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Table of Contents◗FUNCTION EXAMPLES“Air Champ” ®TENSION CONTROL (REWIND):A clutch is used on rewindstands to apply constant force(or tension) to a web of paper,film, wire or other material.The clutch must be able tohandle required torque inaddition to dissipating requiredthermal horsepower at thebelted speed of the clutch.◗ SELECTION CONSIDERATIONS:Maximum roll diameter in inchesMinimum roll diameter in inchesWeb speed in FPMWeb width in inchesMaximum rewinder horsepowerWeb tension in pounds per inchof web width◗ EXAMPLESize a clutch for a rewind stand which has apaper roll 25 inches in diameter; a core size of4 inches in diameter. The line speed is 200feet per minute. The web width is 48 inchesand the desired web tension is 1.5 poundsper inch of web width.The torque capacity of Nexen Clutches isusually greater than required to mostcenterwind applications. However, torqueshoud be checked.Torque = ( 1 ⁄2 Max Web Tension) (Roll Dia)(Web Width in inches) == 1.5 (25) 48 = 900 in. lbs.2Select a clutch, from the Thermal horsepowervs. RPM graphs, that dissipates 2.45 horsepowerat 200 RPM.◗ UNIT SELECTED:A TCC-20 ClutchRefer to pages 70-74◗ “AIR CHAMP”PRODUCT CONSIDERATIONS:FW-XHWF-450L-600M-800H-1000The usual practice in rewinding applications isto belt the clutch with a 5% lead (that is, 5%faster than the sheet speed) to take up theslack at the start of winding.Belted speed (RPM)=Web Speed (12) (1.05)Min Core Dia (π)= 200 (12) 1.05 = 200 RPM4 (π)There are several ways to determine the maximumHP to be dissipated by the clutch. First,the web tension must be known or assumed.Then, it is most convenient to determine theclutch HP output required (total HP), and theclutch HP input at the finish of winding (webHP), while maintaining the above required HPoutput. The difference between the two is theHP to be dissipated by the clutch at the finishof winding.◗ CONTROL CIRCUIT:Nexen has a complete electronic TensionControl System which automatically sensestension in a web and compares it to a setdesired tension level. When the web tensionis more or less than the desired level, theautomatic Tension Control System adjusts theair pressure to the clutch to maintain the settension level.DPC9T–15TWeb HP = (Max Web Tension) (Web Width) (Web Speed)33,000= 1.5 (48) 200 = .44HP33,000Total HP Requirement = (Web HP) (Max Roll Dia) (1.05)Min Roll DiaTCC10, 14 & 20= .44 (25) 1.05 = 2.89 HP4HP to be dissipated = Total HP Requirement – Web HP = 2.89 – .44 = 2.45384
Table of ContentsTENSION CONTROL (UNWIND):A brake is used on unwindstands to apply constant force(or tension) to a web of paper,film, wire or other material.Tension is determined by airpressure. Because of thecontinuous slip operation,brakes are generally sized onthermal characteristics ratherthan torque.“Air Champ” ®◗ SELECTION CONSIDERATIONS:Maximum roll diameter in inchesMinimum roll diameter in inchesWeb speed in FPMWeb width in inchesWeb tension in pounds per inchof web width◗ EXAMPLESize a brake for an unwind stand which has apaper roll 24 inches in diameter; a core size of3 inches in diameter.The line speed is 500 feet per minute. Theweb width is 30 inches wide and the desiredweb tension is 1.5 pounds per inch of web width.Web Tension = Web Width x Tension= 30 in x 1.5 lbs/in = 45 lbsFUNCTION EXAMPLES◗ UNIT SELECTED:A XCB-10 Brake with two calipers and .35coefficient of <strong>friction</strong> facings. Refer to pages206-207.◗ CONTROL CIRCUIT:Nexen has a complete electronic TensionControl System which automatically sensestension in a web and compares it to a setdesired tension level. When the web tensionis more or less than the desired level, theautomatic Tension Control System adjusts theair pressure to the brake which maintains theset tension level.Maximum Brake HP = Web Tension x Web Speed = 45 lbs x 500 FPM33000 33,000 ft-lbs/Min/HPMax Torque = Web Tension x Max Roll Radius = 45 lbs x 12 in = 540 in lb Max◗ “AIR CHAMP”PRODUCT CONSIDERATIONS:DIAPHRAGM BRAKESJ, K, 4K, 8K, & 12KMin Torque = Web Tension x Min RollRadius = 45 lbs x 1.5 = 68 in lb MinMax RPM = Web Speed x 12 = 500 FPM x 12 = 636 RPM MaxMin Core Dia x π 3 x πMin RPM = Web Speed x 12 = 500 FPM x 12 = 80 RPM MinMax Core Dia x π 24 x πCALIPER BRAKESDB, BC, BD, VC500 & SPCNOTE: Effective cooling speed = RPM EFF = RPM MIN + (RPM MAX – RPM MIN )= 80 RPM + (636 RPM – 80 RPM) = 265 RPM33SA & TA450-1000Select a brake from the Thermal horsepower vs.RPM graphs, that dissipates .7 horsepower atthe effective cooling speed of 265 RPM.TCB-7,XTB-10, 12, 14, 18, 22XTBA-10, 12, 14, 18, 22BTBA-10, 12385
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Table of ContentsPRODUCTCAT ALOG10-
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Table of Contents◗PRODUCT NUMBER
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Table of Contents◗FAMILY OF PRODU
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Table of Contents◗FAMILY OF PRODU
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Table of Contents“Air Champ” ®
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Table of Contents◗APPLICATION GUI
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Table of ContentsWeb ProductsGUIDE
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Table of Contents◗ MICRO FRICTION
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Table of Contents◗“Air Champ”
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Table of ContentsWeb ProductsIn acc
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Table of ContentsWeb ProductsTENSIO
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Table of ContentsWeb ProductsHousin
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Table of Contents◗ AIR PRESSURE C
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Table of ContentsEclipse SERVOMOTOR
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Table of ContentsEclipse SERVOMOTOR
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Table of ContentsEclipse LINEAR MOT
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Table of ContentsEclipse NEMA AC MO
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Table of ContentsEclipse METRIC AC
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Table of Contents◗ BW MODEL BRAKE
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Table of Contents◗CALIPER BRAKES
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Table of Contents◗CALIPER BRAKESS
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Table of Contents◗DRUM BRAKES“A
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Table of ContentsDRUM BRAKES “Air
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Table of ContentsDRUM BRAKES “Air
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Table of Contents◗HEAVY DUTY BRAK
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Table of Contents◗METRIC BRAKES
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Table of Contents◗BRAKESWeb Produ
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Table of Contents◗TENSION CONTROL
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Table of Contents◗CLUTCH/BRAKES
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Table of Contents◗CLUTCH/BRAKESFM
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Table of Contents◗CLUTCH/BRAKESA
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Table of ContentsCLUTCH/BRAKES “A
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Table of Contents◗METRIC CLUTCH/B
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Table of Contents◗WEB GUIDING CON
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