将适量的聚乙烯（ＰＥ）和乙烯－乙酸乙烯酯共聚物（ＥＶＡ）与一定量的炭黑混合造粒，用塑料挤出机在１７０℃下挤出圆柱体，并引入两根裸铜线，通过牵引装置将圆柱体拉伸使其产生分子内应力，经一对辊筒压成带状．然后迅速冷却，使导电炭黑聚集在靠近带体表面层．最后挂上一层绝缘皮，便得到自限温加热带． A suitable amount of polyethylene (PE) and ethylene-vinyl acetate copolymer (EVA) were mixed and granulated with a certain amount of carbon black. The cylinder was extruded at 170° C. using a plastic extruder and two bare copper wires were introduced. The cylinder is stretched by a traction device to generate intramolecular stress and is rolled into a ribbon by a pair of rollers. And then quickly cooled, so that conductive carbon black gathered near the belt surface layer. Finally, a layer of insulation is hung to obtain a self-limited temperature heating tape.