JPH0260138B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for testing vapor permeability in fibers and building materials.

In recent years, the diversification of fibers and building materials has progressed, and the development of materials that allow water vapor to pass through but do not allow water droplets to penetrate has been in the spotlight. However, no equipment has appeared that can quantitatively measure the vapor permeability of these materials. I can't.

Therefore, at present, it is not possible to completely accurately determine the quality of materials.

Therefore, the present invention aims to accurately and quickly grasp the vapor permeation characteristics of such new materials.

The most important aspect of the present invention is to hold the specimen on a partition wall that partitions the inside of the test chamber, reduce the pressure in both chambers formed by the partitions, and pass steam into one chamber while cooling the other chamber. This allows the steam that passes through the specimen due to the pressure difference to condense and measure the amount.

The device of the present invention will be explained below with reference to the drawings.
₁ and 1 ₂ facing each other, and a through hole 4 is provided between the flanges _{2 1} , 2 ₁ , _{2 2 ,} and 2 2 protruding from both ends of both outer shells 1 1 and 1 ₂ . A steam chamber a and a cooling chamber b are formed by closely joining the packing materials 6 and 7 with the partition plate 3 interposed therebetween while maintaining airtightness with the outside, thereby configuring the test chamber A. The steam chamber a and cooling chamber b are connected to a vacuum pump 15 through a water ejector 16, and a steam generating tank B is connected to the steam chamber a via an electric ball valve 13, while a cooling tank is connected to the cooling chamber b. A cooler 9 connected to the cooling chamber b is connected to cool the inside of the tank b, and a graduated cylinder 10 is connected to the cooling chamber b to measure the moisture condensed inside.

Furthermore, the steam generating tank B is equipped with a heater 12 that adjusts the amount of heat generated by the temperature controller 11 while detecting the temperature inside the tank B, and a refrigerator 17 is installed in the cooling tank C. A cooler 14 connected thereto is housed, and the refrigerator 17 is adjusted by operating a temperature controller 18 based on detection of the water temperature in the cooling tank C.

Incidentally, reference numeral 19 in the figure indicates a vacuum gauge. Further, in the above example, the outer shells 1 ₁ and 1 ₂ are ideally circular, but any shape may be used.

A series of operations of the apparatus of the present invention will be explained below. First, to test a specimen to be subjected to a steam permeation test, for example, a board for building materials, cut it into a predetermined area to make a specimen 8, and then cut it into a test tank A. The outer shells 1 ₁ , 1 ₂ forming the outer shells 1 1 and 1 2 are separated, and the specimen 8 is mounted and held on the upper surface of the permeation hole 4 provided in the center of the partition plate 3 with a sealing material in between. After that, both the outer shell bodies 1 ₁ and 1 ₂ are brought into close contact with each other, and the pump 15 is operated to remove the air in the steam chamber a and the cooling chamber b to reduce the pressure to a degree of vacuum of approximately 40 (mmHg). , then operate the refrigerator 17 to cool the cooler 1 in the cooling tank C.
The water temperature is lowered by the circulation of the refrigerant leading to the cooling chamber b, and the temperature of the cooling water circulating in the cooler 9 of the cooling chamber b is cooled to +5 (° C.) by the pump 15 to maintain the inside of the cooling chamber b at a low temperature. On the other hand, the +40 (°C) steam generated by the heater 12 in the steam generating tank B is led into the steam chamber a. At this time, the steam pressure at +40 (°C) is about 55 (mmHg), so the steam is immediately turned off. Inside room a
It is filled with a vapor pressure of 55 (mmHg), becomes a high pressure state, and enters the specimen 8 if it has even a slight permeability, and permeates into the cooling chamber b, which is in a low pressure state. Moreover, at this time, since the cooler 9 in the cooling chamber b is cooled to a low temperature of +5 (°C), the permeated vapor condenses on the surface of the cooler and drips onto the bottom of the outer shell 1 ₂ and drops into the center. are sequentially stored in the graduated cylinder 10.

By measuring the water collected in this way in units of time and comparing this with the amount of evaporated water in the steam generation tank B, it is possible to quantitatively calculate what percentage has passed through.

Therefore, by using the device of the present invention, it is possible to easily capture the permeability characteristics of not only building material boards but also fiber membranes, which is useful for determining the quality of products on the market, and can also be used as a testing device at the material development stage. can also be used, greatly contributing to better product development.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a main part showing the configuration of the apparatus of the present invention. 3... Parting wall plate, 9... Cooler, 15... Vacuum pump, A... Test tank, B... Steam generation tank.

Claims (1)

[Claims] 1 The inside of the test chamber is divided into a steam chamber and a cooling chamber by a detachable separating wall plate of the specimen, and both chambers are connected to a vacuum pump, and the steam chamber is communicated with a steam generation tank, while the cooling chamber is connected to a vacuum pump. A vapor permeation test device characterized by being cooled by a cooler.