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BOREIri <br />CH <br />The aim to add agentia of hot wash is to supplement insufficient of previous washing process <br />of complete bottle, especially, washing dirt within bottle materials. Meanwhile, it uses gravity <br />separation to isolate float materials. The agentia used in this process is the same as that of the <br />process of complete bottle washing. The proportion (see Table 29-1) of the first drug solution <br />in hot washing barrel is: TF -131 30 Kg, caustic soda flake 20Kg, trisodium phosphate 5Kg- <br />1 OKg. <br />The first step is to start hot wash to stir. After bottle flakes cleaned up, start up friction machine <br />and dryer. After their stable operation, start up hot -washing discharge screw, and hot -washing <br />water circulation pump. For equipment stoppage, stop hot wash discharge screw, water <br />circulation pump, and hot wash stir successively. Turn off dryer until all bottle flakes within <br />friction machine and dryer completely discharged. <br />During the operation, make sure the bottle flakes in hot -washing barrel filled half (the bottle <br />flakes content can be measured by small club reaching to detect barrel through prepared hole <br />of hot -washing barrel) to guarantee time of hot wash of flake materials (Table 29-2).Ssome <br />suitable agentia should be added when washing (A PH detector is designed for automatic <br />agentia adding. When the concentration is decreasing, agentia will be added automatically). <br />For hot wash agentia solution is recycling, the agentia need to be changed at times. Generally, <br />agentia water in agentia slag chute shall be let out after each shift and clean water added in <br />the next shift, where it is unnecessary for complete replacement. The temperature of hot wash <br />is required above 85 °C. Control water yield of hot -washing circulation pump. Supplement the <br />amount of circulation pump that the discharge screw takes away to keep balance. The speed <br />of discharge screw shall not be too high and the frequency shall be adjusted slowly. <br />Table 29-1 agentia dosing for hot washing (weight ratio to PET bottle flakes): <br />142 <br />