JPH0548123Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a column for powder permeability meter (hereinafter referred to as column) for physically measuring the wettability of powder.
Regarding.

[Prior Art] Conventionally, to measure the wettability of powder, a filter paper is inserted at the boundary between the powder packed in a column and the liquid, and the filter paper is immersed in the surface of the liquid to prevent the two from mixing.
Some methods use capillarity to measure the rate at which liquid permeates into powder.

The opening end surface of the filter paper holder for holding down the filter paper is measured to have the same opening diameter as the column inner diameter in order to increase the exposed area of the filter paper.

[Problem to be solved by the invention] However, when measuring with a column using the above-mentioned conventional filter paper holder with a large opening end face, the permeation rate may be slower than the theoretical value, or the measured value may often not converge. Phenomena such as these were pointed out.

For this reason, measurements were taken a plurality of times and the average value was calculated and used to approximate the measured value, but this lacked reliability. Although the cause remained unknown, various efforts and experiments were attempted regarding the powder packed in the column, but the measured values continued to remain unimproved.

Therefore, an object of the present invention is to provide a column configured to allow liquid to pass through powder without resistance, thereby converging measurement values and obtaining accurate measurement values.

[Means for Solving the Problems] This invention was made to solve the above problems, and the holes in the filter paper holder are divided into a plurality of small holes, or as one deformed hole, so that the area of the entire hole is reduced. This problem was solved by reducing the size of the filter paper and appropriately limiting the contact area between the filter paper and the liquid.The structure consists of a right cylinder and a removable cylinder with a vent communicating with the hollow part of the right cylinder. It consists of an upper cap, a filter paper holder whose opening end face is provided with a plurality of circular or oval holes to reduce the exposed area of the filter paper, and a lower cap for fixing the filter paper holder.

[Function] By employing the above configuration, the exposed surface of the filter paper is partially closed by the filter paper holder and is reduced, and the exposed portion is evenly distributed, so that when the filter paper comes into contact with the liquid surface, In addition, since the liquid passes slowly through the holes in the filter paper holder, it prevents the filter paper from getting wet rapidly and the air around the filter paper being locally trapped in the powder, eliminating the resistance of the powder. be able to.

[Examples] The details of the present invention will be explained below with reference to drawings showing examples.

Reference numeral 1 denotes a column body, which is a hollow cylindrical body made of a non-wetting material such as a fluororesin, and a flange portion 3 having a male thread 2 protrudes from the upper outer periphery.
An upper cap 4 is attached to the outside of the cap. A hanging tool 6 projects from the center of the upper surface of the upper cap 4, and a ventilation hole 5 is opened. The lower part of the column body includes a flange portion 8 having a male thread 7 on the outer periphery;
A sleeve 9 extends coaxially with the column body 1.

11 is a filter paper, 12 is a filter paper holder, which has a flange 12a and an open end surface 12b;
As shown in FIGS. 4A to 4C, a plurality of circular holes 13 (three in the embodiment), oval holes 14, or cross-shaped holes 15 are provided in the hole. The filter paper 11 is attached by bringing the inside into close contact with the end surface of the sleeve 9, and pressing the outside with the open end surface 12b of the filter paper holder 12 from the outside.

It is desirable that the wall thickness of the opening end surface of the filter paper holder 12 be as thin as possible, and the positions of each hole should be dispersed without concentrating. Also, if the area of the holes is too small, passage resistance will occur, so for example, the inner diameter of the column is 6 mm. In this case, the total area of each hole is selected to be about 1/25 to 1/36 of the opening end surface.

In the column having the above structure, after filling the column body 1 uniformly with powder P at a constant density in advance, the column body 1 is attached to the hook 6 of the upper cap 4 and the probe 17 of the balance 16 is attached. The upper surface of the liquid R in the shear dish 18 and the filter paper 7 are hung together.
are lowered gently so that they touch each other.

When the surface of the liquid R comes into contact with the filter paper 7, the solution passes through the filter paper and then rises inside the powder P at a slow speed due to capillary action depending on the strength of the wetting of the powder P.

At this time, in conventional columns, the contact surface between the filter paper and the liquid is large, so the residual air on the filter paper and the opening end of the filter paper holder is trapped, and the entire filter paper gets wet at once. Air molecules are locally unevenly distributed inside the powder, resulting in a state in which the powder, liquid, and air molecules are partially solidified, and this becomes an obstacle in the powder and prevents the liquid R.
This caused resistance to the rate of increase in the temperature, making it difficult to focus the measured values.

However, according to the column having the above structure according to the present invention, at the initial stage of contact between the filter paper 11 and the liquid R, the liquid R flows through the small holes 13 or 14 or 1 of the filter paper holder 12.
5 and gradually wets the filter paper 11 and rises inside the powder, the air molecules in the filter paper are gradually and evenly dispersed in the powder, so there is no obstruction caused by locally solidified air molecules, and the liquid can pass smoothly through the powder without experiencing any unnecessary resistance.

[Effects of the invention] As described above, the column of the present invention is configured to disperse and reduce the holes in the open end face of the filter paper holder, thereby dispersing and reducing the exposed area of the filter paper and gradually dispersing the air molecules entrapped in the liquid evenly throughout the powder, allowing the liquid to pass through the powder without resistance and the measurement values to be focused, thereby achieving the effect of obtaining accurate measurement values.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a front view with main parts cut away, Fig. 2 is a bottom view, Fig. 3 is an enlarged cross-sectional view of the filter paper holder, and Figs. Figure C is a bottom view showing an embodiment of the bottom hole of the filter paper holder, and Figure 5 is a front view showing the column in use. 1... Column body, 2... Screw, 3... Flange, 4... Upper cap, 5... Ventilation hole, 6...
Hanging tool, 7...screw, 8...flange, 9...
... Sleeve, 10 ... Lower cap, 11 ... Filter paper, 12 ... Filter paper holder, 13 ... Hole, 14 ...
...Long hole, 15...Cross hole, 16... Balance, 17
...Probe, 18...Shearet, P...Powder,
R...Liquid.

Claims (1)

[Scope of utility model registration request] a right cylinder; an upper cap having a ventilation hole that fits into the upper end of the right cylinder and communicates with the hollow part of the right cylinder;
A filter paper holder that is fitted around the outer periphery of the sleeve at the lower end of the right cylinder, a plurality of small holes or one deformed hole formed in the opening end surface of this filter paper holder, and a filter paper holder that is removably fitted to the lower part of the right cylinder. Column for powder permeability meter consisting of a lower cap for fixation.