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第83章 烧砖过程(1 / 2)

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整个装窑的技术要求,必须遵循窑火燃烧循环规律,服从于烧窑的技术规则,全面把握“两紧三松”的原则,即拦火紧、中部紧和底部松、窑壁松、顶部松,以满足充分利用火势和均匀控火的需要,有效防止窑内砖瓦因火势不均出现局部变形、焦流或夹生等损坏。

在整窑砖坯逐渐装满时,叶桑和螣仓还有后面加入进来的几位族人则从“二窑门”边装边退,用石头封堵结实,亦用黄泥密封抹平。

之后的程序是往“火庭”装炭。

“火庭”下面是漏灰层,也叫“灰庭”,两“庭”中间用生铁铸就的三棱“燎”架起。

叶桑进入到“火庭”内,在里面顺炭纹立茬层层摆设,亦逐渐退出,在入口处留适当大小的“柴窝”放入易燃的干草,再放些容易染火的木柴,俗称“绒柴”和“硬柴”。

装了炭,接下来便可以砌砖封堵“大窑门”了。

“大窑门”是整个砖窑烧制的“工作面”或“操作台”。

一般按二四墙自下而上封堵,相隔适当距离要留出上下两层“哨眼”,或称“火眼”,下层较大。

可为两砖卧立填塞的尺寸,上层缩小约一半左右,可为一砖卧立填塞的尺寸,均为用铁制的“炉锥”或叫“火钩”捅火抖灶所用。

其上改由一二墙垒砌,砌砖与面向火庭的一面齐平,于底部正中留约尺五见方的“火门口”,下边突出的窄台搁置“火门挡”。

烧窑时由“火门口”往“火庭”里添炭续火。

“火门”上又留约拳头大小的“风眼”,也作“了望孔”之用,烧窑时用来协助调控和观察火势,火势正常或稍小时基本封闭,火势大时打开进风以减弱火势。

最后亦用黄泥将整个“工作面”抹面加固。

书上说,装炭和垒砌“大窑门”的这些工序统称“讫理”,或为“砌垒”均可,到此便万事俱备,只待燃薪点窑。

点火也考究。

一般是在下午或傍晚,有时也会在中午,只要不是刮风天,无论阴晴,白天任何时间都可点火。

如遇风大的天气,则须等到傍晚时点火。

窑内炭火基本一晚上便可燃旺,第二天清早即需添炭加火。

添火的迟早也要看天气,刮风天炭火燃烧得快一些,添火也要提前。

一般从点火的时间算起,到当天晚上或是第二天上午,任其自行燃烧,这一过程称为“熏窑”。

“熏窑”时间长短由砖瓦干湿程度决定,中间会酌情添加适量炭火,皆以文火来烧。

这一阶段窑壁上内嵌的“烟道”是用石头盖上的,主要环窑壁排烟。

到了这一步,可稍事歇息或安心睡上一觉,以消减连日来装窑的疲乏,好攒足精神开始接下来连续四五天昼夜熬眼添炭看火。

烧窑更加讲究,而成败就在此举了,叶桑晚上都没办法睡好觉,就怕失败。

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