| 摘要 |
<p>Containers are produced from a sheet (200) of flexible material having a thermally bondable inside surface. In one embodiment flaps (205/206) are formed and folded outwardly to form two windows (208, 209) in the sheet. Pleasts (211/212) are formed and bonded to transverse the windows so that a pleat ply closes the windows. The pleats (211/212) are folded to bring the flaps (205/206) against the window closing pleat plies and bonded. In another embodiment holes (230/231) are cut in the sheet (200) located in one ply of the pleats.</p> |
