• Title/Summary/Keyword: jet mill

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Effects of Different Milling Methodes on Physico-chemical Properties & Products (제분방법이 쌀가루 및 제품의 특성에 미치는 영향)

  • Kum, Jun-Seok;Lee, Sang-Hyo;Lee, Hyun-Yu;Kim, Kil-Hwan;Kim, Young-In
    • Korean Journal of Food Science and Technology
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    • v.25 no.5
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    • pp.546-551
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    • 1993
  • Rice flour obtained by four different milling methods, Pin mill. Colloid mill, Micro mill, and Jet mill, were used to investigate physico-chemical properties and product. Crude fat, ash, and protein contents of rice flours between different milling methods were similar. Blue value, amylose content, and damaged starch which related to properties of rice flour were reduced in the order that of Jet mill, Micro mill, Colloid mill, and Pin mill. Water absorption index, water solubility index, and water retention capacity increased as damaged starch increased. Hardness of gel(15%) is the highest value for Pin mill. The finer granules (Jet mill) had lower gelatinization onset(To) and peak(Tp) than any other rice flours. Those result are simillar with amylogram properties. Enthalpy of gelatinization increased as damaged starch increased. Jet mill had the highest score (p<0.05) of overall test in sensory evaluation and good paste properties.

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Hepatoprotective Effects of Amorphous and Nnno-Particle Pyeparations of Ursodeoxycholic Acid in CC4-Induced Mice : Effects of Three Types of Fine Grinding Mills (Ursodeoxycholic acid의 무정형 초미립자제제들의 CC4 유도 간손상 생쥐에 대한 보호 효과)

  • 정한영;곽신성;김현일;최우식;이지현;김애라;박태현;정해영;김유정
    • Biomolecules & Therapeutics
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    • v.10 no.1
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    • pp.1-6
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    • 2002
  • The particle size of medicinal materials is an Important physical property that affects the phar-maceutical behaviors such as dissolution, chemical stability, and bioavailability of solid dosage forms. The size reduction of raw medicinal powder is needed to formulate insoluble drugs or slightly soluble medicines and to improve the pharmaceutical properties such as the solubility, the pharmaceutical mixing, and the dispersion. The objective of the present study is to evaluate physiological activity of amorphous and nano-particle prep-arations of insoluble drug, ursodeoxycholic acid (UDCA), which were made by three types of fine grinding mills. The change of physical properties of ground UDCA was conformed by Mastersiger microplus and X-ray diffraction. We have investigated hepatoprotective effects of the nano-particle preparations of UDCA by plan-etary mill, vibration rod mill and jet mill in $CCI_4$-induced oxidatively injured mouse liver. The results showed that nano-particle preparations of UDCA all decreased reactive oxygen sepecies generation and lipid peroxi-dation in $CCI_4$-induced oxidative stress mice. Among them, nano-particle preparations by vibration rod mill and jet mill showed more significantly hepatoprotective effects compared to intact UDCA and planetary mill-ground UDCA. These results suggest that ground UDCA with vibration rod mill and jet mill shows a high amorphous state and the improved dissolution.

A Study on the Improvement of Skin-affinity and Spreadability in the Pressed Powder using Air Jet Mill Process and Mono-dispersed PMMA (Air Jet Mill 공법과 PMMA의 단분산성이 프레스드 파우더의 밀착성 및 발림성 향상에 대한 연구)

  • Song, Sang Hoon;Hong, Kyong Woo;Han, Jong Seob;Kim, Kyong Seob;Park, Sun Gyoo
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.43 no.1
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    • pp.61-68
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    • 2017
  • The key quality attributes of the pressed powder, one of base makeup products, are skin-affinity and spreadability. In general, there was a limit to meet skin-affinity and spreadability simultaneously, which are opposite attributes each other. In this study, air jet mill process was tried to satisfy two main properties. Skin-affinity was improved by a wet coating of sericite with a mixture of lauroyl lysine (LL) and sodium cocoyl glutamate (SCG). The application of mono-dispersed polymethyl methacrylate (PMMA) and diphenyl dimethicone/vinyl diphenyl dimethicone/silsesquioxane crosspolymer (DDVDDSC) improved both qualities. Air jet mill process has been mainly applied in the pharmaceutical and food industries, and is a method used for processing powder materials in cosmetic field. In this study, we were able to complete makeup cosmetics with an optimum particle size $6.8{\mu}m$ by combining the air jet mill process at the manufacturing stage. It was confirmed that the Ti element was uniformly distributed throughout the cosmetics by EDS mapping, and that the corners of the tabular grains were rounded by SEM analysis. It is considered that this can provide an effect of improving the spreadability when the cosmetic is applied to the skin by using a makeup tool. LL with excellent skin compatibility and SCG derived from coconut with little skin irritation were wet coated to further enhance the adhesion of sericite. SEM images were analyzed to evaluate effect of the dispersion and uniformity of PMMA on spreadability. With the spherical shapes of similar size, it was found that the spreading effect was further increased when the distribution was homogeneously mono-dispersed. The dispersion and spreadability of PMMA were confirmed by measuring the kinetic friction and optimal content was determined. The silicone rubber powder, DDVDDSC, was confirmed by evaluating the hardness, spreading value, and drop test. Finally, it was found that the dispersion of PMMA and silicone rubber powder affected spreadability. Such makeup cosmetics have excellent stability in drop test while having appropriate hardness, and good stability over time. Taken together, it is concluded that air jet mill process can be utilized as a method to improve skin-affinity and spreadability of the pressed powder.

The Study of Characteristics of Cosmetic Powder by Using Various Grinding mill (화장품용 분체의 분쇄방식에 따른 특성연구)

  • Shim, Seung-Bo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.2
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    • pp.500-507
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    • 2008
  • By Using various grinding mill in powder cosmetics manufacturing process; screen milt and pin mill, jet mill, properties of the powder and grinding mills were studied; talc, mica, nylon powder, silica, titanium dioxide. Besides, the experiments fur evaluation of grinding were performed by using iron oxides those are tracers. In powders of plate shape, they were grinded more vertically than horizontally at the screen mill and pin mill, although were all grinded vertically and horizontally at the jet mill. The spheric powders became the primary particles or aggregation by electrostatic interaction at the screen mill and pin mill. But, at the jet mill, they resulted the agglomeration or transformation or damage up to 2bar. Titanium dioxides became the primary particles by all grinding mill. Pin mill has an excellent result in experiments which is a change of the tone of color by grinding. From these results, suggest that the jet mill is used to pre-treat of powders of plate shape in practical cosmetic manufacturing process, and the screen mill and pin mill are used to match the color of powder cosmetics. If industrial process condition is taken into consideration, suggest that 4times of grinding is excellent on grinding effect by the screen mill, and twice grinding by the pin mill and grind air pressure of 1bar by the jet mill.

Physicochemical Properties of Hull-less Barley Flours Prepared with Different Grinding Mills (제분방법에 따른 쌀보리가루의 이화학적 특성)

  • Lee, Young-Tack;Seog, Ho-Moon;Cho, Mi-Kyung;Kim, Sung-Soo
    • Korean Journal of Food Science and Technology
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    • v.28 no.6
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    • pp.1078-1083
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    • 1996
  • During the pearling process of hull-less barley, protein, lipid, ash and insoluble dietary fiber (IDF) contents decreased, while soluble dietary fiber (SDF) and ${\beta}-glucan$ contents slightly increased. Depending on milling methods and types of grinding mills used, there were differences in particle size distribution of barley flour. Flour particle size was smaller in the following order of Fitz mill, Ball mill, Pin mill, Cyclotec sample mill and Jet mill. Color (brightness) was closely related to the particle size of barley flour. Damaged starch (%) in pearled barley flour was the highest in Jet mill among different mills. Flours prepared with Cyclone mill and Pin mill had a reasonable amount of damaged starch. Flour produced by Fitz mill showed the lowest amount of damaged starch. Scanning electron microscopy (SEM) of the flour samples demonstrated different sizes and shapes of particles consisting of starch granules and cell wall materials. Damaged starch tended to increase water absorption index (WAI), water solubility index (WSI), and water retention capacity (WRC). Pasting viscosity determined by amylograph was relatively high in Pin-milled and Cyclone-milled flours. Viscosity was the lowest in coarsely ground flour by Fits mill.

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A Study for Magnetic Orientation Enhancement in Nd-Fe-B Sintered Magnets (Nd-Fe-B계 소결자석의 이방화율 향상을 위한 연구)

  • 김동환;임광윤;김효준;조재완;서응석;김승호;김상면
    • Journal of the Korean Magnetics Society
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    • v.11 no.1
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    • pp.8-13
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    • 2001
  • Effects of casting Processes and lubricant addition were studied to improve remanence of 31RE-68TM-lB based sintered magnet by using axial pressing process. Strip casting was effective to get the fine and homogeneous microstructure without ${\alpha}$-Fe segregation. The strip cast flake resulted in narrower particle size distribution after jet milling with respect to the conventional cast ingot. During pressing step with a magnetic field, the particle alignment was increased by appropriate addition of liquid lubricant. In this study, it was revealed that narrow particle size distribution and appropriate addition of liquid lubricant were essential to improve the grain alignment and thus the remanence of Nd-Fe-B sintered magnet.

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Quality Characteristics of Seasoning with Different Particle Size of Hericium erinaceus Powder (노루궁뎅이버섯 분말의 입도차이에 따른 조미료의 품질특성)

  • Lee, Sun Ju;Park, Ji hyun;Lee, Chan;Moon, Bo Kyung
    • Korean journal of food and cookery science
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    • v.29 no.6
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    • pp.741-747
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    • 2013
  • This study was carried out to investigate the quality characteristics of roll mill, jet mill Hericium erinaceus (HE) powders and seasonings using them (RPS and JPS). Water binding capacity of the jet mill HE powder(JP) was higher than that of roll mill HE powder(RP). The reduction of particle size resulted in the increases of specific surface area and JP showed smaller particle size than RP. $L^*$ of JP was significantly higher than that of RP. In sensory evaluation, the color and the flavor of seasoning showed on significant difference. Control and JPS got significantly high scores in 'Overall Acceptability' than RPS. Based on the results in this study, JPS is considered to have potential to be developed commercially as seasoning.

Physicochemical Properties of Black Rice Flours (BRFs) Affected by Milling Conditions (제분조건에 따른 흑미쌀가루 품질특성)

  • Choi, Bong-Kyu;Kum, Jun-Seok;Lee, Hyun-Yu;Park, Jong-Dae
    • Korean Journal of Food Science and Technology
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    • v.38 no.6
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    • pp.751-755
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    • 2006
  • Physicochemical properties of black rice flours (BRFs) produced under different milling conditions were investigated to explore their applications for various processed rice products. Moisture contents of BRFs after roll milling and subsequent hot-air drying or microwave drying were 10.3% and 14.4%, respectively. The BRFs with jet milling and subsequent hot-air drying or microwave drying showed moisture contents of 7.9% and 7.5%. Mean particle sizes of the BRFs obtained from roll milling, jet milling, and following air-classification were 150, 41.5, and 9.4 ${\mu}m$, respectively. Hunter L value and water soluble index (WSI) of BRFs increased with decreasing particle size, while Hunter a value decreased. Total polyphenol contents of 91.4-115.8 mg/100 g and total amino acids of 75.0-96.4 mg/100 g in three types of BRFs were higher as compared to those (6.3 mg/100 g and 30.5 mg/100 g) of polished rice flour (PRF). Physicochemical properties such as moisture content, color parameter, and WSI have close relationship with the particle size of BRFs prepared under different milling conditions.

Effect of pulverizing method on the particle size of matured silkworm powder

  • Kim, Su-Bae;Kim, Kee-Young;Ji, Sang-Deok;Kim, Seong-Wan;Kim, Nam-Suk;Jo, You-Young;Kim, Jong-Gil;Kim, Young-Guk;Koo, Hui-Yeon;Moon, Hyung-Chul;Seok, Young-Seek;Lee, Hyun-Tai
    • International Journal of Industrial Entomology
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    • v.37 no.2
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    • pp.105-108
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    • 2018
  • Recently matured silkworm powder was developed by RDA. In this study, the effect of pulverizing method on the particle size of matured silkworm powder was examined. FESEM was performed to observe the morphology and to measure the particle size of silkworm powder. Particle morphology of air-jet mill pulverized powder was round and smooth, however, those of roller-mill and hammer-mill pulverized mature silkworm was more harsh and square. Particle size was varied with pulverizing technique as follows; $1.1{\mu}m$ (air-jet mill), $10{\mu}m$ (roller mill), and $120{\mu}m$ (hammer mill), respectively. A proximate analysis results of air-jet mill powder showed that crude protein, crude lipid, crude fiber, and ash was 73%, 12%, 1.95%, and 3.4%, respectively. According to our results, air-jet mell technique might be used to make a tiny matured silkworm powder.

RF-Plasma를 이용한 Ru-Cr 금속합금 분말 제조 및 특성

  • Ho, Jong-Hwan;Im, Seong-Cheol
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • pp.211-211
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    • 2013
  • Ru-Cr은 차세대 반도체 메모리(RAM, MRAM, FeRAM), 헤드(MR, TMR), 캐피시터의 웨이퍼 등에 전극층이나 시드층 형성을 위해 스퍼터링 타겟으로 제조되며, IT산업이 발달함에 따라 수요가 증가하고 있다. 기존의 스퍼터링 타겟은 산처리와 주조와 같은 습식법이 주를 이루었으나, 긴 제조시간과 강산사용의 위험성화 강산폐유의 처리가 문제되고 있다. 최근에는 습식공정을 보완하기 위한 건식법의 연구가 진행 중이며, 합금소재에 대한 건식법의 연구가 필요하다. 본 연구에서는 폐 Ru-Cr 금속합금 스퍼터링 타겟을 Hammer-mill, jet-mill 등 건식으로 분쇄하고 RF-Plasma를 이용하여 소결에 용이한 구형, 고순도 Ru-Cr금속합금분말을 제조하였다.

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