Described herein are apparatuses and methods for dyeing garments. An exemplary apparatus comprises a dye injection system configured to dispense concentrated liquid dye; a dyeing machine comprising a dyeing chamber configured for dyeing at least one garment in a dyebath; and a controller in communication with the dye injection system and the dyeing machine, wherein the controller is configured: to receive at least one garment parameter corresponding to the at least one garment; based at least in part on the at least one received garment parameter, cause the dye injection system to dispense a volume of concentrated liquid dye containing an amount of dyestuff that can be substantially absorbed by the at least one garment; and cause the dyeing machine to execute a dye cycle such that substantially all of the dyestuff in the dispensed concentrated liquid dye is absorbed by the at least one garment within the dyeing chamber.

The invention relates to a separation, recycling and self-cleaning system of a supercritical fluid dyeing machine. The system includes a supercritical fluid medium reservoir, one or more parallel dyeing units, a high-pressure pump, a primary separator, a secondary separator and a membrane separator sequentially connected. A dyeing medium and residual dye in dyeing units can be efficiently separated and recycled simultaneously, and when the separation and recycling is finished, each dyeing unit can be directly opened so that the dyeing units and products can be cleaned after dyeing, thereby improving the production and processing efficiency of supercritical fluid waterless dyeing and achieving simple operations, complete separation, stability and reliability and a blowback self-cleaning. The invention has a broad application prospect and practical significance in fundamentally addressing generation and emission of pollutants in the textile printing and dyeing industry and realizing energy conservation, consumption reduction, emission reduction and clean production.

Provided herein is a method of separating spandex from textile blends using biosolvents. The recovered material is of high purity while the chemical structure and molecular weight remain substantially unaffected by the treatment.

Provided herein is a method of separating spandex from textile blends using biosolvents. The recovered material is of high purity while the chemical structure and molecular weight remain substantially unaffected by the treatment.

A decolorization method of a polyester fabric, including the following steps, is provided. A first extraction treatment is performed on the polyester fabric using a recycled solvent, so that a first portion of a dye in the polyester fabric moves into the recycled solvent. A first filtering treatment is performed on the recycled solvent and the polyester fabric to obtain a treated polyester fabric. A second extraction treatment is performed on the treated polyester fabric using a fresh solvent, so that a second portion of the dye in the treated polyester fabric moves into the fresh solvent. A second filtering treatment is performed to obtain a decolored polyester fabric and the recycled solvent.

A decolorization method of a polyester fabric, including the following steps, is provided. A first extraction treatment is performed on the polyester fabric using a recycled solvent, so that a first portion of a dye in the polyester fabric moves into the recycled solvent. A first filtering treatment is performed on the recycled solvent and the polyester fabric to obtain a treated polyester fabric. A second extraction treatment is performed on the treated polyester fabric using a fresh solvent, so that a second portion of the dye in the treated polyester fabric moves into the fresh solvent. A second filtering treatment is performed to obtain a decolored polyester fabric and the recycled solvent.

In a process for recycling waste fabric comprising dyed polyester fibers or dyed cellulosic fibers, a polar solvent is flowed through the waste fabric in an extraction chamber to remove the dyes; the solvent is evaporated in an evaporation chamber and condensed to be sent to a solvent collection tank or back to the extraction chamber; any elastomeric material present in the waste textile is dissolved by the solvent during the treatment.

In a process for recycling waste fabric comprising dyed polyester fibers or dyed cellulosic fibers, a polar solvent is flowed through the waste fabric in an extraction chamber to remove the dyes; the solvent is evaporated in an evaporation chamber and condensed to be sent to a solvent collection tank or back to the extraction chamber; any elastomeric material present in the waste textile is dissolved by the solvent during the treatment.

A process and a system for washing filaments. A filament to be washed and a washing liquid are passed in a countercurrent. The process and the system include two washing stages. In each washing stage the filament is brought into contact with a fresh washing liquid by a washing element in such a way that only an amount of the washing liquid is transferred to the filament, which adheres to the filament itself, for example by adhesion. The washing liquid is then separated from the filament again in each washing stage, and a separated washing liquid is collected in such a way that it is not mixed with the separated washing liquid from other washing stages of the process but is used as the fresh washing liquid in the washing element of a preceding washing stage.

A process and a system for washing filaments. A filament to be washed and a washing liquid are passed in a countercurrent. The process and the system include two washing stages. In each washing stage the filament is brought into contact with a fresh washing liquid by a washing element in such a way that only an amount of the washing liquid is transferred to the filament, which adheres to the filament itself, for example by adhesion. The washing liquid is then separated from the filament again in each washing stage, and a separated washing liquid is collected in such a way that it is not mixed with the separated washing liquid from other washing stages of the process but is used as the fresh washing liquid in the washing element of a preceding washing stage.