2.5kg Frozen French Fries: End-to-End Automation for High-Volume Bulk Packaging

1. Project Overview

Our client required a complete turnkey packaging solution for **2.5kg commercial frozen french fries**—one of the most demanding bulk-food applications. The target capacity was an impressive **6 tons per hour**, requiring seamless automation across weighing, packaging, quality inspection, flattening, cartoning, coding, and palletizing.

Below is the reference factory layout we engineered for this project.

Engineering reference layout of the complete 2.5kg frozen fries packaging line.

Secondary layout showing the full line footprint and equipment positioning.

2. Key Packaging Challenges

Frozen french fries in 2.5kg bulk bags present a unique combination of difficulties that standard packaging lines cannot handle:

• Speed vs. Seal Integrity: Most clients use PE bags, which dramatically slow down packaging and frequently result in poor sealing and broken bags.
• Fragile Product Shape: Long, brittle fries break easily during handling, leading to inconsistent distribution inside the bag and an uneven, lumpy appearance.
• Cartoning Complexity: The soft, deformable bags cause major headaches in cartoning—bags snag, tear, or stack crookedly inside the carton.

3. Complete Process Workflow

We designed a fully integrated production line covering every stage:

• Material Conveying → Multi-Head Weigher → VFFS Bag-Making & Air Evacuation → Metal Detection → Weight Sorting → Bag Flattening → Automatic Case Erecting → Automatic Case Packing → Case Sealing → Final Weight Check → Online Inkjet Coding → Robotic Palletizing

4. Core Engineering Solutions

High-Precision Weighing

For 2.5kg accuracy, the standard 10-head weigher is insufficient. We deployed a **14-head weigher with a 5.5L bucket** (or a 16-head 5.5L configuration for even greater precision) to handle the large volume per drop while maintaining tight weight tolerance.

14-head weigher with 5.5L buckets - the foundation of high-accuracy bulk weighing.

VFFS Packaging Optimized for PE Bags

To solve the PE bag sealing problem, we integrated a complete set of custom modules:

• Air Evacuation Mechanism: Actively removes excess air before sealing.
• Bag-Flipping Device: Guarantees the printed side faces up when the bag exits the machine.
• Waterproof Electrical Cabinet: Critical for the cold, humid freezing environment.
• Micro-Perforation Device: Creates tiny vent holes for trapped air to escape during the evacuation process.

VFFS machine with air evacuation, bag-flipping, and waterproof cabinet modifications for low-temperature PE bag packaging.

Dual Quality Inspection

Every bag passes through **metal detection** to eliminate foreign object contamination, followed by **weight sorting** to reject any out-of-spec bags before they enter the cartoning stage.

Metal detector and checkweigher working in tandem for dual quality assurance.

Bag Flattening & Shaping — A Critical Step

This is one of the most crucial—and often overlooked—stages. We designed a **square-tube vibrating conveyor** system that gently flattens and distributes the fries uniformly inside each bag. This step is the foundation for clean, stable cartoning and palletizing downstream.

Square-tube vibrating conveyor for uniform bag flattening and product distribution.

Automatic Cartoning — The Hardest Challenge

Cartoning soft, deformable 2.5kg bags without snagging, tearing, or misalignment requires careful selection of insertion method. We offer three proven options depending on the actual product samples, carton size, and throughput requirements:

• Flexible Side-Push Packing: Ideal for uniform, flat bags.
• Drop-Style Packing: Suited for stable, forgiving bag shapes.
• Robotic Arm Packing: Maximum flexibility for delicate or irregular products.

Automatic case erecting station preparing empty cartons.

Side-push style bag insertion into carton.

Drop-style bag insertion into carton.

Robotic arm bag insertion for maximum handling care.

Coding & Robotic Palletizing

After sealing, cartons pass through a final weight check before receiving an **online inkjet code**. A **collaborative palletizing robot** then stacks finished cartons at speeds up to **9 cases per minute** (within the 20kg payload range).

Inkjet coding station applying batch and date codes to sealed cartons.

5. Project Summary & Replicable Value

This project delivered two lasting engineering values for our client:

• Optimized Line Layout: The walkway and equipment arrangement were specifically designed for freezer environments and operator ergonomics.
• A Replicable Template: The same architecture can be deployed across virtually any **bulk soft-bag frozen food** category—frozen strips, frozen dumplings, frozen blocks, and similar products requiring 1–5kg large-format packaging.

Collaborative palletizing robot stacking finished cartons at the line output.

Need a Complete Bulk-Food Packaging Line?

From individual weighing heads to full robotic palletizing, we engineer and integrate every stage of your frozen food packaging line. Contact us to discuss your capacity targets and product specifications.