G420 Liquid High-Speed Packaging Machine: How a 5-Servo System Achieves 150 Bags/Min

Introduction: The Demand for High-Speed Liquid Packaging

In today's fast-moving food, condiment, and daily chemical industries, packaging line throughput is a direct competitive advantage. Whether you're filling soy sauce sachets, shampoo pouches, or hot pot base packets, every second of downtime translates to lost output. The G420 Liquid High-Speed Packaging Machine from Keypack Intelligent Technology was engineered to answer this challenge — delivering a stable, verified output of 100–150 bags per minute with precision, reliability, and minimal operator intervention.

This article provides a comprehensive technical breakdown of the G420, a side-by-side comparison with other models in the Keypack VFFS lineup, and guidance on which applications it's best suited for.

What Is the G420? A Quick Overview

The G420 is a Vertical Form-Fill-Seal (VFFS) machine purpose-built for liquid and viscous materials. It forms bags from a roll of composite film, fills them with liquid product, and seals them — all in a single continuous automated process. Key headline specs:

• Packaging Speed: 100–150 bags/min
• Drive System: 5-Servo Multi-Axis
• Control: PLC + Touchscreen HMI
• Vacuum Pump: Japan Koganei
• Power: 3-Phase / 380V / 50Hz
• Machine Weight: 700 kg
• Footprint: 2200 mm (L) × 1200 mm (W) × 1700 mm (H)

5 Core Technical Advantages of the G420

1. 5-Servo Multi-Axis Drive System

Unlike conventional single-motor or dual-servo machines, the G420 uses a 5-axis servo architecture that independently controls film pulling, sealing, cutting, and filling sequences. This eliminates mechanical coupling errors, reduces vibration at high speed, and allows each axis to be tuned independently for different film materials and bag sizes.

2. Intelligent Temperature Control

Sealing quality at 150 bags/min demands millisecond-level thermal precision. The G420's intelligent temperature control system monitors and adjusts sealing jaw temperature in real time, preventing cold seals (leakage risk) and over-seals (burn-through), even when ambient temperature fluctuates on the production floor.

3. Japan Koganei Vacuum Pump

The Koganei vacuum pump ensures consistent suction cup performance for film handling and bag opening. This is especially critical for liquid products where bag mouth alignment directly affects fill accuracy and seal integrity. Koganei's reputation for long service life reduces unplanned maintenance downtime.

4. Touchscreen HMI with Multi-Recipe Storage

Operators can store and recall multiple product recipes — bag size, fill volume, speed, temperature profiles — via the color touchscreen. Changeover between SKUs takes minutes rather than hours, making the G420 suitable for multi-product lines.

5. Built-in Fault Diagnostics & Safety System

The G420 features real-time fault detection with on-screen error codes, automatic stop on abnormal conditions, and independent electrical and pneumatic control cabinets for safer maintenance access. This reduces mean time to repair (MTTR) and keeps OEE high.

G420 vs. Other Keypack VFFS Models: Comparison Table

Choosing the right VFFS machine depends on your target speed, bag size range, and product type. The table below compares the G420 against key models in the Keypack lineup:

Note: Speed varies depending on bag size, film material, and product viscosity. Contact Keypack for application-specific testing.

Application Scenarios: Who Should Choose the G420?

Food & Condiment Industry

The G420 is the go-to choice for high-volume soy sauce, vinegar, oyster sauce, and hot pot base sachet lines. Its anti-drip filling compatibility and precise seal control prevent product contamination and ensure hygienic packaging compliant with food safety standards.

Daily Chemical Industry

Shampoo, body wash, and liquid soap pouches require consistent fill volumes and leak-proof seals. The G420's 5-servo system maintains seal integrity even with viscous, foamy, or temperature-sensitive liquids.

Jam & Paste Products

Peanut butter, fruit jam, and similar paste-type products benefit from the G420's vacuum pump-assisted bag opening and controlled fill speed, which prevents air entrapment and ensures accurate net weight.

Pharmaceutical & Nutraceutical

For liquid supplements, oral solutions, and medical-grade sachets, the G420's intelligent fault diagnostics and recipe management support GMP-aligned production documentation and traceability.

Supported Bag Styles

The G420 supports the following bag formats out of the box, with additional styles available upon request:

• Back-seal bag (pillow bag) — the standard format for most liquid sachets
• Gusseted back-seal bag (插脚背封) — adds side gussets for a more stable standing pouch
• Hang-hole bag — for retail display applications
• Custom bag styles available on request

Integration & Turnkey Line Compatibility

The G420 is designed for seamless integration into complete packaging lines. Compatible upstream and downstream modules include:

• Metering systems: piston fillers, flow meters, peristaltic pumps (matched to product viscosity)
• Conveying systems: vacuum conveying for upstream powder/granule feeding where applicable
• Optional modules: gas flushing/evacuation, date printing (inkjet or thermal transfer), counting, checkweighing

Factory Acceptance Testing (FAT) is available before shipment, and Keypack provides on-site installation, commissioning, and after-sales technical support.

Technical Specifications at a Glance

Is the G420 Right for Your Production Line?

The G420 is the right choice if you need:

• ✅ Output above 80 bags/min for liquid or viscous products
• ✅ 3-phase power infrastructure (380V) already in place
• ✅ Back-seal or gusseted bag formats
• ✅ Multi-SKU production with fast recipe changeover
• ✅ Integration into a turnkey automated packaging line

If your required output is below 80 bags/min or you need single-phase power, the KL420 or KL520 may be a better fit. If you need larger bag formats (up to W400mm), consider the KL820.

📩 Get a Quote or Request a Demo

Ready to evaluate the G420 for your production line? Keypack's engineering team is available to:

• Review your product specifications and recommend the optimal configuration
• Arrange a Factory Acceptance Test (FAT) with your actual product
• Provide a detailed quotation including optional modules and line integration

🔍 View G420 Product Page    📩 Request a Quote