How is FRP ventilation pipe made?
Mould makingA circular or rectangular glass steel duct forming was used in the model. In the mode of circular duct production, with appropriate diameter small key tube, or wood, plywood and iron plate made of circular tube, the outer diameter is equal to the inner diameter of the circular duct; internal rectangular duct made by wood do Jackie Chan bone, then wood or plywood, steel plate fixed dry keel, the die size is equal to the inner diameter of rectangular duct. The inner mould of the round or rectangular wind pipe can be disassembled, so that it is easy to release.
Coating moldingOn the surface of the mold, a transparent glass paper is fixed on the surface of the bread. When it is fixed, it is coated with a resin coating which has been adjusted. It should be even and not exposed. Then apply a layer of glass cloth and then coat with a resin coating. Each coated with a layer of resin is deposited a layer of glass cloth. The cloth lap to stagger and scraping, the outermost layer of ruibu glass surface should be coated with a layer of resin coating. After reaching the required thickness, and then deposited on the outer surface of the glass paper flatten the light pressure.
It should be noted that the flange and the duct shall be a whole and shall be at right angles to the axis of the wind pipe. The flanges of the air duct and its pipe end shall be formed together during the coating process. Glass fibre reinforced plastic pipe flanges shall conform to the provisions of table 5-21.
Solidification strippingThe coated FRP pipe can be released after a period of constant pressure to a certain strength. When the mold is released, the pre - prepared ejection support points shall be removed to separate the mold from the molded air pipe and then to exit the mold. Finally, remove the glass paper on the inside and outside surface. Air duct after stripping. Excess parts or burrs can be polished by hand cutting machine or sand grinder.