CAJ | 학술논문

基于复合共挤成型原理，建立了高密度聚乙烯(PE–HD)／玻璃纤维(GF)复合共挤有限元模型，采用有限元软件 Polyflow 对流道内熔体的三维等温非牛顿流动行为进行了数值模拟，给出了 GF 以不同速度移动时流道内熔体压力和速度的分布特点及变化规律。根据数值模拟结果确定了挤出工艺参数，研制了共挤模具，制备了 PE–HD／GF 复合带，并进行了力学性能测试。结果表明，随着 GF 移动速度的提高，流道内压力减小，熔体在复合成型段挤出速度明显增加；GF 移动速度达到一定值时熔体挤出速度均匀，移动速度过大则导致熔体速度分布不均匀。研制的PE–HD／GF 复合带拉伸强度保留率可达 GF 的82%。
기우복합공제성형원리，건립료고밀도취을희(PE–HD)／파리섬유(GF)복합공제유한원모형，채용유한원연건 Polyflow 대류도내용체적삼유등온비우돈류동행위진행료수치모의，급출료 GF 이불동속도이동시류도내용체압력화속도적분포특점급변화규률。근거수치모의결과학정료제출공예삼수，연제료공제모구，제비료 PE–HD／GF 복합대，병진행료역학성능측시。결과표명，수착 GF 이동속도적제고，류도내압력감소，용체재복합성형단제출속도명현증가；GF 이동속도체도일정치시용체제출속도균균，이동속도과대칙도치용체속도분포불균균。연제적PE–HD／GF 복합대랍신강도보류솔가체 GF 적82%。
Based on the forming principle of composite co-extrusion,the finite element model of high density polyethylene (PE–HD)/glass fiber(GF) composite co-extrusion was established. Three dimensional isothermal non-Newtonian flow behavior of melt in the mold channel was numerical simulated by using Polyflow. The distribution characteristics and variation law of pressure and velocity of melt with different GF feed speeds were given. The extrusion process parameters were determined and experimental mold for co-extrusion was developed based on the simulation results and PE–HD/GF composite tape was produced. The mechanical properties tests were conducted. The results show that the pressure in channel decreases with the feed rate of glass fiber increasing, and the extrusion speed of melt in composite molding zone is improved obviously. The melt extrusion speed is homogeneous when GF mobile speed reaches a certain value. But unstable extrusion speed will be induced with too high GF feed speed. 82 percent of GF’s tensile strength could be remained in PE–HD/GF composite tape.