Patent ID: 8801982
Filing Date: 2014-08-12
Classification: B29B,B29C,B29K,B29L,C08J

Abstract:
1. A method for production of expandable vinyl aromatic polymer pellets comprising: during start-up of the production of the expandable vinyl aromatic polymer pellets: when the polymer flow rate is in the operating range of the pelletizer (S), switching the introduction of the vinyl aromatic polymer, the expandable agent, and optionally the additives from the pelletizer (L) to the pelletizer (S), and operating the pelletizer (S) at conditions effective to produce the expandable vinyl aromatic polymer pellets, wherein the pelletizer (S) comprises a second die plate having a plurality of holes of small diameter and a second cutting means; recovering the expandable vinyl aromatic polymer pellets from the pelletizer (S); recovering the pellets from the pelletizer (L); and recycling the pellets produced by the pelletizer (L), wherein the recycling of the pellets produced by the pelletizer (L) comprises: