Study on Pretreatment and Steaming Conditions of Digital Inkjet Printing on Cotton Fabric

Printed textiles have a long history, and they have been widely used in the fields of wearing fabrics, interior decoration fabrics and industrial fabrics, and have a profound impact on people's lives. The development of science and technology has driven the development of printing and dyeing technology. Taking paper printing technology as an inspiration, digital inkjet printing technology that integrates computer technology, white technology, software development and traditional printing and dyeing technology and other related technologies is gradually shown to the public. And more and more attention from all parties.

The digital printing process mainly includes continuous jetting and on-demand jetting. Compared with traditional printing, digital printing has very outstanding characteristics: ① The printing pattern has high fineness and rich colors. The sharp increase in the precision of digital printing has provided designers with a wealth of imagination, making the production of high-definition printed and dyed textiles possible. ② Flexible batch. It is suitable for the popular "small batch, multi-variety" production in the market. ③ Short production cycle. The pattern used for digital printing can be modified by the computer at will, which is convenient and fast, and the finished product can be obtained within 1 ~ 2h to meet the personalized needs of consumers to wear or decorate. ④The pollution degree is greatly reduced. Dropping on demand reduces colorants and colored wastewater, does not use powdered dyes, and has low noise. ⑤Small footprint. It can be printed in offices and homes [1-5].

1 test

1.l Materials and equipment

Fabric: Pure cotton bleached plain cloth (58tex × 58tex, 300 pieces / 10cm × 300 pieces / 10cm)
Dyes: reactive ink black, red, yellow (Hangzhou Honghua Digital Technology Co., Ltd.)
Drugs: sodium alginate, white dextrin, anhydrous sodium sulfate, sodium bicarbonate, sodium carbonate, urea (chemically pure), new alkaline agent ESS, alkali-resistant penetrant CP105 (industrial product)
Instruments: DK98 double-hole water bath (Yuyao Dongfang Electrical Instrument Factory), DV1 type digital display viscometer (Shanghai Qunchang Scientific Instrument Co., Ltd.), JMV505T vertical rolling mill (Beijing Textile Machinery Research Institute), digital inkjet Printing machine (Hangzhou Honghua Digital Technology Co., Ltd.), SW-12A color fastness test machine (Wuxi Textile Instrument Factory), computer color measurement and color matching system MINOLTACM-3600D (Italian 0RINTEX Dyeing Technology Co., Ltd.), Y571A Dyeing rubbing fastness tester (Zhejiang Wenzhou Textile Instrument Factory), Q-SUN sun fastness tester (Dongguan Dongming Instrument Co., Ltd.)

1.2 Test method

When reactive dye ink is used for digital inkjet printing, the fabric needs to be pretreated. The pretreatment working fluid is mainly composed of alkali, urea and sodium alginate. The fabric after pretreatment can be dried for inkjet printing. The fabric after inkjet printing needs to be steam fixed.

Pretreatment prescription /%
Sodium alginate 1.5
Urea 8
Na2SO44
Na2CO33

Process flow: pretreatment (liquid rate 70%) → drying (100 ℃) → spray printing → steaming (100 ℃ × 20min) → cold water washing (2 to 3 times) → hot water washing (50 ℃, 2 times) → Soaping → Cold water washing → air drying.

1.3 Test method

1.3.1K / S value determination

The K / S value of the printed fabric after steaming and water washing was measured with a computer color measurement and color matching system, as an indicator to measure the apparent color depth of the inkjet printed fabric.

1.3.2 Color fastness test

The rubbing fastness is tested according to GB / T3920-1997 "Textile color fastness test rubbing color fastness".
The soaping fastness is tested according to GB / T3921.1-1997 "Textile color fastness test: Washing color fastness: Test 1".
The light fastness is tested according to GB / T8427-1998 "Textile color fastness test: artificial light color fastness: xenon arc".

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