What is the knowledge about the bottle embryo of the blow molding
machine? The bottle blank of the blow molding machine, also known as the parison, is made of PET pellets by injection molding. It requires that the proportion of recycled materials should not exceed 10%, and the number of recycling should not exceed two times. The preforms after injection molding or preforms used after heating must be cooled for more than 48 hours, and the preforms used should not be stored for more than 6 months. Different production dates, especially preforms with long intervals, cannot be mixed. The main reason is The type of raw materials used in the preform, the proportion of secondary materials mixed in and the residual stress in the preform are different, and these factors have a significant impact on the molding process of the bottle, and should be treated according to the actual situation. Because PET has strong water absorption, special attention must be paid to moisture protection during storage, and it must be effectively dehumidified and dried before processing. The drying conditions are usually 150-180 ° C for 4 hours, and in order to prevent the plastic particles from reabsorbing moisture, it must be Keep the temperature above 140°C. In order to prevent the plastic from turning yellow when the machine is shut down, the dehumidifying dryer needs to be cooled to 100°C. In addition, if the material temperature is too high, the shear force of the screw is too high or the rotation speed is too fast, acetaldehyde will easily be produced and cause acidification during PET injection molding. Usually, the acetaldehyde content of the PET bottle after molding must be less than 3ppm. A certain moisture content is required, generally about 1000 ppm, and at least 900 ppm or more, so the preform needs to be placed for a period of time after injection and the moisture content can reach the requirement before crystallization.
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