Inline Quality Control for Filling Lines: Checkweighers, X-Ray, Vision and Leak Detection

Inline quality control (QC) is what turns a filling line from "fills bottles" to "fills correct, safe bottles every time." Checkweighers, X-ray, vision and leak detection sit after the filler and before packing to catch under-fill, foreign body, cap and seal defects at full speed. This guide covers what each does and where to place it.

Executive Summary

A layered QC stack—checkweigher for dose, vision for cap/label, X-ray for contaminants, leak tester for seal—protects compliance and brand. On PE bottle and can lines, these run at line speed with reject gates, cutting recall risk and rework.

QC Technology Comparison

Building the Stack

After the Filler

A checkweigher plus leak tester catches dose and seal issues before further handling on the conveyor.

After Capper and Labeler

Vision systems confirm cap seating and label placement; X-ray screens for foreign bodies before the case packer.

Key Takeaways

• QC runs inline at full speed with automatic reject.
• Layered checkweigher + vision + X-ray + leak = full coverage.
• Position each device at the failure point it addresses.

Frequently Asked Questions

Is vision inspection enough without X-ray?

Vision sees surface and cap/label defects; only X-ray finds embedded glass or dense contaminants, so pair them for food safety.

Does QC slow the line?

No—modern inline systems run at line speed with reject gates, adding negligible cycle time.

Add inline QC to your filling machine and conveyor systems from Sunswell.