Heavy duty spool

A heavy duty spool suitable for receiving a product, such as at least about 375 lbs. of product or at least about 2,800 unfilled plastic or paper bags sized to hold disposable diapers, said spool comprises:

• a pair of flange plates having respective inner and outer surfaces, said flange plates being connected to one another in a mutually parallel spaced relationship by a hollow outer core bridging said inner surfaces of said plates along an axis perpendicular to each of said plates, each said flange plate having a central opening and a plurality of alternating long and short anchoring slots intersecting said central opening and extending radially outwardly therefrom;
• said hollow outer core including a plurality of interlocks, each said interlock comprising three panels including a center panel and a pair of end panels, each said end panel being hinged to said center panel about a side fold line orientated parallel to said axis and including a locking arm extending from each end of each said end panel, each said locking arm being hinged to one said end of each said end panel about a first fold line orientated transverse to said axis, each said locking arm including a second fold line orientated transverse to said axis to form an L-shape, each said L-shaped locking arm including an integral flap lying between said first and second fold lines and a holding tab hinged to said integral flap along said second fold line;
• each said long anchoring slot having two said locking arms of different ones of said interlocks inserted therethrough in a direction orientated away from said hollow outer core, each said short anchoring slot having two holding tabs of a same one of said interlocks inserted therethrough in a direction orientated toward said hollow outer core, each said locking arm of each said same interlock being folded at the said first fold line toward one another, said holding tabs of each same said interlock being folded at said second fold lines and inserted through one of said short anchoring slots in a direction orientated toward said hollow outer core, said integral flaps lying adjacent said outer surfaces of said flange plates;
• and
• a hollow inner core having an exterior surface, said hollow inner core being received within said hollow outer core and said central openings, said end panels and said holding tabs forming ribs extending radially inwardly of said hollow outer core for leading support to said hollow outer core, each of said ribs having a rib edge which abuts the exterior surface of said hollow inner core so that said hollow inner core lends support to said hollow outer core through said ribs.