Packaging: ExxonMobil’s HDPE for recyclable MDO flexible films

Teknor Apex’s Sarlink RX 3100B series TPV

US firm ExxonMobil has developed a high density polyethylene (HDPE) grade, ExxonMobil HD7165L, for machine direction oriented (MDO) PE film applications. Designed for recyclability, HD7165L can help converters create mono-material laminates to replace multi-material laminate structures which can be difficult to mechanically recycle.

Features like optical and mechanical properties, make the grade well suited to help enable mono-material laminated packaging that can be used to package products like nuts, crackers, condiments, granola bars, and potato chips.

“The development of new HD7165L has been driven by market demand from brand owners and processors looking to develop all-PE packaging which, in turn, has created a need for print webs made of blown MDO-PE films,” said Nilesh Savargaonkar Principal Customer and Application Development Engineer, ExxonMobil.

ExxonMobil HD7165L can help enable converters to produce blown MDO-PE films with 60-70% HDPE for enhanced stiffness and high heat resistance.

High output rates in excess of 400 kg/hour are possible, while bubble stability is maintained, adds the US materials firm. High MDO stretch ratios as high as 7:1, with very high stiffness (1% secant modulus as high as >200 kpsi) can be achieved. With haze less than 10% and gloss higher than 60%, the HD7165L grade offers excellent optical properties. Used as a print web of a PE-PE laminate, HD7165L offers high heat resistance, stiffness for a lack of extensibility, and excellent printability for optimum brand promotion.

In blown MDO-PE film applications, it offers high, uniform orientation, gauge stability, and low gels for easy processability.

Compared to a market reference HDPE grade (density 0.962 g/cm³), the HD7165L grade (density 0.961 g/ cm³) delivers better shear thinning behaviour and extrudability, higher melt strength for bubble stability, excellent orientability, and gauge uniformity, says the firm.

The company says it is on an ongoing innovation to develop new PE grades that can help enable the creation of mono-material packaging structures.


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