| 摘要 |
1,141,016. Sheet forming. DEERING MILLIKEN RESEARCH CORP. 1 April, 1966 [9 April, 1965], No. 14628/66. Headings B5A and B5N. [Also in Division D1] Woven or knitted cellulosic fabrics are rendered amenable to deformation by treating them while in a relaxed state with liquid ammonia to render the cellulosic material amorphous as indicated by X-ray diffraction. The liquid ammonia is preferably maintained at -60‹ to -30‹ C. and treatment may be for from one second to five minutes, the treated fabric then being deformed into the desired shape if desired after drying under substantially water-free conditions, e.g. in a drying oven or at room temperature. The fabric may be made from cotton viscose rayon or paper yarn. The stability of the amorphous structure may be increased by dissolving a bond inhibitor in the liquid ammonia, suitable bond inhibitors being polyhydric alcohols containing 2-6 carbon atoms or mixtures thereof e.g. ethylene glycol, propylene glycol, glycerine, diethanolamine, triethanolamine, trimethylene glycol, tetramethylene glycol, butane triol, pentane triol, diethylene glycol, dipropylene glycol and triethylene glycol, and phenol formaldehyde, melamine formaldehyde or urea formaldehyde polymers; dimethyl ethylene urea, dihydroxy dimethylol ethylene urea, polyvinyl alcohol, polyethylene glycol. polyacrylic acid, polyvinyl acetate, the sodium salt of a styrene-maleic anhydride copolymer and end blocked isocyanate containing polymers. The treated fabrics may be laminated with vinyl films and moulded. |
