时效稳定型高收缩BOPP烟膜的研究

Study on Time-stability Masterbatch for Highly Shrinkable BOPP Film of Cigarette Packaging

研究了温度和时间对双向拉伸聚丙烯(BOPP)烟膜热收缩率的影响。结果表明:在生产下线的1周内,BOPP 薄膜的聚集态结构处于不稳定状态,薄膜的热收缩率下降较快;夏季由于温度高,热收缩率比冬季降低速度快,特别是在1个月后,下降的幅度加大。针对此问题开发出一种时效稳定母料并应用于高收缩烟膜,取得了良好的效果。在明显提高烟膜热收缩率的同时,改善了热收缩率的稳定性,特别使夏季高温下烟膜的热收缩率有较大比例的提高,钝化了热收缩率对温度的敏感性。研究表明该母料对烟膜的力学性能、光泽度、雾度、热封性能、爽滑性能以及加工性能没有负面影响。

The change in shrinkage of bi-axially oriented polypropylene （BOPP） cigarette pack film with temperature and time was studied. The thermo-shrinkage of the film decreased continuously after it was prepared, the decreasing rate in winter was lower than summer because of low temperature. A novel time-stability masterbatch was developed and introduced into the cigarette pack film. The masterbatch lowered the sensitivity of thermo-shrinkage to both temperature and time, thus retarded its decrease with time and eliminated the effect of high temperature in summer. In addition, the masterbatch did not result in negative effect on mechanical properties, gloss, haze, heat seal property, slip behavior, and processing of the film.