B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/531
B29C 49/48 (2006.01) B29C 49/16 (2006.01) B29C 49/28 (2006.01) B29C 49/32 (2006.01) B29C 49/04 (2006.01)
Patent
CA 1078122
ABSTRACT OF THE DISCLOSURE Plasticized parisons of synthetic thermoplastic material are formed in an extrusion machine from where they are transferred to a station to be pneumatically converted in the cavity of an open-and-shut premold into hollow blanks which are larger than the parison but smaller than the desired shaped ar- ticle. During such pneumatic conversion the material of the pa- rison may be subjected to shock-like cooling concomitantly with conversion into the blanks, by appropriate cooling of the premold. The hollow blanks are then transferred to an intermediate station where they are subjected to thermal tempering in two or more sepa- rate stages, in order to bring them to an optimum temperature con- dition for the subsequent biaxial stretching. After tempering, the tempered blanks are transferred to another station to be pneu- matically converted into respective shaped articles in the cavity of another open-and-shut mold and under biaxial stretching of their material. -1-
265135
Mehnert Gottfried
Na
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