ENVIRONMENTALLY CONSCIOUS DESIGN (ECD) PRIMER

EXAMPLES AND CASE STUDIES FOR ECD

Problem 1.
Sketch the general flow of material during the life cycle of a hypothetical product. Label each compartment and, to the best of your ability, the flow streams. Show where there is the potential for recycle or reuse.

Problem 2.
Recycling aluminum beverage cans generates a large fracton of recycled or post-consumer aluminum. In general, aluminum cans are recycled whole. Thus, the composite can composition is different than its components and can not be used directly to make any of the three pieces of a can (body, end, tab). For example, to produce can bodies from the composite aluminum, it will be necessary to add pure aluminum and manganese to create Alloy 3004. First, dtermine the composition of the composite aluminum from recycled cans. Then, determine the amount of composite and pure Al and Mn that would need to be combined to produce 1000 pounds of Alloy 3004.

 Item Aloy # Wt.% Mn Wt. % Mg Wt. (g) % Total Wt. Body 3004 1.2 1.0 11.62 74.8 End 5182 0.35 4.5 3.51 22.5 Tab 5042 0.35 3.5 0.42 2.7 Total 15.55 100

Problem 3.
a) Can bodies are made from sheet metal stock 0.0116 inches thick. Each body begins as a circular blank 5.7 inches in diameter, each blank punched from a sheet in a close-packed pattern. In this way, a strip 59.85 inches wide would give ten blanks across its width. Calculate the percent of home scrap in producing the can bodies.

b) Estimate the weight of aluminum sheet needed to produce one ton of can bodies.