国产120胶卷,经自然存放,在显影之后,发现胶片上出现纸带背层上印制的数字及符号,这一现象我们称之为“印字”。“印字”的出现使胶卷变成废品而失去使用价值,这是一个严重的质量问题。对“印字”产生的原因,曾提出不少看法:1. 因为纸带潮湿,在与乳剂面的长期接触中发生了粘联,将纸带上的数字及符号粘于乳剂面上,造成了“印字“。 Domestic 120 film, after natural storage, after the development, found on the film appear on the tape printed on the numbers and symbols, a phenomenon we call “printing.” The appearance of “printing” made the film waste and lost the use value, which is a serious quality problem. The reasons for the “print” have made a number of observations: 1 because the tape wet, long-term contact with the emulsion surface occurred in the sticky, the tape on the number and symbols stick to the emulsion surface, resulting in “Print.”