WO2003072265A1 - Procede et dispositif d'application de revetements sur des recipients - Google Patents

Procede et dispositif d'application de revetements sur des recipients Download PDF

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Publication number
WO2003072265A1
WO2003072265A1 PCT/EP2003/002096 EP0302096W WO03072265A1 WO 2003072265 A1 WO2003072265 A1 WO 2003072265A1 EP 0302096 W EP0302096 W EP 0302096W WO 03072265 A1 WO03072265 A1 WO 03072265A1
Authority
WO
WIPO (PCT)
Prior art keywords
containers
coating
station
conveying device
continuous conveying
Prior art date
Application number
PCT/EP2003/002096
Other languages
English (en)
Inventor
Matteo Zoppas
Andrea Saran
Alberto Armellin
Marco Leonardi
Original Assignee
S.I.P.A. Societa' Industrializzazione Progettazione Automazione S.P.A.
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 S.I.P.A. Societa' Industrializzazione Progettazione Automazione S.P.A. filed Critical S.I.P.A. Societa' Industrializzazione Progettazione Automazione S.P.A.
Priority to AU2003212287A priority Critical patent/AU2003212287A1/en
Publication of WO2003072265A1 publication Critical patent/WO2003072265A1/fr

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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
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/0221—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling

Definitions

  • This invention relates to a device for coating plastic containers. More particularly, it relates to coating, for example, PET bottles made through blow moulding.
  • Prior art relates to a device for coating plastic containers. More particularly, it relates to coating, for example, PET bottles made through blow moulding.
  • the coating plants can be of very different sizes, also depending on the productive capacity of the plant that can vary from hundreds to several thousands of bottles per hour.
  • Today, these plants are highly automated; they comprise a station for loading the containers to be painted, a coating station, and a paint reticulation station, for example, equipped with furnaces suitable for the type of paint used in the process.
  • containers are moved from one station to another by means of conveyor chains equipped with gripping devices, especially the so-called chucks, or on conveyor belts.
  • These plants generally suffer from contamination caused by different soiling agents - such as dust, particles of lubricant, or airborne particles - that can adhere to the surface of the container or bottle when the paint is still fresh, compromising the quality and the uniformity of the paint.
  • Another problem that arises in coating plants concerns adaptation: adapting to different types of processes that can be necessary when the plant uses coating products with different properties, or adapting the production of the coating plant to the different productive capacities of the container blow-moulding plants, which supply containers to the coating plants directly or after storage.
  • a coating plant for containers for containers, especially plastic bottles, suitable to carry out a coating process involving many processing stations that carry out the different phases of said coating process.
  • Said plant features a first continuous container-conveying device equipped with several gripping elements suitable to secure reversibly said containers.
  • Said first continuous conveying device is apt to feed said containers to be coated through at least one of said many processing stations. Several of said processing stations are positioned on a first level while others are positioned on a second level above said first level.
  • the plant can be adapted to the most different production needs, for example, ranging from 6000 bottles per hour to 36000 bottles per hour. It is possible to increase the number of paint reticulation or drying furnaces without redesigning the plant and without large structural interventions, maintaining almost unaltered the surface occupied by the plant.
  • - Fig. 1 shows ⁇ block diagram of a coating process implemented by means of a coating plant in accordance with the invention
  • - Fig. 2 shows a schematic three-dimensional view of a coating plant in accordance with the preferred variant of the invention
  • - Fig. 3 shows a plan view of a first part of the plant of Fig. 2
  • - Fig. 4 shows a plan view of a second part of the plant of Fig. 2;
  • Fig. 5 shows a plan view of a particular variant of the plant of the invention.
  • Fig. 1 shows a schematic view of a coating process of plastic containers such as, but not exclusively, PET bottles.
  • paint or coating are used indifferently for the purpose of the invention. Said process comprises the phases described below.
  • the containers are made by a known type of blow- moulding plant, not described in this description, and are transported by means of a known type of conveyor to a loading station of the coating plant of the invention.
  • This coating plant feeds the bottles at the appropriate feed rate through a pre- treatment station where the bottles are treated, for example, by subjecting them to a stream of deionized air in order to eliminate any residual electric charges, dust, etc. that deposit on the external surface of containers in PET, PP, HDPE, etc.
  • the means of transport are a part of a first conveying circuit of closed-ring type.
  • the next phase involves subjecting the bottles to an electric charge in an electric field, for example of approximately 100kV, in order to charge the bottles with an appropriate electric charge. Then, the bottles are forwarded to the next phase, which takes place in the coating station.
  • Coating can be carried out preferably through spray coating; however, other coating processes can also be used whenever these are suitable for the particular product chosen to coat the bottles.
  • the bottles are transferred from the first conveying circuit to a second conveying circuit that moves the bottles to a flash-off area for a predetermined amount of time, normally ranging from a few seconds to 60 seconds and over, which depends on the used type of paint or product. Then, the bottles are fed through a furnace or set of furnaces of reticulation for an amount of time that also varies according to the used type of paint.
  • a particular coating product, marketed as Bairocade®, for PET bottles requires a reticulation time that varies between 5 to 15 minutes at a temperature of approximately 60°C- 70°C.
  • a preferred version, according to an essential aspect of the invention, of a coating plant 1 is used, which is shown schematically in Figures 2 through 5.
  • the different stations of the plant 1 are arranged on two over-and-under levels, are appropriately oriented, and are reciprocally placed in order to achieve maximum efficiency and cost effectiveness in terms of the operation of the whole plant 1.
  • This plant comprises, at the lower level, a station 2 for loading the bottles, which is supplied by a bottle-making machine or an appropriate system.
  • This station is served by a continuous chain conveyor 3, or other similar system, for transporting the bottles that moves in the direction shown by the arrow 4; the bottles to be painted are placed on the chain and fastened by means several fastening supports.
  • the plant 1 also includes a pretreatment station 5, followed by, in the feeding direction of the conveyor chain 3, a spray-coating station 6 where the paint is applied, for example but not necessarily, by means of spray nozzles. Coating can also be carried out by immersing the containers in dip tanks, or by flow coating. However, other coating processes can also be used depending on the desired results.
  • the plant Upon exiting the coating station 6, the plant includes a station 7 for changing the conveyor chains. Using a wheel 8 system, the just-painted bottles are transferred from the gripping devices of the chain 3 to a second chain 9, which is also equipped with bottle-gripping devices.
  • the first chain 3 freed from the bottles is immediately fed through a cleaning station 10 where the paint residues can be removed when no paint reticulation has taken place.
  • the cleaning station is thus simpler to design and to run, since it is not necessary to clean dry paint but only still-fresh residues. This decreases the running costs of the plant.
  • the cleaning station 10 is preferably positioned on the same level of the spraying station 6.
  • the conveyor chain 3, after passing through the cleaning station returns to the loading station 2 where other bottles to be painted are loaded continuously.
  • the second chain 9, after having gripped the painted bottles, passes through a solvent-evaporating station 11 , also called flash-off station, of the known type.
  • this station is made up of a pressure and room-temperature chamber where the bottles are kept for the time required by the vector of the paint, normally a solvent or water if the product is water based, to evaporate adequately in order to complete the next phases of the process optimally.
  • This step avoids, for example, the formation of bubbles during the next passage through the furnace; furthermore, the paint could need a certain time to cover the surface homogeneously.
  • the flash-off station 11 is preferably placed on the same level as the coating station 6.
  • the chain 9 rises to the next level of the plant.
  • the conveyor chain 9 feeds the bottles through the drying stations located on the higher level.
  • these stations are hot-air or infrared or other type of reticulation furnaces apt to dry the particular paint used in the process.
  • a pre-heating station 12 formed by an infrared furnace, which brings the bottles to the required reticulation temperature, and by one or more hot-air furnaces 13' to 13' v , which maintain the bottles at the right temperature for the time necessary for the paint to reticulate or dry.
  • the bottles are transported to the unloading station 13, placed on the lower level of the plant, where they are removed by the gripping devices and sent, on other conveyors, to the next processing stations, packing, etc.
  • the flash-off station 11 is placed on a higher level and, thus, the chain 9 rises at the exit of the transferring station 7.
  • the first conveyor chain 3 only serves the wet area of the coating plant, meaning the part where the paint is not yet in a reticulation phase
  • the second chain 9 conveys the bottles only in the dry part of the plant, meaning the one where the paint has started to dry and/or reticulate.
  • the bottle- gripping devices of the chain 9 can be designed with a less complex structure because they are not subject to the action of the paint; this leads to significant cost savings. Since the wet area of the plant 1 is smaller than the dry area, the chain 3 is shorter than the chain 9, and, thus, requires fewer bottle-gripping devices attached to the chain, leading to additional savings in terms of investment.
  • the bottles to be painted are fed through segments of the plant 1 , for example through the coating station 6, hung on the conveyor chain 3, meaning below the line of movement of the chain to which they are fastened by their open end.
  • the same bottles are positioned upside down with their end open, by which they are attached to the gripping devices of the respective chain, placed below, meaning the bottles above the line of movement of the chain.
  • the segments where the bottles travel in the upside down position include the drying station 12. In this way, the body 13 of the conveyor chain 1 does not get dirty with drops of paint that fall on the painted bottles in the segment of chain immediately after coating, or does not get dirty with paint in the coating station.
  • the chain can also be lubricated inside the furnaces where the need for lubrication is greater and, thus, the risk of lubricant contamination is usually greater since the higher temperature of the furnace makes the lubricant less viscous and more fluid.
  • the plant 1 is also equipped with other stations accessory to the main coating process, in particular: a station 14 for conditioning air able to handle considerable airflows, a station 15 for storing and preparing paint, and a station for removing the sediment 16 from the water for disposing of the used solvents and paints, meaning not deposited on the containers during spraying, the so-called overspray.
  • stations accessory to the main coating process in particular: a station 14 for conditioning air able to handle considerable airflows, a station 15 for storing and preparing paint, and a station for removing the sediment 16 from the water for disposing of the used solvents and paints, meaning not deposited on the containers during spraying, the so-called overspray.

Landscapes

  • Spray Control Apparatus (AREA)

Abstract

La présente invention concerne un atelier (1) d'application de revêtements sur des bouteilles en plastique. Cet atelier, qui réunit de nombreux postes correspondant aux différentes opérations du processus d'application des revêtements, comporte deux chaînes continues distinctes (3, 9) faisant passer les bouteilles par les différents postes. Ces postes sont situés sur deux niveaux. Des carrousels de transfert font passer les bouteilles d'une chaîne à l'autre. Les fours de réticulation sont au niveau supérieur.
PCT/EP2003/002096 2002-02-28 2003-02-28 Procede et dispositif d'application de revetements sur des recipients WO2003072265A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003212287A AU2003212287A1 (en) 2002-02-28 2003-02-28 A device and method for coating containers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2002RM000110A ITRM20020110A1 (it) 2002-02-28 2002-02-28 Dispositivo e metodo di verniciatura di contenitori.
ITRM2002A000110 2002-02-28

Publications (1)

Publication Number Publication Date
WO2003072265A1 true WO2003072265A1 (fr) 2003-09-04

Family

ID=11456121

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2003/002096 WO2003072265A1 (fr) 2002-02-28 2003-02-28 Procede et dispositif d'application de revetements sur des recipients

Country Status (3)

Country Link
AU (1) AU2003212287A1 (fr)
IT (1) ITRM20020110A1 (fr)
WO (1) WO2003072265A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007135147A1 (fr) * 2006-05-24 2007-11-29 S.I.P.A. Societa Industrializzazione Progettazione E Automazione S.P.A. Système de revêtement de contenant et procédé
US7678304B2 (en) 2004-03-30 2010-03-16 S.I.P.A. Societa Industrializzazione Progettazione E. Automazione S.P.A. Apparatus for blow moulding of plastic objects
US7700029B2 (en) 2004-03-02 2010-04-20 S.I.P.A. Societa Industrializzazione Progettazione E Automazione S.P.A. Device and method for conditioning plastic objects

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB588611A (en) * 1943-07-14 1947-05-29 Crown Cork & Seal Co Improvements in apparatus for handling and coating containers
EP0192617A2 (fr) * 1985-02-18 1986-08-27 Sebastiano Bernacchioni Cabine de pulvérisation continue comportant une station de séchage
US5215130A (en) * 1989-06-30 1993-06-01 Hisao Kojima Liquid-mixture auto-applying apparatus
US5285801A (en) * 1991-08-24 1994-02-15 Krones Ag Hermann Kronseder Maschinenfabrik Machine for the cleaning of bottles or the like
EP0858841A2 (fr) * 1996-12-23 1998-08-19 Daniel Seiler Unité de revêtement par poudre, bande transporteuse pour une telle unité et installation munie de cette unité
GB2323069A (en) * 1997-03-10 1998-09-16 Patrick Mccormick Conveying apparatus for use in the deposition of paints

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB588611A (en) * 1943-07-14 1947-05-29 Crown Cork & Seal Co Improvements in apparatus for handling and coating containers
EP0192617A2 (fr) * 1985-02-18 1986-08-27 Sebastiano Bernacchioni Cabine de pulvérisation continue comportant une station de séchage
US5215130A (en) * 1989-06-30 1993-06-01 Hisao Kojima Liquid-mixture auto-applying apparatus
US5285801A (en) * 1991-08-24 1994-02-15 Krones Ag Hermann Kronseder Maschinenfabrik Machine for the cleaning of bottles or the like
EP0858841A2 (fr) * 1996-12-23 1998-08-19 Daniel Seiler Unité de revêtement par poudre, bande transporteuse pour une telle unité et installation munie de cette unité
GB2323069A (en) * 1997-03-10 1998-09-16 Patrick Mccormick Conveying apparatus for use in the deposition of paints

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7700029B2 (en) 2004-03-02 2010-04-20 S.I.P.A. Societa Industrializzazione Progettazione E Automazione S.P.A. Device and method for conditioning plastic objects
US7678304B2 (en) 2004-03-30 2010-03-16 S.I.P.A. Societa Industrializzazione Progettazione E. Automazione S.P.A. Apparatus for blow moulding of plastic objects
WO2007135147A1 (fr) * 2006-05-24 2007-11-29 S.I.P.A. Societa Industrializzazione Progettazione E Automazione S.P.A. Système de revêtement de contenant et procédé
US9188385B2 (en) 2006-05-24 2015-11-17 S.I.P.A. Società Industrializzazione Progettazione E Automazione S.P.A. Container coating system and process

Also Published As

Publication number Publication date
ITRM20020110A0 (it) 2002-02-28
AU2003212287A1 (en) 2003-09-09
ITRM20020110A1 (it) 2003-08-28

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