利用国产镀铬铁为覆膜铁基板生产的二片罐,由于制耳现象严重,基板的利用率较低。对国产基板的平面异性系数Δr值的测算结果表明:Δr值远小于零,其制耳方向与轧制方向呈45°,与实际制耳结果吻合良好。采用国外优质镀铬铁板材制罐的结果表明,由于Δr值趋于零,无明显制耳现象出现。 The use of domestic chrome-plated iron coated iron substrate production of two cans, due to severe ear phenomenon, the substrate utilization is low. The calculation of the Δr value of the flat substrate made from the substrate showed that the value of Δr was far less than zero and the direction of the ear-making was 45 ° with the rolling direction, which was in good agreement with the actual ear-making result. The results of using high quality ferrochrome plate made in foreign countries show that there is no obvious ear phenomenon due to the fact that the value of Δr tends to zero.