Patent GB-1162540-A (GB)
Title: Carrier Bag.
Inventor: SCHWARZKOPF AUGUST
IPC: B31B19/86
Filed: 1966-10-31
Abstract: 1,162,540. Carrier bags. WINDMÍLLER & HÍLSCHER. 31 Oct., 1966, No. 48793/66. Heading A4G. A plastics carrier bag, Figs. 1, 2, has two U-shaped handles 6, 7 folded from flat strips such that the hand grip portions 12, 13 lie to one and the same side of their associated depending limbs whereby the hand grips 12, 13 may nest one within the other. The handles are welded at 8 to the inner (as shown) or outer (Figs. 3, 4) faces of the bag walls. The bag may have welded side seams 1 or bottom seams (14, Figs. 5-8) and optionally includes a bottom gusset 3, side gussets (15, 16, Figs. 5-8), or an infolded rim 4. Bags may be formed from an intermittently advanced web, comprising a flattened plastics tube 21, Figs. 9, 20, or a folded over strip (36, Fig. 11), defining upper and lower plies. In one bagforming apparatus, Figs. 9, 20, a tubular web 21 is drawn intermittently by a pair of rollers 60, 61 through a perforating station 64 which in the nest position of the web 21 produces a tear line 23 across the web 21. The plies pass on opposite sides of a mandrel 26 or 65 and optionally past a side gusset forming device (Fig. 21). Handles 19, 20 are successively positioned at a welding station 24, 25 to be secured to the respective lower and upper plies of the web 21 in the rest condition. The handles 19, 20 are cut at 771, 78<SP>1</SP> into strip form from rolls 73<SP>1</SP>, 74<SP>1</SP> and bent into U-shape as they are advanced to the welding station 24, 25. A further welding station 66 produces a seam weld across the leading end of the web which is to form the bottom of a bag. Immediately after stopping of the web 21, the preceding bag 67 is further advanced by pull-off rollers 68, 69 to separate the bag 67 with its attached handles from the web 21 at a tear line 23. The bags pass to a receiving table 72. In an alternative bag-forming apparatus (Fig. 11) the web comprises a folded over strip (36) and the handles (9) are welded to the overlying free edges of the strip (36), the web being subsequently cut transversely and seam welded to form a bag with side seams. The handles may be formed simultaneously as a nested pair (Figs. 13-16) and are secured to web in the nested condition. In a further bag-forming apparatus (Figs. 25, 26) a nested pair of handles are passed through a pair of slits (47, 48) formed in the upper ply only at a tear line. The handles are separated by a non weldable layer or are pretreated to prevent a welding together of the handles. In one form of apparatus, Fig. 22, for folding a handle strip 73 into U-shape, flaps 75, 76 are pivoted to a support plate 74 about axes 86, 87 and 84, 85 inclined at 45 degrees to the longitudinal axis of the strip 73 to fold the strip ends 88, 89 over the edges 82, 83 of bars 80, 81 which are pivoted in a block 79 to swing out of the folds when a bag is further advanced. In a further folding apparatus (Fig. 24) a central, strip-supporting plate (93) is lowered together with folding bars (98, 99) as the strip ends (94, 95) are folded over the bars (98, 99) by reciprocated tongues (103, 104). A further folding apparatus (Figs. 27-29) provides means for gripping a handle strip adjacent the points at which it is to be folded, the gripping means being simultaneously moved towards each other and rotated in the plane of the strip.