lesson15(文件)
【正文】 unter (“drop height”). 3. Calculate Cushion Requirements Use dynamic cushioning curves to determine thickness, static loading and bearing area. Introduction 4. Recognizing Design Constraints Check for important problems including pressive creep, cushion buckling and extreme temperature effects. 5. Design Prototypes and Test Build a prototype and determine its actual performance. 6. Consider Vibration Effects Determine the natural frequency of any ponent which is prone to vibration damage, and pare it against the vibration characteristics of your package design. Introduction 7. Monitor Performance Monitor the performance of your design to determine when internal changes in the design might alter the requirements for package performance. ( Another way for cushion design: Five steps for package cushion design ) 動(dòng)畫(huà) Step 1 Determine Product Fragility ? Fragility is normally expressed in units of “g’s” and indicates the maximum deceleration the product can withstand without being damaged. The more fragile a product is, the lower its gfactor（ Table ） . Step 1 Determine Product Fragility Table Approximate fragility of typical packaged Articles Extremely Fragile Aircraft altimeters, gyroscopes, items with delicate mechanical alignments Very Delicate Medical diagnostic apparatus, Xray equipment Delicate Display terminals, printers, test instruments, hard disk drives Moderately Delicate Stereos and television receivers, floppy disk drives Moderately Rugged Major appliances, furniture Rugged Table saws, sewing machines, machine tools 1525 g39。s 6085 g39。s. ? [Solution] 1. Since a product typically faces repeated impacts during shipment, you will probably wish to use multipleimpact data. typical drop height for a product of this weight may be estimated from the chart below as 24 inches. Step 3 Calculate Cushion Requirements 3. Obtain the cushioning curves for the cushioning material you wish to use. Locate curves that represent multiple impact data from a drop height of 24 inches. 4. Determining Thickness ? locate our product39。s assume you plan to use a 3inch thick pad of ETHAFOAM 220 to cushion a side of your
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