JPS58194506A - Manufacture of large-sized vessel made of china - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention relates to a new method for manufacturing pottery such as pots and bottles by pour molding, and in particular, uses a horizontally split multi-stage plaster mold to produce large pots, which were previously considered impossible. The present invention relates to a method for manufacturing a large ceramic container using a horizontally split multi-stage plaster mold that allows objects such as pots and bottles to be easily displayed.

The pour molding method that utilizes the water absorption properties of plaster molds is generally known, but conventional plaster molds were intended for relatively small pottery such as tea bowls and vases, and were vertically split.
The weight and size of the plaster mold are obstacles to the manufacture of large pots and bottles, and it is difficult to remove the mold, and even if the mold can be removed, it may damage the molding base soil and the plaster mold. It was considered impossible to make large ceramic containers using vertically split plaster molds.

The present invention uses a horizontally divided multi-stage plaster mold, in which the plaster mold is divided into multiple stages in the horizontal direction, to make it possible to easily manufacture large pots, bottles, etc., which had previously been considered impossible. The object of the present invention is to provide a method for manufacturing large containers.

Hereinafter, a specific configuration of the present invention will be explained in detail based on illustrated embodiments.

The method of the present invention is a method for manufacturing a large pottery container with a narrow mouth and a round body, such as a pot or bottle, using a plaster mold, and the plaster mold is divided horizontally into multiple stages. do,
At least a lower mold 1 with a bottom, a middle mold 2 whose upper part is the maximum diameter of the body of the large container, an upper mold 3 forming the upper surface of the large container, the lower mold 1, and the middle mold. 2 and -
After assembling the first-stage molds 3 one after another, a suitably mixed slurry is poured into the opening 4 of the upper-stage mold 3, and after leaving it for an appropriate period of time, a layer 6 of base soil is formed on the inner wall surface 5 of the plaster mold to a predetermined thickness. After confirming that the mold is formed, excess slurry 12 inside the plaster mold is pumped out of the mold using a pump, etc., and after the molding base soil 7 has hardened to some extent as it dries, the upper mold 3 is moved to the workshop. Using a chain block or the like installed on the ceiling of the room, pull it out upwards, wait for the molded base soil body 7 to harden, and then pull out the Nakao step mold 2 and the molded base soil body 7 upward together. Then, the mold is removed from the lower mold 1, and the molded base soil body 7 with the middle mold 2 still attached is placed on the upper surface of the rootstock 8, and the middle mold 2 is lowered below the rootstock 8. The molded base soil body 7 is removed from the mold, and the thus obtained molded base soil body 7 is heat-treated by a conventional method.

Figure 1 shows the assembled state of the lower mold 1, the middle mold 2, and the upper mold 3, which are divided into three stages. Of course, it may be of a multi-stage type divided in directions. The lower mold 1 has a bottom and forms the bottom of a large container to be molded, and the middle mold 2 forms the body of the large container. In addition, the upper part of this middle mold 2, especially the vicinity of the part where it fits with the lower part of the single stage mold 3, is formed to have the maximum diameter of the body of the large container to be molded so that demolding can be easily performed.
11, and the lower part of the middle mold 2 has a smaller diameter than the upper part. In addition, on the contact surface of each stepped mold 1.2.3, as shown in FIGS. 2 and 3, a pair of convex portions 9 and a concave portion 1
0 is formed so that it can be fitted and the position will not shift when the plaster mold is assembled.

Figure 4 shows the state in which slurry is injected into the assembled plaster mold from the opening 4 of the upper mold 3.The slurry 12 absorbs moisture over time and forms on the surface of the plaster mold. A layer 6 with low moisture is formed in the contact area, and when this layer 6 reaches a predetermined thickness, the remaining slurry 12 inside the mold is drained out of the mold, and if left for a while, the plaster mold can be molded. Base material ±7
As it absorbs moisture, it will eventually shrink and release from the mold. Therefore, the upper mold 3 is lifted upward to be demolded. Since the upper mold 3 has a large diameter at the lower part and a small diameter at the upper part, it can be demolded more easily than the molding base body 7.

Fig. 5 shows a state in which the upper mold 3 has been removed and the upper surface of the molding base body 7 is exposed.In this state, the molding base body 7 is further dried, and when it has hardened, the molding base body 7 is removed using a chain block or the like. The soil body 7 and the middle mold 2 are pulled upward together.

As described above, since the upper part of the middle mold 2 has a large diameter, the middle mold 2 can be easily pulled up while holding the molding body 7. By this operation, the lower mold l can be separated from the molding base body 7. In addition, it is preferable to cut an annular groove 11 into the outer periphery of the middle mold 2 and fit a band thereto to use as a handhold when pulling up with a chain block or the like.

Figure 6 shows a state in which the molding base body 7 is placed on the L side of the rootstock 8 with the middle mold 2 attached, and after it is left still, the middle mold 2 is pulled down and the It is completely removed from the mold by being placed under the legs of the person.

Next, the demolded molded base body 7 is fired in a conventional manner to obtain a large pottery container.

The method of the present invention has the above-mentioned configuration, and it has become possible to easily manufacture large ceramic pots, bottles, etc., without difficult work, which has been considered impossible by conventional casting methods. In addition, since the plaster mold is made into a horizontally divided multi-stage type, demolding is easy and drying is accelerated, and the parting line that occurs at the joint of the molds is formed in the horizontal direction, which is comparable to that using a potter's wheel. It has the advantage of providing a good texture and requiring almost no post-treatment.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the assembled plaster mold, Figure 2 is a bottom view of the upper mold, Figure 3 is a plan view of the middle mold, and Figure 4 is a cross-sectional view of the plaster mold with slurry poured into it. , FIG. 5 is a sectional view showing the upper mold removed, and FIG. 6 is a front view showing the middle mold removed. 1. Lower mold 2. Middle mold 3. Upper mold 4. Opening part 5.
・Inner wall 6... Layer 7... Molded base soil body 8... Stand Wood 9... Convex part
10...Concave portion 11...Concave groove 1
2. Sludge patent applicant Kuroiwa Togo Figure 5

Claims (1)

[Claims] A method for manufacturing a large pottery container, such as a pot or bottle, with a narrow mouth and a swollen body using a plaster mold,
The plaster mold is divided into multiple stages in the horizontal direction to form at least a lower stage mold with a bottom, a middle stage mold whose part has the maximum diameter of the body of the large container, and an upper stage forming the upper surface of the large container. mold and pear,
After assembling the lower mold, middle mold, and upper mold in sequence, pour the slurry through the opening of the upper mold, and leave it for a suitable time. After that, a layer on the base material is formed on the inner wall of the plaster mold to a predetermined thickness. After that, the remaining slurry inside the plaster mold is discharged, and after the molding base soil has hardened to some extent, the upper mold is pulled out upwards, and then the middle mold is pulled upward together with the molding base soil body, and the lower mold is removed. The mold is removed from the mold, and the molded base soil is placed on the upper surface of the script with the middle mold still attached, and the middle mold is lowered under the script, and the mold is removed from the molded base soil. A method for producing a large pottery container, characterized by heat-treating the obtained molded base soil body by a conventional method.