A process for producing polyolefin foam particles having a high bulk density

The invention relates to a process for producing polyolefin foam particles having a bulk density of 200 to 400 g / l, wherein the particulate, expandable olefin polymers containing from 0.5 to 10 wt .-% of a volatile organic blowing agent, and a bulk density of more comprise than 400 g / l, are foamed to the desired bulk density.