Abstract: In regard to the case when a stretch film is wound round in a state of tension on amassed goods for packing the same, this invention is so designed that the film is split in the width direction and in parallel into a large number of narrow-width tapes, while it is stretched, in a process of winding the film around the goods and thereby diagonal spaces are formed naturally on a desired circumference of the amassed goods, so as to produce an airing effect on the amassed goods.

Abstract: A polypropylene strap for use in packaging articles. The polypropylene strap has a high tensile strength, a low elongation, a high ridigity, a high abrasion resistance, and flexible surfaces, and it is not easily split in the longitudinal direction. This strap has superficial layers stretched at a low draw rate of 1.2-3, and a inner portion stretched at a high draw rate of 10-18. The total thickness of the superficial layers is 5-50% of the total thickness of the strap. The strap is manufactured by stretching a belt-like material, which has been extruded from a die, in the lengthwise direction thereof at a volume ratio of 4-9, heating the surfaces of the resulting belt-like material to put the molecular chains in the superficial layers only thereof in a non-oriented state, and then stretching the belt-like material as a whole at a draw ratio of 1.2-3.

Abstract: A polypropylene strap for use in packaging articles. The polypropylene strap has a high tensile strength, a low elongation, a high rigidity, a high abrasion resistance, and flexible surfaces, and it is not easily split in the longitudinal direction. This strap has superficial layers stretched at a low draw rate of 1.2-3, and an inner portion stretched at a high draw rate of 10-18. The total thickness of the superficial layers is 5-50% of the total thickness of the strap. The strap is manufactured by stretching a belt-like material, which has been extruded from a die, in the lengthwise direction thereof at a volume ratio of 4-9, heating the surfaces of the resulting belt-like material to put the molecular chains in the superficial layers only thereof in a non-oriented state, and then stretching the belt-like material as a whole at a draw ratio of 1.2-3.