Classifications

• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
  • C03C17/001—General methods for coating; Devices therefor
  • C03C17/003—General methods for coating; Devices therefor for hollow ware, e.g. containers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
  • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
  • B24C1/04—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
  • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
  • B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
  • B24C1/086—Descaling; Removing coating films
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
  • B24C11/00—Selection of abrasive materials or additives for abrasive blasts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
  • B24C3/00—Abrasive blasting machines or devices; Plants
  • B24C3/08—Abrasive blasting machines or devices; Plants essentially adapted for abrasive blasting of travelling stock or travelling workpieces
  • B24C3/10—Abrasive blasting machines or devices; Plants essentially adapted for abrasive blasting of travelling stock or travelling workpieces for treating external surfaces
  • B24C3/12—Apparatus using nozzles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
  • B24C3/00—Abrasive blasting machines or devices; Plants
  • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
  • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
  • B24C9/006—Treatment of used abrasive material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B44—DECORATIVE ARTS
  • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
  • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
  • B44C1/22—Removing surface-material, e.g. by engraving, by etching
  • B44C1/221—Removing surface-material, e.g. by engraving, by etching using streams of abrasive particles
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
  • C03C17/001—General methods for coating; Devices therefor
  • C03C17/003—General methods for coating; Devices therefor for hollow ware, e.g. containers
  • C03C17/005—Coating the outside
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C19/00—Surface treatment of glass, not in the form of fibres or filaments, by mechanical means
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C23/00—Other surface treatment of glass not in the form of fibres or filaments
  • C03C23/0075—Cleaning of glass
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2218/00—Methods for coating glass
  • C03C2218/30—Aspects of methods for coating glass not covered above
  • C03C2218/32—After-treatment
  • C03C2218/328—Partly or completely removing a coating

Definitions

• a method of treating a hollow glass article having a coating and an installation for carrying out the process is provided.
• the invention relates to a method for treating a hollow glass article having a coating. It also relates to a method of decorating such an article and an installation for implementing the treatment method.
• the fields of the food industry and the cosmetic industry have long used hollow glass articles, such as bottles to contain in particular liquids such as liquor or not, lotions, creams or perfumes.
• bottle here refers generically to glass containers such as jars, cups, carafes and bottles. It is common practice to apply impressions to such glass items to provide information and make decorations. Coatings are also applied to wide surfaces in order to impart particular functional properties or to modify the aesthetic appearance of the article. In the case of printing, screen printing, transfer techniques such as decal or pad printing are typically used. In the case of wide coatings, the material is deposited in thin film by spraying. In both cases, the coatings are composed for example by inks, paints or varnishes based on organic resins. The resins polymerize when applied to the bottle, for example by exposure to heat or ultraviolet radiation or after physical drying. Some resins are sensitive to both heat and ultraviolet radiation.
• the resins may be epoxy, acrylic or polyurethane.
• the coatings may also be inorganic, such as enamel.
• a coating is applied in the form of a paste containing the minerals in the form of frit and an organic binder. After passing through an oven, the binder is calcined and the minerals bind and form the enamel on the surface of the article.
• compositions containing organometallic pastes with metals in cationic form are used.
• the composition is deposited on the surface of the article and a reduction of the cations takes place, which then take on a metallic form.
• This process is particularly applicable to gold, silver or alloys of these metals or other metals.
• US 2,490,399 shows an example of such a technique.
• a technique of applying a flexible adhesive mask on the article before applying the coating The mask is removed after applying the coating, leaving the surface of the article that is protected by the mask intact.
• the mask must, however, withstand the constraints during the polymerization operation of the resins of the coating, for example thermal stresses for heat polymerization.
• the removal operation of the mask is delicate and essentially manual.
• the liner is torn and may be peeled off at the periphery of the mask upon removal, resulting in a serrated aspect separation.
• the technique is limited to developable surfaces, given the constraints of application of the mask, and is unsuitable for fine decorations, such as texts that require the multiplication of masks to be deposited and removed and whose access is very difficult .
• a technique of depositing the resin by spraying through a mask having openings and placed in front of the article has also been used.
• the resin is deposited only on the locations facing the openings.
• the quality of the coating is difficult to control. Indeed, it is important that the space between the mask and the article is very small, so as not to allow lacquer or varnish in the form of droplets to penetrate behind the mask. These droplets would eventually be deposited on the surface of the article to remain free of lacquer or varnish and thus form a more or less important veil.
• the surface of glass vials has a significant geometric dispersion from one article to another. If one refers to manufacturing standards of glass vials, one can find, for example, tolerances of ⁇ 1.4 mm over a diameter.
• the coating is extracted locally by sublimation and pyrolysis carried out by exposure to laser radiation, for example of the ultraviolet type.
• the surface to be released from the coating is scanned by the laser beam.
• This method has a duration of implementation proportional to the surface to be treated, and uses lasers whose power is limited, which can lead to very long processing times.
• the effectiveness depends on the ability of the coating to absorb radiation. It does not apply to all coatings, and on the same article some parts may not be treated because of the nature of the different coating, especially its pigmentation. If the localization of the focusing of the laser beam is not sufficiently well controlled, and that it is performed on the surface of the glass, the process degrades the surface of the article. This control is far from being acquired for the bottles, whose dimensional dispersion has already been mentioned above. It will also be noted that the sublimation and pyrolysis of the coating generates gaseous compounds whose treatment must be provided.
• the glass articles generally receive a hot surface treatment which consists of depositing a thin layer of tin oxide or titanium on the outer surface of the articles. This layer is intended to reinforce mechanically the article, including its resistance to internal pressure in the case of bottles, and ensure the durable adhesion of cold protection treatments.
• the aim of the invention is to provide a process for decorating glass articles making it possible to obtain coated zones and bare zones, with a frank and reproducible delineation between them and whose implementation is simple while limiting the disadvantages mentioned above. . It is another object of the invention to provide a method of treating glass articles to avoid destroying and recycling articles when the synthetic coating is unsatisfactory.
• the subject of the invention is a method for treating a hollow glass article comprising a coating, characterized in that a flow of abrasive formed of organic solid particles is projected against the article to remove at least partially the coating.
• the abrasive particles are of plant origin.
• these particles are hard enough to attack the coating, but sufficiently flexible to preserve the surface of the glass article.
• the specific geometry of the particles has an influence on the efficiency of the process, in particular by the presence of angular edges created by the fracture of the particles.
• particles are renewable and do not exploit finite resources. Moreover, their disposal does not involve any environmental risk.
• the abrasive is, for example, made of a material chosen from a polysaccharide, in particular vitrified starch, or crushed fruit shells. The tests showed that these materials made it possible to obtain the expected results.
• vitrified corn starch particles sold under the name ENVIROSTRIP XL (registered trademark) by the company AD have been used satisfactorily.
• EP 396 226 A2 describes this kind of particles.
• the coating of the article is organic.
• This type of coating is less resistant than glass and its possible hot surface treatment and is well defined relative to the support. It is therefore possible to easily remove this coating and expose the glass without leaving traces of the said coating.
• the coating is a lacquer, a lacquer or an ink, made of acrylic, polyurethane or epoxy material, and with physical drying, with thermal polymerization or by exposure to ultraviolet rays, or alternatively with mixed polymerization.
• the coating may ultimately have a glossy, satin or smooth appearance. It may include components to give it effects colored, pearlescent or metallized by the dispersion of particles, usually aluminum.
• the coating may also be of metallized appearance by deposition of thin layers under vacuum or by projection of redox solutions, as described in document FR 2 934 609 A1.
• the varnish or the lacquer is water-soluble, which limits the use and atmospheric emission of volatile organic compounds.
• the coating may have been applied in one or more layers of the same material, of different materials but of the same nature or material of different natures, typically of a thickness of the order of 10 to 25 ⁇ per layer. It is found that the removal of the coating is faster when it is more flexible.
• the glass article has a coating underlying the first coating and greater strength and is removed at least partially the first coating to expose the underlying coating.
• the underlying coating being stronger, it is not removed by the projection of the abrasive.
• the underlying coating may be a mineral base decoration, which is generally harder than an organic coating, or also a stronger organic coating, for example obtained with a composition cured by ultraviolet rays. It can also be a metallic decoration.
• the treatment is the decoration of a glass article, wherein a coating is applied to the article, a treatment is carried out as described above, a mask being interposed between the article and the flow of abrasive to preserve the coating behind the mask and to remove it elsewhere. Special decorative effects can thus be obtained. It can be seen that such a method makes it possible to obtain precise and clean separations between the coated zones and the bare zones. It is therefore possible to delimit zones in a precise manner, whatever the shape of the surface of the article. These areas are for example windows preserving the transparency of the glass while the rest of the surface is rendered opaque or translucent by the coating.
• the mask is for example metallic, steel, aluminum or zamak. It can be rigid and placed a short distance from the article, or flexible to be pressed against the article and to marry its shape. The life of such a mask is very important because the abrasive has virtually no effect on the mask and is not subject to specific cleaning operations.
• the article has an underlying coating
• the underlying coating may for example be a metal coating by baking organometallic pastes. It is thus possible to easily combine lacquered portions of decor and metal portions. Indeed, in the prior art, the metal coating must be made before the synthetic coating, for thermal stresses. This combination is therefore constrained by the difficulty of applying organic coatings limited to certain areas. Thanks to the invention, the metal coating can be applied broadly and initially covered by the synthetic coating, for example opaque, and then discovered in a second time on certain areas by the removal of the synthetic coating.
• This technique can also advantageously replace a hot-marking technique in which a thin metal layer is deposited by transfer onto an organic lacquer or varnish. It also applies by producing an underlying metallized coating by thin film deposition, as mentioned above.
• the glass article comprises frosted surfaces before the application of a colored coating at least on a portion of said surfaces, the coating being then removed at least on a portion of the frosted surfaces.
• the glass article has a smooth surface, and the coating has a satin appearance.
• the organic coating of satin appearance is interrupted in places and leaves some areas as originally, that is to say, smooth and transparent. These smooth zones correspond to zones protected against attack of acid according to the prior art.
• the method according to the invention makes it possible to obtain an effect similar to that of the prior art while dispensing with the use of chemicals which are dangerous for health and which are not very respectful of the environment. It also allows to obtain other effects not previously accessible.
• a satin varnish can be given a color while having a perfectly transparent window, without tint, or with another color.
• the treatment method may also be a method of cleaning a glass article, wherein the article has a coating and the entire coating is removed. It is found that an article having an appearance and surface properties similar to those it had before the application of the coating. A new application of the coating can be undertaken directly, without special surface preparation, and this without affecting the quality of the coating in terms of appearance, feel or chemical resistance. Yes defects are found in the application of the coating, we can resume the article and reintroduce it into the production line and thus dispense with destroying the article. This applies in particular when the article already has an underlying coating as defined above.
• a particle spray nozzle is supplied with air with a pressure of between 1.5 and 3.5 bar; the pressure is a function of a compromise between the speed of execution of the process and the risk of obtaining traces of impact of the particles on the surface; in the case of the decorating process, the boundary between bare and coated areas is better defined when the air supply pressure is lower; below a certain threshold, the abrasive is no longer effective;
• the flow of abrasive is oriented relative to the surface of the article by an angle of between 60 and 90 °, preferably between 75 and 90 °; it can be seen that when the flow is inclined with respect to the surface, the pickling of the coating is well obtained, but in the case of an abrasive consisting of starch in vitreous form, traces of starch may remain on the surface of the coating. article, which requires cleaning before further operations; in the case of the decorating process, the boundary between the bare and coated areas is clearer when the abrasive flow attack is perpendicular to the surface; moreover, the shape of the exposed area corresponds better to the geometry of the opening of the mask;
• a nozzle outlet for the particle flow is located at a distance from the surface of the article of between 20 and 250 mm, preferably between 80 and 120 mm;
• the granulometry of the abrasive is such that 90% of the particles have a size of between 200 and 850 ⁇ ; the fine particles do not have enough energy to abrade the coating, while the larger ones may impact the glass surface; in the case of the decorating process, the large particles generate edges of the coating of less good definition;
• the flow of abrasive has an intensity of between 25 and 300 kg / m 2 / s at the outlet of the nozzle; this intensity range makes it possible to obtain satisfactory results.
• the subject of the invention is also an apparatus for treating a hollow glass article comprising means for gripping the article, characterized in that it comprises abrasive feed means in the form of solid particles and means projecting a flow of said abrasive against the glass article, the feeding means comprising a system for recovering the abrasive after spraying for recycling in the process, the recovery system comprising a filtration device for eliminating the The coarsest and finest particles, the feed system having a dispensing device for providing new abrasive to compensate for the material removed by the filtration device.
• the abrasive can thus be used several times, which limits the generation of waste by the process.
• the finest particles come from fragmentation of the particles during the impact on the surface of the article and on the tools in the flow of the abrasive. They are no longer effective and their regular replacement helps preserve the effectiveness of the abrasive stock.
• the large elements do not correspond mainly to particles originally present and are essentially fragments removed from the coating. It is therefore useful to eliminate them.
• the quality of the abrasive stock is stabilized continuously and continuously, which avoids or limits the stop operations which would have the object of completely replacing the abrasive.
• the recovery system comprises a balance for weighing the material removed by the filtering device, the dispensing device being controlled in addition to the information provided by the balance.
• the overall mass of the abrasive circulating in the installation is substantially kept constant continuously.
• the installation according to the invention further comprises a dedusting station of the article.
• the article is likely to retain dust particles. It may be useful to eliminate them before continuing operations in the production chain.
• the dedusting can also relate to tools such as gripping means and masks. This operation can be performed by brushing and / or blowing compressed air.
• the projection means comprise at least one nozzle and allow relative movement of the nozzle and the article during the projection operation of the abrasive.
• the nozzle can be animated with translation and rotation movements so that the flow of material is well oriented relative to the surface of the article, in particular in terms of direction and in terms of distance. However the movement can be communicated to the article. It can also be a combination of nozzle movements and the article. The latter can for example be driven around an axis of revolution while the nozzle moves parallel to this axis to cover the entire length of the article.
• Figure 1 is a schematic view of a glassware processing plant according to the invention
• Figures 2 to 6 are schematic views showing the successive steps of the processing method according to a first embodiment of the invention
• FIG. 7 is a view similar to FIG. 4 according to a second embodiment of the method according to the invention.
• Figure 8 is a sectional view of an article being processed.
• FIG. 1 An installation for implementing the process according to the invention for treating glass hollow articles is shown in FIG. 1.
• Such an installation comprises several stations placed side by side and in which the glass articles pass successively.
• the installation comprises a pickling station 1 in which abrasive in the form of solid particles is sprayed against the article 2 which is in said pickling station 1.
• the pickling station 1 comprises a hopper 10 to harvest the abrasive after projection.
• the pickling station 1 is followed by a dedusting station 3 in which the glass article 2 is moved after its passage in the stripping station 1.
• the dedusting station 3 also comprises a hopper 30 for recovering the rest of the particles. abrasive detached from the glass article 2 by the dedusting operation.
• the installation further comprises feed means 4 for supplying the abrasive to the pickling station 1 and a recovery system 5 for recycling the abrasive after the projection thereof.
• the recovery system 5 comprises in particular the hoppers 10, 30 of the stations 1, 3. The cycle of the abrasive from the pickling station 1 will now be described.
• the recovery system 5 further comprises a filtration system 50 to which the abrasive recovered in the stripping stations and dedusting is transferred. Then the abrasive is transferred to the feed means 4, in particular to a storage system 40. It is then sent again to the pickling station 1. The dust thus harvested is sent to a tank of rejected material 504 and weighed by a scale 5040.
• An extraction unit 51 also allows to put the stations in depression and avoid the spread of dust in the workshop. It also makes it possible to drive the abrasive towards the filtration system 50.
• the filtration system retains the larger particles, which are sent continuously to a tank of rejected material 504. It also retains the finest particles, which are also sent to the tank of rejected material 504. The abrasive retained, of intermediate granulometry between the finest and coarsest particles, is sent to the storage system 40.
• the feed means 4 comprise the storage system 40 and a drive chamber 41 in which the abrasive is mixed with compressed air to be transported to the projection means 42 in the pickling station 1.
• the supplying the chamber with compressed air comprises an adjustment valve 44 and a flow meter 43 in order to reproducibly adjust the compressed air flow rate.
• the system of storage is connected to the drive chamber 41 by a metering valve 407 to adjust the flow of abrasive transferred to the chamber 41.
• a valve is for example a valve type "Accuflow" (TM) provided by "Pauli Systems Inc. ".
• the feed means 4 further comprise a dispensing device 43 for supplying new abrasive A in compensation for the material removed by the filtration device.
• This dispensing device 43 comprises a silo equipped with a controlled valve and which discharges the new abrasive into the hopper 30 of the dedusting station 3.
• the abrasive dose A is controlled according to the mass of rejected material determined by balance 5040 as material is rejected.
• a level 406 detection system in the storage system 40 also avoids excess or lack of abrasives.
• the projection means comprise at least one nozzle 42 and allow relative movement of the nozzle and the article 2 during the projection operation of the abrasive, in a manner known to those skilled in the art.
• a loading station 0 is provided upstream of the stripping station 1.
• the loading station 9 comprises gripping means of the article 2 in the form of a clamp 90 for taking the article 2 glass, such as a bottle, each jaw of the clamp 90 being a metal mask 901 wrapping the shape of the article 2 in glass.
• the clamp also comprises closure means 902 of the bottle 2, in order to preserve the interior thereof against the penetration of abrasive particles.
• the masks 901 are interchangeable so as to adapt the installation to the treatment of different models of article 2.
• the gripping means 90 are intended to move towards the pickling station 1, once the article 2 gripped by closing the clamp 90, as shown in Figure 3, so as to place the article 2 in front of the projection means 42.
• the clamp 90 is rotated in front of the projection means 42, while the latter move slowly to completely scan the surface to be treated, as shown in FIG. 4.
• Each mask 901 has openings 9010 through which the flow of particles passes to reach the surface of the glass article 2.
• a space can also be provided between the masks 901, this space playing the same role as an opening 9010.
• the nozzle 42 can be animated with translation movements along one, two or three axes of displacement. It can also be animated with rotational movements along one, two or three axes. The choice of the number of axes of movement depends on the shape of the article 2, that of the abrasive flow F and the distribution of the openings 9010.
• the flow of abrasive is stopped and the clamp 90 is moved to the dedusting station 3, in which the glass article 2 is cleaned by brushes 31 and / or blowers 32 with compressed air, as shown in FIG. the passage in the dedusting station 3, the clamp 90 is opened and the article 2 is discharged in an unloading station 6, as shown in Figure 6.
• the clamp 90 can start a cycle again.
• the installation is configured as a carousel, in which the stations 9, 1, 3, 6 are arranged around a circle.
• One of the stations 9 is the loading point of the clamp 90 with the articles 2, the last being the unloading point 7.
• the articles 2 are transferred step by step from one station to another.
• the transfer is carried out at a constant and continuous speed.
• other configurations that those in carousel are also possible, such as a closed-chain layout. Loading and unloading can be manual or automatic.
• the articles 2 are placed on a conveyor 8 which moves them and supports them between the different stations.
• the operation of the movement is discontinuous, that is, the articles 2 are moved stepwise to the position where they are processed.
• the stripping station 1 ' as shown in FIG. 7, the masks 11 are moved opposite the article 2, then the abrasive flux F is projected through the openings 110 of the masks 11.
• the other operations are similar to those according to the first embodiment, except that it may not be necessary to unload the conveyor 8.
• Figure 8 shows an article 2 being processed according to the method of the invention.
• the surface 20 of the article 2 comprises a coating 21 applied in a previous step.
• a metal mask 901 having an opening 9010 is placed in front of the surface 20.
• a flux F of abrasive is sent substantially perpendicular to the surface 20.
• One part Fl of the flow is stopped by the mask 901, while the other part F2 of the Flux reaches the surface 20 and exposes the glass.
• the article comprises an underlying coating 22, on which the first coating 21 is made.
• the underlying coating 22 is of greater hardness than the first coating 21.
• the first coating 21 is kept behind the mask 901, but it is etched opposite the opening 9010, so as to reveal the underlying coating 22.
• the gripping means do not comprise any mask and the entire outer surface of the article is treated, so as to completely strip the coating.
• the glass article is a cylindrical bottle with an original smooth surface. It is coated on its entire outer surface with a single layer of a water-based clear acrylic satin dry varnish, in a thickness of between 15 and 25 ⁇ .
• the abrasive used consists of vitrified starch particles sold under the name "ENVIROSTRIP XL" by the company ADM.
• a nozzle was used having an exit section of 10 x 100 mm.
• a mask is placed on a tool for rotating the bottle around its axis of revolution. The mask is placed against the item and is set in motion with the item. The nozzle is fixed at 80 mm from the surface of the article and sends a stream of abrasive perpendicular to the surface of the article.
• the flow of abrasive is sent through an air pressure supplying the nozzle to 2 bars.
• the opening of the dosing valve is low (about a quarter opening).
• An area of about 110 cm 2 is etched in 5 seconds. It is estimated that the flow of abrasive at the exit of the nozzle is 40 kg / m 2 / s and that 18 kg / m 2 of abrasive must be sprayed.
• This test differs from the previous test in that the article is a bottle of square section, that the nozzle is maneuvered manually and that the varnish is satin and colored.
• the flow of abrasive is sent thanks to an air pressure supplying the nozzle at 3 bars.
• the dosing valve is set at medium opening, ie halfway.
• An area of about 128 cm 2 is etched in 3.5 seconds. It is estimated that the flow of abrasive at the outlet of the nozzle is 80 kg / m 2 / s and that 21 kg / m 2 of abrasive must be sprayed.
• the glass article is a conical bottle with a smooth original surface. It has an underlying gold coating. It is coated on its entire outer surface with a single layer of an opaque acrylic black lacquer dry paint dilutable with water, in a thickness between 15 and 25 ⁇ .
• the abrasive used is the same as above.
• the nozzle used has a circular outlet section of diameter 20 mm. A mask is placed against the article. The nozzle is manually manceuved at a distance between 100 and 200 mm from the surface of the article and sends a stream of abrasive perpendicular to the surface of the article.
• the flow of abrasive is sent through an air pressure supplying the nozzle to 2 bars.
• the opening of the dosing valve is low (about a quarter opening). It is estimated that the flow of abrasive at the exit of the nozzle is 125 kg / m / s.
• This example differs from Example 3 in that the bottle is cylindrical, the underlying coating is enamel and that the coating is formed of two layers, an acrylic blue opaque glossy dry lacquer dilutable to the water and a colorless varnish of the same nature, for a total thickness of 30 to 50 ⁇ .
• the air pressure is 2.5 bar and the opening of the metering valve is average. It is estimated that the flow of abrasive at the outlet of the nozzle is 250 kg / m 2 / s.
• the glass article is a conical bottle with a smooth original surface. It has an underlying coating made by screen printing with an ultraviolet curing ink. It is coated on its entire outer surface with a first layer of a water-dilutable acrylic black satin dry lacquer, and a second layer of a colorless pearlescent varnish of the same kind, for a total thickness of between 30. and 50 ⁇ .
• the abrasive used is the same as above.
• the nozzle used has an exit section of 10 x 100 mm. The nozzle is fixed 100 mm from the surface of the article which is rotated about its axis of revolution. The nozzle sends a stream of abrasive perpendicular to the surface of the article.
• the flow of abrasive is sent thanks to an air pressure supplying the nozzle at 2.5 bars.
• the opening of the dosing valve is average. It is estimated that the flow of abrasive at the outlet of the nozzle is 80 kg / m 2 / s.
• the glass article is a cylindrical bottle with a smooth surface of origin having undergone a treatment hot. It comprises a coating made by screen printing with a polymerization ink on the one hand thermal and on the other hand with ultraviolet in three layers, for a total thickness of between 10 and 20 ⁇ .
• the abrasive used is the same as above.
• the nozzle used has an exit section of 10 x 100 mm. The nozzle is fixed 100 mm from the surface of the article which is rotated about its axis of revolution. The nozzle sends a stream of abrasive perpendicular to the surface of the article.
• the flow of abrasive is sent thanks to an air pressure supplying the nozzle at 3 bars.
• the opening of the dosing valve is average.
• An area of approximately 265 cm 2 is etched in 45 seconds. It is estimated that the flow of abrasive at the outlet of the nozzle is 80 kg / m 2 / s and 132 kg / m 2 of abrasive must be sprayed to obtain the etching.
• Results the etched surface of the article is not deteriorated.
• the surface analysis shows that the heat treatment is fully preserved.
• a new silkscreen decoration is applied without any problem of quality, in particular concerning the adhesion of the new decoration.
• the glass article is a conical bottle with a smooth original surface. It is coated on its entire outer surface with a single layer of a colorless dry acrylic varnish dilutable with water, in thickness between 15 and 25 ⁇ .
• the abrasive used is composed of crushed walnut shell particles.
• the nozzle used has an exit section of 10 x 100 mm. The nozzle is fixed 100 mm from the surface of the article which is rotated about its axis of revolution. The nozzle sends a stream of abrasive perpendicular to the surface of the article.
• the flow of abrasive is sent thanks to a pressure air supplying the nozzle to 2 bars.
• the opening of the dosing valve is average.
• An area of about 235 cm 2 is etched in 5 seconds. It is estimated that the flow of abrasive at the exit of the nozzle is 80 kg / m 2 / s and that 17 kg / m 2 of abrasive must be sprayed to obtain the stripping.
• the invention is not limited to the embodiments which have been presented solely by way of example.
• the nozzle can be implemented manually or fully automatically.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Surface Treatment Of Glass (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=44651861

Family Applications (1)

Country Status (4)

Families Citing this family (3)

Family Cites Families (9)

• 2011
  • 2011-07-29 CA CA2842149A patent/CA2842149A1/fr not_active Abandoned
  • 2011-07-29 WO PCT/FR2011/000451 patent/WO2013017739A1/fr active Application Filing
  • 2011-07-29 EP EP11757356.8A patent/EP2736858A1/de not_active Withdrawn
  • 2011-07-29 US US14/235,117 patent/US20140193582A1/en not_active Abandoned

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events