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REVIEW - INFLUENCE OF PANEL MOISTURE CONTENT ON POWDER COATING OFMEDIUM DENSITY FIBREBOARD (MDF)

机译：综述-面板含水量对中密度纤维板（MDF）粉末涂层的影响

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摘要

Powder coating medium density fibreboards (MDF) is an emerging environmentally sustainable coating technology that is used today mainly in the furniture industry.Generally the powder coating process can be divided into following steps: First, the MDF panels have to be conditioned. After that the surface is sanded, the work piece is hung on hangers and cleaned by pressurized air. Than the MDF is IR-preheated to improve the following electrostatic powder application. Finally, the powder is melted and cured in the curing oven. After powder primer curing the process starts again for the top coat application.This work summarises the results of different research works on the influence of panel moisture content on powder coating of MDF: Firstly, the electrostatic powder application is influenced by the moisture content due to the increase of electrical resistance with decreasing panel moisture content. If the MDF panel is too dry (high electrical resistance) the required transport of electric charges during electrostatic powder application is not at all or only insufficiently provided, leading to an insufficient film formation and low coating thickness. Additionally, the results indicate a distinct tendency towards the development of cracks (edge cracking during the melting and curing process in the oven) increasing with panel moisture content.
机译：粉末涂料中密度纤维板（MDF）是一种新兴的环保可持续涂料技术，如今主要用于家具行业。通常，粉末涂料工艺可分为以下步骤：首先，必须对MDF面板进行调理。表面打磨之后，将工件悬挂在衣架上并用压缩空气清洁。中密度纤维板不进行红外预热，以改善随后的静电粉末应用。最后，粉末在固化炉中熔化并固化。粉末底漆固化后，该工艺再次开始用于面漆。这项工作总结了不同研究工作对面板含水量对MDF粉末涂料的影响的结果：首先，静电粉末的施用受水分含量的影响。随着面板含水量的减少电阻的增加。如果MDF面板太干（高电阻），则在静电粉末施加过程中所需的电荷传输根本没有或仅不足以提供，从而导致不足的成膜性和较低的涂层厚度。此外，结果表明，随着面板含水量的增加，裂纹发展的趋势（在烤箱中熔化和固化过程中的边缘裂纹）明显增加。

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