Parison is pressed in an initial mold, especially of an IS press-blow glass molding machine, using an internal punch for complete shaping of an axial outer sealing edge of the parison mouth

摘要

Parison pressing in an initial mold (1) of a press-blow glass molding machine, using an internal punch (10) for complete shaping of an axial outer sealing edge of the parison mouth, is new. A pressed parison is produced in an initial mold (1) of a press-blow glass molding machine by (a) introducing a gob from an overhead feeder through a charging opening (26) into the initial mold cavity (17), the initial mold (1) having a mouth mold with a closed longitudinally split mouth tool (2) for shaping the parison mouth; (b) pressing a punch (10) into the gob through a central passage (42) of the mouth mold until it attains a working end position in the mouth mold, the parison being pre-pressed to cause partial filling of the cavity (17) with molten glass; (c) applying pressure, during or at the end of step (b), onto the base (66) of the parison using a pressing element (44), which delimits part of the cavity (17), until the cavity (17) is completely filled with molten glass and the parison is finish pressed; and (d) retracting the pressing element (44) and all components of the initial mold, except the closed mouth tool (2), so that the closed mouth tool (2), holding the parison mouth, and the parison can be transferred into a finish molding station of the glass molding machine, and retracting the punch (10) from the parison into a transfer end position. In step (b), the punch (10) is moved into its working end position until it seats on the mouth tool (2) and an axial outer sealing edge of the parison mouth is fully shaped by the punch (10). An Independent claim is also included for an apparatus for carrying out the above process.