Roll Diameter Requirements in Converting Processes
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1 Roll Diameter Requirements in Converting Processes Siemens Industry, Inc All rights reserved. Answers for industry.
2 Roll Diameter in Converting Processes Roll diameter accuracy is critical in many converting processes v n D??? Roll diameter accuracy = Increased machine performance
3 Roll Diameter in Converting Processes Center Driven Tension Control Starting Diameter Running Diameter
4 Roll Diameter in Converting Processes Center Driven Tension Control (Torque) Tension set point Diameter Taper tension Tension setpoint Diameter Taper Tension Acceleration Acceleration torque Acceleration precontrol J total Drive Inertia Calc Gain Web velocity Override V Diameter Speed setpoint Diameter v n D Winder rotational speed M Web velocity Diameter Calc Diameter
5 Roll Diameter in Converting Processes Center Driven Tension Control (Speed) Web velocity Torque precontrol J total Inertia Calc Gain Web velocity V Speed setpoint Diameter Diameter PID Dancer position fb Web velocity v n D Winder rot. speed Diameter M Diameter Calc c Diameter Tension setpoint Taper tension Taper Tension Tension setpoint / Dancer Load
6 Roll Diameter in Converting Processes Unwind Flying Splice Web Direction Bump Roll Rotating Turret Knife Splice Mark Unwind flying splice requires actual roll diameter for firing the bump roll and knife at their correct positions and speed matching of new roll.
7 Roll Diameter in Converting Processes Turret Indexing Stopping positions of the rolls. Modification of the spindle velocity setpoint during indexing.
8 Roll Diameter in Converting Processes New Roll Zero Speed Splice Splice Tail Cutters Zero speed splicing is diameter dependent for auto splicing at the required minimum diameter. Nip Tail Cutters Depleting Roll
9 Roll Diameter in Converting Processes Gap and Lay-on Rolls Lay on rolls applied in gap winding must precisely follow the roll diameter accurately throughout the winding process.
10 Roll Diameter in Converting Processes Surface Wind Rider Rolls Rider Roll Rider rolls on surface winders require roll diameter to apply the correct specified pressure throughout the roll build.
11 Common Diameter Determination Methods How to get it? Measurement - Sensor Calculation
12 Common Diameter Determination Methods Measurement - Sensor Lay-on Roll Measuring Arm Diameter Sensor
13 Common Diameter Determination Methods Unwind Lay-on Roll Measuring Arm Layon Roll Advantages Rotary Diameter Sensor Tension Controller Simple and robust. Relatively low maintenance. Diameter value does not require spindle or web motion.
14 Common Diameter Determination Methods Unwind Lay-on Roll Measuring Arm Layon Roll Disadvantages Rotary Diameter Sensor Tension Controller Must contact the roll Out-of-round rolls The output signal may require filtering Angle must be transformed to a linear distance. Must be loaded against the roll Roll changing / mechanics
15 Common Diameter Determination Methods Unwind Diameter Sensor Ultrasonic Diameter Sensor Advantages Diameter Linear output proportional to roll diameter. No material contact with the roll. The diameter value does not require motion. Tension Controller
16 Common Diameter Determination Methods Unwind Diameter Sensor Ultrasonic Diameter Sensor Disadvantages Diameter Tension Controller Measurement can be affected by moving air and temperature drift (ultrasonic). Periodic maintenance and calibration. Susceptible to dirt and dust. Low density materials absorb the signal. Damage from roll changes. Does not work well with out of round rolls. Signal typically requires filtration.
17 Common Diameter Determination Methods Diameter Sensors SENSOR LAY-ON ROLL v set ω set v set ω set A/D A/D Acceptable for starting diameter but neither are practical for providing a process running diameter
18 Common Diameter Determination Methods How to Calculate? Calculation Web Velocity / Winder Shaft RPM (V/n) Roll Turns & Web Thickness
19 Common Diameter Determination Methods Web Velocity / Winder Shaft RPM (V/n) Web Velocity / Winder Shaft Rpm (V/n) is the most common method of determining Running roll diameter for center driven spindles. Diameter (D) is determined by using the relationship between surface web velocity (v) and the angular velocity of the spindle ( ) with the calculation v/n. ω
20 Common Diameter Determination Methods Web Velocity / Winder Shaft RPM (V/n) Web Transport Unwind (n) (V) (V), (n) Tension Controller (V/n) = Diameter Drive System
21 Common Diameter Determination Methods Web Velocity / Winder Shaft RPM (V/n) Set D Vact 0-100% 0 - Dmin% filter ms D D(min%) - 100% hold D(min%) n < D(min%) & nact filter ms D(min%) - 100% Legend: V: Line speed n: Rotational speed D: Diameter
22 Common Diameter Determination Methods Advantages Web Velocity / Winder Shaft RPM (V/n) Requires no additional machine hardware. Simple calculation, directly proportional. Provides acceptable steady state diameter status. Disadvantages Must be above minimum line speed for calculation (diameter hold). Filters required for output smoothness. Filter changes may be required for changes in material thickness. Poor accuracy during acceleration and deceleration.
23 Common Diameter Determination Methods Roll Turns & Web Thickness Turns Web Thickness Drive System Diameter (New = Diameter Old + (Thickness *2) Turns Tension Controller Web Thickness
24 Common Diameter Determination Methods Advantages Roll Turns & Web Thickness Theoretically the most accurate diameter calculator. Not susceptible to acceleration / deceleration / speed disturbances. Does not require filtration. Does not require a diameter hold Disadvantages Open Loop System. Web thickness variable must be accurate. Requires an accurate starting diameter
25 Improved Methods of Diameter Calculation Two improved methods can utilized and offer several benefits over the common diameter determination methods Integration of Web Velocity / Spindle RPM Web Position / Spindle Angle
26 Improved Methods of Diameter Calculation Integration of Web Velocity / Spindle RPM In this method of diameter calculation, velocity is integrated over time to determine a linear position change of the web and a angular displacement of the spindle. S r =, D = 2 * r θ The diameter is calculated based on calculated web length (S) and calculated angular displacement of the spindle (Ɵ)
27 Improved Methods of Diameter Calculation Integration of Web Velocity / Spindle RPM Revolution(s) Reset > ππ 1 Nact Sampling Time 0 Fine interpolator Vact Calculating with a web length and a spindle angle provides an increased stability of the measurement and does not require the filtering that is used in v/n. The added stability of this method is especially seen during acceleration and deceleration.
28 Improved Methods of Diameter Calculation Advantages Integration of Web Velocity / Spindle RPM More accurate than (v/n) during acceleration / deceleration / speed disturbances. Does not require filtration. Can be used to also determine starting diameter (Actual position mode). Diameter hold not required. Disadvantages Integral update time must be fast.
29 Improved Methods of Diameter Calculation Actual Web Position / Actual Spindle Angle Calculation Motion controllers and some drive control systems can provide the actual positions of drives controlling the web and spindle Revolution(s) Reset > 1 Spindle Angle 0 Fine interpolator Web Length
30 Improved Methods of Diameter Calculation Starting Diameter Direct operator input (subject to errors) Sensor Measurement Starting diameter with Position DIAMETER D + r 2x θ θ High degree of accuracy! Only possible with a position based control TECHNOLOGY CONTROL F x x
31 Performance Review - Diameter Calculation Methods Comparing the Calculation Methods Next Step, Evaluation of the actual results. The following analysis will look at the three calculation modes under different conditions. Constant speed operation Speed changes & update frequency of the diameter calculator logic
32 Performance Review - Diameter Calculation Methods RED GREEN BLUE - V/n diameter - INTEGRAL diameter - POSITION diameter Constant web speed: 100 m/min
33 Performance Review - Diameter Calculation Methods RED - V/n diameter GREEN - INTEGRAL diameter BLUE - POSITION diameter BLACK - Web Velocity Acceleration profile: 50 m/min > 300 m/min > 10 m/min Update (sampling) time: 6 ms
34 Performance Review - Diameter Calculation Methods RED - V/n diameter GREEN - INTEGRAL diameter BLUE - POSITION diameter BLACK - Web Velocity Acceleration profile: 50 m/min > 300 m/min > 10 m/min Update (sampling) time: 1 ms
35 Performance Review - Diameter Calculation Methods Web Velocity over Winder Shaft Velocity (V/n) V Web Velocity Sample Actual n Winder Shaft Velocity t Sample Actual Sample Periods v1 v 2 v 3 t
36 Performance Review - Diameter Calculation Methods Integration of Web Velocity & Position Based Calculation V ERROR ACCELERATION V CONSTANT SPEED t t s s s s t t t t t Interpolation error does not exist in a position based controller t Increased Sampling rate t
37 Conclusions Roll diameter is critical in many converting processes. By utilizing new techniques and new technologies we can more accurately determine diameter and help converting machines and converting processes to reach higher performance levels.
38 Thank You William Gilbert Siemens Industry, Inc Triangle Parkway Norcross, GA Mobile: +1 (678) Website:
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