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Table of Contents◗APPLICATION GUIDETension MeterOften you need to only measurethe tension in a web, not controlit. Nexen has a variety of solutionsto meet these needs.Web ProductsTENSION METERS AND AMPLIFIERSTension MeterNexen tension meters preciselymeasure web tensions with adigital tension display on thefront panel. Their 0-10 VDC or4-20 mA analog output is alsowell suited as a proportional tensiondata signal to process controllers,data loggers and variable-speedmotor controls.You can also use one of thesensors for narrow webs, singlestrands of wire, or any other narrowmaterial where tension will notvary from one side to the other.Nexen tension meters are alsouseful as a tension readout-onlydevice to measure intermediatezonetension.Tension AmplifiersNexen tension amplifiers interfacewith load cell or straingauge sensors. They provide anexcitation signal to the sensorsand separately amplify the returnsignal from each sensor beforecombining them to provide asignal proportional to the totaltension.Tension amplifiers are ideal foraccurate, low-cost tensionmeasurement of a web processinterfaced with machine controlssuch as data loggers, processcontrollers, drive controls, hostcomputers and other applicationsrequiring a precise tensioninterface.Tension Amplifiers Offer:• Low cost signal conditioningfor LVDT or strain gaugetension sensors• Wide tension range forflexible installation• Ideal for use with machinecontrols where localreadout is not required• Includes both 0-10 VDCand 4-20 mA outputsControlled lateral alignment of the web isabsolutely essential to providing high qualityproduct and reducing scrap and waste.Nexen web guiding systems are designed,tested and proven to give you that alignmentWeb Guiding ApplicationsWEB GUIDING SYSTEMSUnwind Guiding (See Figure 1)As material is unwound and fed into amachine, it must be properly aligned with theprocess to be performed upon it.Unwind guiding is accomplished by sensingthe web as it enters the machine. The sensoris mounted as part of the main machineframe and placed so that its center is locatedat the desired position of the web. Thecontroller directs movement of the actuator,which moves the roll stand laterally acrossthe machine to bring the edge of the roll intothe center of the sensor.Intermediate GuidingThis method is normally used in the intermediatezone to make minor corrections inposition. The steering rolls pivot, directingthe web to the left or right to bring it intocenter position within the sensor.26Displacement Guides (See Figure 2)Displacement guides consist of a pair ofpivoting rollers with a pair of stationery idlerollers, one lead-in roller before the guideand a lead-out roller after the guide. Thistype of guide induces pure, out-of-planetwisting of the web, which is gentler on aweb than a steering guide. Much shorterfree spans are required before and afterguiding when compared to a steering guide.Displacement guides are often used onprinting presses and other applicationswhere space is at a premium.Windup Guiding (See Figure 3)The position of the web is monitored by asensor mounted on the moveable windup rollstand, positioned before the last roll on themachine. As the web shifts laterally, thecontroller signals the actuator to move thewindup roll into line with the web edge.Chase GuidingChase guiding is a technique used to alignthe edge of two or more webs or to align aprocess to a web. The sensor is moved bythe actuator to “chase” the edge of the web.In the case of aligning several web edges,the sensors for the second and subsequentwebs are aligned with the chase sensor andmove in tandem with it. This moves the targetor center of the sensor for allsubsequent webs, which in turn causes theguides to align their webs to the target.To align the process to the web, the sensoris mounted to the moveable processcomponent. The actuator then moves thecomponent, causing the sensor to chase theweb edge or printed line.
Table of ContentsWeb ProductsGUIDE SENSING OPTIONSWEB GUIDE SENSORS AND CONTROLLERSPosition Control ConfigurationsAPPLICATION GUIDE ◗Ultrasonic Web Guide SensorLED Infrared Web Guide SensorEdge Position ControlOne edge of the material isaligned with the process at alltimes. The position of this edgeremains constant throughout allprocesses. The opposite edge ispermitted to run free and iseventually edge-trimmed to meetthe final specified web width.Center Position ControlThis technique requires one sensoron each side of the web. Theobjective is to maintain the centerof the web on the mean centerlineof the machine. If the webvaries in width, center positioncontrol will maintain an equaledge trim on each side of theweb, to be removed later in theprocessing.Line Follower ControlLine follower control is alwaysemployed for previouslyprocessed materials, using asensor to follow a line or theedge of a pattern of print orcoating material previously laiddown on the web.Ultrasonic SensorsUltrasonic sensors are used particularlyfor edge or center controlof photosensitive materialssuch as photographic film andprint paper, and with transparentor translucent films bearing acoating, printing or an opaquesurface near the edge. A highfrequency sound is transmittedacross an air gap to a receivingunit. Interruption of the signal isinterpreted as a change in positionof the web material. Theycan also be used with opaquematerials.Infrared SensorsA pulsed LED transmits aninfrared signal across the webedge to a light sensitive sensor;edge position of the material isSplice Detector SystemSplice DetectorSystem ControllerThe Splice Detector System is avisible light system used tosense splices or double thicknessesin translucent materials.It provides both a visual indicationand a relay signal at each splice.determined from the amount oflight sensed at the receiving unit.Infrared sensors can also beconfigured in pairs for centerposition control. The infrared signalis not affected by ambientlight and is useful for processingof certain photosensitive materials.Infrared sensors are usedfor opaque materials only.Line Follower SensorsA line following sensor bounceslight off a web as it passesaround a transport roll in themachine. It is received by asensing element contained inthe same housing. This type ofsensor is normally used to followa printed line or the edge of aprinted pattern on the web.This system is ideally suited foruse where high nippingpressure in a machine must bemomentarily relaxed to allow asplice to pass through withoutdamaging the web, printing blanketor other components.This system typically does notrequire operator intervention. Achange in web thickness ofmore than three seconds durationwill cause the system’s controllerto recalibrate to the newweb thickness.Web Guide ControllerSelf ContainedWeb Guide ControllerAUXILIARY PRODUCTSPaper Checker SystemPaper CheckerThe Paper Checker Systemdetects web breaks and spliceson web machines.This system makes use of anultrasonic sensor to prevent thefalse triggering that can resultfrom the presence of print orWeb Guide ControllersA Nexen web guide controllerreceives signals from a webposition sensor and translatesthem into control signals for webposition drive motors. With theappropriate sensor, they offercontrol accuracy to within±0.004 inches (±0,01mm) of anedge or centerline position.The purpose of the controller isto provide automatic positioningof the web in relation to the sensor.Web position information fromthe sensor is fed to the webguide controller. The controller’smotor control drives anelectrical linear actuator tocorrect the web position byadjusting the roll stand or guideroll mechanism.other patterns on the web materialand for use with photo sensitivematerials. Each break orsplice is indicated by a separaterelay signal and front panel indicatorlights.This Nexen Paper CheckerSystem can be used on transparentto fully opaque webs andwith laminates of paper, film andfoil. It handles web speeds from30 to more than 3000 feet perminute, (10 to 1000 meters perminute).27
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