Good performance of metal packaging materials surface decoration, high strength, convenient storage and transport prominent feature increasingly been the favorite of all the metal tank was originally used to wrap food, can be traced back to 200 prior to the Napoleonic era, two of today's metal three beverage cans has become one of the carbonated drinks, juices, beer and other packaging. A lot of beverage cans market Enteromorpha specifications, its lid they use pull ring easy open end, however, the current use of easy open ends have a defect in the structure.
A pull ring opening of the easy open end principle and classification
Easy open end and ring-pull for short pull-lid, this type of cover easy to open, the open could pull on the valve ring, tearing to open the lid a little harder. Ring pull the opening of the easy open end principle is: prefabricated indentation in the lids open at first to reduce its local intensity, a higher concentration of stress generated in the vicinity of the pull ring at the open, under the action of the shearing force, the indentation at cracking open. Normal circumstances cans inside and outside pressure difference is small, a shearing force generated by the indentation at small and uniform, the cans not self cracking, and to ensure the safety of the canned products in transport, storage process.
Pull ring lid has two forms: one is a small mouth small mouth style, pull ring pull can lid open, this small port can be sucked out pretty fluid contents, another big mouth style, pull ring pull when almost the entire lid is opened, in order to remove the contents from thick sticky solid, powder or height. Discuss small mouth easy open ends, this cover surgery wide application in beverage cans, small mouth style easy-open lid there are two: full tear-and full tear type. Both lids have their pros and cons.
2 bayonet easy open end characteristics of
Tear easy open end application a long time, the most widely applied in the current beverage cans. Full tear easy open end manufacturing processes mature, beautiful structure, stacking performance, reluctantly storage, transportation and display. However, full rip easy open end of the pull ring turned people carelessly throw away, causing environmental pollution and possible injury to others, this is a full tear easy open end weakness. Tear easy open end of this weakness, it designed non-full tear easy open end easy open end that is reserved style,
Preserving easy open end pull pull opening is not from the cover off, but was pushed into the tank, this structure avoids the pull ring and opening littering while wounding and pollute the environment, however, This structure also has a big loophole. Canned drinks during transportation, exhibition sales, and placed in the refrigerator into, as well as consumers to carry into the prone that the bacterial contamination of dust on the tank, which pushed into the tank opening part of the contact with the contents consumption The drinkers Health will not be protected.
In addition, these two kinds of lids, pull ring in the open is not very convenient, consumers have a peaceful experience in the open easy open Gellar ring, mainly by the finger means cover forced, this design does not meet the convenient to use the principles of humanity, from the ergonomic point of view, the best in the flap from the ring finger tip focus, fingertip focus on requirements the trap of contact pull the end of the ring have room for.
Easy open end optimization design
Summarizing the above analysis, the authors of the lids optimized design style as shown in Figure 3, for the optimized design structure diagram of the lid, the design principles of the design of the application and to retain the cover design principle similar to rivet as a fulcrum , the end of the pull ring is urging parts. The force is to the top of the geothermal resource ring top pressure down lid. The design and retention cover except that rivet hero image chip, so that when the pull up pull ring, rivets will be the upward force the tear sheet under the action of shear stress is instituted, tear the end of the sheet with the tank The cover is connected to the cable is connected. Avoided torn piece lids completely out of this design concept is for a complete full tear and retain the shortcomings of the lid, and its structure to avoid the pull ring is completely out of the lids caused by environmental pollution and wounding the possibility to solve the problem of consumers drink health can not be guaranteed. In addition, the attention of the design to the lid at the end of the pull ring groove than the original design and deep to lift the pull ring, so that consumers can end focus with the background rather than the cover.
4 Conclusion
Proposed optimized design considering the green, humane and processing factors. Although in recent years, the beverage packaging plastic and paper is widely used, but the application of metal cans, carbonated drinks and fruit juices, beer packaging is still very large, metal cans, packaging design should be greener, more humane, The only way to truly meet the needs of consumers.