| 摘要 |
<p>1493126 Scoring glass PPG INDUSTRIES Inc 19 Nov 1974 [20 Nov 1973] 49951/74 Heading ClM Glass is scored by a method which involves the production of a "pseudosubsurface score", that is a score which is wholly below the surface of the glass but is connected therewith by a zone of damaged glass. Such a score is produced using a cutting wheel having a cutting angle in the range 150 to 180 degrees and a diameter of at least 12 millimeters, a scoring force of at least 30 kilograms and a cutting speed not greater than 50 kilometres a second.</p> |
