Analysis of Phase Transfer of Thermal Chemicals in Linerless Thermal Labels

DOI Web Site
  • Morie Masahiro
    Material Analysis Center, Innovation Promotion Division, Oji Holdings Corp.

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Other Title
  • ライナーレス感熱ラベルにおける感熱薬品の層間移動に関する分析

Abstract

<p>Thermal paper is made by applying a coating layer containing a colorless leuco dye and a color developer dispersed in fine particles on a paper base material, and when heat is partially applied to the coated surface, it becomes a leuco dye at that location. The color developer melts and comes into contact with each other, causing a chemical reaction to develop color. In addition, a sensitizer or an ultraviolet absorber that accelerates color development is used according to the specifications.</p><p>Normally, the thermal label is attached to the release paper after applying an adhesive to the back surface of the thermal paper, but the linerless thermal label is directly attached by providing a release layer on the thermal surface side of the adhesive-processed top paper for the thermal label. Since they are combined, there are merits such as no need for release paper, reduction of waste, and the length of the label roll can be increased with the same diameter.</p><p>During the development of this linerless thermal label, when an acrylic emulsion-based adhesive, which is also used in ordinary thermal labels, was used, a case of desensitization （decrease in print density） occurred. Since there were no cases of occurrence with ordinary thermal labels, the direction of improvement could not be determined. Therefore, it was decided to analyze whether or not the thermal chemical components had changed before and after desensitization.</p>

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 76 (1), 37-40, 2022

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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