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Device for characterizing the particle size distribution of powders and its uses

A characterization and powder technology, applied in the direction of measuring devices, particle size analysis, chemical instruments and methods, etc., can solve the problems of changing the pitch of the helix, destroying the spring, and no longer ensuring the integrity of the device, etc.

Inactive Publication Date: 2013-04-17
OMYA SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the particle size characteristics of various powders can already be determined online, the device poses new problems for the technician
In fact, as the figure on the title page of said document indicates, when the particles of the powder to be analyzed fall into the receiving chamber located above the spring, these particles have a double disadvantage: their energy may be sufficient to cause them to be destroyed when they collide with the spring. Destruction (the integrity of the material being tested is no longer guaranteed), and / or breaking the spring, damaging the helix, or altering the pitch of the helix (thus no longer ensuring the integrity of the device and thus the measurement)
[0055] The second minor technical issue is related to the required simplicity of use and concerns the cleaning of the unit

Method used

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  • Device for characterizing the particle size distribution of powders and its uses
  • Device for characterizing the particle size distribution of powders and its uses
  • Device for characterizing the particle size distribution of powders and its uses

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0102] This example shows the use of the present invention to determine OMYA TM The company produces in the Salses (France) factory and uses Durcal TM The particle size characteristics of the calcium carbonate powder sold under the name 130.

[0103] To this end, four filter screens are installed in the device of the present invention, with meshes equal to 100 μm, 250 μm, 355 μm, and 500 μm to meet the needs of analyzing the above-mentioned powder products (customer's quality indicators, etc.). The time for the powder to pass through each sieve is equal to 06:00 minutes, 07:30 minutes, 04:00 minutes, 00:30 minutes, and finally 00:25 minutes at the release position of the largest-scale particles.

[0104] The corresponding results, expressed as the percentage of particles (not acceptable) with a diameter larger than each screen mesh, are shown in Table 1.

[0105] Not accept 100μm (%)

Not accept 250μm (%)

Not accept 355μm (%)

Not accept 500μm (%)

82.09

30.55

0.55

0

78.76

29....

example 2

[0109] The purpose of this example is to show the reliability of the device of the invention for the correlation between the measurement of the same sample by the device of the invention and the laboratory manual measurement.

[0110] This example uses OMYA TM The company produces in the Salses (France) factory and uses Durcal TM Calcium carbonate powder sold under the name of 130.

[0111] Different samples of the powder have been analyzed under the same conditions as described in Example 1 with the device according to the invention.

[0112] At the same time, these samples were manually sieved through a 100μm filter and another 250μm filter.

[0113] At the end of this article image 3 , 4 Represents the relationship between the non-acceptance (vertical axis or y-axis) based on laboratory manual measurement and the non-acceptance of measurement according to the present invention (abscissa axis or x-axis):

[0114] -At 100μm( image 3 Represents a linear regression line, its equation i...

example 3

[0118] This example shows the use of the present invention for Cristal Union TM The crystalline white sugar powder produced by the company in the Corbeilles (France) plant and sold in the form of powdered sugar is characterized by particle size.

[0119] To this end, 5 filter screens are installed in the device of the present invention, with meshes equal to 125 μm, 250 μm, 500 μm, 630 μm, and 800 μm, which meet the needs of analyzing the above-mentioned powders (customer's quality indicators, etc.). The time for the powder to pass through each sieve is equal to 06:30 minutes, 06:00 minutes, 06:00 minutes, 05:00 minutes, and 03:30 minutes, and finally the release position of the largest-scale particles is 02:30 minutes.

[0120] The corresponding results, expressed as the percentage of particles (not acceptable) with a diameter larger than each screen mesh, are shown in Table 2.

[0121] Not accept 125μm (%)

Not accept 250μm (%)

Not accept 500μm (%)

Not accept 630μm (%)

800μm ...

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Abstract

The invention is a device for characterizing the particle size distribution of powders, comprising a supply member, a discharge member, a weighing member, a continuous vibration member, a screening member and, optionally, a control member, said device being characterized in that the screening member is a member that rotates about a horizontal axis and has at least four positions corresponding to two screens of different mesh size, one release space and one anti-shock plate. Another subject of the invention is the use of such a device for characterization of the particle size distribution of powders and especially their in-line characterization, that is to say characterization during their manufacturing process.

Description

Technical field [0001] The present invention relates to the field of devices and equipment for determining the particle size of powder products, and this characteristic can be realized on-line, that is, during the manufacturing process of the powder products. [0002] In particular, the powder product involved is a dry powder product, that is, the powder product has a moisture content of less than 5% by weight. The humidity is determined by differential weighing measurement, for example, before and after the powder product is dried. [0003] The powders involved are also powders with a large particle size range, that is, the average particle diameter is between 0.05 mm and 10 mm. [0004] More particularly, the powders involved are powders used in the food field, such as powders based on sugar crystals, salt powders, flour, milk powder, powders composed of dehydrated food materials, detergent powder, Ceramic powder, plastic powder, metal powder, paint powder, pharmaceutical powder, p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02B07B1/26
CPCB07B1/22G01N2015/0096G01N15/02B07B1/26
Inventor G·拉尔若德
Owner OMYA SAS
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