Injection-compression molding device

An injection-compression molding device for producing bottle preforms, comprising:

• a frame;
• at least one molding cavity fixed to the frame;
• at least one rod, connected to the frame so as to be capable of sliding with respect thereto;
• at least one core, connected to the at least one rod so as to be capable of sliding therewith, adapted to be inserted into the at least one molding cavity defining a mold;
• actuation means adapted to exert a mold closing force when the at least one core is inserted into the at least one molding cavity;
• a joint connecting the at least one core to the at least one rod, wherein said joint comprises
• a first part integrally connected and coaxial to said at least one core and defining a joint cavity;
• a second part integrally connected and coaxial to said at least one rod and at least partially slidable within said joint cavity when the mold closing force is applied;
• elastic means arranged in said joint cavity between the first and second parts and configured to enable movement of the second part with respect to the first part;
• said first part being provided with an inner side surface;
• said second part being provided with an outer side surface;
• wherein, in a first configuration of the joint without the mold closing force being exerted, the outer side surface is kept in contact with the inner side surface by the bias of said elastic means, such that the at least one rod and the at least one core are kept coaxial with respect to each other;
• and wherein in a second configuration of the joint with the mold closing force being exerted, said second part is translated with respect to the first part so that said elastic means is pressed by the second part so that a clearance is provided between the outer side surface and the inner side surface, such that the at least one rod can tilt to a non-coaxial position with respect to the at least one core.