Only part of the improvement in the wrinkle-recovery of wool fabric due to annealing remains after steam-pressing. The effects of annealing variables on the magnitude of this relatively stable improvement in wrinkle-recovery have been investigated. It depends on the annealing temperature and can be increased by . annealing in the absence of air or by heating the wool in water before annealing. These effects were additive, and the annealing conditions for optimizing the wrinkle-recovery after steam-pressing were established.
The viscoelastic behavior of annealed fabric specimens produced from wool and manmade fibers has been assessed by measuring the fabric bending stress relaxation characteristics. The study reveals that the presence of water provides an effective me dium for de-ageing of fabrics produced from both wool and manmade fibers. Optimum annealing conditions occur when these fabrics are heated below the glass transition temperature of each fiber type at the equilibrium moisture regain corresponding to 20°C, 65% RH (the time taken depending on the annealing temperature). Under these conditions, the fabric bending stress relaxation rate is reduced to its minimum value, thus resulting in maximum fabric recovery from bending or wrinkling. The application of horizontal and vertical shift factors produces a master stress relaxation curve of aged and annealed fabric specimens produced from both wool and manmade fibers.
A 75-year-old woman suffered severe haemoptysis after insertion of a Swan-Ganz catheter in an intensive care unit. Control of the pulmonary artery haemorrhage was quickly and successfully achieved with stainless steel coils as the embolic material.