WO2013030114A1 - Device for thermal impulse welding - Google Patents

Device for thermal impulse welding Download PDF

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Publication number
WO2013030114A1
WO2013030114A1 PCT/EP2012/066513 EP2012066513W WO2013030114A1 WO 2013030114 A1 WO2013030114 A1 WO 2013030114A1 EP 2012066513 W EP2012066513 W EP 2012066513W WO 2013030114 A1 WO2013030114 A1 WO 2013030114A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
components
carrier
heating
medium
Prior art date
Application number
PCT/EP2012/066513
Other languages
German (de)
French (fr)
Inventor
Tobias BEIß
Original Assignee
Bielomatik Leuze Gmbh + Co. Kg
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 Bielomatik Leuze Gmbh + Co. Kg filed Critical Bielomatik Leuze Gmbh + Co. Kg
Publication of WO2013030114A1 publication Critical patent/WO2013030114A1/en

Links

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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/224—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip being a resistive ribbon, a resistive band or a resistive 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
    • B29C65/38—Impulse heating
    • 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
    • B29C66/80—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
    • B29C66/8145—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81455—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps being a fluid inflatable bag or bladder, a diaphragm or a vacuum bag for applying isostatic pressure
    • 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
    • B29C66/8145—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81459—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps being a filled deformable bladder, e.g. bladder filled with oil, with granules or with a meltable solid material
    • 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
    • B29C66/818—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8182—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects
    • B29C66/81821—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects of the welding jaws
    • 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
    • B29C66/818—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8187—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects
    • B29C66/81871—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects of the welding jaws
    • 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
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and 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
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined
    • B29C66/0044—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined using a separating sheet, e.g. fixed on the joining tool
    • 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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • 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
    • B29C66/8145—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81457—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a block or layer of deformable material, e.g. sponge, foam, rubber
    • 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
    • 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
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining 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
    • 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
    • B29C66/9241—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 pressure, the force or the mechanical power

Definitions

  • the invention relates to a device for heat pulse welding of two components to be assembled from plastic, wherein a support is provided, on which rest the components and wherein further at least one of the joining region of the components associated heating element is provided, which acts on the joining area for joining the components with heat, according to the features of the preamble of claim 1.
  • Such devices and corresponding methods for heat pulse welding are known in principle.
  • two components for example, two plastic films brought together and applied to the joining area by means of at least one Schueiementes such heat that melt the two mutually associated joining regions of the components and solidify after removal of the heat input so that they are permanently connected to each other.
  • the heat input through the at least one heating element is selected so that the joining is achieved without the joining region burning away, melting away or the like.
  • 1 denotes a device for heat pulse welding, in which two components 2 made of plastic (here foils) are joined together. These components 2 rest on a support 3 and are acted upon by a heating tape 4 in its joining region with heat.
  • Non-stick coating is an insulating film 5 (for example, a PTFE film) glued over the mounted heating tape 4.
  • insulating film 5 for example, a PTFE film
  • electrical insulation is still a film in the form of electrical insulation 6 available.
  • the device 1 shown in Figure 2 and the associated method works quite well for flat component contours, such as foils.
  • even the smallest unevenness in the heating tape influences the characteristics of the joining region, ie the weld seam. There are irregularities or air bubbles because of the uneven contact pressure.
  • three-dimensional contours of the components due to the different expansion behavior of heating tape and adhesive tape with which the heating tape is mounted, for example, from a suitable steel alloy on a supporting structure, in particular the carrier 3, with the aid of double-sided adhesive tape, and the adhesive tape a detachment of the heating tape coming from the carrier. Since the heat of the heating tape can not be homogeneously dissipated into the carrier as in the adjacent areas, it comes at such places to overheating (also called hot spot).
  • the heating band temperature is measured integrally, for example, via the electrical resistance.
  • the resistance is based on the temperature of the material, in particular the Steel, the heating tape. If this is higher locally, the resistance also drops locally and the result of the integral measurement (analogous to a series connection of individual resistors) is falsified.
  • the process temperature is then adversely considered to be too low and further increased by temperature control means. This can disadvantageously lead to overheating, in the worst case to a melting away or burning off of the components in the joint area.
  • the Hetzband in an equivalent circuit can be regarded as a series circuit of resistors.
  • the resistors R1 to R3 and R5 to R7 are present. If the normal pressure 8 in the joining region of the components 2 were applied over the entire course of the heating tape, the average resistance (here R4, medium assumed only as an example) would be the same as the other resistors which are located to the right and left thereof. However, since a mispredict 9 prevails in this area, the resistance R4 is significantly greater or smaller than the excess resistances so that the sum of the individual resistances is falsified by the axial extent of the heating band.
  • the invention is therefore based on the object to avoid the disadvantages described above and in particular to provide a device with which after assembly of the components, a homogeneous joining region over its entire course is ensured.
  • This object is achieved by the features of claim 1.
  • the carrier is associated, at least in the joining region of the components, with a flexible pressure element which can be acted upon by an internal pressure.
  • the pressure element is therefore suitable and adapted to receive a medium (compressible or incompressible), to hold a predeterminable pressure for this medium and thus due to its flexibility (elasticity, flexibility, which can be adjusted by the Materiai inches for the pressure element) local pressure differences to balance the joining area.
  • the pressure element is designed as a tube filled with the medium.
  • a hose has the advantage that an elongated joining region can thus be realized in order to be able to connect appropriately designed components to one another.
  • the course of the hose advantageously follows the course of the heating element, so that it is possible, for example, to realize welds in an elongated and narrow shape.
  • the tube can be round or rectangular in its cross-section or, for example, correspond to a D-profile.
  • the D-profile is particularly advantageous if with the rounded portion of this profile of the hose is fixed in or on the carrier and the flat portion of the hose facing the joint area of the components facing each other.
  • the pressure element is designed as a space filled with the medium and covered with a membrane space in the carrier.
  • the pressure element is formed by the carrier and the membrane as a cover.
  • the pressure element and the carrier are separate components from each other.
  • the pressure element is at least one flat pad filled with a medium.
  • This cushion is available once or several times to and / or in the carrier and filled with the pressure-compensating medium. If two or more cushions are present, the media contained therein may be self-contained or even interconnected for pressure equalization purposes.
  • the cushion (s) are supported by the carrier, in particular in the region of their support surface or their side regions.
  • further supports for example in the form of partitions within the carrier, are present. But several pillows can also be arranged directly to each other in the carrier and support each other.
  • a part of the pillow or the cushion, in particular its one surface, is free in the direction of the joining region and can come to this before the plant for the purpose of pressure equalization before, during or after the energy input.
  • At least a flat pressure pad has advantages at tight curve radii, where the bending radius of a hose reaches its limits.
  • the pressure element is arranged completely on or completely in the carrier.
  • the pressure element at least partially projects beyond the carrier in the direction of the joining region.
  • the pressure-compensating medium is a water, an oil or a gas.
  • means are provided with which the pressure of the pressure-compensating medium in the pressure element can be regulated.
  • the pressurization of the joining region can be selected by the pressure element in dependence of the components to be assembled together, so that differently shaped, for example, different thickness components can be joined together, in which the internal pressure is controlled in the pressure element.
  • the temperature of the pressure-compensating medium in the pressure element can be regulated.
  • the water or generally the medium can be tempered in order to optimize the heat dissipation and / or the heat balance of the system, in particular of the pressure element.
  • the heating element is designed as a heating tape.
  • a heating tape With such an elongate and narrow heating element formed elongated and narrow welds can be realized in an advantageous manner. This realization is of particular advantage when the heating element is designed as a heating tape and the pressure element as a hose.
  • the heating element in particular the heating tape
  • an adhesive in particular an adhesive tape, a high-temperature adhesive or equivalent adhesives
  • the heating element in particular the heating tape
  • the heating element is provided in the direction of the joining region with a film and / or with a coating.
  • a film and / or with a coating are selected from such a material advantageously, which has non-stick properties with respect to the material of the components to be assembled.
  • FIG. 1A which generally shows a known device 1 for heat pulse welding
  • a support 20 is provided in FIG. 1A, wherein a heating element, here a heating tape 21, is present, which is provided by means of an adhesive, preferably an adhesive tape or an adhesive layer 22 , on a pressure element, here a flexible hose 23, arranged and fixed.
  • the flexible hose 23 in turn is filled with a medium 25, in particular a water, an oil or a gas.
  • a medium 25 in particular a water, an oil or a gas.
  • the embodiment of the device 1 for heat pulse welding according to Figure 1A is such that the pressure element, here the flexible tube 23, is arranged so completely in the carrier that only an upper zenith region of the flexible tube 23 protrudes from the carrier 20, so it is possible to arrange there the heating tape 21 on the tape 22 and secure.
  • FIG. 1C shows the same configuration as the preceding FIGS. 1A and 1B, but with the difference that the pressure element, again here the flexible tube 23, is at least partially (preferably approximately half) within the carrier 20 and with the another part, preferably with the other half, projects beyond the carrier 20.
  • the pressure element again here the flexible tube 23
  • FIG. 1D shows an exemplary embodiment in which the pressure element is designed as a space filled with the medium 25 and covered with a membrane 24 in the carrier 20.
  • the heating tape (generally the heating element) is applied to the membrane 24 via the adhesive tape 22. This also advantageously equalizes the pressure over the entire extent of the joining region of the two components to be joined, which are not shown in FIG. 1 for the sake of simplicity. Also not shown in the individual figures of Figure 1 that means may be present to control the temperature and / or pressure of the medium 25.
  • an apparatus and a method for heat pulse welding is provided in which the joining region of the two components to be assembled over its entire extension, which may have any shape is homogeneous, without defects are present. If, however, defects are to be present, these are negligible as a result of the pressure element according to the invention.
  • This heating element in particular the heating tape, can be produced in various designs without this being a limitation.
  • a special metal alloy for heat metal impulse welding It will then with a double-sided tape mounted on the carrier (carrier profile, support structure or the like). It can also be produced in the form of a layer functionally filled with electrically conductive carbon nanotubes. It can also consist of a metal or a carbon fiber fabric. It is then also mounted on the carrier profile with a suitable assembly aid (eg double-sided adhesive tape or adhesive). It can also consist of an electrically conductive, ceramic thick-layer coating (thick-film resistor). Such thick-film conductors as heating are known for example from DE 43 33 852 A1.
  • FIG. 5 shows that the pressure element is a flat cushion filled with a medium 25.
  • This cushion is simple or (as shown in Figure 5) two or more times and / or present in the carrier 20 and filled with the pressure-compensating medium 25. If two or more cushions are present, the media contained therein may be self-contained or even interconnected for pressure equalization purposes.
  • the cushion or pads are supported by the carrier 20, in particular in the region of its support surface or its side regions.
  • further supports for example in the form of partitions 27 within the carrier 20, are present. But several pillows can also be arranged directly to each other in the carrier 20 and support each other.
  • a part of the pillow or the cushion, in particular its one surface, is free in the direction of the joining region and can come to this before the plant for the purpose of pressure equalization before, during or after the energy input.
  • the areas which are not accessible to the joining area can be covered by a cover provided in the same plane as the joining area, in particular a one-part or multi-part cover plate 26, for the purpose of stabilization.
  • the cover extends in an advantageous manner to near or very close to the joining area, without it interfering with the joining process and the elements involved.
  • the cover is provided to avoid the appearance or bulging of the pad during pressure equalization.
  • the cushion can be mounted, for example, via studs to the carrier 20 and fixed in its position to this.
  • One way of contouring to avoid centering of the pad is through inner webs, a masking mask with recesses, or the insertion of studs (corresponding to apertures in the pad) that hold the covered contour to the supporting substructure.

Abstract

The invention relates to a device (1) for the thermal impulse welding of two plastic components (2) to be joined, a carrier (20) being provided, on which the components (2) lie, and furthermore at least one heating element associated with the joining region of the components (2) being provided, which heating element applies heat to the joining region in order to join the components (2), characterized in that a flexible pressure element which can be internally pressurized is associated with the carrier (20) at least in the joining region of the components (2).

Description

Vorrichtung zum Wärmeimpulsschweißen  Apparatus for heat pulse welding
Beschreibung description
Die Erfindung betrifft eine Vorrichtung zum Wärmeimpulsschweißen von zwei zusammenzufügenden Bauteilen aus Kunststoff, wobei ein Träger vorgesehen ist, auf dem die Bauteile aufliegen und wobei weiterhin zumindest ein dem Fügebereich der Bauteile zugeordnetes Heizelement vorgesehen ist, welches den Fügebereich zum Zusammenfügen der Bauteile mit Wärme beaufschlagt, gemäß den Merkmalen des Oberbegriffes des Patentanspruches 1. The invention relates to a device for heat pulse welding of two components to be assembled from plastic, wherein a support is provided, on which rest the components and wherein further at least one of the joining region of the components associated heating element is provided, which acts on the joining area for joining the components with heat, according to the features of the preamble of claim 1.
Solche Vorrichtungen und entsprechende Verfahren zum Wärmeimpulsschweißen sind grundsätzlich bekannt. Dabei werden zwei Bauteile, zum Beispiel zwei Kunststofffolien, zusammengebracht und der Fügebereich mittels zumindest eines Heizeiementes derart mit Wärme beaufschlagt, dass die beiden einander zugeordneten Fügebereiche der Bauteile aufschmelzen und nach Wegnahme des Wärmeeintrages erstarren, sodass sie unlösbar miteinander verbunden sind. Der Wärmeeintrag durch das zumindest eine Heizelement ist dabei so gewählt, dass das Zusammenfügen erzielt wird, ohne dass der Fügebereich wegbrennt, wegschmilzt oder dergleichen. Such devices and corresponding methods for heat pulse welding are known in principle. In this case, two components, for example, two plastic films brought together and applied to the joining area by means of at least one Heizeiementes such heat that melt the two mutually associated joining regions of the components and solidify after removal of the heat input so that they are permanently connected to each other. The heat input through the at least one heating element is selected so that the joining is achieved without the joining region burning away, melting away or the like.
Der bekannte Stand der Technik ist zum Beispiel in den Figuren 2 bis 4 erläutert. The known prior art is explained for example in Figures 2 to 4.
In den beiden Darstellungen der Figur 2 ist mit 1 eine Vorrichtung zum Wärmeimpulsschweißen bezeichnet, bei der zwei Bauteile 2 aus Kunststoff (hier Folien) zusammengefügt werden. Diese Bauteile 2 liegen auf einem Träger 3 auf und werden von einem Heizband 4 in ihrem Fügebereich mit Wärme beaufschlagt. Als Antihaft-Beschichtung ist eine Isolierfolie 5 (zum Beispiel eine PTFE-Folie) über das montierte Heizband 4 geklebt. Zwecks elektrischer Isolierung ist noch eine Folie in Form einer elektrischen Isolierung 6 vorhanden. In the two representations of Figure 2, 1 denotes a device for heat pulse welding, in which two components 2 made of plastic (here foils) are joined together. These components 2 rest on a support 3 and are acted upon by a heating tape 4 in its joining region with heat. When Non-stick coating is an insulating film 5 (for example, a PTFE film) glued over the mounted heating tape 4. For the purpose of electrical insulation is still a film in the form of electrical insulation 6 available.
Bei der Vorrichtung 1 in der linken Darstellung der Figur 2 sind zwei Heizbänder 4 vorhanden, zwischen denen die beiden Bauteile 2 angeordnet sind. Bei der rechten Darstellung der Figur 2 ist lediglich ein Heizband 4 vorhanden, wobei unterhalb des Heizbandes 4 und unterhalb des zugeordneten Fügebereiches der beiden Bauteile 2 eine elastische Basis 7 vorhanden ist. In the device 1 in the left-hand illustration of FIG. 2, two heating bands 4 are present, between which the two components 2 are arranged. In the right-hand illustration of FIG. 2, only one heating band 4 is present, an elastic base 7 being present below the heating band 4 and below the associated joining region of the two components 2.
Die Vorrichtung 1 , die in Figur 2 dargestellt ist, und das zugehörige Verfahren, funktioniert bei flachen Bauteilkonturen, wie zum Beispiel bei Folien, recht gut. Bei dünnen Folien beeinflussen allerdings schon kleinste Unebenheiten im Heizband die Ausprägung des Fügebereiches, also der Schweißnaht. Es entstehen Unregelmäßigkeiten oder Luftblasen wegen des ungleichmäßigen Anpressdruckes. Bei dreidimensionalen Konturen der Bauteile (beispielsweise Höhensprünge) kann es aufgrund des unterschiedlichen Ausdehnungsverhaltens von Heizband und Klebeband, mit dem das Heizband zum Beispiel aus einer geeigneten Stahllegierung auf eine Tragstruktur, insbesondere den Träger 3, mithilfe von doppelseitigem Klebeband montiert ist, und dem Klebeband zu einem Ablösen des Heizbandes von dem Träger kommen. Da die Wärme des Heizbandes nicht mehr wie in den benachbarten Bereichen homogen in den Träger abgeführt werden kann, kommt es an solchen Stellen zu einer Überhitzung (auch Hot-Spot genannt). The device 1 shown in Figure 2 and the associated method, works quite well for flat component contours, such as foils. In the case of thin films, however, even the smallest unevenness in the heating tape influences the characteristics of the joining region, ie the weld seam. There are irregularities or air bubbles because of the uneven contact pressure. In the case of three-dimensional contours of the components (for example height jumps), due to the different expansion behavior of heating tape and adhesive tape with which the heating tape is mounted, for example, from a suitable steel alloy on a supporting structure, in particular the carrier 3, with the aid of double-sided adhesive tape, and the adhesive tape a detachment of the heating tape coming from the carrier. Since the heat of the heating tape can not be homogeneously dissipated into the carrier as in the adjacent areas, it comes at such places to overheating (also called hot spot).
Die Folgen sind: The consequences are:
- Fehler in der Temperaturmessung. Die Heizbandtemperatur wird beispielsweise über den elektrischen Widerstand integral gemessen. Der Widerstand basiert auf der Temperatur des Materials, insbesondere des Stahles, des Heizbandes. Ist dieser lokal höher, sinkt der Widerstand auch lokal ab und das Ergebnis der integralen Messung (analog zu einer Reihenschaltung von Einzelwiderständen) wird verfälscht. Die Prozesstemperatur wird dann in nachteiliger Weise als zu niedrig angenommen und von Mitteln zur Temperaturregelung weiter erhöht. Dadurch kann es in nachteiliger Weise zu der Überhitzung, im schlimmsten Fall zu einem Wegschmelzen oder Abbrennen der Bauteile im Fügebereich, kommen. - Error in the temperature measurement. The heating band temperature is measured integrally, for example, via the electrical resistance. The resistance is based on the temperature of the material, in particular the Steel, the heating tape. If this is higher locally, the resistance also drops locally and the result of the integral measurement (analogous to a series connection of individual resistors) is falsified. The process temperature is then adversely considered to be too low and further increased by temperature control means. This can disadvantageously lead to overheating, in the worst case to a melting away or burning off of the components in the joint area.
- Durch die lokal erhöhten Temperaturen und die mangelnde Wärmeabfuhr kann es ebenfalls in einer nachteiligen Weise zu einer Schädigung der Isolierung, insbesondere der PTFE-Abdeckung oder des doppelseitigen Montageklebebandes kommen. Nach dieser Schädigung ist die Prozesssicherheit für nachfolgende Schweißungen nicht mehr gewährleistet. - Due to the locally elevated temperatures and the lack of heat dissipation, it can also come in a disadvantageous manner to damage the insulation, in particular the PTFE cover or the double-sided assembly adhesive tape. After this damage, the process reliability for subsequent welding is no longer guaranteed.
In Figur 3 ist als Stand der Technik dargestellt, dass das Hetzband in einer Ersatzschaltung als eine Reihenschaltung von Widerständen angesehen werden kann. An einzelnen Stellen, an denen ein Normaldruck 8 herrscht, liegen die Widerstände R1 bis R3 sowie R5 bis R7 vor. Würde über den gesamten Verlauf des Heizbandes der Normaldruck 8 im Fügebereich der Bauteile 2 anliegen, wäre auch der mittlere Widerstand (hier R4, mittel nur als Beispiel angenommen) genauso groß wie die übrigen Widerstände, die sich rechts und links davon befinden. Da aber in diesem Bereich ein Fehldruck 9 herrscht, ist der Widerstand R4 deutlich größer bzw. kleiner Qe nach Druck) als die übngen Widerstände, sodass die Summe der Einzelwiderstände über die axiale Ausdehnung des Heizbandes verfälscht wird. Dadurch kommt es im Bereich des Fehldruckes zu einer Überhitzung 10, weil ein Temperaturregler 1 1 in Folge des Fehldruckes 9 die Prozesstemperatur als zu niedrig annimmt und sie so lange weiter erhöht, bis es im Bereich des Fehldruckes 9 zu einer Überhitzung kommt. Analoges gilt für die Situation, die in Figur 4 dargestellt ist. In einem Fügebereich 2 liegen in Folge eines Höhensprunges die beiden Bauteile 2, die zusammengefügt werden sollen, flächig aufeinander, sodass das Wärmeimpulsschweißen homogen und ohne Fehlstellen durchgeführt werden kann. Beispielsweise davor und/oder dahinter bildet sich ein Spalt 13, der zu einem Fehlfügebereich 14 führt. Da auch hier ein Fehldruck, insbesondere kein Anlagedruck der beiden Bauteile 2 zueinander, vorliegt, kommt es zu der schon geschilderten Überhitzung, sodass dadurch die Fügestelle nicht homogen wird. Diese Nicht-Homogenität bedeutet, dass die beiden Bauteile 2 in diesem Bereich entweder gar nicht oder nicht ausreichend miteinander verbunden werden. Es kann aber auch dazu führen, dass die beiden Bauteile aufgrund ihrer Überhitzung wegbrennen oder wegschmelzen, sodass auch dadurch keine Verbindung, wie sie eigentlich gewollt ist, zustande kommt. In FIG. 3, it is shown as state of the art that the Hetzband in an equivalent circuit can be regarded as a series circuit of resistors. At individual points where there is a normal pressure 8, the resistors R1 to R3 and R5 to R7 are present. If the normal pressure 8 in the joining region of the components 2 were applied over the entire course of the heating tape, the average resistance (here R4, medium assumed only as an example) would be the same as the other resistors which are located to the right and left thereof. However, since a mispredict 9 prevails in this area, the resistance R4 is significantly greater or smaller than the excess resistances so that the sum of the individual resistances is falsified by the axial extent of the heating band. As a result, overheating 10 occurs in the region of the mispressure because a temperature controller 1 1 assumes the process temperature as too low as a result of the misprint 9 and continues to increase it until it overheats in the region of the misprint 9. The same applies to the situation shown in FIG. In a joining region 2, as a result of a vertical jump, the two components 2, which are to be joined together, lie flat against one another, so that the heat pulse welding can be carried out homogeneously and without defects. For example, in front of and / or behind a gap 13 is formed, which leads to a Fehlfügeereich 14. Since there is also a misprint, in particular no contact pressure of the two components 2 to each other, there is the already described overheating, so that thereby the joint is not homogeneous. This non-homogeneity means that the two components 2 in this area either not at all or not sufficiently connected to each other. But it can also cause the two components burn away or melt away due to their overheating, so that even no connection, as it is actually intended, comes about.
Das heißt zusammenfassend, dass falsches Design der Bauteile, mangelnde Ausgleichsfähigkeit der beteiligten Werkzeugelemente und dergleichen zu Lücken zwischen den beiden zusammenzufügenden Bauteilen führt und es damit zu einer inhomogenen Wärmeabgabe durch das Heizelement an die Fügebereiche der beteiligten Bauteile kommt. Dadurch wird in nachteiliger Weise das Zusammenfügen der beiden Bauteile verhindert oder die Strukturfestigkeit des Fügebereiches ist mangelhaft, sodass im späteren Betrieb der beiden Bauteile Nachteile auftreten können, wenn diese entweder nicht richtig miteinander verbunden sind oder sich im Betrieb voneinander lösen. In summary, this means that incorrect design of the components, lack of compensating capability of the tool elements involved and the like leads to gaps between the two components to be assembled and thus results in an inhomogeneous heat emission by the heating element to the joining regions of the components involved. As a result, the joining of the two components is disadvantageously prevented or the structural strength of the joining region is poor, so that disadvantages may occur in the subsequent operation of the two components, if these are either not properly connected to each other or detach from each other during operation.
Der Erfindung liegt daher die Aufgabe zugrunde, die eingangs geschilderten Nachteile zu vermeiden und insbesondere eine Vorrichtung bereitzustellen, mit der nach dem Zusammenfügen der Bauteile ein homogener Fügebereich über seinen gesamten Verlauf sichergestellt ist. Diese Aufgabe ist die Merkmale des Patentanspruches 1 gelöst. Erfindungsgemäß ist vorgesehen, dass dem Träger zumindest in dem Fügebereich der Bauteile ein mit einem einem Innendruck beaufschlagbares flexibles Druckelement zugeordnet ist. Dadurch wird in vorteilhafter Weise ein Heizsystemaufbau erzielt, der Unebenheiten sowohl der gesamten Vorrichtung zum Wärmeimpuisschweißen als auch der beteiligten Bauteile durch einen automatischen Druckausgleich über die Erstreckung des Fügebereiches kompensiert. Ebenso werden in vorteilhafter Weise lokale Fehlsteilen im Fügebereich infolge von zu hohen oder zu niedrigen Anpressdrücken, die gemäß dem Stand der Technik lokal auftreten können, kompensiert, sodass nach dem Zusammenfügen der Bauteile in ihrem Fügebereich dieser weitestgehend homogen ist. Es kann daher nicht mehr zu einzelnen lokalen Fehldrücken kommen, wie es weiter oben zu Figur 3 beschrieben worden ist. Das Druckelement ist also dazu geeignet und ausgebildet, ein Medium (kompressibel oder inkompressibel) aufzunehmen, für dieses Medium einen vorgebbaren Druck zu halten und damit aufgrund seiner Nachgiebigkeit (Elastizität, Flexibilität, die durch die Materiaiwahl für das Druckelement eingestellt werden kann) lokale Druckunterschiede auf den Fügebereich auszugleichen. The invention is therefore based on the object to avoid the disadvantages described above and in particular to provide a device with which after assembly of the components, a homogeneous joining region over its entire course is ensured. This object is achieved by the features of claim 1. According to the invention, it is provided that the carrier is associated, at least in the joining region of the components, with a flexible pressure element which can be acted upon by an internal pressure. As a result, a Heizsystemaufbau is achieved in an advantageous manner, compensates for the unevenness of both the entire device for heat pulse welding and the components involved by an automatic pressure compensation over the extension of the joint area. Likewise, local defects in the joint area due to too high or too low contact pressures, which may occur locally according to the prior art, are compensated in an advantageous manner, so that after joining the components in their joint area this is largely homogeneous. It can therefore no longer come to individual local errors, as has been described above to Figure 3. The pressure element is therefore suitable and adapted to receive a medium (compressible or incompressible), to hold a predeterminable pressure for this medium and thus due to its flexibility (elasticity, flexibility, which can be adjusted by the Materiaiwahl for the pressure element) local pressure differences to balance the joining area.
In Weiterbildung der Erfindung ist das Druckelement als ein mit dem Medium gefüllter Schlauch ausgebildet. Ein solcher Schlauch hat den Vorteil, dass damit ein länglich verlaufender Fügebereich realisiert werden kann, um entsprechend gestaltete Bauteile miteinander verbinden zu können. Dabei folgt der Verlauf des Schlauches in vorteilhafter Weise dem Verlauf des Heizelementes, sodass sich dadurch beispielsweise Schweißnähte in länglicher und schmaler Form realisieren lassen. Der Schlauch kann in seinem Querschnitt rund oder rechteckig sein oder beispielsweise einem D-Profil entsprechen. Dies ist jedoch nur beispielhaft, denn es kommen wesentlich mehr Profile (Querschnitte) in Frage, wenn man entsprechende Extrusionsformen für die Herstellung des Schlauches hat. Das D-Profil ist insbesondere dann von Vorteil, wenn mit dem abgerundeten Bereich dieses Profils der Schlauch in oder an dem Träger befestigt ist und der plane Bereich des Schlauches dem Fügebereich der Bauteile einander zugewandt ist. In a further development of the invention, the pressure element is designed as a tube filled with the medium. Such a hose has the advantage that an elongated joining region can thus be realized in order to be able to connect appropriately designed components to one another. In this case, the course of the hose advantageously follows the course of the heating element, so that it is possible, for example, to realize welds in an elongated and narrow shape. The tube can be round or rectangular in its cross-section or, for example, correspond to a D-profile. However, this is only an example, because there are significantly more profiles (cross sections) in question, if appropriate Extrusion molding for the production of the hose has. The D-profile is particularly advantageous if with the rounded portion of this profile of the hose is fixed in or on the carrier and the flat portion of the hose facing the joint area of the components facing each other.
Alternativ dazu ist es in vorteilhafter Weise und in Weiterbildung der Erfindung denkbar, dass das Druckelement als ein mit dem Medium gefüllter und mit einer Membran abgedeckter Raum in dem Träger ausgebildet ist. In diesem Fall wird das Druckelement von dem Träger und der Membran als Abdeckung gebildet. In dem vorher beschriebenen Fall des Schlauches sind Druckelement und Träger voneinander separate Bauteile. Alternatively, it is conceivable in an advantageous manner and in a development of the invention that the pressure element is designed as a space filled with the medium and covered with a membrane space in the carrier. In this case, the pressure element is formed by the carrier and the membrane as a cover. In the previously described case of the hose, the pressure element and the carrier are separate components from each other.
Alternativ dazu ist es in vorteilhafter Weise und in Weiterbildung der Erfindung denkbar, dass das Druckelement zumindest ein flächiges mit einem Medium gefülltes Kissen ist. Dieses Kissen ist einfach oder mehrfach an und/oder in dem Träger vorhanden und mit dem druckausgleichenden Medium gefüllt. Sind zwei oder mehr Kissen vorhanden, können die darin befindlichen Medien in sich abgeschlossen sein oder auch untereinander zwecks Druckausgleichs verbunden sein. Das oder die Kissen werden durch den Träger, insbesondere im Bereich ihrer Auflagefläche bzw. ihren Seitenbereichen, gestützt. Darüber hinaus ist es denkbar, dass weitere Stützen, zum Beispiel in Form von Trennwänden innerhalb des Trägers, vorhanden sind. Mehrere Kissen können aber auch direkt zueinander in dem Träger angeordnet sein und sich gegenseitig stützen. Wichtig ist, dass ein Teil des Kissens oder der Kissen, insbesondere deren eine Oberfläche, in Richtung des Fügebereiches frei ist und an diesem zur Anlage zwecks Druckausgleichs vor, während bzw. nach dem Energieeintrag kommen kann. Zumindest ein flächiges Druckkissen hat bei engen Kurvenradien Vorteile, wo der Biegeradius eines Schlauchs an seine Grenzen stößt. Damit stehen verschiedene Möglichkeiten zur Realisierung des Druckelementes zur Verfügung, wodurch eine sehr gute Anpassbarkeit an die Geometrien, insbesondere die Konturen, des Fügebereiches der beteiligten Bauteile möglich ist. Alternatively, it is conceivable in an advantageous manner and in a further development of the invention that the pressure element is at least one flat pad filled with a medium. This cushion is available once or several times to and / or in the carrier and filled with the pressure-compensating medium. If two or more cushions are present, the media contained therein may be self-contained or even interconnected for pressure equalization purposes. The cushion (s) are supported by the carrier, in particular in the region of their support surface or their side regions. In addition, it is conceivable that further supports, for example in the form of partitions within the carrier, are present. But several pillows can also be arranged directly to each other in the carrier and support each other. It is important that a part of the pillow or the cushion, in particular its one surface, is free in the direction of the joining region and can come to this before the plant for the purpose of pressure equalization before, during or after the energy input. At least a flat pressure pad has advantages at tight curve radii, where the bending radius of a hose reaches its limits. Thus, various possibilities for the realization of the printing element are available, whereby a very good adaptability to the geometries, in particular the contours of the joining region of the components involved is possible.
In Weiterbildung der Erfindung ist das Druckelement vollständig auf oder vollständig in dem Träger angeordnet. Daneben ist es denkbar, dass das Druckelement zumindest teilweise über dem Träger in Richtung des Fügebereiches übersteht. Dadurch sind verschiedene Ausgestaltungen des Trägers und des Druckelementes möglich, sodass auch hier wieder eine sehr gute Anpassbarkeit des Heizsystemes an die Kontur des Fügebereiches bei gleichzeitig vorteilhaftem Druckausgleich zur Vermeidung von Fehldruckstellen gegeben ist. In a further development of the invention, the pressure element is arranged completely on or completely in the carrier. In addition, it is conceivable that the pressure element at least partially projects beyond the carrier in the direction of the joining region. As a result, various embodiments of the carrier and the pressure element are possible, so that here again a very good adaptability of the heating system is given to the contour of the joint area with simultaneous advantageous pressure equalization to avoid misalignment points.
In Weiterbildung der Erfindung ist das druckausgleichende Medium ein Wasser, ein Öl oder ein Gas. Diese kompressibien oder auch inkompressiblen Medien haben den Vorteil, dass sie sich innerhalb des Druckelementes homogen verteilen, gleichzeitig aber auch lokale Fehldruckstellen, insbesondere auch im Zusammenspiel mit dem Material des Druckelementes, ausgleichen. In a further development of the invention, the pressure-compensating medium is a water, an oil or a gas. These compressible or incompressible media have the advantage that they are distributed homogeneously within the printing element, but at the same time compensate for local misalignment points, in particular in interaction with the material of the printing element.
In Weiterbildung der Erfindung sind Mittel vorgesehen, mit denen der Druck des druckausgleichenden Mediums in dem Druckelement regelbar ist. Dadurch kann die Druckbeaufschlagung des Fügebereiches durch das Druckelement in Abhängigkeit der beteiligten zusammenzufügenden Bauteile gewählt werden, sodass auch unterschiedlich gestaltete, beispielsweise unterschiedlich dicke Bauteile miteinander zusammengefügt werden können, in dem der Innendruck in dem Druckelement geregelt wird. Alternativ kann es ausreichend sein, das Druckelement einmal mit einem Medium zu füllen und anschließend zu verschließen, um für nachfolgende Schweißvorgänge immer den gleichen Druck auf die Fügebereiche ausüben zu lassen. In einem solchen Falle ist jedoch zu Zwecken der Prozesssicherheit daran zu denken, nach Ausführung einer bestimmten Anzahl von Schweißvorgängen den Innendruck zu überprüfen. Alternativ oder in Ergänzung zu der Druckregelung ist es in Weiterbildung der Erfindung vorgesehen, dass Mittel vorgesehen sind, mit denen die Temperatur des druckausgleichenden Mediums in dem Druckelement regelbar ist. Das heißt, dass beispielsweise das Wasser oder allgemein das Medium temperiert werden kann, um die Wärmeabfuhr und/oder den Wärmehaushalt des Systems, insbesondere des Druckelementes, zu optimieren. In a further development of the invention, means are provided with which the pressure of the pressure-compensating medium in the pressure element can be regulated. Thereby, the pressurization of the joining region can be selected by the pressure element in dependence of the components to be assembled together, so that differently shaped, for example, different thickness components can be joined together, in which the internal pressure is controlled in the pressure element. Alternatively, it may be sufficient to fill the pressure element once with a medium and then to close in order to always exert the same pressure on the joining areas for subsequent welding operations. In such a case, however, for purposes of process safety, it is to be considered to check the internal pressure after performing a certain number of welding operations. Alternatively or in addition to the pressure control, it is provided in a development of the invention that means are provided with which the temperature of the pressure-compensating medium in the pressure element can be regulated. This means that, for example, the water or generally the medium can be tempered in order to optimize the heat dissipation and / or the heat balance of the system, in particular of the pressure element.
In Weiterbildung der Erfindung ist das Heizelement als Heizband ausgebildet. Mit einem solchen länglichen und schmalen ausgebildeten Heizelement können in vorteilhafter Weise längliche und schmale Schweißnähte realisiert werden. Diese Realisierung ist dann von besonderem Vorteil, wenn das Heizelement als Heizband und das Druckelement als Schlauch ausgebildet sind. In a further development of the invention, the heating element is designed as a heating tape. With such an elongate and narrow heating element formed elongated and narrow welds can be realized in an advantageous manner. This realization is of particular advantage when the heating element is designed as a heating tape and the pressure element as a hose.
In Weiterbildung der Erfindung ist das Heizelement, insbesondere das Heizband, mit einem Kleber, insbesondere einem Klebeband, einem Hochtemperaturklebstoff oder gleichwirkenden Klebstoffen, auf dem Druckelement befestigt. Dadurch lässt sich ein besonders vorteilhafter einfacher Aufbau der gesamten Vorrichtung erzielen. In a further development of the invention, the heating element, in particular the heating tape, with an adhesive, in particular an adhesive tape, a high-temperature adhesive or equivalent adhesives, mounted on the printing element. As a result, a particularly advantageous simple construction of the entire device can be achieved.
In Weiterbildung der Erfindung ist das Heizelement, insbesondere das Heizband, in Richtung des Fügebereiches mit einer Folie und/oder mit einer Beschichtung versehen. Damit wird wirksam vermieden, dass der Fügebereich des zugeordneten Bauteiles an dem Heizelement, insbesondere an dem Heizband, anhaftet. Zu diesem Zweck sind in vorteilhafter Weise die Folie und/oder die Beschichtung aus einem solchen Material gewählt, welches in Bezug auf das Material der zusammenzufügenden Bauteile Antihaft-Eigenschaften aufweist. In a development of the invention, the heating element, in particular the heating tape, is provided in the direction of the joining region with a film and / or with a coating. This effectively prevents the joining region of the associated component from adhering to the heating element, in particular to the heating tape. For this purpose, the film and / or the coating are selected from such a material advantageously, which has non-stick properties with respect to the material of the components to be assembled.
Ein Ausführungsbeispiel der Erfindung ist in verschiedenen Varianten in Figur 1 dargestellt. Bezug nehmend auf die Figur 2, die allgemein eine bekannte Vorrichtung 1 zum Wärmeimpulsschweißen zeigt, ist in Figur 1A ein Träger 20 vorgesehen, wobei ein Heizelement, hier ein Heizband 21 , vorhanden ist, welches mittels eines Klebers, vorzugsweise eines Klebebandes oder einer Klebstoffschicht 22, auf einem Druckelement, hier ein flexibler Schlauch 23, angeordnet und festgelegt ist. Der flexible Schlauch 23 seinerseits ist mit einem Medium 25 gefüllt, insbesondere ein Wasser, ein Öl oder ein Gas. Nicht dargestellt sind Mittel, mit denen der Innendruck des Mediums 25 in dem flexiblen Schlauch 23 und/oder die Temperatur des Mediums 25 eingestellt, insbesondere geregelt werden kann. Die Ausgestaltung der Vorrichtung 1 zum Wärmeimpulsschweißen gemäß Figur 1A ist derart, dass das Druckelement, hier der flexible Schlauch 23, so vollständig in dem Träger angeordnet ist, dass nur noch ein oberer Zenit-Bereich des flexiblen Schlauches 23 aus dem Träger 20 herausragt, sodass es möglich ist, dort das Heizband 21 über das Klebeband 22 anzuordnen und zu befestigen. An embodiment of the invention is shown in different variants in Figure 1. With reference to FIG. 2, which generally shows a known device 1 for heat pulse welding, a support 20 is provided in FIG. 1A, wherein a heating element, here a heating tape 21, is present, which is provided by means of an adhesive, preferably an adhesive tape or an adhesive layer 22 , on a pressure element, here a flexible hose 23, arranged and fixed. The flexible hose 23 in turn is filled with a medium 25, in particular a water, an oil or a gas. Not shown are means by which the internal pressure of the medium 25 in the flexible tube 23 and / or the temperature of the medium 25 can be adjusted, in particular regulated. The embodiment of the device 1 for heat pulse welding according to Figure 1A is such that the pressure element, here the flexible tube 23, is arranged so completely in the carrier that only an upper zenith region of the flexible tube 23 protrudes from the carrier 20, so it is possible to arrange there the heating tape 21 on the tape 22 and secure.
Alternativ dazu ist die gleiche Ausgestaltung in Figur 1 B gezeigt, jedoch mit dem Unterschied, dass das Druckelement, hier wieder der flexible Schlauch 23, vollständig auf dem Träger 20 angeordnet ist. Alternatively, the same embodiment in Figure 1 B is shown, but with the difference that the pressure element, here again the flexible tube 23, is arranged completely on the carrier 20.
Ebenfalls analog dazu zeigt die Figur 1 C die gleiche Ausgestaltung wie die vorangegangenen Figuren 1A und 1B, jedoch mit dem Unterschied, dass das Druckelement, auch hier wieder der flexible Schlauch 23, zumindest teilweise (vorzugsweise etwa hälftig) innerhalb des Trägers 20 und mit dem anderen Teil, vorzugsweise mit der anderen Hälfte, über den Träger 20 hinausragt. Likewise in the same way, FIG. 1C shows the same configuration as the preceding FIGS. 1A and 1B, but with the difference that the pressure element, again here the flexible tube 23, is at least partially (preferably approximately half) within the carrier 20 and with the another part, preferably with the other half, projects beyond the carrier 20.
Im Unterschied zu den vorangegangen Figuren 1A bis 1C zeigt die Figur 1D ein Ausführungsbeispiel, bei dem das Druckelement als ein mit dem Medium 25 gefüllter und mit einer Membran 24 abgedeckter Raum in dem Träger 20 ausgebildet ist. Bei dieser Ausgestaltung ist das Heizband (allgemein das Heizelement) über das Klebeband 22 auf der Membran 24 aufgebracht. Auch dadurch wird in vorteilhafter Weise ein Druckausgleich über die gesamte Erstreckung des Fügebereiches der beiden zusammenzufügenden Bauteile, die in der Figur 1 der Einfachheit haiber nicht dargestellt sind, erzielt. Ebenfalls ist in den einzelnen Figuren der Figur 1 nicht dargestellt, dass Mittel vorhanden sein können, um die Temperatur und/oder den Druck des Mediums 25 zu regeln. In contrast to the preceding FIGS. 1A to 1C, FIG. 1D shows an exemplary embodiment in which the pressure element is designed as a space filled with the medium 25 and covered with a membrane 24 in the carrier 20. at In this embodiment, the heating tape (generally the heating element) is applied to the membrane 24 via the adhesive tape 22. This also advantageously equalizes the pressure over the entire extent of the joining region of the two components to be joined, which are not shown in FIG. 1 for the sake of simplicity. Also not shown in the individual figures of Figure 1 that means may be present to control the temperature and / or pressure of the medium 25.
In vorteilhafter Weise wird also eine Vorrichtung und ein Verfahren zum Wärmeimpulsschweißen zur Verfügung gestellt, bei dem der Fügebereich der beiden zusammenzufügenden Bauteile über seine gesamte Erstreckung, die beliebige Form aufweisen kann, homogen ist, ohne dass Fehlstellen vorhanden sind. Sollen trotzdem Fehlstellen vorhanden sein, sind diese infolge des erfindungsgemäßen Druckelementes vernachlässigbar. Advantageously, therefore, an apparatus and a method for heat pulse welding is provided in which the joining region of the two components to be assembled over its entire extension, which may have any shape is homogeneous, without defects are present. If, however, defects are to be present, these are negligible as a result of the pressure element according to the invention.
Die Vorrichtung 1 , wie sie in Figur 2 dargestellt ist, kann also durch die Heiz- und Druckausgleichsysteme, wie sie in den Figuren 1A bis 1 D gezeigt sind, verbessert werden. Dabei ist es denkbar, dass die Heiz- und Druckausgleichssysteme, wie sie in den Figuren 1A bis 1 D dargestellt sind, entweder nur einseitig im Fügebereich der beiden zusammenzufügenden Bauteile und einem entsprechenden Gegenhalter vorhanden sind oder aber jeweils zweimal, d.h. also beidseitig des Fügebereiches, vorhanden sind. The device 1, as shown in Figure 2, so can be improved by the heating and pressure equalization systems, as shown in Figures 1A to 1 D. It is conceivable that the heating and pressure compensation systems, as shown in Figures 1A to 1 D, either only one side in the joining region of the two components to be assembled and a corresponding counter-holder are present or in each case twice, i. So on both sides of the joint area, are available.
Bezüglich des Heizelementes, insbesondere des Heizbandes, ist noch Folgendes auszuführen: Dieses Heizelement, insbesondere das Heizband, kann in verschiedenen Ausführungen hergestellt werden, ohne dass dies eine Einschränkung bedeutet. Zum einen aus einer speziellen Metalllegierung für das Wärmemetallimpulsschweißen. Es wird dann mit einem doppelseitigen Klebeband auf den Träger (Trägerprofil, Trägerstruktur oder dergleichen) montiert. Es kann auch in Form einer mit elektrisch leitfähigen Carbon-Nanotubes funktionell gefüllten Schicht hergestellt werden. Es kann auch aus einem Metall oder einem Kohlenstofffasergewebe bestehen. Es wird dann mit einem geeigneten Montagehilfsmittel (z.B. doppelseitiges Klebeband oder Klebstoff) ebenfalls auf das Trägerprofil montiert. Es kann auch aus einer elektrisch leitfähigen, keramischen Dickschichtbeschichtung (Dickschichtwiderstand) bestehen. Solche Dickschichtleiterbahnen als Heizung sind zum Beispiel aus der DE 43 33 852 A1 bekannt. With regard to the heating element, in particular of the heating tape, the following is still to be stated: This heating element, in particular the heating tape, can be produced in various designs without this being a limitation. On the one hand from a special metal alloy for heat metal impulse welding. It will then with a double-sided tape mounted on the carrier (carrier profile, support structure or the like). It can also be produced in the form of a layer functionally filled with electrically conductive carbon nanotubes. It can also consist of a metal or a carbon fiber fabric. It is then also mounted on the carrier profile with a suitable assembly aid (eg double-sided adhesive tape or adhesive). It can also consist of an electrically conductive, ceramic thick-layer coating (thick-film resistor). Such thick-film conductors as heating are known for example from DE 43 33 852 A1.
In Figur 5 schließlich ist noch gezeigt, dass das Druckelement ein flächiges mit einem Medium 25 gefülltes Kissen ist. Dieses Kissen ist einfach oder (wie in Figur 5 gezeigt) zwei- oder mehrfach an und/oder in dem Träger 20 vorhanden und mit dem druckausgleichenden Medium 25 gefüllt. Sind zwei oder mehr Kissen vorhanden, können die darin befindlichen Medien in sich abgeschlossen sein oder auch untereinander zwecks Druckausgleichs verbunden sein. Das oder die Kissen werden durch den Träger 20, insbesondere im Bereich ihrer Auflagefläche bzw. ihren Seitenbereichen, gestützt. Darüber hinaus ist es denkbar, dass weitere Stützen, zum Beispiel in Form von Trennwänden 27 innerhalb des Trägers 20, vorhanden sind. Mehrere Kissen können aber auch direkt zueinander in dem Träger 20 angeordnet sein und sich gegenseitig stützen. Wichtig ist, dass ein Teil des Kissens oder der Kissen, insbesondere deren eine Oberfläche, in Richtung des Fügebereiches frei ist und an diesem zur Anlage zwecks Druckausgleichs vor, während bzw. nach dem Energieeintrag kommen kann. Die nicht für den Fügebereich zugänglichen Bereiche können durch eine in der gleichen Ebene wie der Fügebereich vorgesehene Abdeckung, insbesondere ein ein- oder mehrteiliges Abdeckblech 26, zwecks Stabilisierung abgedeckt sein. Dabei reicht die Abdeckung in vorteilhafter Weise bis nahe oder sehr nahe an den Fügebereich heran, ohne dass es den Fügevorgang und die beteiligten Elemente dabei stört. Die Abdeckung ist zur Vermeidung von Auftauchen oder Aufbauchen des Kissens während des Druckausgleiches vorgesehen. Das Kissen kann zum Beispiel über Stehbolzen zum Träger 20 hin montiert und in seiner Lage zu diesem festgelegt werden. Finally, FIG. 5 shows that the pressure element is a flat cushion filled with a medium 25. This cushion is simple or (as shown in Figure 5) two or more times and / or present in the carrier 20 and filled with the pressure-compensating medium 25. If two or more cushions are present, the media contained therein may be self-contained or even interconnected for pressure equalization purposes. The cushion or pads are supported by the carrier 20, in particular in the region of its support surface or its side regions. In addition, it is conceivable that further supports, for example in the form of partitions 27 within the carrier 20, are present. But several pillows can also be arranged directly to each other in the carrier 20 and support each other. It is important that a part of the pillow or the cushion, in particular its one surface, is free in the direction of the joining region and can come to this before the plant for the purpose of pressure equalization before, during or after the energy input. The areas which are not accessible to the joining area can be covered by a cover provided in the same plane as the joining area, in particular a one-part or multi-part cover plate 26, for the purpose of stabilization. In this case, the cover extends in an advantageous manner to near or very close to the joining area, without it interfering with the joining process and the elements involved. The cover is provided to avoid the appearance or bulging of the pad during pressure equalization. The cushion can be mounted, for example, via studs to the carrier 20 and fixed in its position to this.
Eine Möglichkeit zur Konturgebung, damit ein Aufbauchen des Kissens in der Mitte vermieden wird, sind Innenstege, eine abdeckende Blechmaske mit Aussparungen oder das Einbringen von Stehbolzen (entsprechend Durchbrüchen im Kissen), welche die abgedeckte Kontur am tragenden Unterbau halten. One way of contouring to avoid centering of the pad is through inner webs, a masking mask with recesses, or the insertion of studs (corresponding to apertures in the pad) that hold the covered contour to the supporting substructure.
Bezugszeichenliste: LIST OF REFERENCE NUMBERS
1. Vorrichtung zum Wärmeimpulsschweißen1. Apparatus for heat pulse welding
2. Bauteile 2. Components
3. Träger  3. carrier
4. Heizband  4. Heating tape
5. Isolierfolie  5. insulating film
6. Elektrische Isolierung  6. Electrical insulation
7. Elastische Basis  7. Elastic base
8. Normaldruck  8. Normal pressure
9. Fehldruck  9. Misprint
10. Überhitzung  10. Overheating
11. Temperaturregler  11. Temperature controller
12. Fügebereich  12. Joining area
13. Spalt  13th split
14. Fehlfügebereich  14. Misapplication area
20 Träger  20 carriers
21 Heizband  21 heating tape
22 Kleber  22 glue
23 flexibler Schlauch  23 flexible hose
24 Membran  24 membrane
25 Medium  25 medium
26 Abdeckblech  26 cover plate
27 Trennwand  27 partition

Claims

Vorrichtung zum Wärmeimpulsschweißen Patentansprüche Apparatus for heat pulse welding Claims
1 . Vorrichtung (1) zum Wärmeimpuisschweißen von zwei zusammenzufügenden Bauteilen (2) aus Kunststoff, wobei ein Träger (20) vorgesehen ist, auf dem die Bauteile (2) aufliegen, und wobei weiterhin zumindest ein den Fügebereich der Bauteile (2) zugeordnetes Heizelement vorgesehen ist, welches den Fügebereich zum Zusammenfügen der Bauteile (2) mit Wärme beaufschlagt, dadurch gekennzeichnet, dass dem Träger (20) zumindest in dem Fügebereich der Bauteile (2) ein mit einem Innendruck beaufschlagbares flexibles Druckelement zugeordnet ist. 1 . Device (1) for heat impact welding of two components (2) made of plastic, wherein a carrier (20) is provided, on which the components (2) rest, and further wherein at least one of the joining region of the components (2) associated heating element is provided , which acts on the joining area for joining the components (2) with heat, characterized in that the carrier (20) at least in the joining region of the components (2) is associated with a pressurizable with an internal pressure flexible pressure element.
2. Vorrichtung (1 ) nach Anspruch 1 , dadurch gekennzeichnet, dass das Druckelement als ein mit dem Medium (25) gefüllter Schlauch (23) ausgebildet ist. 2. Device (1) according to claim 1, characterized in that the pressure element as a with the medium (25) filled tube (23) is formed.
3. Vorrichtung (1 ) nach Anspruch 1 , dadurch gekennzeichnet, dass das3. Device (1) according to claim 1, characterized in that the
Druckelement als ein mit dem Medium (25) gefüllter und mit einer Membran (24) abgedeckter Raum in dem Träger (20) ausgebildet ist. Pressure element as a filled with the medium (25) and with a membrane (24) covered space in the carrier (20) is formed.
4. Vorrichtung (1 ) nach Anspruch 1 , dadurch gekennzeichnet, dass das Druckelement zumindest ein flächiges mit einem Medium gefülltes Kissen ist. 4. Device (1) according to claim 1, characterized in that the pressure element is at least one area filled with a medium cushion.
5. Vorrichtung (1 ) nach Anspruch 1 , 2, 3 oder 4, dadurch gekennzeichnet, dass das Druckelement vollständig auf oder in dem Träger (20) angeordnet ist oder zumindest teilweise über dem Träger (20) in Richtung des Fügebereiches übersteht. 5. Device (1) according to claim 1, 2, 3 or 4, characterized in that the pressure element is arranged completely on or in the carrier (20) or at least partially projects beyond the carrier (20) in the direction of the joining region.
6. Vorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das druckausgleichende Medium (25) ein Wasser, ein Öl oder ein Gas ist. 6. Device (1) according to one of the preceding claims, characterized in that the pressure-compensating medium (25) is a water, an oil or a gas.
7. Vorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass Mittel vorgesehen sind, mit denen der Druck des druckausgleichenden Mediums (25) in dem Druckelement regelbar ist. 7. Device (1) according to any one of the preceding claims, characterized in that means are provided, with which the pressure of the pressure-compensating medium (25) in the pressure element can be regulated.
8. Vorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass Mittel vorgesehen sind, mit denen die Temperatur des druckausgleichenden Mediums (25) in dem Druckelement regelbar ist. 8. Device (1) according to one of the preceding claims, characterized in that means are provided, with which the temperature of the pressure-compensating medium (25) in the pressure element can be regulated.
9. Vorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Heizelement als Heizband (21) ausgebildet ist. 9. Device (1) according to one of the preceding claims, characterized in that the heating element is designed as a heating tape (21).
10. Vorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Heizelement, insbesondere das Heizband (21), mit einem Kleber, insbesondere einem Klebeband (22) oder einer hochtemperaturfesten Kiebeschicht, auf dem Druckelement befestigt ist. 10. Device (1) according to one of the preceding claims, characterized in that the heating element, in particular the heating tape (21), with an adhesive, in particular an adhesive tape (22) or a high-temperature resistant Kiebeschicht, is mounted on the printing element.
11. Vorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Heizelement, insbesondere das Heizband (21), schwimmend auf dem Druckelement gelagert ist. 11. Device (1) according to one of the preceding claims, characterized in that the heating element, in particular the heating tape (21), is floatingly mounted on the pressure element.
12. Vorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Heizelement, insbesondere das Heizband (21), in Richtung des Fügebereiches mit einer Folie und/oder mit einer Beschichtung versehen ist. 12. Device (1) according to any one of the preceding claims, characterized in that the heating element, in particular the heating tape (21) is provided in the direction of the joining region with a film and / or with a coating.
PCT/EP2012/066513 2011-08-30 2012-08-24 Device for thermal impulse welding WO2013030114A1 (en)

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