| 摘要 |
<p>A box blank has a base, sides shorter than the length L of the base and end walls having tabs wrapping around the corners and engaging, by means of wedge- or dovetail-shaped projections, corresponding recesses in the side walls (Figure 4). PVC reinforcements may be provided at the joins between the tabs and side walls. The box can be formed from fluted polypropylene extruded board by scoring without cutting fold lines using a v-shaped wheel, greater pressure being applied across the grain, the board being overfolded e.g. by 120 degrees (Figure 7) and heat applied along the external edges to reduce stress and resistance to folding, allowing the sides to naturally stand at 90 degrees to the base. The blank is dimensioned to allow for compression and reduction of the material during the heat folding process and the edges of the base not bordering a side wall (8, Figure 3) are extended and have a chamfered corner for flush finish after folding. A lid for the box extends 75% of the depth of the box for easy removal. The sides of the box do not bow outwards and the material can be digitally printed.</p> |
