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Control of thermoplastic polymer crystallization by moisture level control useful for controlling the crystallization of polyesters, e.g. polyethylene terephthalate, polyethylene napthalate, or polybutyene terephthalate
Control of thermoplastic polymer crystallization by moisture level control useful for controlling the crystallization of polyesters, e.g. polyethylene terephthalate, polyethylene napthalate, or polybutyene terephthalate
A process for crystallization of at least partially amorphous thermoplastic polymer material obtained from a polymer melt, in which before crystallization the polymer material is subjected to one or more conditioning steps, in which a controlled moisture level and/or a controlled moisture profile is set up in the material. During crystallization of partially amorphous thermoplastic polymers, in spite of careful temperature control agglomerate formation via pellet formation and/or formation of pellets with their breaking open on the crystallizer walls can occur when the conditions of granulate formation are unsuitable and/or because of unsuitable bedding of the granulate prior to crystallization, and this can be hindered by controlling the moisture content. A process for crystallization of at least partially amorphous thermoplastic polymer material obtained from a polymer melt, in which before crystallization the polymer material is subjected to one or more conditioning steps, in which a controlled moisture level and/or a controlled moisture profile is set up in the material.
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