Patent GB-170534-A (GB)
Title: Improvements in and relating to the treatment and purification of yarns and fabrics composed of vegetable fibres
IPC: D06F43/00
Filed: 1920-12-04
Abstract: Fabrics and yarns of vegetable fibres, such as cotton and linen, are purified by treatment in the dry or wet state with organic solvents having a boiling-point of 100 DEG  C. or over, either at normal pressure and at a temperature of 100 DEG  C. or over or at a modified pressure and correspondingly modified temperature, whereby wax, oil, fat, &c. are removed.  Wet goods may be treated in succession with the solvent vapours, then with the solvents, and finally with steam to remove the remaining solvent, which is recovered by known methods. The wax &c. dissolved out of the treated material is recovered from the washing-liquor by known methods.  Ammonia vapour may be introduced at any stage, and alkaline solution during steaming, to prevent damage to the goods.  Solvents such as toluene, xylene, tetrachlorethane, and high boiling-point solvent naptha or petroleum benzine may be used; or solvent mixtures containing basic solvents, such as pyridine, acid solvents, such as formic acid and phenols, and alcohols may be employed.  The goods may undergo known wet treatment, such as treatment with acids followed by washing, before the treatment described above with organic solvents, and such treatment may be used in conjunction with known methods of scouring, bleaching, and finishing.  The dry goods may be treated with xylene at 100 DEG C. in centrifugal apparatus, and wet goods may be treated with toluene vapour and toluene on the reflux system in a two-compartment extraction-chamber.ALSO:Fats, extracting by solvents.  Fabrics and yarns of vegetable fibres, such as cotton and linen, are purified by treatment in the dry or wet state with organic solvents having a boiling-point of 100 DEG  C. or over, either at normal pressure and at a temperature of 100 DEG  C. or over, or at a modified pressure and correspondingly modified temperature, whereby wax, oil, fat, &c. are removed.  Wet goods may be treated in succession with the solvent vapours, then with the solvents, and finally with steam to remove the remaining solvent, which is recovered by known methods.  The wax &c. dissolved out of the treated material is recovered from the washing-liquor by known methods.  Ammonia vapour may be introduced at any stage, and alkaline solution during steaming, to prevent damage to the goods.  Solvents such as toluene, xylene, tetrachlorethane, and high boiling-point solvent naptha or petroleum benzine may be used; or solvent mixtures containing basic solvents, such as pyridine, and solvents such as formic acid and phenols, and alocohols may be employed.  The goods may undergo known wet treatment, such as treatment with acids followed by washing, before the treatment described above with organic solvents, and such treatment may be used in conjunction with known methods of scouring, bleaching, and finishing.  The dry goods may be treated with xylene at 100 DEG  C. in centrifugal apparatus, and wet goods may be treated with toluene vapour and toluene on the reflux system in a two-compartment extraction-chamber.