The quench rates (i.e. rates of cooling) during thermal bonding of heterohesive web systems were studied. Quench rates were varied over several orders of magnitude and are shown to be an important factor in web strength. Initially web strength increases with increasing quench rate, reaching a maximum which is followed by a decrease in web strength at extremely high rates, probably reflecting frozen-in stresses. These studies of heterohesive systems extend earlier studies on webs and complement studies of model crossed fiber systems.
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