对采用负压定径技术生产大管径聚乙烯管的挤出成型工艺及其主要设备进行了研究。
The extrusion molding process and main equipment for producing PE large diameter pipe with negative pressure sizing technology are studied.
在成型和定径时运用成组技术，可用一套开口孔型辊、定径辊生产一组外径相近的焊管。
With the grouping technique it is allowed to produce a group of tube sizes with similar O.
中径电阻焊管生产线，用来生产圆管、方管和矩形管，起始原料是根据BTM 520标准的76 - 165 mm的热轧和冷轧钢卷。
ERW pipe and profile machine complete line to manufacture, round square and rectangular pipes. install and start the BTM520 (76-165mm) hot and cold rolled steel coils.
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