WO2011053232A1 - Device and method for producing endless rubber elements - Google Patents

Device and method for producing endless rubber elements Download PDF

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Publication number
WO2011053232A1
WO2011053232A1 PCT/SE2010/051156 SE2010051156W WO2011053232A1 WO 2011053232 A1 WO2011053232 A1 WO 2011053232A1 SE 2010051156 W SE2010051156 W SE 2010051156W WO 2011053232 A1 WO2011053232 A1 WO 2011053232A1
Authority
WO
WIPO (PCT)
Prior art keywords
rubber
holder
mould part
end portions
mould
Prior art date
Application number
PCT/SE2010/051156
Other languages
French (fr)
Inventor
Tore Nilsson
Original Assignee
Nolato Silikonteknik Ab
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 Nolato Silikonteknik Ab filed Critical Nolato Silikonteknik Ab
Priority to CN201080047470.3A priority Critical patent/CN102574330B/en
Publication of WO2011053232A1 publication Critical patent/WO2011053232A1/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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/36—Bending and joining, e.g. for making hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30—Electrical means
    • B29C65/305—Electrical means involving the use of cartridge heaters
    • 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
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
    • 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
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7841—Holding or clamping means for handling purposes
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B29C66/52211—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other for making endless tubular articles, e.g. endless inner tubes
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/526—Joining bars
    • B29C66/5261—Joining bars for forming coaxial connections, i.e. the bars to be joined forming a zero angle relative to each other
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/526—Joining bars
    • B29C66/5268—Joining bars characterised by their solid cross sections being non-circular, e.g. being elliptical, square or rectangular
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/63—Internally supporting the article during joining
    • 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
    • B29C66/69—General aspects of joining filaments 
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/725—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being hollow-walled or honeycombs
    • B29C66/7252—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being hollow-walled or honeycombs hollow-walled
    • B29C66/72523—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being hollow-walled or honeycombs hollow-walled multi-channelled or multi-tubular
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81433—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81433—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
    • B29C66/81435—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned comprising several parallel ridges, e.g. for crimping
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/843—Machines for making separate joints at the same time in different planes; Machines for making separate joints at the same time mounted in parallel or in series
    • B29C66/8432—Machines for making separate joints at the same time mounted in parallel or in series
    • 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
    • B29D99/00—Subject matter not provided for in other groups of this subclass
    • B29D99/0082—Producing articles in the form of closed loops, e.g. rings
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/108—Special methods for making a non-metallic packing
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9261—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools
    • B29C66/92651—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by using stops
    • B29C66/92655—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by using stops by using several stops
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints
    • B29L2031/265—Packings, Gaskets
    • 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

Definitions

  • the present invention relates to a device and a method for producing endless rubber elements.
  • Endless rubber elements also referred to as rubber packings
  • rubber packings are used in a number of different contexts, for example within the automotive and aeronautical industries for effecting a seal between parts which are put together.
  • rubber packings it is possible, for example, to attain air-tight or watertight closures.
  • electrically conductive rubber packings are also interesting, since, with the aid of these, electrically conductive casings or enclosures for the shielding of various components can be realized.
  • vulcanization also termed curing or compaction.
  • a number of vulcanization processes can be used to join together finite structures of rubber or rubber-like material to realize the said endless elements or rubber packings.
  • the process can comprise applying pressure to the structures and exposing these to heat.
  • a device having a tool which is heated to a temperature suitable for the vulcanization process in question is conventionally used.
  • two ends of the rubber finite structure are inserted into one end each of the device such that the ends are placed one against the other.
  • a connecting means also referred to as jointing rubber, is applied either before or after the insertion of the ends such that the connecting means is arranged between the said ends.
  • a pressure is applied by means of the said tool to the ends of the structure and the connecting means arranged therebetween, which pressure application, in combination with the heat exposure from the heated tool, effects a vulcanization which connects the ends of the structure.
  • One object of the present invention is to solve the above problems and provide a production method which allows a more rational production of endless rubber elements.
  • a particular object is to provide a device and a method which allow the production of more than one endless element per production cycle.
  • a device for producing endless rubber elements which comprises a tool having a first and a second mould part which are mutually joinable, is indicated, wherein the first mould part comprises an engagement portion, and a holder comprising at least two parallel grooves having a first and a second groove section, wherein the first and the second groove section of each groove are mutually separated by a gap which is realized by means of a through hole made in the holder, wherein each groove is configured such that a rubber- made finite structure, which is to form one of the said endless elements, is arrangable with such an extent in the groove that two end portions with associated end surfaces of the rubber structure are arranged facing each other and are situated in the said gap, wherein the holder is detachably applicable to a first of the said mould parts, and wherein the engagement portion, when the holder is applied to the first mould part, extends through the said through hole and into the said gap, and wherein the second mould part is arranged, when a finite structure is arranged with an extent
  • One advantage of the present invention according to the above is that, with the aid of a plurality of holders, each comprising a plurality of grooves, a plurality of endless rubber elements may be simultaneously produced from rubber finite structures. During the time that the plurality of rubber finite structures in a holder are joined together under pressure in a tool to form endless rubber elements, a second holder may be prepared with a plurality of finite structures.
  • the engagement portion of the first mould part has a recessed first engagement surface facing a recessed second engagement surface of the second mould part, which recesses of the first and the second engagement surface are arranged, as the mould parts are brought together, to define a number of cavities corresponding to the number of grooves in the holder and oriented in relation to the said grooves, each cavity having a cross section which is complementary to the cross section of a finite structure which is intended to be arranged in the groove in relation to which the cavity is oriented.
  • One advantage with this embodiment is that various types of profiles, whether of circular, square or some other shape of cross sectional area, may be used.
  • a preferred embodiment has the said grooves of first and second groove section arranged in the holder such that they have a rectilinear extent.
  • Another preferred embodiment is arranged such that at least two of the said gaps are realized by a common through hole.
  • the holder may also be made of a material consisting of aluminium, metal, ceramic, plastic or alloys thereof.
  • the advantage of making the holder in aluminium or metal is that it is hard-wearing.
  • the advantage of making the holder of a ceramic or plastic is that these materials do not conduct heat as well, which means that the dispersion of heat during the joining is limited.
  • a preferred embodiment comprises that the tool comprises a heating element for heating the said first mould part or the said second mould part.
  • the said tool comprises a pneumatic or hydraulic system for bringing together the said mould parts.
  • the advantage with this is that the tool may realize the pressure which is needed to obtain an effective vulcanization process.
  • a preferred method for producing endless elements from finite structures of cured rubber comprises arranging at least one of the said structures in a holder having at least two parallel grooves, each of which comprises a first and a second groove section separated by a gap which is realized by a through hole made in the holder, wherein each structure is arranged with such an extent in its respective groove that two end portions with associated end surfaces of the rubber structure are arranged facing each other and are situated in the said gap, arranging a connecting means between the end surfaces of each structure, placing the holder on a first mould part of a tool such that an engagement portion of the said first mould part extends through the said through hole into the said gap and is arranged under the said end portions, and applying pressure to the said end portions and the said connecting means by bringing together the said first mould part and a second mould part of the tool for mutual connection of the said end portions.
  • An advantage with the method according to the above is that, with the aid of a plurality of holders, the production of a plurality of endless rubber elements from rubber finite structures is allowed.
  • a mutual connection of the said end portions is effected by vulcanization.
  • an uncured rubber in pasty, solid or liquid form is chosen as the said connecting means.
  • the said end portions and connecting means are subjected to a heat treatment by heating of at least one of the said first and second mould part.
  • the said heat treatment is arranged to take place at a temperature of 150-220°C.
  • the engagement portion of the first mould part has a width corresponding to twice a diameter of the said finite structure.
  • the mould parts are brought together with such a force that a pressure within the range 80-100 kg/cm 2 is applied to the said end portions and the said connecting means.
  • the pressure together with the applied heat means that an effective vulcanization process is attained.
  • the endless elements are produced from finite structures of cured rubber, in which the rubber is chosen from the group consisting of natural rubber, synthetic rubber and rubber compounds.
  • Figure 1 shows a perspective view of a tool comprising two mould parts, and a holder.
  • Figure 2 shows a perspective view of a holder.
  • Figure 3 shows a perspective view of a tool.
  • Figures 4a-f show perspective views illustrating different stages in the production process according to the present invention.
  • Figure 5 shows a cross section along the line A-A in Figure 4d, in which the mould parts with rubber elements can be seen.
  • Figure 6 shows a perspective view of a holder having a rubber element which is placed in one of the grooves prior to undergoing vulcanization.
  • Figure 7 shows a perspective view of a rubber finite structure.
  • Figures 8a-d show a number of different profile views of an upper and lower mould part, depending on the type of endless rubber elements to be produced.
  • the endless rubber elements 401 can be used within a host of different fields for a host of different applications.
  • the elements can thus be used within the telecommunications industry and in this case constitute part of a shielding.
  • an electrically conductive closed encapsulation is required, sometimes also termed Faraday's cage. Should the capsulation need to be divisible, it is then required that the joint between the shielding, electrically conductive parts is provided with a likewise electrically conductive element or packing.
  • These elements are most often constituted by an electrically conductive finite structure 402, which is then vulcanized into an O-ring-like packing or endless element 401 in a jointing process.
  • the finite structures 402 can be hollow and thus have a tubular construction, or can alternatively be solid, depending on the field of application.
  • the device 100 comprises a holder 101 , and a tool 102 having two mould parts 103, 104 which can be mutually brought together.
  • the holder 101 is arranged on the lower mould part 104, so that an engagement element 105 of the lower mould part 104 fits into a through hole 201 in the holder.
  • the fit between the said engagement element 105 and the said through hole 201 effects a fixing of the holder 101 in relation to the lower mould part 104 of the tool 102.
  • inventive device 100 can comprise projections 106 of the lower mould part 104 which interact with recesses 107 in the holder 101 , which projections 106 and recesses 107 produce fixing points which contribute to the said fixing.
  • the holder 101 which can be seen more clearly from Figure 2 to which reference is now also made, comprises a plurality of grooves 203, in which each individual groove 203 has a first and a second groove section 204, 205 separated by means of a gap 202.
  • each groove 203 is intended to receive a rubber finite structure 402, which will be described in greater detail below.
  • the holder 101 can have a rectangular shape, as in the shown embodiment, but alternative embodiments are possible.
  • the holder 101 can be made of metal, for example aluminium, or alternatively of a ceramic, a plastic, or an alloy or mixture of any one of the aforesaid materials.
  • the choice of material can be determined, for example, on the basis of the production method for the holder 101 itself, wear resistance, weight, cost, availability and possible conductivity.
  • the holder 101 can have a plurality of grooves 203, each of which is divided into a first and a second groove section 204, 205.
  • the groove sections can be milled out in the holder 101 .
  • the groove sections 204, 205 of an individual groove 203 are separated by a gap 202 realized by the through hole 201 in the holder 101 .
  • a number of grooves 203 having a first and a second groove section 204, 205 can divide a common hole 201 .
  • the holder 101 has a plurality of parallel grooves 201 , in which an elongated, centrally arranged through hole 201 realizes a gap 202 which divides up each groove 203 into a first and a second groove section 204, 205.
  • the elongated hole 201 is arranged orthogonally in relation to the said groove sections 204, 205.
  • Each groove 203 with associated groove sections 204, 205 can have a rectilinear extent in the holder 101 , as in the shown embodiment, but it will be appreciated that alternative extents are possible.
  • the groove sections 204, 205 can vary in size and shape, depending on the type of element to be produced.
  • the tool 102 which can be seen more clearly from Figure 3 to which reference is now also made, comprises a first and a second mould part 103, 104, in which the first can constitute an upper mould part 103 and the second mould part can constitute a lower mould part 104.
  • Figure 3 shows the mould parts 103, 104 in a state in which they have not been brought together.
  • the lower mould part 104 comprises a base section supporting an elongated engagement portion 302.
  • the upper mould part 103 as in the shown embodiment, can also have a base section supporting an elongated engagement portion 301 .
  • the engagement portion 301 , 302 of the respective mould part 103, 104 has an engagement surface 304, 305 having a plurality of recesses 303 made therein.
  • the number of recesses 303 per engagement portion 301 , 302 normally corresponds to the number of grooves 203 in the holder 101 .
  • One or more heating elements are arranged in at least one of the upper and the lower mould part 103, 104, and preferably one or more heating elements are arranged in both the upper and in the lower mould part 103, 104.
  • the heating elements are arranged to heat the tool 102 of the inventive device 100 to a temperature suitable for the attainment of a vulcanization process.
  • the holder 101 is intended to be arranged on the lower mould part 104 so that the engagement portion 302 extends through the through hole 201 in the holder 101 . More precisely, the engagement portion 302 will be received in the gap 202 dividing each groove 203 into a first and a second groove section 204, 205.
  • the recesses in the engagement portion 302 of the lower mould part are positioned such that they are arranged in line with the grooves 203 in the holder 101 , whereby the grooves 203 acquire a substantially continuous extent.
  • the recesses 303 in the engagement surface 304, 305 of the engagement portion 301 , 302 in respectively the lower and upper mould part 103, 104 are positioned such that the said recesses, when the two mould parts 103, 104 are brought together, form a plurality of hollows or cavities.
  • Each cavity has a cross section tailored to the cross section of the rubber element to be produced.
  • the mutually facing, recessed surfaces of the engagement portions 301 , 302 of the mould parts are mirror images of each other, while they are asymmetrical for asymmetric elements.
  • the engagement portion 301 , 302 of the respective mould part can have a width corresponding to the width of the through hole 201 made in elongated form in the holder 101 .
  • the width of the engagement portions 301 , 302 can be narrower than the width of the hole 201 .
  • a suitable width of the engagement portions 301 , 302 of the mould parts corresponds to around twice a measurement of the cross section of the element to be produced.
  • the said engagement portions 301 , 302 can thus have a width within the range 3-6 mm.
  • the mould parts 103, 104 are arranged in a tool 102.
  • the tool 102 comprises an arrangement for bringing together the upper and the lower mould part 103, 104.
  • the arrangement can comprise a hydraulic or pneumatic system, or alternatively a manually operable system.
  • the arrangement is arranged so as to bring together the upper and the lower mould part 103, 104 with a predetermined pressure.
  • the endless rubber elements 401 to be made are produced according to the present invention from a rubber structure 402 which is finite from the outset.
  • the rubber can be of the type comprising natural rubber, synthetic rubber, silicone rubber or a rubber compound.
  • the produced rubber elements can have a profile diameter of preferably up to 10 mm and preferably a diameter within the range 3-5 mm, even though other dimensions are possible.
  • the rubber elements can further be produced from a material which is electrically conductive. In the production of electrically conductive rubber elements, silicone rubber can be mixed, for example, with conductive particles and possibly other additives.
  • a material comprising silicone rubber and carbon particles for example, can be used
  • a material comprising silicone rubber and silver-plated particles of glass, copper, aluminium or nickel, for example can be used.
  • the inventive device 100 can be used to produce endless rubber elements 401 , shown in Figure 7, by a vulcanization process in which the ends 502 of rubber finite structures 402 are connected during use by a connecting means 501 also termed jointing rubber.
  • the connecting means 501 can have a pasty, solid or liquid form.
  • a preferred variant is a pasty or paste-like connecting means 501 of tacky consistency.
  • This connecting means 501 is applied to at least one of the end surfaces 503 of each of the said rubber finite structures 402.
  • the end surfaces 503 of a structure can thereafter be brought together, whereby the connecting means 501 fastens together the two end surfaces 503. After this, a vulcanization process can be conducted with the aid of pressure and heat.
  • the produced elements consist of more than one material, so-called multi-material elements, or alternatively multi-component elements, these are best connected with a connecting means which uses the same hardening system as the dominant material of the rubber finite structures 402.
  • Figures 4a-f show an inventive embodiment of the process for producing endless rubber elements 401 from rubber finite structures 402 with the aid of the inventive device 100.
  • the holder 101 has been provided with rubber finite structures 402.
  • the holder 101 is provided with at least one such rubber finite structure 402.
  • the rubber finite structures 402 are placed in the holder 101 such that they each have an extent in their respective groove 203 and have end portions 502 with mutually facing end surfaces 503 arranged in the gap 202 separating the groove sections 204, 205 of the respective groove 203.
  • a connecting means 501 is arranged between the end surfaces 503 of each rubber finite structure 402 .
  • the holder 101 has been arranged in the tool 102. More precisely, the holder 101 is arranged on the lower mould part 104 such that its engagement portion 302 extends into the through hole 201 as has been described above. The recesses in the engagement portion 302 of the lower mould part 104 will here receive the end portions 502 of the finite structures with associated connected means 501 .
  • Figure 4d it is illustrated how the first, or upper, and the second, or lower, mould part 103, 104 are brought together to apply a pressure to the end portions 502 with associated connecting means 501 of the respective structure.
  • the heating elements of the mould parts make it possible to expose the end portions 502 and the connecting means 501 simultaneously to heat, preferably within the range 150-220°C, even though other temperatures may be possible.
  • the engagement portions 301 , 302 of the upper and the lower mould part 103, 104 can have a width corresponding to twice a measurement which, in this case, is double the element diameter.
  • a non-heated holder 101 makes the inventive device 100 easier to handle. In particular, it is easy to load/demould the holder 101 and to arrange it in and remove it from the tool 102.
  • the tool 102 is arranged to apply a pressure within the range 80-100 kg/cm 2 , even though other pressures can be found.
  • the pressure application in combination with the heat exposure initiates a vulcanization process in which the end portions 502 of the respective structure are connected and endless rubber elements 401 are realized.
  • the pressure application eliminates the gas bubbles and porosities which can arise in and close to the connecting means.
  • the mechanical properties can be impaired if gas bubbles and porosities remain.
  • the pressure which is generated between the connecting means 501 and the end portions 502 expels any air between the layers and guarantees secure contact and sealing between connecting means 501 and end portions 502.
  • Vulcanization systems which can be used can vary from a traditional sulphur vulcanization system to peroxides, or alternatively adhesive curing.
  • the tool 102 is illustrated with the mould parts 103, 104 separated.
  • the holder 101 containing the rubber elements is still in place in the tool 102.
  • the rubber finite structures 402 have now been vulcanized and form endless rubber elements 401 .
  • Figure 4f it is illustrated how the holder 101 containing the finished elements has been removed from the tool 102, while a new holder 101 which has been loaded with rubber finite structures 402 is ready to be placed in the tool 102.
  • the holder 101 can be reloaded with rubber finite structures 402. Since the holder 101 is not heated during the vulcanization process, the handling of the holder 101 , as stated above, is facilitated.
  • Figure 5 shows a cross section along the line A-A in Figure 4d once the upper and the lower mould part 103, 104 are brought together and are interacting with each other, and also shows the one or more rubber elements which are then under vulcanization.
  • the brought-together heated mould parts 103, 104 apply a pressure to the said rubber element(s) for a period sufficient to attain satisfactory vulcanization.
  • An enlarged part of the cross section is shown in Figure 5, which illustrates how the mould parts 103, 104 can interact.
  • the lower of the two mould parts has been provided with further smaller recesses 505 between the recesses 303 in which the rubber finite structures 402 are to be placed. These smaller recesses 505 facilitate trimming of the element undergoing vulcanization and some residual products can be collected in the smaller recesses 505.
  • the mould parts 103, 104 do not always need to be provided with these smaller recesses.
  • the vulcanization period depends on the dimension of the rubber finite structure(s) to be joined together by vulcanization.
  • the relatively short width of the two mould parts 103, 104, when at least one of these is heated, can result in shortening of the vulcanization time.
  • a rubber element having a diameter of around 4-5 mm can have a vulcanization time of about 1 minute. If the profile diameter increases, then the vulcanization time can also be increased.
  • a suitable vulcanization time for a rubber element having a diameter of around 15 mm is about 5-7 minutes.
  • the management of the production process is such that one or more persons, or alternatively a machine, can load a number of holders 101 separate from the tool 102 and then an operator places the holders 101 one after another in the tool 102 and subjects them to the vulcanization process.
  • the application of rubber finite structures 402 does not therefore need to take place in direct connection with the tool 102. It is though still possible to operate the machine such that an operator loads a holder 101 with finite structures 402 during the time that another holder 101 containing structures is arranged in the tool 102 for conductance of the vulcanization process. In particular, this process involving a single operator is suitable when the structures have a larger diameter, since the vulcanization time is then likely to be longer.
  • Figure 6 shows a perspective view of a holder 101 having a rubber finite structure 402 placed in one of the grooves prior to undergoing connection.
  • the rubber finite structure 402 has been placed in one of the grooves.
  • the respective end portion 502 with associated end surfaces 503 is placed with an extent in the respective groove section 204, 205 such that the two end portions 502, with associated end surfaces 503, are facing each other, and that these are situated in the gap 202 between the groove sections 204, 205 of the groove 203.
  • a connecting means 501 which connects the two end surfaces 503.
  • Figures 8a-d show a number of different profile views of an upper and lower mould part 103, 104 and, more especially, their recessed engagement surfaces.
  • the shape of the respective engagement surface 304, 305 depends on the type of elements to be connected.
  • Figure 8a shows how a respective engagement surface 304, 305 (shown in Figure 3) may look if a finite structure 402 of circular cross section is to be connected.
  • each recess is semi-circular in shape.
  • the second mould part 104 having the second engagement portion 302 also has the semi-circular shaped recess.
  • Figure 8b shows how engagement surfaces 304, 305 of the mould parts 103, 104 for a finite structure of rectangular cross section may look.
  • the mould parts 103, 104 are arranged much the same as in the case comprising a circular cross section, but now each recess of the respective engagement portion 301 , 302 is semi-rectangular in shape.
  • Figure 8c shows how engagement surfaces 304, 305 of the mould parts 103, 104 may look if a finite structure of triangular cross section is to be connected.
  • the mould parts 103, 104 are arranged much the same as in the case comprising a circular cross section, but now each recess of the respective engagement portion 301 , 302 has the shape of one half of the cross section of the triangular element.
  • Figure 8d shows how engagement surfaces 304, 305 of the mould parts 103, 104 may look for a finite structure of asymmetrical cross section.
  • each recess of the respective engagement portion 301 , 302 has the shape of one half of the cross section of the asymmetrical element.
  • the mould parts 103, 104 can be configured such that they can vulcanize a number of other elements, for example those which have a cross section in the shape of an ellipse, square, semi-circle, or alternatively any other profile.
  • the mould parts can alternatively be configured such that only one of the mould parts has recesses which correspond to an endless element of, for example, square or triangular shape.
  • the finite structures 402 are arranged such that a plane surface of the respective structure is facing the second mould part.
  • the second mould part has an engagement surface in which there are no recesses.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

Device and method for producing endless rubber elements with the aid of a tool having two mould parts which are joinable, wherein a holder having at least two parallel grooves separated by a gap can receive a rubber finite structure such that each of the said grooves has two end portions with associated end surfaces of the rubber element facing each other, and that these end surfaces are situated in the gap. The holder is detachably applicable to one of the mould parts. After this, the mould parts are brought together to effect a pressure-induced connection of each pair of end portions.

Description

Device and method for producing endless rubber elements
TECHNICAL FIELD
The present invention relates to a device and a method for producing endless rubber elements. PRIOR ART
Endless rubber elements, also referred to as rubber packings, are used in a number of different contexts, for example within the automotive and aeronautical industries for effecting a seal between parts which are put together. Through the use of rubber packings, it is possible, for example, to attain air-tight or watertight closures. Within the telecommunications industry, electrically conductive rubber packings are also interesting, since, with the aid of these, electrically conductive casings or enclosures for the shielding of various components can be realized.
This sets high requirements in respect of the production of endless rubber elements which are electrically tight.
One production method for producing an endless rubber element of this kind is vulcanization, also termed curing or compaction. A number of vulcanization processes can be used to join together finite structures of rubber or rubber-like material to realize the said endless elements or rubber packings. The process can comprise applying pressure to the structures and exposing these to heat.
When one of the said rubber structures is joined together to form an endless rubber element, a device having a tool which is heated to a temperature suitable for the vulcanization process in question is conventionally used. After this, two ends of the rubber finite structure are inserted into one end each of the device such that the ends are placed one against the other. A connecting means, also referred to as jointing rubber, is applied either before or after the insertion of the ends such that the connecting means is arranged between the said ends. Finally, a pressure is applied by means of the said tool to the ends of the structure and the connecting means arranged therebetween, which pressure application, in combination with the heat exposure from the heated tool, effects a vulcanization which connects the ends of the structure. The endless rubber element which is thereby realized is then taken out and the procedure repeated for the next element or rubber packing. A problem with this production method is that it only allows piece-by- piece production of endless elements. For the telecommunications industry, for example, in which large volumes are normally demanded, the conventional production method can entail long production times.
SUMMARY OF THE INVENTION
One object of the present invention is to solve the above problems and provide a production method which allows a more rational production of endless rubber elements. A particular object is to provide a device and a method which allow the production of more than one endless element per production cycle.
For the achievement of these objects, and also other objects which emerge from the following description, according to the present invention a device for producing endless rubber elements having the distinguishing features defined in Patent Claim 1 , and a method having the distinguishing features defined in Patent Claim 8, are indicated. Alternative embodiments of the invention are described in the independent patent claims.
More precisely, according to the present invention, a device for producing endless rubber elements, which comprises a tool having a first and a second mould part which are mutually joinable, is indicated, wherein the first mould part comprises an engagement portion, and a holder comprising at least two parallel grooves having a first and a second groove section, wherein the first and the second groove section of each groove are mutually separated by a gap which is realized by means of a through hole made in the holder, wherein each groove is configured such that a rubber- made finite structure, which is to form one of the said endless elements, is arrangable with such an extent in the groove that two end portions with associated end surfaces of the rubber structure are arranged facing each other and are situated in the said gap, wherein the holder is detachably applicable to a first of the said mould parts, and wherein the engagement portion, when the holder is applied to the first mould part, extends through the said through hole and into the said gap, and wherein the second mould part is arranged, when a finite structure is arranged with an extent in at least one of the grooves of the holder and as the mould parts are brought together, to interact with the engagement portion of the first mould part so as to effect a connection of each pair of end portions under the influence of pressure. One advantage of the present invention according to the above is that, with the aid of a plurality of holders, each comprising a plurality of grooves, a plurality of endless rubber elements may be simultaneously produced from rubber finite structures. During the time that the plurality of rubber finite structures in a holder are joined together under pressure in a tool to form endless rubber elements, a second holder may be prepared with a plurality of finite structures.
In an alternative embodiment, the engagement portion of the first mould part has a recessed first engagement surface facing a recessed second engagement surface of the second mould part, which recesses of the first and the second engagement surface are arranged, as the mould parts are brought together, to define a number of cavities corresponding to the number of grooves in the holder and oriented in relation to the said grooves, each cavity having a cross section which is complementary to the cross section of a finite structure which is intended to be arranged in the groove in relation to which the cavity is oriented.
One advantage with this embodiment is that various types of profiles, whether of circular, square or some other shape of cross sectional area, may be used.
A preferred embodiment has the said grooves of first and second groove section arranged in the holder such that they have a rectilinear extent.
Another preferred embodiment is arranged such that at least two of the said gaps are realized by a common through hole.
These two embodiments with regard to grooves and holes facilitate the production of the holder for the rubber elements.
The holder may also be made of a material consisting of aluminium, metal, ceramic, plastic or alloys thereof.
The advantage of making the holder in aluminium or metal is that it is hard-wearing. The advantage of making the holder of a ceramic or plastic is that these materials do not conduct heat as well, which means that the dispersion of heat during the joining is limited.
A preferred embodiment comprises that the tool comprises a heating element for heating the said first mould part or the said second mould part.
Through heating of the mould parts, a vulcanization process is attained when these mould parts are pressed around a rubber element, and an endless rubber element is thereby realized. In another preferred embodiment, the said tool comprises a pneumatic or hydraulic system for bringing together the said mould parts.
The advantage with this is that the tool may realize the pressure which is needed to obtain an effective vulcanization process.
A preferred method for producing endless elements from finite structures of cured rubber comprises arranging at least one of the said structures in a holder having at least two parallel grooves, each of which comprises a first and a second groove section separated by a gap which is realized by a through hole made in the holder, wherein each structure is arranged with such an extent in its respective groove that two end portions with associated end surfaces of the rubber structure are arranged facing each other and are situated in the said gap, arranging a connecting means between the end surfaces of each structure, placing the holder on a first mould part of a tool such that an engagement portion of the said first mould part extends through the said through hole into the said gap and is arranged under the said end portions, and applying pressure to the said end portions and the said connecting means by bringing together the said first mould part and a second mould part of the tool for mutual connection of the said end portions.
An advantage with the method according to the above is that, with the aid of a plurality of holders, the production of a plurality of endless rubber elements from rubber finite structures is allowed.
By a preferred method, a mutual connection of the said end portions is effected by vulcanization.
The advantage with this is that, by the vulcanization process, an endless rubber element may be realized.
Under a preferred method according to the above, an uncured rubber in pasty, solid or liquid form is chosen as the said connecting means.
In another preferred method according to the above, the said end portions and connecting means are subjected to a heat treatment by heating of at least one of the said first and second mould part. The said heat treatment is arranged to take place at a temperature of 150-220°C.
As a result of the said heat treatment and heating of at least one of the said mould parts, a vulcanization process may occur.
In a preferred embodiment, the engagement portion of the first mould part has a width corresponding to twice a diameter of the said finite structure. In a further preferred method, the mould parts are brought together with such a force that a pressure within the range 80-100 kg/cm2 is applied to the said end portions and the said connecting means.
The pressure together with the applied heat means that an effective vulcanization process is attained.
In another preferred embodiment, the endless elements are produced from finite structures of cured rubber, in which the rubber is chosen from the group consisting of natural rubber, synthetic rubber and rubber compounds.
DESCRIPTION OF DRAWINGS
Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The figures should not be regarded as a limitation of the present invention; instead, the figures are used to illustrate and acquire a better understanding of the invention.
Figure 1 shows a perspective view of a tool comprising two mould parts, and a holder.
Figure 2 shows a perspective view of a holder.
Figure 3 shows a perspective view of a tool.
Figures 4a-f show perspective views illustrating different stages in the production process according to the present invention.
Figure 5 shows a cross section along the line A-A in Figure 4d, in which the mould parts with rubber elements can be seen.
Figure 6 shows a perspective view of a holder having a rubber element which is placed in one of the grooves prior to undergoing vulcanization.
Figure 7 shows a perspective view of a rubber finite structure.
Figures 8a-d show a number of different profile views of an upper and lower mould part, depending on the type of endless rubber elements to be produced.
DETAILED DESCRIPTION
In Figure 1 , to which reference is made, an inventive device 100 for producing endless rubber elements 401 is illustrated.
The endless rubber elements 401 , also referred to as rubber packings, can be used within a host of different fields for a host of different applications. The elements can thus be used within the telecommunications industry and in this case constitute part of a shielding. For the shielding of sensitive electronics, an electrically conductive closed encapsulation is required, sometimes also termed Faraday's cage. Should the capsulation need to be divisible, it is then required that the joint between the shielding, electrically conductive parts is provided with a likewise electrically conductive element or packing. These elements are most often constituted by an electrically conductive finite structure 402, which is then vulcanized into an O-ring-like packing or endless element 401 in a jointing process. The finite structures 402 can be hollow and thus have a tubular construction, or can alternatively be solid, depending on the field of application.
The device 100 comprises a holder 101 , and a tool 102 having two mould parts 103, 104 which can be mutually brought together.
The holder 101 is arranged on the lower mould part 104, so that an engagement element 105 of the lower mould part 104 fits into a through hole 201 in the holder. The fit between the said engagement element 105 and the said through hole 201 effects a fixing of the holder 101 in relation to the lower mould part 104 of the tool 102.
In addition, the inventive device 100, as in the shown embodiment, can comprise projections 106 of the lower mould part 104 which interact with recesses 107 in the holder 101 , which projections 106 and recesses 107 produce fixing points which contribute to the said fixing.
The holder 101 , which can be seen more clearly from Figure 2 to which reference is now also made, comprises a plurality of grooves 203, in which each individual groove 203 has a first and a second groove section 204, 205 separated by means of a gap 202. In the production of rubber elements, or rubber packings, each groove 203 is intended to receive a rubber finite structure 402, which will be described in greater detail below.
The holder 101 can have a rectangular shape, as in the shown embodiment, but alternative embodiments are possible.
The holder 101 can be made of metal, for example aluminium, or alternatively of a ceramic, a plastic, or an alloy or mixture of any one of the aforesaid materials. The choice of material can be determined, for example, on the basis of the production method for the holder 101 itself, wear resistance, weight, cost, availability and possible conductivity.
As stated above, the holder 101 can have a plurality of grooves 203, each of which is divided into a first and a second groove section 204, 205. The groove sections can be milled out in the holder 101 . The groove sections 204, 205 of an individual groove 203 are separated by a gap 202 realized by the through hole 201 in the holder 101 . A number of grooves 203 having a first and a second groove section 204, 205 can divide a common hole 201 . From the shown embodiment it can be seen that the holder 101 has a plurality of parallel grooves 201 , in which an elongated, centrally arranged through hole 201 realizes a gap 202 which divides up each groove 203 into a first and a second groove section 204, 205. The elongated hole 201 is arranged orthogonally in relation to the said groove sections 204, 205. Each groove 203 with associated groove sections 204, 205 can have a rectilinear extent in the holder 101 , as in the shown embodiment, but it will be appreciated that alternative extents are possible.
The groove sections 204, 205 can vary in size and shape, depending on the type of element to be produced.
The tool 102, which can be seen more clearly from Figure 3 to which reference is now also made, comprises a first and a second mould part 103, 104, in which the first can constitute an upper mould part 103 and the second mould part can constitute a lower mould part 104.
Figure 3 shows the mould parts 103, 104 in a state in which they have not been brought together.
The lower mould part 104 comprises a base section supporting an elongated engagement portion 302. The upper mould part 103, as in the shown embodiment, can also have a base section supporting an elongated engagement portion 301 .
In the shown embodiment, the engagement portion 301 , 302 of the respective mould part 103, 104 has an engagement surface 304, 305 having a plurality of recesses 303 made therein. The number of recesses 303 per engagement portion 301 , 302 normally corresponds to the number of grooves 203 in the holder 101 .
One or more heating elements are arranged in at least one of the upper and the lower mould part 103, 104, and preferably one or more heating elements are arranged in both the upper and in the lower mould part 103, 104. The heating elements are arranged to heat the tool 102 of the inventive device 100 to a temperature suitable for the attainment of a vulcanization process.
As stated above, the holder 101 is intended to be arranged on the lower mould part 104 so that the engagement portion 302 extends through the through hole 201 in the holder 101 . More precisely, the engagement portion 302 will be received in the gap 202 dividing each groove 203 into a first and a second groove section 204, 205. The recesses in the engagement portion 302 of the lower mould part are positioned such that they are arranged in line with the grooves 203 in the holder 101 , whereby the grooves 203 acquire a substantially continuous extent.
The recesses 303 in the engagement surface 304, 305 of the engagement portion 301 , 302 in respectively the lower and upper mould part 103, 104 are positioned such that the said recesses, when the two mould parts 103, 104 are brought together, form a plurality of hollows or cavities. Each cavity has a cross section tailored to the cross section of the rubber element to be produced.
In the production of symmetrical elements, the mutually facing, recessed surfaces of the engagement portions 301 , 302 of the mould parts are mirror images of each other, while they are asymmetrical for asymmetric elements.
It is also conceivable that the recesses, when the mould parts 103,
104 are brought together, form hollows or cavities of elliptical cross section, which recesses 303 are intended for the production of elements of circular cross section.
The engagement portion 301 , 302 of the respective mould part can have a width corresponding to the width of the through hole 201 made in elongated form in the holder 101 . Alternatively, the width of the engagement portions 301 , 302 can be narrower than the width of the hole 201 . A suitable width of the engagement portions 301 , 302 of the mould parts corresponds to around twice a measurement of the cross section of the element to be produced. For a rubber element having a circular cross section of 1 .5-3 mm diameter, the said engagement portions 301 , 302 can thus have a width within the range 3-6 mm.
In the shown embodiment, the mould parts 103, 104 are arranged in a tool 102. The tool 102 comprises an arrangement for bringing together the upper and the lower mould part 103, 104. The arrangement can comprise a hydraulic or pneumatic system, or alternatively a manually operable system. The arrangement is arranged so as to bring together the upper and the lower mould part 103, 104 with a predetermined pressure.
The endless rubber elements 401 to be made are produced according to the present invention from a rubber structure 402 which is finite from the outset. The rubber can be of the type comprising natural rubber, synthetic rubber, silicone rubber or a rubber compound. The produced rubber elements can have a profile diameter of preferably up to 10 mm and preferably a diameter within the range 3-5 mm, even though other dimensions are possible. The rubber elements can further be produced from a material which is electrically conductive. In the production of electrically conductive rubber elements, silicone rubber can be mixed, for example, with conductive particles and possibly other additives.
In the production of antistatic-shielding endless elements, a material comprising silicone rubber and carbon particles, for example, can be used , and in the production of endless elements for shielding of electromagnetic radiation, a material comprising silicone rubber and silver-plated particles of glass, copper, aluminium or nickel, for example, can be used.
The inventive device 100 can be used to produce endless rubber elements 401 , shown in Figure 7, by a vulcanization process in which the ends 502 of rubber finite structures 402 are connected during use by a connecting means 501 also termed jointing rubber.
The connecting means 501 can have a pasty, solid or liquid form. A preferred variant is a pasty or paste-like connecting means 501 of tacky consistency. This connecting means 501 is applied to at least one of the end surfaces 503 of each of the said rubber finite structures 402. The end surfaces 503 of a structure can thereafter be brought together, whereby the connecting means 501 fastens together the two end surfaces 503. After this, a vulcanization process can be conducted with the aid of pressure and heat.
Where the produced elements consist of more than one material, so-called multi-material elements, or alternatively multi-component elements, these are best connected with a connecting means which uses the same hardening system as the dominant material of the rubber finite structures 402.
Figures 4a-f show an inventive embodiment of the process for producing endless rubber elements 401 from rubber finite structures 402 with the aid of the inventive device 100.
In Figure 4a, the tool 102 with constituent upper and lower mould part 103, 104, as well as the holder 101 which is placed alongside the tool 102, are illustrated.
In Figure 4b, the holder 101 has been provided with rubber finite structures 402. According to the present invention, the holder 101 is provided with at least one such rubber finite structure 402. The rubber finite structures 402 are placed in the holder 101 such that they each have an extent in their respective groove 203 and have end portions 502 with mutually facing end surfaces 503 arranged in the gap 202 separating the groove sections 204, 205 of the respective groove 203.
A connecting means 501 is arranged between the end surfaces 503 of each rubber finite structure 402 .
In Figure 4c, the holder 101 , with the endless rubber elements 401 arranged therein, has been arranged in the tool 102. More precisely, the holder 101 is arranged on the lower mould part 104 such that its engagement portion 302 extends into the through hole 201 as has been described above. The recesses in the engagement portion 302 of the lower mould part 104 will here receive the end portions 502 of the finite structures with associated connected means 501 .
In Figure 4d it is illustrated how the first, or upper, and the second, or lower, mould part 103, 104 are brought together to apply a pressure to the end portions 502 with associated connecting means 501 of the respective structure. The heating elements of the mould parts make it possible to expose the end portions 502 and the connecting means 501 simultaneously to heat, preferably within the range 150-220°C, even though other temperatures may be possible. As has been described above, the engagement portions 301 , 302 of the upper and the lower mould part 103, 104 can have a width corresponding to twice a measurement which, in this case, is double the element diameter. This means that a short heating zone is required, which allows a number of recesses to be used which, when the mould parts 103, 104 are brought together, form a number of hollows, while the holder 101 does not need to be heated. A non-heated holder 101 makes the inventive device 100 easier to handle. In particular, it is easy to load/demould the holder 101 and to arrange it in and remove it from the tool 102.
When the mould parts 103, 104 are brought together, the tool 102 is arranged to apply a pressure within the range 80-100 kg/cm2, even though other pressures can be found.
The pressure application in combination with the heat exposure initiates a vulcanization process in which the end portions 502 of the respective structure are connected and endless rubber elements 401 are realized.
The pressure application eliminates the gas bubbles and porosities which can arise in and close to the connecting means. The mechanical properties can be impaired if gas bubbles and porosities remain. The pressure which is generated between the connecting means 501 and the end portions 502 expels any air between the layers and guarantees secure contact and sealing between connecting means 501 and end portions 502.
Pressureless vulcanization can be found, but requires special vulcanization systems. Vulcanization systems which can be used can vary from a traditional sulphur vulcanization system to peroxides, or alternatively adhesive curing.
In Figure 4e, the tool 102 is illustrated with the mould parts 103, 104 separated. The holder 101 containing the rubber elements is still in place in the tool 102. The rubber finite structures 402 have now been vulcanized and form endless rubber elements 401 .
In Figure 4f, it is illustrated how the holder 101 containing the finished elements has been removed from the tool 102, while a new holder 101 which has been loaded with rubber finite structures 402 is ready to be placed in the tool 102. After the finished endless elements 401 has been removed from the holder 101 , the holder 101 can be reloaded with rubber finite structures 402. Since the holder 101 is not heated during the vulcanization process, the handling of the holder 101 , as stated above, is facilitated.
Figure 5 shows a cross section along the line A-A in Figure 4d once the upper and the lower mould part 103, 104 are brought together and are interacting with each other, and also shows the one or more rubber elements which are then under vulcanization. The brought-together heated mould parts 103, 104 apply a pressure to the said rubber element(s) for a period sufficient to attain satisfactory vulcanization. An enlarged part of the cross section is shown in Figure 5, which illustrates how the mould parts 103, 104 can interact. The lower of the two mould parts has been provided with further smaller recesses 505 between the recesses 303 in which the rubber finite structures 402 are to be placed. These smaller recesses 505 facilitate trimming of the element undergoing vulcanization and some residual products can be collected in the smaller recesses 505. The mould parts 103, 104 do not always need to be provided with these smaller recesses.
The vulcanization period depends on the dimension of the rubber finite structure(s) to be joined together by vulcanization. The relatively short width of the two mould parts 103, 104, when at least one of these is heated, can result in shortening of the vulcanization time. For example, a rubber element having a diameter of around 4-5 mm can have a vulcanization time of about 1 minute. If the profile diameter increases, then the vulcanization time can also be increased. A suitable vulcanization time for a rubber element having a diameter of around 15 mm is about 5-7 minutes.
The management of the production process is such that one or more persons, or alternatively a machine, can load a number of holders 101 separate from the tool 102 and then an operator places the holders 101 one after another in the tool 102 and subjects them to the vulcanization process. The application of rubber finite structures 402 does not therefore need to take place in direct connection with the tool 102. It is though still possible to operate the machine such that an operator loads a holder 101 with finite structures 402 during the time that another holder 101 containing structures is arranged in the tool 102 for conductance of the vulcanization process. In particular, this process involving a single operator is suitable when the structures have a larger diameter, since the vulcanization time is then likely to be longer.
Figure 6 shows a perspective view of a holder 101 having a rubber finite structure 402 placed in one of the grooves prior to undergoing connection. In the holder 101 according to the earlier description, the rubber finite structure 402 has been placed in one of the grooves. The respective end portion 502 with associated end surfaces 503 is placed with an extent in the respective groove section 204, 205 such that the two end portions 502, with associated end surfaces 503, are facing each other, and that these are situated in the gap 202 between the groove sections 204, 205 of the groove 203. Between the two end surfaces 503 there has been applied a connecting means 501 , which connects the two end surfaces 503.
Figures 8a-d show a number of different profile views of an upper and lower mould part 103, 104 and, more especially, their recessed engagement surfaces. The shape of the respective engagement surface 304, 305 depends on the type of elements to be connected.
Figure 8a shows how a respective engagement surface 304, 305 (shown in Figure 3) may look if a finite structure 402 of circular cross section is to be connected. In the first mould part 103 having the first engagement portion 301 , each recess is semi-circular in shape. The second mould part 104 having the second engagement portion 302 also has the semi-circular shaped recess. When the two mould parts are brought together, a circular cavity is formed, which is intended to receive the end portions 502 of the finite structure 402.
Figure 8b shows how engagement surfaces 304, 305 of the mould parts 103, 104 for a finite structure of rectangular cross section may look. The mould parts 103, 104 are arranged much the same as in the case comprising a circular cross section, but now each recess of the respective engagement portion 301 , 302 is semi-rectangular in shape.
Figure 8c shows how engagement surfaces 304, 305 of the mould parts 103, 104 may look if a finite structure of triangular cross section is to be connected. The mould parts 103, 104 are arranged much the same as in the case comprising a circular cross section, but now each recess of the respective engagement portion 301 , 302 has the shape of one half of the cross section of the triangular element.
Figure 8d shows how engagement surfaces 304, 305 of the mould parts 103, 104 may look for a finite structure of asymmetrical cross section.
The mould parts 103, 104 are arranged such that each recess of the respective engagement portion 301 , 302 has the shape of one half of the cross section of the asymmetrical element.
Apart from the abovementioned illustrative profiles, the mould parts 103, 104 can be configured such that they can vulcanize a number of other elements, for example those which have a cross section in the shape of an ellipse, square, semi-circle, or alternatively any other profile. The mould parts can alternatively be configured such that only one of the mould parts has recesses which correspond to an endless element of, for example, square or triangular shape. The finite structures 402 are arranged such that a plane surface of the respective structure is facing the second mould part.
In this case, the second mould part has an engagement surface in which there are no recesses.
The person skilled in the art will appreciate that the present invention is not just limited to the preferred embodiments which have been described above. A number of variants and modifications are possible within the scope of the appended patent claims.

Claims

PATENT CLAIMS
1 . Device (100) for producing endless rubber elements (401 ), comprising:
a tool (102) having a first and a second mould part (103, 104) which are mutually joinable, wherein the first mould part (104) comprises an engagement portion (302), and
a holder (101 ) comprising at least two parallel grooves (203) having a first and a second groove section (204, 205),
wherein the first and the second groove section (204, 205) of each groove (203) are mutually separated by a gap (202) which is realized by means of a through hole (201 ) made in the holder (101 ),
wherein each groove (203) is configured such that a rubber-made finite structure (402), which is to form one of the said endless elements (401 ), is arrangable with such an extent in the groove (203) that two end portions (502) with associated end surfaces (503) of the rubber structure are arranged facing each other and are situated in the said gap (202),
wherein the holder (101 ) is detachably applicable to a first of the said mould parts (104), and
wherein the engagement portion (302), when the holder (101 ) is applied to the first mould part (104), extends through the said through hole (201 ) and into the said gap (202), and
wherein the second mould part (103) is arranged, when a finite structure (402) is arranged with an extent in at least one of the grooves (203) of the holder (101 ) and as the mould parts (103, 104) are brought together, to interact with the engagement portion (302) of the first mould part (104) so as to effect a connection of each pair of end portions (502) under the influence of pressure.
2. Device according to Claim 1 , wherein the engagement portion (302) of the first mould part (104) has a recessed first engagement surface (305) facing a recessed second engagement surface (304) of the second mould part (103), which recesses of the first and the second engagement surface (304, 305) are arranged, as the mould parts (103, 104) are brought together, to define a number of cavities corresponding to the number of grooves (203) in the holder (101 ) and oriented in relation to the said grooves, each cavity having a cross section which is complementary to the cross section of a finite structure (402) which is intended to be arranged in the groove (203) in relation to which the cavity is oriented.
3. Device according to Claim 1 or 2, wherein the said grooves (203) having a first and second groove section (204, 205) have a rectilinear extent.
4. Device according to Claims 1 -3, wherein at least two of the said gaps (202) are realized by a common through hole (201 ).
5. Device according to Claims 1 -4, wherein the said holder (101 ) is made of a material consisting of aluminium, metal, ceramic, plastic or alloys thereof.
6. Device according to Claims 1 -5, in which the said tool (102) comprises a heating element for heating the said first mould part (104) or the said second mould part (103).
7. Device according to Claims 1 -6, in which the said tool (102) further comprises a pneumatic or hydraulic system for bringing together the said mould parts (103, 104).
8. Method for producing endless elements from finite structures of cured rubber (402), comprising
arranging at least one of the said structures in a holder (101 ) having at least two parallel grooves (203), each of which comprises a first and a second groove section (204, 205) separated by a gap (202) which is realized by a through hole (201 ) made in the holder (101 ),
wherein each structure is arranged with such an extent in its respective groove (203) that two end portions (502) with associated end surfaces (503) of the rubber structure are arranged facing each other and are situated in the said gap (202),
arranging a connecting means (501 ) between the end surfaces (503) of each structure,
placing the holder (101 ) on a first mould part (104) of a tool (102) such that an engagement portion (302) of the said first mould part (104) extends through the said through hole (201 ) into the said gap (202) and is arranged under the said end portions (502), applying pressure to the said end portions (502) and the said connecting means (501 ) by bringing together the said first mould part (104) and a second mould part (103) of the tool (102) for mutual connection of the said end portions (502).
9. Method according to Claim 8, wherein a mutual connection of the said end portions (502) is effected by vulcanization.
10. Method according to Claim 8, wherein an uncured rubber in pasty, solid or liquid form is chosen as the said connecting means (501 ).
1 1 . Method according to Claim 9 or 10, wherein the said end portions (502) and connecting means (501 ) are subjected to a heat treatment by heating of at least one of the said first and second mould part (103, 104).
12. Method according to Claim 1 1 , wherein the said heat treatment is arranged to take place at a temperature of 150-220°C.
13. Method according to Claim 8, wherein the engagement portion (302) of the first mould part (104) is arranged such that it has a width corresponding to twice a diameter of the said finite structure (402).
14. Method according to Claim 8, wherein the mould parts (103, 104) are brought together with such a force that a pressure within the range 80- 100 kg/cm2 is applied to the said end portions (502) and the said connecting means (501 ).
15. Method according to Claim 8, wherein the endless elements (401 ) are produced from finite structures of cured rubber (402), in which the rubber is chosen from the group consisting of natural rubber, synthetic rubber and rubber compounds.
PCT/SE2010/051156 2009-10-29 2010-10-26 Device and method for producing endless rubber elements WO2011053232A1 (en)

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Applications Claiming Priority (2)

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SE0901390.5 2009-10-29
SE0901390A SE0901390A1 (en) 2009-10-29 2009-10-29 Apparatus for producing endless rubber elements

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CN102574330A (en) 2012-07-11
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SE0901390A1 (en) 2010-09-21

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