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【正文】 50100 2 person carrying 24 100250 Light equipment 18 250+ Heavy equipment handling 12+ Note: Palletized products may receive drops of up to six inches. Step 3 Calculate Cushion Requirements ? To determine the amount of functional cushioning material which will provide adequate protection for the packaged item. ? By functional cushioning material, we mean that portion of the design which directly supports the load and functions to absorb shock during impacts. Step 3 Calculate Cushion Requirements Determining Cushion Thickness 24 drop height, 25 drop average Step 3 Calculate Cushion Requirements Determining Static Loading Range 24 drop height, 25 drop average Step 3 Calculate Cushion Requirements Figure Typical dynamic cushioning curve Step 3 Calculate Cushion Requirements Using Dynamic Cushioning Curves (Figure ) An Overview ? Curves are generated by dropping a series of known weights onto a cushion sample from a specified height and measuring the amount of shock experienced by the weights as they impact the foam. ? In simple terms, this testing represents a product dropping on a cushion from a height likely to be encountered during shipment. ? The horizontal axis represents a range of static loadings that packaged items might apply to the cushioning material. The vertical axis represents the shock experienced as the cushion is impacted. Step 3 Calculate Cushion Requirements ? Curves are often presented for both first impact and multiple impact (average of drops 25) data. An Example ? [Given] An object to be packaged is a 10inch cube weighing 60 pounds with a fragility of 50 g39。s fragility level (50 g39。s or lower. ? The highest static loading value within the cushioning range will result in the most economical design because it will use less cushioning material to provide adequate protection, thus lowering design costs. Step 3 Calculate Cushion Requirements ? The cushion bearing area is easily calculated as the product weight divided by our chosen static loading. a) 60 / = 200 square inches of foam b) 60 / = 43 square inches of foam (This is a % reduction in cushioning material) ? Designing to the minimum thickness is the general practice. ? By repeating this procedure with several materials, you can quickly generate parisons, which will allow you to strike an economical balance between material cost and package size. Step 4 Recognizing Design Constraints 1. Consider Compressive Creep ? Compressive creep is the gradual loss of thickness a material may experience if placed under a constant load for an extended period of time. ? Significa
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