Background

A chocolate manufacturer producing individually packed chocolate pieces for retail markets faced increasing quality pressure from distributors and brand owners. Each pack was designed to contain a fixed number of chocolate pieces, and even a single missing piece could lead to customer complaints, loss of trust, and potential regulatory issues.
With growing demand, the production line was operating at high speed up to 130 packs per minute, making manual inspection or random sampling ineffective without a Checkweigher.


The Challenge

The customer identified several key challenges:

• Occasional missing chocolate pieces inside sealed packs that required Checkweigher detection

 

• Visual inspection unable to detect internal count errors

 

• High production speed of 130 packs/min, limiting inspection options

 

• Risk of underfilled packs reaching the market without Checkweigher verification

 

• Need to maintain product quality without slowing production

The quality team required a 100% in-line inspection solution capable of operating reliably at high speed, which led to the implementation of a Checkweigher.


The Solution: High-Speed Checkweigher System


The manufacturer implemented a high-speed in-line Checkweigher after the packaging process.

Why a Checkweigher?

Each chocolate piece has a consistent weight. By verifying the total pack weight, the checkweigher could immediately identify:

• Packs with missing chocolate pieces (underweight) detected by the Checkweigher
   
• Packs with extra pieces or packaging anomalies (overweight) detected by the Checkweigher

The system was designed to handle 130 packs per minute without compromising accuracy.



System Configuration

• High-precision load cell optimized for lightweight products in the Checkweigher
  
  
   
• Dynamic weighing suitable for high conveyor speeds using the Checkweigher
  
  
   
• Automatic reject mechanism in the Checkweigher for non-conforming packs
  
  
   
• Clear pass/fail indicators from the Checkweigher for operators
  
  
   
• Data logging by the Checkweigher for quality records and audits

Implementation Process

Step 1: Defining Weight Tolerances

• Established nominal pack weight based on correct piece count
• Set tight upper and lower control limits in the Checkweigher to detect single-piece loss

Step 2: Line Integration

• Installed the Checkweigher directly after flow-wrapping
• Synchronized with upstream packaging equipment
• Verified stable performance at 130 packs/min

Step 3: Validation and Training

• Conducted validation using test packs with intentionally missing pieces
• Trained operators on Checkweigher system operation and reject handling

Results & Benefits

1. 100% Detection of Missing Pieces

• Underweight packs caused by missing chocolates were consistently identified by the Checkweigher
• No defective packs passed undetected

2. Maintained High Production Speed

• Reliable inspection at 130 packs per minute with the Checkweigher
• No impact on production line efficiency

3. Reduced Customer Complaints

• Significant drop in complaints related to underfilled packs after installing the Checkweigher
• Improved brand trust and consumer satisfaction

4. Improved Process Control

• Weight trend data highlighted from the Checkweigher highlighted upstream feeding inconsistencies
• Enabled faster corrective actions

Key Takeaways

• Checkweighers are highly effective for piece-count verification via weight
• High-speed inspection is achievable without sacrificing accuracy
• Early detection protects brand reputation and reduces costly rework

Conclusion
By implementing a high-speed Checkweigher, the chocolate manufacturer successfully ensured that every pack contained the correct number of chocolate pieces even at 130 packs per minute. The solution delivered 100% inspection, zero missing-piece incidents, and improved customer confidence, proving that checkweighers are a powerful quality control tool for confectionery production lines.