EP0426258B1 - Method and apparatus for manufacturing metal can bodies having an internal coating - Google Patents

Method and apparatus for manufacturing metal can bodies having an internal coating Download PDF

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Publication number
EP0426258B1
EP0426258B1 EP90202885A EP90202885A EP0426258B1 EP 0426258 B1 EP0426258 B1 EP 0426258B1 EP 90202885 A EP90202885 A EP 90202885A EP 90202885 A EP90202885 A EP 90202885A EP 0426258 B1 EP0426258 B1 EP 0426258B1
Authority
EP
European Patent Office
Prior art keywords
applying
bodies
coating
powder
successive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP90202885A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0426258A1 (en
Inventor
Anton Meijer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thomassen and Drijver Verblifa NV
Original Assignee
Thomassen and Drijver Verblifa NV
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=19855548&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0426258(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Thomassen and Drijver Verblifa NV filed Critical Thomassen and Drijver Verblifa NV
Publication of EP0426258A1 publication Critical patent/EP0426258A1/en
Application granted granted Critical
Publication of EP0426258B1 publication Critical patent/EP0426258B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
    • B05B13/0609—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies the hollow bodies being automatically fed to, or removed from, the machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/2676—Cans or tins having longitudinal or helical seams

Definitions

  • the invention relates to a method for manufacturing metal can bodies comprising the steps of:
  • the device can advantageously display the feature that the adhering means comprise two co-acting welding rollers, whereof the first engages on the outside and the second on the inside of said overlapping portions, which first welding roller is supported by the arm carrying the applying device.
  • the applying device is adapted for applying synthetic resin powder
  • the device can be further characterized by a heat treatment station for causing powder to melt, run out and enamel through supply of heat and the thus formed coating to cure through cooling.
  • the device may have the feature that the applying means are arranged for applying a coating on the entire inner surface of the successive bodies.
  • the device may also have the feature that the applying means are arranged for applying a coating over the seam of the overlapping zones. It is further possible for the device to have the feature that the applying means are arranged for applying a coating on the entire inner surface of the successive bodies and moreover a coating over the seam of the overlapping zones such that a coating of increased thickness is situated over the said seam.
  • the device For applying powder with great homogeneity and reliability over the entire surface for coating the device can be characterized by a charging station for electrically charging powder to be applied.
  • the device can be characterized by at least one tube of an insulating material, for instance PTFE (polytetrafluoroethylene) and a conductor for connection to earth arranged close fitting around it.
  • PTFE polytetrafluoroethylene
  • the device preferably displays the feature that via a conducting, for instance carbonaceous, medium such as a paste the isolator has a connection externally to metal, for example aluminium, for connection to earth.
  • a conducting, for instance carbonaceous, medium such as a paste the isolator has a connection externally to metal, for example aluminium, for connection to earth.
  • the invention also relates to a can body manufactured with the method according to the invention in addition to a can with such a body.
  • the invention offers a number of important advantages. Compared to processes with wet lacquer a considerable energy saving is possible, namely in the order of 40 to 60%.
  • the process according to the invention enables lacquer standardization. According to the invention, applying of the coating to successive objects takes place in a fluent, continuous movement relative to the applying station. The process therefore requires only one production line.
  • Fig. 1 shows a device 1 for manufacturing metal can bodies with an internal coating.
  • Device 1 comprises a stock holder 2 wherein a stack of metal sheets 3 is arranged.
  • a take-off member 4 the bottom sheet 3 is removed each time from the stack and guided in the direction of arrows 5 through a cracking station 6 in which the sheet is rid of residual stresses by light bending in opposing directions.
  • the relevant sheet After leaving the cracking station 6 the relevant sheet is bent round by means of bending rollers 7 to the rounded shape designated 3'.
  • the dimensioning of device 1 is such that the leading edge 8 of the bent round sheet 3' is arranged in a guide groove 9 in a guide block 10. This is shown in more detail in fig. 3.
  • the trailing edge 11 is arranged in a second guide groove 12 of block 10.
  • the tangential in-feed and axial transporting are carried out around an arm 14 which serves to bear a welding roller 15 and a spray nozzle 22, 23 (see also fig. 2 and 5).
  • An electric power unit 17 is connected via a power supply cable 18 to the outer welding roller 16 and via a power supply cable 19 to the inner welding roller 15.
  • the cable 19 extends through the arm 14.
  • the arm 14 is supported by a frame 20 and is also arranged to encase diverse lines, at least one of which can be connected to a reservoir for powder which has to be applied in a manner to be described hereinafter to the inner surface of the can bodies to be manufactured by device 1.
  • the relevant powder line can also be connected to a source of medium under pressure, in particular compressed air, for transporting and distributing the powder.
  • the mentioned spray nozzles 22 and 23 according to fig. 2 and 5 respectively form a cardan coupling with the end of the arm 14.
  • the guiding of the can bodies 3' in the vicinity of the welding rollers 15, 16 is performed by means of freely rotating rolls 24, the guiding function of which is taken over in the region of the spray nozzles 22, 23 by guide ropes 25.
  • An encasing 26 serves via a suction line 27 to draw off excess powder at the position of the spray nozzles 22, 23.
  • the positioning of the spray nozzles 22, 23 is carried out by external rolls 28 which are supported via the meanwhile finished, i.e. fixedly welded, can bodies 3'' by means of rolls 29 present on the end of the nozzles 22, 23. Attention is drawn to the fact that the guiding by the ropes and rolls has to take place such that undesired variations of position are prevented. Three sets of rolls for instance, distributed over the underside of the periphery, are sufficient in practice.
  • the spray nozzles 22, 23 distribute the powder 30, electrically charged in a manner to be further described, homogeneously over the inner surface of the finished can bodies 3''. A homogeneous application of a coating consisting of powder hereby takes place. As a result of the electrical charge transferred to the powder 30 this powder 30 adheres well to the relevant inner surface.
  • the spray nozzle 22 delivers the powder 30 at its extremity 31.
  • the variant according to fig. 5 also comprises a slot-like powder delivery opening 32 which is arranged on top of the spray nozzle 23 and which is provided on its side edges with brushes 33.
  • the opening 32 delivers a directed jet of electrically charged powder 30 for applying a coating over the seam 34 of the said overlapping zones of the can bodies 3'', namely the leading edge 8 and the trailing edge 11.
  • the spray nozzle 23 thus first performs an application of powder onto the seam 34 and then applies a layer of powder homogeneously over the whole inner surface. Thus achieved is that a coating of increased thickness is situated over the said seam 34.
  • applying a coating according to the invention can be carried out not only by making use of powder but use can also be made for instance of liquid means.
  • Means for electrically charging the powder are arranged in the spray nozzles 22, 23.
  • Use can for instance be made of a high-voltage transformer which receives its supply via the arm 14 and the frame 20.
  • One of the mentioned lines 21 can therefore provide such a supply.
  • a high-voltage transformer can be arranged in the spray nozzles 22, 23.
  • Fig. 7 shows the spray nozzle 22. This comprises eight charging tubes 35 for electrically charging powder 30 passed through at great speed according to arrows 36.
  • Fig. 8 shows such a charging tube 35. It comprises a PTFE tube 37, an intermediate tube 38 arranged therearound which is conducting because it contains carbon and, arranged around this latter, an aluminium tube 39 which is connected to earth 40 for draining static charge.
  • This structure is capable of charging the powder 30 through electrokinesis or frictional electricity to a voltage in the order of 40-80 kV, whereby a very effective coating of the powder on the inner surface of the can bodies 3'' is ensured.
  • control and measuring elements such as temperature sensors, which can form part of the device.
  • the invention offers a method and a device enabling can bodies with internal coating to be manufactured with very simple means from metal sheets in one processing run.
  • the performing of an additional manufacturing step, particularly the applying of a lacquer layer, is no longer necessary according to the invention.
  • the critical seam can be provided with an extra coating, while the rest of the surface is provided with the single, thinner layer. This is an advantage compared to the prior art, wherein the layer thickness must always correspond with the required relatively great layer thickness for covering a seam. On the one hand a cost saving can be realized, while on the other hand a better quality can also be ensured.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Coating With Molten Metal (AREA)
  • Laminated Bodies (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
EP90202885A 1989-11-01 1990-10-30 Method and apparatus for manufacturing metal can bodies having an internal coating Revoked EP0426258B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8902697 1989-11-01
NL8902697A NL8902697A (nl) 1989-11-01 1989-11-01 Werkwijze en inrichting voor het vervaardigen van metalen busrompen met een inwendige deklaag.

Publications (2)

Publication Number Publication Date
EP0426258A1 EP0426258A1 (en) 1991-05-08
EP0426258B1 true EP0426258B1 (en) 1994-07-27

Family

ID=19855548

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90202885A Revoked EP0426258B1 (en) 1989-11-01 1990-10-30 Method and apparatus for manufacturing metal can bodies having an internal coating

Country Status (6)

Country Link
EP (1) EP0426258B1 (da)
AT (1) ATE109040T1 (da)
DE (1) DE69011039T2 (da)
DK (1) DK0426258T3 (da)
ES (1) ES2057360T3 (da)
NL (1) NL8902697A (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011116485A2 (de) 2010-03-25 2011-09-29 Cosmocan Technology Ag Verfahren und vorrichtung zum herstellen von dosenkörpern sowie dosenkörper

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5821504A (en) * 1990-06-04 1998-10-13 Nordson Corporation Induction heating system for 360° curing of can body coatings
FR2687336B1 (fr) * 1992-02-14 1996-05-15 Jammes Ind Sa Ligne de production automatisee de viroles roulees soudees.
US5725670A (en) * 1994-02-18 1998-03-10 Nordson Corporation Apparatus for powder coating welded cans
DE69619155T2 (de) * 1995-05-10 2002-09-26 Nordson Corp., Westlake Induktionsheizsystem für Härtung über 360 Grad von Beschichtungen von Dosenkörpern
DE59610063D1 (de) * 1995-05-12 2003-02-27 Elpatronic Ag Bergdietikon Verfahren und Vorrichtung zur Innenbeschichtung von Behälterzargen
NL1008467C2 (nl) * 1998-03-04 1999-09-07 Hoogovens Staal Bv Werkwijze voor de vervaardiging van een dunwandige metalen en een zodanig vervaardigde bus.

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE714669C (de) * 1939-04-14 1941-12-05 Continental Can Co Verfahren und Vorrichtung zum nachtraeglichen Anbringen eines Lackueberzuges auf der Innenseite des Falzes bei der Herstellung von innen lackierten Blechdosenruempfen aus bis auf die Falzkanten lackierten Blechtafeln durch Runden, Falzen und Loeten
US3526027A (en) * 1967-05-29 1970-09-01 Continental Can Co Apparatus for coating side seam areas of containers
CA944438A (en) * 1970-02-10 1974-03-26 Paul Opprecht Method for automatic manufacture of metal container bodies
US3815544A (en) * 1971-01-19 1974-06-11 Nordson Corp Apparatus for striping inside seams of cans
US3733670A (en) * 1972-06-29 1973-05-22 Rheem Mfg Co Apparatus for making food containers
US4199672A (en) * 1977-11-10 1980-04-22 Geiss Edward G Apparatus for curing coatings on welded longitudinal seams of can bodies
JPS59177164A (ja) * 1983-03-21 1984-10-06 ジ−グフリ−ト・フライ 円筒形の缶の本体の溶接継目上に条片状の粉末の層を付着させる方法と装置
DE3574941D1 (de) * 1984-07-06 1990-02-01 Ribnitz Peter Verfahren zur innenbeschichtung von hohlkoerpern und anlage zur ausfuehrung des verfahrens.
CH673604A5 (da) * 1987-10-22 1990-03-30 Fael Sa

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011116485A2 (de) 2010-03-25 2011-09-29 Cosmocan Technology Ag Verfahren und vorrichtung zum herstellen von dosenkörpern sowie dosenkörper

Also Published As

Publication number Publication date
DK0426258T3 (da) 1994-11-28
EP0426258A1 (en) 1991-05-08
ES2057360T3 (es) 1994-10-16
DE69011039T2 (de) 1994-11-24
ATE109040T1 (de) 1994-08-15
DE69011039D1 (de) 1994-09-01
NL8902697A (nl) 1991-06-03

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