JPH0138055B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating vacuum forming method that allows glass or quartz to be heated and formed into a bottomed tubular or cylindrical object.

For example, when analyzing and measuring the components and properties of various samples such as blood or reagents by shining light on them,
Normally, these samples and reagents are placed in a bottomed tube made of glass or quartz, generally called a cell, for analysis and measurement. The manufacturing process was extremely troublesome because it was formed into an extremely small rectangular tube shape with a bottom of 4 mm.

1 and 2 are a perspective view and a front sectional view illustrating an example of the conventional manufacturing of the above-mentioned cell. The main body 1a is manufactured by laminating side plates 2, 2 made of glass on both sides so as to close the openings 1b on both sides of the main body 1a. The glass cell 1 manufactured in this way has edges at each corner, making cleaning and washing the inside very difficult. Or, reagent E is attached as a residue ED,
There is a problem that mixing of residual ED may cause errors or adverse effects on analysis, etc., and sample or reagent E may seep out from the edge part due to capillary action to the rim 1c of the cell. In many cases, the side plates 2, 2 bonded together may peel off due to heat or chemicals during use, and there is a problem of lack of heat resistance and chemical resistance, and manufacturing is very troublesome and manufacturing costs are high. There were various problems such as the high cost.

Therefore, the vacuum processing method illustrated in FIGS. 3 and 4 was devised. According to this processing method, a core metal 4 that determines the shape of the cell is inserted into a bottomed tube 3 made of glass or quartz that has been made thick in advance.
In addition, the suction port 5 of a vacuum pump (not shown) is connected to the upper end of the bottomed tube 3, and the bottomed tube 3 is inserted into the electric furnace 6 while the inside of the bottomed tube 3 is always kept in a vacuum. By inserting it between the left and right heaters 7, 7, the entire bottomed tube 3 is heated and molded to match the core metal 4, and after molding, the core metal 4 is taken out and cut 8 to an appropriate length. Thus, the cell 9 can be manufactured.

The cell 9 manufactured by this processing method has no edges inside, and has the problems that the above-mentioned laminated cell 1 had, such as sample E etc. seeping out due to capillary action and sample E remaining. However, on the other hand, the electric furnace 6
When performing heat molding, the bottom surface of the bottom tube 3 is Heat is not applied to the portion 3a sufficiently, and therefore, the bottom portion 3a cannot be properly molded to match the bottom surface 4a of the core metal 4, and the bottom portion 9a of the cell 9 is distorted or has waves. In many cases, this cell is molded, and when light is applied to it, it refracts irregularly, making it impossible to properly analyze and measure sample E, etc. Therefore, this cell 9 is used to analyze and measure When measuring, please use the bottom part 9 mentioned above.
It is necessary to fill the cell 9 with a large amount of sample or reagent E as shown in FIG.

Furthermore, the heating manufacturing method of the cell 9 using the electric furnace 6 in which the heaters 7, 7 are arranged facing each other as described above is as follows.
There was a problem that the number of cells 9 that could be heated and molded at one time was small, resulting in high manufacturing costs.

The present invention was developed in view of the above-mentioned points, and its purpose is to enable correct heat molding of the bottom part to match the bottom face of the core metal, and to form a large number of bottomed tubular or An object of the present invention is to provide a method for heating and vacuum forming glass and quartz that can heat-form cylindrical products at low cost. By inserting a cored metal and gradually inserting this bottomed tube into an electric furnace equipped with a heating heater at the inner bottom while constantly exerting the suction effect of a vacuum pump inside the bottomed tube, the material is heated. The bottom tube is configured to be heated and molded sequentially from the bottom side to match the core metal.

A preferred embodiment of the present invention will be described in detail below based on the descriptions in FIGS. 5 to 8.

In the figure, numeral 10 is a bottomed tube made of glass or quartz made thick in advance, and numeral 11 is a bottomed tube made of glass or quartz that is made thick in advance.
With the core metal 11 inserted into the inside of the core 11, the bottomed tube 10 is molded according to the shape of the core metal 11 as described below. FIG. 7 is a perspective view showing an example of the cored metal 11, and each corner 11a of the cored metal 11 is formed in advance so that an edge does not stand at each corner inside the bottomed tube 10 during molding. It is chamfered. Further, 12 is a suction connection port of a vacuum pump (not shown) connected to the open root end 10a of the bottomed tube 10 containing the cored metal 11 as described above, and the bottomed tube 10 is connected to this suction connection port. While the inside is always maintained in a vacuum state under the suction action from 12, and while being suspended from the connection port 12, it is gradually lowered and inserted into the inside of the electric furnace 13 through the upper surface insertion port 13a while rotating. Then, the heater 14 disposed at the inner bottom of the electric furnace 13 gradually heats and molds from the bottom surface portion 10b side.

To explain the aspect of the above-mentioned heat forming in more detail, as shown in FIG. The bottom surface portion 10b is first heated by the heater 14, and then the peripheral surface portion 10c side is heated gradually and evenly. During this heating, the inside of the bottomed tube 10 is always maintained in a vacuum state by forced suction from the suction connection port 12, so that the gap between the inner surface of the bottomed tube 10 and the core metal 11 is The remaining gas is sequentially extracted, thus
The bottomed tube 10 is molded to match the outer shape of the core metal 11 by the above-mentioned heating and vacuum action.
The bottom surface portion 10b is directly heated to a high temperature by
can be precisely and neatly heat-molded along the bottom portion 11b of the core metal 11.

After the heat forming described above is completed, the formed bottomed tube 10 is taken out from the electric furnace 13, and after cooling, the core bar 11 is pulled out and cut into an appropriate length 1 as shown in FIG.
5, it is possible to make a cell 16 with a bottom, for example.

Since the cell 16 manufactured by the above method has a neatly molded inner surface, it is easy to clean and wash, and it has excellent heat resistance and chemical resistance. Since it is precisely molded to match the shape, when the sample E etc. stored inside is analyzed by shining light on it, this bottom surface part 16a does not refract or diffuse the light, making it easy to perform various analyses. In addition to being able to perform measurements accurately, the amount of sample or sample E to be accommodated can also be made much smaller than the amount X of the conventional example shown in FIG. 4, as indicated by Y shown in FIG. can.

Incidentally, FIG. 6 shows an example of the electric furnace 13 used when carrying out the present invention, and in the present invention, the heater 1
4 is disposed at the inner bottom of the electric furnace 13, and the bottomed tube 10 inserted and lowered is heated and molded from the bottom surface 10b side. By opening, a large number of bottomed tubes 10 can be heated and molded at one time using one electric furnace 13, and only one large heater 14 can be disposed at the inner bottom of the electric furnace 13. Since the electric furnace 13 can be easily constructed, it has the advantage that it can be mass-produced at once at a low cost.

As described above, the heating and vacuum forming method of glass and quartz according to the present invention can form glass or quartz into a bottomed tubular object or a bottomed cylindrical object of a predetermined shape. In particular, the invention allows for accurate and clean molding of each bottom surface of the manufactured product to match the bottom surface of the inserted core metal, and also enables mass production with simple equipment, reducing manufacturing costs. It is also economical in that it can significantly reduce the cost, and is suitable for use in, for example, manufacturing cells and the like.

[Brief explanation of drawings]

Figure 1 is a perspective view illustrating a conventional manufacturing example, Figure 2 is a front sectional view of a cell manufactured by the manufacturing example shown in Figure 1, and Figure 3 is a diagram of another conventional molding device. FIG. 4 is a front sectional view of a cell manufactured by the molding apparatus shown in FIG. 3, and FIG. 5 is a front sectional view showing an example of the molding apparatus for implementing the present invention. FIG. 6 is a perspective view showing an example of an electric furnace used in the present invention, FIG. 7 is a perspective view of a core bar also used in the present invention, and FIG. 8 is a perspective view of a cell molded according to the present invention. FIG. 10...Bottomed tube, 10b...Bottom part, 11...
Core metal, 11b... Bottom, 12... Vacuum pump suction connection port, 13... Electric furnace, 14... Heater.

Claims (1)

[Claims] 1. A cored metal is inserted inside a bottomed tube made of glass or quartz, and while a vacuum pump is constantly applying suction to the inside of the bottomed tube, an electric heater is gradually installed at the inner bottom. A method for heating and vacuum forming glass or quartz, characterized in that the bottomed tube is heated and formed gradually from the bottom side in alignment with the core metal by lowering the tube into a furnace.