Paper for recycling has become a promising raw material for the pulp and paper industry due to its low cost and because it is conducive to sustainable development. Unfortunately, recycled paper contains a high volume of printed paper that is difficult to deink, which restricts its applications. Flotation deinking plays an essential role in the product quality and process cost of wastepaper recycling. This study was performed to evaluate the deinkability of environmentally friendly offset inks by flotation deinking. For this purpose, three mineral oil free series of four-color inks, namely, hybrid light emitting diode ultraviolet (LED–UV), LED–UV, and vegetable oil-based inks, were printed on white lightweight coated papers under laboratory conditions. The deinking methodology involves repulping, deinking agent treatment, flotation, hand sheet making, and evaluation of the produced hand sheets. The obtained results indicated that the hybrid LED–UV prints had the best deinkability. After flotation deinking, the deinking efficiency and the whiteness of the hybrid LED–UV ink increased by 58.1% and 47.6%, respectively. LED–UV ink had a 46.9% increase in the deinking efficiency and a 37.0% increase in the whiteness of the hand sheet. The deinking efficiency of the vegetable oil-based ink was the lowest, at 42.1%, and the whiteness of the hand sheet increased only by 23.8%. The particle size distribution analysis demonstrated that the hybrid LED–UV four-color ink exhibited a larger value of the average particle size than the two other. Scanning electron microscopy revealed that the hybrid LED–UV ink particles on the surface of the fibers were the least abundant after deinking. The physical strength properties of the hand sheets, including tensile index, folding resistance, and interlayer bonding strength of the hybrid LED–UV, LED–UV inks, and vegetable oil-based inks, increased.

再生纸由于成本低廉，有利于可持续发展，已成为制浆造纸工业很有前途的原料。不幸的是，再生纸含有大量难以脱墨的印刷纸，这限制了它的应用。浮选脱墨对废纸回收的产品质量和工艺成本起着至关重要的作用。本研究旨在通过浮选脱墨评估环保型胶印油墨的脱墨性。为此，在实验室条件下将三种无矿物油系列四色油墨，即混合发光二极管紫外线 (LED-UV)、LED-UV 和植物油基油墨印刷在白色轻质涂层纸上。脱墨方法包括再制浆、脱墨剂处理、浮选、手抄纸制作，以及所生产的手抄纸的评估。获得的结果表明混合 LED-UV 印刷品具有最佳的脱墨性。浮选脱墨后，混合 LED-UV 油墨的脱墨效率和白度分别提高了 58.1% 和 47.6%。LED-UV油墨的脱墨效率提高了46.9%，手抄纸的白度提高了37.0%。植物油基油墨的脱墨效率最低，为42.1%，手抄纸的白度仅提高了23.8%。粒度分布分析表明，混合 LED-UV 四色油墨的平均粒度值大于其他两种油墨。扫描电子显微镜显示，脱墨后纤维表面的混合 LED-UV 墨水颗粒数量最少。