INTERNAL PAINTING METHOD
The method addresses non-homogeneous paint application and flaking in glass containers by preheating, synchronized nozzle rotation, and controlled drying, achieving a homogeneous layer suitable for storage and diverse recipes.
Patent Information
- Authority / Receiving Office
- FR · FR
- Patent Type
- Patents
- Current Assignee / Owner
- WHEATON PINTURA E BENEFICIAMENTO DE VIDROS LTDA
- Filing Date
- 2022-12-15
- Publication Date
- 2026-06-12
AI Technical Summary
Current methods for applying paint inside glass containers for the perfume and cosmetics market result in non-homogeneous application, flaking, and bubbling, and are either expensive due to the use of specialized lacquers or require immediate heat drying, making storage impossible.
A method involving preheating glass bottles, using synchronized nozzle movement with bottle rotation, applying paint with ionized air to stabilize the surface, and controlled drying to achieve a homogeneous paint layer, allowing storage and multiple recipes.
Ensures a homogeneous paint application with reduced flaking and bubbling, enabling storage and supporting up to 100 different paint recipes, while using cost-effective materials and room temperature drying.
Abstract
Description
Title of the invention: INTERNAL PAINTING METHOD Scope of the invention
[0001] The present invention relates to a method for internally painting glass packaging for the perfume and cosmetics market. Description of the prior art
[0002] Various methods of applying paint inside containers are known from current techniques. However, with current paint systems and inputs, it is not possible to properly apply the paint to the inner cavity of the bottle, because the application is not homogeneous and the paint suffers from flaking and bubbling.
[0003] Document BR 11 2015 029160 relates to a method for coating the inside of a container that comprises rotating the container about its imaginary vertical axis while simultaneously lowering airless spray nozzles along the vertical axis of the container into the cavity through the opening end and then retracting the nozzles upwards and out of the container. The spray nozzles are used to apply a liquid coating at a spray pressure of approximately 100 to approximately 800 psi (6.89 to 55.16 bar) and at an angle of approximately 0 to approximately 120 degrees to the vertical axis, simultaneously with the movement of the nozzles, to at least a portion of the internal surface while the container rotates and the nozzles move along the vertical axis. The container is thus coated on its internal surface to form a container with an internal coating.However, patent BR 11 2015 029160 relates to coatings on plastic containers and uses edible oil as a coating instead of paint. Furthermore, the present invention uses a fixed rotation with a change of direction (i.e., it can be clockwise or counterclockwise) for the painting, unlike patent BR 11 2015 029160. The application of the coating in patent BR 11 2015 029160 is carried out immediately before filling the product, which makes it impossible to store the coated bottle and differs from the claimed painting method.
[0004] In patent document PI 0408013, a method for decorating a transparent or translucent glass or plastic bottle, intended for the cosmetics industry, for containing a liquid such as perfume, or any other similar liquid, is characterized in that the decoration is carried out inside the bottle. The method consists of applying at least one layer of lacquer to the internal surface of the bottle by spraying a mist in powder or liquid form inside the bottle. Patent document PI 0408013 uses powdered lacquer as a coating, which makes the method expensive because the lacquer requires special preparation before application. Furthermore, the process requires heat drying immediately after painting, unlike the claimed process in which drying is carried out at room temperature. In addition, the invention of the present patent application does not use superimposed layers with laser removal between them.
[0005] IP document 0905637-8 is intended for the cosmetics sector, for use in containers for cosmetic products such as perfumes or similar liquids, in which the decoration is carried out inside the bottle. This decoration consists, at a minimum, of applying a coating to the internal surface of the bottle by spraying a mist of liquid inside the bottle. The liquid is chemically inert and has characteristics similar to those of glass, so that the internal coating forms a protective barrier to shield the cosmetic product from any migration that could be harmful to its fragrance and / or color, as well as its preservation. However, IP document 0905637-8 primarily aims to protect the coating itself. Objectives of the invention
[0006] The objective of the present invention is to solve the disadvantages of the current technique, by proposing a painting method which decorates by means of a coating in the internal cavity of glass packaging for the perfumery and cosmetics market.
[0007] With the internal painting method, it is possible to carry out the application with the nozzle of a gun directly inserted into the bottle, in addition to the synchronized movement of the needle of the gun with the rotation of the bottle, allowing a better homogeneity of the paint layer, capable of carrying out four paints at the same time and of storing up to 100 different recipes, depending on each type of bottle, serving a range of configurations. Detailed description of the invention
[0008] The invention relates to a method of applying paint to the inner part of glass packaging intended for the perfumery and cosmetics market.
[0009] The method of the present invention comprises the following steps: 1) Insert the vials into a heating system (oven / incubator / infrared oven); 2) Heat the flasks; 3) Position the heated bottles in the painting equipment; 4) Blow heated ionized air inside the bottles; 5) Apply the paint inside the bottles; 6) Vacuum the gases generated by the paint and the paint remaining in suspension, better known by the Anglo-Saxon expression "overspray"; 7) Insert the bottles into the drying oven; 8) Drying the bottles.
[0010] The bottles must be preheated in a heating system, maintaining the surface to be painted at a temperature of 30°C to 45°C, so that the paint does not run during its application.
[0011] The vials pass through a system with 4 nozzles of ionized air heated from 50°C to 70°C, where air is blown inside the vials to eliminate moisture and internal impurities and, in addition, to help stabilize the heating which was carried out in the previous step.
[0012] Internal painting is carried out with the spray gun nozzle inserted directly into the bottle, with the movement of the nozzle synchronized with the bottle's rotation, ensuring a homogeneous layer of paint. At this stage, it is possible to apply the paint layer to four bottles simultaneously, it being understood that the programmed formula in the equipment will determine the number of sprays, the bottle rotation, and the depth to which the nozzle advances within the bottle to apply the paint, depending on the bottle model.
[0013] The paint guns spray at a pressure and atomization of 6 bars, it being understood that said method uses two types of guns and three types of rods, where each rod has a type of directed spray, with spray jets of two conical formats and one straight.
[0014] After painting, air nozzles are introduced into the bottles, which perform the aspiration of the gases generated by the paint in contact with the hot surface of the bottle, and the aspiration of the overspray resulting from the paint suspended inside the bottle.
[0015] The final step is drying the bottles, and this drying must be carried out according to the type of paint used. The drying process for organic or inorganic paints is carried out in continuous convection ovens, with heating by direct or indirect combustion, or even by electric heating elements. Each type of pigment (color) requires a specific oven configuration.
[0016] In the case of an inorganic paint, drying requires a special curve, of temperature as a function of time because this drying process generates many gases, and in order to minimize the generation of these gases, the transit time in the drying tunnel should preferably be 240 minutes, in an oven with 6 heating zones, starting with the first zone at 100°C and ending at 640°C.
[0017] Organic paint requires a lower drying temperature than the previous one, specifically between 180 and 200°C with a tunnel drying time of approximately 50 minutes; however, it is necessary to apply a protective varnish to this paint or to use a plastic container called a "bag," which has the following functions: 1) Prevent the coating from releasing substances that could migrate into the product, alter its characteristics such as odor, color or even, in the worst case, cause injury to the end user. 2) It maintains the visual characteristics by preventing the coating from flaking off after contact with the perfume.
[0018] The painting equipment has a system of four ionized and heated air nozzles, which blow air inside the bottle, removing moisture and impurities and stabilizing the heating of the bottle surface.
[0019] Preferably, the equipment can store up to 100 recipes, each recipe having the capacity to store 10 parameters per recipe, these parameters being the fundamental elements for the execution of the painting. The main parameters are the height of the bottle, the start and end of the painting, the depth to which the rod penetrates the bottle, the number of sprays, and the rotation of the bottle.
[0020] In addition to the parameters mentioned above, we can also individually control the pressure and atomization of each of the four guns, and it is also possible to adjust the rotation and rotation speed of the tray. The equipment is also divided into 3 stages, which will be described below: 1) The equipment operates via a platform with a total of 24 pins divided into sets of 4 pins, where the devices that hold the glass bottles are attached. Since the bottles are already preheated, the first step before painting is carried out by 4 nozzles of hot, ionized air that enter the bottle to remove internal moisture and help stabilize the bottle's heating. 2) In the second stage, the platform rotates to the next station where 4 bottles will be painted simultaneously. This is the point in the machine where the formula determines the number of sprays, the bottle rotation, and the height and depth to which the nozzle will enter the bottle to apply the paint. 3) In the third and final step, air nozzles are introduced into the bottles to draw in and extract the gases generated by the paint, resulting from contact with the hot surface and the overspray, which are suspended inside the bottle.
[0021] The equipment, in order to meet the specifications and quality of the internal painting method, preferably uses two types of spray guns with three types of nozzles, each used for a given type of bottle to be decorated.
[0022] The first type of gun has a special adjustment that allows for the adjustment of the spray jet's orientation and also includes auxiliary sets of rods with different types and devices for directing the spray jet. These rods serve to direct the spray jet from the sprayer; one rod with the jet of upward-facing spray, one with the spray jet pointing horizontally at 90°, and the last with the downward-facing spray jet in a cone shape, but it is always possible to adjust and correct the orientation of the spray jet.
[0023] The second type of gun has a single rod which does not allow adjustment of the spray jet, which is directed downwards in the shape of a cone.
[0024] Of course, the invention is not limited to the embodiments described, but also includes all technical equipment and their combinations.
Claims
Demands
1. Internal painting method, characterized in that it comprises the following steps: 1) Inserting glass bottles into a heating system of the oven, drying oven or infrared oven type; 2) Heating the bottles; 3) Positioning the heated bottles in a painting equipment; 4) Blowing heated ionized air inside the bottles; 5) Applying the paint inside the bottles; 6) Aspirating the gases generated by the paint and the paint remaining in suspension; 7) Inserting the bottles into the drying oven; and 8) Drying the bottles.
2. Internal painting method according to claim 1, characterized in that the bottles are preheated in the heating system, maintaining the surface to be painted at a temperature of 30°C to 45°C.
3. Internal painting method according to claim 1, characterized in that the bottles pass through a system with 4 nozzles of ionized air heated from 50°C to 70°C, where the air is blown inside the bottles.
4. Internal painting method according to claim 1, characterized in that the internal painting is carried out with a nozzle of a gun directly inserted inside the bottle, with a movement of the rod synchronized with the rotation of the bottle; in this step, it is possible to carry out the painting on four bottles simultaneously, it being understood that the recipe programmed in the equipment will determine the number of sprays, the rotation of the bottle and the depth to which the rod will advance in the bottle to carry out the painting, according to the model of the bottle; the paint guns spray at a pressure and atomization of 6 bar, it being understood that said method uses two types of guns and three types of rods, where each rod has a type of oriented spray, with spray jets having two conical formats and one straight.
5. Internal painting method according to claim 1, characterized in that after painting, nozzles are introduced into the bottles for the aspiration of gases generated by the paint when it comes into contact with the hot surface of the bottle, and the aspiration of the overspray resulting from the paint which is suspended inside the bottle.
6. Internal painting method according to claim 1, characterized in that the drying of the bottles is carried out by continuous convection ovens, with heating by direct or indirect combustion or even by electrical resistances, the ovens being configured according to the type of color pigment used.
7. Internal painting method according to claim 6, characterized in that the paint used is an inorganic paint, and in that the drying includes a tunnel passage time of 240 minutes, in a 6-zone heating oven, starting with the first zone at 100°C and ending at 640°C.
8. Internal painting method according to claim 6, characterized in that the paint used is an organic paint, and in that the drying includes drying at a drying temperature between 180 and 200°C with a tunnel passage time of 50 minutes, and further includes the application of a protective varnish on this paint or the use of a plastic container.
9. Internal painting method according to claim 3, characterized in that the system of four ionized and heated air nozzles is arranged in the painting equipment, and blows air inside the bottle removing moisture, impurities and stabilizing the heating of the bottle surface; said equipment has the capacity to store up to 100 recipes, and to store 10 parameters per recipe; the equipment also implementing two types of guns and three types of rods, each used for a given type of bottle to be decorated.
10. Internal painting method according to claim 9, characterized in that the parameters controlled by recipe are: the height of the bottle, the start of painting, the end of painting, the depth to which the rod will enter the bottle, the number of sprays and the rotation of the bottle; individual control of the pressure and atomization of each of the four guns being possible, the rotation and speed of the tray being adjustable.
11. An internal painting method according to claim 9, characterized in that the first type of spray gun has a special adjustment that achieves adjustment in the orientation of the spray jet, and also with auxiliary assemblies of rods with different types and devices for orienting the spray jet, with one rod whose spray jet is directed upwards, one with the spray jet pointing horizontally at 90°, and the last with the spray jet directed downwards with the cone-shaped spray jet; the second type of gun has a single rod which does not allow adjustment of the spray jet, which is directed downwards in the shape of a cone.