EnvironmentallyConsciousDesignManufacturing.pptVIP

Environmentally Conscious Design Manufacturing Agenda Use of Selected Commodities Material in a Typical U.S. Automobile Flow of Plastics in an Automobile Fundamentals of Plastics Fundamentals of Plastics (cont.) Thermoplastics Thermoplastics: Applications Thermosets Thermosets: Applications Processing of Plastics Toxic Chemical Released by Industries Design Guideline Recycling of Plastics: Facts Recycling Technology Materials Compatibility Materials Compatibility Chart Materials Identification Plastics Identification System (ISO 1043-1) Categories of Plastics(The Society of Plastics Industry) Use of Plastics in Packaging Plastics Degradation Degradable Plastics Environmentally Conscious Design Manufacturing (ME592) Date: April 14, 2000 Slide:* Environmentally Conscious Design Manufacturing (ME592) Date: March 8, 2000 Slide:* Class 17: Plastics Prof. S. M. Pandit Use of Plastics Fundamentals of plastics Design guidelines Recycling and degradation of plastics Unit:kg Unit:kg Composition: polymer molecules and various additives General characteristics: lower density, strength, elastic modulus and thermal and electrical conductivity, and higher coefficient of thermal expansion Two major classes of polymers: Thermoplastics Thermosets Major molecular structure which determines the properties of the polymer linear branched cross-linked network. Additives fillers plasticizers colorants Definition: Type of polymer which softens and melts when heated but resolidified upon cooling Typical examples: Acrylics Nylons Polyethylene Polypropylene Polystyrene Recyclability Easy to recycle Source: Kalpakjian, S., “Manufacturing processes for engineering materials” Definition: Type of polymer which does not soften appreciably when heated. Typical examples: Epoxy Polyester Polyimides Recyclability Difficult or impossible to recycle Burned to recover a portion of their chemical bond energy Alkyds: Good electrical insul