日本印刷学会誌
Online ISSN : 1882-4935
Print ISSN : 0914-3319
ISSN-L : 0914-3319
45 巻, 6 号
選択された号の論文の6件中1~6を表示しています
総説
論文
  • 村上 達洋, 原田 修, 内藤 郁夫
    2008 年 45 巻 6 号 p. 624-630
    発行日: 2008年
    公開日: 2010/08/15
    ジャーナル フリー
    We detected many holes on wet printed surface immediately after ink trapping using polyethylene terephthalate (PET) film with a black ink for offset proofing. Number of the holes increased with decreasing the amount of ink trapped (y). The holes were divided roughly to two types, A and B. Characteristics of the type A holes are followings; variable shapes, variable hole size, interference stripes around the holes, etc. The latter ones were round and small (φ < 10μm). The number of the small size holes (φ < 20μm) increased with decreasing the y value. The number of middle size ones (20 < φ < 50μm) has a maximum around y=2.5g m-2. The number of the largest size ones (φ > 50μm) increased with increasing the y value. We obtained similar results in the ink trappings using the PET film with a black ink for synthetic paper. By using the papers, the number of the type A holes decreased and the number of the type B holes increased according to decrease of air permeability of the paper. Therefore, the type A holes are hollow holes yielded by fixed air bubbles between the printing substrate and the ink layer on a roll, and the type B holes must be pinholes yielded both by suspended air bubbles in the ink and by air bubbles appeared from the paper surface.
  • 下山 昌彦, 小林 邦久
    2008 年 45 巻 6 号 p. 631-639
    発行日: 2008年
    公開日: 2010/08/15
    ジャーナル フリー
    We use the multiband scanner for examination of forged printings. This scanner has six sources built-in, one white light source for reflection, one white light source for transmission, one ultraviolet light source, and three kinds of infrared light sources. Each examination for forged printings is conducted under the same conditions with the assistance of this scanner. The resultant images are stored in the personal computer immediately after the examination. Now, in this study, the brightness histograms of resultant images were used for classification of 80 forged notes. At the first setout, the six data set of brightness histograms of six kinds of resultant images were analyzed respectively by multivariate analysis. Each analysis didn't lead to a good result in classification. However, the multivariate analysis of consolidated brightness histograms of six kinds of resultant images classified 80 forged notes into 12 groups.
技術報文
  • 佐藤 正樹, 鈴木 成寿
    2008 年 45 巻 6 号 p. 640-648
    発行日: 2008年
    公開日: 2010/08/15
    ジャーナル フリー
    Recent developments in digital technology has brought great advances to print business on both productivity and environmental issues . Especially non-prepress⁄on demand operation has made true laborsaving innovation in the print industry. Currently the outdoor sign⁄print market is dominated by self adhesive film materials (namely solvent ink onto PVC film) which is then adhered to substrate of choice. The combination of solvent ink jet print and vinyl chloride media can never be considered as environment friendly. Thankfully new proprietary dye-sublimation metal has been developed as the ultimate Eco-friendly solution to this problem. Design steel sheets by heat transfer with sublimation dyes are divided into two groups defined by its performance characteristic. One is giving great formability, designed mainly for machining to various forms for interior use. And the other is giving priority to outdoor weather and UV resistance, and by its very nature offers superior protection against graffiti without need of any secondary process.
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