| Textile digital printing is a new printing technology which uses special inkjet printing machine to print designed digital drawings on textiles.Comparing with traditional printing process,the digital printing process has been greatly simplified and the work efficiency has been greatly improved.In addition,the digital printing is an efficient and clean production process because it avoids the risk of dyes waste and water consume and overcomes the shortcomings of traditional printing,such as high energy consumption and high pollution.The direct application on silk fabrics for digital printing often results in infiltration,which makes the outline of the pattern unclear and limits its further application;so the fabric must be pretreated first,so that the surface of the fabric can be evenly covered with a layer of paste to improving the infiltration of digital printing of silk fabrics.However,the paste film will directly affect a series of quality indicators such as uniformity of dyeing,fineness of pattern,brightness of color,penetration effect and handle of jet-printed fabrics.Therefore,the purpose of this project is to study the digital printing pretreatment of silk fabrics,and analyze the effect of digital printing of silk fabrics by combined with the basic properties of pretreatment paste,to further improve the quality of silk digital printing fabric,enhance the added value of products,improve economic efficiency and expand the market of silk printed textiles.Scope,product development and market-oriented,industrialized.In order to achieve this idea and goal,this paper focuses on the research of silk digital printing pretreatment paste and its influence on the printing performance of digital inkjet printing.Aiming at digital printing of silk fabrics,eight kinds of pastes were selected in this paper:sodium alginate,DGT-6,Pink,ARJ,M-PL-1,euchrome 286,DITPRINT DF LEE and DITPRINT DF LAX.The basic properties,sizing effect and the effect of these pastes on the printing effect of digital inkjet pretreatment of silk fabrics were discussed respectively.The results are as follows:(1)The experimental results show that the 8 kinds of original paste belong to pseudoplastic fluid.Pink paste has good performance in viscosity,degumming rate and storage stability because of several other sizing pastes.At the same time,sodium alginate showed poor storage stability.(2)The strength,handle and whiteness of pretreated fabrics with 8 kinds of pastes are lower than those of untreated ones.Pink,euchrome 286,DITPRINT DF LAX three kinds of pastes in the hand feel,whiteness decreased lower,and increased strength.In particular,Pink paste is better and suitable for pretreatment of silk fabrics with digital printing.(3)Printing fine pattern Pink,M-PL-1 and excellent pigment 286 is not suitable for printing products with good penetrability.Pink and excellent pigment 286 show better performance in degree of permeability and color fastness.Based on the monochromatic data,sodium alginate and Pink are the best permeable paste for silk fabric printing.(4)Urea can absorb water vapor in the process of steam fixation,which increases the amount of condensation water on the fiber surface,and makes the fabric get better wetting and swelling.The experiment showed that the amount of urea was increased and the leveling property was improved.Too much urea will reduce the surface color.And with the increase of urea dosage,the infiltration of sample has been intensified.In the low alkali condition,the surface color of the fabric is lower,and when the alkali content reaches 2%,the color yield is higher and the outline clarity is better.With the increase of alkali dosage,the surface alkalinity of fabrics gradually strengthens,which can quickly enhance the reaction degree between hydroxyl ionization and reactive dyes,so as to increase the color yield;while excessive alkali dosage will cause the hydrolysis of dyes on the fabric surface and reduce the color yield.It also has a great influence on yellow and black dyes. |
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