The production bottleneck for large, thick-walled parts is often not in the clamping stage, but in the plasticizing stage. Although PP and PE are common thermoplastics, when the weight of a single part exceeds several kilograms, plasticizing efficiency directly determines the entire production cycle.

      Recently, a high-strength screw and barrel configuration optimized for PP/PE materials has drawn attention. Its design approach offers valuable insights for large-container molding. Traditional screws, when handling large shot volumes, tend to generate excessive shear heat, leading to uneven melt temperature and inconsistent filling. In contrast, this solution increases the screw surface hardness and optimizes channel depth, thereby controlling frictional temperature rise while maintaining high-speed plasticizing.

      More critically, the direct benefit of "high strength" is improved wear resistance. Fillers such as calcium carbonate and talc are often added to PP/PE compounds, and their abrasive effect on the screw and barrel cannot be ignored. After months of continuous production of large chemical drums, a conventional screw may experience a reduction in diameter, resulting in lower plasticizing capacity and poor mixing. The high-strength material significantly extends the retention of precision, ensuring equipment stability.

      From actual production data, improved plasticizing capability translates into shorter cooling times and faster mold open/close cycles. For processors, this means a direct increase in output per unit of time. For brand franchisees or equipment agents, such a configuration reduces after-sales maintenance pressure — customers are less likely to complain about equipment reliability due to frequent screw/barrel replacements.

      Moreover, the solution's control over melt uniformity also indirectly reduces internal voids and sink marks in thick-walled parts. This is particularly evident in pressure tests of large water buckets..

Keywords:

      high-strength screw and barrel, PP injection molding, PE plasticizing, large container molding, plasticizing capacity.