| 摘要 |
The present invention discloses a construction for flexible intermediate bulk containers which provides additional strength along the upper periphery, to preclude the tearing out of the material when a loaded container is lifted by a single lifting loop. By folding the upper portion of the container over upon itself, two layers of material are provided along the upper periphery, effectively doubling the strength of that portion of the container to which the lifting loops are attached. The second layer of material is extended downwardly along the side of the container at least a distance equal to the length of the lifting loop legs to be attached thereto. The lifting loop web straps are then sewn through the two layers of material, preferably with a series of box stitches. Additional resistance to cutting due to the lifting loop web material may be provided by a redoubling of the upper periphery of the container to provide four layers of material at the upper rim, or alternatively by including a peripheral web strap along the upper periphery of the container. The construction of the present invention is applicable to bulk containers formed of either plural sheets of planar material, or to seamless tubular material of virtually any type. The folds and/or the peripheral web attachment may be formed and/or attached either inwardly or outwardly with equal facility.
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