| 摘要 |
PURPOSE: To efficiently carry out a flame-retardant treatment by introducing a cellulose-based woven fabric impregnated with a specific phosphorus-containing organic compound to a chamber sealed in an airtight state and treating the fabric with an ammonia-containing gas. CONSTITUTION: A cellulose-based woven fabric impregnated with a tetrakis(hydroxyorgano)phosphonium composition is introduced into a chamber equipped with an inclined roof 5 and an inlet 2 and an outlet 13 to be sealed in an airtight state. The woven fabric is brought into contact with a dust 3 at <60 degree contact angles while being traveled in a meandered state through plural rollers 4 installed in the chamber 1 an ammonia-containing gas is fed from an orifice of the duct 3 and the woven fabric is treated at a fixed temperature while recycling the gas. The woven fabric is withdrawn from the outlet 13, oxidized, neutralized/washed/dried. The cellulose-based woven fabric comprises <30 wt.% of cellulose fiber and <70 wt.% of polyester fiber. The gas contains ammonia of 70-90% initial concentration. |
