Method of making laminated asbestos cement plates
阅读：633发布：2021-10-26
专利汇可以提供Method of making laminated asbestos cement plates专利检索，专利查询，专利分析的服务。并且An asbestos-cement plate or sheet is coated with a resorcinol/formaldehyde dispersion or emulsion which is precondensed in and on the asbestos plate. A melamine/aldehyde foil is then applied and bonded under heat and pressure to the substrate.，下面是Method of making laminated asbestos cement plates专利的具体信息内容。
2. The method defined in claim 1 wherein said suspension is dried under infrared radiation.
3. The method defined in claim 2, further comprising the step of roughening the underside of said foil prior to exposing same upon said suspension.
4. A method of making a plate, comprising the steps of coating a surface of a porous asbestos-cement substrate with an aqueous suspension of a thermosetting formaldehyde/resorcinol resin binder and permitting said suspension to penetrate into said substrate;at least partially drying said suspension on said substrate by subjecting the same to infrared radiation; applying a melamine foil to the surface of said substrate coated with said suspension subsequent to the treatment thereof with infrared radiation; and bonding said foil to said resin and to said substrate under heat and pressure for a period and at a temperature sufficient to crosslink said formaldehyde-resorcinol binder to said foil and anchor said foil to said substrate through tentacles of the resin penetrating the substrate.
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