The working principle of multi-head weigher

Multi-head weighers, also known as combination scales, represent the gold standard in automated weighing technology for modern packaging lines across food, pharmaceutical, and industrial sectors. For those implementing their first automated packaging solution or upgrading from semi-automatic equipment, understanding this sophisticated technology is crucial for optimal implementation.

Core Operational Mechanism

At its fundamental level, a multi-head weigher performs precision portioning of bulk materials according to pre-programmed weight parameters in its control system. The weighing process follows this meticulous sequence:

1. Product Infeed Stage

   • Bulk product enters through the top-mounted feed hopper

   • Typically supplied via inclined conveyor or bucket elevator systems

   • Specialized vibratory feeders ensure consistent material flow

2. Distribution Phase

   • The central dispersion cone and radial feed pans utilize controlled vibration

   • Product gently cascades outward toward perimeter-mounted weigh buckets

   • Advanced algorithms adjust vibration patterns based on product characteristics

3. Precision Weighing

   • Each weigh bucket contains an independent high-precision load cell

   • Continuous real-time weight measurement occurs during filling

   • Multiple buckets simultaneously accumulate product while maintaining individual weight data

Customizable Configuration Options

Modern multi-head weighers offer extensive adaptability:

Surface Engineering:

• Dimpled stainless steel contact surfaces minimize product adhesion

• Special coatings available for sticky products (e.g., gummies, pastes)

• Anti-static treatments for powdered substances

Bucket Specifications:

• Variable bucket sizes tailored to product dimensions

• Larger buckets for bulky items or big packaging formats

• Smaller buckets for fine materials or small portion sizes

• Quick-change systems for rapid format conversion

Intelligent Combination Logic

The system’s computer analyzes all possible bucket combinations in milliseconds:

1. Continuously monitors weight in all active buckets

2. Calculates every potential combination sum

3. Selects the optimal group that achieves target weight with minimal variance

4. Triggers discharge of selected buckets into packaging machine

Performance Advantages

• Speed: Typically 60-120 weighments per minute

• Accuracy: ±0.1-1g depending on product and configuration

• Flexibility: Handles products from 1g to 5kg portions

• Efficiency: Reduces giveaway while maintaining strict weight compliance

This sophisticated weighing technology enables packaging operations to achieve unprecedented levels of speed, accuracy, and consistency while minimizing product waste. Proper selection and configuration of a multi-head weigher system can significantly enhance packaging line performance and profitability.