Glass manufacturing – Processes – Reshaping or surface deformation of glass preform
Patent
1977-05-02
1978-08-08
Kellogg, Arthur D.
Glass manufacturing
Processes
Reshaping or surface deformation of glass preform
65273, 65287, C03B 2302
Patent
active
041054296
ABSTRACT:
A process and apparatus for holding and forming a sheet of thermo-plastic material particularly optical or mirror grade glass to a precise dimension with contact only on one face thereof and capable of applying forming stress uniformly to the plastic body with a minimum of contact with the faces of the blank. The device which may be inserted into a tunnel oven or the like includes a female cavity conforming to the precise shape to which the thermo-plastic material is to be formed. The female cavity is positioned at an angle with respect to the vertical and includes an edge lip on the lower extremity against which a flat blank of material to be formed may rest over the cavity. A generally planar mold cover includes an edge hook which engages the opposite or upper edge of the blank. The entire assembly is inserted into an oven and the oven elevated to the softening temperature of the plastic blank. The edge force applied to the blank due to the weight of the mold cover causes the upper edge to move downward as the blank sags. The edge-only forming force is transmitted throughout the blank to bring its lower surface into precise engagement with the female mold below.
Kellogg Arthur D.
Wagner John E.
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