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Metal packaging materials surface decoration performance, high strength, easy storage and transportation and other salient features, has been increasingly loved by the public, metal cans were originally used to package food, dating back to the earliest Napoleonic era 200, today's metal two , Three beverage cans have become one of the main forms of packaging for carbonated drinks, juices, beers and more. At present, there are many beverage can specifications on the market. Most of them adopt pull-ring type easy-open caps. However, the existing easy-open caps have structural defects.
1, Pull the ring easy to open the lid open principle and classification
Pull-ring easy to open the lid referred to as the open can lid, this type of lid open convenient, as long as the pull open the valve ring on it, a little hard tearing to open the lid. Pull the ring easy to open the lid of the opening principle is: first in the lid open pre-indentation, reducing its local strength, open when the pull ring in the vicinity of more concentrated stress, the role of shear force is indentation Cracked and opened. In general, the pressure difference between the inside and outside of the tank is small, and the shearing force generated at the indentation is small and uniform. The tank will not crack on its own, which ensures the safety of the canned product during transportation and storage.
Pull the ring easy to cover in two forms: a we are small mouth, pulling the lid open a small mouth, which can be sucked out of the small mouth or pour fluid contents, the other is a large mouth, pull the pull ring Almost the entire lid has been peeled off to remove solid, powdery or highly viscous contents. The article mainly discusses the small mouth easy to open the lid, this cover in the beverage cans wide application, at present, there are two kinds of small mouth easy to open the lid: all tear and not all tear. Two kinds of cans have their own advantages and disadvantages.
2, small mouth easy to open the lid of the characteristics of analysis
Full tear easy to open the lid for a long time, the most widely used in the current beverage cans. The style shown in Figure 1. Full tear easy to open the lid manufacturing process is mature, beautiful structure, stacking performance, reluctantly storage and transportation. However, the fully torn open-lid pull-tab will be thrown away when it is opened, causing environmental pollution and potentially injuring others. This is a weak point of a full-torn open lid. In view of this weakness of full tearing and easy opening, people designed a non-full tearing easy-open lid that is a retention type easy-open lid, as shown in FIG. 2
The retention type easy-open lid does not come off the lid but is pushed into the can when the pull ring is pulled up. This structure avoids the problem that the pull ring and the opening are injured and pollute the environment due to littering. However, This structure also has a lot of loopholes. Canned beverages in transit, display sales and into the refrigerator into the refrigerator, as well as consumers are vulnerable to bacterial contamination of the tank into the tank, so pushed into the opening part of the tank after contact with the contents of the consumption Who can not get the drinking health protection.
In addition, the above two kinds of can lid pull ring when the opening is not very convenient, consumers have a peaceful experience that is open when the easy to open the lid pull ring, mainly by the fingers of the finger force, this design does not meet Convenient to use the principle of humanity, from the ergonomic point of view, when the flap valve ring refers to the end of the best, refers to the end of the pull force required pull the end of the ring there is room for contact.
3, easy to open the lid of the optimal design
Based on the above analysis, the author optimized the design of the lid, the style shown in Figure 3, for the optimal design of the lid structure, the design of the design principle and the design principle of the retention lid are similar, are based on rivets as the fulcrum , Pull the end of the ring is the force of the site. Applying force is the top of geothermal resources will be pressed down the top of the lid. The difference between this design and the retention cover is that the rivets are on the heroine piece so that when the tab is pulled the rivet is subjected to an upward force and the tear piece is lifted by the shear stress and the tip of the tear piece engages the can Cover connected to the cable. This avoids complete separation of the tear tabs from the lid, a design concept that addresses the shortcomings of both full tear and retention can ends, avoiding the environmental pollution and wounding caused by the pull ring being completely detached from the lid The possibility of consumer health and also solve the problem of access to health can not be guaranteed. In addition, the design notices that the groove of the lid at the end of the tab is deeper and deeper than the original design, so that the consumer can end up with the background rather than finger-cover when lifting the tab.
The optimal design proposed in this paper considers the factors of greening, humanization and processing technology. Although the application of plastic and paper for beverage packaging has been very extensive in recent years, the application amount of metal cans in the packaging of carbonated drinks, fruit juices, beers and the like is still very large. The design of metal cans packaging should be more greener and more humane. Only in this way can truly meet the needs of consumers.
Copyright：Shandong Xuyuan Packing Products Co., Ltd.