GB2419844A - Interconnection element in bonding - Google Patents

Interconnection element in bonding Download PDF

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Publication number
GB2419844A
GB2419844A GB0522076A GB0522076A GB2419844A GB 2419844 A GB2419844 A GB 2419844A GB 0522076 A GB0522076 A GB 0522076A GB 0522076 A GB0522076 A GB 0522076A GB 2419844 A GB2419844 A GB 2419844A
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GB
United Kingdom
Prior art keywords
components
group
styrene
acrylonitrile
connection element
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Granted
Application number
GB0522076A
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GB2419844B (en
GB0522076D0 (en
Inventor
Bernt Kupper
Jorg Mattusch
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Volkswagen AG
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Volkswagen AG
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Publication of GB0522076D0 publication Critical patent/GB0522076D0/en
Publication of GB2419844A publication Critical patent/GB2419844A/en
Application granted granted Critical
Publication of GB2419844B publication Critical patent/GB2419844B/en
Expired - Fee Related legal-status Critical Current
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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"
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular 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
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B29C66/712—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined the composition of one of the parts to be joined being different from the composition of the other part
    • 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
    • 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
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2025/00—Use of polymers of vinyl-aromatic compounds or derivatives thereof as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/06—PVC, i.e. polyvinylchloride
    • 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
    • B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
    • B29K2033/04—Polymers of esters
    • B29K2033/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
    • 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
    • B29K2055/00—Use of specific polymers obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of main groups B29K2023/00 - B29K2049/00, e.g. having a vinyl group, as moulding material
    • B29K2055/02—ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers
    • 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
    • B29K2059/00—Use of polyacetals, e.g. POM, i.e. polyoxymethylene or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials
    • 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
    • B29K2623/00—Use of polyalkenes or derivatives thereof for preformed parts, e.g. for inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7172—Fuel tanks, jerry cans

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

Abstract

A connection insert of meltable thermoplastic material is used between synthetic materials of diverse chemical structure in order to bond them together. The insert may be melted by heat from a current carrying wire within the insert.

Description

1 2419844 Method of connecting and a composite of thermoplastic synthetic
material components The invention relates to a method of connecting synthetic material components and to a composite of meltable or thermoplastic synthetic material components, in particular consisting of chemically different materials or material groups which cannot be connected together e.g. by welding.
Synthetic materials are being used more and more in the production of the most wide- ranging products, such as e.g. housings, containers, pipes etc.. In many applications, it is thus necessary to connect individual components or assemblies firmly together.
Meltable or thermoplastic synthetic material components consisting of identical or in chemical terms substantially identical materials are connected primarily by welding methods such as resistive or inductive electro-fusing, buff-welding with heat reflectors, laser welding, ultrasonic welding or hot gas welding. The synthetic materials are welded by localised heating of the welding edges of the components to the welding temperature of the synthetic material and by pressurisation. During heating, the synthetic materials soften and blend together. In so doing, the welding method which is to be selected depends upon the synthetic material, the required strength of the connection, the workpiece shape and the installation costs.
When connecting synthetic material components by welding, in particular synthetic materials which cannot be connected together very easily by simple welding, the welding edges can be heated by means of a heating element which is provided in or on the welding edge of the components and which melts the welding edges. DE 199 16 494 Al discloses e.g. a method of producing a synthetic material component, in particular a fuel tank, in which disposed between two shell parts to be welded is a heating element which melts into the synthetic material as the shell parts are pressed together and thus produces a weld connection as the components are pressed together.
The heating element is preferably a heating wire which can be heated by electrical current, induction by heat conduction or by microwaves.
Furthermore, for the purpose of producing particularly sealed and stable connections, it is known to use so-called weld sleeves. In order to weld synthetic material components, in particular fuel pipes to a fuel tank, in accordance with WO 02/11973 Al a weld sleeve consisting of synthetic material is inserted in the annular gap between the insertion region of the tank and the insert pipe, said weld sleeve being provided with a heating element. The tank and the pipe consist of the same synthetic material, in particular polyethylene (PE). In order to produce a reliable weld connection by means of the sleeve, a sleeve consisting of the same synthetic material is used.
In GB 2 304 073 A, hollow bodies, such as e.g. pipes consisting of identical or different or in part also cross-linked synthetic materials, in particular different synthetic materials from the group of polyolefins, such as e.g. polyethylenes, polypropylenes, polybutylenes and copolymers of ethylenes, are welded by means of an electrically heatable connection element consisting of a cross-linked synthetic material from the group of polyolefins, in particular polyethylene, to a heating element which is embedded into the connection element.
In a method disclosed in EP 1129 316 B 1, a connection of components consisting of various synthetic materials from the group of polyolefins is likewise produced by means of connection element which can be heated. The connection element surrounds the components which are to be connected and contains alternating portions of the different materials, e.g. consisting of polyethylene (PE) and polypropylene (PP) of the components to be connected consisting of PE and PP. The embodiment of the connection element with the alternating portions is very complicated.
Although the methods disclosed in GB 2 304 073 A and EP 1129 316 B1 are suitable for connecting components consisting of different materials, the selection of materials is restricted to materials from the group of polyolefins. Equally, application is greatly restricted by the connection element which is very compact or must surround the components which are to be connected.
however, for many cases of application it is necessary both to connect other synthetic materials together and to have more flexible possibilities in the structural configuration of the connection. The adhesion methods which are known for this purpose often yield unsatisfactory or insufficiently stable connections and are very time- consuming.
Moreover, a further disadvantage of the said methods is that during recycling, adhesively bonded connections consisting of different materials cannot be separated from each other or can only be done so with great difficulty.
Therefore, it is the object of the invention to provide flexible ways of achieving a fixed and stable connection of components consisting of the most varied materials and to ensure recycling of connected components according to type and thus to
overcome the disadvantages of the prior art.
In accordance with a first aspect of the present invention there is a method of connecting components consisting of thermoplastic synthetic materials which method comprises at least the steps of: - providing the components which are to be connected and which comprise at least one synthetic material from the group of polyolefins, the group of styrene polymers, the group of polyacrylates, the group of polyvinyl chlorides, the group of polyamides, the group of cellulose esters, the group of polyacetals, the group of linear polyesters or the group of polycarbonates, - arranging a connection element consisting of a thermoplastic synthetic material, which can be connected by welding to the components to be connected, between and/or around the regions of the components which are to be connected, and - welding the connection element to the components which are to be connected.
In accordance with a second aspect of the present invention there is a composite of components consisting of synthetic materials which comprises at least the components to be connected comprising synthetic materials from the group of polyolefins, the group of styrene polymers, the group of polyacrylates, the group of polyvinyl chlorides, the group of polyamides, the group of cellulose esters, the group of polyacetals, the group of linear polyesters and/or the group of polycarbonates, and said composite comprises a connection element which consists of a synthetic material and is disposed between the components to be connected and is welded thereto.
The method in accordance with the invention renders it possible to connect together components consisting of identical and/or different thermoplastic synthetic materials which belong to the group of polyolefins (e.g. PE, PP, PB, PMP), the group of styrene polymers (e.g. PS, ABS, SB, SAN, ASA), the group of polyacrylates (e.g. PMMA, polyacrylamide), the group of polyvinyl chlorides (e.g. PVC-P, PVC-U), the group of polyamides (e.g. PA6.6, PAll, PA12), the group of cellulose esters (e.g. CA, CP, CAB), the group of polyacetals (e.g. POM), the group of linear polyesters (e.g. PET, PBT) and/or the group of polycarbonates. For this purpose, a connection element which consists of thermoplastic synthetic material and which can be connected by welding to each of the components which are to be connected is disposed between and/or around the regions of the components to be connected consisting of the same and/or different synthetic materials and is then welded thereto.
The welding procedure is performed by the application of heat to the connection element and the regions of the components which are to be connected, so that the components melt in each case with the connection element and after cooling a firm connection is produced between the components.
The thermoplastic synthetic materials are characterised by the fact that they melt during an increase in temperature after the softening point has been exceeded, they can be hot-formed and then solidify after cooling. The procedure can be repeated as often as required.
The inventive composite of components consisting of thermoplastic synthetic materials comprises at least the components which are to be connected consisting of the same andlor different thermoplastic synthetic materials from the group of polyolefins (e.g. PE, PP, PB, PMP), the group of styrene polymers (e.g. PS, ABS, SB, SAN, ASA), the group of polyacrylates (e.g. PMMA, polyacrylamide), the group of polyvinyl chlorides (e.g. PVC-P, PVC-U), the group of polyamides (e.g. PA6.6, PAll, PA 12), the group of cellulose esters (e.g. CA, CP, CAB), the group of polyacetals (e.g. POM), the group of linear polyesters (e.g. PET, PBT) and/or the group of polycarbonates, and a connection element which consists of a thermoplastic synthetic material and which is disposed between and/or around the components to be connected and is welded thereto.
The welding edges of the components, i.e. their regions which are to be connected and of the connection element are heated to a required welding temperature preferably by means of a heating element which is located in the connection element and/or on the connection element, in particular by means of an electrical heating wire.
A particularly simple and flexible connection is produced if the connection element is formed from a synthetic material sheet which prior to welding is disposed or inserted between the components to be connected. The sheet can be adapted to suit the most varied configurations and shapes of components which are to be connected, so that it is not only planar welding edges which can be connected together.
Connection elements consisting of ABS (acrylonitrile-butadiene-styrene), in particular deep-drawn ABS-sheets with an embedded heating wire have proven to be particularly suitable.
ABS is a terpolymer which is composed of the three basic monomers acrylonitrile, butadiene and styrene. 0
OH2- I 4CH2- UI UI The three monomers are arranged in statistical distribution in the linear macromolecule. ABS is produced by mass polymerisation of graft polymerisation.
Connection elements consisting of ABS are suitable for melting with a multiplicity of different thermoplastic synthetic materials and for producing a connection therebetween. In particular, components which comprise PS (polystyrene), SAN (styrene-acrylonitrile-copolymer), PMMA (polymethylmethacrylate), PVC (polyvinyl chloride), PC (polycarbonate), ABS (acrylonitrile-butadiene- styrene), PPE (modified polyether), PPE/PA (modified polyether/polyamide), PPE/PS (modified polyether/polystyrene), PPE/PS/SAN (modified polyether/polystyrene styreneacrylonitrile-copolymer), ABS/PC (acrylonitrile-butadienestyrene/polycarbonate) and/or ASA/PC (acrylonitrile-styrene-acryl ester/polycarbonate) can be joined together to form a composite by means of a connection element which comprises ABS. It is thus also possible to connect synthetic materials which cannot be welded together, such as e.g. PS to PMMA, SAN to PA, PVC to PC and many other combinations of materials.
Further suitable connection elements comprise SAN (styrene-acrylonitrilecopolymer) which can be welded effectively to PS (polystyrene), PMMA (polymethylmethacrylate), ABS (acrylonitrile-butadiene-styrene) and SAN (styrene- acrylonitrile-copolymer) and thus provides a durable composite between components which comprise these synthetic materials.
Also suitable are connection elements which comprise PMMA (polymethylmethacrylate) which can be welded effectively to PMMA (polymethylmethacrylate), PC (polycarbonate), ABS (acrylonitrilebutadiene-styrene) and PPE/PA (modified polyether/polyamide) and thus provides a durable composite between components which comprise these synthetic materials.
In order to recycle the connected components, the composite element can be reheated in particular by means of the electrical heating wire through the supply of current and the connected components consisting of different synthetic materials can be separated according to type along the melt zone which forms.
The invention will be explained in more detail hereinunder with reference to exemplified embodiments.
A display cover consisting of ABS/PC is to be connected to a display support consisting of PS. A sheet strip consisting of ABS and having an embedded heating wire is circumferentially inserted into the frame portion of the display support and the display cover is positioned on the display support, wherein the sheet strip lies between the regions of the display support and the display cover which are to be connected. Through the supply of current, the heating wire heats the sheet and the regions of the display support and the display cover which are to be connected to a temperature of ca. 260 C, at which the synthetic materials melt. The sheet consisting of ABS is welded to the display support consisting of PS and to the display cover consisting of ABS/PS, wherein after the synthetic materials cool, a firm connection is produced between the display support and the display cover.
In a similar manner to the aforementioned example, it is likewise possible to produce a connection between housings consisting of PMMA and PVC and synthetic material glazing consisting of PC for lamp housings.
A large number of other material combinations and composite components can also be achieved which by reason of their diversity cannot be listed in detail and exhaustively.

Claims (23)

/Y 4 Li c. CLAIMS
1. Method of connecting components consisting of thermoplastic synthetic materials which method comprises at least the steps of: - providing the components which are to be connected and which comprise at least one synthetic material from the group of polyolefins, the group of styrene polymers, the group of polyacrylates, the group of polyvinyl chlorides, the group of polyamides, the group of cellulose esters, the group of polyacetals, the group of linear polyesters or the group of polycarbonates, - arranging a connection element consisting of a thermoplastic synthetic material, which can be connected by welding to the components to be connected, between and/or around the regions of the components which are to be connected, and - welding the connection element to the components which are to be connected.
2. Method as claimed in claim 1, characterised in that components consisting of the same synthetic materials are provided.
3. Method as claimed in claim 1, characterised in that components consisting of different synthetic materials are provided.
4. Method as claimed in any one of the preceding claims, characterised in that the connection element and the regions of the components which are to be connected together are heated to a welding temperature by means of a heating element which is located in the connection element andlor on the connection element, wherein said connection element is welded to the components which are to be connected.
5. Method as claimed in any one of the preceding claims, characterised in that a connection element consisting of a synthetic material sheet is disposed between the components which are to be connected.
6. Method as claimed in any one of the preceding claims, characterised in that a connection element which comprises ABS (acrylonitrile-butadienestyrene) is disposed between the components which are to be connected.
7. Method as claimed in claim 6, characterised in that components which are to be connected and which comprise PS (polystyrene), SAN (styrene-acrylonitrile- copolymer), PMMA (polymethylmethacrylate), PVC (polyvinyl chloride), PC (polycarbonate), ABS (acrylonitrile-butadiene-styrene), PPE (modified polyether), PPE/PA (modified polyether/polyamide), PPE/PS (modified polyether/polystyrene), PPE/PS/SAN (modified polyether/polystyrene/styrene-acrylonitrile-copolymer), ABS/PC (acrylonitrile-butadiene-styrene/polycarbonate) and/or ASAIPC (acrylonitrile-styrene-acryl ester/polycarbonate) are provided.
8. Method as claimed in any one of claims 1 to 5, characterised in that a connection element which comprises SAN (styrene-acrylonitrile-copolymer) is disposed between the components which are to be connected.
9. Method as claimed in claim 8, characterised in that components which are to be connected and which comprise PS (polystyrene), PMMA (polymethylmethacrylate), ABS (acrylonitrile-butadiene-styrene) andlor SAN (styrene-acrylonitrile-copolymer) are provided.
10. Method as claimed in any one of claims 1 to 5, characterised in that a connection element which comprises PMMA (polyrnethylmethacrylate) is disposed between the components which are to be connected.
11. Method as claimed in claim 10, characterised in that components which are to be connected and which comprise PMMA (polymethylmethacrylate), PC (polycarbonate), ABS (acrylonitrile-butadiene-styrene) and PPE/PA (modified polyether/polyamide) are provided.
12. Composite of components consisting of synthetic materials which comprises at least the components to be connected comprising synthetic materials from the group of polyolefins, the group of styrene polymers, the group of polyacrylates, the group of polyvinyl chlorides, the group of polyamides, the group of cellulose esters, the group of polyacetals, the group of linear polyesters and/or the group of polycarbonates, and said composite comprises a connection element which consists of a synthetic material and is disposed between the components to be connected and is welded thereto.
13. Composite as claimed in claim 12, characterised in that the components which are to be connected comprise the same synthetic materials.
14. Composite as claimed in claim 12, characterised in that the components which are to be connected comprise different synthetic materials.
15. Composite as claimed in any one of claims 12 to 14, characterised in that a heating element is located in and/or on the connection element.
16. Composite as claimed in claim 15, characterised in that the heating element is an electrically conductive wire.
17. Composite as claimed in any one of claims 12 to 16, characterised in that the connection element comprises a synthetic material sheet.
18. Composite as claimed in any one of claims 12 to 17, characterised in that the connection element comprises a synthetic material consisting of ABS (acrylonitrile- butadiene-styrene).
19. Composite as claimed in claim 18, characterised in that the components which are to be connected together comprise at least one synthetic material consisting of PS (polystyrene), SAN (styrene-acrylonitrile-copolymer), PMMA (polymethylmethacrylate), PVC (polyvinyl chloride), PC (polycarbonate), ABS (acrylonitrile-butadiene-styrene), PPE (modified polyether), PPE/PA (modified polyether/polyamide), PPE/PS (modified polyether/polystyrene), PPE/PS/SAN (modified polyether/polystyrene/styrene-acrylonitrile-copolymer), ABS/PC (acrylonitrile-butadiene-styrene/polycarbonate) and/or ASA/PC (acrylonitrile- styrene-acryl ester/polycarbonate).
20. Composite as claimed in any one of claims 12 to 17, characterised in that the connection element comprises a synthetic material consisting of SAN (styrene- acrylonitrile-copolymer).
21. Composite as claimed in claim 20, characterised in that the components which are to be connected comprise at least one synthetic material consisting of PS (polystyrene), PMMA (polymethylmethacrylate), ABS (acrylonitrile- butadiene- styrene) and/or SAN (styrene-acrylonitrile-copolymer).
22. Composite as claimed in any one of claims 12 to 17, characterised in that the connection element comprises a synthetic material consisting of PMMA (polymethylmethacrylate).
23. Composite as claimed in claim 22, characterised in that the components which are to be connected comprise at least one synthetic material consisting of PMMA (polymethylmethacrylate), PC (polycarbonate), ABS (acrylonitrile- butadiene-styrene) andlor PPE/PA (modified polyether/polyamide).
GB0522076A 2004-11-05 2005-10-31 Method of connecting and a composite of thermoplastic synthetic material components Expired - Fee Related GB2419844B (en)

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