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Analysis of the Injection Molding Process Flow

Release date:

2022/05/18

It has a wide molding temperature range and exhibits rapid heating, melting, and curing, resulting in generally short molding cycles. Temperature settings: barrel temperature around 200°C; excessively high material temperature can lead to silver streaks, while too low a temperature will compromise transparency.

　　1. Raw materials generally do not require drying; in rare cases, they may be baked at 80°C for 2 hours.

　　2. It has a wide molding temperature range and exhibits rapid heating, melting, and curing, resulting in generally short molding cycles. Temperature settings: barrel temperature around 200°C; excessively high material temperature can lead to silver streaks, while too low a temperature will compromise transparency.

　　3. Mold temperature control: Mold temperature is typically maintained between 50 and 80°C.

　　4. GPPS exhibits excellent flowability, so high injection pressures are not required in molding (typically around 10 MPa) to avoid excessive stress within the molded part, which could lead to cracking—particularly after paint‑finishing processes.

　　5. The injection speed should be kept relatively high to minimize sink marks; however, since injection speed is highly sensitive to injection pressure, excessively high speeds may lead to flash, sticking during mold release, or issues such as whitening and cracking during ejection.

　　6. Appropriate back pressure: If the back pressure is too low, air can easily be entrained during screw rotation, resulting in a lower material density within the barrel and poor plasticization of the pellets, which adversely affects the surface quality of the molded part (typically set at 10–20 kg/cm²). g) In molds, a sub‑gate with a diameter of 0.8–1.0 mm is generally recommended. h) For glass‑fiber‑reinforced PS‑GF30, the barrel temperature should be 180–275°C, the mold temperature 20–80°C, and the molding shrinkage rate 0.1–0.2%. The material density is 1.29 g/cm³.

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