Study On Imitation-old Fast Dyeing Process Of Woolen Sweater

The subject hereby is to dye fast of woolen knits, and deal with resist agent process in order to achieve a style of imitation old appearance. To avoid rubbing and rolling during the processing, the subject mainly focuses on the physical and chemical characteristics of wool fiber. By reforming the conventional dyeing process, using fast dyeing method to realize the ancient effect and finally make up the process of imitation-old fast dyeing good for wool sweater garment dyeing technology. The imitation old of rapid dyeing will give woolen knit a new kind of wearing style which is a new appearance form for sweater. The style can satisfy consumers’requirements in the dress process of wool fabric, improve the added value of woolen sweater and fill the blank in the field of imitation of the old wool products.Woolen sweater fast dyeing process is through the reasonable selection of dyes and dyeing auxiliaries, shorten dyeing time, reduced dyeing temperature on dyeing wool knit. Fast dyeing will shallow the wool color to become the imitation of old effect of opaque dyeing and uneven dyeing. Compared with the traditional dyeing process, the dyeing time will be shorten for 30%～50%. The subject make up the final fast dyeing process is using 2～4%(owf) leveling agent preconditioning woolen sweater product in boiling water bath for 20 min. Without cold water washing and drying, wool knit is directly transferred to dye solution. The process’ initial dyeing temperature at 50℃, and the final temperature is 60-80℃. The heating rate of fast dyeing is 1～3℃/min, and after dye process need no time to heat preservation. Fix dyed color with solid color fixing agent Y at 70～80℃ for 10 min.The effect of imitate-old in rapid dyeing process can also be done by resist agent. Application for resist agent will appear the style different from simple rapid dyeing effect of the imitation ancient, and make strong feeling of efflorescence copy after the old. This topic chooses the reserving agent including Evo wax, fixing agent Y and sulfamic acid. Evo wax and sulfamic acid work on woolen knitted fabric by pretreatment. In view of influence factor such as temperature、time、pH, dye imitative-old after pretreatment. Based on the contrasting the effect of dyed, select the best pretreatment process. There is a theory for Cationic fixing agent Y cannot be used with weak acid dye bath which the subject on the basis of dyeing imitative old. Joining fixing agent Y in the conventional and rapid dyeing bath can realize dyed imitation of the old, and the imitation of the old style with conventional dyeing or fast dyeing is different.Imitative-old woolen sweater is a brand new field in wool spinning and weaving engineering, without the relative standards for reference. Therefore, the subject divides the imitative-old effect into five grades grading standard, according to the wool knit different old degree after rapid dyeing, and draws up the imitation of the old rating sample card.