However, these materials are still less than desirable for some diaper applications, in terms of elongation, retractive
force and permanent set.
The new material is capable of achieving retractive
force values comparable to nylon 6,6, with the added benefit of lower overall shrinkage levels for better tire uniformity.
force - values were taken as the maximum of the retractive
The crossed fibers encircle the strand creating intermittent bond points, which lock the strand in place for better creep resistance and maximized retractive
The chains are then more constrained and less susceptible to retractive
"forces" until the crystals have melted.
Swelling will continue until the retractive
forces in the extended chains balance the forces tending to swell the network.
The latest developments for new elastic nonwoven hook tabs provide improved physical properties and unique retractive
forces to make sure that the diaper stays on the baby's body, where it belongs, and does not slide down when getting wet and heavy," Mr.
Curing - load corresponding to the cord retractive
force generated at 177 [degrees] C (typical curing temperature) is applied for 20 min.
forces per weight of elastic are necessary for these added elastic features as diapers get thinner and become more garment-like.
The combination of physical crosslinks and entanglements among the chains results in a rubbery network somewhat like a chemically crosslinked rubber and the retractive
force is entropic in nature.
This allows manufacturers to process Lycra XA at stretch levels from 200350% with essentially constant retractive
force on the leg of the wearer.