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W A T L O W

Plastics catalog - 7347 Barrel Heaters

THINBAND Mica

Solutions:

How to Utilize Watlow'sUniversal THINBAND Barrel Stock Program

#1)Take two 127 mm (5 in.) diameterheaters and curve to a 254 mm(10 in.) diameter. Please note that a QUICK CLAMPhas to be addedorder for the heater to fit. This heater is offered next day delivery.#2)Take two THINBANDs as noted in #1 but mix each diameter. For example, 101.6 mm (0.25 in.) and 152.4 mm (6 in.) diameter or a 120.6 mm (4.75 in.) diameter with a 133.3 mm (5.25 in.) diameter equal 254 mm (10 in.). Again you need a QUICK CLAMP. This heater is also offered next day delivery.#3)Take two THINBANDs as in #1 or #2 but subtract a 6.35 mm (0.25 in.) to the diameter and supply without the QUICK CLAMP for same day delivery. For examplefor a 254 mm(10 in.) diameter, anycombination of 248 mm (9.75 in.) should be supplied to fit the 254 mm (10 in.) diameter requirement. The reason you have to reduce your selection size by a 6.35 mm (0.25 in.) is to ensure a gap when tightening the clamp bars otherwise you will run out of gap and the bars will touch before you can tighten the heater completelyto the barrel. This is only necessarywhen QUICK CLAMP is notincluded. Various diameters and widths ofWatlow’s unique patented flexible THINBAND barrel heaters are available with LA terminations for shipment faster than any in the market because of Watlow’s unique stocking program. 1.Install heaters over a cleansurface.2.After installing the unit, begin totighten the clamp screw. The clamping screw is 0.25 inch-20 x 1.25 inch, allen head cap screw. Begin tightening the clamp bars. If the clamp bars appear not to have seated, tap the clamp bars with a small hammer to insure the bars are well seated in the angle formed by the 60 degree bent tab and the heater. Watlow stocks THINBAND barrelheaters ranging in diameters from 76.2 to 228.6 mm (3 to 9 in.) in 6.35 mm(0.25 in.)and widths in 38.1 mm (1.5in.), 50.8 and 76.2 mm (2 and 3 in.). Watlow can combine these sizes, creating a two-piece assembly ranging from 228.6 to 457.2 mm (9 to 18 in.) in diameter, and any combination between 76.2 and 457.2 mm (3 and 18 in.) as a two-piece assembly. This versatility should satisfy almost any require- ments whether millimeter or inch size barrels.Regarding possible slight wattagedifferences from your original heater to your THINBAND replacement, you must keep in mind that about 80 percent of the wattage is required to bring the barrel up to temperature. The 20 percent remaining is used to offset radiation and convection heat losses. So, if you have a 550 watt heater there is no harm in using a 500 or 600 watt stock THINBAND barrel heater.There are three approaches toreceive a THINBAND combination from stock. To illustrate, let’s examine a customer who needs a 254 mm (10 in.) diameter heater but neither the size or width needed is in stock.
Injection Molding Barrel Heaters

Installation Procedures

3.If the bar has multiple screws,alternately tighten the screws as you would the lug nuts on a car wheel 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 circumference of the heater while tightening the screws. This will ensure the heater fit to the barrel is maximized without any air gaps. 6.When installing terminal lugs,torque the top nuts to 30 in-lbs. The bottom nut should not be touched as it is factory torqued to 45 in-lbs. at assembly.7.Retighten the heater after theheater has operated for a short time. Always make adjustments when the heater and cylinder are cold. 45