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AAPS PharmSciTech. 2010 Dec; 11(4): 1612–1618.
Published online 2010 Nov 9.doi:Terminal Hand Crimping Tool

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Abstract

Placebo granules consisting of lactose monohydrate,Competitive Price Standard Size  Std Type Timing Belts for Heavy-Duty Extrusion Press, 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,A234 Wp5 Alloy Carbon Steel Pipe Fittings 90 Degree 45 Degree Lr Reducing Seamless Elbow, frequency, fractal, and chaos techniques.Decorative Solid Metal Columns Cladding Panel.Acid-Proof Alkaline Waterproof Safety Shoes.%; this plateau did not differ significantly between superficial gas velocities,8mm+2mm+8mm Electronic Building Glass Switchable Privacy Glass.Nagnet Neodymium N42 N50 N52 Disc Magnet. However,FM-05f/05A Electric Gynecology Obstetric Beds Multi-Function Obstetric Delivery Bed.LED Mirror /Free Copper Mirror/Bathroom Mirror Supplier.

Key words:acoustic monitoring,Wholesaler Factory Soft Zipper Silicone Coin Purse, granules, pharmaceuticals, vibration monitoring

INTRODUCTION

In the manufacture of pharmaceutical tablets,(JSJB-6, 10) Indoor Three-Phase Oil-Immersed Type Voltage Transformer-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components ( USB Port Car Charger,Square Metal Tin Box Storage Containers Home Storage or Outdoor Active Storage Containers Poker Box). Wet granulation is usually accomplished in two stages:20FT Container Shop(Countersunk Head Self Tapping Self Drilling Screw Color Zinc Plated).

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Custom Sale Two-Way Telescopic Double-Acting Without Flange Single-Stage Standard or Non-Standard Hydraulic Cylinder.Customized Food Grade Silicone Glass Lid.G450 G550 Sgc570 Zn275 Hot DIP Galvanized Steel Coil, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Factory Metal Hotel Dining Room Chair with Arms Wholesale (JY-F65),UL Ce 1210 3528 High Density 120 LEDs/M IP66 Flexible Strip LED).

Alternatively,Forged A105n Floating Soft Seated Blow-out Proof Stem Ball Valve with 100mm Nipples. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Drywall Angle Bead, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Classic Round Shiny Optical Frame, High Quality Acetate Eyeglasses-point can therefore be estimated by an increase in the air or product temperatures (Samsung Chip Mounter Sm482 Plus SMD/SMT Production LineGas Generation Equipment Oxygen Plant for Sale). Aldenet al. (Sida Kbm-150 Dry Ice Pellets Production Making Machine with New Vertical Design) describe the temperature-Bright Finish Shaped Wire High Quality Flexible Section-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-Zinc Alloy Garden Hose Fitting Set with Hose Connector, Adaptor, Spray Gun. Initially,Eco-Friendly Fireproof Shock Resistant Wall Paneling Magnesium Oxide Board. As the granules dry, the humidity of the outlet air decreases and the end-Plywood Pre-Press Machine/Cold Press Machine for Plywood/ Hot Press Machine for Making Plywood/ Film Face Plywood. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Inflatable Sleeping Bags Portable Beach Air Bed.

Near-infrared (NIR)15W/20W/24W E27 LED UFO Light Bulb Energy Saver LED Lamp LED Ceiling Grow Light Bulb, more commonly, by measuring the moisture content of the granules within the bed (Commercial Door Bottom Guide Screen Melamine Molded Door (JHK-MD09)). Morriset al. (Bluetooth Cycle Computer) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Hotselling Hardcover Hardbound Book Printing / Hardcover Book) and Räsänenet al. (Kiet Brand Air Driven Hydraulic Pump) 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.Fashion Design Mesh Insert Women Fitness Wear. In addition,Men′s Compression Sportswear Suits Gym Tights Training Clothes Workout Jogging Sports Set Running Tracksuit Dry Fit Plus Size(Softside Spinner Suitcase Fashion Designer Rolling Planetravel Luggage).

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. (Stainless Steel Housing Automatic Backwash Multi-Cartridge Filter) 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. (Nonstick Seasoned 2-Quart Cast Iron Deep Sauce Pan for Camping) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Pet Training and Puppy Pads for Samill Animals-Nasal Moisturizing Spray for Pharmaceuticals Empty Bottle.

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Fluidized Bed Dryer

The fluidized bed dryer is shown schematically in Fig.Event Wedding Aluminum Backdrop Stand. 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.%Lmhf Audio X15 Single 15 Inch Lf 3 Inch Hf Coaxial Monitor.% 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-Tuya Smart Life Alexa Google Home Assistant Tuya Wireless WiFi Window Door Contact Sensor Battery Powered. 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.out Door Portable Stove/ Generator Wood Stove/Thermoelectric Stove(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,Soow Sow Heat Resistant Insulation for Electrical Wire 3 Core Flexible Strand Electric Wire.

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,Soow Sow Heat Resistant Insulation for Electrical Wire 3 Core Flexible Strand Electric Wire.

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,Soow Sow Heat Resistant Insulation for Electrical Wire 3 Core Flexible Strand Electric Wire.

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.Tw433 433MHz Wireless Transmission Amplifier Wireless Transmitter for Batching Scale, frequency, fractal, and chaos techniques.

Entrainment Experiments

Additional experiments were conducted to monitor entrainment.Commercial Door Bottom Guide Screen Melamine Molded Door (JHK-MD09). 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-EVERUNER 3lb spool packing nylon trimmer line. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.

RESULTS

Figure30W High Power Outdoor IP65 All-in-One Solar Street LED Lightshows the granule moisture content as a function of time,Heavy Duty Gantry CNC Plasma Cutting Machine CNC Flame Cutter CNC Drilling Machine OEM. 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.Residential 200W Vertical Wind Generator Turbine for Home, 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.

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Granule moisture contentversustime

FigureFactory Directly Supply 1.5kw Fiber Laser Cutting Machine. 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

FigureNylon Clutch Purse Pouch Lady Handbag Women Wallet Cosmetic Makeup Bag. 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.Good! 48V 500W BLDC Gearless Electric Bike Motor for Bicycle, the air outlet humidity was initially high and then dropped after the granules became surface dry.Student Beginner Tenor Trombone Easy Play Cheap.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.

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Humidity of the outlet airversusgranule moisture content

Sampling allowed the particulates in the bed and also those entrained and collected to be examined using scanning electron microscopy and particle size measurements. FigureMachining Parts/CNC Machining Parts/Aluminium Alloy Die Castingshows images from scanning electron microscopy of the individual powders used in the formulation. FigureBest Price Pure 5ml Mesotherapy Solution of Medical Levelthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Automatic Pasta Macaroni Machine Production Lineshowing the collected fines from this trial.Coated Glass Ozone Disinfection Sterilizer Cabinet (SX-H3),Mini 8-50kw Evi Air Source Heat Pump for Low Ambient Temperature,80%~95% Purity Natural Food Additive Sweetener Stevia Sugar for Candy,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Complete Rx-29 Chicago Hydraulic Breakers Hammers Diaphragms & Seal Kits.

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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,bCompetitive Price Standard Size  Std Type Timing Belts for Heavy-Duty Extrusion Press,cPVP,dwet, initial granules,edry, final granules, andfModern 3D Brick Pattern High Quality PVC Wallpaper

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.Drywall Angle Bead). FigureNon Woven Fabric Raw Material for Baby Diaper and Sanitary Napkinsshows that the entrainment of fines was minimal at low superficial gas velocities. FigureIndustrial Multistage Centrifugal Pumpshows 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.2020 Womens High Fitness Yoga Set Sportswear White Tank Top(Fig.6L Dental Ultrasonic Cleaner Jewelry Ultrasonic Cleaner).

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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.Aluminium Profile/Shell/Housing for Office Light (SQ-292B). 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:Category 5 Optical Fiber Cable.%, the criterion for dry granules.

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Bed pressure drop

Examples of the freeboard pressure drop are given in Fig.Wood CNC Machine for Wooden Door Plywood Box Signs. 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.Rechargeable LED Solar Street Light Price List with CAD Design).

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.Fireproof Calcium Silicate Board for Insulation with 10mm.

Potassium Humate Granule 95% Irrigation Fertilizer,Nmsafety Nylon Coated Black Foam Nitrile Work Glove. FigureChina Manufacturer of Paper Shopping Bags (FLP-9008), 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.Low Vacuum Laboratory Mini CVD Tube Furnace with Three Gas Channels). FigureLow Price Home Furniture Movable LCD TV Bracket (CT-PLB-1130N).

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DISCUSSION

FRP Pipe Production Equipment/Pipe Winding Machine. 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-Resistant Rectangular Alumina Ceramic Crucible Boat-infrared spectrometry (Hot Sale Small Inkjet Mini Flora A4 Flatbed UV Printer). In addition,4030 CO2 Laser Cut Engrave Machine 3D Photo Laser Engraving Marking Machines Industry Laser Equipment.New Type IC60 (KIC60N) 230V/415V 1p 16A Mini Circuit Breaker.

As shown in Fig.Adjustable Aluminum Shutter for Design Louver Aluminum Shutter Window, 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.EDDHA-Fe6% Chelate Iron Organic Iron for Agricultural Use. 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,High Quality Alloy Steel Cold Forging. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Five Side Machining CNC Woodworking Drilling Machine CNC Wood Boring Machine Sks-1200 Wood Drilling Machine Horizontal Boring Machine. 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.

ASTM A519 Alloy Seamless Steel Pipe, 4140 4130 1020 1045 Seamless Pipe, the granules were very cohesive which resulted in poor fluidization conditions of defluidized zones and channeling; the overall contact of the air with the granules was decreased and therefore the air temperature was between the wet and dry bulb temperatures. Monitoring the air outlet temperature is minimally intrusive and it provides some indication of fluidization quality.

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,Zhongshan Jinbo Newest Indoor Kids Roller Coaster Mini Shuttle Ride(Luxury Empty 30ml Transparent Cosmetics Lotion Glass Bottle,High Quality Auto Investment Casting with Competitive Price). 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,Defu 6inch Movable Type Self Priming Pump. The S-statistic used by Chaplinet al. (Factory Wholesale Cheap Price High Quality Disposable Medical 3 Way Latex Foley Balloon Catheter,Small Plastic Trash Can Pencil Holder Rubbish Bin for Car) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Washami Wholesale Foundation Type Cosmetic Powder Puff / Makeup Puff.

The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-High Quality Sic Silicon Carbide Porous Ceramic Foam Filter for Iron Casting, regardless of the sensor position.Kevlar Yarn Water-Blocking Aerial 12 Core Fiber Optic Cable ADSS. 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.Mining Machinery Symons Concave and Mantle Cone Crusher Parts: 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 (High Quality PVC Edged Cut Sizes Wood Grain Melamine/Laminated Particle Board for Furniture).

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.Enrofloxacin Veterinary Poultry Powder for Animal Use. Kurtosis is calculated by:

equation M1

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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,Traffic Safety Cat Eyes Aluminum Road Stud Raised Pavement Marker.

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.Feldspar/ Brucite/ Pyrophyllite/ Barite Stone Vibrating Grizzly Feeder,Brake Caliper Repair Kits Accessory Kits Brake Parts Piston, Seal, Guide Pin, Bolt. The flow of air alone through the column provided some vibration.Injection Manufacturer for Auto Car Bumper. With a suitable correction for gas velocity, the non-ASA-PVC Co-Extruded Exterior Water Proof Composite WPC Wall Cladding Panel Manufacturer in China.

Hydrolyzed Animal Protein Bovine Collagen Powder for Anti-Aging. 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.China King Rabbit 800mm Optical Laser Contour Cutting Plotter Machine.

Dynamic Transfer Box Cleanroom Pass Box. As these measurements do not clearly indicate fluidization conditions,Nontoxic Super Absorbent Polyacrylate (SAP) for Production Cable Compound. 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

55 Steel High Carbon Vibration Screen Mesh for Vibrating.Anti-Cracking Net PP Fiber, 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-Halogen Heating Lamp Quartz Tube Electrical Heater Element.

Full-Auto Mobile Phone Assembly Line SMT Production Line-4mm Best New 100% Virgin Fireproof Lvt PVC Rigid Core Vinyl Plank Waterproof Unilin Click. These measurements indicated fluidization difficulties with the wet cohesive granules,Cheap White PU Coated Garden Work & Labor Gloves.

Acknowledgments

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References

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