Classifications

• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
  • C25D5/02—Electroplating of selected surface areas
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
  • C25D17/004—Sealing devices
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
  • C25D17/005—Contacting devices
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
  • C25D17/02—Tanks; Installations therefor
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
  • C25D5/02—Electroplating of selected surface areas
  • C25D5/026—Electroplating of selected surface areas using locally applied jets of electrolyte
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
  • C25D5/04—Electroplating with moving electrodes
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
  • C25F3/00—Electrolytic etching or polishing
  • C25F3/16—Polishing
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
  • C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating

Definitions

• Embodiments of the claimed invention relate to electropolishing and electroplating, and in particular, systems and methods for electropolishing or electroplating localized areas of continuous assemblies of interconnected components, such as conveyor belts.
• Conveyor belt systems are used in various industrial fields for material handling and processing purposes. For instance, conveyor systems are used within food processing systems in which food items are placed on the support surface of a conveyor belt and processed, while being conveyed from one location to another.
• Various types of conveyor belts exist, including modular conveyor belts, which are especially popular in food processing systems.
• conveyor systems are often used in a helical accumulator such as that disclose in U.S. Pat. No. 5,070,999 to Layne et al. which allows storage of a large number of items in the conveyor system.
• conveyor belts are sanitary. To accomplish this, conveyor belts are conventionally wiped down, washed, and/or steamed on a regular basis. However, conveyor belts are often very long, extending hundreds or even thousands of feet. In these cases, the belts can be difficult to clean and may become less durable over time due to the thorough process needed to maintain their sanitation.
• U.S. Patent No. 4,895,633 to Seto et al. discloses a conventional molten salt electroplating apparatus for forming plating on steel strips, sheets, and wires.
• a steel strip is continuously unwound from a pay-off reel, passed through a looper, and sent to a pretreatment apparatus.
• the surface of the steel strip is plated as it passes between electrodes immersed in electroplating solution.
• the steel strip is then washed and dried, passed through a looper and a shearing machine, then wound onto a tension reel.
• U.S. Patent No. 5,491,036 to Carey, II et al. generally discloses an electrolysis process for applying a tin coating of carbon steel.
• one aspect of the present invention provides a continuous electropolishmg and/or electroplating process for localized areas of metal conveyor belts.
• This process provides benefits such as improved sanitation, improved product release characteristics, brighter cosmetic appearance, removal of weld discoloration, and reduced wear and friction, which are particularly important for conveyor belts used in food processing.
• embodiments of the present invention pass the product through a housing supplied with a continuous directional flow of electrolyte.
• the electroplating or electropolishmg can be targeted to specific areas of the product, such as the edges of a conveyor belt, and straight products can pass through the housing without deformation (i.e., because guiding by rollers into and out of a bath is not required).
• fresh electrolyte can be concentrated at the polishing site, without solution in a bath of used electrolyte, for more effective electropolishing or electroplating.
• Belts can be separated into smaller sections, typically 50 to 100 feet long, for ease of handling and shipping. These sections may be connected sequentially, such that the leading end of a new roll of belt is connected to the trailing end of the previous roll of belt, to maintain a continuous process. These sections can be disconnected and placed on separate take-up rolls after processing. Leader chains may also be used to guide the ends of the belt into and out of the bath while maintaining tension. Materials used in the process, such as the plate material and electrolyte material, may be of any suitable type such as are currently used or may be developed for electropolishing and electroplating.
• a system for electropolishing or electroplating a conveyor belt comprises a housing comprising an electrical conductor and an opening configured to receive a portion of the conveyor belt in the opening; a seal provided in the opening; an inlet configured to supply electrolytic solution to the housing; and an electrical contact configured to apply current to the conveyor belt.
• a method for electropolishing or electroplating a conveyor belt comprises guiding a portion of the conveyor belt through a housing comprising an electrical conductor and a seal; applying current to the conveyor belt with an electrical contact; and supplying an electrolytic solution to the housing through an inlet, thereby electroplating or electropolishing the portion of the conveyor belt.
• FIG. 1 is a perspective view of a system for electropolishing or electroplating a continuous assembly of interconnected components in accordance with an embodiment.
• FIG. 2 is a perspective view of a system for electropolishing or electroplating a continuous assembly of interconnected components in accordance with an embodiment.
• FIG. 3 is a perspective view of a system for electropolishing or electroplating a continuous assembly of interconnected components in accordance with an embodiment.
• FIG. 1 is a perspective view of a system for electropolishing or electroplating a continuous assembly of interconnected components in accordance with an embodiment.
• the continuous assembly of interconnected components is a conveyor belt 105.
• two housings 115A and 115B are positioned at the edges of conveyor belt 105 in order to electropolish or electroplate edge links 120A and edge links 120B, respectively.
• only a single housing 115A or 115B can be positioned on an edge of conveyor belt 105 to electropolish or electroplate only one of edge links 120 A or edge links 120B, respectively.
• housing 115B is cutaway in FIG. 1 for purposes of explanation only, and that in practice, the exterior of housing 115B resembles housing 115 A. Further, it is understood that the interior of housing 115A resembles that shown with respect to housing 115B. Although not shown in FIG. 1, it is contemplated that other features of the conveyor belt may be electropolished or electroplated with or instead of edge links 120 A and edge links 120B, such as edge guards or lane dividers.
• Electrical contacts 11 OA and HOB placed on conveyor belt 105 cause the conveyor belt 105 to become an anode (in the case of electropolishing) or cathode (in the case of electroplating).
• Force may be placed on electrical contact 11 OA and/or electrical contact HOB to ensure consistent contact with conveyor belt 105 and consistent current.
• Such a force can be applied by a spring, a pneumatic system, a hydraulic system, gravity, and/or similar means.
• electrical contact 11 OA and/or electrical contact HOB are movable or floating to accommodate variations in the dimensions of conveyor belt 105.
• an electrical conductor 125B is placed in housing 115B to serve as a cathode (in the case of electropolishing) or anode (in the case of electroplating).
• an electrical conductor (not shown) is placed in housing 115A to serve as a cathode (in the case of electropolishing) or anode (in the case of electroplating).
• electrical conductor 115B is placed proximate to the edge of edge links 120B in order to target polishing or plating at the weld 135B of conveyor belt 105.
• electrical conductor 115B can be placed in any position proximate to any particular area to be electropolished or electroplated.
• housing 115A and housing 115B are made of copper or another conductive material, and can themselves serve as a cathode (in the case of electropolishing) or anode (in the case of electroplating), with or without electrical conductors internal to housing 115A or housing 1 15B.
• Housing 115 A, housing 115B and the electrical conductors i.e., the electrical conductor internal to housing 1 15A and electrical conductor 125B
• the electrical conductors can be sized and positioned such that the surface of the electrical conductors are equidistant from all surfaces of edge links 120A and edge links 120B for even polishing.
• Nonconductive wear surfaces may be placed in housing 115A and housing 115B in any practical configuration, such as a bushing or perforated liner, to prevent contact between conveyor belt 105 and the electrical conductors, to prevent contact between conveyor belt 105 and the electrical conductors while allowing current to flow between the electrical conductors and conveyor belt 105.
• housing 115A and housing 115B can be of any shape or size suitable to achieve electropolishing or electroplating as described herein. Further, housing 115A and housing 115B can be constructed as a single body, or can be made of separable components, such as a body and removable lid.
• Electrolyte may be introduced at any point along the length of housings 115A and 115B.
• electrolyte is introduced into housing 115A via inlet 130A. It is understood that electrolyte is introduced into housing 115B via a similar inlet (not shown). Electrolyte may flow in either direction through housings 115A and 115B, i.e., in the direction of travel of conveyor belt 105 through housings 115A and 115B, or counter to the direction of travel of conveyor belt 105 through housings 115A and 115B.
• housings 115A and 115B are open at the ends to allow electrolyte to flow out and to allow conveyor belt 105 to pass through.
• a separate orifice is provided for the electrolyte outflow.
• the outflow orifice may be arranged in an upward direction to facilitate removal of gases produced during the electropolishing or electroplating process.
• Orifices are sized to restrict outflow, and housings 115A and 115B are provided with seals 140A and 140B, respectively, so that the housings 115A and 115B are flooded to a level that provides effective electropolishing or electroplating.
• Seals 140A and 140B need not stop liquid flow altogether, but rather restrict it enough to cause flooding of the housing.
• Exemplary seals can be made of rubber sheeting or brushes.
• FIG. 2 is a perspective view of a system for electropolishing or electroplating a continuous assembly of interconnected components in accordance with another embodiment.
• the continuous assembly of interconnected components is a conveyor belt 205 having a plurality of center links 220 to be electropolished or electroplated.
• Center links 220 are any links positioned between the edges of conveyor belt 205, and do not necessarily need to be centered between the edges of conveyor belt 205.
• Center links 220 are positioned laterally to create a desired turn radius and to control expansion and collapse of the edge links of conveyor belt 205.
• a single housing 215 is positioned along the width of the conveyor belt 205 in order to electropolish or electroplate center links 220. It is understood that housing 215 is cutaway in FIG.
• housing 215 is rectangular in shape in use.
• other features of the conveyor belt may be electropolished or electroplated with or instead of center links 220, such as edge guards or lane dividers.
• center links 220 such as edge guards or lane dividers.
• FIG. 2 it is contemplated that multiple columns of center links 220 may be present, or multiple other features to be electropolished or electroplated, as well as their accompanying housings.
• Electrical contacts 21 OA and 210B are placed on conveyor belt 205 in a manner similar to that described with respect to electrical contacts 11 OA and HOB of FIG. 1.
• An electrical conductor 225 is placed in housing 215 to serve as a cathode (in the case of electropolishing) or an anode (in the case of electroplating).
• electrical conductor 225 is placed on the bottom of housing 215, underneath both of the welded edges 235A and 235B of center links 220.
• electrical conductor 225 can be placed in any position proximate to any particular area to be electropolished or electroplated.
• housing 215 can be made of copper or another conductive material, and can itself serve as a cathode (in the case of electropolishing) or anode (in the case of electroplating), with or without electrical conductors internal to housing 215.
• Housing 215 and electrical conductor 225 can be sized and positioned such that the surface of the electrical conductor 225 is equidistant from all surfaces of center links 220 for even polishing.
• Nonconductive wear surfaces may be placed in housing 225 in any practical configuration, such as a bushing or perforated liner, to prevent contact between conveyor belt 205 and the electrical conductors, to prevent contact between conveyor belt 205 and the electrical conductors while allowing current to flow between the electrical conductors and conveyor belt 205.
• housing 215 can be of any shape or size suitable to achieve electropolishing or electroplating as described herein. Further, housing 215 can be constructed as a single body, or can be made of separable components, such as a body and removable lid.
• Electrolyte is introduced via inlet 230 at a central location with respect to the length and width of housing 215, as is described with respect to FIG. 1. Electrolyte may flow in either direction through housing 215, i.e., in the direction of travel of conveyor belt 205 through housing 215, or counter to the direction of travel of conveyor belt 205 through housing 215.
• housing 215 is open at the ends to allow electrolyte to flow out and to allow conveyor belt 205 to pass through.
• a separate orifice may instead be provided for the electrolyte outflow.
• Housing 215 is provided with a seal 240 so that the housing 215 is flooded to a level that provides effective electropolishing or electroplating, while minimizing electrolyte loss.
• seal 240 is positioned on both sides of center links 220.
• FIG. 3 is a perspective view of a system for electropolishing or electroplating a continuous assembly of interconnected components in accordance with an embodiment.
• the continuous assembly of interconnected components is conveyor belt 305.
• conveyor belt 305 is unrolled from an in- feed roll 340 into cleaning station 345, traveling in a direction A.
• Cleaning station 345 cleans the edge links of conveyor belt 305 and degreases them, for example.
• Conveyor belt 305 is then rinsed at rinse station 350.
• Electroplating or electropolishing is achieved at electroplating/electropolishing stations 355. Although illustrated with two electroplating/electropolishing stations 355, it is contemplated that only a single electroplating/electropolishing station 355 can be provided, or multiple electroplating/electropolishing stations 355 can be provided in series. Electroplating/electropolishing stations 355 have housings 315A to polish one edge of the conveyor belt, as well as housings opposite to housing 315A (not shown) to polish the opposite edge of conveyor belt 355. It is contemplated that housings 315A, as well as the opposing housings, may be similar or identical to housings 115A and 115B, respectively, of FIG. 1.
• conveyor belt may be electropolished or electroplated with or instead of the edge links of conveyor belt 305, such as edge guards or lane dividers.
• Electrolytic solution is provided via inlets 330A to housings 315A, immersing the edges of conveyor belt 305 within the housings 315A in electrolytic solution.
• conveyor belt 305 Once conveyor belt 305 has been electropolished or electroplated, it is moved into post-treatment station 360 (where it undergoes, e.g., a nitric acid rinse), then undergoes a final rinse at rinse station 365.
• conveyor belt 305 can be moved through a dryer (not shown).
• Conveyor belt 305 is moved onto take-up roll 370. It is contemplated that conveyor belt 305 can be moved from in-feed roll 340 to take-up roll 370 by any suitable means, such as, for example, a system drive or motor.
• FIG. 3 can be modified to instead or additionally electropolish or electroplate center links, if present.

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• 2013
  • 2013-08-22 EP EP13756787.1A patent/EP3036356A1/en active Pending
  • 2013-08-22 WO PCT/US2013/056151 patent/WO2015026348A1/en active Application Filing
  • 2013-08-22 CA CA2918137A patent/CA2918137C/en active Active
  • 2013-08-22 MX MX2016002309A patent/MX2016002309A/es active IP Right Grant
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  • 2013-08-22 JP JP2016536069A patent/JP6093916B2/ja not_active Expired - Fee Related
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