KR200302945Y1 - A test tube for estimation - Google Patents

Abstract

The present invention relates to a metered test tube, and more particularly, to a metered test tube with a ruler indicating the volume of the liquid discharged to intuitively know the amount of liquid discharged from the test tube. In particular, the position of the scale is changed according to the size of the radius of the test tube and the type of the ruler also varies according to the radius of the test tube.

Description

A TEST TUBE FOR ESTIMATION

Test tubes used in scientific laboratories are containers for liquids, and generally have one end open to a cylindrical appearance so that materials can be inserted. Test tubes containing chemicals may be used for temporary storage, or as carriers for reactions or as containers for heating. Some test tubes are marked with a scale to measure the volume of the solution contained. When transferring a certain amount of liquid from one test tube to another, an intermediate step is usually required to determine the exact amount of solution to be transferred. In this intermediate process, various experimental instruments such as beakers, mass cylinders, test tubes, and droppers are used, and thus, there is a problem in that the stability, accuracy, and ease of experimentation are inferior. Therefore, there is an urgent need for a new test tool that solves the disadvantage of inconvenient and inaccurate time, and allows the user to easily measure and transfer a certain amount of solution.

Accordingly, the present inventors have devised the product for convenient use in general laboratories and educational laboratories by making a test tube for measuring the amount of use according to the slope.

The present invention is intended to reduce the time and error when moving a small amount of liquid from one test tube to another, and to utilize it conveniently. It is an object to enable intuitive measurement of the volume of solution released during use.

1 is a front view showing an aspect in which a ruler is described in a test tube having a diameter of 12 mm.

Figure 2 shows the volume of liquid flowing out when tilting a test tube of Ø12 mm and the corresponding distance from the test tube opening.

The present invention relates to a metered test tube, and more particularly, to a metered test tube with a ruler indicating the volume of the liquid discharged to intuitively know the amount of liquid discharged from the test tube. In particular, the position of the scale is changed according to the size of the radius of the test tube and the type of the ruler also varies according to the radius of the test tube.

The present invention has a structure in which a ruler calculated by experiments and theory is attached to a general cylindrical test tube by various methods. As shown in Fig. 1, the test tube having a diameter of 12 mm is attached to a ruler with a zero opening in the test tube. Figure 2 shows the volume of liquid flowing out when the test tube is tilted at Ø 12 mm and the distance from the test tube opening corresponding thereto. The metering test tube of the present invention has a different ruler according to the diameter of the test tube because the amount of liquid flowing out depends on the diameter of the test tube. Such a ruler can be manufactured by referring to Table 2 below prepared by experiment and theory.

The present inventors theoretically proved the position of the scale through several repeated experiments to find the position of the scale displayed for each volume of the test tube.

The volume of the test tube refers to its volume, which can be expressed in cylinders and hemispheres. If you want to find the volume in a fixed state, the volume of the hemisphere and the cylinder at the bottom are added together. The volume of the hemisphere is excluded. Therefore, the amount of content to be reduced is calculated using the formula (Table 1) extracted in the following figure.

<Figure 1>

TABLE 1

Illustration of the cylinder to find the volume in cm

V = (r ² × π × h) ÷ 2 (r = Øradius), h = V × 2 ÷ r ² ÷ π

Sphere volume (X) = 4 / 3πr ³ , test tube in (Y) = r ² × π × h + 2 / 3πr ³

In other words, V denotes the volume of liquid in the test tube to be supplied, and h denotes the amount of solution discharged from the top of the opening between tests, where h denotes the position of the scale.

Accordingly, the volume of the liquid released by the degree of tilt of the test tube may be changed as follows (Table 2).

Example.

The present invention was produced in the following manner.

1. Scale position measurement

On the basis of the above theory, it was intended to determine the position of the specific scale using the test tube used in the laboratory. In order to achieve this purpose, the experiment was carried out by the following procedure.

(1) Five test tubes of Ø12mm, Ø15mm, Ø18mm, Ø21mm, Ø24, and Ø30mm are used.

(2) Based on the above six test tubes, h, which indicates the amount of solution released, that is, a interval table of scales was prepared.

(3) The produced scale was marked on each test tube in various ways.

(4) The indicated test tubes were verified and supplemented by actual experiments to minimize errors.

The position of the scale in the test tube was obtained by the above method. The results are shown in Table 2 below.

TABLE 2

Supply amount (ml) Ø12 × 120 Ø15 × 150 Ø18 × 180 Ø21 × 200 Ø24 × 190 Ø30 × 200 One 25.46 15.07 9.95 7.05 5.26 2 50.93 30.14 19.89 14.11 10.52 3 76.39 45.20 29.84 21.16 15.78 4 101.86 60.27 39.79 28.22 21.05 5 127.32 75.34 49.74 35.27 26.34 16.24 6 90.41 59.68 42.32 31.57 7 105.48 69.63 49.38 36.83 8 120.54 79.57 56.43 42.09 9 135.61 89.52 63.48 47.38 10 150.68 99.47 70.53 52.61 32.48 11 109.42 77.59 57.87 12 119.37 84.65 63.14 13 129.31 91.70 68.40 14 139.26 98.76 73.66 15 149.21 105.81 78.92 48.72 16 159.15 112.86 84.18 17 169.10 119.62 89.44 18 126.97 99.97 19 134.03 104.17 20 141.08 105.23 64.96

2. Manufacturing of test tubes for weighing

(1) The ruler was produced by printing the position shown in Table 2 on the translucent paper. Each ruler was attached to test tubes of Ø12 mm, Ø15 mm, Ø18 mm, Ø21 mm, Ø24 mm and Ø30 mm, respectively. The test tube was tilted to release the liquid. Several iterations resulted in accurate measurements that were difficult and timely, and thus did not last long.

(2) A ruler was produced by printing the positions shown in Table 2 on each of the stage papers. Each ruler was attached to test tubes of Ø12 mm, Ø15 mm, Ø18 mm, Ø21 mm, Ø24 mm and Ø30 mm, respectively. The test tube was tilted to release the liquid. Repeated several times showed better than the paper scale of (1) but not smooth and melted when heated.

(3) After the silk paper was printed using the ruler of printed paper, the ruler was made by rubbing through each roller. The test tube was tilted to release the liquid. As a result, it was greatly improved than the previous (1) and (2), but the quality was excellent.

(4) Heat treatment after marking the ruler by silk printing not to discolor even at high temperature. The test tube was tilted to release and meter the liquid. The result was perfect in all respects, but the cost of the product was rather high.

The present invention can measure the amount of solution in vitro relatively accurately and simply to reduce the error in the experiment process, and to remove the mass cylinder or other apparatus in the process of removing or transferring the desired amount of solution in vitro. It also reduces the hassle of using.

Claims (4)

Metering test tube with a ruler starting from the opening of the test tube to intuitively know the amount of liquid released from the test tube. The test tube for measuring according to claim 1, wherein the ruler is made of translucent paper. The test tube for measuring according to claim 1, wherein the ruler is manufactured by silk printing. The test tube for measuring according to claim 1, wherein the ruler is manufactured by heat treatment after silk printing.