精益管（覆塑管、线棒、物流管）
线棒也称为覆塑管、精益管、物流管，是带有塑料树脂涂层的焊接钢管，为防止涂层与钢管分离，他们之间使用特殊的粘合剂粘结。
钢管的内壁为防腐蚀的涂层。
标准的线棒材料直径为28mm，钢管壁厚0.8mm、1.0mm、1.2mm.
塑料树脂层材质为PE、PVC、ABS。
Flexible bar, also called plastic tube, lean tube, and logistic tube .It is welded steel tube with plastic resin coating. The plastic resin coating and steel tube are stuck with a special adhesive to avoid disconnecting.
There is anti-corrosion coating inside of the steel tube.
The standard flexible bar diameter is 28mm with 0.8mm, 1.0mm, and 1.2mm steel wall thickness.
The material for plastic resin coating will be PE,PVC or ABS.