When the film (which can e.g. consists of about 50% polypropylene and 50% polyethylene) is drawn at an angle to the grain direction, e.g. perpendicularly hereto, then the fibre portions, as seen on a micro-scale, will deflect and branch out, but it is still possible to follow the zig-zagging path of the grain from branch-point to branch-point, and when following different paths in this manner it w