| 摘要: |
| 目的 提出一种控制和预测印品透印质量的评价方法，为印品图文设计及选纸方面提供理论依据，达到经济化、高质量生产的目的。方法 选取5种不同的非涂布纸样，对其紧度、平滑度、油墨吸收性和不透明度指标进行检测，通过建立PTR模型来评价纸样的抗透印性。在这5种纸样印上CMYK阶调色块，即10%~100%（实地），利用色差法ΔELab来表征每一阶调的透印程度PTq，以ΔELab=3.5作为透印阈值，来建立纸样抗透印性与各阶调之间的关系。结果 从1#纸样到5#纸样的抗透印值PTR依次减小，CMYK在各阶调的透印值也基本呈现相同规律，PTR模型成立；依据透印阈值和每一纸样的线性公式得到相应的阶调值，计算各色的阶调均值，从1#到5#分别为134.15%（计算值），88.9%，51.95%，42.7%，36.15%，以此建立PTR与阶调值的关系曲线。结论 抗透印PTR值在70.5%以下的纸张，适印40%以下阶调的图像；PTR值从71.0%开始不断增大，纸张的适印阶调范围也随之扩大；当PTR值达到73.8%左右时，即使实地色块也不会干扰到背面的图文。 |
| 关键词: 抗透印性 不透明度 油墨吸收性 色差 阶调值 |
| DOI：10.19554/j.cnki.1001-3563.2019.19.038 |
| 分类号:TS802.2 |
| 基金项目: |
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| Relationship between Paper Print-through Resistance and Print Tone |
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JIAO Cheng
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Shanghai Municipal Supervision and Test Station for Quality of Print Products, Shanghai 200042, China
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| Abstract: |
| The work aims to establish an evaluation method for controlling and predicting the print-through quality of printed products to provide theoretical basis for image and text design and paper selection of printed products, and achieve the purpose of economic and high-quality production. Five different kinds of non-coated paper samples were selected to test their compactness, smoothness, ink absorbency and opacity. PTR model was established to evaluate the print-through resistance of paper samples. The five types of paper were printed with CMYK tone block, namely 10%~100% (solid area). The color difference method ΔELab was used to characterize the print-through degree PTq of each tone. With ΔELab=3.5 as the print-through threshold, the relationship between the print-through resistance of the paper and each tone was established. As a result, from 1# paper sample to 5# paper sample, their PTRs decreased successively, the print-through value of CMYK in each tone basically presented the same rule, and the PTR model was established. The corresponding tone values were obtained according to the print-through threshold and the linear formula of each paper sample to calculate the mean tone values of various colors from 1# to 5#, namely 134.15% (calculated value), 88.9%, 51.95%, 42.7% and 36.15%, so as to establish the relation curve between PTR and tone value. In conclusion, the paper with PTR value of less than 70.5% is printable with images whose tone is lower than 40%. PTR value from 71.0% begins to increase, and the printable tone range of the paper is also expanded. When PTR value reaches about 73.8%, even for the solid color block, the image and text on the back will not be interfered. |
| Key words: print-through resistance opacity ink absorbency color difference tone value |
