目前国内各胶鞋厂家所使用围条挤出机多为三腔式结构，亦即一次可挤出三色围条。三色围条一次挤出减化了成型作业、增加了外观美感，但对三色围条的回余胶料的处理，却给厂家带来了很大的困难：处理到海绵胶中，影响其发泡均匀程度；处理到里后跟中，则会因粘性大而影响脱卷； At present, all domestic rubber shoe manufacturers use a three-cavity structure for the wrap extruder, which means that three-color strips can be extruded at one time. Tri-colored strips reduce extrusion molding operations and increase the appearance of aesthetics, but the treatment of regrind material on the tri-color strips has brought great difficulties to the manufacturers: handling to the sponge adhesive, affecting The degree of foaming uniformity; after treatment in the middle, it will affect the decoiling because of the large viscosity;