초록 ▼

Lightweight aircraft transparencies are shaped to a desired configuration by laying up a plurality of flat oversized plastic sheets in a desired sequence to form a flat assembly. Portions of the marginal edges of the flat assembly are supported on a female support ring having a non-planar supporting

Lightweight aircraft transparencies are shaped to a desired configuration by laying up a plurality of flat oversized plastic sheets in a desired sequence to form a flat assembly. Portions of the marginal edges of the flat assembly are supported on a female support ring having a non-planar supporting surface. The assembly is first shaped at a temperature below its deformation temperature to a preliminary shape where its marginal edge portions conform to the non-planar supporting surface of the female support ring. While the marginal edges of the preliminarily shaped assembly are maintained in conformity with the female support ring, the assembly is uniformly exposed in an enclosed autoclave to elevated pressures to minimize outgassing and to elevated temperatures above its deformation temperature. A male form having an outline smaller than the female support ring engages the central portion of the preliminarily shaped assembly to impress the desired final shape thereto, e.g., a compound configuration. Thereafter, the marginal edge portions of the finally shaped and laminated assembly are trimmed away to leave the central portion of the assembly with a desired shape.

대표청구항 ▼

A method of forming a transparent laminate having a desired compound or complicated configuration, comprising the steps of: supporting a plurality of relatively flat, rigid, transparent lites and soft interlayer sheets in an overlying relation one to another to form a flat assembly, having a plurali

A method of forming a transparent laminate having a desired compound or complicated configuration, comprising the steps of: supporting a plurality of relatively flat, rigid, transparent lites and soft interlayer sheets in an overlying relation one to another to form a flat assembly, having a plurality of interfacial surfaces; removing gases from the interfacial surfaces between said overlying lites and sheets; laminating said evacuated overlying flat lites and sheets together to form an assembly having a deformation temperature; positioning marginal edge portions of the flat assembly in facing relation to portions of a supporting surface of a non-planar female skeleton ring; biasing the assembly at a first temperature below the deformation temperature of the assembly toward the supporting surface of the female skeleton ring to conform the marginal edge portions of a first major surface of the assembly to the supporting surface of the female skeleton ring to convert said flat assembly into a preliminarily shaped assembly; heating the preliminarily shaped assembly to a second temperature at least equal to the deformation temperature of the assembly; while exposing the assembly to superatmospheric pressure sufficient to prevent outgassing from the sheets; and urging a male form having a shaping surface of desired configuration toward a central portion of the second and opposite major surface of the assembly to impress the shaping surface configuration of the male form on the central portion of the assembly during said heating and elevated pressure exposing steps, thereby converting said preliminarily shaped assembly to a transparent laminate having said desired compound or complicated configuration.