Mold for forming glassware
AssigneeDeloro Stellite Company, Inc.
InventorsPeter Neuman, James B. C. Wu, Gunther Clos
Life of this patent
Estimating the term…
Abstract
A mold having a pair of mold halves defining a mold cavity for forming a glass container. There is an inner shell of the mold and an outer shell and a gap therebetween through which cooling gas flows. Heat transfer elements on the inner shell extend laterally outwardly from the inner shell into the gap for contact by cooling gas flowing through the gap thereby to cool the inner shell. The inner shell is formed from a hard material having a working temperature substantially greater than the melting temperature of glass, a heat conductivity of less than about 15 W/m-deg K, and a capability of generating at temperatures in excess of about 500.degree. C. a protective oxide film strongly adhered to the inner shell surface.
Claims17
A mold for forming glassware, comprising
- a pair of mold halves movable relative to one another from an open position to a closed position in which the mold halves mate with one another to define a mold cavity for molding an article of glass, said mold cavity having a vertical axis,
- each mold half comprising an inner shell part and an outer shell part, the inner shell parts of the two mold halves being constructed and arranged to mate when the mold halves are in the closed position to define an inner shell having an inner molding surface defining said mold cavity, and the outer shell parts of the two mold halves being constructed and arranged to mate when the mold halves are in the closed position to form an outer shell spaced laterally outward from the inner shell to define a gap therebetween,
- one or more inlets for the flow of cooling gas into the gap,
- one or more outlets for the flow of cooling gas out of the gap, and
- heat transfer elements on the inner shell extending laterally outwardly from the inner shell into the gap for contact by cooling gas flowing through the gap thereby to cool the inner shell,
- the inner shell being formed from a hard material having a melting temperature substantially greater than the working temperature of glass, a heat conductivity of less than about 15 W/m-deg K, and a capability of generating at temperatures in excess of about 500.degree. C. a protective oxide film strongly adhered to the inner molding surface.
A mold for forming glassware, comprising
- a pair of mold halves movable relative to one another from an open position to a closed position in which the mold halves mate with one another to define a mold cavity for molding an article of glass, said mold cavity having a vertical axis,
- each mold half comprising an inner shell part and an outer shell part, the inner shell parts of the two mold halves being constructed and arranged to mate when the mold halves are in the closed position to define an inner shell having an inner molding surface defining said mold cavity, and the outer shell parts of the two mold halves being contructed and arranged to mate when the mold halves are in the closed position to form an outer shell spaced laterally outward from the inner shell to define a gap therebeween,
- one or more inlets for the flow of cooling gas into the gap,
- one or more outlets for the flow of cooling gas out of the gap,
- heat transfer elements on the inner shell extending laterally outwardly from the inner shell into the gap for contact by cooling gas flowing through the gap thereby to cool the inner shell,
- the inner shell being formed from a hard material having a melting temperature substantially greater than the working temperature of glass, a chromium content in the range of about 16 to about 33% by weight, a heat conductivity of less than about 15 W/m-deg K, and a capability of generating at temperatures in excess of about 500.degree. C. a protective oxide film strongly adhered to the inner shell surface, and
- the inner shell having an average cross-sectional thickness in the range of between about 10 mm and about 15 mm.
Dependencies are inferred from the claim text.