WO1986003697A1 - Electrostatic lubrication of cup-shaped can bodies - Google Patents
Electrostatic lubrication of cup-shaped can bodies Download PDFInfo
- Publication number
- WO1986003697A1 WO1986003697A1 PCT/US1985/002430 US8502430W WO8603697A1 WO 1986003697 A1 WO1986003697 A1 WO 1986003697A1 US 8502430 W US8502430 W US 8502430W WO 8603697 A1 WO8603697 A1 WO 8603697A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lubricant
- bodies
- application chamber
- particles
- borne
- Prior art date
Links
- 238000005461 lubrication Methods 0.000 title claims abstract description 22
- 239000000314 lubricant Substances 0.000 claims abstract description 83
- 239000002245 particle Substances 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract 7
- 239000002184 metal Substances 0.000 claims description 13
- 238000007600 charging Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000010687 lubricating oil Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims 1
- 230000001050 lubricating effect Effects 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 abstract 1
- 230000008021 deposition Effects 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 5
- 150000001768 cations Chemical class 0.000 description 4
- 239000004814 polyurethane Substances 0.000 description 4
- 229920002635 polyurethane Polymers 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 230000003190 augmentative effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 238000009432 framing Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000004264 Petrolatum Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000007786 electrostatic charging Methods 0.000 description 1
- 229920002457 flexible plastic Polymers 0.000 description 1
- 235000012055 fruits and vegetables Nutrition 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229940066842 petrolatum Drugs 0.000 description 1
- 235000019271 petrolatum Nutrition 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/001—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means incorporating means for heating or cooling, e.g. the material to be sprayed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B16/00—Spray booths
- B05B16/90—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth
- B05B16/95—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth the objects or other work to be sprayed lying on, or being held above the conveying means, i.e. not hanging from the conveying means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/08—Plant for applying liquids or other fluent materials to objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/007—Processes for applying liquids or other fluent materials using an electrostatic field
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
Definitions
- This invention is concerned with electrostatic lubrication of the interior and exterior surfaces of cup- shaped sheet metal can bodies.
- the present invention is concerned with in-line electrostatic lubrication of cup-shaped sheet metal articles during transport between work stations in a high speed can making operation wherein a plurality of can bod forming steps are carried out sequentially for continuous production of sheet metal can bodies.
- Development of deep drawn unitary can bodies fo use in the fabrication of two-piece sanitary cans is beco ing increasingly important commercially.
- the present invention provides for uniform lub cation of interior and exterior surfaces of cup-shaped sheet metal work product for introduction into work stations in a continuous-line manufacturing process.
- a desired lubricant established in liquid form is atomized 97 " ' ' / to gas-borne particle sizes which are then electrically charged.
- a can body travel path is established through a lubricant application chamber providing controlled passage of can bodies in spaced relationship to each other while minimizing; conveyance means contact with such can bodies to avoid'blocking of lubricant particle deposition which is carried out by electrical grounding of such-can bodies.
- a desired lubricant coating is obtained, e.g. of the type which eliminates the need for washing of the can bodies subsequent to manufacture.
- FIG. 1 is a schematic lay-out plan view of por- tions of a continuous can making line including in-line lubricating apparatus in accordance with the invention
- FIG. 2 is a schematic perspective view, with portions cut away and omitted for clarity, of lubricant application apparatus in accordance with the invention
- FIG. 3 is a schematic cross-sectional view, along a plane which is perpendicularly transverse- to-the direc- ' tion of movement of can bodies, of- lubricating .apparatus in accordance with the invention. • '
- FIG. 4 is a perspective view, with portions cut away and omitted for clarity, of lubrication apparatus in accordance with the invention
- FIG. 5 is a plan view of means for establishing travel paths through a lubricant application chamber in accordance with the invention.
- FIG. 6 is a side elevational view of the appara- tus of FIG. 5 showing in addition the location of a lubri ⁇ cation apparatus and framing support structure.
- sheet metal blanks are cut from continuous-strip flat rolled sheet metal, such as flat rolled steel having a protective coating or other suitable can making sheet metal stock.
- the blanks are formed into shallow cups, a step which can be carried out at the blanking station.
- Forming operations are cur ⁇ rently being developed and improved to enable economic production of extended-height sidewall unitary can bodies for use in the manufacture of two-piece cans to replace the conventional three-piece sheet metal cans used for food and beverages. Reshaping a flat sheet metal blank into a unitary can body with elongated side wall extending from its closed end so as to meet commercial requirements calls for improved deep drawing operations.
- the present invention provides for uniform interior and exterior surface lubrication with apparatus which can be located in high-speed can making lines in which cup shaped sheet metal work product is continuously moving from station to station.
- the invention facilitates such operations in providing desired lubrication without interference in the continuous movement of work product required for high speed manufacture of unitary can bodies.
- cup-shaped sheet metal can bodies are controllably con ⁇ veyed in spaced relationship to each other during passage through lubrication apparatus 15.
- Lubrication apparatus 15 includes a lubricant application chamber 20, as shown in FIG. 2, through which the travel path(s) for can bodies extend as shown in FIGS. 3 and 4.
- Lubricant application chamber 20 is defined by wall means, such as chamber bottom wall 21, side walls 22, 23, exit wall 24 and- entrance and top walls (not shown in the perspective view of FIG. 2) .
- such chamber defining wall means are free of electrical ground ⁇ ing and can be formed from non-electrically conductive plastic sheet stock such as polypropylene.
- lubricant par ⁇ ticles are generated in sizes permitting the lubricant particles to be borne and transported by a gaseous medium
- lubricant in a desired liquid form, as supplied or established using heat, is provided in lubricant reservoirs 25, 26.
- This lubricant sump arrangement is established by sump walls such as side walls 27, 28 and central divider wall 30; such sump walls which define the reservoirs for lubricant are also free of electrical grounding.
- Individual atomizing means, suc as 32, 33, are associated with each lubricant reservoir. Liquid lubricant is drawn from each reservoir and atomize utilizing suitable atomizing means, pneumatic or ultra ⁇ sonic; such atomizing means per se are known and commer- cially available.
- suitable heating means for controlling the temperature of the lubricant such as heating element 34, are provided to controllably establish and/or maintai desired lubricant temperature.
- Plural lubricant reservoirs each with associate atomizing means along with gas-borne lubricant flow means as taught herein, provide an atmosphere of dispensed gas- borne lubricant particles contiguous.!to all surfaces ⁇ of the work product-during us-lled passage through lubri- cant application chamber 20. Travel paths for can bodie such as 36, 37, 38 and 39 of F-IG. 3 are established in a unique manner which " contributes significant advantages. utilizing endless-belt loop means as shown in more detail and described in relation to FIGS. 4, 5 and 6.
- the movement of gas- borne lubricant particles is controlled and directed to multiple and diverse portions of lubricant application
- gas flow passages 40, 41 (FIG. 3) ; the latter are defined on opposite lateral sides of the lubricant application chamber by chamber walls 21, 22 in cooperation with passage walls 42, 43 respectively; similar gas flow passages (not shown) can be provided, e.g. at the leading end of chamber 20.
- the gas-borne lubricant particles enter the lubrication chamber 20 through apertures at a plurality of locations, such as 44, 45, 46 and 47, in chamber side wall 22, 23 as shown in FIG. 2.
- Aperture means are located for delivery of gas-borne lubricant particles into upper and lower portions of lubricant application chamber 20; e.g. above and below a horizontal travel path for work product as well as along the direction of movement between leading and trailing ends of such travel path.
- Such aperture means is selected to provide the desired gas borne lubricant-particle atmosphere about the travel path.
- the gas-borne lubricant particles are electri ⁇ cally charged by high voltage charging wires 48, 49 (FIG. 3) located above and below the can body travel path(s). As seen in FIGS. 2 and 4, a plurality of such charging wires are distributed along the direction of travel of ca bodies throughout the lubricant application chamber 20; such wires extend across substantially the full lateral dimension of such chamber. Electrostatic charging of gas- borne lubricant particles to desired voltage levels can b augmented at other locations between generation of the particles and their deposition on work product surfaces.
- the teachings of the invention provide means fo establishing travel paths through the lubricant applica ⁇ tion chamber including endless belt loop means which serv a plurality of functions. As shown in FIGS. 3 and 4, end less-belt loops are provided with a curvilinear exterior cross-sectional periphery which results in a tangential point contact with work product and minimizes blockage of or interference with deposition of lubricant particles.
- the can bodies are controllably conveyed and desired lubr cation is obtained with open ends of the can bodies directed downwardly, upwardly or horizontally.
- Flexible plastic tubular material -such as- ⁇ poly urethane round belting, available from Eagle Belting Co.
- loops 50, 51 contact edge portions at the downwardly-oriented open end of can body 39 to support its weight; endless loops 52, 53 contact the side wall of can body 39 at diametrically opposite sides to stabilize it in its upright position.
- FIG. 4 depicts means for electrically grounding can bodies during passage in spaced relationship through lubricant application chamber 20 using individual suspende ground contact means.
- can bodies 54, 55 and 56 are contacted by flexible metallic chains 58, 59, 6 and 61 during passage through chamber 20.
- Such flexible contact chains are grounded through wire 62, which is grounded to the support frame or otherwise; the other ground wires shown are similarly grounded.
- Exterior sur ⁇ faces of such elongated grounding wires are electrically insulated as they extend through the chamber 20 so as to avoid accumulation of lubricant particles and minimize cur rent loss.
- ground wire 63 is covered by elec trical insulation 66 for such purposes.
- the work product contact chains are exposed to the extent required for individual electrical grounding of can bodies.
- Flexible chain linkages e.g. of the key-chain type, provide desired flexibility and electrical contact.
- the periodic contact of such flexible chains with work product provides a self-cleaning action for lubricant whic might otherwise accumulate.
- the highly charged gas-borne lubricant particle are attracted to the grounded can bodies over their full interior and exterior surfaces because of the high poten ⁇ tial difference between the charged particles (up to abou 30,000 volts and higher) and the electrically grounded ca
- endless-belt loop means con ⁇ trol passage of can bodies of a particular configuration along a selected travel path.
- can body 39, and the other can bodies along its travel path have a larger diameter than can body 38, and the other can bodi along the latter's travel path.
- teachings of the presen invention relating to adjustable location of the endless belt loops as described in more detail later in relatio to FIGS. 5 and.6, enable implementation of this feature
- Line speed along a travel path is controlled b drive means.
- Surface areas of the particular type of ca bodies in separate travel paths can vary within reasonab limits when using the same line speed for all of the tra paths while still accomplishing de.sired uniform lubricat
- Individual drive, means for the endless-belt loops enable differing line speeds for separate travel paths in can m ing lines equipped with work stations at the exit end. of the lubricant application chamber to accommodate the . can bodies; this further increases the range of can body sizes that can be handled in the separate travel paths through a common application chamber.
- the quantitative supply of gas-borne particles can be regulated by gas supplied to the lubrican sumps.
- gas flow from the atom ⁇ izing area to the deposition area is selectively adjusted to the speed of the line; that is, at line speeds above a selected median, the gas flow is increased; at line speeds below the selected median, the gas flow is decreased.
- the movement or "flow rate" of lubricant particles into the chamber can be regulated by regulating gas, e.g. air, supplied to the lubricant sump(s).
- gas can be supplied as a part of the pneumatic atomizing and/or sup ⁇ plied or augmented by regulating gas supplied separately to the sump(s), as shown.
- Such separately supplied gas to the sump(s) can be regulated.to,control-,gas flow.from-.the atomizing area t the deposition area to supply lubricant particles in accordance with requirements of the line speed.
- An additional feature of the invention provides for grounding of the spaced can bodies through specially selected material for the endless-belt loop means.
- Elec ⁇ trical conductive particles such as graphite, mixed "" witlT
- the can body support loops 44, 45 are formed of such electrically conductive endless-belt loop material
- grounding can be further implemented by making endless loops 52, 53 electrically conductive so th a can body, such as 39, is grounded along its side wall.
- an insulated grou ing wire is positioned above each work product travel pa and extends in the direction of work product movement.
- Flexible metallic chains exposed for electrical contact with each can body, are electrically connected to the ground wires.
- Four such flexible conductors are connect to each ground wire along each travel path in the embodi ment shown so that plural periodic grounding of each can body occurs during its controlled passage between entran port 70 and exit port 72 of the lubricant applicant appl cation chamber 20.
- Charging wires, such as 73, 74, 76 a 77, which extend laterally of the chamber, are positione to provide'charged particles dispersed about such- travel
- endless-belt loops for defining each travel path for continuous-line passage through deposition chamber means are shown in plan view along with pulley support means.
- pulleys 78, 79 support endless-belt loops 80, 81 which contact the end of a can body (as shown open end down) for support thereof.
- Pulleys 82, 83 and 84, 85 support endless-belt loops 86, 87 which contact the side wall of a can body at diametrically opposite sides thereof.
- Different pulleys can be substituted to establis dimensionally differing travel paths and/or the pulleys ca be adjustably mounted along support shafts 88, 89.
- the number of travel paths can be varied, the width between
- FIG. 6 shows the lubrication apparatus 15 in place on support framing mem ⁇ bers, such as 90, 92, which include means for adjusting th vertical position of such lubrication apparatus.
- Drive means including driveshaft 94 are provided as well as loop tension adjustment means 96, for the endless-belt loops.
- Groups of endless-belt loops which establish a travel path can be driven together.
- the present teachings also provide for individual loops-to be driven individually; for example, loops on diametrically opposite sides of a vertically oriented can body can be driven at slightly differing speeds to provide a slow rotational movement of a can body about its central longi ⁇ tudinal axis during passage through chamber 20.
- Non-conductive 1/2" diameter poly- urethane tubing Electrically conductive
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- General Engineering & Computer Science (AREA)
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- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US68163084A | 1984-12-14 | 1984-12-14 | |
US681,630 | 1984-12-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1986003697A1 true WO1986003697A1 (en) | 1986-07-03 |
Family
ID=24736093
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1985/002430 WO1986003697A1 (en) | 1984-12-14 | 1985-12-10 | Electrostatic lubrication of cup-shaped can bodies |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0203995A1 (en) |
WO (1) | WO1986003697A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1986005421A1 (en) | 1985-03-15 | 1986-09-25 | Weirton Steel Corporation | Drawn can body method, apparatus and products |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US24602A (en) * | 1859-06-28 | Let-off motion foe | ||
US2658009A (en) * | 1948-05-13 | 1953-11-03 | Ransburg Electro Coating Corp | Electrostatic coating method and apparatus |
US2730988A (en) * | 1950-06-10 | 1956-01-17 | Ransburg Electro Coating Corp | Electrostatic coating apparatus |
US3645778A (en) * | 1969-01-06 | 1972-02-29 | Owens Illinois Inc | Metal oxide coatings on glass |
US4170193A (en) * | 1976-04-16 | 1979-10-09 | Ball Corporation | Apparatus for applying lubricating materials to metallic substrates |
US4204497A (en) * | 1977-09-14 | 1980-05-27 | Volstatic Holding Limited | Electrostatic coating apparatus having conveyor belt, fluidizing and electrostatic means for recirculation of coating particles |
US4278711A (en) * | 1980-01-14 | 1981-07-14 | Ball Corporation | Apparatus and method for the lubrication of cans |
-
1985
- 1985-12-10 EP EP86900462A patent/EP0203995A1/en not_active Ceased
- 1985-12-10 WO PCT/US1985/002430 patent/WO1986003697A1/en not_active Application Discontinuation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US24602A (en) * | 1859-06-28 | Let-off motion foe | ||
US2658009A (en) * | 1948-05-13 | 1953-11-03 | Ransburg Electro Coating Corp | Electrostatic coating method and apparatus |
US2730988A (en) * | 1950-06-10 | 1956-01-17 | Ransburg Electro Coating Corp | Electrostatic coating apparatus |
US3645778A (en) * | 1969-01-06 | 1972-02-29 | Owens Illinois Inc | Metal oxide coatings on glass |
US4170193A (en) * | 1976-04-16 | 1979-10-09 | Ball Corporation | Apparatus for applying lubricating materials to metallic substrates |
US4204497A (en) * | 1977-09-14 | 1980-05-27 | Volstatic Holding Limited | Electrostatic coating apparatus having conveyor belt, fluidizing and electrostatic means for recirculation of coating particles |
US4278711A (en) * | 1980-01-14 | 1981-07-14 | Ball Corporation | Apparatus and method for the lubrication of cans |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1986005421A1 (en) | 1985-03-15 | 1986-09-25 | Weirton Steel Corporation | Drawn can body method, apparatus and products |
Also Published As
Publication number | Publication date |
---|---|
EP0203995A1 (en) | 1986-12-10 |
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