CONDENSATION INJECTION MOLDING METHOD FOR PRODUCING BOTTLE PREFORM OF POLYETHYLENE TEREPHTHALATE AND/OR COPOLYESTER THEREOF AND PREFORM THAT CAN BE PRODUCED BY THE METHOD

PROBLEM TO BE SOLVED: To produce a bottle preform exceptionally low in acetaldehyde content from a melt of polyethylene terephthalate and/or its copolyester while avoiding a time-consuming process stage in conventional technique. SOLUTION: In a condensation injection molding method for producing a b...

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Hauptverfasser:	BUERUNAA KEEGI, YOAHIMU ENJINGAA, BUERUNAA SHIYUTEIBARU, KURAUSU NOOTOHERUFUAA
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS COMPOSITIONS BASED THEREON GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS 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 TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To produce a bottle preform exceptionally low in acetaldehyde content from a melt of polyethylene terephthalate and/or its copolyester while avoiding a time-consuming process stage in conventional technique. SOLUTION: In a condensation injection molding method for producing a bottle preform from a melt of polyethylene terephthalate and/or its copolyester, inert gas is arbitrarily injected in a continuous or partial stream of a polyester melt with intrinsic viscosity resulting from polycondensation of 0.5-0.75 dl/g. Thereafter, a process for reducing the content of acetaldehyde of the melt after melting to below 10 ppm at 285-260 deg.C under reduced pressure in a condensation reactor is performed for a stagnation time of 60 min and, immediately thereafter, the melt is guided to an injection molding apparatus to be processed into a preform.