1.Manufacturing Process:

HDPE injection molding involves several steps, each crucial to achieving high-quality finished products. The process can be summarized as follows:

• Material Preparation – HDPE resin pellets are carefully selected, inspected, and prepared for the injection molding process.
• Melting and Injection – The resin pellets are loaded into the injection molding machine. Under controlled temperature and pressure, the pellets are melted in the machine’s heated barrel and injected into a mold cavity under high pressure.
• Cooling and Solidification – The injected material rapidly cools and solidifies within the mold, taking on its desired shape and structure.
• Ejection and Finishing – The newly formed HDPE part is ejected from the mold and undergoes any necessary trimming, cleaning, or finishing processes.

2.Specific Requirements：

• Drying: Drying is not necessary if stored properly.
• Melting temperature: 220~260C. For materials with larger molecules, the recommended melting temperature range is between 200 and 250C.
• Mold temperature: 50~95C. Plastic parts with a wall thickness below 6mm should use a higher mold temperature, and plastic parts with a wall thickness above 6mm should use a lower mold temperature. The cooling temperature of plastic parts should be uniform to reduce the difference in shrinkage. For optimal processing cycle time, the diameter of the cooling cavity should be no less than 8mm, and the distance from the mold surface should be within 1.3d (here “d” is the diameter of the cooling cavity).
• Injection pressure: 700~1050bar.
• Injection speed: High-speed injection is recommended.
• Runner and gate: The runner diameter is between 4 and 7.5mm, and the runner length should be as short as possible. Various types of gates can be used, and the gate length should not exceed 0.75mm. Especially suitable for using hot runner molds.