Low-temperature glass container blowing process
AssigneeOwens-Brockway Glass Container Inc.
InventorsScott Cooper, Andrew Ciaschi, Brian Coburn, William Pinc
Life of this patent
Estimating the term…
Abstract
A method of forming a glass container includes providing a glass parison having a tubular wall that includes an inside surface, which defines an interior parison cavity open at one axial end of the tubular wall, and an outside surface. The tubular wall includes an expandable blow portion that has a forming viscosity between 107.5 Pa·s and 105.5 Pa·s and is also in an isoviscous state. The glass parison is blow molded into a glass container by introducing a compressed gas into the interior parison cavity to thereby cause the expandable blow portion of the tubular wall to expand outwardly into a portion of a wall that defines the glass container.
Claims20
A method of forming a glass container, the method comprising:
- providing a glass parison having a tubular wall that includes an inside surface, which defines an interior parison cavity open at one axial end of the tubular wall, and an outside surface, the tubular wall comprising an expandable blow portion having a forming viscosity between 107.5 Pa·s and 105.5 Pa·s and also being in an isoviscous state in which any temperature gradients within the expandable blow portion of the tubular wall of the glass parison translate into a maximum viscosity difference of 102 Pa·s or less;
- and
- blow molding the glass parison into a glass container by introducing a compressed gas into the interior parison cavity while the expandable blow portion of the tubular wall has the forming viscosity and is in the isoviscous state to thereby cause the expandable blow portion of the tubular wall to expand outwardly into a portion of a wall that defines a glass container.
A method of forming a glass container, the method comprising:
- melting a glass feedstock to produce molten soda-lime-silica glass;
- delivering a gob of soda-lime-silica glass to a mold cavity of a blank mold;
- shaping the gob of soda-lime-silica glass into a glass parison in the mold cavity of the blank mold, the glass parison having a tubular wall that includes an inside surface, which defines an interior parison cavity open at one axial end of the tubular wall, and an outside surface, the tubular wall of the glass parison further comprising an expandable blow portion;
- bringing the expandable blow portion of the glass parison to a forming viscosity between 107.5 Pa·s and 105.5 Pa·s and also to an isoviscous state in which any temperature gradients within the expandable blow portion of the tubular wall of the glass parison translate into a maximum viscosity difference of 102 Pa·s or less;
- and
- blow molding the glass parison into a glass container by introducing a compressed gas into the interior parison cavity to thereby cause the expandable blow portion of the tubular wall to expand outwardly against an internal mold surface of a mold cavity of a blow mold.
A method of forming a glass container, the method comprising:
- loading a glass parison into a blow mold that defines a mold cavity, the glass parison having a tubular wall that includes an inside surface, which defines an interior parison cavity open at one axial end of the tubular wall, and an outside surface, the tubular wall comprising an expandable blow portion having a forming viscosity between 107.5 Pa·s and 105.5 Pa·s and also being in an isoviscous state in which any temperature gradients within the expandable blow portion of the tubular wall of the glass parison translate into a maximum viscosity difference of 102 Pa·s or less;
- and
- introducing a compressed gas into the interior parison cavity of the tubular wall of the glass parison to outwardly expand the expandable blow portion of the tubular wall, thereby forming a glass container from the glass parison, the glass container comprising a wall that provides a main body and a finish rim that extends axially from the main body, wherein a thickness of the wall of the glass container in the main body is less than a thickness of the tubular wall of the glass parison.
Dependencies are inferred from the claim text.