Patent ID: 6323502
Filing Date: 2001-11-27
Classification: B31B,G01B,G01N

Abstract:
A method for checking the accuracy of folding a parallelepiped box made from a cardboard blank (1) comprising four adjacent panels P.sub.a, P.sub.b, P.sub.c, P.sub.d extending between two opposite parallel longitudinal edges of the cardboard blank (1), the panels' (P.sub.a, P.sub.b, P.sub.c, P.sub.d) transverse sides being aligned along two parallel transverse lines (2, 3), one of the two opposite parallel longitudinal edges of the cardboard blank (1) being provided with a gluing tab (15), at least some of the transverse sides of the adjacent panels (P.sub.a, P.sub.b, P.sub.c, P.sub.d) being provided with flaps (R.sub.a1, R.sub.a2, R.sub.b1, R.sub.b2, R.sub.c1, R.sub.c2, R.sub.d2, adapted to close the top and bottom surfaces of the box, longitudinal folding lines being formed between the panels (P.sub.a, P.sub.b, P.sub.c, P.sub.d) and transverse folding lines being formed between the panels and the flaps (R.sub.a1, R.sub.a2, R.sub.b1, R.sub.b2, R.sub.c1, R.sub.c2, and R.sub.d1, R.sub.d2), slots (5, 6) having parallel longitudinal slot edges being formed between the adjacent flaps (R.sub.a1, R.sub.a2, R.sub.b1, R.sub.b2, R.sub.c1, R.sub.c2, and R.sub.d1, R.sub.d2), the box being formed by folding two side panels (P.sub.a P.sub.d) adjacent the opposite longitudinal edges of the cardboard blank (1) onto the two central panels (P.sub.b, P.sub.c) in order to join the opposite longitudinal edges of the cardboard blank (1) so that the gluing tab (15) overlaps, forming a junction, the method comprising measuring the spaces between the slot edges of the slots (5, 6) of the flaps (R.sub.a1, R.sub.d1, R.sub.a2, R.sub.d2) situated on either side of the junction and comparing the measured spaces between the flaps (R.sub.a1, R.sub.d1, R.sub.a2, R.sub.d2) with a predetermined standard spacing between the flaps (R.sub.a1, R.sub.d1, R.sub.a2, R.sub.d2) in order to determine whether the box is a defective box.