| 摘要 |
<p>A strip (14) of stretch-wrap material having flat, double thickness hems (24, 26) at opposite margins is formed on an apparatus including a first roller (16) having a width less than the width of stock material fed into the machine, whereby opposite margins (18, 20) of the stock material project beyond opposite ends of the roller (16), and a second roller (22) for guiding the strip at an acute angle from the first roller (16) for causing the opposite marginal portions (18, 20) to fold. The strip (14) is maintained under tension by a take-up roller (32) or other means, and guide bars (28, 30) are provided for further folding the marginal portions past 90 DEG angles so that they continue to be folded inwardly against the main body of the strip. <IMAGE></p> |
