The vast majority of extrusion applications require the achievement of two primary process goals: maximum output and the lowest possible melt temperature. In the Technically Speaking section of this issue of Akcelerator, we discuss and evaluate the most common methods used for measuring melt temperature. In Product News you'll find exciting information about our tri-extrusion system and direct-coupled co-extruders. Worth Noting introduces two new sales rep organizations and AKt Now offers more AK discounted specials.

If you're planning to attend NPE but haven't yet registered, we still have a few complimentary registration forms. Click here and we'll set you up.

TECHNICALLY SPEAKING...

What's Hot?

Melt temperature measurement...
why it's important and how to do it.

Extrusion processors must effectively manage a number of process criteria, including pressure stability (no surging), good mixing, surface finish, physical properties, output and temperature. For most applications temperature and output are the most critical to profitability.

Melt temperature and output are inextricably linked through the common variable of screw speed. Screw speed is the single largest determinant of melt temperature. Before you can manage this important process variable, you must be able to measure it reliably and accurately.

Three Basic Methods Rated

An in-depth technical paper written by Ed Steward, Director of Process Technology can be easily downloaded from our web site. It describes the three basic methods available to extrusion processors for measuring temperature and details their pros and cons. Generally speaking, here's how we rated them.

Immersed Probe. The immersed probe indicated temperatures are repeatable and, therefore, generally the best single solution for in-process measurement. There are, however, several important things to keep in mind when using them:

• Immersed probes should be positioned approximately 1/3 to 1/2 of the diameter of the adapter bore for the most accurate temperature readings.
• Immersed probes should not generally be used in production for degradable compounds such as PVC, wood composites, cross-linked, and foamed materials.
• While the indicated temperature is repeatable with a given material at a given output, it can be 5° to 50° F higher than the hand held pyrometer reading, depending on throughput and viscosity.
  

Exposed Melt Measurement. A hand held contact pyrometer is always a cost effective and useful tool for non-production process development and/or establishing benchmark performance. If your process and budget allow, a continuous infrared system may also be a viable option and will provide melt temperature readings during production.

 

Flush Mounted Thermocouple. In almost all cases a flush mount melt thermocouple will not provide a reading that is accurate enough to be useful.

If you are interested in a detailed review of your specific application(s) please do not hesitate to contact your local American Kuhne sales representative or feel free to email Ed Steward or call him at (860) 886-7745, ext. 114.

-- PRODUCT NEWS --

New Tri-Extrusion System
One Cost-Effective Package
Three extruder complex saves floor space and money.

As an extension of our popular AKcel (AK custom extruder line) series extruder, American Kuhne now offers multiple extruders mounted and wired on a common base and single control panel. This results in a cost effective package with superior space utilization and efficient access to extruders and control functions.

The system pictured includes a 2.5-inch main extruder and two 1.25-inch co-extruders. However, any size main extruder can be combined with any size co-extruders. The co-extruders can be horizontal, angled, or vertical. Co-extruder movement can be by manual hand-wheel, ratchet handle, or fully motorized.

Co-Extruders Now Direct Coupled
Direct-coupled AKcel co-extruders provide positive power transmission at a lower cost.

In our continuing efforts to provide cost effective, technical improvements, American Kuhne now offers our full range of AKcel post mounted co-extruders with direct-coupled motors in addition to belt drive. Stripers and co-extruders including 1/2", 3/4", 1", 1-1/4", and 1-1/2" have all been re-designed to allow for direct coupled drive motors, eliminating the potential for belt slip and the maintenance required by belts.

All AKcel co-extruders have a double reduction helical gearbox, which provides very accurate drive load feedback for precision drive torque control. This eliminates the need for mechanical safety devices such as shear pins and reduces the risk of screw breakage. (For those customers who prefer the flexibility of belts and sheaves, a belt drive is, of course, still available.)

NPE ADVISORY!!

It's almost show time. The National Plastics Exposition rolls (or should we say "barrels") into Chicago June 23-27. Make it a point to visit American Kuhne at booth # 6139. You'll see new products, meet the experts and have a "barrel" of fun.

Not yet registered? We have a few complimentary registration forms that waive the $75 regular admission fee and include a free ($10 value) show directory. Click here for your complimentary form.

See you at NPE!

WORTH NOTING
AK is proud to announce the recent addition of two new sales representatives:

Piekunka Services (818-882-0139) covering all of California and Nevada. Ron and Tom Piekunka have over 45 years of combined experience and are dedicated to serving your extrusion needs.

The Kahl Company (302-478-8450) covering Eastern Pennsylvania, New Jersey, Delaware, Maryland, Virginia, and West Virginia. With over 37 years in business, this service-oriented organization includes four degreed engineers to assist you.

AKt Now!

• Spare Parts. All non-warranty replacement parts are 10% off our standard low prices now through the end of May. Stock-up on rupture disks, breaker plates, clamp heaters, etc.
  
• Name Brand Transducers.
  Save $100 off our already low prices:
  Dynisco AK500 transducer, 0-10,000 psi with 9-inch rigid stem: $610.00
  Dynisco AK502 combination transducer and melt thermcouple, 0-10,000 psi: $640.00

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Tel: 860-886-7775 ● Fax: 860-887-7621