AUXILIARY DEVICE, AND METHOD FOR FINISHING PREFORMS

摘要

The invention relates to an auxiliary device and a method for finishing andcalibrating preforms (10) that are removed from a multiple tool in an unstableshape, the calibration process being performed with the aid of compressed airimmediately after removing and withdrawing the preforms (10) from themultiple tool. Nipples that can be inserted into the preforms (30) areprovidedwith expandable press rings or sealing rings (56) in order to seal theinterior ofthe blow-molded part of the preforms (10). The compressed air is introducedvia the nipples (30), the sealing process being performed by radiallyexpanding the press rings or sealing rings (56) in analogy to the closingprocess of thermoses, thus protecting the preforms (10) from adverse forces.The sealing point can be randomly selected in the transition zone from thethreaded part to the blow-molded part of the preforms (10). The inventionallows the interior of the blow-molded part (43) to be optimally sealedwithoutaffecting the form stability and dimensional stability of the preforms (10).Inspecial types of preforms, the areas that are not supported in the coolingsleeves can be preconsolidated on the outside by means of cool air from themoment the preforms are transferred to the removal sleeves or coolingsleeves.