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AssigneeEmhart Industries, Inc.
InventorsThomas V. Foster, Stanley P. Jones, David L. Alderson
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A method and plunger arrangement for forming parisons in the manufacture of hollow articles of glassware. The method comprising forming each parison by introducing a gob of molten glass into a mould cavity (10) having the shape desired for the external surface of the parison, and moving a plunger (14,70) into the mould cavity to cause the molten glass to conform to the shape of the cavity. The method also comprises forming a layer of gas (G.98) between a surface portion of the plunger and the molten glass so that, as the plunger moves into the cavity, the glass is pushed into shape by the layer of gas, and rotating or vibrating the plunger while it is in the mould cavity. The plunger arrangement provides means for carrying out the method.
A method of forming parisons in the manufacture of hollow articles of glassware, the method comprising forming each parison by introducing a gob of molten glass into a mould cavity having the shape desired for the external surface of the parison, and moving a plunger into the mould cavity to cause the molten glass to conform to the shape of the cavity, wherein the method also comprises forming a layer of gas between a surface portion of the plunger and the molten glass so that, as the plunger moves into the cavity, the glass is pushed into shape by the layer of gas, and rotating the plunger while it is in the mould cavity about a longitudinal axis thereof.
A plunger arrangement for use in forming parisons in the manufacture of hollow articles of glassware, the arrangement comprising a plunger, moving means for moving the plunger into a mould cavity, forming means for forming a layer of gas between a surface portion of the plunger and molten glass in the mould cavity, and means for rotating the plunger while it is in the mould cavity about a longitudinal axis thereof.
Dependencies are inferred from the claim text.