Separated plastics, processing

Molecular hydrogen, 23 759 Molecular imprinting, 6 397 Molecular interactions, 25 103 Molecular interaction theories, 24 38 Molecular Laser Isotope Separation (MLIS) process, 25 416 417 Molecular level machine, 2 7 58 Molecularly imprinted plastics (MIPs) smart, 22 717)... 

Plastics processing, 19 536-563 extrusion, 19 539-549 molding, 19 549-556 thermoplastic resins, 19 536, 537-539 thermosetting resins, 19 556-559 Plastics recycling, 21 372, 446-461 economics of, 21 457-459 impurity separation in, 21 448 materials separation in, 21 447-448 recent developments in, 21 456-457 types of plastics in, 21 449-457 Plastics recycling industry, U.S., 21 458-459... 

Solvent-based recycling processes can separate plastics from other types of waste by selective dissolution. In particular, polymers of different chemical constitution can be separated and also blends of polymers (129). 

Screening Used to separate solid waste components by Trommels and horizontal and vibrating screens for unprocessed and processed wastes disk screens with processed wastes Optical sorting Used to separate plastics... 

Originally (inheriting the practice from the rubber industry a century ago), the plastics processing sector has purchased resins and additives separately and mixed its own compounds. However, the growing sophistication of compoimds (especially reinforced materials), together with the need for special investment in separate handling of additives and market demand for reproducible performance, have created a specialist industry sector that is devoted to the production of compounds. This has occurred mainly in TPs but the use of ready-made compounds is growing rapidly in TSs. 

Contamination of one resin with another can also result in diminished performance. One of the most fundamental problems is that most polymers are mutually insoluble. Thus, a blend of resins is likely to consist, on a microscopic scale, of domains of one resin embedded in a matrix of the other resin. While this sometimes results in desirable properties, more often it does not. To further complicate matters, the actual morphology, and thus the performance, will be strongly dependent not only on the composition of the material but also on the processing conditions. Therefore, for most high-value applications, it is essential to separate plastics by resin type. 

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