초록 ▼

To improve the properties of biaxially orientated blow-moulded containers of PET the mouth region of the container serving for fitting a closure member is heat-set, i.e. crystallized at elevated temperature. The heat-setting is effected at the mouth end of a parison or preform and the previously hea

To improve the properties of biaxially orientated blow-moulded containers of PET the mouth region of the container serving for fitting a closure member is heat-set, i.e. crystallized at elevated temperature. The heat-setting is effected at the mouth end of a parison or preform and the previously heat-set mouth end is then reshaped to the finished mouth portion. This improves the dimensional stability of the mouth region.

대표청구항 ▼

Method of making a blow-molded container from a thermoplastic polyester comprising the steps of forming a parison having a mouth section to be provided with a closure attachment configuration to subsequently serve for detachable fitting of a closure member; first heat setting the mouth section by he

Method of making a blow-molded container from a thermoplastic polyester comprising the steps of forming a parison having a mouth section to be provided with a closure attachment configuration to subsequently serve for detachable fitting of a closure member; first heat setting the mouth section by heating the mouth section to the crystallization temperature of the thermoplastic polyester for a period of time sufficient to effect crystallization of the mouth section; after the mouth section is heat set introducing the mouth section of the parison into a mold and forming the closure attachment configuration in the heat set mouth section; and blow molding the parison to make the container with biaxial orientation.