Abstract: A large bulk bag formed from a tubular blank of woven fabric having inwardly folded gusset panels along opposite side edges. While in the flattened condition, the blank is sewn along predetermined stitch lines and severed at predetermined portions so that, when the stitched and severed blank is expanded, it forms a bag of rectangular cross section having a closable spout at one or both ends. If a liner is to be used in the bag, the liner is formed from a gussetted tubular blank and sealed and severed along lines corresponding to the stitch severing lines on the bag so that the flat liner can be inserted into the flattened bag with the gussetted portions of the bag and liner interfitting in interleaved relation and the spout on the liner extending through the spout on the bag.

Abstract: The rotary heat cutter comprises a heating element adapted to be rotated into engagement with a taut section of plastic web to sever the web transversely while the web is traveling in a straight path. Means are provided for constraining the heating element to move at the same speed as the plastic web when the heating element engages the web.

Abstract: A collapsible drum-type container is formed by scoring lines on a generally rectangular blank of fiberboard or the like so that the blank can be initially folded along one score line into two flat overlying panels. The longitudinal free edges of the panels are sealed together to form a flattened tube. The flattened tube is then opened and refolded along other score lines to provide a flat envelope having an upper open end and a closed lower end defined by an inwardly folded gusset panel between the two side walls of the refolded flattened tube.