Bottled water consumption is growing rapidly in Asia and simultaneously, there are pressures from brand owners on sustainability and packaging cost. One avenue available to assist in these dual aims is to adopt one-piece short-neck closures.
Targeting this opportunity, Borouge (Singapore) recently developed two high stress crack resistance HDPE grades for caps and closures. "These grades may make their mark in particular in Southeast Asia and China, where summer temperature are high," notes Wim Roels, CEO of Borouge. "They would enable the use of short-neck closures in carbonated beverage packaging."
"The HDPE material also enables design of a one-piece cap as it is flexible enough to ensure a good seal. PP caps, conversely, require use of an elastomeric seal in a two-piece design," adds Roels. Short-neck caps also present challenges in ensuring that they are easy to open even for children and the aged. "You need a low enough torque for opening, as well as that reassuring opening sound," explains Roels.