JP4474076B2 - Painting method and equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention related to the coating method and coating equipment for the continuous coating of paint to the object to be coated, several raw paint regarding suitable coating method and coating equipment when used in paint formulation site.
[0002]
[Prior art]
There are various objects to be coated that require coating with paint. Hereinafter, a steel sheet manufactured in the steel industry will be described as an example.
In order to prevent oxidation of the surface of the steel sheet rolled in the hot rolling process, the surface of the steel sheet that has been inspected is coated with a resin-based paint and shipped to customers. The paint used for coating on the steel sheet was purchased in a state of being filled in a metal or resin-made raw material paint supply container called a pail can.
[0003]
The total weight of this container is about 20 kg, and the operator transported the necessary quantity to the painting site, and then the paint was transferred to the paint tank (relay tank) to open the lid and supply it to the painting machine. .
Then, the paint in the tank is agitated by a stirrer installed in the paint tank, and sent to the paint machine through a pump while preventing the paint from being settled. I was painting.
In the case of a multi-component paint, since it solidifies with time when mixed, the paint preparation was carried out just before the application, with the estimated start time of the application.
[0004]
With regard to the coating on steel plates, the details of the coating are determined according to the demands of customers. For example, the manufacturer of paint used, the composition, the thickness of the coating film, etc. are specified. In addition, in order to distinguish the material (steel type) of the steel plate, it was necessary to use various paint colors depending on the steel type.
[0005]
For this reason, when the coating of one lot of steel plates is completed and the next lot of steel plates is coated, a new paint having a different hue from the previous one may be required. In this case, if the paint used last time remains, it will be mixed into a new paint, resulting in a disadvantage that the hue and composition desired by the customer are not obtained.
In order to prevent this, when one lot of steel plates that require painting is completed, the tank (tank) and piping of the paint supply system are washed so that no paint remains, and the next steel plate lot is processed. Work was necessary.
[0006]
[Problems to be solved by the invention]
As mentioned above, since the hue is also designated, even if the composition other than the color type is the same composition, for example, preparing paints of various types such as gray, brown, green, etc. It was necessary to switch each time.
For this reason, since a large amount of raw material paint supply containers (pale cans) were brought into the field and transferred to the paint tanks by the workers, these operations required a great deal of labor.
[0007]
Moreover, since the above-mentioned conventional pail can has a small capacity, it is consumed in a large amount when the steel plate is coated. Since these large-sized pail cans are disposed of as industrial waste, many problems such as high processing costs are required for the treatment of paint adhering to the can in dealing with environmental pollution. I had it.
Furthermore, cleaning of the paint supply system is performed when the paint type is switched. The organic solvent used in cleaning the paint supply system must be regenerated over time using a distillation-type solvent recovery device. However, a great deal of cost was necessary.
[0008]
[Means for Solving the Problems]
The present invention has been made to solve the problems in the conventional methods described above, and the gist of the present invention resides in the following means.
(1) In preparing raw material paints for mixing multiple raw material paints, preparing paints of different hues and sending them to a coating machine, a plurality of raw material paints from a raw material paint transport container are supplied to supply the plurality of raw material paints. the raw material is received in the paint tank, after stored the respective material coating temporarily from said respective material paint tank, the raw material paint supplied to the plurality of mixing tanks equipped with a stirrer while being placed on a weight meter, said A coating method in which a raw material paint is mixed and stirred in a plurality of mixing tanks, and a paint having a predetermined hue is discharged to a relay tank equipped with a stirrer, and the paint is supplied from the relay tank to a coating machine.
[0009]
(2) In addition, using a mixing vessel and / or the relay tank equipped with a cleaning brush, organic also after coating is completed when the paint for the object to be coated is changed, to the mixing tank and / or a relay tank solvent intends rows washed with supply to washing brush (1) the method of coating according.
(3) The coating method according to (2), wherein the organic solvent required for the cleaning is recovered, the impurities and the organic solvent are separated in an organic solvent separation and recovery tank, and the separated organic solvent is recycled.
(4) When the supply of the paint is stopped between the raw material paint tank and the mixing tank or the relay tank and the coating machine, the paint raw material and / or the paint raw material and / or the paint in the piping of the paint supply system is constantly flowed at a flow rate of 0.3 m. The coating method according to (1), wherein the coating is circulated at / sec or more.
[0010]
(5) In a painting facility for mixing a plurality of raw material paints, preparing paints of different hues and sending them to a coating machine, receiving the raw material paint from a raw material paint transport container for supplying a plurality of raw material paints, a plurality of raw paint tank supplies after stored the raw paint temporarily a plurality of mixing tank for mixing raw paint supplied from the respective raw materials paint tanks, it is mixed and stirred with the plurality of mixing tanks in a predetermined of equipped and Tsugiso in for sending color and became paint to the coating machine, the mixing tank and the relay tank equipped with a stirrer and cleaning brushes, further the mixing tank mounting on weight measuring instrument painting equipment, which is location.
[0011]
( 6 ) The coating equipment according to (5) , wherein inner surfaces of the raw material paint tank, the mixing tank, and the relay tank are subjected to Teflon (registered trademark) processing .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The inventors of the present invention have intensively studied to eliminate the problems in the past and have come to see the development of the present invention.
First, prior to detailed description of the present invention, the flow of the coating process will be described using the embodiment of the present invention shown in FIG.
[0013]
FIG. 1 shows a paint preparation facility from the arrival of a raw material paint to a steel plate coating machine. Various raw material paints are carried by a raw material supply container 6 to the vicinity of the raw material paint tank 1 and each raw material paint tank. 1 is supplied in the required amount. From each raw material paint tank 1, a necessary amount of raw material paint is automatically weighed and dispensed to the paint preparation tank (mixing tank 2) according to the amount of steel plate to be coated, and these are stirred by a stirrer 9 provided in the mixing tank 2. By stirring and mixing, a paint having a predetermined hue is produced.
The paint produced in the mixing tank 2 is supplied to the relay tank 3 and sent from the relay tank 3 to the steel plate coating machine 4b through the coating pump 4a to coat the steel plate 7. All of these operations are preferably performed automatically based on commands from the computer.
[0014]
Since various raw material paints must be supplied to the mixing tank 2 in accordance with specifications, paste, paint liquid, and thinner (diluent or cleaning agent) serving as the raw material paint of the paint are supplied to the raw material paint supply container 6 (for example, It is transported with an internal capacity of 1 m ³ and so on. In addition to this, color types for bringing out the hue of the paint are carried in at the same time.
Thereafter, the raw material paint supply container 6 automatically measures and cuts out the required amount into the respective raw material paint tanks 1 (with an internal volume of 0.3 m ³ ) (similar in color type). 1 is dispensed to the mixing tank 2 (with an internal capacity of 0.06 m ³ ) in an amount required for steel plate coating.
[0015]
The mixing tank 2 is placed on the weight measuring device 10, and the supply amount of each raw material paint can be confirmed by measuring the total weight. Moreover, the various raw material paints are stirred by the stirrer 9 installed in the mixing tank 2 to produce a paint having a desired hue.
Therefore, it is preferable to keep two or more mixing tanks in an equipment for continuously coating steel sheets. That is, one is a mixing tank that is used to prepare the currently required paint, and the other one or more are pre-cleaned and prepared for preparation in order to prepare paints with different specifications. In such a state, the paint can be switched immediately.
[0016]
In addition, as described above, cleaning of the paint supply system does not require cleaning due to the use of the same manufacturer's paint for products delivered to the same consumer. For example, when the steel grade is different and the corresponding hue is different Even so, it is only necessary to change the color type to match that, and it is not necessary to clean the tank (tub) and piping of the paint supply system.
[0017]
In the present invention, the cleaning in the mixing tank 2 and the relay tank 3 is smoothly performed in the shortest time and the organic solvent required for the cleaning is performed in a small amount. Applying difficult Teflon coating and brushing with a cleaning brush while supplying organic solvent to the inner wall.
This cleaning brush is composed of a shaft 8a and a brush 8b made of a soft solvent-resistant resin attached to the shaft 8a. When cleaning is not performed, the mixing tank 2 and the relay tank 3 It is in a standby state at an upper standby position (not shown).
Then, when cleaning is required, it descends from the standby position into the mixing tank 2 and the relay tank 3, and the tip of the brush 8b is placed on the inner wall surface of the tank 2, 3 as shown in FIG. It is configured so that it can be set so as to maintain the contact state.
[0018]
At this time, it is preferable to attach a nozzle (not shown) for ejecting cleaning thinner, which is an organic solvent, and the nozzle is placed above the set brush 8b or the brush of the shaft 8a. The cleaning thinner may be ejected from the side provided with 8b.
[0019]
Thus, when the paint in the mixing tank 2 and / or the relay tank 3 is discharged, the cleaning brush in the standby position above the tank is lowered, and the mixing tank 2 and / or the relay tank 3 shown in FIG. After setting at a predetermined position, the movement starts along the inner wall surface of the tank. In synchronization with this movement, the cleaning thinner is sprayed from the nozzle onto the inner wall surface at the position directly above the brush 8b or the front surface where the brush is brushed.
By repeatedly performing the cleaning operation of the inner wall surface with the cleaning brush several times, the paint adhering to the inner wall surfaces of the mixing tank 2 and the relay tank 3 is removed. If this cleaning operation is completed, the cleaning brush is retracted to the standby position.
[0020]
Here, the cleaning thinner used for the cleaning is returned from the mixing tank 2 or the relay tank 3 to the cleaning thinner collection / separation tank 5. Thus, in this cleaning thinner collection / separation tank 5, it is a preferred embodiment that the paint is separated and removed from the returned cleaning thinner, and is again circulated to the nozzle for reuse.
[0021]
Further, in the piping from the coating pump 4a to the coating machine 4b, the cleaning thinner is supplied from the cleaning thinner collection / separation tank 5 to the piping near the coating pump 4a connection, and the cleaning thinner is supplied from the piping near the coating machine 4b connection. It is preferable to provide a pipe for returning to the cleaning thinner collection / separation tank 5.
In addition, if the pipe connection (preferably flexible) to the raw material paint tank 1 is made detachable as the raw material paint supply container 6, the raw material paint supply transport container delivered from the paint manufacturer can be used as it is. It can be used in a form, which reduces the cost and helps to save significant costs.
[0022]
Further, the mixing tank 2 and the relay tank 3 have a capacity of about 0.1 m ³ , and the mixing tank 2 and the relay tank 3 are provided with impellers at the ends in order to prevent the paint from settling and solidifying. When a stirrer 9 provided with 9a is installed and paint is present in the tanks 2 and 3, it is necessary to rotate the impeller 9a and continuously stir the paint.
[0023]
Since the supply of the paint between the raw material paint supply container 6, the raw material paint tank 1, the mixing tank 2, the relay tank 3, the coating pump 4 a, and the coating machine 4 b is performed via a pipe, Since the supply of the paint from the raw material paint tank 1 to the mixing tank 2 is stopped while the preparation of the next paint is started after the preparation of the paint is completed, the inside of the pipe 14 connecting the raw material paint tank 1 and the mixing tank 2 Since the paint remaining on the pipe may be solidified, a bypass pipe 12 is provided between the vicinity of the outlet of the mixing tank 2 of the pipe 14 and the raw material paint tank 1, and the raw material paint tank is provided via the pipe 14 and the bypass pipe 12. It is preferable to prevent the paint flow in the pipe 14 from stopping by circulating to 1.
[0024]
Further, when the application of the paint to the steel plate 7 is stopped for a long time due to the suspension of the steel plate manufacturing equipment, the transport equipment, etc., the paint is solidified in the pipe between the relay tank 3 and the paint pump 4a. Therefore, a bypass pipe 11 is provided between the outlet of the coating pump 4a and the relay tank 3, and the relay tank 3 is sequentially connected to the relay tank 3 through the pipe 13, the coating pump 4a, and the bypass pipe 11. It is preferable to prevent the paint flow in the piping from stopping by circulating.
[0025]
At this time, it is desirable that the circulation flow rate of the raw material paint or paint in the pipes 13 and 14 and the bypass pipes 11 and 12 is always 0.3 m / sec or more. If this speed is less than 0.3 m / sec, the raw material paint or paint (fluid) may sink in the pipes 13 and 14 and the bypass pipes 11 and 12.
The circulation speed does not need to be increased so much, and it is sufficient that the fluid does not settle and solidify, and if the speed is increased without darkness, useless energy is consumed.
[0026]
The present invention can perform rational paint preparation by adopting the above-described configuration. In addition, this invention is not limited to the said Example at all. For example, stirring in each tank having a stirring device may be performed from the beginning without waiting until all of the raw material paint has entered.
[0027]
【The invention's effect】
As described above, according to this onset bright, automatically and for mixing raw paint, it can be carried out quickly. Therefore, when painting the object to be coated, the appropriate amount is automatically weighed from each raw material paint tank to the mixing tank without opening the pail can and transferring to the relay tank each time. Can be cut out and mixed with stirring. Thereby, preparation of the required coating material to a to-be-coated object can be performed efficiently and systematically.
[0028]
In addition, according to the present invention, it is possible to always automatically mix each raw material paint at an appropriate ratio, and to prevent mixing at an incorrect ratio.
Furthermore, since the treatment as industrial waste of the paint supply container (pail can) is avoided, it is possible to cope with the prevention of environmental pollution, and it is possible to eliminate heavy labor of the worker, so that labor is not required.
[Brief description of the drawings]
[Fig. 1] Diagram showing paint blending equipment from coating raw material arrival to steel plate coating machine [Explanation of symbols]
1. 1. Raw material paint tank 2. Mixing tank Relay tank 4a. Paint pump 4b. 4. Coating machine 5. Washing thinner collection / separation tank 6. Raw material supply container Steel plate 8a. Cleaning brush shaft 8b. Brush 9. Agitator 9a. Impeller 10. Weight measuring instrument 11,12. Bypass pipes 13,14. Piping

Claims (6)

In the preparation of raw material paint for mixing multiple raw material paints, preparing paints of different hues and sending them to the coating machine, the raw material paints from the raw material paint transport container are supplied to the raw material paints to supply the raw material paints. receiving in the tank, after stored the respective material coating temporarily from said respective material paint tank, the raw material paint supplied to the plurality of mixing tanks equipped with a stirrer while being placed on a weight meter, said plurality mixed A coating method characterized by dispensing a paint having a predetermined hue by mixing and stirring raw material paints in a tank, and supplying the paint from the relay tank to a coating machine. Furthermore, using a mixing vessel and / or the relay tank equipped with a cleaning brush, or after painting is finished when the paint for the object to be coated is changed, supplying organic solvent to the mixing vessel and / or a relay tank 2. The coating method according to claim 1, wherein cleaning is performed with a cleaning brush.   The coating method according to claim 2, wherein the organic solvent required for the cleaning is recovered, impurities and the organic solvent are separated in an organic solvent separation and recovery tank, and the separated organic solvent is recycled.   When the supply of paint is stopped between the raw material paint tank and the mixing tank or the relay tank and the coating machine, the paint raw material and / or the paint raw material in the piping of the paint supply system and / or the paint is constantly flowed at a flow rate of 0.3 m / sec or more. The coating method according to claim 1, wherein the coating method is circulated. In a painting facility that mixes multiple raw material paints, prepares paints of different hues, and sends them to the coating machine, it accepts the raw material paint from the raw material paint transport container to supply multiple raw material paints, a plurality of raw paint tank supplies after temporarily stored, and a plurality of mixing tank for mixing raw paint supplied from the respective raw materials paint tanks, it is mixed and stirred with the plurality of mixing tank and predetermined hue the became coating equipped with Tsugiso in for sending to the coating machine, the mixing tank and the relay tank equipped with a stirrer and cleaning brushes, further the mixing vessel is placed on the weighing instrument painting equipment, characterized in that there. 6. The coating equipment according to claim 5 , wherein inner surfaces of the raw material paint tank, the mixing tank, and the relay tank are subjected to Teflon (registered trademark) processing.

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