The present invention discloses a multifunctional dyeing and finishing kettle and a production-type supercritical CO.sub.2 fluid anhydrous dyeing and finishing apparatus with a scale over 1000 liters. The production-type supercritical CO.sub.2 fluid anhydrous dyeing and finishing apparatus mainly comprises a CO.sub.2 low-temperature storage tank, a CO.sub.2 supply storage tank, a low-temperature transfer pump, an ethylene glycol head tank, an ethylene glycol pump, a water cooling tower, a water pump, a refrigeration unit, a condenser, a heat exchanger, a heat transfer oil system, a heat transfer oil replenishment system, a precooler, a CO.sub.2 boost pump, a dye kettle, a feeder, a multifunctional dyeing and finishing kettle, a CO.sub.2 circulation pump, a cooler, a separation kettle, an adsorber and a recovery compressor, an on-line monitoring system and an automatic control system. The apparatus is capable of meeting single-color or multi-color dyeing and finishing production of a plurality of textiles.

An system for anhydrous boiling, bleaching and dyeing using a supercritical carbon dioxide fluid and belongs to the field of textile. The system for anhydrous boiling, bleaching and dyeing of a supercritical carbon dioxide fluid provided by the present invention is provided with a co-solvent system, a boiling, bleaching and dyeing system, and a separation and recovery system which are specially designed. By means of uniform dispersion and dissolution of a co-solvent, dyestuff and carbon dioxide, boiling, bleaching and dyeing production of jute fiber rough yarn can be achieved; meanwhile, the system for anhydrous boiling, bleaching and dyeing using a supercritical carbon dioxide fluid integrates the three functions of boiling, bleaching and dyeing, which can complete the boiling, bleaching and dyeing procedures in one step, and has the characteristic of high-efficiency, thus solving the problems of high contamination and high energy consumption of the jute fiber boiling, bleaching and dyeing procedures.

An system for anhydrous boiling, bleaching and dyeing using a supercritical carbon dioxide fluid and belongs to the field of textile. The system for anhydrous boiling, bleaching and dyeing of a supercritical carbon dioxide fluid provided by the present invention is provided with a co-solvent system, a boiling, bleaching and dyeing system, and a separation and recovery system which are specially designed. By means of uniform dispersion and dissolution of a co-solvent, dyestuff and carbon dioxide, boiling, bleaching and dyeing production of jute fiber rough yarn can be achieved; meanwhile, the system for anhydrous boiling, bleaching and dyeing using a supercritical carbon dioxide fluid integrates the three functions of boiling, bleaching and dyeing, which can complete the boiling, bleaching and dyeing procedures in one step, and has the characteristic of high-efficiency, thus solving the problems of high contamination and high energy consumption of the jute fiber boiling, bleaching and dyeing procedures.

A method for decolorization of a dyed polyester fiber is provided. The method for decolorization of a dyed polyester fiber includes step of: providing an ether-alcohol solvent and a polyester fiber containing a dye; heating the ether-alcohol solvent up to a boiling point of the ether-alcohol solvent to continuingly generate a fresh gas; wherein a temperature of the fresh gas ranges from 90 C. to 200 C. which is between a glass transition temperature of the polyester fiber and a melting point of the polyester fiber; extracting the dye from the polyester fiber via the fresh gas and forming an extracting condensate containing the dye; reflowing the extracting condensate back into the ether-alcohol solvent; repeating the steps mentioned above to obtain a decolorized polyester fiber.

A method for decolorization of a dyed polyester fiber is provided. The method for decolorization of a dyed polyester fiber includes step of: providing an ether-alcohol solvent and a polyester fiber containing a dye; heating the ether-alcohol solvent up to a boiling point of the ether-alcohol solvent to continuingly generate a fresh gas; wherein a temperature of the fresh gas ranges from 90 C. to 200 C. which is between a glass transition temperature of the polyester fiber and a melting point of the polyester fiber; extracting the dye from the polyester fiber via the fresh gas and forming an extracting condensate containing the dye; reflowing the extracting condensate back into the ether-alcohol solvent; repeating the steps mentioned above to obtain a decolorized polyester fiber.

A supercritical fluid dyeing and finishing system has a fabric warp beam dyeing kettle. A fabric warp beam dyeing and finishing unit is arranged in the fabric warp beam dyeing kettle. An external magnetic transmission device II is arranged outside the fabric warp beam dyeing kettle. The fabric warp beam dyeing and finishing unit includes a porous pipe I and a porous pipe II. The porous pipe I and the porous pipe II are connected with an inlet of the fabric warp beam dyeing and finishing unit through a bearing I and a bearing II. A fluid ejector is connected with the inlet of the fabric warp beam dyeing and finishing unit and disposed in the vicinity of the porous pipe I and the porous pipe II.

A supercritical fluid dyeing and finishing system has a fabric warp beam dyeing kettle. A fabric warp beam dyeing and finishing unit is arranged in the fabric warp beam dyeing kettle. An external magnetic transmission device II is arranged outside the fabric warp beam dyeing kettle. The fabric warp beam dyeing and finishing unit includes a porous pipe I and a porous pipe II. The porous pipe I and the porous pipe II are connected with an inlet of the fabric warp beam dyeing and finishing unit through a bearing I and a bearing II. A fluid ejector is connected with the inlet of the fabric warp beam dyeing and finishing unit and disposed in the vicinity of the porous pipe I and the porous pipe II.

A method for treating textile material (13) to attach dyes, such as synthetic or natural dyes, or to apply bleaches to said textile material (13). The method provides a first step of pre-impregnation of the textile material (13) with an impregnation liquid and a second step of heating the impregnation liquid and the possible dyes or bleaches, through contact of said textile material (13) with at least one heated drum (20), and subsequent vaporization of said impregnation liquid, said textile material (13) being selectively movable on said heated drum (20), subjected to an adjustable pressure higher than atmospheric pressure, a strip (18) being present and exerting on said textile material (13) an adjustable pressure against the heated drum (20).

A method for treating textile material (13) to attach dyes, such as synthetic or natural dyes, or to apply bleaches to said textile material (13). The method provides a first step of pre-impregnation of the textile material (13) with an impregnation liquid and a second step of heating the impregnation liquid and the possible dyes or bleaches, through contact of said textile material (13) with at least one heated drum (20), and subsequent vaporization of said impregnation liquid, said textile material (13) being selectively movable on said heated drum (20), subjected to an adjustable pressure higher than atmospheric pressure, a strip (18) being present and exerting on said textile material (13) an adjustable pressure against the heated drum (20).

An embodiment herein provides a process for dyeing of textile materials 108 with supercritical fluid. One or more dye materials 102 along with additives (if required) are mixed with at least one suitable solvent 104 to obtain one or more dye solutions 106. A textile material 108 is pre-treated with the one or more dye solutions 106 to obtain a dye coated textile material 110. The dye-coated textile material 110 is exposed to the supercritical fluid 112 in a supercritical fluid dyeing vessel at controlled pressure and temperature. The supercritical fluid 112 solubilizes and diffuses the one or more dye materials 102 inside the surface, pores and capillaries of the textile material 108. The supercritical fluid vessel is then depressurized below supercritical condition to entrap the one or more dye materials 102 in the textile material 108 to obtain a supercritical fluid dyed textile material 114.