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6. SPECIAL CAUTION: Observe the operating instructions of the dryer manufacturer. Drying plan maintenance daily inspection: ? Dry air dew point controller; ? Check for proper drying temperature; ? Check the return air temperature before and after the cooler; ? Check the material level in the hopper, ie the loading operation; ? Clean back Wind filters, other filters. Weekly inspection: ? Check the dew point of the airflow; ? Check the regeneration air temperature; ? Clean the filter of the aftercooler to ensure proper water flow to the cooler; ? Check for leaks; ? Replace the old pipe and break the tubing. Note: Drying is the most important process step, and it is not possible to solve future problems without meeting the requirements of the process. Custom Made Plastic Bottles, Plastic Bottle Manufacturer
The key to successful drying PET is: careful attention, good maintenance, and compliance with dryer manufacturers and resin suppliers. PET preform molding preform molding process, the best conditions are as low as possible, as short as possible time, quickly and evenly and completely melted, the maximum to keep the IV less down, as little as possible produce AA, as far as possible Transparent. Related to the process conditions are: temperature molding temperature is the barrel, hot runner temperature. Only 30% of the heat in the molding process comes from external heating, 70% from the internal friction heat, so in addition to the appropriate heating, but also with good shear heat. Injection and containment is to overcome the resistance in the flow channel and fill the melt into the mold. For the preform, it is best to have three speed and pressure, followed by decreasing. Injection speed is too slow, cut enough, filled before the cooling, causing the product is not full or less note; too fast, cavity out of exhaust, resulting in dissatisfaction, shrink, AA high. Holding pressure has two important effects: to prevent the melt back and to ensure that the pressure in the cooling (to improve the cooling effect). Too high will cause excessive filling and expansion, etc., the internal stress will be higher, but also may be crystal. Too low will cause shrinkage, preform deformation (cooling is not enough), gate problems such as pinholes, bubbles, etc., because the gate cooling rate decreased. Packing time should be appropriate, too short will cause pinholes, drawing and so on. Release pressure is to reduce the pressure in the hot runner to prevent the gate clogging, needle valve movement is not flexible and so on.