Small blow molding machine

The bottle blank of a small blow molding machine, also known as a mold blank, is formed by injection molding PET pellets. It requires that the proportion of recycled material should not exceed 10%, and the recycling frequency should not exceed two times. It is necessary to cool the bottle blank mold after injection molding or the bottle blank used after heating for more than 48 hours, and the storage time of the used bottle blank should not exceed 6 months. Different production dates, especially bottles with long distances, cannot be mixed. The main reasons are the different types of raw materials used in the bottle blank, the proportion of secondary materials mixed in, and the residual stress inside the bottle blank. These factors have a serious impact on the blowing molding process and should be treated specifically according to the actual situation.

Due to the strong water absorption of PET, it is necessary to pay special attention to moisture prevention during storage, and it is necessary to dehumidify and dry it before processing. The drying conditions are generally carried out at 150-180 ℃ for 4 hours. In addition, to prevent plastic particles from absorbing moisture again, it is necessary to keep the temperature above 140 ℃. When shutting down to prevent the plastic from turning yellow, the dehumidifier needs to cool down to 100 ℃ and only keep it warm without dehumidification.