Технические руководства по химическим веществам для печати на текстиле
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Why Disperse Digital Prints Lose Sharpness During Heat Fixation: Ink Migration, Fabric and Pretreatment Causes
Direct disperse inkjet prints can look sharp immediately after printing yet become softer, wider or less defined after heat fixation. When this happens, the root cause is not automatically the printer. High-temperature fixation changes the mobility of disperse dye, residual ink vehicles, pretreatment polymers and the polyester substrate itself. If the printed image still contains mobile dye or liquid, heat can continue the redistribution that began during printing. If the pretreatment film softens or releases dye unevenly, edge definition can change during fixation. If the fabric shrinks, relaxes or changes geometry under heat and tension, measured line width and edge appearance can also change. The correct diagnosis compares image geometry before fixation, after fixation and after reduction clearing, while holding ink load, pretreatment add-on, fabric tension and thermal conditions under control.
Reduction Clearing After Direct Disperse Digital Printing: How Pretreatment Residue Affects Washing and Final Surface Quality
Reduction clearing after direct disperse digital printing does more than remove visible surface dye. The final polyester surface can also contain pretreatment polymer, dispersing agents, wetting components, salts and other auxiliaries that were applied before printing or carried by the ink. These residues do not all respond to the same washing mechanism. Traditional alkaline reduction clearing is particularly effective at destroying or solubilizing unfixed surface disperse dye, while pretreatment polymers must usually be removed through their own water solubility, swelling, dispersion and mechanical washing behavior. If pretreatment add-on is too high, thermally changed, poorly water-removable or unevenly distributed, the finished fabric can retain a coated hand, haze, surface drag or inconsistent rubbing even when color strength looks acceptable. Final process approval should therefore evaluate surface dye removal and pretreatment-residue removal separately.
Polyester Fabric Preparation Before Direct Disperse Inkjet Printing: Oil Removal, Heat Setting and Surface Uniformity
Polyester fabric preparation before direct disperse inkjet printing is not simply a cleaning step. Spin finish, knitting oil, weaving size, antistatic agents, silicone-containing finishes, uneven heat-setting history and widthwise surface variation can all change how a later pretreatment wets the fabric and how disperse ink spreads before fixation. Effective preparation therefore has three goals: remove interfering oils and residues, stabilize the polyester fabric against later heat exposure, and create a uniform printable surface across the full fabric width and production length. The correct route is not “maximum scouring” or “maximum heat setting.” It is a controlled preparation window that produces repeatable cleanliness, wettability, dimensional stability and surface uniformity without unnecessarily damaging the polyester or changing dyeability.
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