| 摘要 |
<p>Material band (4), forming envelope (1), has width (Lb) more than four times larger than envelope width (Lp). Material band forms batt (7) with zone (10, 11) between sides (8, 9) with double thickness of material; its width (Lz) is equal or superior to Lp. Batt is pulled with rollers, and envelopes are formed in zone of double thickness. Batt is cut in length direction in two sections (14, 15). An Independent claim is also included for the plant to manufacture envelopes and copy frames.</p> |
