Process for jet dyeing fibrous articles containing polyester-type synthetic fibers

Claim 1

In a jet dyeing process for dyeing fibrous articles containing polyester-type synthetic fibers by adding a jet of a dye liquor to a liquid bath containing a fibrous article moving therein, the improvement which comprises, a. moving the fibrous article in a liquid bath in a dyeing tank at a rate, relative to said dyeing tank, of 80 to 300 meters per minute while the liquid bath is at a temperature of no more than 80°C. and does not contain any dye, b. elevating the temperature of the liquid bath in the dyeing tank to at least 110°C., while the fibrous article is moving therein, and c. adding a dye liquor containing dye in an amount of 1 gram per liter to 100 grams per liter to said liquid bath at a rate of not more than 20 liters per second after the temperature of said liquid bath reaches at least 100°C. to form a dye bath in said dyeing tank of at least 110°C., said dye bath having a dye concentration of 0.001 to 5% based on the weight of the fibrous article in said dye bath, while continuing to move said fibrous article in said dye bath at said rate of 80 to 300 meters per minute, relative to said dyeing tank until said fibrous article is dyed.