Back to results
US 4,285,745 AGranted
Method of determining optical quality of a laminated article
AssigneePPG Industries, Inc.
InventorAloysius W. Farabaugh
Life of this patent
Estimating the term…
Abstract
An interlayer material is scanned prior to laminating same with glass sheets to generate a thickness variation signal, a wedge angle signal and an optical power signal. The signals are then selectively filtered to determine the thickness variation, wedge angle and optical power of the interlayer after lamination.
Claims10
In a method of making a transparent laminate, wherein the method includes the step of laminating at least one sheet to a plastic sheet, wherein the improvement comprises the steps of:
- generating an optical profile of the plastic sheet prior to the lamination step;
- altering portions of the optical profile of the plastic sheet to be affected by the laminating step to provide an altered optical profile which is the expected optical contribution of the plastic sheet to the laminate;
- and
- practicing the laminating step using a plastic sheet determined to have an acceptable altered optical profile.
1 more element
Dependencies are inferred from the claim text.