GB2286148A - Securing thermosetting elastomeric and thermoplastics components together - Google Patents

Securing thermosetting elastomeric and thermoplastics components together Download PDF

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Publication number
GB2286148A
GB2286148A GB9501770A GB9501770A GB2286148A GB 2286148 A GB2286148 A GB 2286148A GB 9501770 A GB9501770 A GB 9501770A GB 9501770 A GB9501770 A GB 9501770A GB 2286148 A GB2286148 A GB 2286148A
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GB
United Kingdom
Prior art keywords
component
thermoplastics
elastomeric
components
elastomeric component
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB9501770A
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GB2286148B (en
GB9501770D0 (en
Inventor
James Richard Hirst
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Glynwed Plastics Ltd
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Glynwed Plastics Ltd
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Publication date
Priority claimed from GB9401931A external-priority patent/GB9401931D0/en
Application filed by Glynwed Plastics Ltd filed Critical Glynwed Plastics Ltd
Priority to GB9501770A priority Critical patent/GB2286148B/en
Publication of GB9501770D0 publication Critical patent/GB9501770D0/en
Publication of GB2286148A publication Critical patent/GB2286148A/en
Application granted granted Critical
Publication of GB2286148B publication Critical patent/GB2286148B/en
Anticipated expiration legal-status Critical
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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
    • 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
    • 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
    • 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
    • B29C66/50—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
    • B29C66/55—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 sealing elements being incorporated into the joints, e.g. gaskets
    • 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
    • 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
    • B29C66/7394—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 thermoset
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/12—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives
    • C08J5/121—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives by 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
    • 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
    • B29C65/06—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using friction, e.g. spin welding
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C66/737—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 state of the material of the parts to be joined
    • B29C66/7375—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 state of the material of the parts to be joined uncured, partially cured or fully cured
    • B29C66/73755—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 state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being fully cured, i.e. fully cross-linked, fully vulcanized
    • 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
    • B29K2019/00—Use of rubber not provided for in a single one of main groups B29K2007/00 - B29K2011/00, 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
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/16—EPM, i.e. ethylene-propylene copolymers; EPDM, i.e. ethylene-propylene-diene copolymers; EPT, i.e. ethylene-propylene terpolymers
    • 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
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/10—Thermosetting resins
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

A thermosetting elastomeric component 1 and a thermoplastics component 3, such as a seal and a carrier eg. for use in making a sealed pipe joint, are separately formed, assembled as required and then secured together, before use, by application of heat to the thermoplastics component to melt and bond a surface portion of that component to an adjacent surface portion of the other component. Preferably ultrasonic heating is used. The bond 15 may be continuous or discontinuous. In one embodiment the elastomeric material is a vulcanisable epdm based rubber elastomer and the thermoplastics material is a polyolefin. In another embodiment the elastomeric material is a nitrile based rubber elastomer with a pvc content of less then 5%; the material of the thermoplastics component is pvc. <IMAGE>

Description

Securing Elastomeric and Thermoplastics Components Together This invention relates to securing elastomeric and thermoplastics components together and particularly, but not exclusively, to securing an elastomeric seal to a thermoplastics carrier.
Elastomeric seals are used in a wide variety of sealing and gasket applications and are typically produced in vulcanised synthetic or natural rubber, the composition of the elastomer being chosen according to the intended use and desired characteristic of the seal. One common use of such seals is in joints between ends of adjoining pipes in which an elastomeric seal has a circumferential sealing lip which acts upon the outside circumference of one pipe, and the seal is clamped in sealing relationship to a connector by an end cap, which is similarly connected to the next pipe. The seal and end cap have conventionally been supplied as separate components which the assembler fits together when forming a pipe connection. Assembly of the seal in that end cap takes time and it is not always easy to ensure that the seal is properly located in the end cap and presented to the connector and pipes at the joint to obtain a satisfactorily sealed connection between the pipes and the connector.
Automated assembly of the seals and end caps has been a problem due particularly to the seals twisting or deforming when stored and, in that state, being difficult to feed into automated assembly equipment.
There is a need for the making of pipe joints as described, and in other applications, to provide an end cap, housing or other carrier to which a seal has previously been secured in order to facilitate the fitting of the seal and carrier for use. One known method of doing this in respect of an elastomeric seal and a thermoplastics end cap is to bond the seal to the end cap by inserting the pre-made seal into a mould and injection moulding the end cap around it. This requires special tooling and accurate insertion of the flexible pre-made seal into, and retention in, a mould which adds to the cost and complexity of manufacture.
It is also known to weld a thermoplastic rubber sealing ring in a vinyl chloride based resin pipework connector. A problem with this arrangement is that the ring may not provide an adequate seal because of the tendency for its thermoplastic material to take a permanent set once it has been deformed.
It is an aim of the present invention to provide an improved assembly of secured elastomeric and thermoplastics components.
According to a first aspect of the present invention, there is provided a method of securing a thermosetting elastomeric component to a thermoplastics component in which the pre-formed components are assembled together in a desired relationship and heat is applied to the thermoplastics component to cause a surface portion of that component to melt and become bonded to an adjacent surface portion of the elastomeric component.
It is desirable that the materials of the components will readily bond together when the surface portion of the thermoplastics component is melted and that the thermosetting elastomeric component material has a significantly higher melting point than that of the thermoplastics component so that it will not melt under the heat applied to the thermoplastics components.
Preferably the thermosetting elastomeric material is vulcanisable. The component may be vulcanised prior to bonding it to the thermoplastics component. In one embodiment of the invention the thermosetting elastomeric component is made of a vulcanisable ethylene propylene diene monomer (epdm) based rubber elastomer and the thermoplastics component is made of a polyolefin thermoplastics material. The thermosetting elastomeric component of that embodiment is vulcanised before it is bonded to the thermoplastics component. In another embodiment the thermosetting elastomeric component is made of a vulcanisable nitrile based rubber elastomer and the thermoplastics component is made of polyvinyl chloride (pvc). The nitrile based rubber elastomer, whilst remaining thermosetting, may contain pvc to assist in bonding the components together. Typically the pvc content is less than 5%.
The heat may be applied to the thermoplastics component by conduction and/or radiation. It may be applied directly, for example by applying a heating or heated tool, or it may be induced, for example by relative frictional movement between the two components. In a preferred method the heat is applied by ultrasonic heating means.
The heat may be applied through the thermosetting elastomeric component, when the two components have been assembled together in the desired relationship, to melt the surface portion of the thermoplastics component. In this case, the elastomeric component is preferably pre-vulcanised and the temperature at which it burns is well above the temperature at which the thermoplastics material melts. A portion of the elastomeric component may have a reduced thickness to facilitate heat transfer through that portion to the surface portion of the thermoplastics component.
The bond between the components may be continuous or discontinuous. When the components are to be used for sealing purposes a continuous bond may enhance the sealing performance of the assembled components as it provides a continuous seal between the two components.
If a sealing engagement is desired between the two components when they are in use that may be achieved even if the bond between them is not continuous by suitable forming of the components and/or manner of retaining them together in use.
The components to which the method is applied may be components for use in a joint between pipes or pipe-like articles. The thermoplastics component may thus be an end cap, for example, for a pipe connector and the thermosetting elastomeric component may be a seal which is secured in use by the end cap in sealing engagement with that connector and a pipe connected with the connector. Another use of components secured together by the present method may be in joints between guttering and fittings therefor for buildings.
The thermosetting elastomeric component enables a good seal to be achieved when required because it does not become permanently set when deformed and subjected to prolonged compressive force. When once set, therefore, to make sealing engagement with another article or component the elastomeric component can more reliably retain that engagement than has generally been the case with thermoplastic elastomeric sealing components. Because of the improved sealing function that the thermosetting elastomeric component is capable of performing the pre-assembled components may be used effectively in providing a long term sealed connection in a thermoplastic pipework system for underground application. In joints between guttering and guttering fittings in which the pre-assembled components form a part a longer lasting effective seal may be provided than could usually be expected from adhesively bonded joints.
It will be understood that the pre-assembled components may be for various other uses than those mentioned, including engineering uses.
According to a further aspect of the present invention there is provided an assembly comprising a thermosetting elastomeric component and a thermoplastics component secured together at adjacent surface portions by the method according to the first aspect of the invention set forth.
The components may be pre-formed in any convenient manner. They may be formed by conventional manufacturing processes. They do not necessarily have to be specially formed to enable them to be secured together by the method now provided. Thus the components may be of known forms of components which previously have not been secured together.
Accordingly, the invention does not necessitate special manufacturing techniques for the components. The essential requirement is for heat to be applied to the thermoplastics component in order to melt the surface portion and provide the bond between the components, and the heat may be applied in various ways without adding unduly to the cost and complexity of manufacture.
Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings in which: Figure 1 shows in cross-section a side view of a pipe end cap and seal secured together in accordance with the present invention; Figure 2 shows in cross-section an alternative end cap and seal, and Figure 3 shows a fragmentary perspective view of another elastomeric component and thermoplastic component secured together in accordance with the invention.
Referring to Figure 1 a thermosetting elastomeric component in the form of a circular sealing ring 1 is assembled and secured in a thermoplastics member in the form of a circular end cap 3 having a central orifice 4. The two components are moulded separately before they are assembled together. The end cap 3 is of substantially U-shaped cross section having an outer leg 5, an inner leg 7 and a base 9 forming a web between the two legs 5,7. The sealing ring 1 comprises a tubular ring 10 having an internal annular lip seal portion 11 which projects inwardly from the body 10 and an external, annular, locating flange portion 13 at one end of the body which seats on the base 9 of the end cap 3 between the inner and outer legs 5,7.
The sealing ring 1 and the end cap 3 are made of suitably compatible materials for bonding them together by heat. In one form for a joint between plastics pipes, for example, the sealing ring 1 is made of vulcanised epdm rubber and the end cap 3 is made of polypropylene. In another form the sealing ring 1 is made of a vulcanised nitrile based rubber with a pvc content of less than 5% and the end cap 3 is made of pvc. In both cases the sealing ring is vulcanised before it is assembled and secured in the end cap 3.
Assembly of the components simply requires insertion of the sealing ring 1 into the end cap 3 so that its locating flange portion 13 seats on the base 9 of the end cap. Discrete portions of the base 9 are then heated ultrasonically through the locating flange portion 13 of the sealing ring 1 to form a bond 15 between the sealing ring and the end cap. This heats both the end cap 3 and the sealing ring 1 in the localised area of application, the heat being transmitted through the sealing ring to melt the adjacent surface portion of the end cap which bonds at that portion to the sealing ring. The thermosetting vulcanised elastomeric material of the sealing ring 1 does not melt, being raised by the heating means to a temperature sufficient to melt the desired surface portion of the end cap 3, but insufficient to burn the sealing ring. A thickness typically in the order of 0.5mm is convenient for the portion of the elastomeric material through which the thermoplastics material is heated to be enough to provide the desired mechanical resistance but thin enough to allow for sufficient heat transfer.
The components are pre-assembled and secured together before they are fitted for use in a joint.
Their pre-assembly enables them to be readily fitted for use and reduces the risk that they are not in a properly engaged relationship to be used satisfactorily. The assembly and securing together of the components is conveniently carried out automatically in factory conditions.
In use of the assembled and secured components for connecting pipes the end cap 3 is secured on the end of a connector (not shown), the wall of the connector passing between its inner and outer legs 5,7, and the end face of the connector abutting the locating flange portion of the sealing ring and forcing the locating portion into sealing engagement with the end of the connector and the base 9 of the end cap 3. A pipe (not shown) is inserted through the central orifice 4 of the end cap, its outer circumferential surface being sealingly engaged by the lip seal portion 11 of the sealing ring 1.
Figure 2 shows an alternative arrangement where instead of a portion of the base 9 of the end cap 3 being bonded to the sealing ring 1, the bond 15 is formed at the outer leg 5 of the end cap. The locating flange portion 13 of the sealing ring has a raised peripheral rim 17 of wedge-shaped section which is bonded to the end cap, the outward thinning of the wedge-shaped section from the locating flange portion facilitating the passage of heat therethrough.
Although the invention has been particularly described in relation to an end cap and seal for circular pipes, it will be understood that the invention is applicable to the bonding of a thermosetting elastomeric component to a pre-formed thermoplastics component irrespective of the shape or form of the components, and irrespective of whether the assembly serves as a seal or has any other purpose.
Figure 3 shows a planar thermosetting elastomeric sealing member 20 which has been secured as by ultrasonic heating, in accordance with the invention to a planar thermoplastics carrier member 22.

Claims (14)

1. A method of securing a thermosetting elastomeric component to a thermoplastics component in which the pre-formed components are assembled together in a desired relationship and heat is applied to the thermoplastics component to cause a surface portion of that component to melt and become bonded to an adjacent surface portion of the elastomeric component.
2. A method according to Claim 1 in which the heat is applied through the elastomeric component, when the two components have been assembled together in the desired relationship, to melt the surface portion of the thermoplastics component.
3. A method according to Claim 1 or Claim 2 in which the heat is applied by ultrasonic heating means.
4. A method according to any preceding claim in which a portion of the elastomeric component has a reduced thickness to facilitate heat transfer through that portion to the surface portion of the thermoplastics component.
5. A method according to any preceding claim in which the bond formed between the elastomeric and thermoplastics member is continuous.
6. A method according to any preceding claim in which the material of the elastomeric component is vulcanisable.
7. A method according to Claim 6 in which the material of the elastomeric component is vulcanised prior to assembling the components together.
8. A method according to Claim 6 or Claim 7 in which the material of the elastomeric component is an ethylene propylene diene monomer based rubber elastomer and the material of the thermoplastics component is a polyolefin thermoplastics.
9. A method according to Claim 6 or Claim 7 in which the material of the elastomeric component is a nitrile based rubber elastomer and the material of the thermoplastics component is polyvinyl chloride.
10. A method according to Claim 9 in which the nitrile based elastomer contains polyvinyl chloride, the content of polyvinyl chloride being less than 5%.
11. A method according to any preceding claim in which the thermoplastics component is an end cap for a pipe connector and the elastomeric component is a seal.
12. An assembly comprising a thermosetting elastomeric component and a thermoplastics component secured together at adjacent surface portions by the method as claimed in any preceding claim.
13. A method of securing a thermosetting elastomeric component to a thermoplastics component substantially as described herein with reference to the accompanying drawings.
14. An assembly of a thermosetting elastomeric component and a thermoplastics component substantially as described herein with reference to any one of the accompanying drawings.
GB9501770A 1994-02-02 1995-01-30 Securing elastomeric and thermoplastics components together Expired - Fee Related GB2286148B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9501770A GB2286148B (en) 1994-02-02 1995-01-30 Securing elastomeric and thermoplastics components together

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Application Number Priority Date Filing Date Title
GB9401931A GB9401931D0 (en) 1994-02-02 1994-02-02 Securing elastomeric and thermoplastics components together
GB9501770A GB2286148B (en) 1994-02-02 1995-01-30 Securing elastomeric and thermoplastics components together

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GB9501770D0 GB9501770D0 (en) 1995-03-22
GB2286148A true GB2286148A (en) 1995-08-09
GB2286148B GB2286148B (en) 1997-10-01

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10313611A1 (en) * 2003-03-26 2004-10-07 Branson Ultraschall Niederlassung Der Emerson Technologies Gmbh & Co Flat composite product comprises partly cross-linked thermosetting resin part and fiber reinforced thermoplastic part joined by heat generation at the interface
US8790486B2 (en) 2001-07-31 2014-07-29 Advanced Composite Structure Australia Party Ltd Welding techniques for polymer or polymer composite components

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1592808A (en) * 1976-11-22 1981-07-08 Pont A Mousson Pipe connecting members
EP0142930A2 (en) * 1983-10-24 1985-05-29 General Motors Corporation Bonding EPDM gaskets to filled nylon heat exchanger parts
GB2203689A (en) * 1987-03-09 1988-10-26 Draka Polva Bv Plastics piping connector sealing ring
EP0156536B1 (en) * 1984-03-23 1990-07-04 Minnesota Mining And Manufacturing Company Spliceable sheet material and transfer tape for use in making same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1592808A (en) * 1976-11-22 1981-07-08 Pont A Mousson Pipe connecting members
EP0142930A2 (en) * 1983-10-24 1985-05-29 General Motors Corporation Bonding EPDM gaskets to filled nylon heat exchanger parts
EP0156536B1 (en) * 1984-03-23 1990-07-04 Minnesota Mining And Manufacturing Company Spliceable sheet material and transfer tape for use in making same
GB2203689A (en) * 1987-03-09 1988-10-26 Draka Polva Bv Plastics piping connector sealing ring

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8790486B2 (en) 2001-07-31 2014-07-29 Advanced Composite Structure Australia Party Ltd Welding techniques for polymer or polymer composite components
DE10313611A1 (en) * 2003-03-26 2004-10-07 Branson Ultraschall Niederlassung Der Emerson Technologies Gmbh & Co Flat composite product comprises partly cross-linked thermosetting resin part and fiber reinforced thermoplastic part joined by heat generation at the interface

Also Published As

Publication number Publication date
GB2286148B (en) 1997-10-01
GB9501770D0 (en) 1995-03-22

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