Improving Weighing Sorter Accuracy: Calibration of Ejector Response Time in the Pharmaceutical Industry

In pharmaceutical manufacturing, precision in packaging and sorting is essential for quality control. A crucial device in this process is the weighing sorter machine (checkweigher), which sorts products based on weight. The ejector response time calibration directly impacts sorting accuracy and overall product quality.

Role of Weighing Sorters in Pharma Packaging

Weighing sorters verify that each product or package meets strict weight specifications. Off-spec products are removed to prevent defective items from reaching customers, ensuring regulatory compliance and product safety.

What Is Ejector Response Time?

Ejector response time is the delay between detecting a defective product and activating the ejector (e.g., pneumatic arm or air blast) to remove it. Since products move continuously on the conveyor, precise timing is critical.

Poor calibration can cause:

• Missed removal of defective products, risking quality issues

• Unnecessary rejection of good products, increasing waste

Calibration Factors and Methods

Key factors influencing calibration include:

• Conveyor speed: Faster lines need quicker ejector response

• Product size and weight: Affects ejector force and timing

• System latency: Sensor and actuator delays must be accounted for

Common calibration techniques:

• Time delay adjustment: Fine-tune control system delays

• Sensor synchronization: Align detection timing with ejector activation

• Test runs: Perform sample cycles to validate timing accuracy

Benefits of Accurate Ejector Response Time Calibration

• Higher sorting accuracy by removing only defective products

• Reduced product waste from false rejects

• Improved production efficiency with less downtime

• Compliance with pharmaceutical quality standards

Conclusion

In pharmaceutical packaging lines, the weighing sorter is vital for ensuring product quality. Precise calibration of the ejector response time is critical for accurate, efficient sorting. Regular calibration and monitoring help pharmaceutical manufacturers reduce waste, maintain compliance, and safeguard patient safety.