JP2008302319A - Coating material removal device and coating material removal system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently and safely remove a coating material stuck on a material to be treated such as a coating tool. <P>SOLUTION: The coating material removal device includes a treating chamber S for treating the material 2 to be treated and a cleaning solution supply mechanism 18 for supplying a cleaning solution to the material 2 to be treated in the treating chamber S. The treating solution is a vegetable detergent or a solution prepared by diluting the vegetable detergent. The cleaning solution supply mechanism 18 is provided with a tank 51 for storing the cleaning solution, a heater 55 for heating the cleaning solution in the tank 51, a nozzle 53 for discharging the cleaning solution in the treating chamber S shower-like and a pump 62 sending the cleaning solution in the tank 51 to the nozzle 53. A drainage port 23 for draining the cleaning solution in the treating chamber S is provided and the cleaning solution drained through the drainage port 23 is returned to the tank 51 to be stored. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a paint removing device and a paint removing system for removing paint attached to an object to be processed.

  2. Description of the Related Art Conventionally, in a process of coating various articles to be coated (products) in a production factory or the like, a fixing jig for fixing the article to be coated, a masking jig for masking, and the like are used. Such coating jigs (fixing jigs, masking jigs, etc.) need to be cleaned periodically in order to remove the paint adhering during the coating. A solvent such as thinner is generally used as a cleaning liquid used in such paint removal processing (cleaning processing). Also, such paint removal processing is usually performed manually, such as when an operator holds a coating jig and swings in the cleaning liquid, or wipes the paint with a sponge or cloth impregnated with the cleaning liquid. ing. In addition, a cleaning liquid made of a solvent other than a solvent such as thinner, for example, a water-soluble compound has been developed (see Patent Document 1). Further, a method has been proposed in which an adhesion layer (film) is formed on the surface of the coating jig before the coating jig is used for coating the article to be coated, so that the coating is easily peeled off (see Patent Document 2).

JP-A-9-67597 JP 2006-206791 A

  Since the conventional paint removal process is performed manually by the operator, there is a problem that the burden on the operator is heavy and the work efficiency is poor. In addition, many cleaning liquids required careful handling. For example, when using thinner as a cleaning solution, there are concerns about toxicity to the human body and the environment, and since the flash point of the thinner is low, there is a risk of causing an accident such as a fire. , Inspection of ventilation facilities, notification of businesses by PRTR law, etc.). In addition, in the ISO 14000 series standards, it is necessary to accurately manage the amount of thinner used in accordance with environmental improvement requirements. Thus, the use of thinner is burdensome for both operators and operators. However, until now, there has been almost no cleaning liquid to replace the thinner, that is, a cleaning liquid with high safety while having a cleaning power (paint removal performance) equal to or higher than that of the thinner. Inevitably, thinners have been widely used.

  In addition, the use of highly safe cleaning liquids other than solvents such as thinner has been tried, but the use of cleaning liquids with higher cleaning power and safety, that is, reduction of the influence on the human body and environment, biodegradation Improvements in cleaning properties and detergency have been demanded. Moreover, when using the method which forms an adhesion layer on the surface of the jig for coating before the coating of the article to be coated as shown in Patent Document 2, an adhesion layer forming step is necessary, There was a difficulty that increased the work load.

  This invention is made | formed in view of said point, and it aims at providing the coating material removal apparatus and coating material removal system which can remove the coating material adhering to a to-be-processed object efficiently and safely.

  In order to solve the above problems, according to the present invention, an apparatus for removing paint adhering to an object to be processed with a cleaning liquid, a processing chamber in which the object to be processed is processed, and an object to be processed in the processing chamber There is provided a paint removal apparatus, comprising a cleaning liquid supply mechanism for supplying a cleaning liquid to a body, wherein the cleaning liquid is a vegetable detergent or a solution obtained by diluting the vegetable detergent.

  The content of water in the cleaning liquid may be 20% by weight or more. Further, the content of the vegetable detergent in the cleaning liquid may be 70% by weight or more. The flash point of the cleaning liquid may be 79 ° C. or higher.

  The cleaning liquid supply mechanism may supply the cleaning liquid to the object to be processed in a state where the temperature of the cleaning liquid is adjusted to 35 ° C. to 40 ° C. The cleaning liquid supply mechanism may supply the cleaning liquid to the object to be processed at a supply pressure of 0.02 MPa to 0.2 MPa.

  Further, the cleaning liquid supply mechanism includes a tank for storing the cleaning liquid, a heater for heating the cleaning liquid in the tank, a nozzle for discharging the cleaning liquid in a shower shape in the processing chamber, and the cleaning liquid in the tank for the nozzle. And a pump for feeding liquid. Further, a drain port for draining the cleaning liquid in the processing chamber may be provided, and the cleaning liquid drained through the drain port may be stored in the tank.

  According to the present invention, there is provided a paint removal system comprising the paint removal apparatus according to any one of the above and a distillation regeneration apparatus that performs distillation regeneration of the cleaning liquid. The distillation temperature of the distillation regenerator may be 250 ° C to 290 ° C.

  ADVANTAGE OF THE INVENTION According to this invention, the paint removal process of a to-be-processed object can be performed efficiently, and a worker's work burden can be reduced. By using a vegetable detergent, the paint removal process can be performed safely, and the influence on the human body and the environment can be reduced.

  Embodiments according to the present invention will be described below. As shown in FIG. 1, the paint removal system 1 according to the present embodiment is a paint removal apparatus that performs paint removal processing (cleaning processing) that removes the paint adhering to the object to be processed 2 with a cleaning liquid (paint peeling liquid). 3 (cleaning device) and a distillation regenerating device 5 for distilling and regenerating the cleaning liquid used in the paint removing process in the paint removing device 3.

  The object to be treated 2 in the present embodiment is, for example, a painting jig used when painting an article to be painted (product) such as an automobile part (fixing jig for fixing the article to be coated, masking jig for masking, etc.). It is. The material of the workpiece 2 may be a metal such as steel.

  The paint removing apparatus 3 includes a processing tank 10 having a processing chamber S for storing the object 2 to be processed (processing of the object 2 to be processed), and a storage chamber 12 in which various devices and pipes are disposed. And a control box (control computer) for controlling the paint removing device 3 and a control box 13 provided with an operation panel 13a and the like. In the illustrated example, the storage chamber 12 is provided below the processing tank 10, and the control box 13 is provided on the side of the processing tank 10 and the storage chamber 12. Further, the paint removing device 3 is a processing object holding and rotating mechanism 17 that rotates in the processing chamber S while holding the processing object 2, and a cleaning liquid supply that circulates and supplies the cleaning liquid to the processing object 2 in the processing chamber S. A mechanism 18 is provided.

  As shown in FIG. 2, the processing tank 10 includes a tank body 21 having an open top surface and a lid body 22 having an open bottom surface. The lid 22 is provided above the tank body 21 and opens and closes the upper surface opening of the tank body 21 from above. That is, the workpiece 2 is carried into or out of the processing tank 10 through the upper surface opening of the tank body 21. In addition, the processing chamber S is formed inside the processing tank 10 by closing the upper surface opening of the tank body 21 from above by the lid 22.

  As shown in FIGS. 2 and 3, the bottom plate 21 a of the tank body 21 has an opening 23 for draining the cleaning liquid from the inside of the tank body 21 (the bottom of the processing chamber S). Below the drainage port 23, a tank 51 described later is installed.

  The workpiece holding and rotating mechanism 17 includes a holder 31 (turn table) that holds the workpiece 2, a rotary shaft 32 that supports the holder 31, and a motor 33 that generates power for rotating the holder 31 and the rotary shaft 32. (Electric motor) and a power transmission unit 35 for transmitting the power of the motor 33 to the rotary shaft 32. The holding body 31 is provided inside the tank body 21 (lower part of the processing chamber S). On the other hand, the motor 33 and the power transmission unit 35 are provided in the storage chamber 12, and the rotating shaft 32 is provided so as to penetrate the bottom plate 21 a of the tank body 21 in the vertical direction.

  The holding body 31 includes a plurality of (for example, four) arms 31a on which the workpiece 2 is placed. Each arm 31a is provided so as to extend radially from the central portion (the upper end portion of the rotation shaft 32) of the holding body 31 along the radial direction (substantially horizontal direction) and in different directions. In the illustrated example, the four arms 31a are arranged so as to form a substantially cross shape in plan view. The base end portion of each arm 31 a (the lower surface central portion of the holding body 31) is fixed to the upper end portion of the rotating shaft 32. That is, the holding body 31 rotates integrally with the rotation shaft 32 with the central axis of the rotation shaft 32 as the rotation center axis. In addition, a pin 31b for holding the object to be processed 2 from the periphery is provided on the top surface of the tip of each arm 31a.

  The rotating shaft 32 is provided with its length direction (axial direction) oriented in a substantially vertical direction. Moreover, it is hold | maintained by the bearing part 32a provided in the center part of the baseplate 21a, and it is rotatably attached with respect to the baseplate 21a centering | focusing on the center axis | shaft of the rotating shaft 32. As shown in FIG. The above-described holding body 31 is attached to the upper end portion of the rotating shaft 32. A driven pulley 35b described later is attached to the lower end portion of the rotating shaft 32.

  The main body of the motor 33 (motor main body 33a) is fixed to the ceiling of the storage chamber 12 (the lower surface of the bottom plate 21a). The power transmission unit 35 is bridged between a drive pulley 35a attached to the output shaft 33b of the motor 33, a driven pulley 35b attached to the lower end of the rotary shaft 32, and between the drive pulley 35a and the driven pulley 35b. The endless drive belt 35c is provided. That is, when the drive pulley 35a is rotated by driving the motor 33, the drive belt 35c is rotated according to the rotation of the drive pulley 35a, and the driven pulley 35b is rotated along with the rotation of the drive belt 35c. The rotary shaft 32 and the holding body 31 are configured to be rotated around the central axis of the rotary shaft 32 integrally with the driven pulley 35b. With this configuration, the cleaning liquid can be efficiently supplied to the target object 2 by rotating the holding body 31 and supplying the cleaning liquid while rotating the target object 2.

  The cleaning liquid supply mechanism 18 discharges the cleaning liquid stored in the tank 51 from the tank 51 in the processing chamber S in a shower shape, the tank 51 for storing the cleaning liquid, the liquid feeding path 52 for sending the cleaning liquid in the tank 51. And a nozzle 53 (shower nozzle). The tank 51 is provided in the storage chamber 12, and the nozzle 53 is supported by a nozzle support 54 inside the processing tank 10.

  The upper surface of the tank 51 is opened, and this upper surface opening is disposed directly under the drainage port 23 described above. That is, the inside of the tank body 21 and the inside of the tank 51 are communicated vertically through the drainage port 23 so that the drained liquid (cleaning liquid) that has fallen to the drainage port 23 is received by the tank 51 and collected. It is configured.

  In addition, the tank 51 is provided with a heater 55 that heats the cleaning liquid in the tank 51. In the example shown in FIG. 1, the heater 55 is a plug heater, and has a heat transfer tube 55 a in which a heating element (not shown) is built, and the heat transfer tube 55 a is inserted in the lower portion inside the tank 51. It is attached. That is, the heater 55 indirectly transfers the heat generated by a heating element (not shown) in the heat transfer tube 55a to the cleaning liquid in the tank 51 through the heat transfer pipe 55a, thereby indirectly supplying the cleaning liquid. It is configured to perform heating.

  Furthermore, the tank 51 is provided with a thermostat 56 (temperature detection unit) that is switched between an on state and an off state according to the ambient temperature (temperature of the cleaning liquid). Two thermostats 56 are provided above and below the heat transfer tube 55a in the vertical direction. Each thermostat 56 is configured to be in an on state when the ambient temperature is lower than a predetermined operating temperature, and to be in an off state when the ambient temperature is higher than a predetermined operating temperature. When one or both of the two thermostats 56 are turned off, the heater 55 is turned off, the heat generation is stopped, and when both are turned on, the heater 55 is turned on. It is configured to generate heat. Two such thermostats 56 are provided, and a dual safe system is realized by detecting the temperature of the liquid temperature twice. That is, when the temperature of the cleaning liquid rises, any one of the thermostats 56 malfunctions, and even if the rise in the liquid temperature cannot be detected (even if switching from the on state to the off state is not performed). The other thermostat 56 can reliably detect the rise in the liquid temperature, and can reliably switch the heater 55 to the OFF state. Therefore, it is possible to prevent the cleaning liquid from being heated excessively.

  The liquid feeding path 52 is disposed inside the storage chamber 12 and the nozzle support 54. The upstream end of the liquid feeding path 52 is connected to the lower part of the tank 51 in the storage chamber 12. The downstream side of the liquid feeding path 52 is disposed along the inside of the nozzle support 54, is branched into two at the upper part of the nozzle support 54, and is connected to two nozzles 53 to be described later. Yes.

  The liquid supply path 52 is provided with a pump 62 that provides power for supplying the cleaning liquid in the tank 51 (in the liquid supply path 52) from the tank 51 side toward the nozzle 53 side. The pump 62 is installed in the storage chamber 12. The pump 62 may be configured using a special resin having resistance (chemical liquid resistance) to the cleaning liquid. If it does so, corrosion and failure of pump 62 can be prevented suitably. The performance of the pump 62 only needs to be such that the supply pressure of the cleaning liquid through the liquid supply path 52 (that is, the shower pressure of the nozzle 53) can be set to about 0.02 MPa to 0.2 MPa, for example. Even with such a relatively low supply pressure, according to the present embodiment, the paint can be reliably removed. In addition, it is not desirable from the viewpoint of safety to apply a high pressure to the flammable paint, so it is preferable to supply the cleaning liquid at a low pressure and maintain the internal pressure of the processing chamber S as low as possible.

  The nozzle 53 and the nozzle support 54 are installed inside the processing tank 10. In the example shown in FIG. 3, two nozzles 53 are provided side by side above the holding body 31 (a position above the object to be processed 2 held by the holding body 31). The two nozzles 53 are disposed substantially parallel to each other with their length directions oriented in a substantially horizontal direction, and are attached to the upper end portion of the nozzle support body 54 via the nozzle support body 54. The tank body 21 is fixed.

  A plurality of discharge ports 53 a for discharging the cleaning liquid from the nozzles 53 are provided on the lower surface of each nozzle 53. The discharge ports 53 a are provided in a line along the length direction of each nozzle 53. That is, each nozzle 53 discharges the cleaning liquid through a plurality of discharge ports 53a, thereby causing the cleaning liquid to flow downward (that is, from above with respect to the target object 2 held by the holding body 31). It is the composition which discharges in the shape.

  As the cleaning liquid, a liquid having a property capable of dissolving the paint adhering to the object to be processed is used. The cleaning liquid is preferably a detergent mainly composed of plant-derived components (for example, plant surfactants, plant fatty acids, etc.) made from plants, that is, plant detergents, more preferably Desirably, the detergent is a detergent having all components derived from plants, that is, a pure vegetable detergent. The washing liquid may be a solution obtained by diluting a vegetable detergent with a solvent such as water, and more preferably a solution obtained by diluting a pure vegetable detergent with a solvent such as water. .

  Vegetable detergents are low in ignitability and do not contain various harmful substances (such as environmental hormone substances, petroleum distillates, etc.) that are harmful to the human body and the environment, and are characterized by low toxicity that can be ignored. . Since there is no toxicity to the human body, it is not necessary to equip protective equipment (respiratory protective equipment, protective gloves, protective clothing, etc.), and handling is easy.

In addition, the vegetable detergent is highly biodegradable (microbe degradable), and for example, when conditions such as pH value are adjusted, it is rapidly decomposed by microorganisms, and the vegetable components are water (H ₂ O), carbon dioxide. It is almost completely decomposed into (CO ₂ ), an element such as an inert mineral, and an inert compound composed of the element. Therefore, when the cleaning liquid is disposed of, the components of the detergent can be quickly microbially decomposed, detoxified, and naturally reduced, so that the environmental load is small and safe. Therefore, the cost required for disposal can be greatly reduced as compared with a cleaning liquid using petroleum solvents such as conventional thinner.

  In addition, as a vegetable detergent, you may use "PAINTSOLV-R (brand name)" which is a detergent (pure vegetable detergent) by Infiniti, for example. PAINTSOLV-R is a water-soluble liquid and is a mixture composed of a plant surfactant, a plant fatty acid, and other plant components (components obtained from plants). In addition, phosphates, silicates, sulfates, sulfonates, caustic agents such as caustic soda, petroleum surfactants / petroleum solvents, petroleum distillates, glycols such as glycol ethers, d- This liquid does not contain terpenes such as limonene, chlorines such as bleach, reagents, thickeners, preservatives, colorants, and fragrances.

  Further, the flash point of PAINTSOLV-R (stock solution) (measured by a setter sealing test) is about 79 ° C., but the flash point when diluted with water increases as the water content increases. That is, the flash point of a solution (cleaning solution) obtained by diluting PAINTSOLV-R with water is 79 ° C. or higher. Thus, accidents such as fire can be prevented by using a cleaning liquid having a high flash point (low ignitability).

  The higher the concentration of the detergent in the cleaning liquid, the more efficiently the paint can be dissolved. For example, when the above PAINTSOLV-R or the like is used as a detergent, the detergent content in the cleaning liquid may be 70% by weight or more (70% to 100% by weight), and other components may be water (including water in the cleaning liquid). The rate may be 30% by weight or less).

  For example, when PAINTSOLV-R or the like is used as a detergent, the content of water in the cleaning liquid may be 20% by weight or more. In this case, the flash point of the cleaning liquid can be eliminated and the fire law is not applicable. That is, the safety of the cleaning liquid can be further improved. For example, the detergent content in the cleaning liquid may be 80% by weight or less, and the other components may be water (the water content in the cleaning liquid may be 20% by weight or more).

  Further, the cleaning liquid may be supplied in a state of being heated to a temperature higher than room temperature (a temperature lower than the flash point). If it does so, a cleaning power can be raised further rather than the case where a cleaning liquid is supplied to the to-be-processed object 2 with normal temperature, and the process efficiency of a paint removal process can be improved. For example, when PAINTSOLV-R or the like is used as a detergent, the cleaning liquid may be supplied to the object to be processed 2 in a state where the temperature of the cleaning liquid is adjusted to about 35 ° C. to 40 ° C. That is, the temperature of the cleaning liquid in the tank 51 may be kept at about 35 ° C. to 40 ° C. by the heater 55. Thereby, the cleaning power of the cleaning liquid can be sufficiently increased.

  The distillation regeneration device 5 may be a commercially available product. Preferably, a distillation temperature of 250 ° C. to 290 ° C. can be used. According to such a distillation temperature, the distillation regenerated liquid (cleaning liquid used in the paint removal process) can be returned to almost the same components as the new liquid (unused cleaning liquid).

  Next, the paint removal process in the paint removal system 1 configured as described above will be described. First, the lid 22 of the treatment tank 10 is lifted from the tank body 21 to open the upper surface opening of the tank body 21. And the to-be-processed object 2 to which the coating material has adhered is carried in in the tank main body 21 through upper surface opening, and is mounted on the holding body 31, and is hold | maintained. Thereafter, the lid body 22 is lowered, and the upper surface opening of the tank body 21 is closed. Thereby, the processing chamber S is formed inside the processing tank 10.

  When the object 2 is thus stored in the processing chamber S, the operation panel 13a is operated to start a predetermined cleaning process. In such processing, the workpiece 2 is rotated by the workpiece holding and rotating mechanism 17, and the cleaning liquid is supplied from the nozzle 53 to the rotating workpiece 2. That is, in the target object holding and rotating mechanism 17, the rotating shaft 32 and the holding body 31 are rotated by the drive of the motor 33 and the power transmission of the power transmission unit 35, and the target object 2 held by the holding body 31 is The holding pair 31 is rotated around the rotation shaft 32 integrally. On the other hand, in the tank 51, the cleaning liquid whose temperature is adjusted to about 35 ° C. to 40 ° C., for example, by heating of the heater 55 is supplied to each nozzle 53 through the liquid supply path 52 by driving the pump 62. The cleaning liquid is discharged from the plurality of discharge ports 53a at a supply pressure of about 0.02 MPa to 0.2 MPa, for example, and is discharged from the upper side into a shower shape. Thus, when the cleaning liquid is supplied to the object to be processed 2, the paint adhering to the object to be processed 2 is dissolved and washed away by the action of the cleaning liquid.

  Thus, by supplying the cleaning liquid in a shower shape while rotating the object to be processed 2, the cleaning liquid can be uniformly and efficiently supplied to the entire surface of the object to be processed 2. That is, it is possible to prevent the occurrence of uneven cleaning (residual paint) and to reliably remove the paint. Further, the dissolved paint can be efficiently shaken off from the workpiece 2 by centrifugal force and reliably removed. Moreover, the cleaning power of the cleaning liquid can be increased by supplying the cleaning liquid to the target object 2 (paint) in a state where the temperature of the cleaning liquid is adjusted to about 35 ° C. to 40 ° C. as compared with the case where the cleaning liquid is supplied at room temperature. Therefore, cleaning can be performed more efficiently. Furthermore, by supplying the cleaning liquid at a low pressure of about 0.02 MPa to 0.2 MPa, the processing chamber S can be prevented from becoming high pressure, that is, the combustible paint can be prevented from being exposed to high pressure. That is, there is no fear that the paint will ignite, and cleaning can be performed safely.

  The cleaning liquid and dissolved paint supplied to the object to be processed 2 are shaken off from the object to be processed 2, discharged from the processing chamber S through the liquid discharge port 23, and received by the tank 51. The used cleaning liquid collected in the tank 51 is used again for the paint removal process. That is, it is heated again in the tank 51 and supplied again to the object 2 through the liquid supply path 52 and the nozzle 53. In this way, the cleaning liquid can be circulated repeatedly and reused.

  When the cleaning liquid is thus supplied to the object to be processed 2 and the paint is washed off from the object to be processed 2, the operation of the pump 62, that is, the supply of the cleaning liquid is stopped. And after rotating the to-be-processed object 2 and shaking off the cleaning liquid remaining on the to-be-processed object 2, the drive of the motor 33, ie, the rotation of the to-be-processed object 2, is stopped. And the cover body 22 is lifted, the upper surface opening of the tank main body 21 is opened, and the to-be-processed target object 2 is carried out from the tank main body 21 through the upper surface opening. As described above, the paint removal process in the paint removal apparatus 3 is completed.

  The used cleaning liquid (mixed solution of the cleaning liquid and the dissolved paint) in the tank 51 can be taken out from the paint removing apparatus 3 as appropriate (for example, periodically) and put into the distillation regenerator 5 for regeneration. That is, by performing distillation regeneration, the dissolved paint can be separated from the cleaning liquid and regenerated into a liquid having almost the same composition as that of the new cleaning liquid, thereby recovering the cleaning ability. Therefore, since the cleaning liquid can be reused for the paint removal process many times without being discarded, the consumption of the cleaning liquid can be suppressed, which is economical. Note that the amount of the cleaning liquid may decrease due to adhesion to the object to be processed 2 or the like, but the cleaning liquid corresponding to such a decrease may be appropriately replenished, and the replacement of the cleaning liquid is almost unnecessary.

  As described above, according to the paint removal system 1, the paint removal process of the workpiece 2 can be efficiently and automatically performed. Therefore, it is possible to reduce the work burden on the worker. Further, by using a vegetable detergent (detergent made of a component obtained from a plant) for the cleaning liquid, the paint removal treatment can be performed safely, and the influence on the human body and the environment can be reduced. Such cleaning liquids are not toxic to the human body and the environment, do not ignite, and are not regulated by laws and regulations. That is, it is less burdensome for the operator and the operator, and can be used as a safe cleaning liquid instead of the thinner. Moreover, according to the above paint removal method, it is not necessary to perform a pre-treatment such as forming an adhesion layer on the object to be treated 2 before painting the article to be coated, and the paint can be easily removed.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  For example, the object to be treated 2 is not limited to a painting jig used when painting automobile parts, but other industrial products such as parts used in general machines, electric machines, precision machines, etc. It may be a painting jig used for painting. The paint adhering to the object to be treated 2 (the paint removed by the cleaning liquid) is not limited to the paint used for painting automobile parts, and is various paints used for painting other industrial products. Also good. That is, the above embodiment is not limited to the cleaning of the painting jig used when painting automobile parts, and can be applied to various paint removal processes.

  Further, the shape of the holding body 31, the number and arrangement of the nozzles 53, the arrangement of the discharge ports 53a, and the like are not limited to the above embodiment.

  The to-be-processed object 2 to which the paint of the semi-dry state (the state which was not dried completely) adhered was processed by the apparatus which has the structure substantially the same as the paint removal apparatus 3 demonstrated in embodiment. The film thickness of the paint adhering to the workpiece 2 was about 0.5 mm. The amount of cleaning liquid stored in the tank 51 before starting the paint removal process (the amount of cleaning liquid circulated in the cleaning liquid supply mechanism 18) was 50 liters. As a washing solution, a solution obtained by diluting PAINTSOLV-R with water was used. As a result, the paint removal processing of the object 2 was completed within 10 minutes.

  In addition, when the lifetime of the cleaning liquid (a period in which the cleaning liquid can be continuously used repeatedly without performing distillation regeneration of the cleaning liquid) was calculated from the PAINTSOLV-R diluted with water, the tank 51 before starting the paint removal process was calculated. When the amount of the cleaning liquid stored in the tank is 50 liters and it is assumed that about 2.5 liters of paint is dissolved in the cleaning liquid every day, the life of the cleaning liquid is confirmed to be about 10 to 20 days. In other words, the paint removal process can be performed continuously and efficiently without replacing the cleaning liquid and cleaning liquid distillation regeneration for a long period of about 10 to 20 days. Therefore, it can be said that the work load of the worker is small.

  In addition, after using a cleaning solution composed of a solution obtained by diluting PAINTSOLV-R with water for the paint removal treatment, the used cleaning solution is distilled and regenerated by a device having substantially the same configuration as the distillation regenerating device 5, Component analysis of the distilled regenerated solution was performed. As a result, 98% or more of the components of the distillation regenerated liquid regenerated at 290 ° C. were the same as the components of the new liquid (unused cleaning liquid). Therefore, it was confirmed that this cleaning liquid can be reliably regenerated by distillation and returned to the same liquid as the new liquid.

(Distillation regeneration test)
A cleaning solution comprising a solution obtained by diluting the above PAINTSOLV-R with water was used for the paint removal treatment, and then a test for regenerating the used cleaning solution by distillation was performed. The weight of the cleaning liquid before distillation regeneration (amount including the weight of the container (18 L can) containing the cleaning liquid) was about 17 kg. The initial set temperature for distillation regeneration (distillation temperature, heater set temperature for the distillation regenerator) was 250 ° C. Under such conditions, the operation of the distillation regenerator was started. Immediately after the start of operation, the recovery of the cleaning liquid was performed smoothly, but the recovery speed of the cleaning liquid became slower with the passage of time. To 280 ° C. Furthermore, the set temperature was increased from 280 ° C. to 290 ° C. after about 6 hours and 15 minutes from the start of operation. About 8 hours after the start of operation, the recovered amount became very small, so the operation of the distillation regenerator was terminated. The weight of the cleaning liquid (distilled regenerated liquid) after the operation (the amount including the weight of the container (18 L can) containing the cleaning liquid) was about 15 kg. Although the above distillation regeneration required about 8 hours, it is considered that the time required for the distillation regeneration can be further shortened by setting the initial set temperature to a temperature higher than 250 ° C., for example, about 290 ° C. In addition, as a result of analyzing the components of the distilled regenerated liquid and the new liquid (unused cleaning liquid) by gas chromatography, the components of the distilled regenerated liquid and the components of the new liquid were almost the same. I found that I was able to play it.

(Work environment measurement)
The working environment was measured at a work place (painting room for painting automobile parts) in which a device substantially the same as the paint removing device 3 described in the embodiment was installed. As shown in FIG. 4, the vertical and horizontal dimensions of the work place are 6 m × 4 m. In the work place, the painting apparatus for painting the article to be painted (automobile parts) and the article to be painted in the painting apparatus are dried. A paint removal device (apparatus having substantially the same configuration as the paint removal device 3) for performing paint removal processing of a coating jig (fixing jig, that is, the object to be processed 2) used in a drying furnace and a coating device; A jig drying device for drying the paint jig that has been subjected to paint removal processing in the paint removing device was installed. The cleaning liquid used in the paint removal apparatus was a solution obtained by diluting PAINTSOLV-R with water. The measurement target substances were n-hexane, ethyl acetate, IPA, toluene, xylene, and butyl acetate. In addition, five measurement points (1) to (5) shown in FIG. 4 were set as A measurement points, and (B) was set as a B measurement point.

  As a result of this work environment measurement, the management category was evaluated as the first management category. That is, the concentration of harmful substances such as n-hexane, ethyl acetate, IPA, toluene, xylene, and butyl acetate was sufficiently reduced, and it was determined that the work environment management was appropriate.

(Comparative example)
The working environment was measured in a conventional workplace (a painting chamber in which a paint tank was manually removed and a cleaning tank using a thinner as a cleaning liquid was installed). As a result, the management category was evaluated as the second management category. That is, it was judged that the concentration of harmful substances was not sufficiently reduced, and there was room for improving work environment management.

  In addition, in the conventional work place, when the work is performed in a state where the processing amount of the article to be coated and the paint removal processing amount of the coating jig (ie, the amount of thinner used) are reduced, the management category is the first management category. It was evaluated. In other words, if it is attempted to maintain the management category in the first management category, it is necessary to reduce the amount of thinner used in the paint removal process. It has become difficult to improve productivity. In other words, it was found that improvement in safety and improvement in productivity can be realized at the same time by changing the cleaning solution used in the paint removal process from thinner to a diluted solution of vegetable detergent.

  The present invention can be applied to, for example, a paint removing apparatus and a paint removing system for removing paint adhering to a painting jig such as a fixture for fixing an article to be coated and a masking jig.

It is a front view of the paint removal system concerning this embodiment. It is sectional drawing by the II line | wire in FIG. 1 (vertical sectional view of a coating material removal apparatus). It is sectional drawing (cross-sectional view of a coating material removal apparatus) by the II-II line in FIG. It is a schematic plan view of the work place which performed the work environment measurement concerning an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paint removal system 2 To-be-processed object 3 Paint removal apparatus 5 Distillation reproduction apparatus 10 Processing tank 17 To-be-processed object holding | maintenance rotation mechanism 18 Cleaning liquid supply mechanism 21 Tank main body 22 Lid body 31 Holding body 32 Rotating shaft 33 Motor 51 Tank 52 Liquid supply path 53 Nozzle 55 Heater 62 Pump

Claims (10)

An apparatus for removing paint adhering to the object to be treated with a cleaning liquid,
A processing chamber in which an object to be processed is processed;
A cleaning liquid supply mechanism for supplying a cleaning liquid to an object to be processed in the processing chamber;
The paint removing apparatus, wherein the cleaning liquid is a vegetable detergent or a solution obtained by diluting the vegetable detergent. The paint removal apparatus according to claim 1, wherein the water content in the cleaning liquid is 20 wt% or more. The paint removal apparatus according to claim 1 or 2, wherein a content of the vegetable detergent in the cleaning liquid is 70% by weight or more. The paint removal apparatus according to claim 1, wherein the cleaning liquid has a flash point of 79 ° C. or higher. The paint removal apparatus according to any one of claims 1 to 4, wherein the cleaning liquid supply mechanism supplies the cleaning liquid to the object to be processed in a temperature-controlled state at 35 ° C to 40 ° C. The paint removal apparatus according to claim 1, wherein the cleaning liquid supply mechanism supplies the cleaning liquid to the object to be processed at a supply pressure of 0.02 MPa to 0.2 MPa. The cleaning liquid supply mechanism includes a tank that stores the cleaning liquid, a heater that heats the cleaning liquid in the tank, a nozzle that discharges the cleaning liquid in a shower shape in the processing chamber, and a cleaning liquid in the tank that is sent to the nozzle. The paint removal apparatus according to claim 1, further comprising a liquid pump. A drainage port for draining the cleaning liquid in the processing chamber is provided,
The paint removing apparatus according to claim 7, wherein the cleaning liquid drained through the drain port is stored in the tank. The paint removing device according to any one of claims 1 to 8,
A paint removal system comprising: a distillation regeneration device that performs distillation regeneration of the cleaning liquid. The paint removal system according to claim 9, wherein a distillation temperature of the distillation regenerator is 250C to 290C.

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