Production of BOPP film is made from polypropylene polymer melt through the long and narrow nose first sheet or thick film, and then within the special drawing machine, under certain temperature and the set speed, at the same time or in the vertical direction (two step by step
The longitudinal and transverse)
On the drawing, and through the appropriate cooling or heat treatment or special processing (
Such as corona, coating, etc. )
Made of thin film.
< br /> BOPP film commonly used include: ordinary two-way stretching polypropylene film, heat sealing type two-way stretching polypropylene film, cigarette packaging film, two-way stretching polypropylene film, two-way stretching metallized polypropylene film, matt film, etc.
Advantage of < br /> < br /> BOPP film is a kind of very important flexible packaging materials, BOPP film colorless, odorless, tasteless, non-toxic, and have high tensile strength, impact strength, rigidity, strong toughness and good transparency.
BOPP film surface energy is low, need to corona treatment before coating or printing.
After corona treatment, BOPP film has good printing adaptability, can be color printing and elegant appearance, so commonly used as the surface of composite film material.
< br /> < br /> BOPP film production process can use tube membrane method or the method of film production.
Different processing methods of BOPP film performance is different also.
The method of film production of BOPP film (because of the large draw ratio
Up to eight
, so the strength is higher than tube membrane, membrane thickness uniformity is better also.