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Blast proof curtain in development

A new type of blast-proof curtain that gets thicker rather than thinner when stretched is being developed to protect potential terrorist targets, a university said today.

The new curtain - an Engineering and Physical Sciences Research Council (EPSRC) project - remains intact and captures debris such as flying glass when windows are blown in.

The project - led by the University of Exeter and its spin-off company Auxetix - is primarily designed to be fixed over the windows of potential terrorist targets, such as government and high-profile commercial properties.

University of Exeter professor Ken Evans, who is leading the project, said: “In the 1995 Oklahoma City bombing, glass accounted for nearly two-thirds of all eye and head injuries.

“The blast curtain we’re working on, which will be capable of dispersing the shock from an explosion extremely effectively, will be backed up by robust scientific understanding vital to ensuring it really can block flying debris and achieve widespread use.”

Potential uses could also include protecting people in buildings from the effects of severe weather events such as typhoons and hurricanes, the university said.

The new curtain aims to remove the need for anti-shatter films by using stronger, more resilient fibres woven into a carefully controlled textile structure.

The secret lies in the yarn the curtain is made from, the university said.

A stretchy fibre provides the core of the yarn and a stiffer fibre is then wound around it.

When the stiffer fibre is put under strain, it straightens, causing the stretchy fibre to bulge out sideways - increasing the yarn’s diameter.

As well as thickening, small pores open up in the fibres when they are stretched. These pores are designed to let through some of an explosion’s shock wave, ensuring it doesn’t rip.

Testing at a government-approved facility has already started, and after rigorous certification procedures, the new curtain could be on the market within three to five years.

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