| 摘要 |
In a cold rolling mill an infra-red detector is situated a distance from the metal strip and, with respect to the direction of strip throughput, behind the roll gap formed between two work rolls. The detector determines local temperature differences linearly over the whole width of the strip and converts the infra-red radiation into electric signals to actuate means for regulating the roll gap. The metal strip in particular a thin strip on foil, emerging from the roll gap is deflected by at least one contact roll that serves as a tension roll and has low back-reflection capacity and high capacity for emission of infra-red radiation, then deflected by deflection roll/rolls without slipping, and the infra-red radiation from the contact roll/rolls registered along a mantle line and converted into control signals to actuate means for regulating the roll gap. At least the outer mantle of the contact roll/rolls is comprised of a material that can be ground, reflects little and has an infra-red emission capacity of at least 0.7 with reference to the infra-red emission capacity of a black body.
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