The production line is developed with the 1990s advanced technology of West Europe by our company. The main machine is SJSZ51/105 or SJZ65/132 conical twin-screw extruder, matching with double-pipe single-control stainless steel spraying & calibration tank. It avoids to waste when one pipe is adjusted and the other one is affected. The auto single-control double haul-off and cutter are combined with the front calibration technology to make operation more flexible. Let you enjoy economic benefit which is brought about by separately control double-pipe extruding. The diameter is about φ20-φ63.It can fully make use of the extruding capacity of the extruder. Even if it produces small diameter pipe, and it can get high output, too.