ABSTRACT
Riding comfort performance of automotive seating has become more and more important, and polyurethane flexible foam should have excellent vibration properties and high durability.
Recently, many studies on vibration properties of polyurethane foam have been reported. In general, it was thought that to have low peak transmissibility and to keep low hysteresis loss were contrary factors. However we have already developed new comfort polyurethane foam based on MDI technology, which shows not only low peak transmissibility but also low hysteresis loss, besides good fatigue properties.
In this study, a chain of MDI based foams including new comfort foams are evaluated by means of vibration test and compression test, and the effect of the physical and chemical structure of MDI foam on the vibration properties is discussed in order to clarify the mechanism. Especially the compatibility of low peak transmissibility and low hysteresis loss in new comfort MDI foam is focused on in view of visco-elastic properties.
