Powder dustiness evaluation method and powder dustiness evaluation device

Patent metadata

Field	Value
Publication number	US-10684222-B2
Application number	US-201716082620-A
Country	US
Kind code	B2
Filing date	Apr 14, 2017
Priority date	May 2, 2016
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

The present invention intends to provide a method by which the scattering property of a powder can be more clearly evaluated. There is provided a method for evaluating a scattering property of a powder, the method including dropping a powder to be evaluated onto a liquid placed in a box, thereby scattering the powder as dust in the box, and measuring a dust concentration in air in the box with a dust meter. There is also provided an apparatus for evaluating a scattering property of a powder, the apparatus including a box in which a liquid is to be placed, and a dust meter that measures a dust concentration in air in the box when the powder to be evaluated drops onto the liquid placed in the box and scatters as dust.

First claim

The invention claimed is:

1. A method for evaluating a scattering property of a powder, the method comprising:
dropping the powder to be evaluated onto liquid placed in a box, thereby scattering the powder as dust in the box; and
measuring a concentration of the dust in air in the box with a dust meter wherein the box comprises:
a hole portion, as an inlet through the powder is introduced into the box; and a supply path,

the hole portion is positioned at a level higher than a surface of the liquid in the box,
the powder is dropped onto the liquid using the supply path that introduces the powder from the hole portion to the liquid,
the supply path comprises:
an introduction portion as an inlet of the supply path, from which the powder is introduced to the supply path;
a supply portion as an outlet of the supply path, from which the powder slides down toward the liquid; and
an inclination portion at a side of the supply portion in the supply path, and the supply path is inclined at the inclination portion, relative to the surface of the liquid.

2. The method for evaluating a scattering property of a powder according to claim 1 ,
wherein the box further comprises:
a box main body whose upper portion is open; and
a lid that covers the upper portion of the box main body, and the lid comprises the hole portion.

3. The method for evaluating a scattering property of a powder according to claim 1 ,
wherein the supply portion in the supply path is provided at a height apart from the surface of the liquid in a range from 1 mm to 30 mm.

4. The method for evaluating a scattering property of a powder according to claim 1 ,
wherein the liquid is introduced into a container whose upper portion is open,
the container including the liquid therein is accommodated in the box, and
the liquid is thereby placed in the box.

5. The method for evaluating a scattering property of a powder according to claim 1 , wherein the powder is a dental powder product.

6. The method for evaluating a scattering property of a powder according to claim 1 ,
wherein the supply portion in the supply path is provided at a height apart from the surface of the liquid in a range from 5 mm to 15 mm.

7. The method for evaluating a scattering property of a powder according to claim 1 ,
wherein an angle between the inclination portion of the supply path and the surface of the liquid is in a range from 20° to 70° .

8. The method for evaluating a scattering property of a powder according to claim 1 ,
wherein the hole portion of the box and the introduction portion of the supply path are same.

9. An apparatus for evaluating a scattering property of a powder, the apparatus comprising:
a box in which liquid is to be placed; and
a dust meter that measures a concentration of the powder as dust in air in the box when the powder to be evaluated drops onto the liquid placed in the box and scatters as dust in the box,
wherein the box comprises:
a hole portion that is configured to be an inlet through which the powder is introduced into the box; and
a supply path that is configured to introduce the powder from the hole portion to the liquid,

the hole portion is configured to be placed at a level higher than a level of a surface of the liquid to be placed in the box,
the supply path comprises:
an introduction portion as an inlet of the supply path, from which the powder is introduced to the supply path;
a supply portion as an outlet of the supply path, from which the powder slides down toward the liquid; and
an inclination portion at a side of the supply portion in the supply path, and the supply path is inclined at the inclination portion, relative to the surface of the liquid.

10. The apparatus for evaluating a scattering property of a powder according to claim 9 ,
wherein the box further comprises:
a box main body whose upper portion is open; and
a lid that covers the upper portion of the box main body, and

the lid comprises the hole portion.

11. The apparatus for evaluating a scattering property of a powder according to claim 9 ,
wherein the supply portion in the supply path is provided at a height apart from the surface of the liquid in a range from 1mm to 30 mm.

12. The apparatus for evaluating a scattering property of a powder according to claim 9 , further comprising a container in the box,
wherein the container is configured to accommodate the liquid therein, and
the liquid is to be introduced into the container from an upper portion thereof, the upper portion of the container being open.

13. The apparatus for evaluating a scattering property of a powder according to claim 9 , wherein the powder is a dental powder product.

14. The apparatus for evaluating a scattering property of a powder according to claim 9 ,
wherein the supply portion in the supply path is provided at a height apart from the surface of the liquid in a range from 5 mm to 15 mm.

15. The apparatus for evaluating a scattering property of a powder according to claim 9 ,
wherein an angle between the inclination portion of the supply path and the surface of the liquid is in a range from 20° to 70° .

16. The apparatus for evaluating a scattering property of a powder according to claim 9 ,
wherein the hole portion of the box and the introduction portion of the supply path are same.

Assignees

• Yoshino Gypsum Co

Inventors

• Horiuchi Tatsuya
• Sugano Kenichi

Classifications

• G01N2021/4769

  Fluid samples, e.g. slurries, granulates; Compressible powdery of fibrous samples · CPC title

• G01N15/06

  Investigating concentration of particle suspensions (by weighing G01N5/00; investigating sedimentation of particle suspensions G01N15/04; investigating individual particles G01N15/10) · CPC title

• G01N2015/0046

  in gas, e.g. smoke · CPC title

• G01N2015/0096

  Investigating consistence of powders, dustability, dustiness · CPC title

• G01N21/51 Primary

  inside a container, e.g. in an ampoule (G01N21/53 takes precedence) · CPC title