| 摘要 |
In a sack or bag intended for filling with loose material, a lower end 4 has a conventional block-bottom whilst the upper end 5 includes a generally rectangular open filling aperture 20 bounded along two opposing edges by a pair of guide flaps 8,9. The guide flaps serve to direct the material into the container and when filling is complete are overlapped and secured adhesively. The bag may be single or multi-ply of paper, plastic sheeting or metal foil. |
