摘要
理论分析了BMC(预制整体模塑料 )在注射喷嘴收敛流道内的延伸应变速率分布 ,引入延伸应变速率积来衡量BMC熔体中玻璃纤维断裂破坏及其对制品强度影响的程度。结果表明 ,延伸应变速率和延伸流道长度是喷嘴收敛流道影响制品强度的 2个因素 ,而这 2个因素与流道收敛角有密切的关系 ;延伸应变速率积越大 ,制品的强度相应地越低 ;为尽可能提高BMC注射制品的机械强度 ,最后理论结合实验找出较合适的注射喷嘴收敛半角范围为 2 0～ 3 5°。
The distribution regularity of elongational strain rate of BMC flowing through a conical converging flow channel were analyzed. An important parameter——integral of elongational strain rate to describe the breakage of fiberglass was introduced. The results showed that the elongational strain rate and the length of the flow channel were two factors affecting product strength. The greater the integral of elongational strain rate was, the lower the strength of BMC injection molding products was. Finally, with the help of experiment and theoretical analysis, an ideal range of converging half-angle 20～35° was achieved.
出处
《现代塑料加工应用》
CAS
2004年第6期44-47,共4页
Modern Plastics Processing and Applications
关键词
模塑料
流道
注射制品
喷嘴
熔体
BMC
玻璃纤维
衡量
影响
延伸
bulk molding compound
elongational strain rate
tensile strength
converging half-angle
flow channel
