Selecting Checkweighers for high-speed pharmaceutical production lines requires not only precision and speed but also compliance with the stringent requirements of GMP, FDA, and 21 CFR Part 11. Different packaging formats place specific demands on checkweigher design, feeding, and testing. The following analysis is based on packaging categories.
A. For Carton/Box Checkweigher
Typical Applications
Cardboard/corrugated cardboard packaging for pharmaceuticals
Key Selection Criteria
1.Speed (Throughput)
High-speed lines typically 60–200 cartons/min.
Weighing platform width and conveyor belt pitch are matched according to line speed.
2.Accuracy & Stability
Target error is typically ±0.1–0.5g (depending on carton weight). Requires a high-resolution load cell.
3.Mechanical Design
Wide conveyor belt, side-guided anti-impact system.
Carton alignment device, anti-tipping device.
Suitable for quick changeover of various carton sizes.
4.Integration with Line
Works with coding machines and automated packing systems.
Can output NG signals to rejection devices.
Box Checkweigher:
High Speed Checkweigher:
B. For Sachet / Bag Checkweigher
Typical Applications
1.Small bags of powder, granules, and tablets
2.Sweeteners, small packages of traditional Chinese medicine
3.Blister packaging
Key Selection Criteria
1.High Speed + Low Weight Handling
Many bags weigh only a few grams, requiring high precision.
Suitable for multi-lane weighing systems (can be integrated with packaging machines).
2.Flexible Guide & Spacing
Softer bags are prone to shifting.
Requires flexible guides and vibration feeding to prevent misalignment.
3.Conveyor & Senso
Low-inertia conveyor belts facilitate fast and stable weighing. Photoelectric/laser detection of bag entry position.
4.Accuracy Expectation
±0.01g~±0.3g (depending on bag size and weight)
5.Multi-lane Suitable for 2, 4, or 6 parallel small bag channels, significantly increasing throughput.
Blister Checkweigher:
Multi lane Checkweigher:
C. For Bottle Checkweigher
Typical Applications
1.Plastic/glass bottled liquids
2.Tablet/pill bottles
Key Selection Criteria
1.Bottle Stability
Round and oval bottles are prone to rolling. Requires bottle clamping devices.
2. Integration with Feeding
Direct integration from filling/capping machines. PD control of bottle spacing (bottle spacing adjustment).
3.Reject Mechanism:
Tilt rejection, push rod rejection, high-speed air blowing.
Requires sufficient force to ensure rapid removal of NG (non-compliant) items.
4.Accuracy: ±0.2g (small vial) to ±1g (large vial). Depends on vial weight and liquid weight variations.
Bottle Rotary Checkweigher:
SG-100HH Bottle Checkweigher:
D. For Single Capsules/Tablets Checkweigher
Typical Applications:
Capsules, tablets, pills
Key Selection Criteria:
1.Small Weight & High Precision
A single tablet may only contain tens of milligrams.
2.Matching Production Line Speed
Must support high-speed, sensitive dynamic weighing (e.g., tens of thousands of capsules/tablets per hour) to avoid impacting the entire production line cycle time due to insufficient equipment speed.
3.Channel and Positioning Design
Employs a sliding channel and multi-row channel design to improve throughput and weighing stability.
4.Rejection and Statistics Functions
Automatically rejects products with unacceptable weight, while simultaneously performing weight distribution statistics and trend feedback to adjust upstream filling processes.
5.Accuracy: ±0.5mg ~ ±3mg.The appropriate range must be selected based on product weight and production requirements.
Sampling Tablets Checkweigher:
Multi-channel Capsule Checkweigher:
When selecting a checkweigher, a comprehensive evaluation is needed, considering factors such as packaging type, dynamic speed, accuracy requirements, and the conveying and rejection system. Different products (boxed, bagged, bottled, single capsules/tablets) have different requirements for checkweighing equipment. Correct technical parameter configuration and manufacturer support are crucial to ensuring consistent packaging efficiency and quality.
If you are interested in our checkweighers, please feel free to contact us.
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