JPH0140729B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for forming a sinking pattern on the surface of a molded raw material such as a tile, and an apparatus used in the method.

[Prior Art] Conventionally, the surface pattern of a molded material obtained by extrusion molding is limited to a continuous pattern drawn along the extrusion direction or an irregular pattern stamped in a regulated manner. It was hot. The formation of other patterns was considered impossible due to the structure of the extrusion molding machine, and for this reason, there was no room for developing new patterns at all. .

In view of these circumstances, the present applicant has created a flow-sediment pattern on the surface of the green material, that is, when extruding a forming raw material in which fine grains as a main material and coarse grain raw materials as an auxiliary material are kneaded, the movement of the coarse grain raw material is prevented. He proposed a method of temporarily stopping or delaying the movement of the fine-grained raw material to inscribe its locus on the surface of the green material, thereby forming the depicted image (Japanese Patent Application No. 59-20621, Hereinafter referred to as "first application"
).

In the method of this prior application, fine-grained raw materials as the main material and coarse-grained raw materials as auxiliary materials are uniformly distributed in an extrusion molding machine in which a peeling line for removing the skin layer of the extruded green material is stretched over the exit of the die section. The kneaded raw materials are loaded and extruded, and a flowing and sinking pattern is created on the cut surface of the raw material due to movement resistance caused by the coarse raw materials being caught on the peeling line during extrusion. It was designed to do so.

FIG. 2 is a schematic perspective view showing the outlet of the die portion 1a of the extrusion molding machine 1 used in the method of the prior application. In addition,
In the same figure, the molded raw material 2 is shown as a half-split tile element, and in the figure, 2a shows the surface to be divided, and 2b shows the part that will form the bottom of the tile after the division.

In FIG. 2, the die section 1a of the extrusion molding machine 1
Two peeling lines 6, 6 are stretched parallel to each other so as to cross the upper and lower sides of the extrusion opening surface, respectively. The peeling wire 6 is made of, for example, a piano wire, a PC steel wire, etc., and its fixed structure at both ends is such that one end is locked by a suitable pin 6a and the other end is stretched by a wing nut 8. There is.

The raw materials supplied to this extrusion molding machine 1 include feldspar,
Coarse material 3 having a relatively coarse particle size of, for example, about 5 to 25 meshes is mixed into a fine material (main material) such as clay as an auxiliary material. Then, at the same time as this molding raw material is extruded from the extrusion molding machine 1, the peeling line 6 bites into the upper and lower parts of the molding starting end surface 2d of the extruded molded raw material 2, so that the The skin parts 2c, 2c are cut so as to be exfoliated.

During this cutting, among the coarse grain raw materials 3, the coarse grain raw materials 3 on the planned cutting surface of the peeling line 6 are
The movement is temporarily stopped or delayed by the peeling line 6. As a result, on both surfaces of the formed green material 2 from which both the upper and lower surface skin portions 2c, 2c have been cut and peeled off, a locus is carved in which the coarse grained raw material 3 is reduced into the fine grained raw material 4. A sinking pattern 5 is drawn by this.

[Problems to be Solved by the Invention] In the apparatus shown in FIG. 2, extrusion pressure is applied to the peeling wire 6, so that the peeling wire is stretched and deflected. If the peeling line 6 is bent in a direction perpendicular to the extrusion direction (X direction), the thickness accuracy of the obtained product will be reduced.

Further, due to the deflection in the X direction, arc-shaped deflection traces A remain on the surface of the resulting product, as shown in FIG.

Furthermore, in the apparatus shown in FIG. 2, the peeling wire 6 has low wear resistance, is easily broken during manufacturing, and is frequently replaced. Furthermore, when a peeling wire is used, it is only possible to cut in a straight line, and it is not possible to cut out a curved surface.

[Means for Solving the Problems] The method for forming a flow-and-sink pattern of the present invention includes extruding a kneaded material of a main fine-grain raw material and an auxiliary coarse-grain raw material from an extrusion port of a die part of an extrusion molding machine, and extruding The skin layer of the raw material is removed using a rigid hard plate to form a sinking pattern on the cut surface.

Further, the present invention provides a device for carrying out such a forming method, in which a rigid hard plate is placed on the exit side of the die portion of an extrusion molding machine so that the plate surface is along the extrusion direction, and the hard plate is The present invention provides a sinking pattern forming device, characterized in that at least a part of the leading edge of the die is provided so as to cross an extrusion opening of the die.

[Function] According to the present invention, the skin layer of the green material extruded from the extrusion molding machine is removed by the rigid hard plate to form a sinking pattern.

Since this hard plate has much higher rigidity than the peeling wire, it does not bend during the forming process, making it possible to manufacture a product with excellent thickness accuracy and no bending marks. It is also highly durable. Furthermore, it is possible to remove the epidermal layer in any desired shape.

[Example] The present invention will be described in more detail below with reference to the drawings.

FIG. 1 is a perspective view of a main part of an apparatus for forming a sinking pattern according to an embodiment of the present invention.

In this embodiment, a hard plate is attached to the die portion 1a of the extrusion molding machine 1 by an L-shaped jig 10. Reference numerals 11 and 12 are bolts. Similar to the peeling line shown in FIG. The front edge 9a of the plate 9 is cut and the skin 2c is removed. Also,
The coarse raw material 3 in the green material 2 that is in contact with the leading edge 9a
, whose movement is temporarily stopped or delayed by the leading edge 9a. As a result, a sinking pattern is drawn on both surfaces of the molded raw material 2 from which both the upper and lower skin portions 2c, 2c have been cut and peeled off.

In this embodiment, the hard plate 9 preferably has a triangular or trapezoidal cross-sectional shape, with the front edge 9a being thinner and the rear edge 9b being thicker, as shown in FIGS. That is, by adopting such a shape, it is possible to improve the cutting characteristics on the front edge 9a side, improve the overall strength and rigidity, and reduce the pressure exerted from the green material. In this case, it is usually preferable that the thickness on the leading edge 9a side be 3 mm or less and on the trailing edge 9b side as approximately 4 to 10 mm.

The length of the hard plate 9 in the longitudinal direction is preferably about 1.1 to 1.4 times the opening dimension of the extrusion port in the left-right direction. Further, the width of the hard plate 9 in the extrusion direction is preferably about 10 to 40 mm, and is selected depending on the length in the left-right direction.

As shown in FIG. 3, this hard plate 9 is preferably attached at an angle α such that the rear end 9b side is separated from the product side of the green material 2.

FIG. 6 is a perspective view showing the main parts of an apparatus according to a different embodiment of the present invention. In this embodiment, a hard plate 9 having an arcuate shape in the longitudinal direction is used, and the raw material 2 is formed so that the center side is thicker than the side sides.

Other configurations of the device shown in Figure 6 are shown in Figures 1 and 2.
Since it is similar to the figure, the same reference numerals are given to the same or equivalent members, and the explanation thereof will be omitted.

In addition, in the present invention, in addition to the hard plate curved in an arc shape as described above, a hard plate curved in a corrugated manner may also be used.

In the present invention, it is preferable that the hard plate be made of a high-hardness material that has little wear and is also excellent in strength, corrosion resistance, and the like. Preferred materials include steel (eg, stainless steel, high alloy steel) and ceramic (eg, alumina, silicon carbide). Further, a hybrid material combining two or more materials may also be used. For example, a ceramic material is attached to the leading edge of a steel plate.

In the method of the present invention, various raw materials can be used as long as they contain fine-grained raw materials such as feldspar and clay and coarse-grained raw materials such as staghorn and sand.

Next, a manufacturing example using the embodiment apparatus shown in FIG. 1 will be described.

The mixing ratio of forming raw materials is, first, 40 to 50wt of feldspar.
%, and within each numerical range of 50 to 60 wt% clay,
The total mixture was made to be 100 wt%, and this was designated as fine grain raw material 4 (see Figure 1).

Next, the fine grain raw material 4 is made 80 wt%, and 20 wt% of the coarse grain raw material 3 (see Figure 1) consisting of sand and sand having a particle size of 5 to 25 meshes is added, so that the total mixed raw material is 100 wt%. This is used as a raw material mixture.

Furthermore, the raw material mixture was made 80wt%, and to this,
Add 20wt% of water and knead, and the total kneading becomes 100wt.
% of the molding raw material of the present invention is obtained.

The moisture content of the molding raw material obtained as above is
It was approximately 20-25%.

The extrusion pressure of the molding raw material is 15 kgf/cm ² .

Note that the hard plate 9 has a front edge 9a of 0.5 mm and a rear edge 9 of 0.5 mm.
b has a thickness of 7 mm, and was attached so that the angle α was 15°.

Through this extrusion molding, a green material having a flowing and sinking pattern was obtained. Then, the obtained molded green base was dried at 80℃ for 35 hours and then glazed.
It was baked at ℃ for 40 hours.

The external dimensions of the molded material (divided tile) obtained in this way are 60 mm on the short side and 60 mm on the long side.
300mm, and the thickness was 12mm. and,
The unit flow pattern formed on the surface of the molded material had a length of about 6 to 10 mm and a depth of about 1 to 3 mm.

In addition, the present invention can be applied to various molding materials other than the nosing tile and the split tile, as in the previous application.

[Effects of the Invention] As is clear from the above description, according to the method and apparatus for forming a sinking pattern on a molded raw material according to the present invention, it is possible to improve the product thickness accuracy, eliminate arcuate patterns, and remove members ( Effects such as a drastic reduction in the frequency of replacing hard plates) can be achieved. Therefore, according to the present invention, it is possible to efficiently produce a green material having a flowing and sinking pattern, and the shape of the green material can also be made into a desired shape.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the main parts of the embodiment device;
3 is a side view of the device shown in FIG. 1, FIGS. 4 and 5 are cross-sectional views of the hard plate 9, and FIG. 6 is a schematic diagram of a different embodiment of the device. FIG. 1...Extrusion molding machine, 1a...Dice part, 2...
Molded raw material, 2a... cut surface, 3... coarse grain raw material, 4... fine grain raw material, 5... sinking pattern, 6... peeling line, 9... hard plate, 9a... hard plate front edge .

Claims (1)

[Scope of Claims] 1. Extruding a kneaded product of a main fine-grain raw material and an auxiliary coarse-grain raw material from an extrusion port of a die part of an extrusion molding machine, and
A method for forming a sinking pattern on a cut surface by removing the skin layer of an extruded green substrate, which is characterized in that the skin layer is removed using a rigid hard plate. How to form. 2. Place a rigid hard plate into the extrusion port of the die part of the extrusion molding machine so that the plate surface is along the extrusion direction.
A device for forming a sinking pattern on a molded raw material, characterized in that at least a part of the front edge of the hard plate is provided so as to cross an extrusion opening of the die section.