微米粉體特性測定器為乾燥粉末 ”流動性及噴流性” 指數的測量儀器。
1. 充填鬆裝密度 2. 振實密度 3. 壓縮度
4. 安息角（休止角）5. 刮鏟角 6. 崩潰角 7. 差角
8. 凝聚度 9. 均一度 10. 分散度
PSD 測量 (JIS 相容)
分別使用直徑為d10, d50, d60 和 d90 的篩網，此裝置可以安裝最多12階段的篩筒
依據USP, JP, ASTM 及 Kawakita’s方法自動測量振實密度
The Micron Powder Characteristics Tester called as “Powder Tester” is measuring instrument for the indexes of the “Flowability & Floodability” of dry powder. They were defined by Mr. R.L. Carr (Carr Index) to measure 10 individual powder characteristics, such as angle of repose, cohesion, bulk density and to calculate using with Carr’s index table. Mr. Carr (American mining engineer) has measured more than 1000 powder samples to complete the Carr’s Index Table.
“Powder Tester” has been developed as powder characteristics measuring evaluation. Since the first model of “Powder Tester” PT-A commercialized in 1969, the model changes have been repeated in 40 years. More than 3000 units have been delivered to the customers and have been working all over the world. The customers are using the “Powder Tester” for the purpose of product quality control, design and optimization of production process, or new material development in various business fields, such as secondary battery material, toner or pharmaceutical materials. PT-X has been completed as the 9th model for reflecting the voice of worldwide users. It realizes “global standard of powder characteristics evaluation” by improving accuracy, repeatability, and easier operation.
• Bulk density and related values
Aerated Bulk Density, Taped (Packed) Bulk Density. Compressibility
Angle of Repose, Angle of Spatula, Angle of Fall and Angle of Difference.
Cohesion or Uniformity and Dispersibility
• Equilibrium tapped bulk density
It is measured manually till the packed volume converges within the set value.
• PSD measurement (JIS compatible)
Gives the diameter of d10, d50, d60 and d90 respectively by sieving. The unit can be mounted with maximum 12 stages of sieve drums.
• Automatical measurement of tapped density based on USP, JP, ASTM and Kawakita’s method
The unit (Fig.1) can measure automatically the tapped density with graduated measuring cylinder (USP, United states of Pharmacopoeia). This unit can also supply the others measuring methods of tapped bulk density, such as based on JP (Japanese Pharmacopoeia), ASTM (America Society for Testing and Materials) and Kawakita’s evaluation method. This unit can automatically monitor the powder volume by image analysis and the charging continues till the preset point.
Operator friendly monitor instruction and the improved parts design. Total operation time is shortened to 77% compared to the previous model (For this model, total 20 minutes to complete all the analysis.)
No individual operator’s error by following operating instruction shown on the PC monitor (Fig.2) 5 languages are available, Japanese, English, German, Chinese, or Korean (All overseas languages are available as option). The operating software has new functions such as CSV output of the data, controlling the access level to the data, etc. to satisfy the customer’s requests.
Fully redesigned the moving parts such as vibration and tapping parts give high accuracy. PT-X minimizes a personal error such as measurement of angle or falling motion by shocker. Storage of every measuring condition repeats to set the same condition as the past.
PT-X is designed for air tight structure to prevent a leakage of dust. For the dusty powders, vacuum cleaner can be connected to the PT-X to aspirate the ambient. Optional manual sampling feeder helps to feed the material without opening the enclosure while operating.
Optional small table for measurement of angle of repose and bulk density cup can apply for small volume sample.
Hundreds of science and engineering articles use the measuring data from the series of Powder Characteristics Tester.
The difficulty (bridging level) of discharging the powder from a hopper as a dischargeable minimum diameter, it introduces the following relationship. (14th Proceedings of the symposium on powder science and technology, vol.75, 1976)
The moisture content of the powder greatly affects the flowability index. Varying moisture causes troubles in handling the powder because of the change in flowability index corresponding to the moisture. In order to prevent such trouble, it is necessary to understand the influence of moisture content to the flowability index. (Kagaku kikai gijutsu, vol.22, 155, Soc. of Chemical Engineers, Japan, 1970, Maruzen Publishing Co.)
It is important to consider the coefficient of mixing speed in mixing process. The flowability index of powders affects to the mixing coefficient, PT-X gives the policy to the controlling mixing process by applying the relationship between the flowability index of powder before mixing and the coefficient of mixing speed. (Journal of the Society of Powder Technology, Japan, vol.9, 82, 1972)
A pharmaceutical company conducted a detailed investigation as to whether the flowability and the floodability indices determined by the Powder Characteristics Tester conform to the feeling of persons actually handling the powder. The authors reported that the flowability index obtained by intuitive methods conforms to the results obtained by Powder Characteristics Tester.
Tapping condition is adjustable.
Table 1 shows the range.
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