挤压前必须把材料弄干，包括把含tpu在内所有原材料弄干。最好湿度在0.02%或者一下。
It is imperative to dry the material immediately prior to extrusion. This includes all raw materials containing TPU. Best results are obtained with 0.02% or less moisture content.
其影响因素主要有：粉尘的比电阻，含尘浓度，粉尘颗粒组成，气体成分，温度，湿度，收尘的漏风等。
The main factors: the dust resistance, the concentration of dust, particles of dust, gas composition, temperature, humidity, air leakage, such as the collecting.
铁水中氢、氧气体含量随空气湿度升高而显著增多，而含氮量基本不变。
The hydrogen and oxygen contents in the molten iron markedly increased with blast humidity, while the nitrogen content had nearly no detectable change.
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