Patent ID: 7832234
Filing Date: 2010-11-16
Classification: C03B

Abstract:
1. A method of forming of an article made of a transparent, semitransparent, or opaque material selected from the group consisting of glass, glass ceramic, and plastic, the method comprising: heating at least a part of said article with a radiation source; and forming said part of said article in a drawing process where a preform for said article is drawn to a smaller diameter, wherein said heating comprises radiation heating at least one section of the article having said smaller diameter with a first wavelength having a penetration depth larger than a dimension of the at least one section in the direction of the incident radiation and simultaneously irradiating at least one section of the perform with a second wavelength having a penetration depth lower than the dimension of the at least one section so that radiation having said first wavelength is guided via said article from said smaller diameter to said preform.