Bulk bag with conical top

A collapsible bag suitable for containing material in bulk comprising:

• (a) tubular blank of a flexible material having a circumferentially continuous peripheral wall adapted in use to have the axis of the tubular blank oriented upright and having axially opposite top and bottom blank edges extending transverse to such axis, said blank when collapsed into a compact configuration having six fold lines extending longitudinally from said top to said bottom edges of said blank, with two pairs of said fold lines individually defining laterally opposite outer side edges of a pair of overlying generally rectangular panels, a pair of generally rectangular folded gusset panels being received one between each pair of said overlying rectangular panels and being defined at their overlaid interior side edges by an associated one of the remaining two of said six fold lines,
• (b) said collapsed blank having four top corners formed one each at the intersection of said blank top edge with each of said outer side edge fold lines, said blank having a line of connection at each of said top corners joining the mutually facing surfaces of each gusset panel and exteriorly adjacent side panel to define four seams extending individually one along each associated said line of connection diagonally across each of said top corners, each said seam being oriented to extend at an angle of about 45 degrees relative to the associated blank top edge and sidewall panel outer side edge, each said seam thereby forming a triangular pleat of overlapped material in the portion of the associated gusset panel and exteriorly adjacent side panel defined between said seam, said blank top edge and associated sidewall panel outer side edge fold,
• (c) said tubular blank with said seams so formed therein, when turned inside out to invert the same and expanded into upright orientation for use, having a circumferentially continuous sidewall with said four outer side edge fold lines forming said sidewall into a sidewall of generally rectangular configuration in horizontal plan cross section having two pairs of laterally mutually opposed sidewall panels of generally rectangular configuration in elevation, said blank when so inverted causing each said seam to draw inwardly from said continuous sidewall a narrow portion of all of said sidewall panels extending along said blank top edge and thereby forming four inturned shoulder panels defining a circumferentially continuous seam-joined planar top border along the top of said sidewall oriented generally perpendicularly thereto, each said shoulder panel having an outer edge defined by a fold line with the associated one of said sidewall panels and extending horizontally between the intersection of an associated pair of said seams with said outer side edge fold lines of the associated one of said sidewall panels, each said shoulder panel having an inner edge extending parallel to its outer edge between the intersection of said associated pair of said seams with said blank top edge, each said seam when so inverted in turning said blank inside out having the associated pleat portion of said associated gusset panel and exteriorly adjacent side panel extending interiorly of said shoulder top border and said sidewall panels,
• (d) a bottom wall secured to and extending inwardly from said bottom edge of said blank when expanded,
• (e) a generally frustoconical top wall vertically opposite said bottom wall joined in underlying relation to and extending inwardly from the interior surface of each of said shoulder panels when said blank is inverted and expanded for use, said top wall having an inlet opening located centrally in said top wall, and
• (f) an inlet spout attached in underlying relation to the interior surface of said top wall when said blank is inverted and expanded for use, said spout encompassing said inlet opening.