DISPOSABLE LINING FOR PAINTING CONTAINERS V METHOD FOR USING IT BACKGROUND OF THE INVENTION When painting with a manual spray gun, the paint can be supplied from a bucket containing it and mounted on the gun, or from a paint bucket ae connects are the spray gun by means of a hose. Commonly, when the bucket is attached to the wheel, it sucks the paint into the gun. As the atomizing air circulates through a nozzle assembly it creates a reduced pressure that causes the paint to be extracted from the bucket and carried to the nozzle, where it is discharged and atomized by the action of the circulating air. Although it is possible to make an adjustment between the speed of the atomizer air circulation and the speed of the flow of the fluid, the velocity of the latter is limited, since the suction caused by the flow of the fluid is a function of the speed of air circulation atomizer. Consequently, in certain applications the flexibility of the operator to use the gun can be limited. In some spray paints it is possible to pressurize an attached paint bucket, in order to provide a positive introduction of pressure paint in the spray nozzle, which is particularly useful when it comes to atomizing more viscous materials. Blow guns with attached paint buckets are relatively easy to clean after painting, or when pB and dUB change the color of the paint. However, these pistols suffer from some disadvantages. Since the cuvette is attached to the gun during use, the operator sees the need to support the relatively large weight of the cuvette and the paint it contains in the course of atomization. If the operator is painting objects that require a large volume of paint, or painting for a very long time, the extra weight may cause the painter to tire very soon and possibly fatigue his wrist. An alternative to using a paint bucket attached with -7 to use a remote pressure bucket, which is connected to a manual spray gun by means of a hose that supplies the paint to the gun with pressure. The cuvette can be designed so that it is held in the free hand of the operator; or, that is hooked, for example, on a ladder rung. In these applications, the length of the hose that carries the paint can be only 1 or 2 meters. Alternatively, a longer hose can be used that connects the distant tank with the spray gun, and the paint tank is placed on the ground. However, longer hoses need a greater amount of solvent to clean them during a paint change. These atomizing guns can be better reconciled with those who use them, since they reduce the weight that the operator has to bear in the course of atomization, and because the paint bucket can be sized so that it has a greater volume of painting. Likewise, some controls that are applied to the pressure of introduction of the paint in the remote tank and to the circulation of the atomizing air, impart a maximum flexibility to the finishing applications of the atomization. A disadvantage of the remotely pressed paint bucket is the amount of solvent and additional labor required to clean the paint bucket and the hose connecting it, during a paint change or when finishing paint. SUMMARY OF THE INVENTION The invention relates to a disposable liner for paint buckets located at a distance from the work; also, it relates to a method for applying the liner to a paint bucket, which has a lid or cover that is attached to the cuvette by means of a threaded ring that engages with complementary threads carved into a rim of the cuvette, or by means of a conventional clamping device. The liner includes a disposable bag that is initially inserted into the paint bucket with an open end extending therefrom, and that is bent over the upper end of the bucket to protect the flange and the threads thereof while filling. . Next, a convenient volume of paint is poured into the bucket bag, and a disposable lid is placed over the top of the bucket. The disposable lid fits perfectly on the rim of the paint tray, and has a radial fin extending over the open end of the tray rim. The open end of the bag is folded inward over the peripheral edge of the disposable lid, and this is attached to the bowl. The lid and the bag were so disposed that they are held between the tray and the lid of the tray, to prevent the paint from falling between the lid and the disposable bag. While the lid is placed on the tray, a paint feeder tube is inserted, pushing it through an airtight fit opening in the disposable lid so that the tube extends to be adjacent to the bottom of the bag contained in the tray. painting. Optionally, a ring can be inserted in a slot made in the disposable lid, in order to keep the open end of the disposable bag away from the threads of the bowl, while the lid is attached to the bowl. The disposable lid includes, at least, a ventilation opening to facilitate the passage of air between the paint contained in the liner of the tray and the space between the disposable lid and the lid of the paint tray. Thus, when pressurized air is supplied to the interior of the paint bucket, through a passage made in the lid of the bucket, the air circulates towards the forair to favor the entrance of the pressure, in order to supply of paint to the atomizing paint. After painting with the paint contained in the bucket, the lid of the bucket is removed, removing the paint feeder tube from the liner IB cover. The cover of the liner establishes with the paint feeder tube a sufficiently tight fit to remove the paint remaining on the outside of the tube, as it is removed from the disposable lid. If it is convenient, the air pressure can be applied to the nozzle of the spray gun, in order to purge any remaining paint in the puddle and in the connection hose, so that it goes back inside the lining, so that it can be easily removed together with the disposable liner. Both the latter and any other paint can be detached from the paint bucket and easily disposed of. For example, the liner can be placed in a plastic bag, which is sealed with a ziper to achieve a non-voiding elimination. It suffices to clean the pipe feeder pipe located in the lid of the bucket, as well as the passages for the paint, arranged in the hose alimeptadora of painting and in the spray gun. Optionally, a disposable paint feeder tube, which remains in place along with the disposable liner and lid, can be attached to the paint tray lid when the paint tray lid is removed from the tray. The disposable liner of the paint bucket has the advantage of reducing labor, as well as the costs involved in the cleaning solvent and the waste operation, when the bucket is cleaned in order to carry out a color change, or to make another change in the type of painting that is atomizing, and when the painting work is finished. Accordingly, an object of the invention is to provide a disposable liner for paint bucket, and to offer a method for using the disposable liner of the paint bucket. Other objectives and advantages of the iiti / encidp will become evident from the following detailed description of the invention., and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a side path of a portable pressured paint container of the prior art, suitable for use with a disposable liner manufactured in accordance with the invention. Figure 2 is a cross-sectional view of the lower portion of the open-pit bowl, of the container illustrated in Figure 1, which shows an inserted liner bag. Figure 3 is a cross-sectional view of the paint bucket shown in Figure 2, to which a certain volume of paint has been incorporated. The figure is a cross-sectional view of the paint bucket seen in Figure 3, with a liner cover placed over the paint bucket. Figure 5 is a cross-sectional view of the paint bucket shown in Figure k, which shows the lining bag folded over the lining tqpa, and a ring inserted into a lining lid section. , in order to protect the open end of the lining bag and FIG. 6 is a cross-sectional view of the paint tray shown in FIG. 5, provided with an upper assembly, in a fragmentary partial view, subject to the in-ture bucket. DETAILED DESCRIPTION OF THE INVENTION Referring first of all to Figure 1 of the drawings, there is illustrated a BUbetB commercial assembly of pressurized paint 10. This assembly 10 includes a paint bucket 11 and a lid 12 attached to the cuvette 11 by means of a retaining ring 13, roughened therein to be coupled with a threaded flange on its outside lk, worked on the paint bucket so that the lid of the cuvette 12 is fixed to the cuvette 11, in removable form. The paint bucket assembly 10 is constructed so that it can sit on the floor during use, or be held in the free hand of the painter, or hang from any available support. In the illustrated paint bucket assembly 10, the lid 12 has a yoke 15 which serves to support the paint bucket assembly 10. An accessory 16, consisting of a hose for conducting the air, is mounted on the handle 15 to connect with a conventional source of pressurized air (not shown). The pressurized air circulates from the fitting 16, passes through a manually adjustable pressure adjusting valve, and is introduced into the interior of the paint bucket 11. The air pressure exerted on the paint bucket 11 makes the paint flow through a paint conductive hose 18, and into a conventional hand-operated spray gun (not shown). The passages for the pre-sionized air, worked in the handle 15, can also be connected with a safety valve against overpressure 19, and with a pressure gauge ip-indicator 20. Both the valve 19 and the pressure gauge 20 are arranged downstream of the valve 17. A manual ventilation device of the paint bucket 21 is installed in the lid 12 to relieve the pressure that is inside the paint bucket 11, in order to facilitate that the lid 12 can be removed from the the paint bucket 11. A hook (shown in a fragmentary view) can be attached to the lid 12 so that, during atomization, the paint bucket assembly 10 can be hung from any useable support, eg: a ladder rung. Similarly, the paint bucket 11 is provided with a flat bottom 23 which allows said assembly 10 to stand on any available flat surface, for example, the floor or a work table. In order to minimize the amount of solvent needed to clean during a paint change, or when the paint runs out, the hose carrying paint 16 should only have the required length. If the paint bucket assembly 10 has to be held by hand while the painting work is being carried out, the hose lß must be only 1 to 2 meters long, but it will have to be considerably longer if the paint bucket is to be placed on the floor during use. According to the invention, a disposable liner is installed in the paint tray during atomization. When the atomization ends with a certain paint, the disposable liner is detached from the paint bucket and removed. The pressurized air can, directed towards the paint bucket 11, can be suspended and the fan from the paint bucket 21 opened so that the bucket is vented to the atmosphere, before removing the lid 12. Optionally, it is possible to apply the pressure from the air to the nozzle of the spray gun in order to blow the paint that has remained on the wheel and the hose that carries the paint l ?, so that the rest of the paint goes back to the disposable liner installed in the paint bucket 11. This paint is then removed together with the removable liner. If appropriate, the lining and any remaining paint remaining in it, are confined, to be disposed of, in a plastic bag that has a ziper closure, in order to prevent the paint from spilling. Figures 2 to 6 illustrate the disposable liner of the paint tray and its use. Said liner includes a disposable bag 26 which is made of a thin, flexible and solvent tolerant material, such as polyethylene or a high density polyethylene (HOPE). The material that is actually used to make the bag 26 can vary according to the diaollants that are used in particular in the coating material that is installed in the bag 26. As shown in FIG. 2, the ball 28 is inserted, in an initial stage, through an end opening 29 made in the paint tray 11, and penetrates into an interior cavity 30 of the trough 11. The end opening 29 is delimited by the rim of the paint tray lk. In the cavity 30 a part of the disposable bag 26 is placed, sufficient to allow it to expand to encompass the size of the cavity 30. The disposable ball 28 is large enough to provide an open end 31 extending from the open end of the bag. the paint bucket 29. The disposable bag 28 may have a rectangular configuration when flattened, or adopt a shape that more closely matches the configuration of the cavity of the paint bucket 30 and the open end 29 of this bucket. The open end of the bag 31 is then folded outwards and downwards, on the rim of the paint tray 1. In this position, the open end of the ball 31 protects the flange of the paint bucket l "against possible contamination with the paint, when the bucket 11 is full. Figure 3 shows the paint bucket 11 and the attached disposable bag 26 after a volume of paint 32 has been poured into the disposable bag 28. Refer to figure k, there is shown a disposable lid 33 placed on the rim of the 1U paint bucket. Together, the bag 28 and the cap 33, both disposable, form the disposable liner 3í ». The disposable bag 28 extends radially outwardly, between the lip of the paint cuvette l »and a radial rim 35 of the disposable lid 33. Preferably, the disposable lid 33 has a slotted portion 36 that extends slightly toward the cavity. of the bucket; of paint 30, and intimately engages with the interior of the flange 1 < +, so that the disposable lid 33 is placed over the lip ". The disposable cap 33, illustrated, has, in its slotted portion 36, an opening 37 for a paint feeder tube 38 (shown only in FIG. 6) to pass through and, in addition, can have a central slot 39, in FIG. which forms a ventilation opening kO. If this aperture is located at or near the center of the undesirable cover 33, the risk of the paint leaking is minimized if the paint bucket assembly 10 is tilted. However, since the paint bucket assembly 10 is not tilted or attached to a spray gun, there is little danger of leakage through IDS vent holes carved into the disposable lid 33. Instead of there being only one central ventilation opening kO, there may be multiple openings around the disposable lid 33, at a radial distance from the center. Returning to FIG. 5, the open end 31 of the disposable liner bag 28 engages inwardly on the rim of the disposable lid 35. Optionally, an insertion ring Ul can be pushed into the slot 36, so that the open end of the bag 31 is kept in the bent inward position. The insertion ring kl may be of circular cross section or, as shown, may have a generally flat interior surface ** 2. This surface U contributes to pick up the insertion ring < + l. It is preferable that the insertion ring Ul be adjusted smoothly, and not that it be press fit in the grooved part 36, in order to facilitate insertion and removal of the insertion ring Ul. The latter functions so that the open end of the bag 31a keeps away from the threads of the lip of the paint bucket 1 < +, when the retaining ring 13 is secured to the threaded flange of the paint bucket Ik,
Figure 6 shows the lid of the paint bucket 12 attached to the bucket 11 to complete the assembly of the paint bucket 10. As the lid 12 moves towards the bucket 11, the paint alimotating tube 38 is pushed to through the abe? The disposable lid 37. Preferably, the socket that is established between the opening of the disposable lid 37 and the paint feeder tube 36 should be sufficiently tight to prevent paint from leaking between these parts. After the cap of the paint bucket 12 is placed over the bucket 11, the retaining ring 13 is secured to the threaded flange 1U to seal the paint bucket 11. The open end 31 of the disposable bag 26 is wound around the flange of the disposable lid 35, and is clamped between the lip of the paint basin 1 and an elastic closure Wi disposed on the lid of the paint basin 12. Thus, a seal is formed between the disposable bag 26 and the disposable lid 33. As, through the lid of the paint bucket 12, the air pressure ae supplies the space between the lid of the paint bucket 12 and the disposable lid 33, it is free to circulate through the vent opening Uii, to force the paint 32 to flow towards the spray gun, passing through the paint feeder tube 36. If the paint pan 11 is emptied during use and an additional amount of paint is required, the lid of the bucket 12 can Removed from the bucket 11. While the paint feeder tube is removed from the opening of the disposable lid 37, the outer surface of the tube 36 is cleaned to prevent runoff. If the free open end 31 of the disposable liner bag 26 is pulled, the insertion ring Ul jumps out of the groove 36. Then, the open end of the bag 31 bends outward, over the rim of the bag. paint bucket 14, the disposable lid 33 is removed from the paint bucket 11 and an additional volume of paint 32 is added to the disposable bag 28 located in the bucket 11. The paint bucket assembly 10 is then reassembled, as is described previously. When a particular paint has been finished, the paint bucket 11 can be vented to the atmosphere, and pressurized air can be used to force the return to the disposable bag 26 of any remaining paint left in the spray gun, the hose that carries the paint 16 and eit the paint feeder tube 38. The lid of the paint tray 12 is removed from the trough 11, the paint supply tube 36 is removed and the disposable liner 34 is removed. , the farro 34 and the remaining paint are deposited in a plastic bag (which is not shown), which is sealed with a ziper closure. Optionally, the paint feeder tube 38 can be made from an economical material and removed together with the disposable liner 34; it is only necessary to clean the paint passages carved in the spray gun, in the hose that conducts the paint 18 and in the lid of the paint bucket 12, with the consequent reduction of time, labor and solvent that is required to do the cleaning. As a further option, the hose that carries the paint 18 and the paint feeder tube 36 may be disposed so as to be disposed of as a unit with the disposable liner 34. As described, the paint tray assembly 10 is -t provided with a retaining ring 13 which serves to hold the lid 12 to the paint bucket 11. You can also use other conventional devices to secure the lid 12 to the bucket 11. For example, the threads cut into the flange of the bucket 14 paint can be replaced with two or more protruding pawls that engage with
the lid 12 by means of a known fastening mechanism. It must be observed