DEVICE FOR SEALING A PLASTIC CONTAINER PREFORM TO A BLOW MOULDING NOZZLE, AND CONTAINER BLOW MOULDING MACHINE PROVIDED THEREWITH
A machine for blow moulding or stretch-blow moulding a preform (5) in a mould (6), wherein a seal (20) is provided between the preform (5) and the blow moulding nozzle (1). Said seal is mounted on the nozzle (1) and can be placed in two positions, i.e. a first position in which it is prevented from contacting the preform during the insertion of the nozzle into the preform, and a second position in which it forms the seal therebetween. Members (18, 21, 26, 27) are provided for moving the seal from the first to the second positions once the nozzle has been fully positioned within the preform. A machine provided with such a device for producing containers by blow moulding or stretch-blow moulding a preform (5) is also disclosed.