Slit ng


itting&Rewinding Slitter productivivit y


Over the last Equiipmenqu


canoſtenspendmore timenot running than


U AST anrunning.


The twomain areas of downtime are due to a job change and a roll change - either finished rolls or parent roll. However, even within these causes, there aremany items that build up to contribute to the total downtime. It is also necessary to ensure that themachines are producing good and consistent quality when they are running. To understand the approach that Universal has taken, it is easiest tomove through the slitting process fromunwin d to rewind .


FAST LOADING UNWIND ADING UNWIND


In commonwithmost slitterman faufacturers, Universal offe


ffers a shaftftless unwindwith floor


pick up on its X6 range of slittingmachines (example seen below). The Universal unwind moves vertically up and down to pick up the roll fromthe floor. Unlike pivoting pick-up unwinds, the rollwill always be in the same position on the floor, regardless of diameter, for the arms to engagewith the core. The operator is providedwith a remote control to operate the unwind arms so they can easily check that the chucks are entering the core


fo


says that ifyouanalyse the operat


niversalConve ay


vertingEqu al


st fouryears,UniversalConv


of slittingmachines toimprovmp oveproductivivityand reducetheamountof timethemachineisnot


Equ pmenthas investnv stedheav y ount


quipment


ationof a slittingmachine, it ng


KNIFEI


correctly. Thismay only save 30 seconds per set up, but this adds up to a lot of time .


AUTOMATIC SHEAR KNIFE AND KN FE SET UP


OMATIC SHEAR KNIFE AND RAZOR SET UP


To


Correctly positioning knives, especially shear knives, can result in considerable downtime. Universal has developed an automatic knifefe setting systemthat can set 20male and emale shear knives in under twominutes. By the time a newparent roll is loaded into the machine, the knives are already in the correct position. The systemcan also position the guiding sensor so thematerialwill be lined upwith the knives. Aswell as saving time, the accuracy of the setup is improved and as the knifefe position is known, the cores can be accurately positioned to line upwith the knives. Although shear knives take the longest to set, these benefits still apply to razor slitting. Themale knife


ffe fe holders used as


part of this systemcan hold either razor or shear knives,making it quick to change a cutting systemand allowing amixture of shear and razor if required .


CLOSED LOOP TENSION CONTROL Most slittingmachines are supplied with fferential friction shaftfts to control rewind tension. These shaftfts rely on the control of


CLOSED OOP TENSION ONTROL diffe


iversal Con ertingnverting avilly inthedevelop


ng opment nt


friction to give the correct winding tension. This can change with time. Using load cells tomeasure and control rewind tension i s the only way to ensure your finished rolls are wound at the correct tension. Correct winding tension is essential to ensure good quality rolls are produced. The actual


ot running rewind tension. ng slitting tension without changing th e


winding tension profiles can be recorded as part of the quality assurance record for the rolls produced. Universal also adds an extra tension zone through slitting to increase the


fo


ffers a systemthat reduces the time from when themachine stops to when it starts winding again to under aminute. This is a huge time saving compared to the time an operator normally takes to remove finished rolls, re-core and re-start. Themachine will repeatedly run at this speed - themachine does not get tired or n eed to go fofor a break . As well as saving time, the systemensures the cores are always lined up accurately with the slitting knives andmanual handling of the finished rolls is red uced .


AST FINISHED ROLL UNL ADING When a set of rolls is complete, themachine comes to halt and the operator then unloads the rolls. To reduce this downtime on a duplex slittingmachine, Universal now offe


FAST FINISHED ROLL UNLOADING To “A “An examp


min e sav ngper set up could equal tw


minute saving per set-up uldequal two


Anexample of a 30-mpleofa30- aving qu


addiitional hours of production per day”


add tionalhour of productionperday


However, foformost app flexibility is required, th


ay”


incorporated into Universal’s X6T turret slitter ffo


The fafast unloading technology can be or the ultimate high productivitymachine.


e systemis supplied licationswhere


with the Universal X6 duplex slitter giving the level of perfoformance that could only previously be achieved with a turret slitter .


THE FUTURE OF SLITTIN G Universal believes that this is the


THE FUTURE OF SLITTING future of slitting. Itwill not suit all


applications, but fofor a large proportion of slitting requirements it offe


ffers the chance to


greatly increase the output froma single slittingmachine and also reduce the labour required to run themachine. The technology has been cost engineered tomake the systemaffordable. As an example, a saving of 30minutes per set-up over fo


ffo four set-ups per


day, this equals two additional hours of production per day. If that time isworth £100 per hour this is a saving of £200 each day. Assuming that themachine operates fofor 250 days a year,r, this is a total saving of £50,000 per year, and over a 10-year period the technology has saved £500,000.


www. 28 December/January 2017 w.universalconvertinge nv ng quipment.com gequ www.convertermag.co.u k


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