Method of bleaching and providing papermaking fibers with durable curl

摘要: A process for bleaching high bulk cellulosic fiber and producing a durable elevated curl index includes: (a) concurrently bleaching, heat treating convolving pulp at temperature pressure consistency generally under conditions selected so as to preclude substantial fibrillation attendant paper strength bonding development; (b) recovering the wherein length weighted of treated is least about 20% higher than prior treatment thereof. Preferably, imparted persists upon 30 minutes in laboratory disintegrator 3000 rpm 1% 125° F. Moreover, may be disk refiner very short residence times, on order several seconds or less. In general, carried out presence saturated steam from 5 150 psig.