• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An apparatus and method for the spray application of solvent-thinned coating compositions whereby optimum coverage of a substrate with a liquid film is consistently achieved without incurring sagging, run-off or surface irregularities, such as orange peeling, in spite of wide fluctuations in the temperature and/or humidity of the surrounding atmospheric environment. In accordance with the invention, a shroud is provided which is disposed in encompassing relationship around the spray nozzle to which air is supplied at a controlled temperature and/or humidity which envelopes and becomes entrained in the spray forming a controlled localized atmosphere and achieving a controlled vaporization of solvent from the liquid droplets during the course of their travel from the nozzle to the surface of the substrate being coated.
    公开号:SU797556A3
    申请号:SU772497863
    申请日:1977-06-22
    公开日:1981-01-15
    发明作者:Джоунз Блекинтон Розвелл
    申请人:Инмонт Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    (54) METHOD OF DRAWING DILUTED
    SOLVENT COMPOSITIONS AND DEVICE FOR IMPLEMENTATION
    one
    The invention relates to spray coating methods on products and equipment for spraying.
    There is a known method of applying a composition diluted with a solvent to a product by spraying and supplying a nozzle in the form of a jet to the surface of the product and feeding a stream of external air covering this jet.
    The method is carried out with a device for applying a composition diluted with a solvent, containing a sprayer with a nozzle for discharging the composition and a screen mounted on the dispenser in the form of a box with an exit opening, extending the nozzle and protruding over the cut of the composition and supplying a screen of air TlJ.
    The disadvantage of this method is that it is impossible to consistently obtain a uniform coating due to the absence of the possibility of controlling the degree of solvent used on the way to the product being coated.
    The purpose of the invention is to obtain a uniform coating.
    In order to achieve this goal in a method of applying a dilute mortar YY - Wi II 1 1-- ---
    the body of the composition onto the product by spraying and feeding the nozzle as a jet to the surface of the product and supplying a flow of shielding air enclosing this jet; supplying the shielding air is flowed around the nozzle to draw it into the jet of the composition at a pressure below the composition pressure at the nozzle outlet, and regulate at least one of the indicators (temperature and humidity) of the shielding air, to ensure the content of nonvolatile substances in the coating material is higher than the point at which the incrustations form, and below t gel points.
    Regulate the direction of the shielding flow.
    The composition is heated before release from the nozzle.
    Spray air is fed through the nozzle.
    The spray air is heated before it is supplied to the nozzle. As a composition, a paint diluted with water is used with a nonvolatile content of 25 to 28%.
    权利要求:
    Claims (9)
    [1]
    This method is carried out by a device comprising a sprayer with a nozzle for discharging the composition and a screen in the form of a box mounted on the dispenser with an exit opening covering the nozzle and protruding over the cutter as the composition is supplied, and a screening air supply system in which the wall of the box is opposite the exit aperture, mounted close to the spray gun housing to prevent ambient air from entering the duct near the nozzle, the duct being made with a hole that communicates its cavity with the system supply of shielding air, and the device is equipped with means of controlling at least one of the parameters: temperature and humidity of shielding air. The device is equipped with dampers for controlling the directional and shielding air. The device may be provided with means for supplying spray air to the nozzle; or provided with means for feeding the nozzle to the position under pressure. Figure 1 shows the device, a general view; 2, node I, front view; on fig.Z - section BB in figure 2; figure 4 - node T, top view. The device for applying the composition diluted with water contains a spray gun 1 with a nozzle 2, a handle 3 and a trigger 4. The end of the handle 3 is connected by a hose 5 to a spray source of compressed air, for example a blower b. The device can be equipped with a heat exchanger 7 for regulating the temperature of the spray of air. The front of the spray gun 1 is connected by a hose 8 to a reservoir 9 for compositions (paints) diluted with a solvent. The device can be equipped with a pump 10 and a heat exchanger 11 for adjusting the temperature of the paint supplied to the sprayer. In addition, the possibility of supplying paint due to ejection is foreseen. The device is equipped with a removable-mounted on the front of the spray 1 screen in the form of a box 12 with an output opening 13, covering the nozzle 2 and the protrusion beyond its midstream during the paint supply. The duct 12 is made with a hole that communicates its cavity with a shielding air supply system, including a flexible hose 14, an expansion chamber 15 and a heat exchanger, made, for example, in the form of a housing 16 with holes 17 for exhausting air and a tail end 18, in which placed steam injector 19. The device is equipped with means of control at least one of the parameters: temperature and humidity of screened air. To control the temperature of the shielding air, a thermocouple 20 installed in the hose 14 is provided. To control the amount of shielding air, a flow meter 21 with a pitot tube is installed in the expansion chamber 15. The injector 19 is provided with a pipe 22 with a valve 23 for supplying steam, which makes it possible to control the humidity of the shielding air. The sprayer nozzle 2 has an axial chamber 24 in which needle valve 25 is mounted axially displaced to control paint flow and connected to the trigger 8. In the nozzle 2, the annular chamber 26 communicates with the compressed air supply system an annular outlet 27 covering the paint outlet. In the nozzle 2, additional air ducts 28 are diametrically located, communicating with the outlet openings 29. The rear part of the box, with a bent edge, hermetically embraces the nozzle 2. In the front part of the box, an arched notch 30 can be made to provide a flat fan-shaped jet. The device is equipped with mounted on the box with the possibility of adjustment by means of screws 31 V-shaped 32 and two radial 33 valves. The cross-sectional shape of the screen and the shape and number of dampers may vary depending on the design of the nozzle and the properties of the outgoing jet. Nozzles can be of any design, both air and airless. The proposed device is used to paint products placed in the chamber 34 and suspended on hooks 35, for reptiles on the conveyor 36. The chamber has a vent pipe 37. The method for applying the composition diluted with a solvent is carried out using the proposed device as follows. When paint is simultaneously supplied from tank 9 by pump 10 and compressed air is supplied by blower 6 through nozzle 2, the resulting jet is sprayed to the surface of product 38. Turning on steam injector 19 delivers screening air at a pressure below the ink pressure at the nozzle outlet flow around the nozzle 2, which leads to the involvement of the air flow in the sprayed jet due to the Venturi effect, the value of which is maximum at the point where the jet exits the nozzle 1, since the jet velocity On leaving the nozzle, it quickly falls, the parameters of the surrounding dreadlocks do not actually affect the parameters of the jet. When the sprayed jet moves together with the shielding air penetrated into it from the nozzle 2 to the product 38, some of the solvent evaporates and the paint drops partially dry. The ability to control the parameters of the shielding air provides the ability to control the content of nonvolatile in the applied composition to a higher point, at which inclusions form when coating is applied to vertically placed surfaces of products and below the gelation point. The temperature of the shielding air can be controlled by the temperature of the steam supplied to the steam injector 19, which is controlled by the thermocouple 20, and the amount of shielding air can be controlled by changing the pressure of the air supplied to the injector 19, which is controlled by the flow meter 21. To prevent excessive evaporation of the solvent, it can be cooled and / or moistened flow of shielding air, for which water can be supplied, for example, in the form of steam through conduit 23 to injector 19. Using the heat exchanger 11, the composition can be heated (paint ) before her BbgiycKOM from the nozzle. Ink spraying can be carried out with and without air. In the latter case, the ink is supplied to the nozzle under high pressure (for example, above 140 kg / cm). The air going to be sprayed can be heated with the help of a heat exchanger 7. The shape of the sprayed jet can be different - flat, fan-shaped, elliptical or cone-shaped. The direction of the shielding flow can be adjusted using the dampers 32 and 33. The proposed method can be sprayed with compositions containing both organic solvents and water. The composition can be used diluted with water paint with a non-volatile content of from 25 to 28%. Example 1. As a applied composition, use a paint diluted with water, containing a thermostable acrylic polymer with hydroxyl and carboxyl functional groups, neutralized by carboxyl groups with organic amines and cross-linked with melamine-formaldehyde resin at a ratio of 70 parts acrylic and 30 hours melamine. In addition, the composition. contained pigments, fillers, etc. and a solvent consisting of 80-85% water and 15-20% mixing with organic solvent water to provide a non-volatile content of the order of 25%. By applying this composition to a vertical panel with a thickness of about 0.254 mm with a scalpel, it was determined that the point of nonvolatile content at which no sagging is formed is 32% nonvolatile. The gel point for this composition is about 40% non-volatile. From the sprayer this composition was applied at a speed of 482 g / min and a stream of shielding air was applied at a speed of 2.55 at a pressure of 0.035 atm. A liquid film was applied with a thickness of 0.15-0.25 mm 3ei four times (film thickness at one time - 0.038 - 0.064 mm) with an interval of 60 seconds. The product was located at a distance of 35.6 cm from the nozzle. The temperature in the chamber was maintained at 25 s, and the relative humidity was about 85%. , Different non-volatile content in the composition determines the various parameters of the process. For example, a composition with a non-volatile content of 30% sprayed at a speed of 482 g / min requires the supply of 20 kcal / min of heat, which should be supplied to the flow of shielding air flowing at a speed of 7.36 m / min, or reduce the flow rate of the shielding air. (for example, to 0.85), but. increase the temperature (for example, to). A composition with a non-volatile content of 25% requires a feed of 70 kcal / min, which can be supplied with the following shielding air parameters: either at a speed of 7.36 or at 135 ° C and a speed of 2.265 m / min. The composition with a content of 22.5% requires a supply of 97.5 kcal / min either at an air flow temperature of 74 ° C and a speed of 7.36, or at 141 ° C and a speed of 27.5. In the example shown in Fig. 1, the shielding air flow rate is 0.85 m / min, the temperature is that achieved at an air pressure of 0.0002 kg / cm, the flow rate of 20 mV min is reached at a pressure of 0.002 kg / cm, the flow rate is 27 , 5 reach with the advance of 0.0049 kg / cm and the flow rate of 7.36 reach with the deposit of 0.02 kg / cm. In this example, water-diluted acrylic enamel was used with a non-volatile content point at which no mercury was formed, 32%. 1. Method for applying a composition diluted with a solvent to a product by means of spray and spray nozzle as a jet to the surface of the product.
    and supplying a flow of shielding air enclosing this jet, characterized in that, in order to obtain a uniform coating, the supply of shielding air is led by the stream flowing around the nozzle to draw it into the jet of the composition at a pressure below the pressure of the composition at the nozzle outlet, and at least measure one of the parameters (temperature and humidity) of the shielding air, to ensure the content of nonvolatile substances in the coating material is higher than the point at which the tint is formed, and lower than the gelation point.
    [2]
    2. The method according to claim 1, characterized in that it regulates the direction of the screening flux,
    [3]
    3. Method POP1, characterized in that the composition is heated before it is discharged from the nozzle.
    [4]
    4. Method pop.1, the difference is: ayush and with the fact that spray air is supplied through the nozzle.
    [5]
    5. A method according to claim 4, characterized in that the spray air is heated prior to its supply to the oversize bag.
    [6]
    6. Method POP1, characterized in that as a composition, a paint diluted with water is used with a nonvolatile content of from 25 to 28%.
    [7]
    7. A device for carrying out the method according to Claim 1, comprising a dispenser with a nozzle for discharging the composition and a screen in the form of a box mounted on the dispenser with an outlet opening enclosing the nozzle and protruding beyond the section of the composition during the supply of the shielding air, characterized by in that the wall of the duct, opposite the exit aperture, is installed; close to the sprayer body to prevent ambient air from entering the duct near the nozzle, the duct having a hole that communicates it to There is a shielding air supply system, and the device is equipped with means to control at least one of the parameters: shielding air temperature and humidity.
    [8]
    8. The device according to claim 7, characterized in that it is provided with flaps for adjusting the direction of the shielding air.
    [9]
    9. A device according to claim 7, characterized in that it is provided with means for supplying spray air to the nozzle.
    ten . A device according to claim 7, characterized in that it is provided with means for supplying the composition to the nozzle under pressure.
    Sources of information taken into account in the examination
    1. US patent 2597573, cl. 239-288, publ. 1952 (prototype
    L
    -55
    .38
    L
    eleven
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    同族专利:
    公开号 | 公开日
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/698,838|US4132357A|1976-06-23|1976-06-23|Apparatus and method for spray application of solvent-thinned coating compositions|
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