| 摘要 |
<p>1349007 Cutting glass PPG INDUSTRIES Inc 27 May 1971 [15 Sept 1970] 17376/71 Heading C1M In a method of cutting glass by providing a thermal energy source adjacent to, but spaced from a sheet of glass to apply thermal radiation along an intended line of cut, a shield is interposed between the thermal energy source and the glass to prevent some of the radiation reaching the glass and so create a more symmetrical temperature profile. It is stated that when radiation is applied to a glass sheet in the absence of the shield adjacent one end an asymmetric temperature arises about the intended line of cut due to the different patterns of reflection of either side of the said line. In practice the thermal energy source is a line or point source of infrared radiation 8 situated at one focus of an elliptical reflector 12, the reflector having a heat shield 26 mounted on the reflector to shield the trim side of the glass. The shield 26 may be made of aluminium or stainless steel and may be coated with a high temperature insulator such as aluminium-silicate fibres. The shield 26 has a curved edge 28 adjacent the line of cut. Reference has been directed by the Comptroller to Specification 1,258,136.</p> |
