Method of manufacture of glass flasks with stem and apparatus for performing of this method
AssigneeOlivotto Glass Technologies S.p.A.
InventorJán Granzer
Life of this patent
Estimating the term…
Abstract
The cake (7), fitted with the rough pressing (71) of the stem parison (61) is situated on the ring (8) where by the action of its own gravity, it streams off till the rough pressing (71) fits into the cavity (41) of the bottom mould (4). There the rough pressing (71) is fastened by the underpressure and the air is blasted into the flask (6) and, in the same time, the bottom mould (4) is forced downwards. When the orifice (42) of the cavity (41) comes on the level of the surface (51) of the bottom opening of the glass-blowing mould (5), the glass-blowing mould (5) is closed and the air is blasted into the flask (6) until it obtains the shape of the inner wall (52) of the glass-blowing mould (5).
Claims6
A method of manufacture of a glass vessel, the glass vessel comprising a flask (6) and an integrated stem, comprising the steps of:
- introducing a dose of molten glass into a parison mould (1), in which a cake (7) is formed having a rough pressing (71) of a stem parison (61) projecting from its bottom,
- placing the cake (7) on a rotating ring (8) arranged above a glass-blowing mould (5) having a vertically movable bottom mould (4), the rotating ring (8) arranged to rotate in a given direction around an axis of rotation, the movable bottom mould having a cavity (41) and arranged to rotate in the same direction as the rotating ring (8), the axis of rotation of the rotating ring (8) laying in straight line with a longitudinal axis of the glass-blowing mould (5),
- clamping a periphery of the cake (7) against the rotating ring (8) by a holder (10) of a blowing apparatus (9), wherein the cake (7) streams off spontaneously by gravity through the rotating ring (8) and changes shape into a shape of the flask (6),
- shifting out the bottom mould (4) into an area of the glass-blowing mould (5), in an open configuration, close under the rotating ring (8), the rough pressing (71) fitting into the cavity (41) of the bottom mould (4),
- fastening the rough pressing (71) in the cavity (41) of the bottom mould (4) by underpressure,
- blasting air into the flask (6) by said blowing apparatus (9) and, at the same time, forcing the bottom mould (4) downwards until an orifice (42) of the cavity (41) of the bottom mould (4) reaches a level of an inner rotary surface (51) of a bottom opening of the glass-blowing mould (5),
- closing the glass-blowing mould (5) and blasting air into the flask (6) until the flask (6) takes the form of an inner wall (52) of the glass-blowing mould (5),
- cooling down the flask in the glass-blowing mould (5) into a solid state and, simultaneously, by action of both gravity and underpressure, finishing a final shape of the stem parison (61) to form the integrated stem in the cavity (41) of the bottom mould (4) integrated with the flask (6), which stem is subsequently cooled down into a solid state,
- releasing the underpressure in the cavity (41) of the bottom mould (4) and shifting the bottom mould (4) downwards, and
- opening the glass-blowing mould (5) and therefore releasing the flask (6) with the integrated stem.
Dependencies are inferred from the claim text.