| 摘要 |
1,273,232. Stackable containers. IMPERIAL CHEMICAL INDUSTRIES Ltd. and FLOUR MILLING & BAKING RESEARCH ASSOCIATION. 13 March, 1970 [1 April, 1969], No. 17033/69. Headings B8C, B8D and B8P. The shelf life of foodstuffs is prolonged by storing under N 2 and/or CO 2 in stacked containers e.g. A-G provided with perforated bases 4 and gas sealing rings e.g. 5G. For stacking, each container is provided with a tongue e.g. 2A and complementary groove e.g. 3G positioned on either the top and bottom of the wall(s) or vice versa, each groove being provided with a ring. The top and bottom of a stack is sealed with caps 17, 24 which interengage with appropriate container tongues or grooves. The preserving atmosphere may be provided by pressurized CO 2 gas or solid CO 2 contained in a metal or thermo-plastics cage 21 having flanges 23 which snap fit into recessed cap ribs 19 on a top or, bottom cap. The container wall(s) may be tapered at their upper ends and provided with a skirt (7, Fig. 2) at the lower ends and the end caps (Fig. 3) are then provided with two peripheral grooves (10, 11, Fig. 3) for fitting on either the top or bottom of a container. The containers are formed of thermo-plastic material which may be foamed e.g. polymers and copolymers of ethylene, propylene, styrene, vinyl chloride and the rings are formed of a flexible, foamed material e.g. foamed rubber, polyether, polyurethane. The containers may be held together by straps e.g. of polypropylene passing through container channels or slots. |
