Process for the continuous production of foam beads

A continuous process, using simple apparatus, for the production of foam beads, in which the blowing agent can be readily recirculated, is characterised in that polymer particles and dispersants are fed continuously to a slender, pressure-operated, non-stirred mass transfer column and in the latter...

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Bibliographische Detailangaben
Hauptverfasser:	PERL, HORST, TRAEGER, MICHAEL, LEVEN, THOMAS
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	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 INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS 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
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Beschreibung
Zusammenfassung:	A continuous process, using simple apparatus, for the production of foam beads, in which the blowing agent can be readily recirculated, is characterised in that polymer particles and dispersants are fed continuously to a slender, pressure-operated, non-stirred mass transfer column and in the latter are subjected to a heat treatment under pressure, after which the dispersion is sprayed into a low-pressure chamber and in the process is decompressed, the polymer particles expanding. In the process, foam beads are produced with constant quality without complicated process measures and have in particular a homogeneous cell diameter and a uniform degree of expansion.