JPS6112535B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring the viscosity of a liquid and a viscometer for the same.

By the way, in the field of printing technology, the management of ink viscosity plays a very important role in optimizing printing quality. The viscosity of ink has a close relationship with the concentration when transferred to the printing substrate.
This is because the quality of ink viscosity immediately affects the suitability of printing.

Ink viscosity control is particularly important in gravure printing. This is because gravure ink contains pigments,
Contains volatile solvents in addition to binders.
This is because during printing, this solvent evaporates and the viscosity naturally increases. Ink with increased viscosity inevitably becomes more concentrated, which causes a change in print quality before and after printing, and above all, causes a worsening of transferability to paper, etc. .

Therefore, in gravure printing, the viscosity of the ink is periodically measured during printing, and if the viscosity increases, additional solvent is added. Viscosity measurements are made before and after this solvent injection operation.

In addition, viscosity measurement is also performed during the meat preparation operation performed before printing starts. That is, ink purchased from an ink manufacturer is called base ink and cannot be used immediately for printing, so one base ink may be mixed with another base ink, or a solvent may be added to the base ink. Alternatively, work is required to ensure appropriate hue density and viscosity by mixing a mixer (white ink, etc.). Viscosity measurement is performed before and after this operation, and the amount of solvent and mixer mixed is adjusted depending on the measurement results.

Note that if too much solvent is used and the viscosity decreases too much, the ink density will of course decrease, but when printing on paper or the like, unevenness will occur and the printing quality will be adversely affected. Therefore, the viscosity of the ink should not be too high or too low.

As described above, measuring the viscosity of ink is an important task and is performed extremely frequently.
Therefore, it is important to be able to easily measure viscosity in order to improve printing efficiency.

Conventionally, the following methods have been used to measure the viscosity of gravure ink.

That is, industrial viscometers such as Foordkup and Zahnkup are used because they are easy to handle and provide values in a short time. In these methods, ink is poured into a cup to a certain height, the time required for a certain amount of liquid to flow out is measured, and the viscosity is determined over this time.

However, since this method measures time, it necessarily requires equipment such as a stopwatch.

The present invention provides two or more small holes of different sizes on the same horizontal line at the bottom of the side wall of the tank, allows the liquid in the tank to flow out from the small holes, and supplies the liquid into the tank. A method for measuring viscosity, characterized in that the viscosity of a liquid is expressed by the minimum size that can be discharged parabolically from the small hole while keeping the height constant, is defined as a specified invention, and is directly used for carrying out the method invention. As a device, a tank having two or more small holes of different sizes in the lower part of the side wall, an auxiliary tank for replenishing liquid in the tank, and a connecting body for connecting the tank and the auxiliary tank;
The present invention proposes a viscometer consisting of the tank and a hanging body for the auxiliary tank.

According to the present invention, liquid is discharged from two or more small holes of different sizes, but if the hole diameter is small, the liquid will not draw a parabola and will simply flow down along the wall. When it reaches a certain size, it begins to draw a parabola and is ejected. The minimum pore size for this parabola depends on the viscosity of the liquid. Therefore, the viscosity of the liquid can be determined by the minimum pore diameter that forms a parabola. Specifically, small holes of different sizes are arranged in advance on the same horizontal line in several stages, so that it can be determined from which hole to discharge on a parabola, and a scale indicating the viscosity is displayed above each small hole. It is something that should be done. In this way, the viscosity can be easily measured by reading the display on the small hole, making it unnecessary to use a stopwatch or the like.

Embodiments of the present invention will be described below based on the drawings.

In FIGS. 1 and 2, 10 is a tank. At the bottom of the side wall of the tank, there are two or more small holes 1 of different sizes.
2 are placed on the same horizontal line. As can be easily understood from the drawings, liquid flows out from the small holes 12a and 12b, but does not form a parabola. The liquid is discharged in a parabolic shape starting from the small hole 12c. Of course, the small hole 12d,
12e is also discharged in a parabolic manner,
In the present invention, the structure is such that the viscosity of the liquid can be determined from the minimum diameter of the parabolic hole, that is, the small hole 12c. Although not shown in the drawings, it is of course possible to easily measure the viscosity by marking a scale on each small hole.

An auxiliary tank 14 is provided above the tank. A small hole 15 is also provided at the bottom of the auxiliary tank, through which liquid flows toward the opening of the tank 10.

Both tanks 10 and 14 are connected by a connecting body 16. The connecting body 16 further extends upward and constitutes a hanging body 18 for both tanks. The positional relationship between the two tanks is such that their center lines coincide with each other. This is because when both tanks are suspended by the hanging body 18, it is easy to balance them, and the parabola of the liquid discharged from the small hole 12 can be prevented from changing.

However, within the range where the above parabola is not affected, tank 1
0 and the auxiliary tank 14 are shifted from each other to create a tank 1.
It is also possible to make it convenient for cleaning inside 0. In this case, measures are taken such as providing a hole 15 for the auxiliary tank in the side wall, or providing a pipe that fits from the hole 15 to the tank 10.

Furthermore, in order to solve both the problem of balance between the two tanks and the problem of cleaning, the connecting body 16 is constructed so that the two tanks are shifted from each other only when necessary. This can be achieved by, for example, making the connecting body 16 a screw connection.

Alternatively, as shown in FIG.
It may be made rotatable with respect to. In addition, in order to facilitate cleaning, the lower parts of both tanks 10 and 14 are equipped with a third tank.
It is best to have a curved surface as shown in the figure.

Specifically, both tanks connected by the connecting body 16 and having the hanging body 18 attached thereto as described above are immersed together in an ink tank, and after both tanks are filled with ink, they are pulled up. Then, although liquid flows out from the tank 10 through the small hole 12, liquid is replenished from the auxiliary tank 14 through the small hole 15, so that the liquid level in the tank is maintained constant. Therefore, as long as there is liquid in the auxiliary tank 14, the parabola drawn by the discharged liquid will maintain a constant shape.

In order to keep the liquid level constant in the tank, it is sufficient to equalize the discharge amount from the hole 15.

However, it is easiest to make the discharge amount from the hole 15 larger than that from the hole 12 so that the difference amount overflows from the tank 10, and moreover, it is possible to accurately keep the liquid level constant. When adopting an overflow type, it is preferable to provide a notch 20 in the tank 10. The notch 20 is preferably provided at a position away from directly above the hole 12, especially facing the connecting body 16, so that the overflowing liquid can fall down through the connecting body 16 (the first
figure). However, it is not necessary to have them present (Figure 3).

Which of the holes 12, counting from the smallest diameter or the largest diameter, from which the discharged liquid flies in a parabolic manner depends on the viscosity of the liquid. The discharge small hole 12
The larger the diameter, the higher the viscosity. The viscosity value displayed by a small hole can be converted into one or more of length (distance), time, CPS, etc. by comparing it with the viscosity measured by other viscometers through experiments in advance.

In the present invention, viscosity measurement can be used not only for ink but also for paints, lubricating oils, and the like.

In any case, the present invention is characterized in that the viscosity can be measured visually without a stopwatch, and at the same time it is simple in construction.

[Brief explanation of the drawing]

Figure 1 is a perspective view of an example of a viscometer, and Figure 2 is a perspective view of an example of a viscometer.
A sectional view taken along the line A-A in the figure, and FIG. 3 is a perspective view of another embodiment of the viscometer. 10...tank, 12...small hole, 14...auxiliary tank.

Claims (1)

[Claims] 1. Two or more small holes of different sizes are provided on the same horizontal line at the bottom of the side wall of the tank, and the liquid in the tank flows out from the small holes, and the liquid is supplied into the tank. A method for measuring viscosity, characterized in that the viscosity of the liquid is expressed by the size of the smallest hole that can be discharged parabolically from the small hole while maintaining the liquid level in the tank constant. 2. An auxiliary tank is provided above the tank, both of these tanks are filled with liquid at the same time, and the liquid is supplied from the auxiliary tank into the tank to keep the liquid level constant in the tank. The viscosity measuring method according to claim 1, wherein a constant discharge state is maintained. 3. The viscosity according to claim 1, wherein the liquid is kept in a constant discharge state by constantly supplying a fixed amount of liquid into the tank and keeping the liquid level constant in the tank. Measurement method. 4 Viscometer consisting of the following items a: A tank having two or more small holes of different sizes at the bottom of the side wall. b. Auxiliary tank for replenishing liquid in the tank. c. A connecting body that connects the tank and the auxiliary tank. d Hanging bodies for the above tank and auxiliary tank. 5. The viscometer according to claim 4, wherein the center lines of the tank and the auxiliary tank are aligned. 6. The viscometer according to claim 4, wherein the central axes of the tank and the auxiliary tank are shifted from each other. 7. Claim 4 or 5, wherein the connecting body is configured to shift the tank and the auxiliary tank.
Viscometer as described in section. 8. The viscometer according to claim 4, wherein the connecting body and the hanging body are integrally constructed. 9. The viscometer according to claim 4, wherein a notch is formed in the opening of the tank.