| 摘要 |
1,115,273. Laminates and laminating. JOHNS-MANVILLE CORPORATION. 21 Jan., 1966 [24 Feb., 1965], No. 3036/66. Heading B5N. A weather-resistant building material comprises a laminate of a cellulosic sheet, e.g. plywood or board lumber, and an asbestos paper adhered to each other by a waterinsoluble adhesive, the asbestos paper containing a water-insoluble binder and defining a weather resistant exterior face of the building material. As described the cellulosic sheet is a five-layer plywood and has the asbestos paper adhered to one face by a vinyl modified phenolic thermosetting glue sold under the name " Duro-Lok " (Registered Trade Mark). The asbestos paper weighs at least 4 lb per 100 sq. ft. and is at least 10 mils thick. It contains at least 4% by weight of a binder such as polyvinyl chloride, vinyl chloride, or vinylidene chloride, and has a porosity such that the time for 100 c.c. of air to pass through the thickness of the paper, as measured by TAPPI Test T-460 M49 is at least 200 secs. The paper, which may be embossed, is abrasion, fire, and weather resistant. In apparatus for making the laminate, Fig. 5, asbestos paper 34 is coated with adhesive by a roller 44 before coming into contact with a cellulosic sheet 42 on a conveyer belt 40. The assembly then passes between pressure rolls 50 and beneath a heater 54 to cure and set the adhesive. |
