Harrel, Inc.
Contact: Dick Decew Holton Harris
16 Fitch St.
E. Norwalk, CT 06855
U.S.
Phone: 203 866 2573
Fax: 203 866 1483
Harrel, Incorporated , East Norwalk, CT, USA, is the Hi-Tech company in the plastic extrusion field. and in the field of instrumentation. SUMMARY: The following is a summary of the particular areas of specialization of Harrel, Incorporated. For more information, click on the specific item in the "DETAILED INDEX OF HARREL PRODUCTS" which follows this summary. Most items can be ordered on line, and paid for by credit card, if desired. * EXTRUSION LINES AND ACCESSORIES * PLASTICS EXTRUDERS, MELT PUMPS, GEARTRUDERS® , SCREWS. Exceptionally rugged and reliable extruders, melt pumps, and GEARTRUDERS (extruders with integrally mounted gear pumps) . May use 1/4 DIN discrete controllers, multizone controllers, or DIGIPANEL® controllers with 14" full-color display, for TOTAL control of an extrusion line of any type. The Harrel DUOSENSE®, deep-and-shallow-well sensing system is recommended for all barrel zones. Automated setting of trim values with Harrel AUTOTRIM® is optional for all temperature zones. * TUBING AND PROFILE EXTRUSION SYSTEMS -- Turnkey tubing and profile extrusion systems. Plus a complete line of extrusion components and accessories -- extruders, melt pumps, GEARTRUDERS®, extruder screws, dies, cooling troughs, vacuum sizing tanks, laser diameter gauges, pullers, cutters, and classifying conveyors. TUBETROL® gives automated, closed loop control of OD, ID, and length of extruded tubing. BUMP TUBETROL, DOUBLE BUMP TUBETROL, and TRIPLE BUMP TUBETROL give automated, closed loop control of OD, ID, and length of each segment. LIGHTSOUT system gives three shift operation with only two shifts of personnel. MIXTRUDER combines mixing equal to twin screw extruder with TUBETROL system. TUBETROL-PLUS adds automated closed loop control of viscosity, especially for polyurethanes and similar, critical plastics.. * SHEET EXTRUSION SYSTEMS: Turnkey sheet lines, featuring SHEETROL®, a fully automated series of closed loop controls providing control of both the machine direction thickness and the cross-machine thickness profile. Plus a complete line of sheet line components and accessories -- extruders, melt pumps, roll stacks (which meet the new ANSI specs), thickness gauges, and TOTAL control systems for measuring, displaying, and controlling in-line thickness and cross-machine thickness profile for sheet systems of any manufacturer. *MELT PUMP SYSTEMS * MELT PUMPS STABILIZE EXTRUDER THROUGHPUT. The throughput stability of an extruder used alone is relatively poor -- typically 5% to 8% over a period of time. For any type of precision extrusion, or where automated control is desired, therefore, a precision melt pump should be used to meter the throughput to a stabililty of 0.1% typical. Melt pumps also increase output and lower the melt temperature -- important for degradaable polymers. Harrel was a pioneer in adapting melt pumps for extrusion use. For new installations the melt pump control can be an integral part of the DIGIPANEL controller. For existing installations, an upgrade system can be added. *INSTRUMENTATION * EXTRUSION LINE TEMPERATURE CONTROL for extrusion lines of any manufacturer.Harrel developed the plastics industry's first 3-mode (PID) temperature controllers in 1967, the industry's first plant-wide supervisory control system in 1968, and the industry's first microprocessor extrusion controller in 1975, All Harrel extruder temperature controllers are available with DUOSENSE® -- the deep-and-shallow-well extruder barrel temperature control system invented by Harrel. All may also have AUTOTRIM®, the Harrel system for automated setting of trim values. Sizes are 1/4 DIN (4" x 4") for single channel heating only or heating and cooling, 1/4 DIN dual channel for single channel heating only, the CP-641 16 channel multizone unit, the CP-640 30 zone, and the CP-873 60 channel multizone, with 14"full color graphics display. Adding CP-540 slave modules to the CP-873 allows control of any number of zones, even into the hundreds! A complete line of precision temperature sensors is also offered. * GENERAL PURPOSE TEMPERATURE CONTROLLERS: A complete line of temperature controllers for general purpose industrial applications. 1/4 DIN single channel or dual channel, heating only or heating and cooling. CP-641 for 16 channels, CP-640 for 30 channels, CP-873 for 60 channels. Use of the CP-540 slave controllers expands the number of zones to any desired number, in 30 zone increments. A complete line of sensors is also offered. * MILITARY TEMPERATURE CONTROLLERS -- Harrel was a pioneer in mil spec temperature controllers, furnishing about half of the controllers for the Polaris missile, and almost all for the fire control system. Controllers for operation from 400 Hz, 60 Hz, 50 Hz, or from d-c. Output a-c or d-c. Military spec sensors as well. * MOTOR DRIVES & MOTOR SPEED CONTROL. Digital d-c drives to 250 HP. DIGISENSE® give 0.5% accuracy and stability. DIGISYNCH® controls for Harrel drives or drives of any manufacturer control to 0.001%. 1/4 DIN DIGISYNCH modules bring d-c drives of any manufacturer to 0.001%. 1/4 DIN DIGISYNCH modules give exact synchronization of speed of any number of motors -- 0.000% steady-state synchronization error! * PRESSURE CONTROLLERS -- 1/4 DIN controllers control melt pressure in melt stream of extruder of any manufacturer. * MELT PUMP CONTROLLERS. Melt pump controllers control differential pressure across pump. Throughput stability 0.1%! * LENGTH CONTROLLER -- 1/4 DIN Length controller controls extrudate length between two events on extruders of any manufacturer. * VISCOSITY MEASUREMENT AND CONTROL -- VISCOTRUDER rheometer measures plastic viscosity under real-world conditions. VISCONVERTER converts any Harrel TIGER series extruder into a VISCOTRUDER to measure viscosity under real-world conditions. VISCONTROL controls viscosity in an operating extruder, using patented Harrel process. * UPGRADES OF EXISTING PLASTICS EXTRUSION LINES; DIGIPANEL® control systems for total control of extrusion lines made by any manufacturer, melt pump upgrades to attain 0.1% stability in throughput, Upgrades of straight tubing lines for bump tubing, double bump tubing, or triple bump tubing, featuring automated control of OD, ID, and length of each stage. Upgrades of existing sheet lines to add close control of thickness, both in the machine direction and in the cross-machine profile. * STATISTICAL QUALITY CONTROL -- PLANT-WIDE. Harrel introduced the plastic industry's first plant-wide supervisory management and control system in 1968 and was a pioneer in adapting the Deming Statistical Quality Control concepts to extrusion systems. Complete monitoring and control of all lines from central console and existing desktop departmental computers. * CUSTOMER SERVICE, TRAINING, AND CALIBRATION SERVICES. One of the most important factors in selecting a vendor is customer service, both before and after delivery of the product. Harrel offers outstanding service in both categories. And the most important factor (frequently overlooked) in operating an extrusion line is training -- of the operators, the maintenance personnel, engineers, and supervisors. Harrel offers a complete range of training programs -- both on-site and at the Harrel Plastics Development Laboratory. .....and, of course, you can learn about Harrel at HARREL, INCORPORATED. the data on new developments in WHAT'S NEW, and information about how to get to our plant in VISITING HARREL
