In order to solve the problems of pipe diameter of polyester‐ramie nonwoven lining material used for sewage pipelines rehabilitation, the mathematical model of pipe diameter of lining material was established by using elastic mechanics method and composite piping design. The mixing ratio, the fiber web quantification and the needle‐punched density were selected to optimize the manufacturing process of polyester‐ramie nonwoven with thermal shrinkage rate and elongations at break, the results showed that the mixing ratio was 0.7, and the fiber web quantification was 600 g/m², and the needle‐punched density was 180 thron/cm². Under this process, the thermal shrinkage rate is 8.72%, and the elongation at break is 83%, which is close to the theoretical value, indicating that the response surface method has practical application value. Combined with the mathematical model and the optimal condition of manufacturing process, the design extremum of pipe diameter of lining material for sewage pipelines with different pipe diameters is predicted, which provides the theoretical basis for the preparation of polyester‐ramie nonwoven composites for pipeline rehabilitation.

中文翻译：

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管道修复用涤纶麻无纺衬里管径设计

为解决污水管道修复用涤纶ie麻无纺衬里材料的管径问题，运用弹性力学方法和复合管道设计方法，建立了衬里材料的管径数学模型。选择混合比，纤维网定量和针刺密度以优化热收缩率和断裂伸长率的聚酯ram麻非织造布的制造工艺，结果表明混合比为0.7，纤维网定量为600 g / m ²，针刺密度为180 thron / cm ²。在此过程中，热收缩率为8.72％，断裂伸长率为83％，接近理论值，表明响应面法具有实际应用价值。结合数学模型和制造工艺的最佳条件，预测了不同管径污水管道衬里材料的管径设计极值，为制备涤纶ram麻无纺布复合材料提供了理论依据。