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油纸雨水落管是把牛皮纸浸透熔融的沥青放之后,再连续绕在辊轴上制成的。它可以代替车间内部雨水落管。据初步试制结果来看,采用它有下列优点:(1)直径100公厘、长1公尺的成本不超0.5元(按牛皮纸1.5张×0.12元=0.18元,沥青0.4公斤×0.30元=0.12元,其他0.22元,共计如上数),比同尺寸钢管11元/公尺廉22倍,比铸铁管4.5元/公尺廉9倍,比缸瓦
The paper rainwater drop tube is made by soaking the kraft paper in the molten asphalt and continuously winding it around the roller shaft. It can replace the rain drop inside the workshop. According to preliminary trial production results, the use of it has the following advantages: (1) The cost of a diameter of 100 mm and a length of 1 meter does not exceed 0.5 yuan (1.5 pieces of kraft paper 0.12 yuan = 0.18 yuan, 0.4 kg of asphalt 0.30 yuan = 0.12 yuan, other 0.22 yuan, total number as above), 22 yuan cheaper than the same size steel pipe 11 yuan / metric, 4.5 yuan / metric than the cast iron pipe 9 times cheaper than the cylinder tile