JPS5867328A - Method and apparatus for kneading - Google Patents

Abstract

PURPOSE:To reduce a time necessary for kneading and porosity, by evacuating a vessel filled with gypsum, fillers or the like kneading material, then adding a kneading liquid, and kneading it in vacuum. CONSTITUTION:A vacuum vessel 1 is supplied with a necessary amount of gypsum or filler, and a vacuum pump is driven to evacuate the vessel 1 through an exhaustion pipe 2 to about 50mm.Hg vacuum degree. A prescribed amount of kneading liquid is added to the gypsum or the filler in the vessel 1 by opening the cock 5 of a kneading liquid feeder 4 provided on the upper cover of the vessel 1. Stirring blades 6 are rotated by driving a motor, a coupler 8, and a rotating shaft 7 to knead the gypsum or the filler.

Description

DETAILED DESCRIPTION OF THE INVENTION Unexploded FJI relates to a kneading method and a kneading device, particularly a method and a kneading device for kneading dental gypsum and investment materials.

The present invention covers clay dental gypsum and investment materials (not limited to C, but also includes all kneaded materials such as casting stiffeners, ceramic mold materials, ceramic raw materials, and other organic and rock-free materials). Let's take wood as an example.

First, let's explain the conventional technology. Plaster or investment material is placed in a kneading container such as a rubber ball, a predetermined amount of kneading liquid is added thereto, and the tiles are stirred and kneaded using a spatula such as a spatula. Add the slurry to a reduced-use container and stir under reduced pressure for several minutes to produce a fine-grained mixture without air bubbles.

This conventional technique has a problem in that it takes too much time to perform vacuum stirring and defoaming during the manufacturing process of the kneading proboscis.

Generally, the curing time for dental plaster and investment materials is about 5 minutes, and the time required for pouring into the mold material [7 minutes] is 3 minutes.
However, this method takes at least 5 minutes, so in the end, the mixture is poured into the mold material while the defoaming and mixing process is incomplete, resulting in the occurrence of defective products. It is the cause.

The cause of the shortcomings of the conventional technology (Yes, firstly, plaster or investment material (C
When kneading liquid 2 is added - C1 The gas between these particles is thoroughly mixed with the kneading material.Secondly, by stirring with a spatula, the gas is added to form a sponge-like dough. Thirdly, the viscosity of this kneaded product is quite high, and even with EL, it is difficult to remove air bubbles once introduced, and long-term stirring under reduced pressure is required. 1. In view of the drawbacks of the prior art, the present invention takes a new perspective C and completely overcomes these drawbacks.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to all embodiments shown in the drawings. A top lid (3) whose opening can be freely opened and closed is fully fitted onto the top of the vacuum container (f+). The upper lid (3) is provided with an air outlet (2) that communicates with the T reduction machine (not shown), and the cock (5)
A kneading liquid injector (4) equipped with a container (1
) Connect on the circle. A stirring blade (6) is housed in the container (1), and a joint (8) is provided in which the upper end of the rotating shaft (7) projects from the upper lid (3) and is connected to a motor (not shown).

Next, the operation will be explained. Put the required amount of plaster or investment material into the vacuum container f+, drive the pressure reducer, and open the air outlet (
2) Reduce the pressure in the container (1) to 5QmmHy or less. When the predetermined reduced pressure is reached, open the cock (5) of the kneading liquid injector (4) installed on the top lid (3) and add the predetermined amount of kneading liquid to the plaster or investment material in the container (1). do.

Next, drive the motor to connect the joint (8) and rotating shaft (7) f
f: Rotate the 1rl stirring blade (6) through the container [+] to mix the plaster or investment material inside. The results of concrete implementation are as follows: ■ Mixing of 300 y of plaster and 579 y of water, stirring at a pressure of 5 o for 10 seconds), ■ 300 p of investment material,
By stirring for 15 seconds using 63 tons of water and a pressure of 5 mmHg, a fine-grained kneaded product that was almost completely defoamed was produced. As can be understood from the above, whereas the conventional technology adds a kneaded TO liquid such as water to a kneaded material such as plaster or investment material and then performs kneading under reduced pressure, Compared to the conventional technology, the kneading time is 115~]/10 i1? m shorten.

(b) The porosity of the produced kneaded product is around I15, and the texture is fine.

(/ta) It brings about remarkable effects such as eliminating the occurrence of defective products and eliminating the need for rework.

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[Brief explanation of drawings]

The drawing is a perspective view of a specific embodiment of the present invention. (1) 1-Container (4)・・・Kneading liquid injector Applicant Yamasaki Tane 3 Agent Yoshiteru Takagi 4-

Claims (1)

[Claims] it) Inside the container (・ζ Contains the kneaded material, and after reducing the pressure in this container, add a predetermined amount of kneading liquid under reduced pressure I7,
Stir and knead these contents in the same container under reduced pressure.
(2) A kneading liquid injector capable of supplying an arbitrary amount of kneading liquid into a container communicating with a pressure reducing machine, and a kneading liquid injector that can supply an arbitrary amount of kneading liquid, A kneading device characterized by being equipped with a stirring mechanism for thoroughly stirring and kneading materials.