| 摘要 |
This invention relates to packaging "sleeves", or multi-sided, tubular structures which may be used for packaging articles, as blanks for boxes, or the like, which are made from multiple layers of spirally wrapped strips of paper, fabric, or the like; which sleeves may have discrete corners at the junctures of their sidewalls, which corners may be permanent where rididity is desired, or foldable so that the sleeves may be flattened for storage and/or shipment. Such sleeves may be made by apparatus, and/or utilizing methods, in accordance with the present invention, which contemplates the formation of a subtantially cylindrical core over a cylindrical spindle, and transfering the core to axially oriented lines of rollers which are oriented radially to the axis of the spindle at sequentially increasing distances therefrom, whereby the sleeve, while still softened from the application of glue to its constituent layers, may be permanently distorted into its desired multi-sided, multi-cornered configuration, with desired radii at the corners and such grooves as may be desired to augment hinging to facilitate flattening of the sleeves.
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