B - Operations – Transporting – 31 – B
Patent
B - Operations, Transporting
31
B
93/5, 229/31.5
B31B 7/00 (2006.01)
Patent
CA 1254427
ABSTRACT METHOD OF REINFORCING CARDBOARD BOXES The invention relates to the production of cardboard cartons and in particular it relates to a method for the production of a presentation box of high mechanical strength from a pregrooved or prescored blank (1) of a cardboard of small thickness which is able to accept offset printing and to be grooved or scored according to conventional mechanical or HF methods. The method of the invention consists in selectively reinforcing the parts (25 to 29) of the blank (1) which are not traversed by a grooved or scored line (6 to 8 and 16 to 22) in such a manner as to leave non- reinforced parts enabling subsequent forming to shape of the box, at either side of the different grooved or scored lines. This reinforcement may be provided by the application of cutouts of an auxiliary material positioned and bonded by high frequency on the parts which are to be reinforced, or by a complete or partial impregnation of the cardboard blank (1) with a hardenable polymerizable resin and an HF treatment serving to produce a localized hardening of the resin in the parts which are to be reinforced. The invention is applicable in particular to the production of boxes for the packaging of heavy objects.
467522
Dupuy Engineering (s.a.)
Robic Robic & Associes/associates
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