JPH05300916A - Method for packing high-viscosity gelatinous material - Google Patents

Abstract

PURPOSE:To eliminate the troubles, such as generation of blowholes and change in the materialities of the respective parts of products at the time of casting a gelatinous material having a relatively high viscosity. CONSTITUTION:This packing method consists in adapting a press-fitting cylinder 3 mountably to one side of a molding flask which supports a casting mold, setting the size of a runner to a feed metal basin provided to face this cylinder at the same size or approximately the same size as the size of the cylinder 3, freely slidably inserting a piston piece 7 penetrating a fine feeding runner 8 in the runner and constituting the piston piece 7 in such a manner that the piston piece can be pushed to move by a separately provided hydraulic cylinder, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a certain type of gel-like substance having a relatively high viscosity such as a kneaded resin for producing a denture resin floor and having a hardness increasing with time. The present invention relates to a method for injecting pressure to obtain a desired molded body.

[0002]

2. Description of the Related Art Even when casting with a relatively viscous dough-like substance such as a resin for denture base, a plaster-shaped dough-like smelt having a hot spring and a rising pool like the conventional metal casting has been used. The technique of press-fitting Japanese resin has been widely used.

[0003]

Generally, when a resin denture is prepared, a powdery resin and a solvent (liquid) are kneaded to form a highly viscous dough-like substance, which is supported by a mold called a flask. Although it is injected into the mold at a relatively high pressure, the injection pressure of the injected Renwa resin gradually decreases, and part of it flows into a narrow presser channel and returns to the mold again. However, there was a problem in that air was trapped during this and bubbles were generated between the mold and the mold wall. Further, in the case of using such a conventional method, there is also a problem that the physical properties of each part of the resin floor differ due to differences in the casting distance of the resin, the casting time, etc., and the product yield is reduced.

An object of the present invention is to eliminate the above-mentioned inconveniences such as generation of bubbles and changes in physical properties of various parts of a product when casting a gel material having a relatively high viscosity.

[0005]

In order to achieve the above object, the present invention is mounted on one side of a formwork supporting a gypsum mold,
Accommodating a relatively viscous gel-like substance, the size of the runway to the press sump provided opposite to the cylinder capable of pressure extruding the same, or substantially the same as the cylinder, A means is used in which a piston piece formed by penetrating a thin pusher channel is slidably inserted into the runner and the piston piece can be pushed via a separate hydraulic cylinder or the like. ..

[0006]

According to the present invention, the runway leading to the sump is set to be approximately the same size as the spout, and a piston piece formed by penetrating a narrow pushway is slidably inserted into the runway. Therefore, it has an action of introducing the hot melt into the hot water pool like a normal hot water runner in this type of mold, but when the filling is almost completed, the hot melt flowing into the hot water pool is pressed by the piston piece. By doing so, the internal pressure is applied from both the hot water gutter side and the hot water pool side at the same time, and the gel-like substance inside is always evenly consolidated, and there is no unevenness in the physical properties of each part. It has a special effect.

Further, when pressed in this way, the gel-like substance inside and the bubbles generated between the mold walls are pressurized and absorbed in the sand mold or gypsum mold, so that high quality molding without bubbles is carried out. It also has the function of obtaining a product.

[0008]

EXAMPLES Hereinafter, the constitution of the present invention will be described in more detail in accordance with examples when the invention is applied to the production of resin dentures.
In the figure, 1 is a flask (frame), 2 is a gypsum mold supported by the flask 1, 3 is a cylinder which is attached to one side of the flask 1 and communicates with a gypsum-shaped grate 2a, and an appropriate amount of The wa-wa resin 4 is housed in the plaster mold 2 through a piston 5 that is hydraulically operated and accommodates the wa-wa resin.

Reference numeral 6 denotes a hot water pool cylinder mounted on the flask 1 at a position facing the gypsum-shaped hot spring grate 2a, which communicates with a hot water pool side runner 2b having a passage cross-section substantially the same as that of the hot water gutter. Further, 7 is a piston piece that is slidable by being fitted into the runner-side runner 2b of the flask 1 and is provided with at least one thin pusher runner 8 penetrating in the axial direction thereof. It will be.

The shape of the piston piece 7 is
The shape is not limited to the cylindrical shape as shown in the drawing, but may be a tapered shape, or any other shape can be used as long as it can be slid in a fixed amount by being fitted into the runway 2b on the pool side of the flask 1.

Reference numeral 9 in the figure denotes a piston which is actuated by hydraulic pressure or the like and re-press-fits the kneading resin that has flowed into the hot water pool cylinder 6 into the gypsum mold 2 via the piston piece 7.

Next, the case of applying the casting principle of the present invention to the production of the resin denture shown in the above embodiment will be described. A powdered resin and a solvent (liquid) are kneaded to obtain a kneaded resin 4 having a high viscosity. It is made, and an appropriate amount thereof is housed in the linder 3 and press-fitted into the gypsum mold 2 through the piston 5 which is operated by hydraulic pressure. The algal resin injected in this manner advances in the direction of the arrow in FIG. 1, but with the progress of the filling of the resin, a part of it flows into the hot water reservoir cylinder 6 from the narrow presser channel 8 and is remolded. It shows a flow of returning to the inside, and air is entrained during this to generate bubbles between the mold wall and the physical properties of each part of the resin floor change (unevenness) due to differences such as the casting distance and casting time of the resin However, according to the present invention, at the end of the filling by the piston 5, the piston 9 of the water pool cylinder 6 is actuated and the inflowing algal resin is re-pressed into the plaster mold 2 via the piston piece 7.

Therefore, since the wrought resin 4 in the gypsum mold 2 is pressed by the two pistons 5 and 9 at the same time at substantially the same pressure from both the hot water gutter side and the hot water pool side, each part in the mold is not affected. The resin is uniformly consolidated without unevenness, and there is no unevenness in the physical properties of each part of the resin floor due to differences in the casting distance and casting time of the resin.

Further, by strongly pressing the internal Rengo resin 4 by both pistons 5 and 9 at the same time, even if bubbles are generated in the mold wall or the like, they are chased between the particles of the gypsum mold to be absorbed. Is possible.

[0015]

As described above in detail, according to the method of filling a highly viscous gel substance according to the present invention, the casting operation is not particularly different from the conventional method, but the molded product has various parts. Since there is no physical property unevenness and no bubbles remain inside, the remarkable effect that the quality and yield of the product can be greatly improved compared to the conventional method can be obtained.

Therefore, it is extremely effective when applied to casting of a material having a high viscosity such as a kneaded resin for a denture base and the viscosity of which increases with time.

[Brief description of drawings]

FIG. 1 is a central longitudinal cross-sectional view showing an example of a flask used for carrying out the method of the present invention.

FIG. 2 is a plan view showing the flask and the gypsum mold shown in FIG. 1 with the upper half part removed.

[Explanation of symbols]

 1 Flask 2 Gypsum type 3 Cylinder 4 Renwa Resin 5 Piston 6 Hot water pool cylinder 7 Piston piece 8 Push-up channel 9 Piston

Claims (1)

[Claims] 1. A cylinder, which accommodates a relatively high-viscosity gel-like substance on one side of a mold supporting a sand mold or a gypsum mold, and which can be extruded under pressure, is provided opposite to this. The size of the runner leading to the riser pool is the same as or substantially the same as the cylinder, and a piston piece formed by penetrating a narrow riser is slidably inserted into the runner, and A method for filling highly viscous gel-like substances, characterized in that the piston piece can be pushed by a hydraulic cylinder, etc.