欢迎访问林业科学,今天是

林业科学 ›› 2018, Vol. 54 ›› Issue (1): 111-120.doi: 10.11707/j.1001-7488.20180113

• 论文与研究报告 • 上一篇    下一篇

涂料涂布对人造板装饰原纸表面性状和印刷适性的影响及其机制

张正健, 张启莲, 张明志, 黄汝权   

  1. 天津科技大学包装与印刷工程学院 天津 300222
  • 收稿日期:2016-05-05 修回日期:2017-08-30 出版日期:2018-01-25 发布日期:2018-03-01
  • 基金资助:
    天津市应用基础与前沿技术研究计划青年项目(15JCQNJC42300)。

Effect of Paint Coating on the Surface Character and Printability of Decorative Paper for Wood-Based Panels and Its Mechanism Analysis

Zhang Zhengjian, Zhang Qilian, Zhang Mingzhi, Huang Ruquan   

  1. College of Packaging and Printing Engineering, Tianjin University of Science & Technology Tianjin 300222
  • Received:2016-05-05 Revised:2017-08-30 Online:2018-01-25 Published:2018-03-01

摘要: [目的]结合装饰原纸抄造和涂布整饰工艺,研究颜料化涂布改善装饰原纸印刷适性的作用机制,为装饰原纸的性能改善及其在人造板装饰领域的运用提供参考依据。[方法]优选阔叶木浆和针叶木浆,辅以二氧化钛、聚丙烯酰胺(PAM)、聚酰胺环氧氯丙烷(PAE)、硫酸铝等填料和助剂,通过动态纸页成型器抄造装饰原纸;以聚乙烯醇(PVA)、阳离子淀粉为胶黏剂,添加蒸馏水、颜料、分散剂等助剂,在高速搅拌机中搅拌40~60 min,制备涂料,通过激光粒度仪、锥板黏度计分析涂料的粒径和触变性;采用涂布机和压光机对所制装饰原纸进行涂布和压光整饰,利用SEM、AFM、动态渗透分析仪、动态接触角测定仪对涂布装饰原纸的涂层形貌结构进行表征分析;采用印刷适性仪对涂布装饰原纸进行凹版印刷打样,通过色密度计测量样张的颜色特性,分析涂布装饰原纸的印刷性能。[结果]通过粒径和触变性分析得出,TiO2(201)和SiO2颜料粒径小且分布窄,TiO2(902)和Clay颜料粒径大且分布宽,而Al2O3颜料粒径小且分布宽,颜料制备成涂料后涂料粒径分布范围均变大,其中Clay涂料粒径分布范围最大,SiO2涂料粒径分布范围最小;Clay涂料和Al2O3涂料的触变性大,TiO2(902)涂料和SiO2涂料触变性小;涂层结构性能研究发现,SiO2涂层能更有效覆盖原纸表面,且孔隙分布均匀;SiO2涂层在1.3 s内动态接触角下降幅度达58.17%,且动态渗透Ci最小为17.6,Ct为2.8,表明SiO2涂布装饰原纸表面的孔隙小且更加紧密,易形成良好的均匀紧密涂层结构;在涂布装饰原纸物理性能改善方面,紧度提高25%~61%,吸水高度提高33%~118%,平滑度提高150%~290%,干抗张强度提高171%~194%,湿抗张强度提高220%~290%,其中SiO2涂料涂布装饰原纸的综合物理性能最优,紧度提高25%,吸水高度提高108%,平滑度提高290%,干抗张强度提高171%,湿抗张强度提高290%;在印刷性能方面,SiO2涂布装饰原纸在凹印网穴深度为33 μm时,其印品的青品黄三色密度分别达到1.31、1.3和1.28,比原纸色密度提高16.5%~40%,颜色整体阶调再现范围变大,印刷装饰效果更加优异。[结论]对装饰原纸进行SiO2涂料涂布,能够有效填充装饰原纸表面孔隙,形成优良的涂层结构,有助于印刷油墨的吸收固着,从而抑制网点扩大进而起到有效改善原纸印刷适性作用。

关键词: 人造板, 装饰原纸, 木材表面装饰, 表面涂层结构, 印刷适性

Abstract: [Objective] Combing with papermaking and coating finishing process of decorative paper, the influence of coating on the printability of decorative base paper and its act mechanism were investigated, which provide the reference basis for the improvement of performance of decorative base paper and its use in the field of wood panel decoration.[Method] Decorative base paper was made through dynamic sheet former, using mixed pulp of fine hardwood and softwood, TiO2, polyacrylamide (PAM), polyamide epichlorohydrin (PAE), aluminum sulfate and other filler additives as raw material. Surface coating was prepared with PVA, cationic starch as the adhesive, then distilled water, pigments, dispersants and other additives were added in a high-speed mixer stirring for 40-60 min. The particle size and thixotropy of the coating were analyzed by laser particle size analyzer and cone-plate viscometer. The decorative base paper was coated and calendered by using a coater and a calendar, respectively.The morphology of the coated decorative base paper was characterized by SEM, AFM, dynamic osmometry and dynamic contact angle analyzer. The printability tester was used for the intaglio printing proofing of coating decorative base paper, measuring the color characteristics of proofs by color density meter, and analyzing the printing performance of coating decorative base paper.[Result] Based on particle size and thixotropy analysis of pigments, it was found that TiO2 (201) and SiO2 pigments had small particle size and narrow distribution, but TiO2 (902) and Clay pigments had large particle size and wide distribution, while Al2O3 pigment had small particle size and wide distribution. When the pigments were prepared into coatings, the particle size distribution range of pigment coating became larger, in which the Clay coating had the largest particle size distribution, and the SiO2 coating had the smallest particle size range. However, the thixotropy of Clay coating and Al2O3 coating was the biggest, and the thixotropy of TiO2 (902) coating and SiO2 coating was the smallest. The coating structure, surface morphology and the printing performance were characterized through using of SEM, AFM, dynamic permeation analyzers and dynamic contact angle measurement. The result showed that the surface of the base paper could be covered more effectively with the SiO2 coating, and the pore of coating layer was uniform. Dynamic contact angle of SiO2 coating layer has declined by 58.17% within 1.3 s, and the Ci and Ct value was 17.6 and 2.8, respectively. It showed that the surface of base paper coated by SiO2 coating had the optimal coating structure. Physical properties of coated decorative base papers were improved significantly, in which the tightness, water absorption height, smoothness, dry tensile strength and wet tensile strength was increased by 25%-61%, 33%-118%, 150%-290%, 171%-194%, and 220%-290% respectively. The physical properties of SiO2 coated base paper were the best, with tightness increasing by 25%, water absorption height increasing by 108%, smoothness increasing by 290%, dry tensile strength increasing by 171% and wet tensile strength increasing by 290%. For the printability of the decorative base paper coated with SiO2 coating, the color density was increased by 16.5% to 40%, comparing the decorative base paper, and the value of CMY of gravure printing color was 1.31, 1.3, 1.28 for the net hole depth of 33 μm respectively which were beneficial to improve the overall reproduction range of color and the effect of printing decoration.[Conclusion] The pores of surface structure of decorative base paper could be filled by the SiO2 coating effectively, forming an excellent coating structure, which contributed the good ink receptivity, ink absorption and ink fixing properties, thereby inhibiting dot enlargement and further improving the printability of base paper.

Key words: wood-based panels, decorative paper, wood surfaces decorative, surface coating structure, printability

中图分类号: