JP5641659B2 - Double-sided coating method for porous plates - Google Patents

Description

  The present invention relates to a double-sided coating method for a porous plate having irregularities and bubbles on its surface.

  2. Description of the Related Art Porous plates having irregularities and bubbles on the surface are known as architectural plate materials used for building walls and the like. As one kind of the porous plate, there is an ALC plate (Autoclave light-weight concrete). The surface of such a porous plate has been subjected to a coating treatment in order to improve the appearance and waterproofness.

  Conventionally, a porous plate used for a balcony or the like has been subjected to double-sided coating on the front and back surfaces because both surfaces of the porous plate come into contact with human eyes.

  Hereinafter, a conventional double-side coating method for a porous plate will be described with reference to FIG. The porous plate 1 has a front surface 2 (design surface) on which a concavo-convex pattern is formed and a flat back surface 3 on which a concavo-convex pattern is not formed, while carrying this on a transporting roller 4. The surface 2 and the back surface 3 are sequentially coated by passing through the processing apparatus in each step.

  First, the porous plate 1 is placed on the transfer roller 4 with its surface 2 facing upward, and is carried into a preheating furnace and preheated. (Preheating step) Next, the porous plate 1 carried out from the preheating furnace is carried into the coating machine, and spray coating is performed on the surface by spraying the coating material from above. (Surface painting process)

  Next, the porous plate 1 unloaded from the coating machine and coated with the surface is conveyed into a drying furnace, and the porous plate 1 is dried by heating. (First drying step) After this drying step, the porous plate 1 is conveyed into an air cooling device equipped with an air blower and cooled by air blow. (Cooling step) This cooling step is carried out in order to prevent a blocking phenomenon (sticking of the porous plates 1 to each other by a paint) that occurs when a plurality of porous plates 1 are stacked.

  Next, the porous plate 1 carried out from the air cooling device is turned over on the conveying roller 4. (Reversing Step) Next, the back surface of the porous plate 1 with the back surface facing upward is painted using a coating roller. (Backside coating step) Thereafter, the porous plate 1 on which the backside coating has been applied is carried into a drying furnace and dried by heating the porous plate 1. (Second drying step)

JP 2005-349248 A

  However, in the conventional double-sided coating method for porous plates, two drying steps (first and second drying steps) have to be performed, and a dedicated drying furnace has to be installed for each. Therefore, there was a problem that the number of processes and facilities were large.

  Further, since the cooling step is performed immediately after the drying step, the porous plate 1 has to be cooled from a high temperature state, and there is a problem that the energy efficiency is poor.

The double-sided coating method of the porous plate of the present invention is a porous plate in which the front surface and the back surface are sequentially coated while the porous plate having a concavo-convex pattern and a flat back surface is transported on a transport roller. In the double-sided coating method of the plywood, a preheating step in which the porous plate is transported into a preheating furnace with its surface facing up and preheated, and after the preheating step, a paint is sprayed on the surface of the porous plate A surface coating process for coating the surface by the above, a drying process for transporting the porous board into a drying furnace after the surface coating process, and drying the porous board by heating, and a cooling process immediately after the drying process The porous plate is turned upside down on the conveying roller without coating, and the back surface of the reversed porous plate is coated using a coating roller, and after the back surface coating step, the porous Plywood A cooling step of cooling by air blow, and in addition to promoting cooling of the porous plate for preventing blocking phenomenon by the paint applied in the back surface coating step, the porous plate after the drying step The paint applied in the back surface coating process is dried by residual heat.

  According to the present invention, since the drying process only needs to be performed once, the double-sided coating process of the porous plate can be rationalized. Moreover, according to this invention, cooling of the porous board 1 for preventing a blocking phenomenon is accelerated | stimulated with the coating material apply | coated by back surface coating, and energy efficiency can be improved.

It is a figure which shows the double-sided coating method of the porous board in embodiment of this invention. It is a figure which shows the double-sided coating method of the porous board of a prior art example.

  Hereinafter, the double-sided coating method of the porous board in embodiment of this invention is demonstrated based on FIG.

  The porous plate 1 has a front surface 2 (design surface) on which a concavo-convex pattern is formed and a flat back surface 3 on which a concavo-convex pattern is not formed. While the porous plate 1 is transported on the transport roller 4, the processing equipment of each step is continuously passed through and the front surface 2 and the back surface 3 are sequentially coated.

  First, the porous plate 1 is placed on the transfer roller 4 with the surface 2 facing upward, and is loaded into a preheating furnace and preheated to a temperature of 40 ° C to 60 ° C. (Preheating step) Next, the porous plate 1 carried out from the preheating furnace is carried into a coating machine, and spray coating is performed on the surface by spraying a coating material from above using a spray nozzle. (Surface coating step) By this spray coating, a coating film can be formed on the uneven portion of the surface 2 of the porous plate 1.

  Next, the porous plate 1 unloaded from the coating machine and subjected to surface coating is conveyed into a drying furnace, and the porous plate 1 is heated to a temperature higher than that during preheating and dried. (Drying step) The steps so far are the same as the coating method of FIG.

  In the coating method of this embodiment, immediately after the drying process, the porous plate 1 is turned over on the transport roller 4 instead of performing the cooling process as in the prior art. (Turn-up process) This turn-up process is performed on the conveying roller 4 using an automatic machine. For example, the automatic machine turns the porous plate 1 upside down by holding one end of the porous plate 1 and lifting and lowering the other end. Then, the back surface of the porous plate 1 turned over using a coating roller such as a roll coater is painted. (Back side painting process)

  By carrying out like this, cooling of the porous board 1 for preventing a blocking phenomenon is accelerated | stimulated with the coating material apply | coated by back surface coating, and energy efficiency can be improved. Moreover, there exists an effect which dries the coating material apply | coated to the back surface of the porous board 1 by back surface coating by the residual heat of the porous board 1 after a drying process.

  After this back surface coating, the porous plate 1 is transported into an air cooling device equipped with an air blower and cooled by applying air blow to the porous plate 1. (Cooling step) In this case, an air blower is arranged above the back surface of the porous plate 1 so that the air blow directly hits the back surface of the porous plate 1, but the air passage so that the air blow wraps around the surface of the porous plate 1. Is preferably formed.

  By this cooling step, the porous plate 1 can be further cooled, and the back surface of the porous plate 1 on which the back surface coating has been applied can be sufficiently dried. In this case, as described above, since the porous plate 1 has already been cooled to some extent by the paint applied by the back surface coating, the load of the air cooling device is reduced, and the energy efficiency can be improved.

  Thus, according to this embodiment, the drying process is completed only once, the process can be rationalized, and a sufficient drying / cooling effect can be obtained, so that high-quality double-sided coating can be realized.

DESCRIPTION OF SYMBOLS 1 Porous board 2 Front surface 3 Back surface 4 Roller for conveyance 5 Roller for coating

Claims (1)

In the double-sided coating method of the porous plate that sequentially coats the front surface and the back surface while carrying the porous plate having the uneven surface and the flat back surface on the transfer roller,
A preheating step in which the porous plate is preheated with its surface facing up in a preheating furnace;
After the preheating step, a surface coating step of coating the surface by spraying a paint onto the surface of the porous plate;
After the surface coating step, the porous plate is transported into a drying furnace, and the porous plate is dried by heating,
Without performing a cooling step immediately after the drying step, the porous plate is turned over on the conveying roller, and the back side of the reversed porous plate is coated using a coating roller, and
A cooling step of cooling the porous plate by air blow after the back coating step, and promoting cooling of the porous plate for preventing a blocking phenomenon by the paint applied in the back coating step In addition, the double-sided coating method for a porous plate , wherein the paint applied in the back surface coating step is dried by residual heat of the porous plate after the drying step .

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