pvc塑料板的制造要求
Manufacturing requirements of PVC plastic plate
增强聚丙烯pvc塑料板采用挤出成型，管件采用模压成型和热熔挤压焊接工艺。
The reinforced polypropylene PVC plastic plate is extruded, and the pipe fittings are molded and hot-melt extruded.
模压成型的法兰和管端突缘须进行外形切削加工，尺寸满足要求后、方能与增强聚丙烯pvc塑料板焊接。
The molded flange and pipe end flange must be cut and welded with the reinforced polypropylene PVC plastic plate after the size meets the requirements.
pvc塑料板和管件的外径、壁厚、几何尺寸，必须符合本标准。突面法兰连接端的密封面的不水平度应小于0.3mm 。
The outer diameter, wall thickness and geometric dimension of PVC plastic plates and pipe fittings must conform to this standard. The non levelness of the sealing surface at the connecting end of raised face flange shall be less than 0.3mm.
采用公称外径D17～D70的螺纹管件时，应先将管的管端加工成螺纹，**聚四氟乙烯带，再拧上以保证密封，并根据具体要求可加密封焊。
When using the threaded pipe fittings with the nominal outer diameter of d17-d70, the pipe end of the pipe shall be processed into a thread, * * polytetrafluoroethylene tape, and then screwed to ensure the sealing. According to the specific requirements, the sealing can be increased.
公称外径D75和D75以上的管和管件采用热熔挤压焊接时，pvc塑料板要求两管端焊面平整，中心对准，轴心一致，以保证焊接时两个焊面紧密接触。加热板的表面温度应在230～240℃，加热时间为40～50s焊后冷却时间在3min以上，再卸夹具。焊工必须经考试合格方能上岗。
When hot melt extrusion welding is adopted for pipes and pipe fittings with a nominal outer diameter of d75 and above, the welding surface of the two pipe ends of PVC plastic plate is required to be flat, the center is aligned and the axis is consistent, so as to ensure that the two welding surfaces are in close contact during welding. The surface temperature of the heating plate shall be 230-240 ℃, the heating time shall be 40-50s, the cooling time after welding shall be more than 3min, and then the fixture shall be removed. Welders must pass the examination before they can work.
管与管件、法兰和管端突缘焊接时，管件、法兰和管端突缘部的接管壁厚应与管子的壁厚系列相同才能进行。
When the pipe is welded with the pipe fitting, flange and pipe end flange, the wall thickness of the connecting pipe of the pipe fitting, flange and pipe end flange shall be the same as the wall thickness series of the pipe.
管与管件采用法兰连接时，应根据介质性能采用石棉橡胶垫片或软橡胶垫片.
Asbestos rubber gasket or soft rubber gasket shall be used according to the medium performance when the pipe and pipe fittings are connected by flange
