WO2005026413A1 - Electrode to be used in electrolytic refining and method for manufacturing the same - Google Patents

Electrode to be used in electrolytic refining and method for manufacturing the same Download PDF

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Publication number
WO2005026413A1
WO2005026413A1 PCT/FI2004/000504 FI2004000504W WO2005026413A1 WO 2005026413 A1 WO2005026413 A1 WO 2005026413A1 FI 2004000504 W FI2004000504 W FI 2004000504W WO 2005026413 A1 WO2005026413 A1 WO 2005026413A1
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WO
WIPO (PCT)
Prior art keywords
metal plate
edge
edge strip
electrode
groove
Prior art date
Application number
PCT/FI2004/000504
Other languages
Finnish (fi)
French (fr)
Inventor
Tom Marttila
Tero Raitanen
Original Assignee
Outokumpu Technology Oy
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 Outokumpu Technology Oy filed Critical Outokumpu Technology Oy
Publication of WO2005026413A1 publication Critical patent/WO2005026413A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
    • C25C7/02—Electrodes; Connections 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/154—Coating solid articles, i.e. non-hollow articles
    • B29C48/155—Partial coating thereof

Definitions

  • the invention relates to an electrode according to the independent claims and to a method for manufacturing said electrode.
  • the employed cathode electrode is a mother plate made for example of stainless steel, aluminum or titanium, and the metal to be refined is deposited on both sides of said mother plate by means of electric current.
  • the metal accumulated on the surface is at predetermined times removed from the mother plate.
  • electrolytic refining is carried out in tanks containing a sulfuric acid bearing electrolyte and, immersed in the electrolyte, plate-like anodes and cathodes in turn, both made of an electroconductive material.
  • the top edges of the anodes and cathodes are provided with lugs or bars, and the plates are suspended at the tank edges by said lugs or bars and connected to the electric circuit through them.
  • the metal to be produced is brought in the electrolytic process either in soluble, so-called active anodes, or as readily dissolved in the electrolyte in a preceding process step, in which case the employed anodes are non-soluble, so-called passive anodes.
  • the metal produced in electrolytic refining is deposited on all electroconductive surfaces of the mother plate, i.e. if the mother plate is completely electroconductive, the metal to be produced covers the mother plate as a uniform layer for the whole part that is immersed in the electrolyte.
  • the layers of the metal to be produced that are deposited on two sides of the mother plate are on three sides grown together over the narrow edges of the mother plate, and thus the deposits of the metal to be produced are extremely difficult to detach from the mother plate.
  • edge strips made of some insulating material, such as plastic.
  • edge strips are in cross-section trough-shaped plastic profiles that are pressed to the mother plate edges and that remain in place either owing to compression force created by the deformation, or to rivets installed through the mother plate, or to a combination of both factors. Owing to the structure of the edge strips, they become too thick with respect to the required insulation, and the contact between the edge strip and the mother plate is not compact, but both the electrolyte and the metal to be produced have access in the space therebetween.
  • the patent application Fl 863244 describes an edge strip that is placed in a dovetail-shaped groove made at the cathode edge, so that part of the edge strip is inserted in said groove for supporting the external part of the groove.
  • the US patent 6,264,808 describes an edge strip that is made of insulating material and installed at the sides of the electrode for preventing the growing together of the deposits created on all sides of the electrodes.
  • the object of the present invention is to eliminate some of the drawbacks of the prior art and to achieve a more wear-resistant electrode to be used in electrolytic refining.
  • the invention relates to an electrode to be used in electrolytic refining, said electrode comprising a metal plate, a suspension member attached to one edge of the metal plate and an edge strip made of insulating material attached at least to two edges of the metal plate, except to the edge fastening the suspension member, so that essentially on both surfaces of the metal plate, near the metal plate edge, there is made at least one groove for locking the edge strip in the metal plate, said groove comprising walls, and that the wall nearest to the metal plate edge forms with the metal plate an angle that is smaller than 90 degrees, preferably 30 - 60 degrees.
  • the force pulling the edge strip away from the metal plate creates a force that presses the metal plate towards the edge strip, so that the edge strip is not detached.
  • at least one of the groove walls is straight in shape.
  • the grooves extend essentially along the whole length of the metal plate edge.
  • the edge strip remains attached more rigidly in the metal plate.
  • the groove is essentially nearer to the inner edge of the edge strip than to the outer edge.
  • the employed material in the edge strip is plastic, such as ethylene acid copolymer.
  • the edge strip in connection with the metal plate edge, there is formed an edge strip, so that in the mold of an extruding machine, there is pressed edge strip material, at the same time as the metal plate is moved inside the extruding machine mold.
  • the edge strip material penetrates into the grooves provided in the metal plate and is solidified as edge strip, in the form defined by the mold.
  • the edge strip is provided at one edge at a time. Owing to the beveled shape of the groove, the edge strip preferably cannot be detached from the metal plate.
  • a rigid fastening of the edge strip to the metal plate advantageously prevents the electrolyte from entering the space between the edge strip and the metal plate.
  • Figure 1 b Cross-sectional view of figure 1 a at point A
  • Figures 1a and 1 b illustrate an electrode 1 according to the invention, including a metal plate 2 that is made of aluminum, as in the example.
  • Figure 1 b is a cross- sectional view of figure 1 a at point A.
  • a suspension member 3 suspending the metal plate in the electrolytic tank.
  • sufficiently deep grooves 4 are made by machining along the whole length of the metal plate edge, by means of which grooves the edge strip 5 is locked in the metal plate 2.
  • the grooves 4 are made on both surfaces 6 and 7 of the metal plate 2, and for one edge strip 5, there are made at least two grooves.
  • the groove is beveled and it comprises walls 9 and 13, in which case the angle B between the groove wall 9 located nearest to the edge 8 of the metal plate 2 and the metal plate surface 7 is smaller than 90 degrees, according to the example 45 degrees.
  • Said angle B here means the angle that is created between the wall 9 or 13 and the metal plate surface 6 or 7 located nearest to said wall.
  • the grooves 4 owing to their beveled shape, lock the edge strips 5 rigidly in the metal plate. If a force pulling away from the metal plate 2 is directed to the edge strip 5, the edge strip is due to its beveled grooves 4 pressed more tightly against the metal plate surface, and is thus not detached from the metal plate without being broken.
  • the walls 9 and 13 of the grooves according to the example are straight.
  • the grooves 4 are placed nearer to the inner edge 14 of the edge strip 5 than to the outer edge 15, in which case the outer edge is the one that extends to outside the metal plate in the sideways direction.
  • Figure 2 illustrates a method according to the invention for manufacturing an electrode.
  • the electrode according to the invention is manufactured in a continuously operated line, where the metal plate 2 is first moved to be machined, and the grooves 4 are made. Thereafter the metal plate 2 is moved so that its edge enters the mold 17 of an extrusion machine 16, and of a molten edge strip material 19, such as plastic, there is through the nozzle 18 extruded a mold-shaped edge strip 5 simultaneously as the metal plate 2 moves inside the mold.
  • the metal plate surface can be pretreated prior to the extrusion process.
  • the molten material When molten material is extruded in the mold, the molten material first penetrates into the grooves 4 made in the metal plate and is solidified in the desired form in the mold, extending around the metal plate edge 8, so that the metal deposited in the metal plate can neither grow over the edge nor penetrate into the space between the edge strip and the metal plate.
  • the mold is so long that the created edge strip 5 is sufficiently cooled inside it.
  • the metal plate and the edge strip move with respect to the extrusion machine.
  • the edge strip is solidified, and strip is provided along the whole length of the metal plate, the edge strip is cut at a suitable spot.

Landscapes

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

Abstract

The invention relates to an electrode (1) for electrolytic refining, said electrode comprising a metal plate (2), a suspension member (3) attached to one edge (10) of the metal plate and an edge strip (5) made of insulating material and fastened to at least two metal plate edges (8, 11, 12), except to the edge (10) fastening the suspension member, so that essentially on both surfaces (6, 7) of the metal plate (2), near to the metal plate edge, there is formed at least one groove (4) for locking the edge strip (5) to the metal plate, said groove comprising walls (9, 13), and the wall (9) located nearest to the metal plate edge (8, 11, 12) forms with the metal plate surface (7) an angle (B) that is smaller than 90 degrees. The invention also relates to a method for manufacturing the electrode.

Description

ELECTRODE TO BE USED IN ELECTROLYTIC REFINING AND METHOD FOR MANUFACTURING THE SAME
The invention relates to an electrode according to the independent claims and to a method for manufacturing said electrode.
In electric purification or refining, used as a sub-process in the production of metals, such as copper, nickel and zinc, the employed cathode electrode is a mother plate made for example of stainless steel, aluminum or titanium, and the metal to be refined is deposited on both sides of said mother plate by means of electric current. The metal accumulated on the surface is at predetermined times removed from the mother plate. Usually electrolytic refining is carried out in tanks containing a sulfuric acid bearing electrolyte and, immersed in the electrolyte, plate-like anodes and cathodes in turn, both made of an electroconductive material. The top edges of the anodes and cathodes are provided with lugs or bars, and the plates are suspended at the tank edges by said lugs or bars and connected to the electric circuit through them. The metal to be produced is brought in the electrolytic process either in soluble, so-called active anodes, or as readily dissolved in the electrolyte in a preceding process step, in which case the employed anodes are non-soluble, so-called passive anodes.
Owing to electric current, the metal produced in electrolytic refining is deposited on all electroconductive surfaces of the mother plate, i.e. if the mother plate is completely electroconductive, the metal to be produced covers the mother plate as a uniform layer for the whole part that is immersed in the electrolyte. In that case the layers of the metal to be produced that are deposited on two sides of the mother plate are on three sides grown together over the narrow edges of the mother plate, and thus the deposits of the metal to be produced are extremely difficult to detach from the mother plate. In order to make the deposits of the metal to be produced easy to detach from the mother plate surfaces, it is necessary to prevent the metal to be produced from growing over the narrow edges of the mother plate, i.e. the mother plate edges must be made non-conductive. The most general way to make mother plate edges non-conductive is to cover the mother plate edges by edge strips made of some insulating material, such as plastic. One type of edge strip and its use is described for instance in the Finnish patent Fl 101818. Generally edge strips are in cross-section trough-shaped plastic profiles that are pressed to the mother plate edges and that remain in place either owing to compression force created by the deformation, or to rivets installed through the mother plate, or to a combination of both factors. Owing to the structure of the edge strips, they become too thick with respect to the required insulation, and the contact between the edge strip and the mother plate is not compact, but both the electrolyte and the metal to be produced have access in the space therebetween. When an electrolyte has access to between the mother plate and the edge strip, this often results in an intensive corrosion of the mother plate, which further results in that the edge strip is detached, and the lifetime of the mother plate is essentially shortened. Moreover, when the metal to be produced begins to accumulate between the mother plate and the edge strip, the result is that first of all the edge strip is detached from the mother plate, and that the removal of the metal to be produced becomes essentially more difficult, which means that the edge strip is rapidly destroyed either when removing the metal to be produced, or owing to the wedging effect of the metal to be produced. In particular, the bottom edge strip provided on that edge of the mother plate that is located on the opposite edge with respect to the fastening of the hanger bar also is susceptible to damage, because the removal of deposits generally takes place from the direction of the hanger bar towards the bottom edge strip.
The patent application Fl 863244 describes an edge strip that is placed in a dovetail-shaped groove made at the cathode edge, so that part of the edge strip is inserted in said groove for supporting the external part of the groove. The US patent 6,264,808 describes an edge strip that is made of insulating material and installed at the sides of the electrode for preventing the growing together of the deposits created on all sides of the electrodes.
The object of the present invention is to eliminate some of the drawbacks of the prior art and to achieve a more wear-resistant electrode to be used in electrolytic refining.
The invention is characterized by what is set forth in the characterizing parts of the independent claims. Other preferred embodiments of the invention are characterized by what is set forth in the other claims.
Remarkable advantages are achieved by the arrangement according to the invention. The invention relates to an electrode to be used in electrolytic refining, said electrode comprising a metal plate, a suspension member attached to one edge of the metal plate and an edge strip made of insulating material attached at least to two edges of the metal plate, except to the edge fastening the suspension member, so that essentially on both surfaces of the metal plate, near the metal plate edge, there is made at least one groove for locking the edge strip in the metal plate, said groove comprising walls, and that the wall nearest to the metal plate edge forms with the metal plate an angle that is smaller than 90 degrees, preferably 30 - 60 degrees. By forming the junction according to the invention between the edge strip and the metal plate employed as the electrode, there is achieved an extremely long-lasting and robust electrode. By means of said angle, there is realized a fastening and locking effect between the edge strip and the electrode. Advantageously the force pulling the edge strip away from the metal plate creates a force that presses the metal plate towards the edge strip, so that the edge strip is not detached. According to a preferred embodiment of the invention, at least one of the groove walls is straight in shape. According to an embodiment, the grooves extend essentially along the whole length of the metal plate edge. Thus the edge strip remains attached more rigidly in the metal plate. According to an embodiment of the invention, the groove is essentially nearer to the inner edge of the edge strip than to the outer edge. Thus there is advantageously achieved a more rigid fastening between the edge strip and the metal plate. According to an embodiment, the employed material in the edge strip is plastic, such as ethylene acid copolymer.
According to the method of the invention, in connection with the metal plate edge, there is formed an edge strip, so that in the mold of an extruding machine, there is pressed edge strip material, at the same time as the metal plate is moved inside the extruding machine mold. The edge strip material penetrates into the grooves provided in the metal plate and is solidified as edge strip, in the form defined by the mold. According to an embodiment of the invention, the edge strip is provided at one edge at a time. Owing to the beveled shape of the groove, the edge strip preferably cannot be detached from the metal plate. A rigid fastening of the edge strip to the metal plate advantageously prevents the electrolyte from entering the space between the edge strip and the metal plate.
The invention is described in more detail below with reference to the appended drawings.
Figure 1 a An electrode according to the invention
Figure 1 b Cross-sectional view of figure 1 a at point A
Figure 2 Practical realization of the method according to the invention
Figures 1a and 1 b illustrate an electrode 1 according to the invention, including a metal plate 2 that is made of aluminum, as in the example. Figure 1 b is a cross- sectional view of figure 1 a at point A. To one edge of the metal plate 10, there is attached a suspension member 3 suspending the metal plate in the electrolytic tank. In the vicinity of the metal plate edges 8 and 11 , on the metal plate surfaces 6 and 7, sufficiently deep grooves 4 are made by machining along the whole length of the metal plate edge, by means of which grooves the edge strip 5 is locked in the metal plate 2. Thus part of the edge strip is placed in the groove. According to the example, the grooves 4 are made on both surfaces 6 and 7 of the metal plate 2, and for one edge strip 5, there are made at least two grooves. The groove is beveled and it comprises walls 9 and 13, in which case the angle B between the groove wall 9 located nearest to the edge 8 of the metal plate 2 and the metal plate surface 7 is smaller than 90 degrees, according to the example 45 degrees. Said angle B here means the angle that is created between the wall 9 or 13 and the metal plate surface 6 or 7 located nearest to said wall. Now the grooves 4, owing to their beveled shape, lock the edge strips 5 rigidly in the metal plate. If a force pulling away from the metal plate 2 is directed to the edge strip 5, the edge strip is due to its beveled grooves 4 pressed more tightly against the metal plate surface, and is thus not detached from the metal plate without being broken. The walls 9 and 13 of the grooves according to the example are straight. The grooves 4 are placed nearer to the inner edge 14 of the edge strip 5 than to the outer edge 15, in which case the outer edge is the one that extends to outside the metal plate in the sideways direction.
Figure 2 illustrates a method according to the invention for manufacturing an electrode. According to the example, near to the edge 8 of the metal plate 2, in both surfaces 6 and 7, there are machined grooves 4 for locking the edge strip 5 in the metal plate. The grooves 4 are made along the whole length of the metal plate edge. The electrode according to the invention is manufactured in a continuously operated line, where the metal plate 2 is first moved to be machined, and the grooves 4 are made. Thereafter the metal plate 2 is moved so that its edge enters the mold 17 of an extrusion machine 16, and of a molten edge strip material 19, such as plastic, there is through the nozzle 18 extruded a mold-shaped edge strip 5 simultaneously as the metal plate 2 moves inside the mold. When necessary, the metal plate surface can be pretreated prior to the extrusion process. When molten material is extruded in the mold, the molten material first penetrates into the grooves 4 made in the metal plate and is solidified in the desired form in the mold, extending around the metal plate edge 8, so that the metal deposited in the metal plate can neither grow over the edge nor penetrate into the space between the edge strip and the metal plate. In connection with the extrusion machine, there can be provided a cooling arrangement whereby the edge strip material is solidified onto the moving metal plate. However, the mold is so long that the created edge strip 5 is sufficiently cooled inside it. Throughout the extrusion process, the metal plate and the edge strip move with respect to the extrusion machine. When the edge strip is solidified, and strip is provided along the whole length of the metal plate, the edge strip is cut at a suitable spot. Thus there is manufactured and electrode that is readily provided with edge strips for electrolysis.
For a man skilled in the art, it is obvious that the various embodiments of the invention are not restricted to the above described examples only, but may vary within the scope of the appended claims.

Claims

1. An electrode (1) for electrolytic refining, said electrode comprising a metal plate (2), a suspension member (3) attached to one edge (10) of the metal plate and an edge strip (5) made of insulating material and fastened to at least two metal plate edges (8, 11 , 12), except to the edge (10) fastening the suspension member, characterized in that essentially on both surfaces (6, 7) of the metal plate (2), near to the metal plate edge, there is formed at least one groove (4) for locking the edge strip (5) to the metal plate, said groove comprising walls (9, 13), and that the wall (9) located nearest to the metal plate edge (8, 11 , 12) forms with the metal plate surface (7) an angle (B) that is smaller than 90 degrees.
2. An electrode according to claim 1 , characterized in that the angle (B) between the wall (9) located nearest to the metal plate edge (8, 11, 12) and the metal plate surface (7) is preferably 30 - 60 degrees.
3. An electrode according to any of the preceding claims, characterized, in that at least one of the walls (9, 13) of the groove (4) is straight in shape.
4. An electrode according to any of the preceding claims, characterized in that the grooves (4) extend essentially along the whole of the edge (8, 11 , 12) of the metal plate (2).
5. An electrode according to any of the preceding claims, characterized in that the groove (4) is located essentially nearer to the inner edge (14) of the edge strip (5) than to the outer edge (15) thereof.
6. An electrode according to any of the preceding claims, characterized in that the employed edge strip material is plastic, such as ethylene acid copolymer.
7. A method for manufacturing an electrode according to claim 1 , characterized in that an edge strip (5) is made in connection with the edge (8, 11 , 12) of the metal plate (2), so that edge strip material (19) is extruded in the mold (17) of an extrusion machine (16) at the same time as the metal plate (2) is moved inside the mold of the extrusion machine.
8. A method according to claim 7, characterized in that the edge strip material penetrates into the grooves (4) provided in the metal plate and is solidified as an edge strip, in a form defined by the mold (17).
9. A method according to any of the preceding claims, characterized in that the edge strip is made in one edge at a time.
PCT/FI2004/000504 2003-09-15 2004-08-31 Electrode to be used in electrolytic refining and method for manufacturing the same WO2005026413A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20031312A FI114555B (en) 2003-09-15 2003-09-15 Electrode for electrolytic refining used in the production of metals, e.g. copper, includes groove(s) formed on both surfaces of metal plate, near to metal plate edge, for locking edge strip to metal plate
FI20031312 2003-09-15

Publications (1)

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WO2005026413A1 true WO2005026413A1 (en) 2005-03-24

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PE (1) PE20050744A1 (en)
WO (1) WO2005026413A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010058080A1 (en) * 2008-11-19 2010-05-27 Outotec Oyj Method and equipment for providing the edge of a starting sheet with a dielectric strip
CN103668341A (en) * 2013-11-22 2014-03-26 云南和美佳科贸有限公司 Negative plate with insulating sealed edge

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798151A (en) * 1971-10-08 1974-03-19 Kobe Steel Ltd Deposition plate to be used as a starter blank or cathode for use in metal refining
JPH093698A (en) * 1995-06-21 1997-01-07 Showa Entetsu:Kk Electrode
WO1997021851A1 (en) * 1995-12-08 1997-06-19 Outokumpu Wenmec Oy Method for producing a mother plate for electrolytic cleaning and a mother plate produced according to said method
US6017429A (en) * 1995-08-21 2000-01-25 Svedala Skega Ab Cathode element and a method of its manufacture

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798151A (en) * 1971-10-08 1974-03-19 Kobe Steel Ltd Deposition plate to be used as a starter blank or cathode for use in metal refining
JPH093698A (en) * 1995-06-21 1997-01-07 Showa Entetsu:Kk Electrode
US6017429A (en) * 1995-08-21 2000-01-25 Svedala Skega Ab Cathode element and a method of its manufacture
WO1997021851A1 (en) * 1995-12-08 1997-06-19 Outokumpu Wenmec Oy Method for producing a mother plate for electrolytic cleaning and a mother plate produced according to said method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 199, no. 705 30 May 1997 (1997-05-30) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010058080A1 (en) * 2008-11-19 2010-05-27 Outotec Oyj Method and equipment for providing the edge of a starting sheet with a dielectric strip
ES2395959R1 (en) * 2008-11-19 2013-12-20 Outotec Oyj METHOD AND EQUIPMENT TO PROVIDE A DIELECTRIC STRIP TO THE EDGE OF AN INITIATING SHEET
US8617443B2 (en) 2008-11-19 2013-12-31 Outotec Oyj Method and equipment for providing the edge of a starting sheet with a dielectric strip
EA019716B1 (en) * 2008-11-19 2014-05-30 Ототек Оюй Method and equipment for providing the edge of a starting sheet with a dielectric strip
AU2009317137B2 (en) * 2008-11-19 2016-06-09 Metso Outotec Finland Oy Method and equipment for providing the edge of a starting sheet with a dielectric strip
CN103668341A (en) * 2013-11-22 2014-03-26 云南和美佳科贸有限公司 Negative plate with insulating sealed edge

Also Published As

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FI20031312A0 (en) 2003-09-15
FI114555B (en) 2004-11-15
PE20050744A1 (en) 2005-10-04

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