A gravimetric blender is widely used in the plastics processing industry for accurately blending different types, colors, or additives of plastic pellets. Its operating principle is based on gravimetric weighing and automated control, ensuring that each component is mixed according to precise ratios. Here is a detailed explanation of its operation principle:
Operating Principle
1.Feeding System：
Hoppers: The equipment is equipped with multiple hoppers, each containing a different type of plastic pellet or additive. These hoppers are typically located at the top of the equipment.
Feed Valves: Each hopper has a feed valve at the bottom, which controls the flow of materials.
2.Weighing System：
Weighing Hopper: All materials are sequentially fed into a weighing hopper. The weighing hopper has high-precision load cells at the bottom.
Load Cells: These load cells continuously measure the weight of the materials in the hopper and transmit the data to the control system.
3.Recipe Setting:
Control Panel/Computer System: The operator inputs the desired mixing ratios and total weight through the control panel or a connected computer system. The system calculates the precise weight needed for each material based on the input recipe.
4.Feeding Control：
Automatic Feeding: According to the set recipe, the system sequentially opens each hopper’s feed valve, adding each component to the weighing hopper in the correct ratio.
Real-time Weighing: During the addition of each material, the load cells continuously monitor the weight. When the set value is reached, the corresponding feed valve closes.
5.Mixing Process：
Mixer: Once all materials are added to the weighing hopper, an internal mixer starts to evenly blend the different types of plastic pellets. The mixing time and speed can be adjusted as needed.
6.Discharge System：
Discharge Valve: After mixing is complete, the discharge valve at the bottom of the weighing hopper opens, and the blended plastic pellets are discharged.
Conveying System: The blended materials are typically conveyed to an injection molding machine, extruder, or other processing equipment for further processing.
7.Data Recording and Feedback：
Data Storage: Throughout the mixing process, the system records various data such as the actual weight of each material and mixing time.
Feedback Control: By real-time monitoring and data recording, the system can dynamically adjust the feeding process to ensure accurate mixing ratios.
Key Features
High Precision Mixing: Utilizing high-precision load cells and automated control, the gravimetric blender achieves very high mixing accuracy.
Automated Operation: The system is highly automated, reducing manual intervention and increasing production efficiency.
Flexibility: Capable of handling different types and colors of plastic pellets, the blender adapts to diverse production needs.
Data Management: Detailed recording and feedback mechanisms facilitate quality control and production traceability.
Application Scenarios
Injection Molding: In injection molding processes, the gravimetric blender can mix base resins with color masterbatches or other additives to produce uniform and consistent plastic products.
Extrusion Molding: In extrusion processes, the blender mixes various types of resins and additives to ensure product uniformity and quality.
Blow Molding: For blow molding products like bottles and containers, the gravimetric blender precisely controls the ratio of colors and materials.
Through these principles and features, the gravimetric blender plays a crucial role in the plastics processing industry, ensuring product quality and consistency.
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