| 摘要 |
To obtain a flexible and elastic thermally insulated tube of stable quality by preventing a premature foaming reaction of a thermally insulating material and facilitating the stability and controllability of the foaming process, the line comprises, arranged in series: an unwinding device supplying a working tube, a straightening device, a guiding device, a high-precision filling unit, an extrusion head, an extruder and a cooling tub, wherein the line is equipped with a two- or multi-channel conditioning system which is arranged in a cavity of the extrusion head and comprises a positioning guide for guiding the movement and preventing the sagging of the working tube, and two or more channel assemblies with a channel for feeding the foaming thermally insulating material, which channel is coiled and has a coolant circulating therein, and the line is also equipped with a rotating calibrating device which is arranged in the cooling tub and provides for forming an outer protective tubular casing in a helical shape and its cooling. |
