以低密度聚乙烯和线性低密度聚乙烯（60:40）为基础物质，添加阻燃剂聚磷酸铵，构成阻燃体系，研究了阻燃体系的成型加工工艺参数和阻燃性能。研究表明：APP含量为30%时，阻燃性能达到FV-0级；造粒时，螺杆转速选择28~37 r/min，牵引速度选择2.8~5.5 m/min；制造哑铃型试样时，料筒温度在185~200 ℃之间，模具温度在91~105 ℃之间，预热5~10 min，充模时间12~21 s，制造矩形试样时，料筒温度在185~190 ℃之间，模具温度在85~110 ℃之间，预热5~10 min，充模时间8~13 s。

Low density polyethylene and linear low density polyethylene were used as basic materials and ammonium polyphosphate was added into them to prepare fire-retardant system. The molding technology parameters and fire-retardant properties of the fire-retardant system were studied. The results showed that when ammonium polyphosphate content is 30%, the fire-retardant level can reach FV-0; the rotational speed of main screws is 28~37 r/min, the pulling speed is 2.8~5.5 m/min; when molding dumbbell samples, the cylinder temperature is between 185~200 ℃, the mold temperature is between 91~105 ℃, the warm-up time is from 5 to 10 min and molding time is from 12 to 21 s; when molding rectangular samples, the cylinder temperature is between 185~190 ℃, the mold temperature is between 85~110 ℃, the warm-up time is from 5 to 10 min and molding time is from 8 to 13 s.