| 摘要 |
<p>A composite sheet including a first polymer layer (16,46) laminated to the first major surface of a ferromagnetic substrate (12,40) having opposing first and second major surfaces. A second polymer (14,44) layer may be laminated to the second major surface of the substrate, sandwiching the substrate between the first and second polymer layers. The substrate is preferably steel having a thickness of 1 to 3 mils. First and second paper layers (48,50) may be respectively laminated to the first and second polymer layers.</p> |
