WO1997041280A1 - Improvements relating to cathode plate edge protectors - Google Patents

Improvements relating to cathode plate edge protectors Download PDF

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Publication number
WO1997041280A1
WO1997041280A1 PCT/AU1997/000246 AU9700246W WO9741280A1 WO 1997041280 A1 WO1997041280 A1 WO 1997041280A1 AU 9700246 W AU9700246 W AU 9700246W WO 9741280 A1 WO9741280 A1 WO 9741280A1
Authority
WO
WIPO (PCT)
Prior art keywords
edge
moulding
corner
cathode plate
strips
Prior art date
Application number
PCT/AU1997/000246
Other languages
French (fr)
Inventor
Rodger Connolly
Original Assignee
Marley Plastics Pty. Ltd.
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
Priority claimed from AUPN9523A external-priority patent/AUPN952396A0/en
Priority claimed from AUPO1065A external-priority patent/AUPO106596A0/en
Application filed by Marley Plastics Pty. Ltd. filed Critical Marley Plastics Pty. Ltd.
Priority to AU25619/97A priority Critical patent/AU2561997A/en
Publication of WO1997041280A1 publication Critical patent/WO1997041280A1/en

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25CPROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C7/00Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
    • C25C7/02Electrodes; Connections thereof
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/10Electrodes, e.g. composition, counter electrode
    • C25D17/12Shape or form

Definitions

  • the present invention relates to edge strip protection for cathode plates and particularly to such protection of the corners of the cathode plate.
  • cathode plates for electrolytic metal deposition particularly but not exclusively copper, and other non-ferrous materials is well known.
  • edge protection include dipping the edge of the cathode plate in a wax bath to prevent build up of metal along the edge portion.
  • edge protector creates small gaps at the joins and these gaps permit the growth of copper nodules beneath the edge protecting strip which defeats the prime purpose of the protecting strip and causes premature failure by mechanical failure through stretching of the legs of the strips. It is an objective of the present invention to overcome at least some of the disadvantages of the prior art in providing a method and apparatus for protecting the edge portions of a cathode plate assembly destined to be immersed in electrolytic solution.
  • a method of protecting the edge portions of a cathode plate assembly useful for electrolytic deposition techniques wherein the cathode plate is pre-fitted with bottom edge and side edge plastic strips, the plate and assembled edge strips being fitted into a plastic moulding apparatus such that the bottom edge portion corners of the plate are surrounded in the mould apparatus and comprising the step of injecting plastic into the mould cavity to form moulded corner pieces integrally connected to the edge strips.
  • the plate is apertured or otherwise configured to form a locking engagement with the moulded corner pieces after flowing of the plastic during the corner moulding process.
  • a corner moulding for a cathode plate adapted to interengage with side and bottom edge strips in which the moulding is preformed and adapted to be retained by clip means interconnecting the corner moulding and edge strips in sealing relationship with the cathode plate.
  • the clip means comprises releasable clips adapted to interconnect said corner moulding and side moulding preferably in releasable relationship. Sealant may be injected into the assembled corner moulding to improve sealing between the moulding and the plate.
  • the plastic corner pieces are therefore mechanically locked and fixed to the plate, and restrain the edges of the edge strip from expanding during the high temperature deposition process.
  • a method of protecting the edge and bottom portions of a cathode plate useful in electrolytic deposition techniques wherein edge portion strips destined to be fitted to the side and bottom edge portions of a cathode plate are joined in an assembled U configuration, plastic moulding of corner pieces to the joint between the bottom edge strip and at least one of the side edge strips prior to fitting of the edge strips to a cathode plate.
  • Figure 1 is a perspective view of an assembled corner mould without cathode plate.
  • Figure 7 is an exploded view of the components including the connecting clips.
  • the cathode plate 10 made of stainless steel is conventionally hung from a horizontal hanging rail 11 which grips the top edge of the cathode plate wherein the cathode plate is adapted to be immersed in an electrolytic bath (not shown) which in copper or like non-ferrous metal.
  • an electrolytic bath not shown
  • the edges of the cathode plate are kept free of any deposited metal, so that after removal of the cathode plate from the bulk, the deposited metal can be easily removed from the surface of the plate.
  • Figure 1 shows a prior art method using side plastic edge strips 1 and a waxed bottom edge 15.
  • the side and bottom edges have wax applied thereto to prevent build up of deposited metal.
  • this is a prior art attempt at forming mitred corners, together with bottom and side edge plastic strips fitted to the edge portions of the cathode plate.
  • FIGS 3, 4 and 5 of the drawings depict a practical arrangement of the present invention in which the cathode plate 10 is apertured in the bottom corners thereof, and then fitted with edge protectors 11 , 16 which may be of conventional form, along the side and bottom edge portions of the plate.
  • the bottom corner regions of the plate are inserted into an injection mould and compatible molten plastic is allowed to fill the mould to form a moulded corner 17 integrally formed with the cathode plate 10 and the edge protectors 11 , 16 as shown best in
  • edge protectors either fitted to the cathode plate or prior to fitting of the edge strips to the cathode plate.
  • the moulding of the corners to the edge strips in this embodiment includes the provision of an overlap in the joint between the edge and the corner mouldings 17 so that any thermal expansion of the plastic in the electrolyte bath is accommodated by the amount of overlap between the corner moulding and the edge strips, thus preventing any significant ingress of electrolytic material underneath the edge strips.
  • the cathode plate is provided with edge strips 20 as shown, which meet at each of the corners of the cathode plate.
  • the corner moulding 21 is adapted to slide over each adjacent end of the edge strip 20 to cover the corner of the cathode plate.
  • Upper and lower wedge clips 22 and 23 are adapted to snap fit into the edge strip and the corner moulding at each corner to retain the components effectively in sealing relationship.
  • the corner moulding is fabricated to be a snug fit over the adjacent ends of the edge strips 20 with the wedge clips 22 and 23 completing the enclosure of the adjacent ends of the edge strip to restrict ingress of material into the corner section of the cathode plate.
  • the internal surfaces of the clip may be grooved as shown at 24 to receive a sealant such as silicone or similar elastomeric material which has been injected into the joint to improve sealing between the corner moulding and the edge clip.
  • the present invention provides a useful alternative to the previous attempts at forming a clearly defined cathode plate edge free of any build up of electrolytic material.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Metals (AREA)

Abstract

The use of cathode plates for electrolytic copper deposition, coupled with mouldings fitted for edge protection is well established. These include such things as edge strips, gripping edge protectors and dipping in wax, to prevent build-up of the plated metal along the edge portion. These edge protectors are quite effective along the sides, but attempts to fit protectors to the bottom edge of the plates have resulted in the build-up of copper in the gaps at the corner of the plate or the growth of copper nodules beneath the protecting strip, occasioned by thermal expansion and resultant small gaps at the joins. Wax, moreover, dissolves in hot electrolyte solution, causing a build-up of sludge in the refining tanks with substantial reduction in the life and efficiency of the electrolyte. These problems have been overcome by prefiting the cathode plate (10) with bottom (16) and side (11) edge plastic strips, in which the bottom (16) and side (11) edge plastic strips, together with the corner pieces (17), are integrally moulded together, the bottom edge corners of the plate being surrounded in the mould, prior to the injection of the plastic. Alternatively, the bottom and side edge strips (20) and the corner pieces (21) may be prefabricated, so that the corner pieces (21) lock into the plate by means of apertures and are either joined to the bottom and side edge portions (20) by plastic moulding of the corner piece (21) to the joint between the aforesaid bottom and side edge portions (20) or upper (22) and lower (23) wedge clips may be used to snap fit the corner moulding (21) and the bottom and side edge portions (20) together in sealing relationship.

Description

IMPROVEMENTS RELATING TO CATHODE PLATE EDGE PROTECTORS
The present invention relates to edge strip protection for cathode plates and particularly to such protection of the corners of the cathode plate.
The use of cathode plates for electrolytic metal deposition particularly but not exclusively copper, and other non-ferrous materials is well known.
To simplify removal of deposited metal from the cathode plate after the process, it is desirable to protect the side and bottom of the cathode plate with mouldings fitted to the edge portions; or by the application of wax to the edge portions to prevent build up of copper on the edge portions. This facilitates the removal of the deposited metal.
Many disclosures occur in the patent literature in the field, for example AU Patent No. 646450 disclosing an edge strip with an expansion channel allowing for thermal expansion.
AU Patent No. 527416 disclosing a similar form of gripping edge protector as being two examples of the prior art.
Alternative means of edge protection include dipping the edge of the cathode plate in a wax bath to prevent build up of metal along the edge portion.
This is used particularly for the bottom edge of the cathode plate and is depicted by way of example in Figure 1 of the drawings herewith. In the process of refining copper and other non-ferrous metals, stainless steel cathode plates are suspended into an electrolyte solution adjacent to copper anodes.
Through an electrolysis process, pure copper is deposited onto the cathode plates from which it is subsequently removed through a mechanical stripping process.
The use of wax on the edge of the cathode plates, is not an ideal barrier to unwanted copper growth for a number of reasons. Namely that it is easily removed during handling through scratching and bumping of the cathodes, thus permitting the growth of copper in locations where it must be manually removed, and furthermore, some wax dissolves in the hot electrolyte solution causing a build up sludge in the refining tanks and a reduction in the life and efficiency of the electrolyte. Whilst the side edge protectors previously referred to operate effectively on the side edges of the plate, attempts to fit protectors to the bottom edge portion of the plate have met difficulties in the build up of copper in gaps at the corner of the plate as is best shown in Figure 2 of the drawings. The thermal expansion of the edge protector creates small gaps at the joins and these gaps permit the growth of copper nodules beneath the edge protecting strip which defeats the prime purpose of the protecting strip and causes premature failure by mechanical failure through stretching of the legs of the strips. It is an objective of the present invention to overcome at least some of the disadvantages of the prior art in providing a method and apparatus for protecting the edge portions of a cathode plate assembly destined to be immersed in electrolytic solution.
There is provided according to and aspect of the present invention a method of protecting the edge portions of a cathode plate assembly useful for electrolytic deposition techniques, wherein the cathode plate is pre-fitted with bottom edge and side edge plastic strips, the plate and assembled edge strips being fitted into a plastic moulding apparatus such that the bottom edge portion corners of the plate are surrounded in the mould apparatus and comprising the step of injecting plastic into the mould cavity to form moulded corner pieces integrally connected to the edge strips.
Conveniently, the plate is apertured or otherwise configured to form a locking engagement with the moulded corner pieces after flowing of the plastic during the corner moulding process. There is provided according to a further aspect the present invention a corner moulding for a cathode plate adapted to interengage with side and bottom edge strips in which the moulding is preformed and adapted to be retained by clip means interconnecting the corner moulding and edge strips in sealing relationship with the cathode plate. Conveniently the clip means comprises releasable clips adapted to interconnect said corner moulding and side moulding preferably in releasable relationship. Sealant may be injected into the assembled corner moulding to improve sealing between the moulding and the plate.
The plastic corner pieces are therefore mechanically locked and fixed to the plate, and restrain the edges of the edge strip from expanding during the high temperature deposition process.
In an alternative aspect of the invention, there is provided a method of protecting the edge and bottom portions of a cathode plate useful in electrolytic deposition techniques wherein edge portion strips destined to be fitted to the side and bottom edge portions of a cathode plate are joined in an assembled U configuration, plastic moulding of corner pieces to the joint between the bottom edge strip and at least one of the side edge strips prior to fitting of the edge strips to a cathode plate.
The invention will be described in greater detail having reference to the attached drawings in which Figures 1 and 2 represent prior art attempt at edge protection and Figures 3, 4 and 5 depict detailed sketches of the corner moulding technique of the present invention.
Figure 1 is a perspective view of an assembled corner mould without cathode plate.
Figure 7 is an exploded view of the components including the connecting clips.
With reference to the Figures, the cathode plate 10 made of stainless steel is conventionally hung from a horizontal hanging rail 11 which grips the top edge of the cathode plate wherein the cathode plate is adapted to be immersed in an electrolytic bath (not shown) which in copper or like non-ferrous metal. To facilitate removal of the deposited metal from the cathode plate, after this process, it is desirable that the edges of the cathode plate are kept free of any deposited metal, so that after removal of the cathode plate from the bulk, the deposited metal can be easily removed from the surface of the plate.
Figure 1 shows a prior art method using side plastic edge strips 1 and a waxed bottom edge 15.
In some other arrangements, the side and bottom edges have wax applied thereto to prevent build up of deposited metal. With reference to Figure 2, this is a prior art attempt at forming mitred corners, together with bottom and side edge plastic strips fitted to the edge portions of the cathode plate.
Unfortunately, it has been found that the mitred corners tend to spread slightly due to differential thermal expansion between the cathode plate and the plastic edge protectors which allows ingress of electrolytic fluid onto the plate depositing copper underneath the edge protectors, and this tends to expand and damage the edge protectors and furthermore, creates difficulty in removing the deposited metal from the surface of the cathode plate. Figures 3, 4 and 5 of the drawings depict a practical arrangement of the present invention in which the cathode plate 10 is apertured in the bottom corners thereof, and then fitted with edge protectors 11 , 16 which may be of conventional form, along the side and bottom edge portions of the plate.
Subsequent to fitting of the edge protectors to the plate, the bottom corner regions of the plate are inserted into an injection mould and compatible molten plastic is allowed to fill the mould to form a moulded corner 17 integrally formed with the cathode plate 10 and the edge protectors 11 , 16 as shown best in
Figures 4 and 5.
It will be appreciated that such a moulding technique can be utilised with the edge protectors either fitted to the cathode plate or prior to fitting of the edge strips to the cathode plate.
The moulding of the corners to the edge strips in this embodiment includes the provision of an overlap in the joint between the edge and the corner mouldings 17 so that any thermal expansion of the plastic in the electrolyte bath is accommodated by the amount of overlap between the corner moulding and the edge strips, thus preventing any significant ingress of electrolytic material underneath the edge strips.
With reference to Figures 6 and 7 of the drawings, an alternative arrangement is disclosed. The cathode plate is provided with edge strips 20 as shown, which meet at each of the corners of the cathode plate. The corner moulding 21 is adapted to slide over each adjacent end of the edge strip 20 to cover the corner of the cathode plate. Upper and lower wedge clips 22 and 23 are adapted to snap fit into the edge strip and the corner moulding at each corner to retain the components effectively in sealing relationship. In this regard, the corner moulding is fabricated to be a snug fit over the adjacent ends of the edge strips 20 with the wedge clips 22 and 23 completing the enclosure of the adjacent ends of the edge strip to restrict ingress of material into the corner section of the cathode plate. The internal surfaces of the clip may be grooved as shown at 24 to receive a sealant such as silicone or similar elastomeric material which has been injected into the joint to improve sealing between the corner moulding and the edge clip.
Thus the present invention provides a useful alternative to the previous attempts at forming a clearly defined cathode plate edge free of any build up of electrolytic material.

Claims

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:
1. A method of protecting the edge portions of a cathode plate assembly useful for electrolytic deposition techniques, wherein the cathode plate is prefitted with bottom edge and side edge plastic strips, the plate and assembled edge strips being fitted into a plastic moulding apparatus, such that the bottom edge portion corners of the plate are surrounded in the mould apparatus and comprising the step of injecting plastic into the mould cavity to form moulded corner pieces integrally connected to the edge strips.
2. A corner moulding for a cathode plate adapted to interengage with side and bottom edge strips in which the moulding is preformed and adapted to be retained by clip means, interconnecting the corner moulding and edge strips in sealing relationship.
3. A corner moulding as claimed in claim 2, wherein the clip means comprise releasable clips adapted to interconnect said corner moulding and side moulding preferably in releaseable relationship.
4. A clip means as claimed in claim 3, wherein the internal surface of the clip means is grooved to receive sealant injected into the assembled corner moulding to facilitate sealing between the moulding and the cathode plate.
5. A method of protecting the edge and bottom portions of a cathode plate useful in electrolytic deposition techniques, wherein edge portion strips destined to be fitted to the side and bottom edge portions of a cathode plate are joined in an assembled U configuration, plastic moulding of corner pieces to the joint between the edge strip and said side strips prior to fitting of the edge strips to the cathode plate.
6. A method as claimed in claim 1 or claim 6 wherein the cathode plate is apertured or otherwise configured to form a locking engagement with the moulded corner pieces after flowing of the plastic moulding material during the corner moulding process.
PCT/AU1997/000246 1996-04-26 1997-04-23 Improvements relating to cathode plate edge protectors WO1997041280A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU25619/97A AU2561997A (en) 1996-04-26 1997-04-23 Improvements relating to cathode plate edge protectors

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AUPN9523 1996-04-26
AUPN9523A AUPN952396A0 (en) 1996-04-26 1996-04-26 Improvements relating to cathode plate edge protectors
AUPO1065 1996-07-16
AUPO1065A AUPO106596A0 (en) 1996-07-16 1996-07-16 Improvements relating to cathode plate edge & corner protectors

Publications (1)

Publication Number Publication Date
WO1997041280A1 true WO1997041280A1 (en) 1997-11-06

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008011052U1 (en) 2008-08-19 2010-01-07 Rehau Ag + Co. Multi-part frame for an electrode for the electrolytic deposition of metals
JP2011006728A (en) * 2009-06-24 2011-01-13 Mitsubishi Materials Corp Edge part insulating member and method for producing the same
CN102859043A (en) * 2010-01-22 2013-01-02 雷奥两合股份公司 Lateral profile section for an electrode for the electrolytic deposition of metals
US20140116876A1 (en) * 2012-03-16 2014-05-01 Clim-A-Tech Industries, Inc. Cathode plate edge protector and methods of manufacture
USRE46212E1 (en) 2002-10-22 2016-11-22 William A. Ebert Edge protector systems for cathode plates and methods of making same
US9863050B2 (en) 2012-03-16 2018-01-09 Clim-A-Tech Industries, Inc. Cathode plate edge protector and methods of manufacture
WO2021035367A1 (en) * 2019-08-28 2021-03-04 New Tech Copper Spa Cathodic edge protection device
WO2022040718A1 (en) * 2020-08-29 2022-03-03 Icon Plastics Pty Ltd Plate edge protector

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207147A (en) * 1977-10-11 1980-06-10 Noranda Mines Limited Electrode for the electrolytic deposition of metals
NL8201312A (en) * 1982-03-30 1983-10-17 Aluart Aluminum Profiled strip corner connector - has socket for protruding hinge pin near one leg of pair
US4670124A (en) * 1985-08-31 1987-06-02 Norddeutsche Affinerie Aktiengesellschaft Cathode for use in the electrolytic refining of copper and method of making same
US4752350A (en) * 1986-04-30 1988-06-21 Firma Urban GmbH & Co. Maschinenbau KG Device for making welded corner joints
EP0294170A1 (en) * 1987-06-02 1988-12-07 National Profiles Limited Demountable corner joint for a panel frame and kit of parts for making same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207147A (en) * 1977-10-11 1980-06-10 Noranda Mines Limited Electrode for the electrolytic deposition of metals
NL8201312A (en) * 1982-03-30 1983-10-17 Aluart Aluminum Profiled strip corner connector - has socket for protruding hinge pin near one leg of pair
US4670124A (en) * 1985-08-31 1987-06-02 Norddeutsche Affinerie Aktiengesellschaft Cathode for use in the electrolytic refining of copper and method of making same
US4752350A (en) * 1986-04-30 1988-06-21 Firma Urban GmbH & Co. Maschinenbau KG Device for making welded corner joints
EP0294170A1 (en) * 1987-06-02 1988-12-07 National Profiles Limited Demountable corner joint for a panel frame and kit of parts for making same

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DERWENT ABSTRACT, Accession No. 43415C/25, Classes A85, M28; & DD,A,140 624 (VEB MANSFIELD-KOMB WILHEL), 19 March 1980. *
DERWENT ABSTRACT, Accession No. 83-812510/45, Class P27; & NL,A,82 01312 (ALUART ALUMINIUM), 17 October 1983. *
DERWENT ABSTRACT, Accession No. 92205388/25, Classes A28, M28; & JP,A,04 136 197 (MITSUBISHI MATERIALS CORP), 11 May 1992. *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE46212E1 (en) 2002-10-22 2016-11-22 William A. Ebert Edge protector systems for cathode plates and methods of making same
DE202008011052U1 (en) 2008-08-19 2010-01-07 Rehau Ag + Co. Multi-part frame for an electrode for the electrolytic deposition of metals
JP2011006728A (en) * 2009-06-24 2011-01-13 Mitsubishi Materials Corp Edge part insulating member and method for producing the same
CN102859043A (en) * 2010-01-22 2013-01-02 雷奥两合股份公司 Lateral profile section for an electrode for the electrolytic deposition of metals
US20140116876A1 (en) * 2012-03-16 2014-05-01 Clim-A-Tech Industries, Inc. Cathode plate edge protector and methods of manufacture
US9139922B2 (en) 2012-03-16 2015-09-22 Clim-A-Tech Industries, Inc. Cathode plate edge protector and methods of manufacture
US9863050B2 (en) 2012-03-16 2018-01-09 Clim-A-Tech Industries, Inc. Cathode plate edge protector and methods of manufacture
WO2021035367A1 (en) * 2019-08-28 2021-03-04 New Tech Copper Spa Cathodic edge protection device
WO2022040718A1 (en) * 2020-08-29 2022-03-03 Icon Plastics Pty Ltd Plate edge protector
US20220298662A1 (en) * 2020-08-29 2022-09-22 Icon Plastics Pty Ltd Plate edge protector

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