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当你读着内容丰富多彩的报刊书籍时,一定会想到铅字,把纸变成书报,离开铅字是不行的。在印刷厂里,工人们先要用铅字排成版,用它在湿纸板上打出纸型,化好的铅水浇到纸型上,得到印书报用的铅版。不过,铅和其他很多物体一样,也有热胀冷缩的性质。如果光用铅铸铅版,那是不行的。这是因为纸型上的凹槽必须很窄小,印出的字迹才会又细又清楚,当熔好的铅液倒进纸型时,
When you read the colorful newspapers and periodicals, you must think of the typeface, turn it into a newspaper, and leave the typeface is not acceptable. In the printing plant, workers first use typesetting to form a plate. Using it, a paper type is printed on a wet paperboard. A good amount of lead water is poured onto the paper type to obtain a lead version for printing. However, lead, like many other objects, also has the properties of thermal expansion and contraction. If the light cast lead lead version, it is not acceptable. This is because the paper on the groove must be very narrow, the printed handwriting will be fine and clear, when the molten lead into the paper,