Breathable flash evaporation composite sheet and manufacturing method thereof

The invention relates to a breathable flash evaporation composite sheet and a manufacturing method thereof. The composite sheet comprises the following raw materials: polyethylene; the water vapor throughput of the composite sheet is greater than 800g/(m < 2 >. 24h); the total luminous flux transmittance of the composite sheet is 6-20%; the initial nail rod tearing strength F0 of the composite sheet is 40-65N; i = (F0-F1)/F0 * 100%; 2 to 30 percent of I; f0 is the initial nail rod tearing strength of the composite sheet; f1 is the tearing strength of the aged nail rod; by adding the high-strength functional particles of the spinning raw materials and adjusting the spinning process, the composite sheet with better performance is obtained. 本发明涉及一种透气型闪蒸复合片材及其制造方法，复合片材的原料包含聚乙烯；复合片材的水蒸气通过量为大于800g/(m2·24h)；复合片材的总光通量透射比6～20％；复合片材的初始钉杆撕裂强度F0为40～65N；I＝(F0-F1)/F0*100％；I为2～30％；F0为复合片材的初始钉杆撕裂强度；F1为老化钉杆撕裂强度；本申请通过纺丝原料的高强度功能粒子添加以及纺丝工艺的调整，以达到具有较佳性能的复合片材。