JPH0513705U - Press molding machine for accessory tile molding - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the mold separation between the molding die and the green body, and to enable even the accessory tiles to be embossed. [Structure] A Teflon coating layer is provided on the molding surface of a molding die. [Effect] The mold separation between the mold and the green body is improved,
Further, the tile forming clay becomes difficult to adhere to the forming surface. Therefore, even when the accessory tile is pressed on the surface, the stress of demolding expansion does not locally concentrate on the accessory tile, and cracks are not generated. Therefore, it becomes possible to unify the surface properties of the flat tiles and the accessory tiles, and the unified harmony of the entire wall surface of the building can be achieved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a press molding machine for accessory tile molding in which a Teflon coating layer is provided on the molding surface to improve the mold separation between the molding green body and the molding mold after pressure molding. ..

[0002]

[Prior Art]

 Usually, when the flat tile 1 as shown in FIG. 3 is formed, the tile surface 1a is made the upper surface and pressure forming is performed. Such a molding method is called front pressing. The reasons for pushing the table are as follows. That is, the tile surface 1a needs to be facing upward because it is necessary to apply glaze in the glaze process performed after pressure molding. In addition, in the firing process performed after glaze, the tiles are placed in a sagger and fired, and alumina is usually applied to the baking stand to prevent the tiles from sticking to each other. Therefore, if the tile surface 1a faces downward, the alumina adheres and the properties of the tile surface change, and in this case also, the tile surface 1a needs to face upward. As described above, in the glaze and baking steps after pressure molding, it is necessary to face the tile surface 1a upward. However, when pressure molding is performed with the tile surface 1a facing downward (pressing back), pressure is applied. This is because a step of inverting the front and back surfaces of the tile is required after molding, which increases the number of steps by one and reduces production efficiency.

When the flat tile 1 having, for example, a speckled pattern is formed by such surface pressing, as shown in FIG. 3, normally, the speckled pattern is concentrated and darkened on the tile back surface 1b side due to segregation. The tile pattern 1a tends to have a thin speckled pattern. On the other hand, in the case of back pressing, since the molding space is filled with a kneaded material of uniform thickness and pressure molding is performed with the upper mold having the uneven portion for molding the back foot, the space between the back foot and The filling density of the kneaded material with the concave portion changes (the filling density becomes higher in the concave portion), the thermal expansion / contraction behavior during firing is partially transmitted, and the product shape may deteriorate. There is.

By the way, in order to form an accessory tile to be attached to a corner portion of a building in order to unify the speckled pattern with the above-mentioned flat tile 1 of the surface push, as shown in FIG. It is necessary to push the accessory tile 4 as well. However, when the accessory tile 4 is pushed on the surface, the accessory tile 4 tries to open outward as shown by the arrow in FIG. Due to its good property, the phenomenon that it is released from the mold while being in close contact with the upper mold 6 occurs. Therefore, the movement of the surface 4a of the accessory tile 4 is constrained by the close contact with the upper die 6, and the behavior of demolding expansion causes the accessory tile 4 to slide downward and expand. As a result of the concentration of stress on the central portion of the back surface of the above, there was a defect that cracks 5 were generated in this portion. Also, since the adhesion to the upper mold 6 is good, the green body after molding remains in close contact with the upper mold 6, and the defect that the mold cannot be removed, and the molded green substrate falls after the upper mold 6 moves up. It had the drawback of being damaged. Furthermore, when forming a fine concavo-convex pattern 7 on the surface of the accessory tile 4 for surface pressing, the molding surface 6a of the upper mold 6 must be a fine concavo-convex surface. However, when the surface is finely uneven, there is a drawback that the concave portion is clogged with the kneaded material for tile forming during pressure forming, and the uneven pattern 7 cannot be formed on the surface of the accessory tile 4.

Therefore, in the prior art, when the accessory tile is formed, as shown in FIG. 5, the accessory tile 8 is formed by back-pressing with the surface 8a of the accessory tile 8 facing downward. Was there. 4 and 5, 9 is a lower mold, 10 is a frame mold, and 11 in FIG. 5, 11 is a dust box for filling the kneaded clay.

[0006]

[Problems to be solved by the device]

 By the way, when molding tiles, the surface texture differs between front and back pressing, and in the case of tiles with speckled patterns in particular, the speckled pattern tends to concentrate on the lower surface side during molding. The fact that there is is as described above. Therefore, since the conventional flat tile 1 is a front embossing, the speckled pattern appears dark on the tile back surface 1b side, and the accessory tile 8 is a back embossing, so the speckled pattern appears dark on the tile front surface 8a side. Therefore, the conventional flat tile 1 and the accessory tile 8 have different shades of the speckled pattern, and when this is applied, the speckled pattern varies between the flat part and the corner part of the building, resulting in the building as a whole. There was a serious drawback in that the speckled patterns could not be harmonized in a unified manner.

[0007]

[Means for Solving the Problems]

 SUMMARY OF THE INVENTION The present invention has been improved and eliminated in view of the above-mentioned problems of the related art, and provides a press molding machine with good mold release of a forming green body that can be pushed even in the case of accessory tiles. It is something to do.

[0008] The means adopted by the present invention to solve the above-mentioned problems are, in a press-molding machine for press-molding accessory tiles, attachment of the tile raw material to the molding surface of the molding die. This is a press molding machine for tile molding, which is provided with a Teflon coating layer for preventing the above.

[0009]

[Action]

 A Teflon coating layer is formed on the molding surface of the press molding machine of the present invention, and the mold release from the molding surface of the molding base after pressure molding is improved. Therefore, even when the accessory tiles are pushed up, the molding base when the upper mold is raised will remain in the lower mold, and even if demolding expansion occurs in the molding base, its behavior will be Since it acts on the entire substrate, stress is not locally concentrated and cracks do not occur. In addition, since the mold is released easily and it does not adhere to the kneaded clay for tile forming, it is possible to form a fine uneven pattern on the surfaces of the accessory tile and the flat tile.

Therefore, it becomes possible to push both the flat tile and the accessory tile, and the surface properties can be unified. In other words, it is possible to achieve a unified harmony of the tile patterns on the entire wall surface of the building.

[0011]

[Embodiment] The construction of the present invention will be described below with reference to an embodiment shown in the drawings.

FIG. 1 is a vertical sectional view showing a press molding machine 12 for molding accessory tiles according to an embodiment of the present invention. As shown in the figure, the press molding machine 12 includes an upper mold 13, a lower mold 14, a frame mold 15, and a dust box 16 for filling kneaded clay. This structure is the same in the conventional case. In this press molding machine 12, the molding surface 13 of the upper mold 13 is used to mold the tile surface 18a of the accessory tile 18 (see FIG. 2), and the molding surface 14a of the lower mold 14 is molded. The tile back surface 18b of the accessory tile 18 is formed. In other words, this press molding machine 12 is for surface press molding.

In this embodiment, in the press molding machine 12 for such surface pressing molding, fine irregularities are formed on the molding surface 13a of the upper mold 13, and the Teflon coating layer 17 is formed on the molding surface 13a. Is provided.

In general, Teflon (a product name of polytetrafluoroethylene manufactured by du Pont Co., Ltd.) is characterized by excellent heat resistance and chemical resistance, and a very small friction coefficient. This molding machine 12 utilizes the property that the coefficient of friction of Teflon resin is very small. When the accessory tile 18 is surface-pressed by the upper mold 13 provided with the Teflon coating layer 17, the mold release between the molding base after pressure molding and the molding surface 13a of the upper mold 13 is improved, and the upper mold 13 is The molding base can be lifted alone with the lower mold 14 left. Therefore, the behavior of demolding expansion that occurs in the molding base after the upper die 13 is raised acts on the entire molding base because the upper surface side of the molding base is an open space, and the behavior of demolding expansion depends on the behavior. It does not cause stress concentration. Therefore, the problem that a crack occurs in the molding base of the accessory tile 18 does not occur.

Further, since the Teflon coating layer 17 provided on the molding surface 13a of the upper mold 13 has a very small friction coefficient, the clay for tile molding is less likely to adhere to the teflon coating layer 17, and tiles are formed in the fine recesses formed on the molding surface 13a. There is also an effect that the kneaded material for molding is not clogged. That is, it is possible to form a fine uneven pattern 20 on the surface 18a of the accessory tile 18.

Therefore, in the accessory tile 18 pressed by the press molding machine 12 of the present embodiment, the density of the spot pattern on the tile surface 18a of the accessory tile 18 is the surface 1a of the conventional flat tile 1 shown in FIG. It comes to match the degree of shading of the spot pattern. In other words, it is possible to achieve a unified harmony over the entire wall surface of the building.

By the way, the present invention is not limited to the above-described embodiments, but can be appropriately modified. For example, the Teflon coating layer 17 is formed only on the upper mold 13 of the press molding machine for forming the accessory tile to be surface-pressed, but the lower mold 14 can also be formed with the Teflon coating layer. is there. When a fine uneven pattern is formed on the tile surface 1a of the flat tile 1, a Teflon coating layer may be formed on the molding surface of the molding machine for forming the tile surface 1a. Furthermore, the thickness of the Teflon coating layer, the size of the target tile, the pressure molding conditions, etc. may be determined by comprehensively judging these factors.

[0018]

[Effect of the device]

 As described above, in the present invention, the Teflon coating layer having an extremely small friction coefficient is provided on the molding surface of the press molding machine for molding accessory tiles. Therefore, the mold release of the green body after pressure molding is improved. In addition, the tile forming clay becomes difficult to adhere to the forming surface. Therefore, even if the accessory tile is pushed up, the mold release from the upper part of the forming green body causes the demolding expansion behavior of the forming green body to act on the entire forming green body, and the stress is locally applied. There will be no partial concentration. Therefore, no cracks will occur on the accessory tiles that have been pushed up. Further, even if fine irregularities are formed on the molding surface of the press molding machine, the clay for tile molding is not clogged, and it is possible to form fine irregular patterns on the tile surface.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a press molding machine according to the present invention.

FIG. 2 is a vertical sectional view of an accessory tile according to the present invention.

FIG. 3 is a vertical sectional view showing a general flat tile press molding machine.

FIG. 4 is a vertical cross-sectional view of a press molding machine when the accessory tile is pressed on the surface.

FIG. 5 is a longitudinal sectional view of a conventional accessory tile press-forming machine.

[Explanation of symbols]

 12 ... Press molding machine 13 ... Upper mold 14 ... Lower mold 15 ... Frame mold 16 ... Powder box 17 ... Teflon coating layer 18 ... Accessory tile 18a ... Tile surface 18b ... Tile back surface 20 ... Fine uneven pattern

Claims (1)

[Scope of utility model registration request] 1. A press molding machine for press-molding accessory tiles, wherein a Teflon coating layer for preventing adhesion of tile raw material to the molding surface of a mold is provided on the accessory tile. Press molding machine.