When the film (which can e.g. consist of about 50% polypropylene and 50% polyethylene) is drawn at an angle to the grain direction, e.g. perpendicularly thereto, 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 fibre grain from branch-point to branch-point, and when following different paths in this manne