JPH0257861B2 - - Google Patents

Description

[Detailed Description of the Invention] Recently, there has been an increasing demand for facilities that maintain highly clean spaces in various fields, including semiconductor factories and pharmaceutical factories, and the demand for the construction of clean rooms or bio-clean rooms has been increasing.

In order to ensure such a clean space, special considerations not found in ordinary buildings are required, and in terms of equipment, high-performance filters (HEPA filters) are used and air conditioning is achieved with a high ventilation rate. On the other hand, in terms of architecture, three elements are required: airtightness to prevent contaminants from entering, a structure with few irregularities to prevent contaminants from accumulating, and a structure that does not generate contaminants. In particular, selecting materials that generate less dust for walls, floors, and ceilings is an important factor in ensuring a clean space.

However, even though it is actually a material that does not easily generate dust, there is almost no quantitatively confirmed technical data, and the current situation is that it is used without going beyond the realm of speculation.

The present invention was proposed in view of the current situation, and uses a brush made of metal or synthetic resin to apply physical external force to the surface of a specimen placed in a space where a high degree of air cleanliness is ensured. The test method for evaluating dust generation is characterized by forcibly causing the specimen to generate dust by giving a The object of the present invention is to provide a new and useful test method that can quantitatively evaluate the dust generation properties of materials.

In the present invention, as described above, a specimen is placed in a space that is separated from a general living space and has a high degree of air cleanliness, and the surface of the specimen is made of metal or synthetic resin. By applying an external force using a brush, the specimen was forcibly made to generate dust, and the number of fine particles floating in the space was measured. can be evaluated based on

The present invention will be described below with reference to the illustrated embodiments.

Reference numeral 1 denotes a clean chamber separated from the general living space to ensure a locally highly clean space, which includes a HEPA filter 2, a prefilter (not shown), and a Sirotskov fan (not shown).
is installed.

A dust generating device 3 is installed at the bottom of the clean chamber 1.
is arranged, and a motor 4 provided in the dust generating device 3
A specimen 6 is placed on a turntable 5 which is driven and rotated by a metal or synthetic resin brush 8 supported by a support 7 erected on the dust generating device 3. The surface of the specimen 6 is rubbed as the specimen 6 rotates.
9 in the figure is a counterweight with a weight load of 500g each.

Then, there is a hole of a predetermined size, for example, a diameter of 10.5 mm, with a 4-inch hole at the center for fixing to the rotation axis of the turntable 5.
A test piece 6 with a through hole of mm diameter was placed on a turntable 5.
The surface of the specimen 6 is cleaned by operating the Sirocco fan with the door of the clean chamber 1 open.

Next, the door is closed, and after operating the fan to remove all floating particles in the clean chamber 1, the fan is stopped.

After 1 minute, the motor 4 of the dust generating device 3 is activated to drive and rotate the turntable 5 at a rotational speed of 60 rpm, and the surface of the specimen 6 is rubbed with the brush 8, and dust is forcibly generated for 10 minutes.

The clean chamber 1 is activated at the same time as the dust generator 3 is activated.
The air inside the chamber is sucked every minute (0.01 cft/min.) through the sampling tube 10, and suspended particles are measured using a light scattering particle counter or the like.

The amount of dust generated is evaluated based on the total number of suspended particles measured for 10 minutes.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various ways without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing the state of implementation of the dust generation evaluation test method according to the present invention, and FIGS. 2 and 3 are a front view and a side view of a part of the dust generation device, respectively. 1... Clean chamber, 3... Dust generator, 5
...Turntable, 6...Specimen, 8...Brush, 9...Counterweight.

Claims (1)

[Claims] 1. A physical external force is applied to the surface of a specimen placed in a space where a high degree of air cleanliness is ensured using a brush made of metal or synthetic resin to forcibly cause the specimen to generate dust. A dust generation evaluation test method characterized by measuring the number of floating particles generated in the space.