CIRCUIT AND PROCESS FOR MANAGING TRANSIENTS IN A PLANT FOR CONTINUOUS MASS PRODUCTION OF GRANULATED EXPANDABLE POLYMERS

• Main Authors: INGLESE RICCARDO, FELISARI RICCARDO, GAVIOLI SARA
• Format: Patent
• Language: Chinese; English
• Published: 07.08.2020
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MAKING GRANULES OR PREFORMS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

A circuit and a process for managing transients and process and product anomalies in a plant for production of granulated expandable polymers EPS or extruded polymers XPS are disclosed, said circuit being placed e.g. in a granulation plant along which are positioned: a mixing device (35) suitable for mixing additives and expanding agent within a stream of molten polymer, a granulator (39) or an extrusion device positioned downstream of said mixing device, a deviation valve (38) suitable for molten polymers placed along the line connecting said mixing device to said granulator or to said extrusion device upstream of said granulator or extruder, said deviation valve being provided with at least one inlet (A), a stand-by position (A->C) and a run position (A->B), said circuit further comprising a heating device (11) downstream of said valve, a separation device (13) downstream of said heating device suitable for physically separating the blowing agent from the polymer and any additives present therein, and a coo