| 摘要 |
A bag comprises two sidewalls 52, 54, a tongue 68 disposed inwardly of each sidewall and walls 84 connecting the base of the tongue to the top of the sidewalls and is suitable for packaging coffee, tea or detergent. The tongues extend parallel to the sidewalls. The tongues 68 width is preferably smaller than that of the sidewalls 82, 84 and its lower end preferably disposed lower than the top of the sidewalls. The bag can be a DOY bag which comprises a w-shaped gusset (58, figure 4) at the base of the bag. The bag preferably has stiffening seals along all its edges 88 and between the edge of the sidewalls and the top of the sidewalls 90. A zip closure (78, figure 4) may be provided. The method and apparatus for making the bag comprise means for forming a continuous web (figures 7-11) which comprises sidewalls and tongues extending generally parallel to and inwardly therefrom via connecting walls and means for forming seals transversely across the web (figures 12 and 14). The packaging materials for forming the web may be fed downwards to form the web and the web may be fed downwards prior to being filled, sealed and separated and having its tongues trimmed. The sealing means may comprise rotary opposed drums with heating surfaces extending circumferentially (444, figure 14) and longitudinally (446, figure 14) around the drum. The forming means may comprise means for fusing a plurality of webs, preferably three, into a continuous web which can contain a w-shaped base wall. |
