65、llecting and regenerating a packaging material for further use is a complex one for most materials,Waste Management and Environmental Issues,significant investment in sophisticated equipment. - While glass is apparently readily identifiable, individual glass compositions as well as different colors。

66、make it difficult to get uncontaminated feedstock. - Paper fiber quality deteriorates with every recycling, and so paper cannot be recycled indefinitely. - Plastic materials pose a number of serious recycling problems. The plastic industry developed a code for identifying the six most commonly used packaging plastics;
it includes an “other” selection as a seventh code (Figure 1.3,Waste Management and Environmental Issues,Figure 1.3 A code identifies the main packaging plastic families. PETE is u 。

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标题：包装|包装技术基础1( 五 )