Doug Strong

Pharmaceutical Business Development Manager

Product Overview

A multi-lane checkweigher is a weighing system featuring multiple independent conveyors—typically ranging from 2 to 12 lanes—each equipped with its own load cell, operating speed, and reject mechanism.

Unlike conventional checkweighers, multi-lane systems can weigh and classify multiple products simultaneously while maintaining control of all channels through a unified interface. Each lane can be individually configured for different products and weight ranges and is integrated with a reject system that classifies products in good, underweight and overweight.

Core Applications

The applications that benefit the most from multi-lane checkweighers are small products in stick packs or sachets, as well as composite products. In pharmaceutical and related industries, these systems are particularly valuable for:

• Dual-chamber sachets containing combinations like antibiotics and probiotics
• Transdermal patches requiring precise dosing verification
• Multi-component sachets such as two-capsule packages
• Nutraceutical products including vitamin blends and specialized health supplements
• CBD formulations with precise dosage requirements

Benefits of Multi-Lane Checkweighing

One of the key advantages of multi-lane checkweighers is increased throughput. Stick pack machines typically operate with 10 or 20 parallel lanes, making a conventional single-lane checkweigher impractical or inefficient. A multi-lane checkweigher allows manufacturers to process all lanes simultaneously without reducing line speed.

However, benefits go beyond just speed:

• Improved quality control
  Even by using a single-lane checkweigher that can keep up with a multi-lane filler—such as Anritsu's latest AW9 Series Ultra-Fast Type, which can process up to 1,000 products a minute on a single conveyor—multi-lane systems offer better quality control. Instead of pushing a single conveyor at 1,000 feet per minute, manufacturers can achieve the same throughput by running each lane at 100 feet per minute. The lower speed allows for easier product handling and significantly improved weighing accuracy.
  
  
• Improved yield through precise feedback
  Checkweighing systems typically have a controller that sends feedback to the filling packaging machine helping to prevent under or overfilling and improve yield. When using a single-lane checkweigher in a multi-lane setup, this feedback is limited. In contrast, a multi-lane system allows for individual feedback control for each lane, ensuring greater precision and efficiency.
  
  
• More efficient product handling
  With multi-lane checkweighers, products move seamlessly from one conveyor to another while maintaining their original lane positions. This eliminates the need to merge multiple lanes into a single one, which would require a dramatic speed increase. By preserving lane integrity, this approach simplifies product transfer, reduces handling errors, and minimizes the risk of product damage.
  
  
• Faster changeovers
  Multi-lane checkweighers dramatically simplify the changeover process. Instead of managing multiple checkweighers, operators use a single HMI (HumanMachine Interface) for programming and recipe adjustments. With six individual checkweighers, a change from one-ounce to two-ounce products would require programming each unit separately. A multi-lane solution eliminates this redundancy—one adjustment on a single HMI updates all lanes, reducing changeover time and minimizing the risk of programming errors.
  
  
• Space and cost savings
  A multi-lane solution significantly reduces both floor space and costs compared to multiple single-lane units. For example, a six-lane checkweigher might cost $180,000, whereas purchasing six individual checkweighers for the same application could total $250,000. The compact design also optimizes facility layout, freeing up valuable production space.
  
  

Key Features to Look for in a Multi-Lane Checkweigher

If you're considering adding a multi-lane checkweigher to your production line, keep these essential features in mind:

• High-speed precision weighing capabilities
  Choose systems offering superior weighing precision while maintaining high throughput. Look for models with accuracy around ±0.010 grams and scale intervals of 0.01 grams, capable of processing 150-200 products per minute per lane. Advanced vibration resistance technology is also crucial for maintaining accuracy, even with unstable products.
  
  
• Ability to integrate with production lines
  Select a checkweigher with center pitch dimensions that match your filling machines, eliminating the need for additional spreading conveyors or complex product handling. The best systems accommodate center pitches as narrow as 50–80 mm, enabling direct connection to multi-lane fillers without disrupting product flow.
  
  
• Ability to integrate with other inspection equipment
  Opt for a model that integrates with multi-lane X-ray inspection systems, creating a comprehensive quality control checkpoint without increasing your production footprint. This combination ensures both weight verification and internal integrity inspection in a single, space-efficient solution.
  
  
• Regulatory compliance
  Look for built-in functionality that satisfies FDA requirements and GMP procedures without requiring additional customization. Key compliance features should include:
  • Authenticated user access with unique identification controls.
    
  • Comprehensive audit trails generating time-stamped records of all operator actions.
    
  • Robust data management systems to maintain electronic records in their original form throughout the retention period.
    
  • Production analysis capabilities with OEE tracking to support inspection readiness.
    
  
  
  

Conclusion

Anritsu’s next-generation multi-lane checkweighers offer all these features as standard, with 150 models and up to 12 independent lanes to accommodate a wide range of production line applications. For pharmaceutical manufacturers using multi-lane filling systems—such as those for sachets, stick packs, and capsule packages—this technology enhances quality assurance, operational efficiency, and regulatory compliance.