Patent GB-1238746-A (GB)
Inventor: BARNES B I
IPC: B65B7/20
Filed: 1969-09-12
Abstract: 1,238,746. Folding cartons. POTLATCH FORESTS Inc., [trading as FINN INDUSTRIES DIVISION OF POTLATCH FORESTS Inc.]. 12 Sept., 1969 [12 Sept., 1968], No. 45164/69. Heading B8C. In a method of sealing the opposite ends of a paper board carton filled for example with ice cream, the carton is rotated from a vertical-end uppermost-position where at least the set of flaps at the lower end are loosely folded down, to a horizontal position where at least one of the top and bottom flaps at each end is moved to a horizontal position while a continuous line of bonding material is applied to each end of the carton, the horizontally extending flaps being finally folded down and pressed against the corresponding side flaps until the bonding material has set. As shown, cartons 15, 16 filled with ice cream and with top and bottom sets of four closure flaps loosely closed, are moved along a conveyer 18 and passed, one at a time, through the entry 32 of a sealing apparatus 24 and deposited in a cruciform-shaped recess in a rotatable box 101 with a ring-gear 90 which meshes with a gear 86 controlled by a one revolution clutch, not shown. As the carton enters the box 101 it actuates a micro-switch (120), Fig. 5, not shown, so that the ring gear 90 is rotated through 90 degrees, entry of the succeeding carton forcing the longitudinally reorientated carton between upper and lower pairs of endless conveyer belts 54, 56 which move it towards ploughs 124 which have fingers 128 which hold the overlapping side flaps 130, 132, having uncoated bonding areas, at each end of the carton closed against the ice cream. Movement of the carton to the left, Fig. 7, brings the minor and major flaps 20, 22 in contact respectively with ploughs 140, 144 which open them so that they project horizontally and bilaterally symmetrical from each side of the carton while the planar portion 140b of the plough slidingly contacts the overlapped side closure flaps 130, 132, and the major flap 22 moves under a foot-plate 144c to hold it horizontally open. The carton then moves along to adhesive application stations 38, 40 each of which comprises a pair of upper and lower rollers (172, 168), Fig. 10, not shown, which project through windows in a glue pot reservoir (162) in which they are drivingly accommodated and which have respectively one and two circumferential rows of spaced recesses to deposit corresponding numbers of rows of adhesive on the inside faces of the flaps 20, 22. The conveyer continues to transfer the carton to a closing position where the flaps 20, 22 are urged closed by intercepting ploughs 214, Fig. 8, as they ride down the tapered back end 210 of the plough 140. The conveyer then deposits the carton between compression plates (227, 229), Fig. 11,not shown, which press closed the carton ends until the adhesive has set. The sealed' carton is then forcibly discharged through an outlet 35 as the following carton is deposited in the compression station. In a modification, Figs. 12-14, not shown, the upper flap (230) is adapted to overlap the lower flap (232), the upper flap only being opened by a plough (238), to receive glue, while the lower flap is pressed by the plough-(238) against the carton, a glue pot with only a single roller being employed, if desired. Other means for applying bonding material to the ends of the carton such nozzles (252, 256), Fig. 15, not shown, are described. Each carton includes a bottom panel 59 and a lid 58 with a closure flap 58a having an elongated tear strip 58b.