PE PP injection molding screw barrel
1. Hardness after hardening and tempering: HB280-320
2. Nitrided Hardness: HV920-1000
3. Nitrided case depth: 0.50-0.80mm
4. Nitrided brittleness: less than grade 2
5. Surface roughness: Ra 0.4
6. Screw straightness: 0.015 mm
7. Surface chromium-plating's hardness after nitriding: ≥900HV
8. Chromium-plating depth: 0.025~0.10 mm
9. Alloy Hardness: HRC50-65
10. Alloy depth: 0.8~2.0 mm
Injection molding machine screw barrel plays a key role in the injection molding process of PE (polyethylene) and PP (polypropylene) materials. Its application in these two materials is listed below: Melting and mixing of materials: The screw barrel passes through the rotating screw and the heating area to fully heat and compress the PE or PP particles to melt them into a flowable melt. At the same time, the mixing area in the screw barrel can mix the materials of different particles evenly to meet the requirements of specific products. Pressure and injection: Under the action of the screw barrel, the molten PE or PP material is injected into the mold cavity to form the desired product shape. The pressure and injection speed of the screw barrel can be adjusted according to product requirements to ensure the quality of injection molding products. Temperature control and cooling:
The screw barrel is usually equipped with a temperature control system to ensure that the molten material remains at an appropriate temperature. At the same time, after the injection molding is completed, the product needs to pass through a cooling system to solidify the material and maintain its shape.
Control and monitoring of the injection molding process: The screw barrel is usually equipped with a control and monitoring system to monitor parameters such as temperature, pressure and injection speed and adjust them as needed. This contributes to consistent product quality and production efficiency.
In short, the screw barrel of the injection molding machine plays a vital role in the injection molding process of PE and PP materials, ensuring that the materials are fully melted and mixed, and that precise injection molding process control is achieved to produce high-quality injection molding products.
