| abstract |
A simple, continuous process for the production of foam beads, in which the blowing agent can be circulated without problems, is characterized in that polymer particles and dispersing agent are continuously fed to a slim, pressure-operated, non-stirred mass transfer column and are subjected to a heat treatment under pressure, after which the dispersion is sprayed out into a low-pressure chamber and is expanded in the process, the polymer particles expanding.n n n Here, foam beads of constant quality are produced without complex procedural measures, which in particular have a uniform cell diameter and a uniform degree of expansion. |