WO2021154094A1 - Système de soudage et procédé de soudage de thermoplastique - Google Patents

Système de soudage et procédé de soudage de thermoplastique Download PDF

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Publication number
WO2021154094A1
WO2021154094A1 PCT/NO2021/050031 NO2021050031W WO2021154094A1 WO 2021154094 A1 WO2021154094 A1 WO 2021154094A1 NO 2021050031 W NO2021050031 W NO 2021050031W WO 2021154094 A1 WO2021154094 A1 WO 2021154094A1
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WIPO (PCT)
Prior art keywords
welding
thermoplastic
list
welded
welding system
Prior art date
Application number
PCT/NO2021/050031
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English (en)
Inventor
Lasse WILLUMSEN
Joachim TIDEMANN
Pål MELØY
Original Assignee
Polarplast As
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Application filed by Polarplast As filed Critical Polarplast As
Priority to NO20220794A priority Critical patent/NO20220794A1/en
Publication of WO2021154094A1 publication Critical patent/WO2021154094A1/fr

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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
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B29C65/3432—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding comprising several wires, e.g. in the form of several independent windings
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/3444—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint being a ribbon, band or strip
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3468—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
    • B29C65/348—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic with a polymer coating
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5042—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like covering both elements 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
    • B29C66/01—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
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said 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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/83—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
    • B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool 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
    • B29C66/82—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
    • B29C66/80—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
    • B29C66/8248—Pressure application by weights
    • 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
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B29K2705/08—Transition metals
    • B29K2705/10—Copper

Definitions

  • the invention relates to the welding of thermoplastic, more particularly a welding system for welding thermoplastic by means of a welding wire or welding band of metal which is applied to a welding path and which is heated by means of current and resistance in the welding wire or welding band.
  • thermoplastic electrofusion welding It is known from e.g. EP 0281347 B1 to attach thermoplastic by means of electrically conductive welding wires which are heated by means of resistance. Furthermore, it is known from US2012 / 0231272 to use a ‘welding electrode’ made of an electrically conductive welding wire wrapped in thermoplastic for so-called thermoplastic electrofusion welding.
  • the strength of a weld is less than the strength of the parts to be welded.
  • the inventor describes a welding system and method that increases the strength of the weld and reduces the level of skill needed to achieve a good welding.
  • the invention describes a welding system for welding thermoplastic parts together along a welding path.
  • the system comprises one or more pressure applicators for pressing the thermoplastic parts to be welded together, an adjustable electrical power source and electrical contact means for creating an electrical circuit by means of the power source.
  • the system further comprises a thermoplastic welding list to be applied to an outside of one of the thermoplastic parts to be welded
  • the thermoplastic welding list comprises a thermoplastic body, at least one welding line baked into or mounted on to the thermoplastic body and an insulating layer fastened to a side to be directed away from the thermoplastic part to be welded.
  • the system further comprises fastening means for fastening the welding list to one of the thermoplastic parts to be welded.
  • the thermoplastic part, onto which the welding list is applied must be thin enough for the heat from the welding line to penetrate through said thermoplastic part.
  • the invention also describes a method for welding two thermoplastic parts together using the mentioned welding system.
  • Figure 1 a - d shows different embodiments of a welding list.
  • Figure 2a and b shows an embodiment of a pressure device in a side view and top view respectively.
  • Figure 3 shows two thermoplastic parts to be welded with a welding list positioned at the lower side.
  • Figure 4 shows two parts to be welded with a welding list positioned at the upper side.
  • Fig. 4a shows the two parts after welding.
  • Figure 5 shows two parts to be welded with a connection part bridging a gap between them and two welding lists positioned at the lower side and a press beam on top of the connection part.
  • Figure 6 shows two parts to be welded with a connection part bridging a gap between them and two welding lists positioned at the upper side and a press beam on top.
  • Figure 7 shows an embodiment where a welding band is mounted on the press beam.
  • Figure 8 Shows a section of cloths that are joined by forcing two press beams and a power source with contact means.
  • Figure 9 shows an embodiment of a welding list.
  • the invention describes a welding system for welding thermoplastic parts together along a welding path.
  • welding line 1
  • welding line 1
  • a welding path is the path on the respective thermoplastic parts 2, 3 along which they are to be welded, or the line where the two parts are welded together.
  • the system comprises a thermoplastic welding list 11 , as shown in fig. 1 a-d, to be applied to the outside of one of the thermoplastic parts to be welded as shown in fig. 2a.
  • the welding list comprises a thermoplastic body 21 and at least one welding line 1 which is positioned inside or mounted on to the thermoplastic body 21.
  • the welding line 1 can also be sandwiched between two thermoplastic body parts 21a, 21b, which together constitutes the thermoplastic body.
  • the thermoplastic body 21 of the welding list 11 is extruded with the welding line 1 inside.
  • the welding list 11 further comprises an insulating layer 20 to prevent heat from escaping to the surrounding and to promote a more even heating.
  • the insulating layer 20 is a welding cloth or welding blanket made of fiberglass and a layer of aluminum foil.
  • the welding cloth is next to the thermoplastic body 20 of the welding list 11 , but the welding will also function if the aluminum layer is next to the thermoplastic body.
  • the welding line 1 comprises at least one flexible welding band 1 a or welding wire 1 b which can be heated by electrical resistance.
  • the welding band or welding wire can be made of many different types of metal, but it is a great advantage that the welding line 1 can bend and change direction when the thermoplastic to be welded is applied.
  • the welding system can be used on both thinner sheets or plates of thermoplastics, such as geomembranes, and on solid thermoplastic structures, such as boats, fish farms or tubular structures. However, it is a great advantage that the welding path is linear. Experience shows that the welding system can handle a thickness up to at least 5 cm of thermoplastic.
  • the metal in the welding line is copper.
  • a typical thickness of a copper welding band will be from 0.2 mm to 1 mm. Copper has been shown to work well in terms of price, electrical resistance, flexibility and sufficient resistance to mechanical influences.
  • the width of the welding band is in the order of 2-20 mm. If it becomes too wide, it will be difficult to make a curve with the welding band without curling it and thus cause uneven heating of the thermoplastic. As mentioned, the welding band or welding line does not form a strong bod with the thermoplastic for this reason the welding line should not be positioned centrally between the two parts to be welded thus weakening the bond between the parts to be welded.
  • thermoplastic welding methods In known thermoplastic welding methods, a heating tool is often used which heats a spot of the thermoplastic quickly and moves the heating tool along the welding path at a steady speed. This gives a strength in the weld of typically 60% of the unwelded material. The method according to the invention gives a strength of just over 80% of the unwelded material. The reason for this is that there is a slow and more homogeneous heating that takes place simultaneously over the entire welding path, while with spot welding there is a rapid heating that is difficult to get homogeneous. That is, welding with spot welding is to a greater extent dependent on a skilled and enduring craftsman / welder.
  • the welding system further comprises fastening means for making it possible to fasten the welding list to one of the thermoplastic parts to be welded.
  • the fastening means is an adhesive.
  • the system comprises pressure applicators 4.
  • the pressure applicators may be weights, clamps 4c, straps 4a or a specially developed pressing device 4b, preferably in combination with one or more press beams 7 to distribute the pressure along the welding path.
  • the mentioned pressing device 4b will be described later.
  • the pressure is calculated according to the standard for thermoplastic welding. Torque wrench may be used to control the pressure, when using a pressing device or clamps.
  • the pressing device 4b shown in fig. 2a and 2b comprises a pressing arm 16 with at least one suction cup 15 at each end and an adjustable pushing rod 14 in the middle.
  • the suction cups 15 are mounted on a suction cup arm 18, preferably with adjustable length to allow for different thicknesses of the parts to be welded and possibly a press beam 7.
  • the pushing rod 14 and suction cup arms are parallel. Both the suction cups 15 and the pushing rod 14 can be operable by hand, compressed air or hydraulics.
  • the pushing rod can also be electrically operated.
  • a number of pressing arms are mounted together on a longitudinal beam 17 as seen in fig 2b.
  • the pushing rod 14 may be adjusted by a screwing or jacking mechanism pressing against the area to be welded either directly on the structure or via a press beam 7 distributing the pressure along the welding path.
  • the longitudinal beam 17 and the press beam 7 can be the same beam or two different beams.
  • Fig. 3 shows a welding list below two thermoplastic parts to be welded 2, 3 and pressure is applied from above.
  • Fig. 4 shows a similar configuration with the welding list on top.
  • Fig. 4b shows the two parts from fig. 4 after welding.
  • the thermoplastic body 20 of the welding list has now to a large degree been pressed into the closet part to be welded and a welding line can be seen bulging out at the end of each part.
  • the overall thickness of the weld is slightly more than the two parts to be welded due to the thermoplastic body of the welding list.
  • the welding band 1a is now integrated into the welding path close to the top.
  • Fig. 5 and fig. 6 shows a configuration where a thermoplastic connection part 19 bridges the two thermoplastic parts to be welded. This configuration allows for a gap between the two parts 2, 3.
  • the welding line 1 preferably a welding band 1 a
  • the welding line 1 is fastened to at least one press beam 7 with a Teflon layer 8 attached to the outside of the welding band as seen in fig. 7.
  • the Teflon layer prevents the welding band from sticking to the thermoplastic after heating.
  • This embodiment has the advantage that the welding line 1 is attached to the press beam 7 and can be used again and again.
  • the pressure applicators 4 are preferably at least one of weights, straps 4a, the mentioned pressing device and clamps 4c. It can also be advantageous to use these in combination with press beams 7 in order to distribute the pressure along the welding path.
  • the welding system comprises an adjustable current source for heating the metal welding band to the desired temperature and contact means for creating an electrical circuit through the welding line 1 by means of the current source.
  • the contact means 6 will typically be two electrically conductive terminals which are attached to each end of the welding wire and to each wire which leads to its own pole on the adjustable power source.
  • the welding list 11 has a cross section which is the same in the longitudinal direction of the band and which is shaped as one of: T-shape, H- shape, trapeze, rectangle or triangle.
  • T-shape shaped as one of: T-shape, H- shape, trapeze, rectangle or triangle.
  • an Fl-shape can be used to join plates together.
  • the welding line 1 in the welding list 11 is a plurality of parallel wires or bands distributed over the cross section of the welding line.
  • two welding lines 1 are running parallel along the length of the welding list, as shown in figure 9, with electrical contact, achieved by means of a connector 13, at one end.
  • the figure also shows how welding lists can be connected together by means of male 12b and female 12a contacts.
  • the welding system is used by means of a method for welding thermoplastic along a welding path, the method comprising the following steps: a) Attaching a welding list 1 along the welding path to at least one of the thermoplastic parts to be welded. The insulating layer is directed away from the welding path. b) To apply pressure along the welding path by means of pressure applicators. The size of the pressure applied must be in accordance with 'Standards for thermoplastic welding'.
  • the pressure applicators may be weights, straps 4a, the described pressing device 4b or clamps 4c. If the structures to be welded are not sufficiently rigid, one or more pressure beams may be required which distribute the pressure along the welding path.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un système de soudage pour souder ensemble des pièces thermoplastiques le long d'un trajet de soudage. Le système comprend des applicateurs de pression destinés à presser les pièces thermoplastiques ensemble, une source d'énergie électrique réglable et des moyens de contact électrique destinés à créer un circuit électrique. Le système comprend en outre une liste de soudage thermoplastique à appliquer à un extérieur de l'une des pièces thermoplastiques. La liste de soudage thermoplastique comprend un corps thermoplastique, au moins une ligne de soudage cuite dans le corps thermoplastique ou montée sur celui-ci et une couche isolante fixée sur un côté pour être dirigée à l'opposé de la pièce thermoplastique à souder. Le système comprend en outre des moyens de fixation pour fixer la liste de soudage à l'une des parties thermoplastiques à souder. La pièce thermoplastique sur laquelle est appliquée la liste de soudage doit être suffisamment mince pour que la chaleur provenant de la ligne de soudage pénètre à travers ladite pièce thermoplastique
PCT/NO2021/050031 2020-01-31 2021-02-01 Système de soudage et procédé de soudage de thermoplastique WO2021154094A1 (fr)

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NO20220794A NO20220794A1 (en) 2020-01-31 2021-02-01 Welding system and method for welding thermoplastic

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NO20200117 2020-01-31
NO20200117A NO20200117A1 (fr) 2020-01-31 2020-01-31

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2630396A (en) * 1949-01-18 1953-03-03 Langer Nicholas Heat sealing method
US2983306A (en) * 1959-02-27 1961-05-09 Joseph Y Resnick Apparatus for continuously sealing thermoplastic materials
GB1121850A (en) * 1964-11-14 1968-07-31 Furukawa Electric Co Ltd A jointing method of pipe shaped plastics and the jointing materials
EP0498602A2 (fr) * 1991-02-06 1992-08-12 Nippon Zeon Co., Ltd. Procédé pour la fabrication d'un produit composite et mise en oeuvre de ce procédé
US5407514A (en) * 1988-02-03 1995-04-18 E. O. Butts Consultants Ltd. Method for welding thermoplastic materials
DE19705327A1 (de) * 1996-02-22 1997-11-27 Fischer Georg Rohrleitung Verfahren zum Verbinden von Kunststoffrohren
US6131954A (en) * 1996-05-28 2000-10-17 Campbell; Steve Weldable couple for electrofusion coupling of profile wall thermoplastic pipes without a separate coupler
WO2014182207A1 (fr) * 2013-05-08 2014-11-13 Tsc Innovation Ab Procédé et appareillage pour l'installation et la réparation d'un système de tuyaux
US20190366648A1 (en) * 2018-05-29 2019-12-05 Georg Fischer Rohrleitungssysteme Ag Electrofusion Tape

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2630396A (en) * 1949-01-18 1953-03-03 Langer Nicholas Heat sealing method
US2983306A (en) * 1959-02-27 1961-05-09 Joseph Y Resnick Apparatus for continuously sealing thermoplastic materials
GB1121850A (en) * 1964-11-14 1968-07-31 Furukawa Electric Co Ltd A jointing method of pipe shaped plastics and the jointing materials
US5407514A (en) * 1988-02-03 1995-04-18 E. O. Butts Consultants Ltd. Method for welding thermoplastic materials
EP0498602A2 (fr) * 1991-02-06 1992-08-12 Nippon Zeon Co., Ltd. Procédé pour la fabrication d'un produit composite et mise en oeuvre de ce procédé
DE19705327A1 (de) * 1996-02-22 1997-11-27 Fischer Georg Rohrleitung Verfahren zum Verbinden von Kunststoffrohren
US6131954A (en) * 1996-05-28 2000-10-17 Campbell; Steve Weldable couple for electrofusion coupling of profile wall thermoplastic pipes without a separate coupler
WO2014182207A1 (fr) * 2013-05-08 2014-11-13 Tsc Innovation Ab Procédé et appareillage pour l'installation et la réparation d'un système de tuyaux
US20190366648A1 (en) * 2018-05-29 2019-12-05 Georg Fischer Rohrleitungssysteme Ag Electrofusion Tape

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NO20200117A1 (fr) 2021-08-02
NO20220794A1 (en) 2022-07-12

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