| 摘要 |
The package is formed from heat sealable longitudinally folded sheet material 38 and comprises a first folded edge portion 38 extending in a first direction and seams S1, S2 making an acute angle with the first direction and converging, travelling away from the edge portion 38. The package may be left open along the edge opposite the folded edge or closed by further seams S3, S4 parallel with the first edge portion 38 (Figs. 5 & 7). The package is made by a method using a heat sealing apparatus in which sheet material 28 is fed in a direction B to a heat sealing assembly having heat sealing bars 14 which can be pivoted towards and away from a support table 20. The bars are inclined at adjustable acute angles to either side of a line extending at right angles to the direction B and to the axis A about which the bars 14 are pivoted. One seam S1 may be sealed by the upstream bar 14 and the other seam S2 by the downstream bar. The package, apparatus and method are especially suitable for packaging generally triangular articles. <IMAGE> |
