WO2004039506A2 - Reparation de la rainure d'un couvercle d'une boite de boisson au moyen d'un materiau pouvant secher sous uv - Google Patents

Reparation de la rainure d'un couvercle d'une boite de boisson au moyen d'un materiau pouvant secher sous uv Download PDF

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Publication number
WO2004039506A2
WO2004039506A2 PCT/US2003/034127 US0334127W WO2004039506A2 WO 2004039506 A2 WO2004039506 A2 WO 2004039506A2 US 0334127 W US0334127 W US 0334127W WO 2004039506 A2 WO2004039506 A2 WO 2004039506A2
Authority
WO
WIPO (PCT)
Prior art keywords
lid
applying
heating
exposing
energy
Prior art date
Application number
PCT/US2003/034127
Other languages
English (en)
Other versions
WO2004039506A3 (fr
Inventor
Thomas E. Hollstein
Charles F. Nagy
Mark W. Novotny
Original Assignee
Nordson Corporation
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 Nordson Corporation filed Critical Nordson Corporation
Priority to AU2003285027A priority Critical patent/AU2003285027A1/en
Publication of WO2004039506A2 publication Critical patent/WO2004039506A2/fr
Publication of WO2004039506A3 publication Critical patent/WO2004039506A3/fr

Links

Classifications

    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B05D3/0281—After-treatment with induction heating
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0218—Pretreatment, e.g. heating the substrate
    • B05D3/0245—Pretreatment, e.g. heating the substrate with induction heating
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating
    • 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
    • B05D1/002—Processes for applying liquids or other fluent materials the substrate being rotated
    • 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
    • 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
    • B05D2202/00—Metallic substrate

Definitions

  • the invention relates generally to apparatus and methods for applying material onto a surface. More particularly, the invention relates to applying material to a surface with the material being of the type that can cure quickly.
  • Containers such as beverage containers often include a lid having what is commonly known as an “easy open” or “pop top” lid.
  • Such lids typically include a tab that is manually pivoted by the consumer so as to cause a frangible portion of the lid to separate from and bend away the main lid body, thereby providing an opening to access the contents such as by drinking or pouring.
  • the lids are manufactured with a score line.
  • the score line is characterized by a thinned portion of the lid wall which makes it easier to open the container under force of the tab.
  • the score line typically extends around all or part of the lid, and a small portion also typically extends under the tab.
  • Container lids especially those that are used to hold ingestible products, are usually first coated with a suitable material such as tin plating. This coating becomes scratched or otherwise damaged or removed during the scoring process, especially in the area of the score line itself. It is known to repair the score line portion of the lid, for example, by applying a two part epoxy coating. The primary purpose ofthe re-coat is to prevent corrosion. Score line repair with a two part coating is a very expensive and inefficient process.
  • the ovens typically are quite large, often times vertically arranged because the can lids must traverse through them for adequate cure times.
  • the ovens typically use costly gas heat. And some coatings may require 10-15 minute cure times or longer. This significantly slows down throughput or results in very large ovens and conveyors, requiring a substantial area of manufacturing space.
  • the invention contemplates in one aspect use of an ultraviolet (UN) curable material applied to a surface.
  • a UN curable material is applied to a can lid, in particular a score line.
  • the UV curable material is used to repair damage to the lid coatings that can occur as a result of the scoring process.
  • the UN curable material is used in lieu of conventional two part epoxy materials.
  • the UN curable material is at least partially or completely cured by exposing the material to UN energy.
  • a preferred although not required aspect ofthe material is that it cure in response to heat application as well as UN energy.
  • application of the UN curable material to a surface is facilitated by an optional preheat step.
  • the can lid is preheated such as by use of an induction or other suitable heating mechanism.
  • the preheat operation is performed by an induction heater that surrounds a stacker device.
  • the lids are heated as they pass through the stacker to a holder used to present the workpieces to a material application device such as a spray gun.
  • the preheating step is performed before application of the UN curable material to the surface. Alternatively, the preheating may occur coincident with the application of the material to the surface. Uniform application may also be enhanced by imparting relative rotation between the can lid and the application device.
  • a suitable application device may be, for example, an airless spray gun.
  • an optional second heating step may be performed after exposing the material to UN energy. The second heating step may be by use of induction heating or other suitable heating mechanism.
  • Fig. 1 is a schematic representation of a material application system that incorporates the invention.
  • Fig. 2 is an exemplary heater in longitudinal cross-section suitable for use in the system of Fig. 1.
  • the present invention is directed to apparatus and methods for application of UN curable material onto a surface or workpiece, such as a can lid.
  • a surface or workpiece such as a can lid.
  • the invention is described herein with particular reference to applying a UN curable material to repair a score line on a can lid, such description is intended to be exemplary in nature and should not be construed in a limiting sense. Those skilled in the art will readily appreciate that the invention will find use in many other applications for different types of surfaces and workpieces, including but not limited to containers, lids and so on. Additionally, various aspects of the invention are described and illustrated herein as embodied in the exemplary embodiments. These various aspects however may be realized in alternative embodiments, either alone or in various combinations and sub-combinations thereof.
  • the system 10 includes an indexing spray machine 12.
  • the indexing spray machine includes a stacker 14 in which a plurality of workpieces 16 may be placed.
  • a rotatable turret 18 includes a plurality of workpiece holding chucks 20. The chucks 20 are each used to individually grab a workpiece as it rotates past the stacker 14.
  • the workpieces may be held against the chuck by suction for example.
  • a magnetic chuck may be used or other suitable technique.
  • the heater 22 is optional and is used to improve flow of a material onto the workpieces, as will be described.
  • the heater 22 is used to preheat the workpieces before the UN curable material is applied thereto.
  • the heater 22 is realized in the form of an induction heater that uses magnetic energy to heat the workpiece.
  • Other heater devices may be used, and alternatively a heater may be used that heats the material 25 and/or the workpiece 16 as the material is applied.
  • the material 25 may be heated as part of the application device 23 and/or the source container for the material 25.
  • the workpieces are presented to a material application device 23 that is in fluid communication with a source of UN curable material 25.
  • the material 25 is preferably but not necessarily, a material that is typically in a liquid state when applied to the workpiece.
  • the material 25 cures or hardens when exposed to UN energy.
  • the application device 23 is a liquid spray gun.
  • the spray gun is airless so as to reduce or minimize overspray. UV curable materials tend to be rather expensive so it is desirable to apply as little material as needed to properly coat the workpiece.
  • a suitable spray gun is a model MEG II, part no.
  • Such a spray gun has a very small spray orifice that permits very small amounts of the material 25 to be directed onto the workpiece. Typical amounts dispensed may be on the order of about 5-20 mg or less, however, this range is only exemplary is not intended to be construed in a limiting sense.
  • Proper control of the applied quantity of material not only produces a cost savings but also can reduce frilling or hairing which can occur when excess material is applied. Frilling is an effect whereby too much material produces jagged particles around the edge of a score line when the can lid is opened.
  • the chucks 20 are also used optionally to spin the workpieces at a fairly high rate of speed, such as for example but not by way of limitation, about 1000-1500 rpm.
  • the spray application device 23 may be mounted in a suitable mechanism that rotates the spray gun relative to the workpiece.
  • a suitable drive mechanism (not shown) may be used to effect such spinning, as is well known to those skilled in the art.
  • the indexing spray machine 12 further includes an inverter mechanism 24 that flips each workpiece onto a conventional conveyor 26 so that the sprayed side is up.
  • a suitable spray indexing machine 12 that is commercially available is model no. 107-LID available from H. L. Fisher Manufacturing Co., Inc. of Des Plains, IL.
  • An alternative system including the control functions associated therewith is described in United States Patent Nos. 5,612,096 and 5,520,735 issued to Mulder et al., the entire disclosures of which are fully incorporated herein by reference.
  • Those skilled in the art will readily appreciate that many different forms of spray machines and indexing/positioning machines may be used with the present invention.
  • the conveyor 26 is conventional in design and transports the sprayed workpieces 16 to a UV energy source 28.
  • a suitable UV source or lamp 28 is described in United States Patent No. 6,619,819 issued to Stowell et al., the entire disclosure of which is fully incorporated herein by reference.
  • the UV lamp 28 may be flashed on as each workpiece is presented thereto by the conveyor 26. Alternatively, the UV lamp can be left on for longer periods or even continuously.
  • the UV coating material will at least partially cure and in most cases nearly completely cure in a short period of time.
  • the material 25 may be exposed to UV energy for about 1 second or less. This short exposure time allows for a high throughput, such as for example 300 workpieces per minute.
  • an optional second heater 30 may be used.
  • the second or post-cure heater 30 is used to again heat the workpieces to complete the cure of the material 25 and depending on the choice of material to improve its adherence to the workpiece.
  • the second heater 30 may be realized in the form of a conventional induction heater such as model no. ISC-1 A available from Nordson Corporation, Westlake, Ohio.
  • the first and second heaters 22, 30 may heat the workpieces to any desired temperature to optimize application of the material 25 thereto, such as, for example, about 200 °F.
  • the second heater 30 also helps to ensure cure of the applied material that is under the tab as the tab may prevent full exposure to the UV energy.
  • the first heater 22 which is optionally used to preheat the can lids 26, includes a frame 40 that encloses an induction coil 42.
  • the workpieces may pass through a central passageway 44 in which may be positioned the stacker 14 (see Fig. 1). Additional openings 46 may be provided to receive cooling fans (not shown).
  • a more detailed description and understanding of a suitable induction heater suitable for use as the preheat device 22 is provided in United States Patent No. 5,529,703 issued to Sprenger et al., the entire disclosure of which is fully incorporated herein by reference.
  • a significant advantage of the present invention is that the use of a UV curable material greatly reduces the complexity and size of the material application system.
  • the material can be cured quickly and there is no need for a large oven or long dwell times in order to ensure adequate cure of the material. This greatly increases workpiece throughput volume and substantially reduces the size ofthe operation within a manufacturing facility.
  • the preheat device 14 is used to improve the flow of the small quantity of material applied to the workpiece. Flow of the material 25 on the surface of the workpiece is also facilitated by spinning the workpiece as described hereinabove. This is particularly useful when applying UV curable material to repair a scored can lid, because typically the score line extends under the manual tab. Simple spraying might cause the obstructed portion of the score line to be missed. By spinning the workpiece as well as the optional preheat step, the UV curable material flows more evenly and completely to cover the score line even under the tab.
  • the present invention contemplates the methods embodied in the use of the aforementioned apparatus. Moreover, the invention contemplates a method for repairing a score line by applying a UV curable material thereto and exposing the applied material to a source of
  • This method may include optional steps of spinning the workpiece while applying the material thereto, preheating the workpiece prior to or coincident with applying the material thereto, and heating the workpiece after the material has been at least partially cured by exposure to UV energy.
  • Still further options of the exemplary method include applying the material by spraying, such as with an airless spray gun, and heating the workpieces with induction heating.
  • the invention also contemplates the method of applying a UV curable material to a workpiece surface by first preheating the workpiece, then applying the material to the workpiece and then exposing the applied material to UV energy.
  • the method may include the above described additional optional method steps, and in particular the step of heating the workpiece after the applied material has been exposed to the UV energy.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention porte sur un appareil et sur des procédés permettant d'appliquer un matériau sur une surface, ce matériau pouvant sécher sous ultraviolet (UV). Le matériau peut notamment être utilisé pour réparer les rainures des couvercles des boîtes de boisson. Ce procédé et cet appareil peuvent éventuellement comprendre des opérations de préchauffage et de post-chauffage après l'application du matériau sur le couvercle. L'application peut s'effectuer par pulvérisation et le chauffage peut s'effectuer par induction.
PCT/US2003/034127 2002-10-28 2003-10-28 Reparation de la rainure d'un couvercle d'une boite de boisson au moyen d'un materiau pouvant secher sous uv WO2004039506A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003285027A AU2003285027A1 (en) 2002-10-28 2003-10-28 Can lid score repair with uv curable material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US42166302P 2002-10-28 2002-10-28
US60/421,663 2002-10-28

Publications (2)

Publication Number Publication Date
WO2004039506A2 true WO2004039506A2 (fr) 2004-05-13
WO2004039506A3 WO2004039506A3 (fr) 2004-11-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/034127 WO2004039506A2 (fr) 2002-10-28 2003-10-28 Reparation de la rainure d'un couvercle d'une boite de boisson au moyen d'un materiau pouvant secher sous uv

Country Status (2)

Country Link
AU (1) AU2003285027A1 (fr)
WO (1) WO2004039506A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005011880A1 (fr) * 2003-07-28 2005-02-10 Valspar Sourcing, Inc. Recipients metalliques presentant une extremite facile a ouvrir, et procede de fabrication des recipients

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726711A (en) * 1970-09-28 1973-04-10 Nordson Corp Method and apparatus for coating metal can bodies
US3819403A (en) * 1970-09-28 1974-06-25 Nordson Corp Method and apparatus for applying wax to can ends
US3852095A (en) * 1970-09-28 1974-12-03 Nordson Corp Method and apparatus for applying wax to can lid rims
US4378386A (en) * 1981-11-09 1983-03-29 Nordson Corporation Method of spraying closed end cans
EP0776146A2 (fr) * 1990-11-30 1997-05-28 Nordson Corporation Séchoir à induction et séparateur magnétique
EP1358947A1 (fr) * 2002-04-30 2003-11-05 Valeo Vision Procédé d'application d'un vernis comprenant un solvant ou non sur une pièce, notamment un réflecteur de projecteur de véhicule

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726711A (en) * 1970-09-28 1973-04-10 Nordson Corp Method and apparatus for coating metal can bodies
US3819403A (en) * 1970-09-28 1974-06-25 Nordson Corp Method and apparatus for applying wax to can ends
US3852095A (en) * 1970-09-28 1974-12-03 Nordson Corp Method and apparatus for applying wax to can lid rims
US4378386A (en) * 1981-11-09 1983-03-29 Nordson Corporation Method of spraying closed end cans
EP0776146A2 (fr) * 1990-11-30 1997-05-28 Nordson Corporation Séchoir à induction et séparateur magnétique
EP1358947A1 (fr) * 2002-04-30 2003-11-05 Valeo Vision Procédé d'application d'un vernis comprenant un solvant ou non sur une pièce, notamment un réflecteur de projecteur de véhicule

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005011880A1 (fr) * 2003-07-28 2005-02-10 Valspar Sourcing, Inc. Recipients metalliques presentant une extremite facile a ouvrir, et procede de fabrication des recipients

Also Published As

Publication number Publication date
AU2003285027A1 (en) 2004-05-25
WO2004039506A3 (fr) 2004-11-04
AU2003285027A8 (en) 2004-05-25

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