But there are some exceptions, such as:
1, to change the different manufacturers of raw materials for production
2, to change the different plasticizer raw materials for production, especially containing o-phthalene and non-o-phenylene raw materials to change
3, the equipment needs to be shut down for a long period of time
75A of the conduit if the production of reinforced air tubing Intubation and other products, it is necessary to closely check the frequency of the time of the appearance of yellow and black spots and make a record, such products belong to the value of the higher requirements of higher consumables, special attention should be paid to the replacement of the screen, generally control the replacement of a 20 hours or so, but also according to the actual state of the equipment. Filter is to increase the fluid pressure to obtain a better means of plasticization. Generally better thermal stability of the material appeared in the yellow and black point of the interval is longer, but also easy to record.