GB2167317A - Melting plastics surfaces - Google Patents

Melting plastics surfaces Download PDF

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Publication number
GB2167317A
GB2167317A GB8427760A GB8427760A GB2167317A GB 2167317 A GB2167317 A GB 2167317A GB 8427760 A GB8427760 A GB 8427760A GB 8427760 A GB8427760 A GB 8427760A GB 2167317 A GB2167317 A GB 2167317A
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GB
United Kingdom
Prior art keywords
plastics
fusion
melting
fusion component
perfluoroalkoxy
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.)
Withdrawn
Application number
GB8427760A
Other versions
GB8427760D0 (en
Inventor
Robert Hamilton Hanker
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB8427760A priority Critical patent/GB2167317A/en
Publication of GB8427760D0 publication Critical patent/GB8427760D0/en
Publication of GB2167317A publication Critical patent/GB2167317A/en
Withdrawn legal-status Critical Current

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
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—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
    • 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • 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
    • 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
    • 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
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • 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
    • 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
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/007—Hardness
    • 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
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

A method of melting a plastics comprising contacting the surface with a heated fusion component having a release coating of a perfluoroalkoxy resin.

Description

SPECIFICATION Melting of plastics surfaces The present invention relates to a method of melting a plastics surface and particularly to the jointing of plastics components.
Plastics tubes (particularly polythene tubes) may be jointed together by a fusion technique which makes use of metallic fusion heads.
The fusion heads may be of complex or simple shape and, when heated (e.g. to 220 C), are used for melting specific surface areas of a plastics tube (usually in the region of an end thereof) so that this tube may be affixed to a similar plastics pipe to which it becomes jointed by subsequent solidification of the melted plastics surface. The fusion head may be shaped to provide this joint in the form of a socket-weld or butt-weld as desired and are usually of aluminium which transmits heat rapidly to the plastics pipe to ensure local melting. The technique allows continuous lengths of plastics pipes may be produced.
The fusion heads are generally provided with a release coating to facilitate removal of the plastics tube with melted surface from the head.
Generally the release coating is p.t.f.e. (polytetrafluoroethylene).
The p.t.f.e. coating on the fusion head is produced by depositing p.t.f.e. on the head from an aqueous p.t.f.e. dispersion (containing any required additions) and subsequently heating the p.t.f.e. above its melting point to form a continuous coating of p.t.f.e. on the head.
P.t.f.e. is a long chain molecule which undergoes a first order transition at 342 C. The material is of such high molecular weight that it does not flow at the melt temperature (as is common with most thermoplastics) but relies on particle to particle fusion where contact occurs. This provides a coherent film.
However such films also possess inherent weaknesses. Among these are poor abrasion resistance, low hardness values and above all a tendency for the voids in the film to act as anchor points for some materials which come into contact with the film. When anchoring occurs, particles of materials lodge in the voids and present keying points for further quantities of material which in time will form a barrier or partial barrier on the p.t.f.e. surface thus causing a deterioration in ability of the p.t.f.e. to act as a release surface.
The materials which form such barriers are often of organic origin and at elevated temperatures they decompose, albeit slowly, leaving a residue of carbon which may act as a contaminant.
Additionally, equipment coated with thin films of p.t.f.e. for release applications should be handled quite carefully since they are quite easily damaged through abrasion or by impact with hard materials during the normal course of use.
It has been found that a p.t.f.e. film used as a release coating on aluminium fusion heads in the gas industry exhibits all of the wealknesses described above.
The environment in which most of this work is carried out is harsh and the socket and butt welding equipment are continually abraded by and impacted with the natural surroundings.
In due course of time-anything from 3 weeks to 2 months duration the various elements of the environment abrade scratch and knock the surface. Polyethylene then begins to adhere to the release surfaces of the p.t.f.e.
and becomes difficult to remove. Subsequent joints can be suspect as a result of "pick-up" of polyethylene material on the fusion head.
This is detrimental for the following reasons:first, loss of material in the pipe welding area and second, perhaps far more importantly, decomposition and breakdown to carbon of residues on the fusion head due to prolonged contact with the hot surface. Such scars of material are anchored into and across the voids in the p.t.f.e. film. Such carbon residues can contaminate subsequent welded sections of the p.e. pipe and present a possibility for joint breakdown under pressure.
It is an object of the present invention to obviate or mitigate the abovementioned disadvantages.
According to the present invention there is provided a method of melting a plastics surface comprising contacting the surface with a heated fusion component having a release coating of a perfluoroalkoxy resin.
The fusion component is preferably metallic, most preferably of aluminium.
The invention is applicable particularly to the jointing of plastics (particularly polyethene) pipes using the above described technique.
A range of perfluoroalkoxy resins has been introduced in recent years. These generally take the form of aqueous dispersions and finely divided dry poweders which can be used for applying films to substrate materials.
The properties of these materials differ from p.t.f.e. in the following respects. They have a higher degree of hardness, their resistance to abrasion is improved and above all as a result of having a true melting point (ca 315 C) they actually flow at melt temperature so that complete cohesion may be assumed which is achieved whilst the material passes through it's melt state.
As a result, a coating is produced which has superior release properties and which prevents other materials from becoming anchored thereto due to the absence of voids.
The continuous upper limit of temperature for the perfluoroalkoxy resin is 260 C, the same as for p.t.f.e.
Extensive trials have been carried out with aluminium fusion heads (coated with perfluoroalkoxy resin) for a period of 6 months. One of the socket fusion heads has been examined after this time and has been found to be free from carbon deposited nuclei and whilst there are areas which have been lightly abraded whilst in service these are of a minor nature and the head can be further used thus extending the time in service beyond 6 months.
In order further to promote the life of the coated fusion heads a single undercoat of a mixture of PFA with 25% weight added of polyetherether keton (PEEK) followed by two applications of the unfilled PFA has been used in our work.
The PEEK is a thermoplastic material with a melting point of 3340C which may be processed in a similar manner to the PFA material.
The PEEK has a hardness value on the Rockwell scale of R126 and extremely high abrasion resistance when compared with any of unfilled fluorocarbon or perfluorocarbon resins. It's upper temperature limit in use is compatible with PFA and it is anchored in the present example by the matrix of the PFA resin which surrounds it in the sub-layer. PEEK is included primarily to give some measure of support to the PFA film above it, which acts as the release and the antistick component.
PEEK also acts as a buffer against breakthrough or cut through by sharp implements thus also protecting the fusion head. This is particularly important in the case of aluminium fusion heads as these are relatively soft.
The perfluoroalkoxy polymers used in the method of the invention may, for example, be a polymer of a perfluoroalkyl-perfluorovinyl ether or a copolymer thereof with a perffuro- alkene.
As a modification of the abovedescribed embodiment, the PFA/PEEK base layer may be omitted and the perfluoroalkoxy polymer layer may include fillers such as mica or finely divided amorphous on graphitic carbon.

Claims (6)

1. A method of melting a plastics surface comprising contacting the surface with a heated fusion component having a release coating of a perfluoroalkoxy resin.
2. A method as claimed in claim 1 wherein the fusion component is metallic.
3. A method as claimed in claim 2 wherein the fusion component is aluminium.
4. A method as claimed in any one of claims 1 to 3 wherein the perfluoroalkoxy resin is a polymer of a perfluoroalkoxy-perfluorovinyl ether or a copolymer thereof with a perfluoalkene.
5. A method as claimed in any one of claims 1 to 4 wherein the fusion component have an intermediate coating of a mixture of PFA with 25% weight of polyetherether keton.
6. A method of jointing two plastics pipe wherein a surface of at least one of the pipes has been melted by the method as claimed in any one of the proceeding claims.
GB8427760A 1984-11-02 1984-11-02 Melting plastics surfaces Withdrawn GB2167317A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8427760A GB2167317A (en) 1984-11-02 1984-11-02 Melting plastics surfaces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8427760A GB2167317A (en) 1984-11-02 1984-11-02 Melting plastics surfaces

Publications (2)

Publication Number Publication Date
GB8427760D0 GB8427760D0 (en) 1984-12-12
GB2167317A true GB2167317A (en) 1986-05-29

Family

ID=10569156

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8427760A Withdrawn GB2167317A (en) 1984-11-02 1984-11-02 Melting plastics surfaces

Country Status (1)

Country Link
GB (1) GB2167317A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1557230A (en) * 1975-07-21 1979-12-05 Du Pont Fluorpolymer coatings
EP0014974A2 (en) * 1979-02-22 1980-09-03 Hoechst Aktiengesellschaft Coating and printing composition based on a copolymer of tetrafluoroethylene and a perfluor(alkylvinyl) ether, and its use
US4321177A (en) * 1980-08-12 1982-03-23 Wilkinson James H Sprayable perfluoroalkoxy solutions
EP0056280A2 (en) * 1981-01-13 1982-07-21 E.I. Du Pont De Nemours And Company Article coated with fluoropolymer finish with improved durability
US4344993A (en) * 1980-09-02 1982-08-17 The Dow Chemical Company Perfluorocarbon-polymeric coatings having low critical surface tensions

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1557230A (en) * 1975-07-21 1979-12-05 Du Pont Fluorpolymer coatings
EP0014974A2 (en) * 1979-02-22 1980-09-03 Hoechst Aktiengesellschaft Coating and printing composition based on a copolymer of tetrafluoroethylene and a perfluor(alkylvinyl) ether, and its use
US4321177A (en) * 1980-08-12 1982-03-23 Wilkinson James H Sprayable perfluoroalkoxy solutions
US4344993A (en) * 1980-09-02 1982-08-17 The Dow Chemical Company Perfluorocarbon-polymeric coatings having low critical surface tensions
EP0056280A2 (en) * 1981-01-13 1982-07-21 E.I. Du Pont De Nemours And Company Article coated with fluoropolymer finish with improved durability

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Publication number Publication date
GB8427760D0 (en) 1984-12-12

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