Vacuum and fluid-bed dryers include Rota-Cone tumble vacuum dryers, horizontal rotary vacuum dryers, and Forberg-II fluidizing dryers. Specializes in packaged systems including heaters and vacuum pumps, and high temperature vacuum PET solid-state equipment.
Hot-air dehumidifying drying systems feature off-the-shelf microprocessor-based temperature controls. HA series hot-air dryers (30 to 3000 cfm) for processing nonhygroscopic materials.
WD series electric and gas dehumidifying dryers for drying hygroscopic materials (10 to 3000 cfm) feature -40 [degrees] F dewpoint (or lower) operation utilizing twin stationary desiccant beds to ensure dependable uninterrupted flow of dehumidified air. WDMR series compact mini-dryers (10 to 50 cfm) designed especially for operation in high humidity environments.
All dryers designed for convenient serviceability and use state-of-the-art controls to monitor drying. SPI and other communication protocols available.
Mass-Flow series drying hoppers from 25- to 16,000-lb capacity feature tank and cone geometry that promotes true mass-flow of all materials, including sheet regrind. Specially designed air distribution system provides true cross-sectional temperature gradient with no channeling or air-flow bypass. Hoppers can be machine-mounted, floor-mounted or mezzanine-mounted. Multiple hopper drying systems available for central drying applications.
Nomad portable drying and conveying cart systems (10-225 cfm) offer maximum flexibility, efficiency and control drying and conveying of materials in a compact design platform. (See ads pp. 281, 301.)
AMERICAN INTERNATIONAL ELECTRIC
Offers six models of hopper dryers with even heat distribution, accurate temperature controller, and capacities from 25 to 880 lb/hr. Dust-collector attachment available.
Also a double-desiccant, regenerating dehumidifying dryer that reduces moisture to -40 F dewpoint. Unit comes complete with snake cooler and 110-lb double-insulated hopper.
BRY-AIR SYSTEMS DIV., BRY-AIR, INC.
Resin dehumidifiers and hot-air dryers for extrusion, injection and blow molding applications. Desiccant-based dehumidifiers range from 20 to 5000 cfm and include from 2 to 28 desiccant beds. Options include digital dewpointers, diagnostics, central drying system, after-cooling coils, and heaters mounted at the hopper for additional energy savings. Larger units include natural gas regeneration and heat recovery coils for energy efficiency. Also dehumidifying powder drying systems in single- or multiple-batch capacities.
Mold dehumidification systems (MDS) are designed to eliminate mold condensation during high humidity periods. Surrounding the mold enclosure with dry, dehumidified air, MDS-3 system allows injection and blow molders to reduce cooling cycle times up to 30%.
CACTUS MACHINERY INC.
Cactus super dryers in four sizes for processing engineering resins to 75 lb/hr within 30 min of start-up. An alternative to batch-type desiccant drying, Cactus system operates on a continuous basis. Small amounts of resin are heated quickly to force moisture to pellet surface. Compressed air-powered venturi creates air flow across resin to transport surface moisture from resin. Low-wattage heater bands reportedly reduce electrical consumption to 80% less than comparable desiccant dryers. With no moving parts, maintenance is virtually eliminated. Microprocessor controls maintain accurate and constant temperature inside dryer for consistent-quality parts. Predrying is not required.
CARRIER VIBRATING EQUIPMENT
For drying various sizes and types of pellets, offers its 12-in. x 15-ft, 1-hp stainless-steel conveyor dryers with unit and hood insulation and low profile to fit together with in-line equipment. Air temperature and volume controlled to maintain pellet quality.
For drying PET chips in a bottle recycling process, offers two-zone, stainless-steel, 2 x 10 ft, 2-hp, fluid-bed dryers furnished as a system with auxiliaries, which include steam coils, noise attenuators, dust collectors, slide gates, valves and discharge-drum covers. Air temperatures and volumes controlled to dry chips to specified levels and prevent melting or fusing.
CARTER-DAY INDUSTRIES (CANADA)
SpinAway centrifugal dryer for cost-effective drying of flakes or pellets. Capacities from 100 to 110,000 lb/hr, drying to moisture levels to less than 0.05%. Dryer has reinforced rotor-lifter-plate design for extended rotor life. Logarithmic lifter-blade spacing in the rotor design increases the pellet resident time, enhancing drying; and horizontal air-flow forces water and air through the screen rather than out the pellet discharge. Unit requires minimal space, low horsepower, and is designed for continuous, uninterrupted production. Accessories include dewatering units, moist-air exhaust fans, air preheaters, internal washdown spray systems, hardened rotors, pellet-free rotors, and low-noise construction.
CINCINNATI MILACRON PLASTICS TECHNOLOGIES GROUP
Line of dehumidifying dryers are machine-mounted, portable, or floor-mounted with air-flow ratings of 25 to 2500 cfm. Modular, insulated stainless-steel hoppers sized to the requirement and designed for balanced flow of dry air. Also included are an aluminum mounting casting at the throat and a slide gate. Microprocessor controls feature large digital display of set and actual temperature, alarm codes, and cam-cycle sequence codes. Units utilize solid-bed design with low-watt-density Calrod heaters. Options include high-temperature package (300-400 F), hopper-mounted process-air heater, and precooling coil. Hopper options include drawer magnet, vacuum take-off, and low-level alarm. (See ad p. 53.)
COMET AUTOMATION SYSTEMS INC.
Series SD dryers for drying resins at a rate of 15-100 lb/hr. Dual desiccant beds provide low dewpoint of -40 F with completely automatic regeneration cycle. Space-saving construction permits on-machine or separate mounting. Solid-state temperature control enhances reliability. Dryers constructed so that all metal that comes in contact with plastic is stainless-steel, thus preventing contamination from corrosion. Also Series CDD dryers for drying resins at a rate of 85-3000 lb/hr.
THE CONAIR GROUP, INC.
New DM-1 drying monitor provides accurate, real-time information on all four key parameters of the drying process: temperature, air flow, drying time (at temperature), and dewpoint (with optional dewpoint meter). Monitor can be integrated into any Conair CD electric dryer or used as a stand-alone unit with any Conair or non-Conair dryer. Four parameters are programmed by the user: material bulk density, required throughput rate, drying temperature, and drying time. DM-1 signals go/no-go conditions with readouts pinpointing problems caused by reduced air flow, improper hopper or dryer size, unsuitable dewpoint levels (if optional dewpoint meter is included), loss of material flow, improper temperatures, or power failures. Visible alarms can be connected and the monitor can optionally be wired to shut down the machine under any alarm condition. Optional serial port can be included to connect a printer for print-out drying performance reports.
CDG gas-fired dehumidifying dryers for high throughput processing can provide up to 80% energy savings compared with similarly sized electric heat dryers. Efficient, ceramic fiber matrix, flameless radiant burners heat both the process and regeneration air. Separate burners provide indirect heating of both air circuits. Units meet or exceed the National Fire Protection Agency code #86.
Patented "carousel", multiple desiccant cartridge design is featured in CDG, Carousel CS, CompuDry and SC series dryers. Carousel system eliminates dewpoint and temperature variations by controlling the temperature of freshly regenerated desiccant and cooling it to a suitable drying temperature by using a small portion of the drying return air. No ambient air is excluded from the system. As fresh desiccant is introduced, saturated desiccant cartridges are indexed into the closed-loop cooling circuit regeneration.
Economically priced CS series dehumidifying dryers includes models from 100 to 800 lb/hr drying capacities and a simplified microprocessor control.
CompuDry dryers include a microprocessor control with programmable delivery air temperature settings, high- and low-temperature lock-out, alarm-band settings, and an autostart timer. Energy saving options include PowerMiser 1 to automatically signal and initiate desiccant regeneration and/or PowerMiser 2, which automatically adjusts the volume of process drying air needed for actual material throughput. Control options include SPI protocol for communicating to primary processing equipment, in-line moisture monitoring, cfm monitor, filter check, plasticizer trap, and return-air dust collector. CompuDry dryers available with throughput capacities from 90 lb/hr to more than 5000 lb/hr. High-heat versions of CompuDry and CDG gas-fired dryers offered for drying at temperatures above 250 F. Conair drying hoppers supplied for these dryers have "no tool" cleanout and access and a 60 [degrees] cone for enhanced material flow.
SC series mini-dryers with capacities from 7.5 to 100 lb/hr depending on material type feature a closed-loop design and three rotating desiccant cartridges to eliminate temperature and dewpoint spikes. Separate blowers for drying and regeneration air circuits exclude humid ambient air from the process drying circuit. Units include a stainless-steel drying hopper and can be mounted directly on the machine throat, provided with a floor stand for beside-machine location or configured as an MDC mobile drying/conveyor system with both hopper and dryer on a mobile platform and material-conveying blower transferring materials to the machine throat using dry air. Larger dryers may also be used for an MDC system, which minimizes on-machine inventory and allows fast material changes.
Three models of crystallizers are offered for conditioning PET scrap. Either gas or electric heat models are available to change material from an amorphous state to a crystalline state at rates of 500, 1000, or 3000 lb/hr. A modular design allows complete clean disassembly for cleaning.
DRI-AIR INDUSTRIES, INC.
Line of desiccant dryers and drying systems for throughputs from 2 to 400 lb/hr. Arid-X line of dryers is a fully automatic dual-bed design, which produces -40 F dewpoint air. Units come in beside-the-press, portable, and hopper-mount models.
Portable series features Arid-X automatic regenerating dryer, drying hopper, and closed-loop conveying system integrated on a compact castered floor frame. Only a small filterless receiver mounts to machine feed throat, eliminating heavy machine-mounted hoppers. Material changes are simplified because drying components are located on the floor. Dual-hopper models available for on-the-fly material changes.
New off-the-press mixing/drying system for virgin regrind and colorant, designed for quick material changes, mixes resins and colorant before conveyance to the molding machine. System has three hoppers and three augers for operating flexibility. Any auger not in use can be deactivated. System can be remotely located for dustless operation, especially important in a clean room molding environment. Hoppers and other components easily accessible from the floor for cleanout.
New microprocessor control has multiple regeneration control, which allows for select regeneration based on dewpoint, temperature, or time basis. Standard features include a -40 [degrees] F moisture monitor, seven-day timer, diagnostic functions, and RS232/SPI capability.
FASTI USA INC.
The Economical Resin Drying System (ERD System) is a new design to heat and dry raw materials in two steps inside one hopper using very dry process air in an open circuit and a secondary air stream in a closed loop. System uses compressed air for the drying process. ERD-Dryers available in both single and central applications for material flow rates from 1 to 4500 lb/hr at temperatures between and 400 F.
FOREMOST MACHINE BUILDERS INC.
Dehumidifying hopper dryers in a range of drying capacities. Design reportedly uses less electricity than conventional units for equivalent throughput. Features include crossflow regeneration for extremely low dewpoints with no spikes. Standard high-heat/PET models available.
GALA INDUSTRIES, INC.
Centrifugal dryers to process up to 100,000 lb/hr of thermoplastics and elastomers. Drying process takes place in three phases. In the dewatering phase 9095% of water is removed by impact and gravity. Vertical predewatering screens provide a large screen area in a small space. In the impact phase the product is forced spirally upward from the bottom to the top of the rotor area, reducing water content to between 0.5-1.0%. Final phase takes place in the upper part of the rotor area as dry air passes through the spiraling product. Surface moisture of nil to 0.05% can be reached on most smooth, warm products. Dryers feature stainless-steel construction, pellet-free rotors, quick cleanup, low noise, and need only a small area for installation. Options include agglomerate catchers, exhaust blowers, inlet and outlet inspection windows, wear-resistant coating and heavy-duty construction for abrasive polymers, air heaters, safety lock door systems, and pellet water tanks. (See ad p. 164.)
Granulate dryers up to 500 F with a uniformity of [+ or -]9 [degrees] F available in truck-load or shelf-load design. Standard stainless-steel interiors, continuously welded liners, and HEPA filtration prevent contamination. Optional explosion-resistant design and customization available.
HAMILTON AVTEC INC.
Accudry dehumidifying dryers for critical drying applications, and the 2000 series hot-air dryers for nonhygroscopic applications.
Ten models of automatic desiccant dryers use a molecular-sieve desiccant to trap moisture within a closed drying system. Several desiccant cartridges are provided, which are periodically indexed to a regeneration cycle. Programmable microprocessor controls provide LCD messages for initial settings and performance data and alarm conditions.
Hot-air dryers come with an integrated, stainless-steel-lined drying hopper that mounts on the processing machine. Floor-mounted models available. Seven models provide drying ranges from a few lb/hr to more than 1000 lb/hr, depending on material type. An air-flow regulator balances blower cfm for drying efficiency.
HURRICANE PNEUMATIC CONVEYING
Resin dryers with drying hoppers ensure constant -40 F dewpoint air or lower. Precision air-temperature controls maintain an accuracy of [+ or -]2 F. Advance warning systems reduce downtime. Optional dewpoint control systems for dewpoint quality and energy savings.
Three styles of hopper dryers for use at the press include Model HAD751 low-cost, hot-air unit for use with nonhygroscopic materials that can serve more than one press. Model MD75050 refrigerant-type dryer suitable for many hygroscopic materials. RD-Series desiccant dryers use four rotating desiccant beds for consistent low dewpoint. A variety of convection and forced air-type drying ovens also available. (See ad p. 283.)
Desiccant dryer/loaders (DDL) combine loading, desiccant drying, and automatic regeneration in one compact unit. Features a floor-mounted control panel with functions displayed by graphics and light signals. Residual moisture levels down to 0.02% are achieved. Units operate on low power, have hopper-magnet shutoff slide valve, discharge valve /or easy material change, and come in nine sizes. Also DDL-HT for drying PET bottle resins to moisture levels of 0.002%.
Mobile desiccant dryer/loaders (DDM) combine in one mobile unit the dryer, desiccant, automatic regeneration, and automatic conveying of dried material to process machine using predried hot air. Special discharge fitting acts as level control on process machine hopper. DDM can feed two process machines at the same time. Available in three sizes with the Con-Evator three-phase hopper loader.
Desiccant central dryer (DCD) dries one or more granular materials to less than 0.02% moisture in one or more drying hoppers using a central power pack, which comes in six sizes. Hoppers have individual heaters and temperature controllers, making it possible to dry different materials at the same time.
Conti-Crystallizer (CC) designed to be a fully automatic continuous crystallizer for amorphous PET and regrind is compact, easy to operate, and has a built-in conveyor. Unit has PLC controls with a touch-sensitive operations monitor that displays information in easy-to-understand messages. Conveying hopper has a level control, which ensures crystallization of equal amounts of raw materials in each batch. Crystallization hopper is insulated and equipped with air distributor and heavy-duty mixing screw that keeps material constantly moving, ensuring no clogging or blockages.
LITTLEFORD DAY, INC.
Dryers and drying systems for resin powders, pigments, pellets and other particulates in conjunction with mixing, blending, processing and reaction. Vertical conical Mark II processor/mixer drying systems can handle up to 1400 cu ft/batch. Jacketed, vacuum or pressure designs available.
LYDON BROTHERS CORP.
Three standard electrically heated, resin-tray drying ovens include Model 1330-1-T3, 12-tray small lab unit with average capacity of 100 lb; Model 1330-2-T3, medium 24-tray unit with 200-lb average capacity; and Model 1330-5-T3, 40-tray unit with capacity to 600 lb.
Standard systems include indication of temperature to 350 F, timer, and high limit. Options to customize ovens to the process include desiccant systems, dewpoint instruments, recorders, chillers and filtration. Custom industrial ovens for drying, PTFE sintering, aging and curing, preheating, decorating, annealing, and thermoforming.
MATSUI AMERICA, INC.
DMZ drying systems feature desiccant rotor that spins and regenerates continuously, constantly feeding fresh desiccant to process. The resulting supply of stable, low dewpoint air substantially increases dryer performance. Main benefits include short drying times (PC in 1.5 hr), better drying performance, quicker material changes; lifetime dessicant, which eliminates replacement, bad product produced by wornout beds, and costly downtime; and standard high-quality stainless-steel drying hopper, aftercooler, and microprocessor control. Systems reportedly reduce energy consumption by 15% to 45%.
Dryers with closed-loop cooldown use dry regeneration air to cool the regenerated beds, rather than a bleed of high-moisture return air. Heat is dissipated through a series of closed-loop tubes, resulting in very dry desiccant for longer process cycles, reducing the number of energy-intensive regeneration cycles required.
New Luxor dryer utilizes a closed-loop regeneration and bed-cooling system for continuous low-dewpoint, spike-free drying. Dryer has stationary desiccant beds, quick-acting bed switching valves, and change-in-place desiccant capabilities. Luxor drying systems utilize direct "at-the-bin" heating of process air to ensure precise temperature control and maximum heating efficiency. Patented ETA heat-recovery system and ETA drying bins afford additional energy savings and efficiencies.
All dryers available in various drying capacities from 200-1500 lb/hr for a central drying system.
Beside-the-press dryers range from 30-120 lb/hr and feature the same drying technology as central dryers. Also available with integrated vacuum-conveying systems for a complete beside-the-press materials-handling and drying system. All Motan dryers have optional self-diagnostic controls that monitor critical drying functions and display problem-solving diagnostics, allowing quick detection and resolution of fault conditions. Other feature components include insulated drying bins with sight-glasses and a front-mounted clean-out door for easy access. Purge valve kits feature company's self-cleaning design.
Wide range of standard dryer and hopper configurations and custom systems. Electromechanical controls with a solid-state PID temperature controller are standard. A choice of microprocessor controllers available as options.
Machine- or floor-mounted hopper/dryer packages with capacities from 15 to 50 lb/hr utilize a dual-tower process with fully automatic regeneration. Modular stainless-steel hoppers are standard in either insulated or noninsulated versions. Optional microprocessor controls available with 40-character alphanumeric LCD or 40-character alphanumeric vacuum-fluorescent display.
Series of self-contained portable drying and conveying systems with closed-loop material conveying and JIT vacuum receivers available in 15-, 25- and 50-lb/hr configurations.
Floor-mounted drying systems with capacities from 50 to 4000 lb/hr and hopper capacities from 200 to over 20,000 lb may be equipped with optional microprocessor controller, which has an 80-character alphanumeric vacuum fluorescent display that monitors and controls 51 drying functions displaying verbal messages and corrective actions. Other features include a "help" key, pass-code access, and a Quick-Set menu, which allows preprogramming of drying parameters for up to 10 different resins.
Complete line of central drying systems from 40 to 4000 lb/hr for custom drying multiple materials at different temperatures and throughputs simultaneously. A central dryer provides guaranteed -40 F dewpoint air via a custom-designed closed-loop air distribution manifold system to a series of multiple hoppers, each equipped with heater/blower assemblies. Each heater/blower supplies individually heated dehumidified process air to a dedicated material hopper, and may be isolated or put in service as desired. (See ad p. 280-Tab.)
PLASTIC PROCESS EQUIPMENT INC.
Redesigned PPE P-161 dehumidifying hopper dryer offers an increased refrigeration unit rated at 5280 Btu/hr and is controlled by a PID digital temperature controller with dual LED readout that displays setpoint and actual discharge temperature reading. Other features include recessed control box built into unit, overheat safety switch that shuts off heat if temperature rises beyond 450 F, fuse-protected internal wiring, pressurized heating chamber with baffle to balance air flow over heating coil, washable intake filter, separate control switches for using unit without dehumidifier in dry weather, standard 2-in. hose outlet connection, 7.5-kw Nicrome heating element, 1-hp blower, 4-in. mineral wool insulation, and 1/2-hp dehumidifier. (See ad p. 220.)
PLASTICS ANCILLARIES CORP.
Line of dryers, all with dual regenerating desiccant beds and fully insulated hoppers.
REGENCY SALES, INC.
Dehumidifying dryer has multidrying beds of molecular sieves, which give a clean-drying low dewpoint (-40 F) without the aid of a chiller. Drying beds have a high void ratio and feature low pressure drop. Recirculating vacuum-type system accelerates drying to less than two hours on hygroscopic materials such as polycarbonate.
STOKES VACUUM INC.
Line of batch vacuum dryers and ancillary equipment includes heating systems, vapor condensers, vacuum pumps, and controls. Conical vacuum reactors used to solid-state PET, PEN, PBT to elevate IV levels with working capacities to 775 cu ft. ISO 9001 certified.
SUNSPOT PRODUCTS CO.
Quick-Dry small-batch dryers can dry up to four materials at a time. Expand output of existing desiccant dryers.
TEW ELECTRIC HEATING EQUIPMENT See American International Electric.
Dri-Pak 12/24 compact hopper and dryer unit mounts on feed throat of injection molding machines. Comes in two sizes: 12 cfm unit with drying capacity of 12-15 lb/hr and hopper capacity of 48 lb at 35 cu ft bulk density; and 24 cfm unit with drying capacity of 24-30 lb/hr and hopper capacity of 100 lb.
Dryers feature a single-bed, single-blower system with high-pressure regenerative blower. System is "off-stream" for 11% of the total cycle time for regeneration. Airflow during the process cycle is increased so that average cfm is at least equal to the dryer rating. System has a microprocessor-controlled digital temperature display. Insulated hoppers for both sizes are optional.
Line of resin dryers matched to hoppers that uniformly expose resin to drying air includes TD series desiccant dryers in 16 models with airflows from 12 to 2000 cfm. Units feature indexing, three-bed design with closed process-air circuit. Design allows in-process cool-down of the regenerated bed with recovery of residual regeneration heat and cooldown with the dry process stream rather than with ambient air. Optional Tech II microprocessor control has seven-day timer with battery backup, display of operating parameters, alarms, and system-operating diagnostics.
H series hot-air dryers available in 11 sizes with airflows from 12 to 2000 cfm. Units heat and circulate air through the resin, removing any surface moisture, and are for use on nonhygroscopic materials. Often used to remove condensation from materials brought into a warm plant from cold outdoor storage. (See also Materials Conveying and Metering and Feeding.) (See ad p. 289.)
UNIVERSAL DYNAMICS INC.
DHD series dehumidifying hopper dryers with process airflow up to 3000 cfm and low dewpoint to -100 F (average dewpoint-40 F). Units have minimum of moving parts; clamps provide easy and quick access to the regeneration heater, process heater, and desiccant beds. Designed for safety and efficiency, heater packages use tubular elements, double-wall construction and insulation, reducing power consumption. Tubular heaters with low-watt density increase heater life. Multiple electric heater elements provide redundancy and extend heater life. DHD series comes with a PLC or microprocessor controller. Two expanded versions of closed-loop microprocessors optionally available, all with SPI communications protocol capabilities. Hoppers range in capacity from 300 to 25,000 lb. Gas-fired DHD dryers also available.
UDC series dehumidifying hopper dryers in four models ranging from 15 to 150 cfm. Standard features include microprocessor controls, material saver function with automatic temperature setback to a maintenance level, stainless-steel and aluminum internal components, mirror finish stainless exterior, digital dewpoint monitor, and SPI communications protocol. Standard configurations include hopper mount, floor mount with process air heater located in dryer enclosure, or floor mount with process air heater mounted remotely on the hopper for optimum efficiency. Dryers complement modular hoppers and combine to create modular drying systems in a variety of configurations.
Dehumidifying desiccant dryers with microprocessor controller feature dewpoints of -40 F; electronic temperature control; process-air filter with cyclone and cartridge; cycle rates of 8, 12, and 16/hr; no moving parts except two four-way valves in the blowers; hopper clean-out door and large sightglass; 20 through 3000 cfm size range with hopper capacities to 12,000 lb; direct-drive fans; location of desiccant inside towers and heaters outside in separate boxes; and drawer-type process-air heaters mounted externally.
Microprocessor-based control panel, which controls and monitors all dryer functions, available with graphic presentation. Process-air temperature selected manually and maintained with solid-state electronic temperature control.
Also hot-air dryers and preheater units for use with nonhygroscopic materials from 85 through 3000 cfm. Units have solid-state electronic temperature controls. Process heaters, mounted externally, are drawer-type that slide in and out. All units are compact, accessible from the exterior, and furnished with direct-drive fan.
WEBB TECHNOLOGIES LTD.
Thermodynamic plastic dryers utilize the application of radiant conducted heat to accelerate the drying process and are intended for use with molding or extrusion machines processing up to 50 lb/hr of material.
WHITLOCK See AEC/Whitlock
THE WITTE CO., INC.
Vibrating fluid-bed, continuous dryers/coolers provide rapid drying and/or cooling. Vibration of the dryer, coupled with the fluid-bed design, provides a unit not sensitive to exact air flows or bed depths, while still providing "first-in-first-out" flow. Other features include ease of cleaning, negligible maintenance, and gentle handling of product for essentially no particle degradation.
WYSSMONT CO., INC.
Turbo-Dryer has only two moving parts: tray/shelf assembly and fan assembly, both rotating independently in a fixed sealed housing.
Wet feed enters the Turbo-Dryer through a feed chute in the roof of the housing and flows onto the first shelf. Shelves are circular with cut-out center and radial slots and are rigidly mounted on an inner supporting frame, forming a vertical stack, which rotates slowly as a unit. Material flows onto each shelf from the one above, forming a pile. The rotation of the tray/shelf assembly carries the pile past a stationary blade set to level the pile to fill the tray at a uniform height. At the end of a revolution, the tray segment meets a second stationary blade set to wipe the tray clean of material. Material is held stationary by the wiper blade, while the tray continues its rotation. It flows through the radial slot onto the shelf below where the cycle is repeated and then progresses downward from shelf to shelf through the dryer and is discharged through a chute in the housing bottom.
Air or other drying medium is fed to the Turbo-Dryer through a side-mounted vertical manifold with control dampers. Air moves inside the dryer by centrifugal fans mounted on a single vertical shaft. Fan assembly fits into the shelf assembly, rotating independently of the shelves. Drying medium leaves the dryer through a roof exhaust.
Turbo-Dryer housing, totally sealed, encloses and supports both tray/shelf and fan assemblies; supports stationary parts of the dryer, wipers and levelers; and consists of a metal frame and insulated side panels, roof, and bottom.
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|Title Annotation:||1998/1999 Manufacturing Handbook & Buyers' Guide|
|Article Type:||Buyers Guide|
|Date:||Aug 1, 1998|
|Previous Article:||Metering, feeding and blending.|