| 摘要 |
Plant for blow moulding hollow plastic bodies, comprising: a plurality of preform blow-moulding dies (1); at least an acoustic/electric transducer apparatus (2) adapted to detect the sound issued outwardly by the individual blow-moulding dies (1) during the blow-moulding process, and to convert it into an electric signal, means adapted to process said electric signal and convert it into a signal capable of being compared with a reference signal, means adapted to perform such a comparison of said processed electric signal with said reference signal or level, means adapted to selectively reject sai d hollow bodies off the production line in accordance with the outcome of said comparison. Said acoustic/electric transducer apparatuses (2) are at least partially housed inside the platen or frame that is common to several dies (1), and are arranged in the vicinity of respective blow-moulding cavities.< /SDOAB>
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