| 摘要 |
The invention provides a process for making a dry powder box with greater geometrical stability and free of pin holes, gaps and the like through which powder may sift. The process uses a carton blank having a bottom closure wherein a pair of relatively large, opposing dust flaps are first folded into the carton tube, in order to define, maintain and stabilize the cross section of the carton. Then, a pair of relatively smaller, opposing major flaps are folded and glued over the open sides of the large dust flaps. This combination of flaps keeps the large flaps from working out of alignment and helps maintain the cross sectional stability of the box. The top of the carton may be a gable having panels at the ends of the gables which are slightly larger than the cross section, of the gable roof sides. When the gable is formed, the larger ends are pushed down to create a leverage which closes the top opening more securely. The cut lines which form and define the flaps extend across approximately 80 DEG of the width of the flap, thereby leaving about 20% of the blank to form a bulk in the corner of the box. This cut line has a taper of about 15 DEG to 40 DEG . Thus, upon folding the flaps at both the top and the bottom, there is a small amount of bulk which must crumple together so that no pin holes are formed at a corner of the box.
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