GB2094223A

GB2094223A - Improvements in production of belt joints

Info

Publication number: GB2094223A
Application number: GB8107140A
Authority: GB
Original assignee: Fothergill and Harvey Ltd
Current assignee: Fothergill and Harvey Ltd
Priority date: 1981-03-06
Filing date: 1981-03-06
Publication date: 1982-09-15

Abstract

A belt joint in a belt of tear resistant material such as KEVLAR (Registered Trade Mark) is made by weaving the belt of the tear resistant material, punching a row or rows of slits 2 adjacent each end of the belt, inserting the convolutions 3 of a spirally wound plastics material coil through the slits 2, and passing a rod or tube 4 of plastics material through the interdigited loops of the spiral or spirals to unite the ends of the belt. <IMAGE>

Description

SPECIFICATION Improvements in the production of belt joints This invention relates to improvements in a method forthe production of belt joints.

A joint for a paper makers felt has been proposed in which temperature resistant material, such as Polyester is woven as a tape with a plurality of evenly spaced woven slits longitudinally thereof to accommodate the spirals of a spirally wound plastics material, the two sides of the strip being then folded back and stitched to one end of the felt with a similar tape stitched to the other end of the felt, the loops of the two plastics spirals being connected by a rod passed therethrough.

The method according to the present invention for the production of belt joints of a tear resistant textile material, comprises weaving a belt of tear resistant textile material, punching a row or rows of slits transversly adjacent each of the ends of the belt, placing the slits in each end in register, inserting the coils of a spirally wound plastics material through the slits in each end of the belt, folding one or both ends of the belt over on itself along the line of the slits, and passing a rod or tube of plastics material through the interdigited loops of the spiral to unite the ends of the belt.

Alternatively the belt may be formed of p.t.f.e.

coated glass fibre which is unsatisfactory if slitted to receive the plastics spiral coil, and the coil is affixed to a strip of tear resistant p.t.f.e. coated material by the method described and each strip is doubled on itself and welded to each side of the ends of the glass fibre belt.

The invention will be described with reference to the accompanying drawings:-, Figure 1 is an underneath plan of a finished belt, Figure 1A is an enlarged view of part of Figure 1, Figure2 is a section on line 2-2 Figure 1A, Figure 3 is a similar view to Figure 2 before assembly, Figure 4 is an underneath plan of an alternative embodiment; Figure 5 is an enlarged view of part of Figure 4, Figure 6 is a longitudinal section of the ends of the belt shown in Figure 4 and 5 before assembling, Figure 7 is an underneath plan similar to Figure 1 containing four rows of stitching.

Figure 8 is a diagrammatically longitudinal section showing tapes of a tear resistant material doubled on themselves and welded to the ends of a glass fibre belt.

In carrying out the method a belt 1 is woven from tear resistant fibres to form a material such as that sold underthe registered Trade Mark KEVLAR by Du pont de Namur & Co. The material is cut to width and of a length to form a belt and is punched transversely adjacent each end 1, la to form rows of evenly spaced slits 2.

The coils 3 of a spirally wound plastics coil are inserted through the slits 2 in one end of the belt and a second spiral coil is similarly applied to the opposite end of the belt.

The end 1 a of the belt is doubled on itself along the outer line of slits 2, and the end of the belt is laid over the end la with the two rows of slits in register as shown in Figures 2 and 3 and spirals of coils 3 are inserted through the slits 2, from the underside of the belt with the trailing end ib of the belt lying under the end la with the belt moving in the direction of the arrow.

A rod or tube 4 of a plastics material is inserted through the loops of the coils 3 a single coil may be employed with the spirals straightened out between the rows of slits 2. A single rod or tube 4 may similarly employed forthetwo rows as shown in Figures 4 - 6 both end la, ib of the belt are turned on themselves as shown in Figure 6 and the ends are welded to the belt after the coils 3 have been inserted through the slits 2.

The temperature for welding the tear resistant material may be as high as 400"C and the plastics rod or tube protects the spiral plastics coil which may melt at about 260"C.

The plastics spiral coil is preferably of polypropylene.

In the modification shown in Figure 7 to make an extra strong joint four rows of slots may be punched in the tear resistant material on both ends of the belt and each row is joined by a spiral 3.

The belt may have a smooth polished surface and pass between the nip of two driven rollers and the rod 4 or tube for protecting the coil from heat, when the ends are welded (Figure 4 - 6) also forms a ramp for preventing excessive flattening of the coils.

The material is coated with p.t.f.e. (polytetrafluoroethyiene) by dipping a plurality of times in liquid p.t.f.e. and one of the outer coatings may contain graphite to render the belt slightly conducting to prevent any static electricity generated during its travel from causing any dust to travel along the belt.

The belt is particularly applicable for carrying materials through a micro wave and radio frequency furnace where materials enter the furnace in a liquid state and are dried by A.C. fields arranged to subject the material on the belt to high frequency A.C.

The belt and joint should be of plastics material to remain anti-magnetic when passing through the micro wave or radio frequency furnace.

In a modification as applied to a glass fibre belt 6 as shown in Figure 8 a tape 5 of Kevlar (R.T.M.) or other high tear resistant textile material is treated as hereinbefore described and the folded over ends of the two tapers 5 are welded one on each side of the ends of the glass fibre belt 6 as the glass fibre belt will not stand up to having the ends bent over through 180tC.

1. A method forthe production of belt joints in a belt of a tear resistant textile material comprising weaving a belt of tear resistant textile material, punching a row or rows of slits transversly adjacent each of the ends of the belt, placing the slits in each end in register inserting the coils of a spirally wound plastics material through the slits in each end of the belt, folding one or both ends of the belt over on

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in the production of belt joints This invention relates to improvements in a method forthe production of belt joints. A joint for a paper makers felt has been proposed in which temperature resistant material, such as Polyester is woven as a tape with a plurality of evenly spaced woven slits longitudinally thereof to accommodate the spirals of a spirally wound plastics material, the two sides of the strip being then folded back and stitched to one end of the felt with a similar tape stitched to the other end of the felt, the loops of the two plastics spirals being connected by a rod passed therethrough. The method according to the present invention for the production of belt joints of a tear resistant textile material, comprises weaving a belt of tear resistant textile material, punching a row or rows of slits transversly adjacent each of the ends of the belt, placing the slits in each end in register, inserting the coils of a spirally wound plastics material through the slits in each end of the belt, folding one or both ends of the belt over on itself along the line of the slits, and passing a rod or tube of plastics material through the interdigited loops of the spiral to unite the ends of the belt. Alternatively the belt may be formed of p.t.f.e. coated glass fibre which is unsatisfactory if slitted to receive the plastics spiral coil, and the coil is affixed to a strip of tear resistant p.t.f.e. coated material by the method described and each strip is doubled on itself and welded to each side of the ends of the glass fibre belt. The invention will be described with reference to the accompanying drawings:-, Figure 1 is an underneath plan of a finished belt, Figure 1A is an enlarged view of part of Figure 1, Figure2 is a section on line 2-2 Figure 1A, Figure 3 is a similar view to Figure 2 before assembly, Figure 4 is an underneath plan of an alternative embodiment; Figure 5 is an enlarged view of part of Figure 4, Figure 6 is a longitudinal section of the ends of the belt shown in Figure 4 and 5 before assembling, Figure 7 is an underneath plan similar to Figure 1 containing four rows of stitching. Figure 8 is a diagrammatically longitudinal section showing tapes of a tear resistant material doubled on themselves and welded to the ends of a glass fibre belt. In carrying out the method a belt 1 is woven from tear resistant fibres to form a material such as that sold underthe registered Trade Mark KEVLAR by Du pont de Namur & Co. The material is cut to width and of a length to form a belt and is punched transversely adjacent each end 1, la to form rows of evenly spaced slits 2. The coils 3 of a spirally wound plastics coil are inserted through the slits 2 in one end of the belt and a second spiral coil is similarly applied to the opposite end of the belt. The end 1 a of the belt is doubled on itself along the outer line of slits 2, and the end of the belt is laid over the end la with the two rows of slits in register as shown in Figures 2 and 3 and spirals of coils 3 are inserted through the slits 2, from the underside of the belt with the trailing end ib of the belt lying under the end la with the belt moving in the direction of the arrow. A rod or tube 4 of a plastics material is inserted through the loops of the coils 3 a single coil may be employed with the spirals straightened out between the rows of slits 2. A single rod or tube 4 may similarly employed forthetwo rows as shown in Figures 4 - 6 both end la, ib of the belt are turned on themselves as shown in Figure 6 and the ends are welded to the belt after the coils 3 have been inserted through the slits 2. The temperature for welding the tear resistant material may be as high as 400"C and the plastics rod or tube protects the spiral plastics coil which may melt at about 260"C. The plastics spiral coil is preferably of polypropylene. In the modification shown in Figure 7 to make an extra strong joint four rows of slots may be punched in the tear resistant material on both ends of the belt and each row is joined by a spiral 3. The belt may have a smooth polished surface and pass between the nip of two driven rollers and the rod 4 or tube for protecting the coil from heat, when the ends are welded (Figure 4 - 6) also forms a ramp for preventing excessive flattening of the coils. The material is coated with p.t.f.e. (polytetrafluoroethyiene) by dipping a plurality of times in liquid p.t.f.e. and one of the outer coatings may contain graphite to render the belt slightly conducting to prevent any static electricity generated during its travel from causing any dust to travel along the belt. The belt is particularly applicable for carrying materials through a micro wave and radio frequency furnace where materials enter the furnace in a liquid state and are dried by A.C. fields arranged to subject the material on the belt to high frequency A.C. The belt and joint should be of plastics material to remain anti-magnetic when passing through the micro wave or radio frequency furnace. In a modification as applied to a glass fibre belt 6 as shown in Figure 8 a tape 5 of Kevlar (R.T.M.) or other high tear resistant textile material is treated as hereinbefore described and the folded over ends of the two tapers 5 are welded one on each side of the ends of the glass fibre belt 6 as the glass fibre belt will not stand up to having the ends bent over through 180tC. CLAIMS 1. A method forthe production of belt joints in a belt of a tear resistant textile material comprising weaving a belt of tear resistant textile material, punching a row or rows of slits transversly adjacent each of the ends of the belt, placing the slits in each end in register inserting the coils of a spirally wound plastics material through the slits in each end of the belt, folding one or both ends of the belt over on itself along the line of the slits, and passing a rod or tube of plastics material through the interdigited loops of the spiral to unite the ends of the belt. 2. A method for the production of belt joints as in claim 1, in which the tear resistant textile material is coated with p.t.f.e. 3. A method for the production of belt joints as in claims 1 or 2, in which the rod ortube is formed of p.t.f.e. 4. A method for the production of belt joints in which the spiral coil is formed of polypropylene, polycarbonate or nylon. 5. A method for the production of belt joints as in any of claims 1 - 3, in which the ends of each tape are doubled on themselves and welded to the ends of a glass fibre belt. 6. Amethodforthe production of beltjoints substantially as hereinbefore described with reference to the accompanying drawings. 7. A belt when produced substantially as described by the method of any of claims 1 - 6. New claims or amendments to claims filed on 20 Jan 1982 Superseded claims All New or amended claims:

1. A method for joining the ends of belts of a tear resistant textile material by means of coils threaded through both belt ends comprising weaving a belt of tear resistant textile material, punching a row or rows of slits transversly adjacent each of the ends of the belt, placing the slits in each end in register inserting by pushing the coils of a spirally wound plastics material through the slits in each end of the belt, folding one or both ends of the belt over on itself along the line of the slits, and passing a rod or tube of plastics material through the interdigited loops of the spiral to unite the ends of the belt.

2. A method for joining the ends of a tear resistant textile material by means of coils inserted through both belt ends comprising, weaving a belt of tear resistant material, punching two or more rows of slits transversly thereof adjacent each of the ends of the belt, placing the rows of slits in each end in register, pushing the turns or coils of a spirally wound plastics material through the slits in each row in each end of the belt, folding one or both ends of the belt over on itself along the lines of the outer most slits, and passing a rod or tube of plastics material through the interdigited loops of the spiral in each line.

3. A method for the production of belt joints as in claims 1 or 2, in which the tear resistant textile material is coated with P.T.F.E.

4. A method for the production of belt joints as in claims 1 to 3, in which the rod or tube is formed of P.T.F.E.

5. A method for the production of belt joints as in any of the preceeding claims, in which the spiral coil is formed of polypropylene, polycarbonate or nylon.

6. A method for the production of belt joints as in any of claims 1 to 5 in which the rows of slits are formed in strips or tapes doubled on themselves and welded to each side of the ends of a glass fibre belt.

7. A method for the production of belt joints substantially as hereinbefore described with refer ence to the accompanying drawings.

8. A belt when produced substantially as described by the method of any of claims 1 to 7.