METHOD AND DEVICE FOR MAINTAINING AN INNER DIAMETER OF A PLASTIC CONTAINER
Methods and devices for manufacturing plastic preforms and plastic containers are provided. Methods of manufacturing a plastic preform having an inner undercut include forming a preform of plastic in amorphous state and inserting a plug within the mouth of the preform. The plug includes an upper plu...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | Methods and devices for manufacturing plastic preforms and plastic containers are provided. Methods of manufacturing a plastic preform having an inner undercut include forming a preform of plastic in amorphous state and inserting a plug within the mouth of the preform. The plug includes an upper plug member and an expandable element, the expandable element having an initial outer diameter in plan view with the plug in an initial condition and a deployed outer diameter in plan view with the plug in a deployed condition. Methods further include deploying the plug to the deployed condition with the expandable element positioned to engage a side wall proximate the inner undercut and crystallizing the plastic of the preform along the finish portion. |
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