Flexible packaging current types

Products intermediate to the flexible and rigid foams may be obtained from castor oil (a trihydroxyl molecule), synthetic triols of moderate molecular weight and polyesters with a moderate amount of trifunctional hydroxyl compound in the strueture. Current practice, however, is to use tipped polyols of the type used for flexible foams with MDI. Semi-rigid foams are used for such purposes as crash pads, car steering wheels and packaging equipment. 

Numerical simulations play an increasingly important role in biological solid-state NMR spectroscopy. In this chapter, we describe some of the most important tools currently used for numerical simulations in solid-state NMR, including a brief theoretical section to provide the basic definitions. The most powerfid tools involve general computer software packages, enabling simulations of essentially all types of experiments with flexibility similar to that of a modern NMR spectrometer. Supplementary software includes programs that allow easy establishment of typical... 

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