276泥模、铜活字、纸型、铅型到成书(1 / 2)
华夏帝国从山东开始
农民在飞
0 字
2021-07-25
排版时,一些常用字需要的数量还是相当多的,像“之”、“也”、“于”之类的常用字,几乎每句话里面都会出现,铜活字需要上百个才能保证足够作用。泥模是一次性的消耗品,每个泥模只能使用一次,好在木模可以反复使用,一个木模通过反复翻制就可以得到多个泥模,这极大地减少了雕刻木字模的工作量,也让两位雕版匠有时间将每个字模都刻制到比较完美的程度。
彻底干燥后的泥字模放在特制的铁制铸字模具里面,关闭模具之后便可以浇入融化的铜水进行浇铸,冷却之后便能够得到外形尺寸一模一样的铜活字了。
铸造铜活字使用的并不是纯铜,而是由铜、锡、铅等金属配制的一种合金,也就是一种青铜。青铜的强度和硬度都比纯铜大得多,在反复排版的压制纸型的时候才能保证不变形,延长使用寿命,同时也可以保证印刷质量的稳定。
每个铜字模的体积很小,铸字模具每次并不是只铸一个字,而是一次铸造16个,这极大地提高了铸造的效率。由几套模具轮流铸造或冷却,便能够形成连续生产,跟上化铜炉的效率,以节省燃料。
刻字是从常用字开始的,翻制泥模和铸造铜字的工作也在其后按步就班地进行着。也正是因此,当两位师傅完成一千多个木字模的刻制时,铸造出来的铜字已经超过了一万五千个,此外还有一大批标点符号、阿拉伯数字、空白铜字模及其他常用符号也被铸造出来,一些简单的书籍已经可以进行排版试印了。
现在印书坊当然没有专业的排版工,章泽天从技校的学生之中选了两个心灵手巧的孩子来学习排版。
铜字模整齐地码放在几个能够转动的圆形字模架上面,以方便排版时取用。两个尚处于学习期的排版工抱着木制的排字框,根据书稿选字排字。每一列铜字紧挨在一起,列与列之间则用铅制的薄板隔开,所以排好版的字迹列间距会大于同一列内的字间距(传统竖行排版)。
使用软质的铅板做列间隔板,可以通过每排完一列的挤压工序消除铜字模之间的尺寸误差,防止累积误差造成字模松动及参差不齐,提高排版质量。
压制泥片的轧辊同时也是轧制铅板的工具。铅比较软,可以轻松轧成预定的厚度,最后再用一个特制的切辊切成合适的宽度,刚好适合排版时使用。
排版的时候,铅条是一次性使用的。每次用过之后就要重新回炉熔炼,然后再重新轧片。
章泽天叮嘱负责加工熔炼铅的工人小心防护,以避免铅中毒。此时的人们还没有铅中毒的概念,若不是章泽天的摊牌叮嘱与强制命令,是没有人肯在大热天穿戴着厚重的防护服工作的,何况还是守着火炉熔炼的工作。
每排完一页,两个排版工会互相进行校对,以避免排版错误的发生。铜字上面都是反字,因为铸造难度的关系,活字的背后并不像后世的活字那样带有正字,所以排字的时候只能看反字选字,开始不熟练的时候,出错的机率还是相当大的。甚至有时候,两人互相校核都无法把错误挑干净,无奈之下只能请刻字师傅帮忙校核。
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