Borealis says its new BorPure multimodal HDPE grades will create opportunities for the beverage industry to develop screw caps with “best-in-class organoleptic performance” for bottled water and soft drinks. BorPure is claimed to assure an ‘as bottled’ taste “without compromising on cap quality, aesthetics or converters’ demands for higher productivity with manufacturing cost reductions”.
To be launched at Plast ’09 in Milan (March 24-29), the grades are: BorPure MB6561 designed for still and sparkling water and carbonated soft drinks, MB6562 for carbonated soft drinks, and MB7541 for still water.
Borealis also offers a BorPure PP grade with organoleptic properties for the bottled water, sports and energy drinks market. BorPure RE450MO is said to retain its natural taste of the liquid inside “while delivering design possibilities not previously available with existing PE or PP caps”.
The multimodal PE grades have a higher flow than unimodal at similar melt flow rate that is said to improve processing ease significantly and allow converters to lessen holding pressure during injection or compression moulding.
This creates a more economical process of faster production lowering both energy consumption and maintenance requirements. The lower holding pressure leads to reduced internal stress that in turn creates a higher level of environmental stress cracking resistance for the finished caps.
In addition, the multimodal BorPure grades are said to offer good low temperature impact strength, an excellent stiffness/impact balance and improved surface aesthetics.
