SYSTEM AND PROCEDURE FOR THE INNER PAINT JOB OF METALLIC CONTAINERS.

not limitativo in the attached designs, in which:

fig. the 1 fig. the 2 extension a raised schematic sight in lateral of the paint job system; and extension a magnified perspective schematic sight of the station of I heat to induzione.

With reference to the figures cited, comes shown a system 1 for the inner paint job of metallic containers 2, as an example bottles in aluminum for aerosol.

system 1 comprises a conveyor 3 for the movimentazione in succession of containers 2 along a distance of advance 4 (indicated from a dotted line) through at least a station 5 for the application of the varnish to 2 containers and at least a station 6 for the polymerization of the varnish applied to the containers 2.

Favorablly along the distance of advance 4 it is previewed, to mount of the station of polymerization 6, at least a station of I heat 7 with system of I heat to induction in order to activate a prepolymerization of the varnish when it comes applied to metallic containers 2 in such way that the varnish fixed to the containers 2.

the system of I heat comprises a generator of frequency 10 that feeds an inducer 8 that develops to Iongitudinalmente parallel and to ridosso of a waved-9 feature of the distance of advance 4. In particular inducer 8 is constituted from or more coils in quadrangular copper than form and square or rectangular or round cross section and introduces two or more Iongitudinali branches and parallels 40, 41 that reproduce the course of waved feature 9 of the distance of advance 4 in order to maintain themselves to a distança constant from it. A sheet 11 in material electrically insulator and to low coefficient of friction covers at least the longitudinal side slowly of turned inducer 8 towards the distance of advance 4. Such sheet of covering 11, as an example in Teflon, allows to maintain inducer 8 in possible the drawn near position more to containers 2 and in case of accidental contact besides the isolation electrical worker it makes that containers 2 can slip without to crawl and therefore without to damage same himself neither inducer 8. Inducer 8 at last preferibilmente introduces an inner channel 30 for the cooling water circulation. An appropriate adjustable support of famous type supports inducer 8 in such way that this can be posizionato always to ridosso of containers 2 independently from the Ioro forms and dimension. The generator of frequency 10 preferibilmente is action to interact with an unit of control of the production line for automatically modulating the output power in reason of the form and dimension of containers 2 and/or the speed of I heat wished and/or of the speed of advance of containers 2 along the advance distance 4.

conveyor 3 comprises a first convogliatore to seams 12 that is unfolded through the station of paint job 5 and the station of I heat to induction 7, a convogliatore to seams 13 to mount of the first convogliatore to seams 12 and a convogliatore to seams 14 to goes them of the convogliatore to seams 12.

convogliatore 13 is preplace to load containers 2 to deal to convogliatore 12 through a star 15 of the suitable type to capture and to release containers 2 through creation and removal of an empty one of aria.

convogliatore 14 is preplace to feeding containers 2 to the furnace of the station of polymerization 6 capturing them from convogliatore 12, after that they have been subjected to paint job and heats to induction, through a star 16 078 CH 700 A2 anch'essa of the suitable type to capture and to release containers 2 for effect of the creation and the removal of an empty one of aria.

the first convogliatore to seams 12 is bundled up around to rotates main 17 to greater beam, and secondary wheels 18, 19 and 20, 21 in such way that the distance of successive advance 4 comprises arch of circumference in which every arc of circumference it has different concavity from that one precedente.

Along part of the arc to greater beam of distance 4 of advance defined from it rotates main 17 are posizionati the nozzles sprayers 25 of the station of paint job 5, while inducer 8 is developed preferibilmente to goes them of this drawn along drawn remaining of arc defined from rotates main 17 and it arches long it of the defined distance of advance 4 from successive wheels 20 and 21 so that I heat to induction of containers 2 quickly begins after the Ioro paint job. Naturally he is parimenti conceivable that I heat to induction happens before also and/or during the paint job and in such long case a feature of the distance of advance 4 will carry out a concomitant action of paint job and heats of containers 2. In order to conform the paint job of the containers the 2 seams of the first convogliatore to seams 12 are motorized for being able to rotate around own axis during at least the passage in correspondence of the nozzles sprayers 25.

convogliatore first Al to seams 12 is associated to insertare and an extracting machine of famous type not mostrati.

the insertore is action to coaxially wear every container 2 which released from star 15 in a correspondent seam of the convogliatore to seams 12, while the extracting machine is action to parade container 2 from the correspondent seam of the convogliatore to seams 12 for being able it to release to the star 16.

the procedure of inner paint job of metallic containers 2 consists essentially in subjecting them to mount of the station of polymerization 6 to heats to suitable induction to activate a prepolymerization of the varnish in the moment in which the varnish it comes successively applied to metallic containers 2 in such way that the varnish can be fixed to containers 2, and in subjecting them to an ulterior heat treatment in the polymerization station with which it comes completed the polymerization of the vernice.

geometry of inducer 8 that offers a flat surface to ridosso of containers 2 determines a optimization of the exploitation of the output power of the frequency generator that comes employed without dispersion for heats homogenous and uniform of the containers for drawn extending of the advance distance 4.

the output power of the frequency generator favorablly as said it can be automatically modulated from the unit of control of the production line in reason of the form and dimension of the containers and/or the speeds of I heat demanded and/or of the speed of advance of containers 2. In a preferred realization of the invention the paint job in the station of paint job 6 is executed with varnish in powder that joins electrostatically to containers 2 before being to they fixed through heats to induzione.

In such realization the advantage is had to avoid the installation of groups of treatment of the emissioni.

This does not exclude a possible application in a system of paint job with liquid varnish, being in this case as precedence however in the event remarkable the advantages legacies to the consequent energetic saving to the necessity of a minor permanence of the containers in the polymerization furnace and to the structural simplifications of system tied to the resource to a system of heat to induction that maintains an elevated efficiency also in reduced spaces limiting the total length of the convogliatore to seams 12 that one today constitutes of the more complex and expensive members of the systems of inner paint job of containers in commercio.

the operation of the system second the invention appears obvious from described how much and illustrated and, in particular, it is substantially the seguente.

containers 2 are enlivened in succession long the distance of advance 4 through continuous synchronized drive to steps or of the convogliatori to rulli.

Every container 2 is subjected in succession to the following actions: it comes released from star 15 in correspondence of the section of income of the convogliatore to seams 12; it comes traslato along its axis from the insertore for being worn in a seam of the convogliatore to seams 12; it comes transported from the seam in which it is worn through the feature of arc of the distance of defined advance 4 from rotates main 17 in which the nozzles are present sprayers 25 where it is placed in spin on own axis for being uniform painted through axial introduction to its inside and successive axial extraction of the nozzles sprayers 25; it comes then made to be left over ulteriorly from the seam in which it is worn through the remaining part of the arc defined from rotates main 17 and through it arches to it successive of the distance of defined advance 4 from wheels 20 and 21 where inducer 8 for being heated in such way is present to make to prepolymerize the varnish; then it comes traslato along its axis from the extracting machine in opposite sense to the precedence for being paraded from the seam in which it is worn; and it comes captured from star 16 from which it is riposto on the convogliatore to seams 14 that I door to the polymerization furnace. Naturally the spin of the container on same himself can be extended also during its passage under inducer 8 for having also heats to extremely uniform induction. In the event in which the movimentazione of containers 2 or it continues and not to steps it is necessary that insertare, the extracting machine and the nozzles sprayers are capacities from respective supports in degree on one side to set in action them coaxially to containers 2 and from the other to move them also in the direction of the distance of advance 4 (that is orthogonal to the axial direction of the containers 2) in synchronized way with containers 2 in 078 CH 700 A2 such way that do not introduce during the Ioro coaxial drive to 2 containers a relative movement regarding these in the direction of long advance the distance of advance 4. The system and the procedure of paint job thus conceived are susceptible of numerous varying modifications and, all re-entering in the within of the inventive concept; moreover all the details are sostituibili from elements technically equivalenti.

[the 0026] Practically used materials, let alone the dimensions, could be any to second of the requirements and the state of the technique.