Presentation on theme: "SABIC Polyethylenes BV Stretching the Limits Marcel van Enckevort SABIC Polyethylenes BV The effect of Extrusion and Casting process variables on Stretch."— Presentation transcript:
SABIC Polyethylenes BV Stretching the Limits Marcel van Enckevort SABIC Polyethylenes BV The effect of Extrusion and Casting process variables on Stretch Film Performance
SABIC Polyethylenes BV 2 Introduction Stretching the... As a converter you can improve your economies of scale by stretching the output and speed to the limits of your cast stretch lines.Limits Equipment Application Resins
SABIC Polyethylenes BV 6 Facts & Figures Almost 90% of the stretch film demand is in hand wrap and machine wrap applications Maximum pre-stretch level up to 250% More than 80% of your film cost price is determined by the resins End users are looking for the lowest price!
SABIC Polyethylenes BV 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 properties Did you optimise line settings to use the full potential of the resins? Are you using fit for purpose resins?
SABIC Polyethylenes BV 8 Approach Butene-based SABIC ® LLDPE 318B (2.8/918) A state-of-art cast stretch film line Real world conditions 3-layer film concept A/B/C with 15% VLDPE in cling layer and 25% trim recycle in the core Experimental design 15 experiments in 2 days Easy adjustable variables
SABIC Polyethylenes BV 9 Cast2020: Settings DimensionValue Output> 1000 kg/h Winding speed500 m/min Die gap0.6 mm Film thickness20 µm Layer distribution15/70/15 % Recycle in core layer25% Photo: SMS Folientechnik GmbH
SABIC Polyethylenes BV 10 Cast2020: Settings – Cont. VariableRange Melt Temp.250 – 290 °C Chill roll Temp.15 – 25 °C Vacuum box2 – 4 cm H 2 O Photo: SMS Folientechnik GmbH
SABIC Polyethylenes BV 11 SABIC ® C 4 -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) Cling Elastic recovery (snap back) Stress retention (bundling force)
SABIC Polyethylenes BV 14 Real world testing – Cont. Looking for the limits we found several holes and film ruptures! we also found consistent pre-stretch levels up to 400 % BUT(ENE)
SABIC Polyethylenes BV 15 Conclusions Apply optimal processing conditions to utilise the potential performance present in your C 4 -LLDPE based films Take advantage of the cost price benefits from maximising the use of C 4 -LLDPE Achieve pre-stretch levels up to 400%!!
SABIC Polyethylenes BV 17 What about the SABIC ® C 6 -LLDPE? compared SABIC ® C 6 -LLDPE (and C 4 -LLDPE) with metallocene based-C 6 -LLDPE and with C 8 -LLDPE Cast2020 cast film line 3-layer film concept A/B/C concept with 15% VLLDPE in cling layer and 25% recycle in the core Melt temperature, chill-roll and vacuum box on midpoint settings
SABIC Polyethylenes BV 19 Conclusions Utilising C 6 -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!
SABIC Polyethylenes BV 20 Finally Explore the limits of processing traditional C 4 and C 6 based LLDPE resins on your extrusion lines Apply fit for purpose resins in your film structures Enjoy the use of SABIC ® LLDPE…..