一种平肩式塑料挤出平模头,涉及一种片材挤出模头。它包括第一模头组件和第二模头组件,第一模头组件内侧面和第二模头组件内侧面之间形成挤出流道,挤出流道从上到下依次包括进料区、扩散区、分配区和挤出区,其特征在于:扩散区顶边为一条直线段,该扩散区顶边与平肩式塑料挤出平模头底端的模唇平行。平肩式塑料挤出平模 A flat-shouldered plastic extrusion flat die relates to a sheet extrusion die. Which comprises a first die assembly and a second die assembly, an extrusion flow path is formed between the inner side of the first die assembly and the inner side of the second die assembly, the extrusion flow path comprises, in order from top to bottom, a feed zone , A diffusion zone, a distribution zone and an extrusion zone, characterized in that the top edge of the diffusion zone is a straight line segment, and the top edge of the diffusion zone is parallel to the die lip at the bottom of the flat-shoulder plastic extrusion flat die. Flat shoulder plastic extrusion die