FIELD: manufacturing technology.
SUBSTANCE: invention relates to methods and systems of blow molding with extrusion of polyethylene terephthalate (PET). Extruded PET-preform contains the first extruded polymer containing PET, and the second extruded polymer with characteristic viscosity 0.8–0.87 containing PET. First extruded polymer and the second extruded polymer are extruded together. First extruded polymer has characteristic viscosity higher than characteristic viscosity of the second polymer. Besides, extruded monolayer PET-preform for container blow moulding with extrusion. Extruded multilayer polymer is in hardened condition and has characteristic viscosity from 0.96 to 1.4 and stripped chain extenders.
EFFECT: production of a product with no haze and/or banding, having high strength.
15 cl, 4 dwg
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