초록 ▼

A continuous tubular box body production method, particularly for cardboard boxes, using a number of stacked longitudinal strips. After sizing the continuously moving straps (2, 3, 4), they are applied lengthwise against a stationary guide (8) ending in a mandrel (10) with a circumference defining t

A continuous tubular box body production method, particularly for cardboard boxes, using a number of stacked longitudinal strips. After sizing the continuously moving straps (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, 1b; 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.

대표청구항 ▼

In a process for continuous manufacture of tubular container bodies (17) from a plurality of continuously moving, superposed longitudinal webs (2,3,4) wherein: glue is applied on at least one surface of at least one of said webs (2,3,4) and said webs are then applied lengthwise against each other in

In a process for continuous manufacture of tubular container bodies (17) from a plurality of continuously moving, superposed longitudinal webs (2,3,4) wherein: glue is applied on at least one surface of at least one of said webs (2,3,4) and said webs are then applied lengthwise against each other in a superposed relationship and against a longitudinally extending, stationary guide (8) that terminates longitudinally in a mandrel (10) having a circumference defining a transverse profile of said container bodies (17); and said webs (2,3,4) are applied against each other and against said guide (8) along a longitudinally extending generating line of each of said container bodies so that each web has two side flaps (2a,2b;3a,3b;4a,4b) on opposite lateral sides of said generating line and said guide (8) and then said side flaps are folded around said guide (8) and said mandrel (10) while said webs move longitudinally along said guide and said mandrel; the improvement comprising the steps of: a) successively applying and folding each of said webs (2,3,4) against said guide (8) and along said generating line, so that the two side flaps (2a,2b) of an inner first web (2) of the container body (17) are partially folded around said guide (8) and said mandrel (10), but are not completely folded around said guide (8) and said mandrel (10), before an adjacent outer second web (3) of the container body is applied against said guide, whereby the successive application and folding of each of said webs (2,3,4) against and around said guide (8) and said mandrel (10), after partially folding respective side flaps (2a,2b;3a,3b;4a,4b) of previously applied webs (2,3,4), avoids glueing between said webs (2,3,4) in parts which are not completely folded and shaped around said guide (8) and said mandrel (10); and b) folding at least partially asymmetrically said two side flaps (2a,2b;3a,3b;4a,4b) of each web (2,3,4) about said guide (8), so that one of the two side flaps of each inner web is completely folded around said guide (8) before the other flap of the inner web is completely folded around said guide (8); said other flap being completely folded around said guide (8) before a first flap of an adjacent outer web is completely folded around said guide (8).