The rheology of Makeup Packaging in the molten state is good

Identification method
The rheology of Makeup Packaging in the molten state is good, and the pressure has greater influence on the viscosity than the temperature. Therefore, the fluidity of the melt is mainly changed from the pressure. 1. Plastics treatment Because Makeup Packaging macromolecules contain lipid groups and have a certain degree of hydrophilicity, pellets are sensitive to water at high temperatures. When the moisture content exceeds the limit, the molecular weight of Makeup Packaging decreases during processing, and the products are colored. Become brittle. Therefore, the material must be dried before processing. The drying temperature is 150°C for more than 4 hours, typically 170°C for 3-4 hours. Air ejection can be used to check if the material is completely dry. The proportion of recycled materials should generally not exceed 25%, and the recycled materials should be dried.
2. The China Makeup Packaging machine used in injection molding machine has a short stable time after melting point and a higher melting point. Therefore, it is necessary to use injection systems with more temperature control sections and less self-heating friction during plasticization, and the actual product (water-containing material) should be used. The weight should not be less than 2/3 of the injection volume of the machine. Based on these requirements, Ramada has developed a small and medium-sized Makeup Packaging special plasticizing system in recent years. The clamping force is greater than 6300t/m2.
3, mold and gate design Makeup Packaging preforms generally use hot runner mold, between the mold and the injection molding machine template must have insulation board, its thickness is about 12mm, and the insulation board must be able to withstand high pressure. Exhaust must be sufficient to avoid local overheating or fragmentation, but the depth of the exhaust port generally should not exceed 0.03mm, otherwise it is prone to flash.
4. Melt temperature can be measured by air injection method. Different from 270-295°C, the reinforced grade GF-Makeup Packaging can be set to 290-315°C.
5, the injection speed is generally faster, can prevent premature coagulation during injection. But too fast, the high shear rate makes the material fragile. The shot is usually completed within 4 seconds.
6, the lower the back pressure, the better, so as not to wear. Generally does not exceed 100bar. Usually do not need to use.
7. Do not use long residence time to prevent the decrease of molecular weight. Try to avoid temperatures above 300°C. If the stoppage is less than 15 minutes. Only need to be shot; if it is more than 15 minutes, it should be cleaned with viscosity PE and the barrel temperature should be reduced to PE temperature until it is turned on again.
Melted quickly.
Actually, Makeup Packaging needs to include many varieties, such as Makeup Packaging smashing films from foreign factories, pulp blocks, and coils less than 30 cm in length. These have different customer bases.
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