In the spinning plant, the bottle flakes are melted in extruders, and spun into tows.
The melt coming out of the homogenizer goes into spin beam in which the specially-designed distribution piping system guarantees the same dwell time for the melt to reach each spinning position.
After passing through distribution pipes, pin valves, and the metering pump, the melt flows into spin packs uniformly.
There are filtering screen and filter sand inside the spin pack, which remove impurities from the melt. The melt becomes small stream after being extruded from the micro-holes of the spinneret.
The melt piping system and the spin beam are heated by HTM vapor from HTM system. The specially-designed vapor distribution system ensures uniform temperature on each spinneret.
In the quenching chamber, the melt stream is cooled and solidified by uniform cool air. After passing a lip finishing system, the tow is carried to the take-up panel via the spinning cell.
On the take-up panel, the tow from each spinning position is finished by the spin finishes, and then guided by a deflecting roller so that tows from spinning positions become a bundle. The tow creel is arranged for 4 rows, in which, two rows of them are put into using and the other two rows are preparing.
The tows from Tow creel are divided into 3 nos. sheets for drawing. The tow cable come from the creel is guided firstly by Tow guide frame and passed through DIP bath in order to split tow sheets evenly with certain width and thickness, and ensure more even spin finish in tow sheets, and then drawing process starting.
The range uses 2-stage drawing technology. The first drawing stage carries out between Draw stand I and Draw stand II. The second drawing stage carries in Steam draw chest between Draw stand II and Annealer-1. The tow sheets are directly heated by spraying steam in Steam draw chest.
After the tow sheets go through the second drawing stage, the tows obtain the full orientation of molecular structure. The tows are dragged and gone forward through Draw stand III. Then tow sheets are sent into Tow stacker, 3 tow sheets are stacked into 1 tow sheet. The tilt angle of stacking rollers is adjustable for achieving stacking process. The width of the tow sheet and the quality of stacking is special important for crimping.
After stacking, the tow sheet is sent into Crimper through Tension control roller and Steam pre-heating box. The tow sheet is crimped by stuffing box through squeezing to assure the good performances of fiber in later process.
After crimping, the tows are dragged for oiling with silicon oil and then plaiting to chain board type conveying of Hollow Relaxing Dryer after cutting. The cut fibre are heated and dried evenly by blowing of forced air and then cooled down. After heated and dried, the cut fixing length fibre are transported by belt conveyor to the top of Baler and falling in gravity to chamber of Baler for baling, then the bale is manual baling, labeling, reweighing and then sent to the storage by fork lifter.