6 Maximum pre-stretch level up to 250% Facts & FiguresAlmost 90% of the stretch film demand is in hand wrap and machine wrap applicationsMaximum pre-stretch level up to 250%More than 80% of your film cost price is determined by the resinsEnd users are looking for the lowest price!
7 Are you fulfilling your potential? Are you using optimal outputs/speed?Nowadays modern stretch film lines can run at higher speeds (up to 600 m/min)Older stretch film lines can potentially run faster than being done today!Note: speed also determines the end film propertiesDid you optimise line settings to use the full potential of the resins?Are you using fit for purpose resins?
8 ApproachButene-based SABIC® LLDPE 318B (2.8/918)A state-of-art cast stretch film lineReal world conditions3-layer film concept A/B/C with 15% VLDPE in cling layer and 25% trim recycle in the coreExperimental design15 experiments in 2 daysEasy adjustable variables
10 Cast2020: Settings – Cont. Variable Range Melt Temp. 250 – 290 °C Chill roll Temp.15 – 25 °CVacuum box2 – 4 cm H2OPhoto: SMS Folientechnik GmbH
11 SABIC® C4-LLDPE Film properties Improved by changing settings:Tear resistance TD with 15%Puncture resistance with 60%Ultimate pre-stretch level with 37% (from 230 to 340%)Not influenced by the settings:Optical properties (Gloss, Haze)ClingElastic recovery (snap back)Stress retention (bundling force)
13 Real world testing Semi-automatic Stretch Wrapper ROBOPAC Rotoplat 705 PVSSettingMaximumPre-stretch400%Turntable speed15 rpmWrapping speed60 m/min
14 Real world testing – Cont. BUT(ENE)Looking for the limits we found several holes and film ruptures!we also found consistent pre-stretch levels up to400 %
15 Achieve pre-stretch levels up to 400%!! ConclusionsApply optimal processing conditions to utilise the potential performance present in your C4-LLDPE based filmsTake advantage of the cost price benefits from maximising the use of C4-LLDPEAchieve pre-stretch levels up to 400%!!
17 What about the SABIC® C6-LLDPE? compared SABIC® C6-LLDPE (and C4-LLDPE) with metallocene based-C6-LLDPE and with C8-LLDPECast2020 cast film line3-layer film concept A/B/C concept with 15% VLLDPE in cling layer and 25% recycle in the coreMelt temperature, chill-roll and vacuum box on midpoint settings
19 And there is still room for improvement! ConclusionsUtilising C6-LLDPE can:Improve relevant film properties (e.g. Tear Resistance, Puncture Resistance and cling)$AV€ on the cost of VLDPE (up to 50%) , using C6-LLDPE in the cling layer!Easily obtain pre-stretch levels of 250%And there is still room for improvement!
20 Enjoy the use of SABIC® LLDPE….. FinallyExplore the limits of processing traditional C4 and C6 based LLDPE resins on your extrusion linesApply fit for purpose resins in your film structuresEnjoy the use of SABIC® LLDPE…..