2-17_2213123
3 year ago
1. According to the purpose, it can be divided into:
Ordinary type: also known as light film, flat film. Used for printing, compounding (transparent type, matting type), coating (adhesive tape and PVDC coated film base film). It is the most widely used and the largest variety of film products; printing film, composite film, tape film, bag making film, matting film, etc. are all flat films.
Heat-sealing type: used for ordinary packaging, such as cigarette packaging film, three-layer heat-sealing film, five-layer gas barrier film, pearlescent film, coated heat-sealing film, etc.; heat-sealing film and laser film are heat-sealing films.
Label film: used for commodity labels, advertising printing, books and magazines, bottle labels and overall packaging, etc.;
Metallized film: used for vacuum aluminum plating;
Capacitor film: used in capacitors and metal capacitors.
Thermal shrinkage mainly reflects the dimensional thermal stability of BOPP film. For packaging, proper heat shrinkage can improve the packaging effect [3]. For hard cigarette packs, the thermal shrinkage rate of BOPP cigarette film is required to be relatively large, about 7% to 11%, so as to achieve a flat, compact and bright appearance effect, but for soft cigarette packs, the shrinkage rate should be relatively small, about 3% to 3% 6%, to prevent excessive shrinkage from causing deformation of the carton, or even crushing the cigarettes
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