The invention provides a method for modifying cotton and long vegetable
fiber or
yarn by
ammonia liquid, which comprises the following steps: firstly,
drying pre-treatment of raw materials; secondly,
ammonia leaching of the raw materials in a hermetical treatment tank; thirdly, spin-
drying of the raw materials subjected to
ammonia leaching when a creel is twirled; fourthly,
drying of the raw materials subjected to spin-drying by ammonia flow when the creel rotates slowly; fifthly, flushing of the raw materials which are dried by the ammonia flow by
airflow when the creel rotates slowly; and so on. The method keeps the inherent advantages of the cotton, the long vegetable
fiber and the
yarn, overcomes the defects of the cotton, the long vegetable
fiber and the
yarn, increases softness,
crimp tendency and fluffiness of the cotton, the long vegetable fiber and the yarn, improves the dye-
uptake rate, the leveling property and the showy dye level, and further solves the problems of
energy conservation, efficiency improvement and
environmental protection.