Patent EA-000387-B1 (EA)
Title: Method for manufacturing airtight and moisture-proof cardboard boxes
Inventor: SPRONK-DIK ANNA
IPC: B31B50/62
Filed: 1997-01-20
Abstract: 1. A method for manufacturing an airtight box from cardboard, wherein a blank (P) is cut out which comprises sidewall panels (1, 2, 3, 4) which are mutually interconnected through sidewall fold lines (5, 6, 7), end wall panels (8, 9, 10, 11) which are attached to the sidewall panels (1, 2, 3, 4) via respective end wall fold lines (13, 14, 15, 16), while the end wall panels (8, 9, 10, 11) are each bounded by two opposite free edges (8a, 8b, 9a, 9b, 10a, 10b, 11a, 11b) and a free end wall edge (17, 18, 19, 20) located opposite the end wall fold line (13, 14, 15, 16); wherein after the blank (P) has been cut out, at the location of the or each end wall fold line (13, 14, 15, 16) a flexible material strip (S) is connected at least substantially completely with the sidewall panels (1, 2, 3, 4) and a number of end wall panels (8, 10).through adhesion, which material strip is attached to each of a number of other end wall panels (9, 11) while leaving clear two triangular portions (2.1, 22; 23, 24) not provided with adhesive, located adjacent the free edges (9a, 9b; 11a, 11b) of the corresponding end panel (9, 11); wherein thereafter the blank (P) is erected to form the box through folding and adhesion, characterized in that the adhesive (G) for the purpose of adhering the material strips (S) to the blank (P) is applied in such a manner that the adhesive layer (G) on the relevant end wall panel (8, 10) terminates at some distance from the edge (9a, 9b, 11a, 11) of the adjacent end wall panel (9, 11), recesses (31, 32) being provided at the location of the edges (8b, l0a, l0b) of the end wall panel (8, 10) which are adjacent to an adjacent end wall panel (9, 11), which recesses are so wide that adhesive (Gv) for the purpose of attaching the material strip (S) to the corresponding end wall panel (8, 10) is exposed at that point, and thereafter adhesive (33) for the purpose of interconnecting the end wall panels (8-11) is applied so as to be in communication with said exposed material strip attachment adhesive (Gv). 2. A method according to Claim 1, characterized in that the recesses.(31) extend over the entire length of the edges (8b, l0a, l0b) of the corresponding end wall panels (8, 10). 3. A method according Co Claim 1, characterized in that the distance between the edges (8a, 8b;10a, 10b) of those end wall panels (8, 10) with which the material strip (S) is connected practically completely is substantially equal to the distance between the sidewall fold lines or sidewall edge (34, 5; 6, 7) of the sidewall panel (1, 3) with which the corresponding end wall panel (8, 10) is connected, while the or each recess (32) extends only over a part of the total length of the corresponding edge (8b, 10a, 10b). 4. A method according to any one of Claims 1-3, characterized in that the blank (P) is further provided with an adhesive panel (25) which is connected via an adhesive panel fold- line (35) to a longitudinal edge (35) of a sidewall (4) located at a free end of the blank (P), by means of which adhesive panel (25) the two sidewalls (1, 4) located at the free ends of the blank (P) can be interconnected through adhesion, while also the adhesive panel (25) is connected via an end wall fold line (36) to at least one end wall panel (12) with two opposite edges (12a, 12b) and a free end edge (37) located opposite the end wall fold line (36), and the edge (12a) of the relevant end wall panel (12) proximal to the adjacenc end wall panel (11) is further provided with a recess (31, 32) of the above-mentioned type. 5. A method according to any one of Claims 1-4, characterized in that the blank (P) is provided wich four sidewall panels (1, 2, 3, 4) and, at lease at one end, with four, first through fourth, end wall panels (8, 9, 10, 11) connected with the sidewall panels (1, 2, 3, 4); wherein first the sidewalls (1, 4) located at the ends of the blank are connected to each other, then the first and the third end wall panels (8, 10) with which the material scrip (S) is connected at least substantially completely are folded inwards and the second and fourth end wall panels (9, 11) are folded outwards to some extent, then the adhesive (33) for the purpose of interconnecting the end wall panels (8, 9, 10, 11) is applied and then the second end wall panel (9) and, lastly, the fourth end wall panel (11) are brought into the end position. 6. A method according to Claim 5, characterized in that if the second end wall panel (9) has a height corresponding with the width of the sidewall (1, 3) associated with the first and third end walls (8, 10), this second end wall panel (9) is provided at the free end edge (18) thereof with two recesses (38), which prevents the exposed material strip adhesive (Gv) from being covered as the second end wall panel (9) is brought into the end position. 7. A box obtained by the method according to any one of the preceding Claims.