JP4237016B2 - Method for processing porous plate and cleaning device therefor - Google Patents

Description

  The present invention is a pretreatment for applying a waterproof paint on the surface of a porous plate having irregularities or bubbles on the surface (for example, lightweight cellular concrete, hereinafter also referred to as an ALC plate or an ALC outer wall material). The present invention relates to a porous plate processing method for cleaning an ALC plate and a cleaning apparatus therefor.

  Conventionally, there are many exterior walls to be constructed at the construction site, such as dirt walls that have been painted with soil, etc., but the exterior wall materials are produced at factories and the like, and this exterior wall material is attached to the exterior wall portion of the building. The outer wall has become widespread because it has good workability, is homogeneous, and can be constructed with good appearance.

  As the outer wall material produced in the factory, there are an outer wall material made of ALC (Autoclaved Light-weight Concrete), an outer wall material made of precast concrete, an outer wall material made of hard wood cement board, and the like.

  In particular, many ALC outer wall materials are produced because they are similar in appearance to precast concrete outer wall materials and are light and easy to construct. And as an outer wall material of a building such as a house, the one provided with an uneven pattern which has been deeply dug recently is preferred by the construction owner because the appearance is gorgeous.

  In such an outer wall material, a coating is usually applied to the surface in order to improve the appearance and prevent moisture from being absorbed.

  At this time, since the ALC powder adhered to the surface of the ALC plate, it was necessary to remove the ALC powder before the coating process. The reason is that if ALC powder is applied to the surface while the ALC powder is applied, the powder will be mixed with the paint and its viscosity will increase. In addition, since the viscosity of the paint increases in this way, if the operator adjusts the paint so that the viscosity is lowered by adding water, the characteristics (property) of the paint will deteriorate, and as a result, the paint state will be deteriorated. This is because the problem of getting worse occurs.

  Therefore, conventionally, the ALC powder was blown off by air. However, in the removal method using air, ALC powder scatters, and there is a problem with respect to the environment including adverse effects on surrounding workers.

  Therefore, the present inventor has considered adopting a method in which ALC powder is washed away by a shower or the like.

As a pretreatment for coating the surface of the ALC plate, a technique for wetting the surface of the ALC plate with water is described in, for example, the following patent documents.
JP 2000-44365 A

  In the prior art described above, the surface of the ALC plate has only been wetted in advance in consideration of the adhesion of the ALC plate during painting.

  However, as described above, the ALC powder adheres to the surface of the ALC plate, and unless the ALC powder is sufficiently washed away, the appearance of the coating process in the subsequent coating process is deteriorated. Further, it takes a lot of time and water to wash away the ALC powder sufficiently, resulting in a problem that the cost increases and the working time becomes longer.

  For this reason, this invention solves the problem mentioned above, and provides the processing method of the novel porous board which improved the washing | cleaning capability with respect to the surface of an ALC board, and its washing | cleaning apparatus.

In view of this, the porous plate processing method of the present invention includes a plurality of injection nozzles provided substantially in the center and a cleaning device provided with a pair of air injection ports positioned before and after the plurality of injection nozzles. The surface of the porous plate from the injection nozzle while blowing air to the surface of the porous plate by the pair of air jets from the front-rear direction along the conveying direction of the porous plate A first step of spraying washing water on the surface, a second step of heat-treating the porous plate after the first step, and a coating on the surface of the porous plate after the second step And a third step of performing the above.

In the method for treating a porous plate, the washing water sprayed in the first step is filtered and reused as washing water again.

In addition, the porous plate cleaning apparatus of the present invention includes a transport roller for transporting the porous plate, a plurality of spray nozzles provided substantially at the center, and a pair of air aligned before and after the plurality of spray nozzles. An air outlet from the jet nozzle to the surface of the porous plate from the front and rear along the direction in which the porous plate is transported by the transport roller. The cleaning water is jetted onto the surface of the liquid.

The porous plate cleaning apparatus may further include a recovered cleaning water filtration system that recovers and filters the cleaning water sprayed from the spray nozzle and reuses it as cleaning water again.

  According to the processing method and the cleaning apparatus of the porous plate of the present invention, the porous plate surface (for example, ALC powder) can be sufficiently washed away with no extra water and time for the porous plate surface. The cleaning ability can be improved. And it becomes possible to give a favorable coating to a porous board by performing a heat processing and a coating process following a washing process.

  Hereinafter, the processing method of the porous board of one embodiment of the present invention and its washing device are explained in full detail, referring to drawings.

  FIG. 1 is a perspective view showing a porous plate cleaning apparatus 1 according to the present invention, and FIG. 2 is a flowchart showing processing steps from a carrying-in step of an ALC plate 3 to a coating step.

  As shown in FIGS. 1 and 2, in the loading step S1, the ALC plate 3 is loaded from the direction of the arrow in FIG. The cleaning process is performed at Reference numeral 4 denotes a hood of the cleaning apparatus 1.

  An air supply system for blowing air to the ALC plate 3 is prepared near the entrance of the cleaning device 1. That is, by the rotation of the blower fan 6 that is rotated by the blower motor 5, the air inside and outside the cleaning device 1 is sucked through the suction port dust filter 7 and is sent to the air supply pipe 8 through the air suction hose HS, and is further branched. Air is blown onto the surface of the ALC plate 3 from the air jets 10 and 10 through 9 and 9. Reference numerals 11 and 11 denote air volume adjusting dampers provided at the junctions between the branch pipes 9 and 9 and the air jets 10 and 10, and the air volume can be adjusted by adjusting the lever position.

  Further, a surplus air exhaust device 14 that exhausts surplus air via a suction amount adjusting damper 12 and a surplus air exhaust filter 13 is provided behind the branch pipes 9 and 9. HF is an exhaust filter.

  A plurality of injection nozzles 15 are provided substantially at the center of the cleaning device 1, and the air injection ports 10, 10 are aligned at a predetermined interval before and after the injection nozzles 15. Accordingly, during the cleaning operation, the cleaning water from the plurality of spray nozzles 15 is showered on the surface of the ALC plate 3 while air is blown from the front and rear directions along the transport direction of the ALC plate 3 by the air outlets 10 and 10. Is injected into the shape. In this way, by blowing air from before and after the cleaning work position, the cleaning water is collected in the central portion of the cleaning portion by the wind pressure of the air, so that the cleaning portion of the ALC plate 3 can be cleaned accurately. it can. Further, the washed water after washing is collected by a collected washing water filtration system described later so that excess moisture does not remain on the ALC plate 3 due to wind pressure.

  A tap water tap 16 supplies cleaning water into a recovered cleaning water filtration tank 17 as a recovered cleaning water filtration system. The accumulated cleaning water is pumped up by the pump 18 and is sprayed from the spray nozzle 15 onto the surface of the ALC plate 3 through the cleaning water supply pipe 19. At this time, by blowing air from the air jets 10 and 10 provided before and after the injection nozzle 15, the cleaning water can be prevented from being dispersed, so that the cleaning ability can be improved.

  Reference numeral 20 denotes a recovery pipe that recovers the recovered cleaning water 21 from which the ALC powder on the surface of the ALC plate 3 has been washed away, and sends the recovered cleaning water 21 into the recovered cleaning water filtration tank 17. In this recovered cleaning water filtration tank 17, the ALC powder 22 mixed with the recovered cleaning water 21 is deposited and accumulated at the bottom thereof, and the recovered cleaning water is repeatedly reused as cleaning water after repeated filtration.

  The ALC plate 3 cleaned by the cleaning device 1 is transported to a coating device (not shown) via the transport roller 2, and the ALC plate 3 is coated with paint. That is, after the heat treatment in the heating step S3 shown in FIG. 2, the coating is performed in the painting step S4. This coating step S4 is performed, for example, by a method of pressurizing and spraying paint onto the surface of the ALC plate 3 using an injection nozzle.

  Through the above steps, the cleaning and coating process of the ALC plate 3 is completed. Here, in the present invention, the ALC plate 3 that maintains a desired amount of water is prepared by spraying cleaning water once onto the surface of the ALC plate 3 and blowing off excess cleaning water with air. Generally, it is said that if the water content is 20% or more, the coating condition is improved.

  FIG. 3 and FIG. 4 are diagrams schematically showing the mechanism of the coating condition of the ALC plate 3 at the low moisture content and the standard moisture content.

  FIG. 3A shows a cross section of bubbles on the surface of the ALC plate 3, and when the ALC plate 3 having a low moisture content (moisture content of less than 20%) is preheated, the water vapor is converted into a base material as shown in FIG. A large amount erupts from inside. In this state, when the paint is blown and air blown to coat the surface of the ALC plate 3 (the bubbles are sealed), the steam blowing force has a temperature difference as shown in FIG. (The magnitude of the arrow in the figure represents the difference in magnitude of the force.) Therefore, foaming and bubble breaking occur, and the coating on the bubbles becomes incomplete as shown in FIG. At this time, the higher the plate temperature before coating, the greater the amount of water vapor jetted, and the above phenomenon is likely to occur. At this time, even if the paint enters into the bubbles, the capillary action is difficult to work, so that the further penetration of the paint into the ALC plate 3 is also poor.

  FIG. 4 (A) also shows a cross section of bubbles on the surface of the ALC plate 3, and when the ALC plate 3 having a standard moisture content (water content of 20% or more) is preheated, water vapor is generated as shown in FIG. 4 (B). Spout from inside the substrate. However, at this time, moisture slowly moves to the plate surface by capillary action and evaporates. In this state, when the paint is sprayed and air blown to coat the surface of the ALC plate 3 (the air bubbles are sealed), as shown in FIG. Becomes stronger than the steam ejection force (the size of the arrow in the figure represents the difference in the magnitude of the force). Therefore, the paint enters the bubbles, and the coating on the bubbles is performed well as shown in FIG. At this time, the paint further penetrates into the ALC plate 3 by capillary action.

  As described above, in the present invention, it is possible to improve the cleaning ability for the surface of the ALC plate without taking excessive water and time to sufficiently wash away the ALC powder on the ALC plate 3. Moreover, even if the moisture content in the ALC plate fluctuates depending on the humidity and season in the factory, water is once applied to the surface of the ALC plate 3, and excess water is blown away with air to remove the ALC plate. Since the surface of No. 3 is always maintained at an appropriate amount of water, it is possible to perform a good painting operation without any coating unevenness in the subsequent painting process.

It is a perspective view which shows the washing | cleaning apparatus of the porous board of this invention. It is a flowchart which shows from the carrying-in process of the porous board of this invention to a coating process. It is a figure which shows typically the mechanism of the coating condition of the coating material in the low moisture content of a porous board. It is a figure which shows typically the mechanism of the coating condition of the coating material in the standard moisture content of a porous board.

Explanation of symbols

1 Cleaning device 2 Transport roller 3 Porous plate (ALC plate)
6 Blower fan 10 Air outlet 15 Injection nozzle 17 Recovery washing water filtration tank 18 Pump

Claims (4)

A porous plate is carried into a cleaning apparatus provided with a plurality of injection nozzles provided at substantially the center and a pair of air jets aligned before and after the plurality of injection nozzles, and the transport direction of the porous plate A first step of spraying cleaning water from the spray nozzle onto the surface of the porous plate while blowing air onto the surface of the porous plate from the front and rear direction along the pair of air jets ;
A second step of heat-treating the porous plate after the first step;
And a third step of coating the surface of the porous plate after the second step . The method for treating a porous plate according to claim 1, wherein the washing water sprayed in the first step is filtered and reused as washing water again . A transport roller for transporting the porous plate;
Front and rear along a direction in which the porous plate is transported by the transport roller, and a plurality of spray nozzles provided at substantially the center and a pair of air jets aligned before and after the plurality of spray nozzles A cleaning apparatus for a porous plate , wherein cleaning water is sprayed from the spray nozzle onto the surface of the porous plate while air is blown from the air outlet to the surface of the porous plate from the direction . The apparatus for cleaning a porous plate according to claim 3, further comprising a recovered cleaning water filtering system that recovers and filters the cleaning water sprayed from the spray nozzle and reuses it as cleaning water again .

Images