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WO1999004961A1 - Process and apparatus for manufacturing a tyre breaker band - Google Patents

Process and apparatus for manufacturing a tyre breaker band Download PDF

Info

Publication number
WO1999004961A1
WO1999004961A1 PCT/GB1998/002190 GB9802190W WO9904961A1 WO 1999004961 A1 WO1999004961 A1 WO 1999004961A1 GB 9802190 W GB9802190 W GB 9802190W WO 9904961 A1 WO9904961 A1 WO 9904961A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
cutting
producing
cut
unwound
Prior art date
Application number
PCT/GB1998/002190
Other languages
French (fr)
Inventor
Eric Holroyd
Colin Holroyd
Original Assignee
Holroyd Associates Limited
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 Holroyd Associates Limited filed Critical Holroyd Associates Limited
Priority to AU84541/98A priority Critical patent/AU8454198A/en
Publication of WO1999004961A1 publication Critical patent/WO1999004961A1/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • D04H3/07—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments otherwise than in a plane, e.g. in a tubular way
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • 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
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/156—Coating two or more articles simultaneously
    • 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
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/70—Annular breakers
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • D04H3/04—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments in rectilinear paths, e.g. crossing at right angles
    • 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
    • B29C2793/0027—Cutting off
    • 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
    • B29C2793/0063—Cutting longitudinally
    • 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
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
    • B29D2030/381—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre the inserts incorporating reinforcing parallel cords; manufacture thereof
    • 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
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
    • B29D2030/385—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre made by winding and joining a continuous reinforced rubber band onto a mandrel, to obtain a tubular article as an intermediate element in the manufacture of the insert
    • 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
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
    • B29D2030/385—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre made by winding and joining a continuous reinforced rubber band onto a mandrel, to obtain a tubular article as an intermediate element in the manufacture of the insert
    • B29D2030/386—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre made by winding and joining a continuous reinforced rubber band onto a mandrel, to obtain a tubular article as an intermediate element in the manufacture of the insert the tubular article being cut to obtain a flat, single-layer insert
    • 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
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B29K2105/10—Cords, strands or rovings, e.g. oriented cords, strands or rovings
    • B29K2105/101—Oriented
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/256—Sheets, plates, blanks or films

Definitions

  • the invention relates to improvements in tyre manufacture, particularly associated with the manufacture of breaker layer of a pneumatic tyre.
  • Breaker strip is generally formed as a flat strip having embedded therein a series of reinforcing wires, fibres or cords.
  • GB- A-2212455 As shown in UK Patent Applications GB- A-2212455 , GB- A-2212456, GB-A-2153759, GB-A-2084623, GB-A-2085494, GB-A-2085495 and GB-A- 2085496, it is commonly known to lay down a zig-zag formation of reinforcing wire, fibre or cord which can then be bonded with elastomeric material.
  • apparatus for manufacturing breaker material comprising means for producing tube of elastomeric material having longitudinally extending elongate reinforcement elements, and cutting means for cutting said tube helically.
  • the reinforcement elements are wires.
  • they may be fibres such as polymer fibres.
  • the means for producing tube comprises alignment means for aligning a plurality of reinforcement elements relative each other.
  • the alignment means may comprise a comb having a plurality of through holes. Reinforcement elements to be used in breaker strip are thereby supported through the apparatus.
  • the means for producing tube comprises a die arranged to receive a supply of elastomeric material and to form a tube of said material about reinforcement elements aligned by the alignment means.
  • the apparatus may comprise creel means for presenting a plurality of reinforcement elements to said means for producing tube.
  • the cutting means preferably comprises a blade arranged to rotate relative the means for producing tube, and coaxially with tube produced thereby. Accordingly a helical cut is made in a tube produced in the apparatus, and so a breaker strip can be formed having reinforcement elements oriented at an angle to its length.
  • Means may be provided for unwinding tube, which is rotatable about the axis of tube and arranged to receive helically cut tube from the cutting means such that said helically cut tube can be unwound.
  • the rotatable unwinding means may comprise a spool arranged to receive and store unwound tube.
  • a method of producing breaker material comprising the steps of forming a tube having longitudinally extending reinforcing elements, and cutting said tube helically.
  • the step of producing a tube may comprise the steps of feeding a plurality of reinforcing elements into a tube profile and extruding elastomeric material onto said elements.
  • the feeding step may comprise feeding the elements from a creel to an annular former.
  • the cutting step comprises the steps of rotating cutting means about the axis of the tube, feeding tube formed in the forming step past the cutting means and thereby causing a helical cut to be made in the tube.
  • the method comprises the step of unwinding the cut tube resulting from the cutting step.
  • the method further comprises the step of storing the unwound cut tube.
  • the step of storing the unwound cut tube may comprise winding the tube around a spool.
  • Figure 1 shows a side elevation of a breaker manufacturing station according to a specific embodiment of the invention
  • Figure 2 shows a side elevation of a breaker machine forming part of the station illustrated in Figure 1
  • Figure 3 shows a plan view of a ring die of the machine as illustrated in Figure 2;
  • Figure 4 shows a cross section of the ring die as indicated by arrows III-III of Figure 3
  • Figure 5 shows a schematic diagram showing tube produced in the machine as illustrated in Figure 2 and the orientation of a helical cut made therein in use
  • Figure 6 shows a cross section of the tube as indicated by the arrow VI- VI of Figure 5.
  • FIG. 1 shows a breaker manufacturing station 10 which comprises a creel house 12 for storing and dispensing reinforcement wire, and a breaker machine 14.
  • the creel house 12 comprises a plurality of spindles 16 on each of which are mounted spools 18 of reinforcement wire 20. Reinforcement wire 20 is fed from each spool 18 to a central orifice 22 and out towards the breaker machine 14.
  • the creel house 12 also includes an air conditioning system 24 which ensures that the wire is kept at optimum atmospheric conditions.
  • the breaker machine 14 comprises a ring die 26 which is supplied by two extruders 28. Each extruder 28 receives a supply 30 of elastomeric material which is urged towards the ring die 26 by a scroll feeder 32 driven by a drive motor 34.
  • a plurality of wires 20 is received from the creel house into a separating comb 36.
  • the comb 36 allows the wires to be spaced apart to prevent tangling, and includes means to sense if wire is present. That allows for the snapping of a wire to be detected.
  • the wires 20 separated by the comb 36 are then passed to a wire tensioner 38 which is operative to draw the wires from the creel house 12 into the breaker machine 14.
  • the wire tensioner 38 is driven by drive means which are omitted from the drawings for clarity.
  • the ring die 26 is generally toroidal, having upper and lower annular faces 40, 42.
  • the die 26 has a toroidal cavity 44 into which the scrolls 32 urge elastomeric material in use.
  • Extending from the upper face 40 to the cavity 44 is a plurality of parallel through holes 46.
  • the through holes are equispaced in a circle concentric with the die 26.
  • Each through hole 46 receives a wire 20 from the tensioner 38.
  • An annular channel 48 concentric with the die 26 extends from the lower face 42 to the toroidal cavity 44.
  • wires are received in the die 26 via the through holes 46 and pass into the toroidal cavity 44. There, they come into contact with elastomeric material, and the resultant reinforced tube is expelled from the die 26 via the channel 48.
  • the breaker machine further includes a cutter 50 which comprises an annular disc 52 having a cutting blade 54 mounted thereon.
  • the disc 52 is coaxial with the die and is rotatable with respect thereto. Accordingly the tube expelled from the die 26 is directed through the aperture in the annular disc 52.
  • the cutting blade 54 is mounted at an angle to the plane of the disc 52 and so as the tube passes through the disc, the cutter cuts a helical slit in the tube wall. That is best illustrated in Figure 5.
  • Figure 6 shows the orientation of the reinforcing wires 20 in the tube; the wires are longitudinally oriented and so the helical slit cuts across the wires.
  • the tube After passing through the cutter, the tube is passed to a spool 56.
  • the spool 56 is rotatable on an axis oriented at an angle to the horizontal substantially equal to the angle to the vertical of the slit formed by the cutter 50.
  • the spool 56 is supported on a turntable 58 arranged to rotate in unison with the cutter 50. Accordingly, the tube is wound onto the spool at the same time as being unravelled, so to produce a planar breaker strip.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Apparatus for manufacturing breaker material comprises means (26) for producing tube of elastomeric material. The tube so produced has longitudinally extending reinforcement elements (20). The apparatus further includes cutting means (54) for cutting the tube helically.

Description

PROCESS AND APPARATUS FOR MANUFACTURING A TYRE BREAKER BAND
The invention relates to improvements in tyre manufacture, particularly associated with the manufacture of breaker layer of a pneumatic tyre.
Breaker strip is generally formed as a flat strip having embedded therein a series of reinforcing wires, fibres or cords. As shown in UK Patent Applications GB- A-2212455 , GB- A-2212456, GB-A-2153759, GB-A-2084623, GB-A-2085494, GB-A-2085495 and GB-A- 2085496, it is commonly known to lay down a zig-zag formation of reinforcing wire, fibre or cord which can then be bonded with elastomeric material.
However, the machinery required for performing the techniques shown in those documents tend to be complex, due to their reciprocating nature. Furthermore, reciprocating machines tend to lead to high component stress. It is an object of the invention to provide apparatus and a method which will ameliorate the foregoing problems.
According to one aspect of the invention there is provided apparatus for manufacturing breaker material, the apparatus comprising means for producing tube of elastomeric material having longitudinally extending elongate reinforcement elements, and cutting means for cutting said tube helically.
Preferably, the reinforcement elements are wires. Alternatively, they may be fibres such as polymer fibres.
In that way, a seamless breaker strip can be formed with reinforcement elements extending at an angle to the longitudinal direction of the strip. Furthermore, the breaker strip so produced has cut edges, which can be advantageous in that bending stresses in looped edges are not encountered. A separate loop cutting step is not required since breaker strip emerges from the apparatus with cut edges. Preferably, the means for producing tube comprises alignment means for aligning a plurality of reinforcement elements relative each other.
The alignment means may comprise a comb having a plurality of through holes. Reinforcement elements to be used in breaker strip are thereby supported through the apparatus.
In a preferred embodiment of the invention, the means for producing tube comprises a die arranged to receive a supply of elastomeric material and to form a tube of said material about reinforcement elements aligned by the alignment means.
The apparatus may comprise creel means for presenting a plurality of reinforcement elements to said means for producing tube.
The cutting means preferably comprises a blade arranged to rotate relative the means for producing tube, and coaxially with tube produced thereby. Accordingly a helical cut is made in a tube produced in the apparatus, and so a breaker strip can be formed having reinforcement elements oriented at an angle to its length.
Means may be provided for unwinding tube, which is rotatable about the axis of tube and arranged to receive helically cut tube from the cutting means such that said helically cut tube can be unwound.
The rotatable unwinding means may comprise a spool arranged to receive and store unwound tube.
According to another aspect of the invention there is provided a method of producing breaker material comprising the steps of forming a tube having longitudinally extending reinforcing elements, and cutting said tube helically. The step of producing a tube may comprise the steps of feeding a plurality of reinforcing elements into a tube profile and extruding elastomeric material onto said elements.
The feeding step may comprise feeding the elements from a creel to an annular former.
In a preferred embodiment of the invention, the cutting step comprises the steps of rotating cutting means about the axis of the tube, feeding tube formed in the forming step past the cutting means and thereby causing a helical cut to be made in the tube.
Preferably, the method comprises the step of unwinding the cut tube resulting from the cutting step.
In a preferred embodiment of the invention the method further comprises the step of storing the unwound cut tube.
The step of storing the unwound cut tube may comprise winding the tube around a spool.
Further aspects and advantages of the invention will be apparent from the following description of a specific embodiment of apparatus in accordance with the invention with reference to the accompanying drawings, in which:
Figure 1 shows a side elevation of a breaker manufacturing station according to a specific embodiment of the invention;
Figure 2 shows a side elevation of a breaker machine forming part of the station illustrated in Figure 1
Figure 3 shows a plan view of a ring die of the machine as illustrated in Figure 2;
Figure 4 shows a cross section of the ring die as indicated by arrows III-III of Figure 3; Figure 5 shows a schematic diagram showing tube produced in the machine as illustrated in Figure 2 and the orientation of a helical cut made therein in use; and
Figure 6 shows a cross section of the tube as indicated by the arrow VI- VI of Figure 5.
Figure 1 shows a breaker manufacturing station 10 which comprises a creel house 12 for storing and dispensing reinforcement wire, and a breaker machine 14. The breaker machine
14 is arranged directly below the creel house 12 and receives reinforcement wire therefrom.
The creel house 12 comprises a plurality of spindles 16 on each of which are mounted spools 18 of reinforcement wire 20. Reinforcement wire 20 is fed from each spool 18 to a central orifice 22 and out towards the breaker machine 14.
The creel house 12 also includes an air conditioning system 24 which ensures that the wire is kept at optimum atmospheric conditions.
The breaker machine 14 comprises a ring die 26 which is supplied by two extruders 28. Each extruder 28 receives a supply 30 of elastomeric material which is urged towards the ring die 26 by a scroll feeder 32 driven by a drive motor 34.
Referring in particular to Figure 2, a plurality of wires 20 is received from the creel house into a separating comb 36. The comb 36 allows the wires to be spaced apart to prevent tangling, and includes means to sense if wire is present. That allows for the snapping of a wire to be detected. The wires 20 separated by the comb 36 are then passed to a wire tensioner 38 which is operative to draw the wires from the creel house 12 into the breaker machine 14. The wire tensioner 38 is driven by drive means which are omitted from the drawings for clarity.
From the wire tensioner 38, the wires 20 are fed into the ring die 26. That component is described below with reference to Figures 3 and 4. The ring die 26 is generally toroidal, having upper and lower annular faces 40, 42. The die 26 has a toroidal cavity 44 into which the scrolls 32 urge elastomeric material in use. Extending from the upper face 40 to the cavity 44 is a plurality of parallel through holes 46. The through holes are equispaced in a circle concentric with the die 26. Each through hole 46 receives a wire 20 from the tensioner 38.
An annular channel 48 concentric with the die 26 extends from the lower face 42 to the toroidal cavity 44.
In use, wires are received in the die 26 via the through holes 46 and pass into the toroidal cavity 44. There, they come into contact with elastomeric material, and the resultant reinforced tube is expelled from the die 26 via the channel 48.
Reverting to Figure 2, the breaker machine further includes a cutter 50 which comprises an annular disc 52 having a cutting blade 54 mounted thereon. The disc 52 is coaxial with the die and is rotatable with respect thereto. Accordingly the tube expelled from the die 26 is directed through the aperture in the annular disc 52.
The cutting blade 54 is mounted at an angle to the plane of the disc 52 and so as the tube passes through the disc, the cutter cuts a helical slit in the tube wall. That is best illustrated in Figure 5. Figure 6 shows the orientation of the reinforcing wires 20 in the tube; the wires are longitudinally oriented and so the helical slit cuts across the wires.
After passing through the cutter, the tube is passed to a spool 56. The spool 56 is rotatable on an axis oriented at an angle to the horizontal substantially equal to the angle to the vertical of the slit formed by the cutter 50. The spool 56 is supported on a turntable 58 arranged to rotate in unison with the cutter 50. Accordingly, the tube is wound onto the spool at the same time as being unravelled, so to produce a planar breaker strip.

Claims

1. Apparatus for manufacturing breaker material, the apparatus comprising means (26) for producing tube of elastomeric material having longitudinally extending reinforcement elements (20), and cutting means (54) for cutting said tube helically.
2. Apparatus according to claim 1 wherein the means (26), for producing tube comprises alignment means (36) for aligning a plurality of reinforcement elements relative each other.
3. Apparatus according to claim 2 wherein the alignment means comprises a comb (36) having a plurality of through holes.
4. Apparatus according to claim 2 or claim 3 wherein the means for producing tube comprises a die (26) arranged to receive a supply of elastomeric material and to form a tube of said material about reinforcement elements aligned by the alignment means (36).
5. Apparatus according to any preceding claim and further comprising creel means (12) for presenting a plurality of reinforcement elements to said means (26) for producing tube.
6. Apparatus according to any preceding claims wherein the cutting means (54) comprises a blade arranged to rotate relative the means for producing tube, and coaxially with tube produced thereby.
7. Apparatus according to claim 6 and further comprising means (56) for unwinding tube, said means being rotatable about the axis of tube and arranged to receive helically cut tube from the cutting means such that said helically cut tube can be unwound.
8. Apparatus according to claim 7 wherein the means for unwinding comprises a spool (56) arranged to receive and store unwound tube.
9. A method of producing breaker material comprising the steps of forming a tube having longitudinally extending reinforcing elements, and cutting said tube helically.
10. A method according to claim 9 wherein the step of producing a tube comprises the steps of feeding a plurality of reinforcing elements into a tube profile and extruding elastomeric material onto said wires.
11. A method according to claim 10 wherein the feeding step comprises feeding the elements from a creel to an annular former.
12. A method according to any one of claims 9 to 11 wherein the cutting step comprises the steps of rotating cutting means about the axis of the tube, feeding tube formed in the forming step past the cutting means and thereby causing a helical cut to be made in the tube.
13. A method according to claim 12 further comprising the step of unwinding the cut tube resulting from the cutting step.
14. A method according to claim 13 further comprising the step of storing the unwound cut tube.
15. A method according to claim 14 wherein the step of storing the unwound cut tube comprises winding the tube around a spool.
PCT/GB1998/002190 1997-07-23 1998-07-22 Process and apparatus for manufacturing a tyre breaker band WO1999004961A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU84541/98A AU8454198A (en) 1997-07-23 1998-07-22 Process and apparatus for manufacturing a tyre breaker band

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9715454.6 1997-07-23
GB9715454A GB2327394B (en) 1997-07-23 1997-07-23 Improvements in tyre manufacture

Publications (1)

Publication Number Publication Date
WO1999004961A1 true WO1999004961A1 (en) 1999-02-04

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Application Number Title Priority Date Filing Date
PCT/GB1998/002190 WO1999004961A1 (en) 1997-07-23 1998-07-22 Process and apparatus for manufacturing a tyre breaker band

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Country Link
AU (1) AU8454198A (en)
GB (1) GB2327394B (en)
WO (1) WO1999004961A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007025507A1 (en) * 2007-06-01 2008-12-04 Vmi - Az Extrusion Gmbh RingExtruder

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1278641A (en) * 1968-06-06 1972-06-21 Pirelli Continuous method of manufacturing a flat band-like element which incorporates a tension-resistant structure and products thereof
US3682222A (en) * 1970-01-06 1972-08-08 Steelastic Co Pneumatic tire having helical reinforcing filaments
US3837387A (en) * 1971-01-28 1974-09-24 Gates Rubber Co Breaker bands for pneumatic tire
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AT335863B (en) * 1971-02-12 1977-04-12 Steelastic Co Process for the production of a reinforced fabric, in particular as a reinforcing insert for pneumatic tires
DE2660019B1 (en) * 1976-11-22 1979-11-15 Schroecker Erika Method and device for manufacturing a reinforced belt for building belts for pneumatic tires

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GB2132573B (en) * 1982-12-16 1987-07-22 Bates W & A Ltd Manufacture of rubber layers or ply fabric for reinforced articles eg pneumatic tyres

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GB1278641A (en) * 1968-06-06 1972-06-21 Pirelli Continuous method of manufacturing a flat band-like element which incorporates a tension-resistant structure and products thereof
US3890925A (en) * 1969-08-05 1975-06-24 Owens Corning Fiberglass Corp Strand doctoring means
US3682222A (en) * 1970-01-06 1972-08-08 Steelastic Co Pneumatic tire having helical reinforcing filaments
US3837387A (en) * 1971-01-28 1974-09-24 Gates Rubber Co Breaker bands for pneumatic tire
AT335863B (en) * 1971-02-12 1977-04-12 Steelastic Co Process for the production of a reinforced fabric, in particular as a reinforcing insert for pneumatic tires
DE2432199A1 (en) * 1974-07-05 1976-01-22 Berstorff Gmbh Masch Hermann Mfr. of continuous steel cord strip for vehicle pneumatic tyres - where parallel steel wires of strip subtend angle with longitudinal direction of strip
DE2660019B1 (en) * 1976-11-22 1979-11-15 Schroecker Erika Method and device for manufacturing a reinforced belt for building belts for pneumatic tires

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AU8454198A (en) 1999-02-16
GB2327394B (en) 2001-06-13
GB2327394A (en) 1999-01-27
GB9715454D0 (en) 1997-09-24

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