The main performances of the soft PVC product and the PVC-U pipes for chemical industry meet the standard requirements with the tailing powder of 60% and 20% as filler respectively.
以尾矿粉60%和20%的填充量分别制得了软质PV C板材和化工用PVC - U管材，制品的主要性能指标均达到标准要求。
The operating principle, design philosophy, determination of the main design parameters, structure characteristics and the key parts of the extrusion mould for PVC-U pipes were analyzed theoretically.
对PV C - U管材挤出成型模具工作原理、设计原则、主要设计参数的确定、结构特点及关键部件进行了理论分析，并结合生产中取得的经验数据加以改进。
The development trend of PVC - U pipes was analyzed on the basis of the whole plastic pipe industry.
从塑料管道整个行业上分析了PVC-U管道的发展趋势。
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