热塑性树脂LDPE长圆形中空体口模流道优化设计

目的 探索特殊的进料方式和分流流道，以满足长圆形分流均衡的特殊性需求。方法 运用流体力学对LDPE树脂流动进行力学分析，研究长圆形中空体成型质量与口模流道分流区数量、缝隙的关系，确定最佳的口模流道分流区数量、缝隙，并通过试制结果来验证分析数据的准确性。结果 采用1个衣架流道和6个区域的狭缝流道，衣架流道采用2个进口，并且狭缝流道的6个区域缝隙分别为4、3、3.5、1、5和1 mm时，长圆形中空体成型质量可以达到最佳效果:壁厚均匀性好，偏差小于0.15 mm;外表光滑无带褶皱竖纹;竖直度好，偏斜度小于3 mm。结论 文中设计方案先进、有效，可以用于包装用LDPE塑料瓶生产过程中的长圆形中空体成型过程。

Optimization Design of Die Flow Channel of Thermoplastic Resin LDPE Long Hollow Cylinder

The work aims to explore the special feed mode and flow channel to meet the special demand for long round hollow flow balancing. Fluid mechanics was used to analyze the flow of LDPE resin and study the relationship between the forming quality of long hollow cylinder and the number and gap of die flow channel so as to finalize the best number and gap of die flow channel and verify the accuracy of the analysis data by trial results. When 1 coat-hanger channel (2 inlets) and 6 slit channels (4, 3, 3.5, 1, 5 and 1 mm) were adopted, the forming quality of long hollow cylinder was the best:uniform wall thickness with deviation less than 0.15 mm, smooth outer surface without wrinkles and lines and good verticality with skewness less than 3 mm. The proposed design scheme is advanced and effective, which can be used to form long hollow cylinder in the production of LDPE plastic bottle for packaging.