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The pet plastic bottle has better rheology in the molten state, and the pressure has a greater influence on the viscosity than the temperature. Therefore, the pressure is mainly used to change the mobility of the melt. Plastic bottles have different usage conditions in different environments, so the rheology and viscosity of the plastic bottles are effectively controlled in the molten state.
1. Plastic processing. Because pet plastic bottle macromolecule contains fat base, which has certain hydrophilicity, pellets are more sensitive to water at high temperature. When the moisture content exceeds the limit, the molecular weight of pet plastic bottle will decrease during processing. The product is colored and brittle. Because of this, the materials must be dried before processing. The drying temperature is 150°C for more than 4 hours, generally 170°C for 3-4 hours. The air shot method can be used to check whether the material is completely dry. When using materials, the raw materials should be dried to a certain extent, and different drying temperatures and time limits should be paid attention to to ensure that the plastic bottles produced have good product functions.
2. The injection molding machine uses pet plastic bottles because the time after the melting point is short and the melting point is higher. Therefore, it is necessary to select an injection system with more temperature control sections and less self-friction heat generation during plasticization. Material) The actual weight cannot be less than 2/3 of the injection volume of the machine.
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