| Luxurious patterned PET packing materials on both conventional weaving fabric and non-woven fabric are emerging for the decorative and protective purposes.Digital ink-jet printing is an effective method in making patterns on fabric.However,there are lots of problems such as poor color yield,poor adhesion,and poor resolution etc.to digital ink-jet printing of PET fabric.All these are because of hydrophobic nature and smooth surface of PET fiber.Therefore,it is necessary to study some pretreatments before going to printing on PET fabric.In terms of digital ink-jet printing of textiles,plasma as a dry pretreatment is an environmentally friendly treatment in making PET fiber to a hydrophilic nature and rougher surface.In this research,two kinds of PET fabric have been used to improve the digital ink-jet printing properties.One is 100%polyester plain weave fabric,and another is PET non-woven fabric.For PET plain weave fabric,plasma was applied to improve the digital transfer printing.For non-woven fabric because of its structure,plasma was employed to be the pretreatment of PA coating on non-woven fabric and then improve the digital pigment printing and UV induced digital pigment printing.In the two ways,the research was conducted to develop good ink-jet printing properties of two kinds of PET fabrics and luxury decorative packing materials as the purpose.For plain weave fabric,O2 plasma treatment was done with different time to find the optimum value which can result good printing properties.Printed fabric color yield and fastness property were measured to see the effect of plasma on the printed property.The changes in morphology,surface chemistry,wetting behavior,thermal changes happed on the treated fabric after plasma modification were characterized by SEM,XPS,contact angle and TGA.SEM pictures showed obviously the surface roughness increased.XPS revealed the chemical oxygen containing polar group increased.Water contact angle measurement presented the increased wettability on PET fabric surface.These changes were caused by high energy particles of plasma,and the surface roughness increased may give the main explanation which helps to enrich the transferred disperse dyes on the rough surface and change the optical reflection leading to the increased color yield on digital transfer printing of PET fabric.TG analysis showed very little damage on PET fabric caused by plasma,which even less than the thermal damage was caused by transfer printing.The total damage was still little on the transfer printed PET fabric by plasma pretreatment even though plasma treatment enhanced the damage during thermal transfer printing.For PET non-woven fabric,a coating solution made with methanol,anhydrous calcium chloride,and waste PA 6 filament was used on the fabric.Plasma was also employed to make the fabric hydrophilic and hence increase the absorption of the PA 6 coating solution which then formed PA 6 coating on PET non-woven fabric.After that a digital printing was done on the fabric to compare the K/S value on untreated,coated with different concentrated,and plasma pretreated and coated with different PA 6 concentration.The results indicated that the plasma treatment can change PET non-woven fabric from strong hydrophobicity to strong hydrophilicity and allow the fabric more easily to absorb coating solution containing dissolved waste PA 6 filament in lower concentration.The PA 6 coating also achieved hydrophilic on the surface of PET non-woven fabric and facilitated the ink absorption in pigment digital ink-jet printing,which helped the printed PET non-woven fabrics have higher color yield and clear resolution.Therefore,plasma treatment firstly plus PA coating can help prepare luxurious patterned PET non-woven packing material through ink-jet printing,even though the plasma treatment and coating caused a little negative influence in whiteness and handle. |
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