Barrel Heaters - Hasmak.com.tr

W A T L O W<strong>Barrel</strong> <strong>Heaters</strong>THINBAND MicaHow to Utilize Watlow'sUniversal THINBAND <strong>Barrel</strong>Stock ProgramVarious diameters and widths ofWatlow’s unique patented flexibleTHINBAND barrel heaters areavailable with LA terminations forshipment faster than any in themarket because of Watlow’s uniquestocking program.Watlow stocks THINBAND barrelheaters ranging in diameters from76.2 to 228.6 mm (3 to 9 in.) in 6.35mm (0.25 in.) and widths in 38.1 mm(1.5 in.), 50.8 and 76.2 mm (2 and3 in.). Watlow can <strong>com</strong>bine thesesizes, creating a two-pieceassembly ranging from 228.6 to457.2 mm (9 to 18 in.) in diameter,and any <strong>com</strong>bination between 76.2and 457.2 mm (3 and 18 in.) as atwo-piece assembly. This versatilityshould satisfy almost any requirementswhether millimeter or inchsize barrels.Regarding possible slight wattagedifferences from your original heaterto your THINBAND replacement, youmust keep in mind that about 80percent of the wattage is required tobring the barrel up to temperature.The 20 percent remaining is used tooffset radiation and convection heatlosses. So, if you have a 550 wattheater there is no harm in using a500 or 600 watt stock THINBANDbarrel heater.There are three approaches toreceive a THINBAND <strong>com</strong>binationfrom stock. To illustrate, let’s examinea customer who needs a 254 mm(10 in.) diameter heater but neitherthe size or width needed is in stock.Solutions:#1) Take two 127 mm (5 in.) diameterheaters and curve to a 254 mm(10 in.) diameter. Please note thata QUICK CLAMP has to be addedorder for the heater to fit. Thisheater is offered next day delivery.#2) Take two THINBANDs as notedin #1 but mix each diameter.For example, 101.6 mm (0.25 in.)and 152.4 mm (6 in.) diameter ora 120.6 mm (4.75 in.) diameterwith a 133.3 mm (5.25 in.)diameter equal 254 mm (10 in.).Again you need a QUICK CLAMP.This heater is also offered nextday delivery.#3) Take two THINBANDs as in #1or #2 but subtract a 6.35 mm(0.25 in.) to the diameter andsupply without the QUICK CLAMPfor same day delivery. For examplefor a 254 mm (10 in.) diameter, any<strong>com</strong>bination of 248 mm (9.75 in.)should be supplied to fit the 254mm (10 in.) diameter requirement.The reason you have to reduceyour selection size by a 6.35 mm(0.25 in.) is to ensure a gap whentightening the clamp barsotherwise you will run out of gapand the bars will touch before youcan tighten the heater <strong>com</strong>pletelyto the barrel. This is only necessarywhen QUICK CLAMP is notincluded.Injection Molding<strong>Barrel</strong> <strong>Heaters</strong>Installation Procedures1.Install heaters over a cleansurface.2.After installing the unit, begin totighten the clamp screw. Theclamping screw is 0.25 inch-20 x1.25 inch, allen head cap screw.Begin tightening the clamp bars.If the clamp bars appear not tohave seated, tap the clamp barswith a small hammer to insure thebars are well seated in the angleformed by the 60 degree bent taband the heater.3.If the bar has multiple screws,alternately tighten the screws asyou would the lug nuts on a carwheel to insure even loading.4.Torque all screws toapproximately (9 N-M) 8 lb-in.5.Take a soft rubber mallet and tapgently around the circumferenceof the heater while tightening thescrews. This will ensure the heaterfit to the barrel is maximizedwithout any air gaps.6.When installing terminal lugs,torque the top nuts to 30 in-lbs.The bottom nut should not betouched as it is factory torqued to45 in-lbs. at assembly.7.Retighten the heater after theheater has operated for a shorttime. Always make adjustmentswhen the heater and cylinder arecold.45