Impregnation resins for décor-paper consist of either melamine-formaldehyde (MF) or urea-formaldehyde (UF) pre-polymers in aqueous solution. Such resins are living chemicals with a limited shelf life of 1-3 weeks. Prior to use the resins are blended with water to adjust the viscosity, and at the same time catalysts and additives are added. In a typical two-stage impregnation process the paper core is first impregnated with a UF resin to fill all the voids to accomplish good internal tear strength. After the drying of the core resin the surfaces are coated in a second step with the MF resin thereby achieving superior surface characteristics such as hardness, scratch resistance, and vivid colors. After the MF resin is dried likewise the paper can be cut to size and stored for several months before laminated onto particleboards and MDF for furniture and flooring.如无特殊说明，文章均为本站原创，转载请注明出处。If there are no special instructions, the articles are original, if you want to use or reproduce, please indicate the original source www.plywoodinspection.com,If you find that our articles infringe on your copyrights and interests, please email us at email@example.com in time and we will delete it at the first time.