JP2608478B2 - Dry drying method for undried tile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a flat roofing of a green tile, which is recently widely used in a tile manufacturing process, and is performed by horizontally setting a green tile on a drying table. Drying process.

(Prior art) The method of drying undried tiles in a flat state has less distortion and cracks caused by the drying process as compared with the traditional so-called vertical drying method, so that a product excellent in quality can be obtained. Therefore, it is rapidly spreading in the industry recently.

Usually, the drying process of the green tiles is performed by mounting the green tiles on a pallet for flat roof tiles in a substantially horizontal state.

However, although there is an advantage in drying an undried tile in a flat state, it is a fact of the industry that there are many unsolved problems unlike traditional vertical drying methods.

When the undried tile is dried with hot air in a drying furnace, there is an inherent problem that has not been experienced in the past in the dry state.

The difference in shrinkage must be taken into account because the soft undried roof tile containing moisture shrinks by about 15% with the drying process even in the flat state.

Then, regarding the morphological change due to drying shrinkage, it is necessary to consider the inherent problem associated with the flattening drying treatment.

This means that, in other words, the undried tile material before drying shrinks due to the drying process, and the tile product after drying, which has undergone a shape change by the drying process, must immediately change in accordance with the finished tile of the proper shape. Therefore, it is necessary to devise a method for controlling the size and shape of the undried tile and controlling the posture of the undried tile during the drying process.

Therefore, the shape and the size of the undried tile body are naturally different from the shape and the size of the finished tile.

In other words, the size of the green tile must be about 15% larger than the size of the finished tile. Corresponding to the gentle arc-shaped curved part and the curved part of the collar, the pier side of the undried tile is curved to the back side, and the central part is curved gently toward the back side. It is essential that the collar side is gently curved toward the surface side opposite to the crosspiece side.

However, it should be further noted here that the shapes of the curved portions, such as the undried roof tile body and the completed roof tile, are not completely similar to each other.

When dry shrinking, it must conform to the shape of each of the regular curved portions of the finished roof tile.

Therefore, the undried tile material must be formed so that the morphological change due to drying shrinkage is predicted in advance so that the dried tile material conforms to a proper regular shape.

This can be solved by knowing the "dry habit" of the undried tile material accompanying the drying process.

The next problem to be considered is the problem of controlling the horizontal attitude during drying when drying the undried tile.

As described above, the undried tile is horizontally mounted on a pallet for flat roof tile and dried, but in this case, the following points need to be considered in terms of the form of the completed tile.

When drying the undried tile in the flat state, the undried tile basically contracts due to drying, and basically corresponds to the surface form of the pallet provided in accordance with the form of the undried tile. It shrinks and changes in the horizontal direction.

However, in order to obtain a tile tile after drying in conformity with a finished tile which can be used when dried, of course, simply shrinking in the horizontal direction does not solve the problem.

The inventor's research has revealed that although the undried tile is basically dried in accordance with the form of the pallet, there is a slight difference in shrinkage due to the difference in the shape of each part of the tile.

In particular, the collar side of the tiled fabric has a gentle curve as compared to the crosspiece side and the central portion, and therefore, deformation due to drying shrinkage is likely to occur, and a regular collar side shape cannot be obtained.

Therefore, a drying process has been performed in such a manner that the collar side of the pallet is raised to the front surface side in anticipation of a change in form due to drying shrinkage.

For example, in order to solve this problem,
In the device described in the publication, as shown in FIGS. 7 and 8, approximately three pedestals 52 having different heights are provided so as to correspond to the back surface form of the undried tile base material 50.
Are provided, and furthermore, a large number of holes for adjusting member support are arranged on the surface of the receiving table 52, and in order to finely adjust the curvature of the undried tile 50, the adjusting member 56 is attached to these holes, and the adjustment is performed. By performing the drying process by controlling the inclination of the undried tiles 50 by mounting the undried tiles 50 on the members 56 in a flat state, and controlling the posture.

In the invention described in Japanese Utility Model Application Publication No. 56-57806, the low pedestal 58 located at the center is fixed, but the pier-side pedestal 60 supporting the undried tile ground 50 on both sides and the collar side The receiving table 62 is provided so as to be tiltable, and the attitude of the wet tile foundation 50 is controlled by tilting the receiving tables 60 and 62 on both sides (see FIGS. 9 and 10). .

(Problems to be Solved by the Invention) In the former conventional flat drying method of the wet tile material 50, the bottom surface of the wet tile material 50 is arranged on a group of adjusting members 56 according to the type of the wet tile material 50. , By making fine adjustments such as the inclination of the green tile 50, maintaining the green tile 50 in a posture that allows for the morphological change due to drying shrinkage, and drying is performed. 50 can be manufactured with good quality as a tile after drying according to the finished tile.

However, an adjustment member corresponding to the type of wet tile
56 had to be produced in advance, and the exchange work had to be carried out.

On the other hand, with respect to the latter, by tilting the cradle 60, 62 on both sides, there is an advantage that the posture of the undried tile ground 50 can be easily controlled, but there is a disadvantage that the posture control cannot be finely adjusted, and The problem has not been solved because the pallet must be inclined.

The present invention, when drying the undried tiles in a flat state, performing the drying process by mounting the undried tiles on a pallet for the undried tiles in a posture in which the morphological change due to drying shrinkage is planned. The purpose is.

Furthermore, in controlling the posture of the undried tile during the drying process, the pallet is not provided with a mechanism for controlling the position of the undried tile, and the undulating tile itself is provided with a projection for simple posture control. The purpose of the present invention is to simplify the control of the holding posture of the undried tile in the drying process by providing a part.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a flat roofing tile body having a pedestal whose surface morphology substantially follows the bottom shape of the undried tile ground and a ventilation mechanism for hot air circulation. In a method of drying a green tile in a flat state using a pallet, the method comprises forming a green tile having at least one protrusion having a predetermined height at a predetermined position on the back surface. In addition to mounting the undried tile on the pallet for flat tiled foundation, the protrusion of the undried tile is brought into contact with the pedestal of the pallet for flat tiled foundation, so that the undried tile is dried and shrunk. This is a flat drying method for an undried tile, in which a drying process is performed by controlling the change in advance in a predetermined posture.

(Operation) In the drying method of the undried tile body in the flat state configured as described above, the undried tile can be obtained simply by contacting the protrusion on the back surface provided at a certain height with the pedestal of the pallet. Since the posture of the green body can be controlled to a predetermined posture in which the morphological change due to the shrinkage in the drying step is performed, the tile body is dried in accordance with the posture to manufacture a tile body in accordance with the completed roof tile.

(Embodiment) An embodiment will be described with reference to the drawings. As shown in FIG.
When the pallet 12 for flat roof tiles and the undried tiles 10 for drying by mounting the pallets in a flat state and drying are placed on the pallets 12, the curved undried tiles 10 are dried on the pallets 12. In order to be able to dry in a changed posture, it is composed of an undried tile base material 10 having a relatively small protrusion 14 with a predetermined constant height on a part of the back surface.

Although the illustrated example of the undried tile base 10 is a bar tile, the present invention is of course not limited to only a tile, and other than a special tile such as an oni tile, a general tile such as a flat tile, an eaves tile, and a sleeve tile. It can also be applied to traditional roof tiles.

Although the form of the pallet 12 for flat roof tiles is basically the same as that of the conventional art, the pallet 12 is characterized in that the so-called adjusting member 56 is omitted as compared with the pallet 64 of the conventional example.

The pallet 12 of the embodiment is provided so as to correspond to the bottom surface of the most versatile, that is, the so-called cross tile undried tile base material 10.

In particular, it is not necessary to follow the shape of the bottom of a highly versatile tile, but it is easily understood that providing it in accordance with the form of a large number of mass-produced tiles is commercially advantageous. Would.

Therefore, the flat shingle pallet 12 is provided on the base 16 arranged in parallel with the wet tile
And a pedestal 18.

The surface of the pedestal 18 is provided generally in accordance with the back surface form of the tile.

Approximately three of the receiving bases 18 are provided with the undried roof tiles 10 and are provided with a predetermined interval to form the hot-air ventilation mechanism 20 in preparation for drying with hot air.
The pallet 12 for flat roof tile base material is supported on 16.

Also, in order to allow hot air to flow through the cradle 18,
Many ventilation holes 19 are provided.

On the other hand, the undried tile foundation 10 shows a cross tile on the drawing,
A flat protrusion 14 having a preset height of about several millimeters is provided in a square shape in the tolerance direction between the collar side and the butt side.

The form of the protrusion 14 is not limited in principle, but the protrusion 14 has a high flexibility including moisture, as a matter of course, before drying, due to the property of the undried tiled ground 10. Therefore, in the sharp form, the protrusion may be crushed at the time of mounting on the pallet 12, so that it preferably has a certain height as shown, and does not collapse when mounted on the pallet 12. Those having a horizontal surface and having an appropriate area are preferable.

The purpose of the projection 14 is as follows with regard to the tile of the embodiment.
Although the collar side of the wet tile foundation 10 is slightly above the pallet, it is designed so as not to bend downward and deviate from the normal posture.

Of course, the collar side of the undried tile base 10 undergoes a drying shrinkage action during drying and changes its shape. Therefore, the portion having this changed shape conforms to the structure of the collar of the normal shape of the finished tile. The height and position are calculated and calculated.

Therefore, the height and position of the protrusions 14 slightly vary depending on the type of finished roof tile and the type of raw material that undergoes a drying shrinkage action and thus causes a change in the shape.

Therefore, according to the present invention, the undried tile base 10 is mounted on the flat tile base pallet 12 in the flat state, and the projections provided on the back surface of the undried tile base 10 at the time of mounting are described.
14 is brought into contact with the cradle 18 of the pallet 12.

Thus, the undried tile base 10 will be lifted slightly from the cradle 18 with the set portion of the protrusion 14 as a fulcrum,
Since the lifting height and the position are set in advance, the undried tile substrate 10 is controlled to a posture that allows for drying shrinkage.

Note that the size of the undried tile base 10 is formed to be somewhat larger than the size of the pallet 12, and in the case of a cross tile or the like, so-called sharp engaging projections 22 are formed on the bottom surfaces of a pair of butt side ends. The engaging projection 22 does not correspond to the above-mentioned projection 14 which is one of the constitutions of the present invention.

Since the shape of the engaging projection 22 is sharp, there is a possibility that the engaging projection 22 may be clearly crushed when it comes into contact with the cradle 18, and the undried tiled fabric 10 is contracted by the drying treatment as described above. Therefore, it is necessary that the outer peripheral edge of the undried tile foundation 10 protrudes to some extent from the outer edge of the pallet 12.

Because of the shrinkage effect during drying, the peripheral portion of the soft green tile 10 is caught on the cradle 18 and the green tile 10
This is because it damages.

Therefore, the protrusion 14 provided on the back surface referred to in this specification
Is a concept excluding the engagement protrusion 22 described above.

Further, on the back surface of the crosspiece of the embodiment,
Is formed only in the direction of the tolerance of the collar and buttocks, but this is not intended to limit the provision of two or more protrusions, but at least one protrusion in the direction of the tolerance of the collar and buttocks of the undried tile base material 10. The use by which the object of the present invention is achieved by the part 14 is clarified.

FIG. 5 shows a plan perspective view of a state in which three completed tiles 24 are laid. When the completed tile 24 is laid on the roof, the bottom side 26 of the completed tile 24 located on the lower side in the overlapping portion is: It is necessary that the top tile 28 of the completed roof tile 24 located above is in close contact with the roof side 28 to prevent rainfall from entering.

This means that the tail side 26 of the finished roof tile 24 must not be curved so as to warp toward the back side.

Therefore, it can be understood that the purpose is to provide the protrusions 14 in the tolerance direction between the bottom of the undried tile base 10 and the collar and to control the posture so that the undried tile base 10 is lifted from the cradle 18.

On the other hand, if a protrusion is provided in the direction intersecting the head side 28 and the collar side 30 of the undried tile base 10, the butt side 26 will be provided by the height of the protrusion.
As a result, a gap is formed between the tail side 26 and the head side 28 of the completed roof tile 24, thereby causing rainfall to enter.

Further, by providing the protrusions 14 at the above-described positions, care is taken so that the protrusions 14 do not hinder the use of the finished roof tile 24.

Referring to FIG. 6, when the finished tile 24 is superimposed, the collar side is located below the crossing side of the adjacent finished tile 24.

And in this case, since the collar side having the protruding portion 14 is inserted upward below the crossing side of the adjacent completed tile 24,
As a result, a certain space is formed below the protrusion 14 so that the protrusion 14
Is not an obstacle.

(Effects of the Invention) In this case, since the above configuration is adopted, the following advantages are obtained.

A simple means of providing a projection with a certain height on a part of the back surface when forming the green tile is used to make the projection abut on the pallet of the flat roof tile base. The pallet can be mounted on the pallet in such a manner that the posture at the time of drying can easily correspond to a change in form due to drying shrinkage.

Therefore, the attitude control of the undried roof tiles during drying can be achieved by changing all the pallets without changing the pedestals or mounting a large number of adjustment members on the pedestals, and by only partially processing the pallets in the tile mold. Since it became possible by providing protrusions on the surface of the tile body, even if there is a change in the viscosity of the raw material or a change in the shape of the tile, the drying operation can be performed extremely easily as compared with the conventional drying method. .

Further, unlike the method of inclining the cradle, the height of the protrusion of the undried tile can be set in advance and provided on the basis of a numerical value, so that fine adjustment accompanying the posture control on the pallet is not required. .

[Brief description of the drawings]

1 is a plan view of the present invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a perspective view of the back surface of the tile according to the embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along the line B, FIG. 5 is a plan perspective view when the completed tile is laid, FIG. 6 is a front view of FIG. 5, FIG. 7 is a plan view of the prior art, and FIG. FIG. 9 is a front view of another prior art, and FIG. 10 is a side view of the pallet for flat roof tiles of FIG. (Explanation of symbols of main parts) 10: Undried tile 12: Pallet for flat roof tile 14: Projection 18: Cradle 20: Ventilation mechanism

Claims (1)

(57) [Claims] 1. A method for drying an undried tile in a flat state using a pallet for a flat tile base having a receiving surface and a ventilation mechanism for hot-air distribution, the surface aspect of which roughly follows the shape of the back surface of the undried tile. In, at a certain position on the back surface of at least one protrusion having a predetermined height is formed to form an undried tile, and the undried tile is mounted on a pallet for flat roof tile. At the same time, the protrusion of the undried tile is brought into contact with the pallet of the flat shingle pallet, whereby the undried tile is preliminarily controlled to a posture in which a morphological change due to drying shrinkage is expected to be performed, and the drying process is not performed. Drying method for dry tiled tiles.