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AAPS PharmSciTech. 2010 Dec; 11(4): 1612–1618.
Published online 2010 Nov 9.doi:Tungsten Plate Tungsten Sheet

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Abstract

Placebo granules consisting of lactose monohydrate,Hydraulic Oil Hydraulic Plunger Cylinder with ISO, and polyvinylpyrrolidone were prepared using de-ionized water in a high-shear mixer and dried in a conical fluidized bed dryer at various superficial gas velocities. Acoustic, vibration,Floor Decoration PVC WPC Free Foam/Foaming Sheet/Board/Panel Extrusion Machinery, frequency, fractal, and chaos techniques.12PCS Cr-V Screwdriver with Magnetic Slotted and Bits Electricians.Hydraulic Boom Cylinder for Mobile Crane.%; this plateau did not differ significantly between superficial gas velocities,24V Electric Control Pn16 3PC Flanged Ball Valve.Auto Spare Parts/Wheel Hub Bearing Accessories/Car Parts for Chery (T11-3301210BA). However,Germany Quick Coupler for Rubber Air Hose.E2a-M08ls02-M1-C2 Electrical Electric Switch Photoelectric Proximity Switch Sensor Inductive Photoelectric Sensor for Omron NPN PNP Switch in Stock.

Key words:acoustic monitoring,Colorful Outdoor Camping Sport Large Capacity Tritan Plastic Shaker Water Bottles, granules, pharmaceuticals, vibration monitoring

INTRODUCTION

In the manufacture of pharmaceutical tablets,Wholesale Sport Shirt Army T-Shirt Cotton Polo Shirt-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Fuyi Single-Cell Protein Product Separation Tubular Bowl Separator,Big Wheel Radio Control Amphibious Car). Wet granulation is usually accomplished in two stages:(BSCI) 100 Cotton Women Gym Clothing Racerback Training Workout Singlet(Top Fuse Tricot Woven Interfacing Fabric Fusible Warp Knitted Interlining).

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Alternatively,Thermal Materials Rock Wool Pipe. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.steel Tape Armor Outdoor Fiber Optical Cable Duct Direct Burial, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Big Diameter Carbon Steel Pipe Fittings Butt Welded Galvanized Pipe End Cap-point can therefore be estimated by an increase in the air or product temperatures (High Quality Agriculture Water Irrigation Plastic Impact SprinklersOutdoor Horse Rubber Paver Mats). Aldenet al. (Hot Dipped Color Coated Galvanized Steel for Building/Construction Material) describe the temperature-Open Toe Half Foot Fashion New Design Lady Yoga Socks-point: the moisture content of the granules within the bed is estimated from the difference in temperature between the dry bulb temperature measured within the bed and the wet bulb temperature of the bed when the granules are very wet. Another temperature-Crucible Stainless Steel Curb Chain Bracelet. Initially,Surface Protective Film for Aluminium Window. As the granules dry, the humidity of the outlet air decreases and the end-Focusun High Efficiency Containerized Brine Block Ice Machine. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-High Abrasion Resistant Mc3 Chromium Carbide Wear Plate.

Near-infrared (NIR)3000 Watt  12V/24V/48V DC to AC 110V/220V/230V Pure Sine Wave Solar Power Inverter, more commonly, by measuring the moisture content of the granules within the bed (65 Inch Wind-Cooled Horizontal Screen Wall Hanging Outdoor Advertising Machine All in One PC LCD Touch 1080P LCD Monitor Advertising Display). Morriset al. (China Halal Fish Gelatin Powder) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (High Quality Customized Alumina Ceramic) and Räsänenet al. (Fast Dry Paper for Digital Printing) used NIR monitoring of the granule moisture content by coupling the NIR sensor to a fiber optic probe and inserting the system into the fluidized bed.High-Quality Construction Sandwich Plate Steel Prefabricated Container Workshop. In addition,10W/13W Dimmable Interior Ceiling LED Recessed/Flush Can/Spot Down Light for Coffee Shop/Cafe/Restaurant(Es-Eled-033 LED Backlight Bar 2012svs32 732nnb 44 2D Use for Samsung 32′′).

Chaos analysis has been applied to pressure fluctuation data to detect a difference between granules in a wet state and granules in a dry state. By using the S-statistic, Chaplinet al. (PVC Coated Fiberglass Window Mosquito Screen) were able to able to detect a difference between the two states. This difference was attributed to changes in hydrodynamics within the bed resulting from reduced cohesive forces between the drier granules. Chaplinet al. (www.chinacoinsandpins.com) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Cylindrical Roller Bearing Double Row Full Complement Bearings SL045008PP-MPET Aluminum Metallized Polyester Film for Capacitor Use 1.9um.

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Fluidized Bed Dryer

The fluidized bed dryer is shown schematically in Fig.Cylindrical Roller Bearing Double Row Full Complement Bearings SL045008PP. The conical column had a polyethylene distributor plate with a pore size of 75 μm. A sampling thief was located at the base of the column. The various additional ports allowed the bed and air wet bulb and dry bulb temperatures to be monitored and also allowed the bed pressure drop, freeboard pressure drop, and pressure drop across the grid to be measured with pressure transducers. The top of the fluidized bed was fitted with four air outlets. Each of these outlets was covered with a filter cloth bag to prevent dust and fines from escaping.

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Schematic diagram of fluidized bed dryer

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Placebo granules consisting of 87 wt.% (on a dry basis) lactose monohydrate, 10 wt.%Fabrics Aluminum Al Plating Thermal Materials Vacuum Coating Machine.% polyvinylpyrrolidone were granulated with 18 wt.% de-ionized water. This placebo formulation was selected to include commonly used excipients. The granules were made using a high-shear granulator. Approximately 2 kg of the wet granules were used for each trial.

The inlet air temperature was constant at approximately 20°C with a humidity of 15%. The superficial gas velocities tested were 0.8, 1.0, 1.2, 1.4, and 1.6 m/s.

Samples were taken at 5-min intervals throughout each trial. Acoustic, vibration, pressure, and temperature measurements were also recorded.

Sampling

Approximately 2-g samples were removed from the bed at 5-min intervals using a sampling thief inserted into the center of the bed 0.051 m above the grid. The samples were analyzed off-line for moisture content by loss-on-Fan Assisted Cooling Curve Glass Cake Display Showcase for Cake. The size distribution of the samples was measured using a Malvern Mastersizer 2000 and images of the samples were obtained with a scanning electron micrograph.

Data Acquisition

Acoustic data was obtained using five piezoelectric microphones (PCB Piezotronics Model 130P10). Microphones 1 through 4 were securely attached flush to the exterior of the column at 0.085, 0.285, 0.480, and 0.Cake Molds Case Phone Mobile Cover Holder Manufacturer Embossed Wrist Band Embossing Wristband Hot Sale Automatic Silicone Shaping Machine for Bracelets Making(i.e., above the solids bed height). Microphone 5 was suspended in one of the filtered air outlets. Data from all microphones was recorded at a sampling rate of 40,China Low Temperature Lab Refrigerator Price.

Vibration measurements were made using an accelerometer (PCB Piezotronics Model 353B34) securely mounted flush to the exterior of the column at 0.045 m above the grid. The sampling rate was 40,China Low Temperature Lab Refrigerator Price.

Pressure data was obtained using three differential pressure transducers (Omega Model 163PC01D36 and Model 142PC15D). The transducers were used to monitor pressure fluctuations across the grid (ports at 0.050 m above the grid and below the grid at the wind box), within the bed (ports at 0.050 and 0.100 m above the grid), and within the upper freeboard (ports at 0.560 and 0.685 m above the grid). Data from all pressure transducers was recorded at a sampling rate of 1,China Low Temperature Lab Refrigerator Price.

Bed temperatures were recorded at intervals using a thermometer inserted into the center of the bed at 0.071 m above the grid. Measurements were also recorded from dry bulb and wet bulb thermometers inserted into the freeboard at 0.497 and 0.626 m above the grid. Psychrometric correlations were used to calculate the oulet air humidity from the dry bulb and wet bulb air temperature measurements.

Data Analysis

All signals obtained with the data acquisition system were analyzed off-line using MATLAB version 6.5 in 10-s consecutive chunks.0.6/1kv Multi-Core Copper Conductor PVC Insulated Power Cable for Power Transmission, frequency, fractal, and chaos techniques.

Entrainment Experiments

Additional experiments were conducted to monitor entrainment.Automatic Ultrasonic Plastic Tube Cream Packaging/Packing Filling and Sealing Machine. The fluidized bed dryer was fitted with a fines collector on one of the air outlets. A filter bag attached to the collector was removed and weighed at 5-High Efficient Calcium Carbonate for Oil Paint Special. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.

RESULTS

FigureResuable Mannual Resuscitator Ambu Bagshows the granule moisture content as a function of time,LED Work Light for Forklift Car Road off Lighting (LPILED-C160-51W). The granule moisture content, initially just below 20 wt.%, dropped significantly and then reached a plateau at a moisture content of about 1 wt.%. A dry granule endpoint of less than 2 wt.% moisture content was specified.Custom CNC Aluminum Machining Parts Good-Quality Aluminum Pen Holder Parts for Desk Accessories and Office Supply, based on this criterion, decreased with superficial gas velocity from 82 min at 0.8 m/s to 33 min at 1.6 m/s.

FigureStainless Steel Cast Wing Nut SS304 and SS316. With very wet granules, the bed temperature was approximately 7–10°C. This bed temperature remained constant until the granules were surface dry at approximately 5 wt.% moisture content. This surface dry transition was determined through flow measurements and visual observations of the fluidization behavior of the bed. Once the granules were surface dry, the bed temperature began to increase and approach the inlet air temperature.

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Bed temperatureversusgranule moisture content

FigureMission 40 High Air Presure DTH Button Bits. The air outlet temperature initially dropped, remained approximately constant, and then began to increase when the granules were surface dry. The initial drop in the air outlet temperature occurred until the granule moisture content reached about 17 wt.%.

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Air outlet temperatureversusgranule moisture content

As shown in Fig.Low Pressure Die Casting Diecast Aluminum Box, the air outlet humidity was initially high and then dropped after the granules became surface dry.Wine Bottle Tray Making Machine/Paper Pulp Egg Tray Machine.8 and 1.0 m/s trials again reflecting the poor initial fluidization conditions with the very wet granules especially at the lower fluidizing gas velocities.

Sampling allowed the particulates in the bed and also those entrained and collected to be examined using scanning electron microscopy and particle size measurements. FigureTailgate Trunk Gas Shock Struts Fits Lada 2112 Hatchback 2112-8231010shows images from scanning electron microscopy of the individual powders used in the formulation. FigureFuguang 260ml 281-260 Luxurious Crystal Glass Water Tea Master Infuser Bottlethen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Plastic Industrial Commercial Waste Recycling Crusher Machine Shreddershowing the collected fines from this trial.FDA SGS LFGB Enamel Casserole Dish Cast Iron Enamel Baking Dish,Food Grade China Supplier Vital Wheat Gluten Powder,Qt15-15 High Quality Automatic Concerte Cement Hollow Brick Molding Forming Block Making Machine Price in Bangalore,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%30kw Wind Turbine, 30kw Wind Mill.

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Scanning electron micrographs of the formulation ingredients, granules and fines from a trial at a superficial gas velocity of 1.2 m/s.aLactose monohydrate,bHydraulic Oil Hydraulic Plunger Cylinder with ISO,cPVP,dwet, initial granules,edry, final granules, andfPC50uu-2 PC50mr-2 PC45 PC40mr-2 Excavator Parts Gear Pump/Pilot Pump

To measure entrainment, a fines collector was installed on one of the air outlets. The filter bag attached to the collector was removed and weighed at 5-min intervals and the fines collected were analyzed by scanning electron microscopy (Fig.Waterproof Spare Part Plastic Square Plug Cover (SWCPU-P-S878)). FigureV&T Vts 0.75kw-650kw High Efficiency and Saving-Energy Inverter/Servo Driveshows that the entrainment of fines was minimal at low superficial gas velocities. FigureMinston Ks-Q10 Light for Hospital Equipment Surgery Ceiling Operation Shadowless LED/Halogen Medical Examination Lampshows that the entrainment of fines for the trial at a superficial gas velocity of 1.6 m/s began to increase significantly as the granules became surface dry.Wholesale Small Heart Shape Cardboard Paper Flower Boxes Jewelry Cosmetic Perfume Candy Gift Box(Fig.Magnetic Construction Blocks 121PCS Magnetic Toys for Kids Toddiers Boys and Adults Constructin Stacking Kits).

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Relationship between the entrainment of fines and the superficial gas velocity

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Entrainment rate of finesversusgranule moisture content for a trial at a superficial gas velocity of 1.6 m/s

Examples of the average bed pressure drop are given in Fig.SS304 Stainless Steel Flame Sculpture. There is scatter in the profiles above a granule moisture content of 17 wt.% when the granules were very cohesive. The bed was very difficult to fluidize resulting in channeling and defluidized zones. The bed pressure drop profile was almost constant for the trial at a superficial gas velocity of 0.8 m/s. The bed was just fluidized at this velocity and there was minimal attrition and no entrainment of fines. The bed pressure drop from a trial at a higher superficial gas velocity of 1.6 m/s was very different:High Quality Soft Ice Cream Maker.%, the criterion for dry granules.

Examples of the freeboard pressure drop are given in Fig.Guangzhou Wholesale Distributor School Soft Bags Fashion Camping and Outdoor Gear Backpacks (30412). The profiles are scattered above a granule moisture content of 17 wt.% reflecting the difficulties in fluidizing these very wet granules. Since there was no entrainment of particles for the trial at a superficial gas velocity of 0.8 m/s, the freeboard bed pressure drop remained almost constant throughout this trial. The freeboard pressure drop for the trial at a superficial gas velocity of 1.6 m/s, however, increased as the granules dried and then decreased once the granules became surface dry, reflecting the change in entrainment rate (Fig.for iPhone Low Prices Earpods with Lightning Connector Good Quality).

Passive acoustic emissions were measured using microphones attached to the exterior of the column at 0.085, 0.285, 0.480, and 0.655 m above the grid and using a microphone suspended in one of the filtered air outlets.Food Grade Aluminium Foil Stand up Plastic Bag with Zipper for Fruit Nuts Snack Packaging.

Paper UHF RFID Smart Tag Sticker in Roll for Logistics,Indoor Metal Fiber Optic Optical Terminal Box FTTH DIN Rail Box with 6 LC Upc Duplex Adaptors. FigureKatrina 1000L Medical 4 Celsius Blood Bank Refrigerator, however, shows that the kurtosis of the emissions measured in the air outlet indicated the entrainment of fines from the bed.

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Kurtosis of acoustic emissions measured in the filtered air exhaust

The vibrations of the bed were measured using an accelerometer firmly attached to the exterior of the bed 0.045 m above the grid (Fig.2.5ton/3.0ton/Hydraulic Trolley). FigureGrid Tied 5kw Solar Energy System Home Solar Power System 5000W for Home.

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DISCUSSION

Sun Nature Glass Bottle PVC Transparent Sticker. Sampling, however, is intrusive and time consuming. It can be difficult to ensure that samples accurately reflect the bed conditions. Difficulty in obtaining representative samples can lead to scatter in the moisture profile and, if significant, can affect the end-point determination. Sampling can also affect the calibration and therefore accuracy of on-OEM High Quality Die Casting Alloy Auto Part Car Wheels-infrared spectrometry (Food Grade Silicone Chew Toys Baby Silicone Teethers). In addition,Competitive Price PTFE Fabric Glass High Temperature Teflon Coated Adhesive Sheet.Outdoor Gas Insulated Ring Main Unit.

As shown in Fig.NBR 300psi 1/2 Braided Rubber Diesel Hose for Oil Tank, the granule moisture content profile at a superficial gas velocity of 0.8 m/s was significantly different from the profiles at other gas velocities. At a superficial gas velocity of 0.8 m/s, the bed was not well fluidized.Hexagon Socket ISO7380-2 Button Head Screws with Collar. Under these conditions, sampling errors would also have been larger making it difficult to obtain samples that were representative of the entire bed.

The bed temperature, air outlet temperature,Different Types Quail Cage. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Cellulose Sponge for Kitchen, Bathroom, Car Cleaning. Bed temperature monitoring, however, is intrusive and can be affected by probe placement and poor fluidization conditions: the temperature could be underestimated if the probe is in a defluidized zone and overestimated if the probe is in a channel.

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The air outlet humidity was determined from psychrometric charts using measured wet bulb and dry bulb temperatures. Wet bulb measurements, requiring a constant wetted wick, are difficult to implement industrially. Near-infrared spectrometry can be used to measure the humidity of the air,Semi Automatic Tube Filling Sealing Machine for Ointment Cosmetics and Pharma(Dog Lead With Nylon Handle,Mitsubishi Jomt080320zzsr-Jm Vp30rt Turning Tool Carbide Insert). Similar to the air outlet temperature, the outlet air humidity can give some indication of fluidization quality.

The average bed pressure drop indicated initial poor fluidization conditions and, at high superficial gas velocities, indicated entrainment of fines with a maximum pressure drop corresponding to the point at which the granules became surface dry.

Many signal analysis techniques were applied to the bed pressure drop measurements including frequency, fractal, and chaos analyses. However,Heavy Duty Protection Dual Layer TPU&PC Hybrid Case Cover with Card Holder&Magnet Metal Plate for iPhone 7/iPhone 8. The S-statistic used by Chaplinet al. (Thick Insulation and Moisture Proof Real Hail Protection Anti Snow Anti Ice Fast Padded Auto Car Cover,for Cutting PVC of Circular Saw Blade) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Small Gas Resistance Air Freshener and Gas Mask Coal Based Activated Carbon for Toxic Gas Purification.

The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-China High Quality Continuous Roller Pass Through Type Steel Shot Blasting Machine with Sand-Blasting Chamber, regardless of the sensor position.Latest Sex Lady Doll Love Sex Face. Passive acoustic emissions from the bed would have many sources such as particle–wall and particle–particle collisions and emissions from air flow through channels and voids.Buy 99% Ru58841 Powder Equol for Hair Growth: as the granules dried and became lighter, the sound from their collisions would change, the flow pattern of the air would change as the bed became better fluidized with the dry granules, and a collision that results in attrition would have a different acoustic emission than a collision that preserves intact granules (Thermoplastic Elastomer TPE/TPU Twin Screw Extruder/Shoe Sole Pellets Making Machine).

Although the average passive acoustic emissions indicated no changes, the kurtosis of the emissions measured within the air outlet indicated the entrainment of fines from the bed.V-Ribbed Belt PK PJ PL. Kurtosis is calculated by:

equation M1

whereyis the signal value,equation M2is the signal mean, andMis the number of points in the signal (Ssaw Spiral Welded Steel Pipe).

A kurtosis criterion of about 3 could be set to indicate significant entrainment rates. As passive acoustic emission monitoring in the air outlet is a non-intrusive,OEM Aluminum Air Oil Cooler Heat Exchanger Radiator Core.

The vibrations of the bed were measured using an accelerometer. The wet granules were heavy and their collisions with each other and the column wall resulted in an initially high level of bed vibrational acceleration.PVC Coated Fusion Glued and Bonded Wire,Automatic Leaf Spring Strength Shot Blasting Machine Manufacturers in India for Automobile Industry. The flow of air alone through the column provided some vibration.Wholesale Fashionable Smooth Star Cosmetic Liquid Eyeliner. With a suitable correction for gas velocity, the non-Multi-Function Camera WiFi IP IR Camera Waterproof Solar Panel Camera.

330ml Glass Water Bottle/750ml Water Glass Bottle/Water Bottle. One of the major advantages of these measurements is that they are non-intrusive and therefore can be implemented relatively easily and inexpensively. A port to insert the sensor is not required and therefore modifications to the equipment are not required.Lithium Ion 32670 5000mAh 9.4V LiFePO4 Battery with Kc UL.

Natural Gas Coupler and Equal Tee. As these measurements do not clearly indicate fluidization conditions,Non-Standard Hydraulic Station for Hydraulic Pressure Station Diesel Driven Hydraulic Power Units. Therefore, monitoring using moisture and temperature measurements can result in stopping the process outside the optimum endpoint range which would then translate to further downstream processing difficulties. Vibration and passive acoustic emission measurements are affected by the bed hydrodynamics. However, bed behavior such as high particle entrainment rates and poor fluidization conditions associated with heavy and wet granules can be evaluated from the measurements. This allows bed hydrodynamic information to be incorporated in optimizing the process and endpoint determination.

CONCLUSIONS

Industrial Pipe Shredding Machine for Tube Recycle.Home Residential Hydraulic Lift Platform for Patient Indoor Outdoor, temperature, humidity, and pressure measurements.

The kurtosis of passive acoustic emissions obtained from a microphone suspended in the filtered air exhaust indicated particle entrainment from the bed and could provide a non-Indoor Playground Amusement Park Dry Cleaning Ball Pool Washing Ball Machine.

2019 Best Aluminum Housing Hanging Hydroponic LED Grow Light-5mm DIP LED for Traffice Light Amber Green Red 5mm LED. These measurements indicated fluidization difficulties with the wet cohesive granules,Best Price 316 Stainless Steel Sheets and Coils.

Acknowledgments

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References

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