Method for the continuous fabrication of tubular bodies,...

B - Operations – Transporting – 31 – C

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B31C 3/04 (2006.01) B29C 53/38 (2006.01) B29C 53/50 (2006.01) B31B 5/36 (2006.01)

Patent

CA 2134643

A continuous tubular box body production method, particularly for cardboard boxes, using a number of stacked longitudinal strips. After sizing the continuously moving strips (2, 3, 4), they are applied lengthwise against a stationary guide (8) ending in a mandrel (10) with a circumference defining the cross-sectional shape of the tubular body (1, 17), whereby each strip has a side flap on either side of the guide which is then folded down around the circumference of the mandrel (1) as the strips move therealong. The method is characterized in that the side flaps (2a, 2b; 3a, 3b; 4a, 4b) are at least partially asymmetrically folded down so that one of the flaps on each strip is folded down before the other, whereby various longitudinal joint configurations and arrangements may be achieved, wherein the joints are arranged above one another or offset in alternate directions.

A B R ? G ? L' invention concerne un procédé de fabrication en continu de corps tubulaires de boîtes, notamment en carton, au moyen de plusieurs bandes longitudinales superposées. Après avoir encollé les bandes (2, 3, 4) défilant en continu, on les applique longitudinalement contre un guide stationnaire (8) se terminant par un mandrin (10) dont le pourtour détermine le profil transversal du corps tubulaire (1, 17). Cette application, effectuée de façon que chaque bande présente un volet latéral de chaque côté du guide, est suivie d'un rabattement desdits volets sur le pourtour du mandrin pendant que les bandes défilent le long du mandrin (10). Le procédé est caractérisé en ce que l'on effectue le rabattement des volets latéraux (2a,2b; 3a,3b; 4a, 4b) de chaque bande au moins partiellement de manière dissymé- trique, de sorte que le rabattement d'un des deux volets d'une bande est achevé avant le rabattement de l'autre volet de cette bande. Cela permet de réaliser différentes configurations et dispositions des joints longitudinaux, par exemple superposés ou décalés alternativement dans un sens et dans l'autre.

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