |
| US4279676A (en) * | 1979-09-06 | 1981-07-21 | Morrison Company, Inc. | Process of making a belting joint |
| GB2200589A (en) * | 1986-12-18 | 1988-08-10 | Scapa Porritt Ltd | Dryer fabric seaming |
-
1991
- 1991-05-07 GB GB919109827A patent/GB9109827D0/en active Pending
-
1992
- 1992-05-06 DE DE9206110U patent/DE9206110U1/en not_active Expired - Lifetime
- 1992-05-07 GB GB9209816A patent/GB2256181A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB917260A (en) * | 1960-11-22 | 1963-01-30 | Kleber Colombes | Improvements in or relating to methods for joining belts |
| GB1436368A (en) * | 1973-11-28 | 1976-05-19 | Fothergill & Harvey Ltd | Endless fibre glass belting |
| US4279676A (en) * | 1979-09-06 | 1981-07-21 | Morrison Company, Inc. | Process of making a belting joint |
| GB2059539A (en) * | 1979-09-20 | 1981-04-23 | Pollard V Belt Ltd | Belt Joints |
| GB2200589A (en) * | 1986-12-18 | 1988-08-10 | Scapa Porritt Ltd | Dryer fabric seaming |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0933555A3 (en) * | 1998-01-28 | 2000-03-22 | Mol Belting Company | Conveyor belt joint |
| US6234304B1 (en) | 1998-01-28 | 2001-05-22 | Mol Belting Company | Conveyor belt joint |
| WO2008077026A3 (en) * | 2006-12-18 | 2008-12-11 | Alcan Packaging Flexible France | High release nip roll assembly |
| US7984741B2 (en) | 2006-12-18 | 2011-07-26 | Bemis Company, Inc. | High release nip roll assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| DE9206110U1 (en) | 1992-08-27 |
| GB9109827D0 (en) | 1991-06-26 |
| GB9209816D0 (en) | 1992-06-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |