Method of forming glass bottles
AssigneesRuth B. Northup, John D. Northup, Jr., Nancy Northup Lehrkind, Mary E. Northup
InventorJohn D. Northup
Life of this patent
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Abstract
A method of forming glass bottles from a short parison is disclosed, which method includes the steps of mechanically elongating the parison in a blow mold to an extent that the exterior bottom of the elongated parison is near, but not at, the bottom of the blow mold cavity and subsequently expanding the elongated parison by vacuum on its exterior and/or by air pressure on its interior, and finally removing the blown bottle from the blow mold.
Claims12
A method of forming a glass bottle which includes:
- introducing into a blow mold a parison having a central bubble therein, which parison has a height less than 75% of the height of the blow mold cavity;
- engaging a bottom of the parison with a gripping mechanism;
- mechanically stretching the parison to a position close to, but not at, the lower surface of the mold cavity by moving the gripping mechanism;
- releasing the gripping mechanism from contact with the parison to allow the parison bottom to reheat;
- expanding the parison to the configuration of the blow mold;
- and
- removing the blown bottle from the blow mold.
A method of forming a glass bottle which includes:
- introducing into a blow mold a parison having a central bubble therein, which parison has a height less than 75% of the height of the blow mold cavity;
- engaging a bottom of the parison with a gripping mechanism;
- mechanically stretching the parison to a position close to, but not at, the lower surface of the blow mold cavity by moving the gripping mechanism and simultaneously partially expanding the parison;
- releasing the gripping mechanism from contact with the parison to allow the parison bottom to reheat;
- expanding the parison to the configuration of the blow mold;
- and
- removing the blown bottle from the blow mold.
A method of forming a glass bottle which includes:
- introducing into a blow mold a parison having a central bubble therein, which parison has a height less than 75% of the height of the blow mold cavity;
- engaging a bottom of the parison with a gripping mechanism;
- mechanically stretching the parison to a position close to, but not at, the lower surface of the mold cavity by moving the gripping mechanism;
- partially expanding the parison;
- releasing the gripping mechanism from contact with the parison to allow the parison bottom to reheat;
- expanding the parison to the configuration of the blow mold;
- and
- finally removing the blown bottle from the blow mold.
A method of forming a glass bottle by the press and blow process which includes:
- introducing into a blow mold a parison having a pressed central bubble therein, which parison has a height less than 75% of the height of the blow mold cavity;
- engaging a bottom of the parison with a gripping mechanism;
- mechanically stretching the parison to a position close to, but not at, the lower surface of the mold cavity by moving the gripping mechanism;
- introducing air into the parison bubble to partially expand the parison to an intermediate shape;
- releasing the gripping mechanism from contact with the parison to allow the parison bottom to reheat;
- expanding the parison to the configuration of the blow mold;
- and
- removing the blown bottle from the blow mold.
A method of forming a glass bottle by the press and blow process which includes:
- introducing into a blow mold a parison having a pressed central bubble therein, which parison has a height less than 75% of the height of the blow mold cavity;
- engaging a bottom of the parison with a gripping mechanism;
- mechanically stretching the parison to a position close to, but not at, the lower surface of the mold cavity by moving the gripping mechanism;
- simultaneously introducing air into the parison bubble to partially expand the parison to an intermediate shape;
- releasing the gripping mechanism from contact with the parison to allow the parison bottom to reheat;
- expanding the parison to the configuration of the blow mold;
- and
- removing the blown bottle from the blow mold.
Dependencies are inferred from the claim text.