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Cold tack of urea formaldehyde resins as an important factor in plywood production

机译:脲醛树脂的冷粘性是胶合板生产的重要因素

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摘要

The ability of urea formaldehyde (UF) resins to develop cold tack is needed in plywood production during pre-pressing in a cold press to ensure that the veneers stick together, can be transported, and fit into a multi-daylight hot press. The influence of defined factors on the cold tack was analyzed by determining the tensile shear strength of uncured birch veneers bonded with UF resin, and the statistically significant impact factors were determined. The factors tested were lay-up time, resin amount, resin age, moisture content, veneer temperature and pre-press time. Moisture content and veneer temperature had the highest impact on the cold tack of UF resins. A negative impact of high moisture content on the tensile shear strength and therefore on the cold tack of UF resins was proven as well as a positive impact of a comparably high (30 degrees C) veneer temperature. Lay-up time and pre-press time showed a minor impact on the tensile shear strength. Models were created using Design-Expert software to calculate the optimum operation conditions for cold tack.
机译:在冷压机中进行预压过程中,胶合板生产需要脲醛树脂(UF)树脂具有冷粘能力,以确保单板粘在一起,可以运输并适合多日制热压机。通过确定未固化的与UF树脂粘合的桦木贴面的拉伸剪切强度,分析了定义因素对冷粘性的影响,并确定了具有统计学意义的影响因素。测试的因素是上胶时间,树脂用量,树脂老化时间,含水量,单板温度和预压时间。水分含量和贴面温度对UF树脂的冷粘性影响最大。事实证明,高水分含量对UF树脂的拉伸剪切强度有不利影响,因此对UF树脂的冷粘性也有不利影响,而单板温度较高(30摄氏度)也有积极影响。铺压时间和预压时间对拉伸剪切强度影响很小。使用Design-Expert软件创建模型以计算冷粘的最佳操作条件。

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  • 来源
    《Holz als Roh- und Werkstoff》 |2018年第5期|1391-1398|共8页
  • 作者单位

    Wood K Plus Kompetenzzentrum Holz GmbH, Altenberger Str 69, A-4040 Linz, Austria;

    Wood K Plus Kompetenzzentrum Holz GmbH, Altenberger Str 69, A-4040 Linz, Austria;

    Metadynea Austria GmbH, Hafenstr 77, A-3500 Krems, Austria;

    Metadynea Austria GmbH, Hafenstr 77, A-3500 Krems, Austria;

    Univ Nat Resources & Appl Life Sci, Gregor Mendel Str 33, A-1180 Vienna, Austria;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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