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EP0724914A1 - Méthode et appareil pour peindre en continu des éléments mobiles - Google Patents

Méthode et appareil pour peindre en continu des éléments mobiles Download PDF

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Publication number
EP0724914A1
EP0724914A1 EP96100672A EP96100672A EP0724914A1 EP 0724914 A1 EP0724914 A1 EP 0724914A1 EP 96100672 A EP96100672 A EP 96100672A EP 96100672 A EP96100672 A EP 96100672A EP 0724914 A1 EP0724914 A1 EP 0724914A1
Authority
EP
European Patent Office
Prior art keywords
paint
painted
painting
elements
brushes
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.)
Withdrawn
Application number
EP96100672A
Other languages
German (de)
English (en)
Inventor
Paolo Brocchi
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.)
DELLE VEDOVE IMPIANTI Srl
Original Assignee
DELLE VEDOVE IMPIANTI Srl
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 DELLE VEDOVE IMPIANTI Srl filed Critical DELLE VEDOVE IMPIANTI Srl
Publication of EP0724914A1 publication Critical patent/EP0724914A1/fr
Withdrawn legal-status Critical Current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
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • 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
    • B05B13/0207—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the work being an elongated body, e.g. wire or pipe
    • B05B13/0214—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the work being an elongated body, e.g. wire or pipe the liquid or other fluent material being applied to the whole periphery of the cross section of the elongated body
    • 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
    • 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
    • B05D3/12—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 mechanical means

Definitions

  • This invention concerns a method for the continuous painting of moving elements and the relative device, as set forth in the respective main claims.
  • This invention is applied advantageously to linear machines pre-arranged for the continuous painting of elements of a substantially rod-shaped type, such as strips for frames or other like elements.
  • the invention is especially suitable for the painting of strips of wood or other materials for frames, where the strips have a profile characterised by shapings, mouldings, steps, hollows, consecutive ridges and/or grooves.
  • the invention can be used also for the painting of plastic or metallic elements or elements consisting of any other like material.
  • the state of the art covers linear painting machines for the continuous painting of moving elements such as rods, strips, flat objects, frames, etc.
  • the normal painting machines include a conveyor belt which feeds the piece to be painted to one or more spraying assemblies positioned in sequence within a substantially closed painting chamber.
  • Each spraying assembly comprises a plurality of adjustably positionable spray guns able to deliver the paint over the whole periphery of the element to be painted.
  • the painting machines of the state of the art generally include aspiration means associated with filtration means positioned downstream.
  • the aspiration means aspirate the vapours of paint produced during the spraying step, while the filtration means separate the air from the component of paint so as to be able to discharge that air into the outside environment.
  • the paints normally used in the painting machines of the state of the art are of a type with a solvent and with a low component of dry residue.
  • These paints containing a solvent are characterised by requiring a long drying period after the application of the coat of paint on the element to be painted.
  • a drying oven is generally positioned downstream of the painting machine, and in this oven the elements leaving the painting process are stacked, held and left for a variable length of time according to the profile and the material of which the painted element consists and according to the type of paint, the finished quality of the product, etc.
  • a common drying process provides for the painted elements to be left in the furnace for about half an hour at a temperature of about 50 to 60°C.
  • the painted elements undergo a first drying at the ambient temperature for a determined period and then a completion of the drying inside the oven.
  • the coat of paint applied is dried downstream of the painting machine by being lapped by ultraviolet rays substantially without interrupting the forward movement of the painted element.
  • a further advantage is linked to the environmental factor inasmuch as these paints do not include an appreciable polluting component and therefore there is no need to use complex systems to abate the fumes.
  • a lack of paint in certain zones of the profile may lead, during the honing step, to almost complete removal of the paint and may therefore make it necessary to send the element back to the painting cycle after the honing step.
  • the paint is deposited and builds up in the structural pores and grains of the element, thus often forming bubbles and clots which the lack of even a minimum step of evaporation cannot eliminate.
  • the state of the art also covers a step of brushing the surface of the element to be painted as it leaves the painting chamber.
  • This brushing which is normally carried out by using brushes with a low speed of rotation, has the sole purpose of spreading the layer and bringing the paint to the points which the action of the spray guns has been unable to reach.
  • the present applicants have therefore set themselves the objective of obtaining a method and the relative device which enable photosensitive paints to be used with drying by means of ultraviolet rays, thus achieving the aforesaid working advantages without thereby entailing a decline of the quality of the finished product as compared to what can be achieved with conventional paints containing a solvent; for this purpose the applicants have designed, tested and embodied this invention.
  • the purpose of the invention is to obtain a painting method which is particularly, but not only, suitable for wooden elements of a rod-shaped type such as strips for frames or like elements, the method making possible the use of paints which can be dried with ultraviolet rays with a consequent high quality of the finished product.
  • the method is associated with means to convey and feed the rod-shaped elements to be painted, this feed being parallel to the longitudinal axis of the element.
  • the conveyor means can be conveyor belts, roller conveyors, conveyor elements on which are suspended weighing means or supporting means to hold the elements to be painted, etc.
  • Another purpose of the invention is to embody a continuous painting device which carries out this method.
  • the continuous painting device cooperates with feeder means by means of which the element to be painted is fed into a substantially closed box-shaped structure which acts as a painting chamber.
  • the device arranges that the rod-shaped elements to be painted cooperate with conveyors elements such as conveyor belts, roller conveyors, conveyor elements on which are suspended weighing means or supporting means to hold the elements to be painted, etc.
  • conveyors elements such as conveyor belts, roller conveyors, conveyor elements on which are suspended weighing means or supporting means to hold the elements to be painted, etc.
  • At least two spraying assemblies each of which comprises a plurality of spray guns delivering paint and variously oriented or orientable according to the conformation of the profile of the element to be painted, are contained within this closed box-shaped structure.
  • At least one assembly to remove, level and spread the first layer of paint applied to the element to be painted is included downstream of the first spraying assembly and upstream of at least one second spraying assembly.
  • the assembly to remove, level and spread the first layer comprises a plurality of rotary brushes positioned in cooperation with the periphery of the profile of the element to be painted being thus fed.
  • the first spraying assembly has the task of applying a first layer of paint to cover the desired surfaces of the element to be painted and of filling the structural pores and grains on that element.
  • the brushes of the removal, levelling and spreading assembly positioned downstream of the first spraying assembly have the primary task of removing all the excess paint from the element, both from the flat or substantially flat parts thereof and from its more marked structural grains.
  • the paint is left intentionally in the shallower pores and grains where the successive drying action of the ultraviolet rays is able to dry the paint in the required manner.
  • the brushes have also the secondary task of spreading uniformly the paint in a homogeneous manner substantially over the whole surface of the element to be painted.
  • a second layer of paint is then applied downstream of the removal, levelling and spreading assembly and, being deposited on a surface already covered in a homogeneous and even manner, is distributed evenly over the whole desired profile of the element.
  • a second removal, levelling and spreading assembly followed by a third spraying assembly is included downstream of the second spraying assembly.
  • the painting method according to the invention thus ensures a homogeneous spreading of the paint and enables a substantially even thickness of paint to be achieved over the whole surface and thus prevents the running and build up of paint involved in the methods according to the state of the arts.
  • This method thus enables paints to be used without a solvent and with a 100% dry residue, together with the working and environmental advantages arising therefrom.
  • the invention enables a substantially complete recovery to be obtained of the paint sprayed and not deposited on the element to be painted.
  • the removal, levelling and spreading assembly comprises assemblies of brushes positioned in cooperation with the sides to be painted of the rod-shaped element.
  • These brushes are adjustably positionable according to the conformation of the element to be painted.
  • the brushes carry out not only their specific task of removal, levelling and spreading of the layer of paint but also a task of longitudinal and lateral guiding of the element to be painted during the forward movement of the latter.
  • two brushes are included per each free side of the element to be painted.
  • each brush rotates in the opposite direction to the adjacent brush and to the opposed brush, this situation being applied at least where there are lateral brushes.
  • the brushes are rotated at a high peripheral speed, advantageously at least 4 metres per second, so as to perform an efficient action of removal of the layer of paint.
  • the brushes are associated with means for recovering and recirculating the removed paint; these means for recovering and recirculating removed paint, according to the invention, include circumferential casings positioned in cooperation with the periphery of the relative brush, these casings collecting the paint expelled from the brush by centrifugal force and being conformed to define a channel down which the paint can run.
  • this channel for the running paint is associated with means for the recovering and recirculation of the paint arriving by gravity.
  • the painting device comprises aspiration means associated with means to remove and separate the paint from the air, these latter means making possible a practically complete recovery of all the paint mixed with the air and not fixed to the element to be painted during the spraying step.
  • the painting device comprises also means to recover the paint falling from the element being painted and the paint deposited on the walls and floor of the painting chamber.
  • a continuous painting device 10 shown in Figs.2 and 3 cooperates in this case with a conveyor 11 advancing in the direction 12 and consisting of a powered roller conveyor comprising a plurality of rollers 13 advantageously made of stainless steel.
  • the direction 12 of advance is parallel to the longitudinal axis of an element 18 to be painted, which in this case is advantageously a substantially rod-shaped wooden element, such as a strip for a frame, for instance.
  • the painting device 10 in this case comprises a box-shaped structure 14, which has metallic walls and acts as a closed chamber for the painting operations.
  • the box-shaped structure 14 contains in sequence, in this case, a first spraying assembly 15, a removal, levelling and spreading assembly 16 and a second spraying assembly 17.
  • Each spraying assembly 15-17 includes a plurality of spray guns 19, which deliver paint and cooperate with the periphery of the profile of an element 18 to be painted (not shown in Fig.3 for the sake of simplicity of description).
  • These spray guns 19 can be oriented and be positioned automatically by a servo-mechanism according to the identification of the conformation of the element 18 to be painted.
  • the first spraying assembly 15 applies a first layer of paint to the surface of the element 18 to be painted (step 20, Fig.1).
  • This first layer of paint covers the element 18, fills its structural pores and grains and prepares the surface of the element 18 for the successive applications.
  • the element 18 to be painted undergoes, downstream of the first application 20, a step 21 of removal, levelling and spreading of the first layer of paint; this step 21 is performed by the removal, levelling and spreading assembly 16, which comprises in this case three pairs of brushes 25, each pair consisting of two brushes rotatable in the opposite direction to each other.
  • contrarotatable brushes 25a which cooperate from above with the element 18 to be painted
  • two pairs of contrarotatable brushes 25b which cooperate laterally, one per each side, with the element 18 to be painted.
  • These brushes 25 are driven by respective motors 26.
  • the action of the brushes 25 on the element 18 to be painted causes a removal of the excess paint, particularly from the deeper and higher grains, and leaves the element 18 to be painted substantially wetted by a very thin layer of paint spread in an even and homogeneous manner.
  • each brush 25 cooperates peripherally with a protective casing 27 which recovers the paint removed from the surface of the element 18; the casing 27 surrounds a substantial portion of the circumference of the relative brush 25 and includes in its lower part a conformation substantially such as that of a gutter 28.
  • This gutter-shaped conformation 28 is advantageously inclined upstream and has its ends associated with means that recover the paint, such as the small tubes referenced with 29 in Fig.5.
  • These small tubes 29 convey the recovered paint towards suitable collection means, from which the paint is re-fed, after possible filtration and purification treatments, to the spray guns 19.
  • a second spraying assembly 17 having a conformation substantially analogous to that of the first spraying assembly 15 is included in this case downstream of the removal, levelling and spreading assembly 16.
  • the second spraying assembly 17 has the task of applying 22 a second layer of paint to the element 18 to be painted.
  • This second layer of paint is applied to a surface wetted in a substantially homogeneous and even manner, thus forming a substantially continuous and constant thickness without dripping, build-ups or surfaces lacking paint.
  • the element 18 leaving this second application of paint 22 is subjected to an in-line drying step 23 with the application of ultraviolet rays.
  • a second step of removal, levelling and spreading 21 is carried out downstream of the second spraying assembly 17 and is followed by at least one third application 24 of a layer of paint and then by a drying step 23.
  • the painting device 10 comprises aspiration means performing a re-circulation of air and a recovery of the paint sprayed within the painting chamber.
  • the aspiration means comprise a first aspiration pipe 30, the intake 31 of which is associated with a collection vessel 32 positioned substantially below the spray guns 19 in the spraying assemblies 15-17.
  • the air mixed with paint is aspirated by the action of a motor 33, which drives a fan 34, and the air is delivered into a separation cyclone 35, within which a substantial separation of the air from the paint takes place.
  • This separation is induced by making the aspirated air (referenced with 36), carry out a substantially helicoidal path, which causes an intense flapping action that leads to separation of the paint from the air.
  • the air separated from the paint is conveyed into a column 37, whence the flow of air is discharged through a second pipe 38 and filtered in a collector 39, which makes possible a recovery of the residues of paint still mixed with the air.
  • a part of the flow of air is first filtered by a filter 40 and is then re-delivered into the painting chamber through a third pipe 41.
  • the painting device 10 can be associated with other filtration methods, such as those, for instance, which provide a dry filtration by expansion of the current of air and a consequent variation of the speed.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • Transmission Devices (AREA)
  • Spray Control Apparatus (AREA)
EP96100672A 1995-01-31 1996-01-18 Méthode et appareil pour peindre en continu des éléments mobiles Withdrawn EP0724914A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD950011 1995-01-31
IT95UD000011A IT1280119B1 (it) 1995-01-31 1995-01-31 Procedimento di verniciatura in continuo di elementi in movimento e relativo dispositivo

Publications (1)

Publication Number Publication Date
EP0724914A1 true EP0724914A1 (fr) 1996-08-07

Family

ID=11421713

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96100672A Withdrawn EP0724914A1 (fr) 1995-01-31 1996-01-18 Méthode et appareil pour peindre en continu des éléments mobiles

Country Status (2)

Country Link
EP (1) EP0724914A1 (fr)
IT (1) IT1280119B1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003099461A1 (fr) * 2002-05-23 2003-12-04 Delle Vedove Levigatrici Spa Appareil et procede pour peindre des objets tels que des profiles, des panneaux ou analogues
NL1029274C2 (nl) * 2005-06-17 2006-12-19 Trespa Int Bv Werkwijze voor het aanbrengen van een laag op een drager, alsmede een samenstel.
CN111992474A (zh) * 2020-08-11 2020-11-27 中国人民解放军海军工程大学 一种小通径直管或异形金属管路内壁防腐涂料全涂覆方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111229509B (zh) * 2020-03-31 2021-09-21 翟如扬 一种圆柱金属喷漆设备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2971856A (en) * 1957-03-08 1961-02-14 Minnesota & Ontario Paper Co Surface decorated fiberboard and method of making the same
JPS62195582A (ja) * 1986-02-22 1987-08-28 Rhythm Watch Co Ltd 時計外枠の製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2971856A (en) * 1957-03-08 1961-02-14 Minnesota & Ontario Paper Co Surface decorated fiberboard and method of making the same
JPS62195582A (ja) * 1986-02-22 1987-08-28 Rhythm Watch Co Ltd 時計外枠の製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 048 (P - 666) 13 February 1988 (1988-02-13) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003099461A1 (fr) * 2002-05-23 2003-12-04 Delle Vedove Levigatrici Spa Appareil et procede pour peindre des objets tels que des profiles, des panneaux ou analogues
NL1029274C2 (nl) * 2005-06-17 2006-12-19 Trespa Int Bv Werkwijze voor het aanbrengen van een laag op een drager, alsmede een samenstel.
WO2006135234A1 (fr) * 2005-06-17 2006-12-21 Trespa International B.V. Procede d'application de couche sur une surface, ensemble et panneau decoratif
CN111992474A (zh) * 2020-08-11 2020-11-27 中国人民解放军海军工程大学 一种小通径直管或异形金属管路内壁防腐涂料全涂覆方法

Also Published As

Publication number Publication date
ITUD950011A0 (it) 1995-01-31
IT1280119B1 (it) 1998-01-05
ITUD950011A1 (it) 1996-07-31

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