Patent GB-1475361-A (GB)
Title: Wrapping consisting of a rigid outer supporting casing and an inner container of flexible material
IPC: B65D5/56
Filed: 1974-09-17
Abstract: 1475361 Packages; lined cartons with valves PLATMANUFAKTUR AB 17 Sept 1974 [18 Sept 1973 (2)] 40495/74 Headings B8C B8P and B8K A wrapping comprises a rigid outer casing 6 made of, e.g. pasteboard, carboard, plastics, or metal and having an opening in one side bounded by a rim, a cover connected to, or adapted to be assembled with, the outer casing being movable into and out of a position covering the opening and arranged, in the covering position thereof, to be in sealing relation with said rim, an inner container 1, made of flexible material, e.g. plastics, paper, or metal, and having a shape substantially conforming to the inner shape of the easing, the inner container 1 including- a surface portion 5 substantially parallel to the side of the easing including the opening and in registry with the opening, and fastening means fastening the inner container at said surface portion to an inner surface of the casing along a line adjacent to the opening in the easing whereby said surface portion of the inner container extends across said opening. As shown, a fiveply film, with a centre layer of polyvinylidene chloride, outer layers of polyethylene, and intermediate layers of ethylene vinyl acetate, having a thickness between 50 and 200 microns, and which is impermeable to the outer atmosphere, is formed into a tube by a weld 2, is filled with a material such as sugar, coffee, tea, &c., and is compressed, or vacuumized. The tube, which may be extruded, is closed at both ends by flaps to form a cubic shape and may be filled with an inert gas or, with a product that emits gas. One-way ribbon valves, capable of releasing gas from the container 1 may be formed at the seams and the flaps of the container, and can be formed to create pockets 56, 58, Fig. 28, to trap particles entrained by the emitting gases. A one-way ribbon valve, Figs. 26, 27, comprises a central member 35 between two layers of film 33, 34 welded together at their outer edges. Such a valve arrangement is incorporated at 41, 42 in the double-layer flaps, such as 51 of an inner container 1, Fig. 28, at welds 50, 55 with a central member 40 which may be common to both flaps (51, 52), Fig. 29, not shown. The container 1 is of a shape and size to fit snugly into the outer rigid support casing 6, and has a smooth upper rectangular surface 5 the periphery of which is secured to the inner wall of the casing to form a stable top wall of the package. The inner container 1 can be readily torn from the outer casing 6, for separate recycling, when the package is empty. A cover 25 for the casing 6, Fig. 18, is hinged to a frame 26 which has a peripheral groove 27 which fits over, and is glued to the upper rim of the casing 6. In a modification, Fig. 3, the outer edge of the surface 5 of the inner container 1 is fastened, at 10, Fig. 9, to the underside of a peripheral edging strip 7 on the outer casing 6. The package, Fig. 3, may have closure flaps 29-31, Figs. 21-22, and a cover 28 provided with a raised peripheral rib, and centre portions. The package, Fig. 3, may be closed by a hinged cover 8, Fig. 6, the contents of the container 1 being accessible by making a cut with a knife 9 along the outer periphery of the upper wall 5. The edging strip 7 may be formed by notching and folding in the wall of the outer casing 6<SP>11</SP> at 12, 13, Fig. 9, the casing having four cover flaps 15-17 and being formed from a blank, Fig. 11. The smooth upper surface 5 is covered with a rigid top wall 19 of the casing 6<SP>111</SP> having a cutoff cover 20, Fig. 12, the outer casing 6<SP>111</SP> being closable by a separate cover 21 which has a corresponding cut-off corner 60. The casing 6<SP>111</SP> can be closed by fitting the cover 21 so that the corners 20 and 60 do not coincide. A separate cover 22, Fig. 16, with an upwardly-directed peripheral wall is secured by a a band 23 which acts as a releasable fastener at one end and a hinge at the other.