Keypack Intelligent Fully Automatic Powder Weighing Production Line For Large Bag is a high-precision automatic weighing and pre-made bag filling system engineered for continuous, dust-free packaging of powdered materials in food, pharmaceutical, and chemical industries. It delivers up to 200 bags per hour with a bag clamp capacity of 25 kg, driven by a new-generation PLC control system and built with SUS304 stainless steel on all product-contact surfaces with polished finish. Ideal for milk powder, health-care powder, solid beverages, food additives, and solid pharmaceutical powder requiring reliable big-bag automatic weighing line solutions.
Product Overview
The Fully Automatic Powder Weighing Production Line For Large Bag is a purpose-built automatic weighing line designed for high-volume, pre-made open-mouth bag filling of fine powder materials. Unlike small-sachet VFFS machines, this system is engineered specifically for large-format open bags — handling bag sizes from 750–950 mm (L) × 400–550 mm (W) with a bag clamp load capacity of 25 kg — making it the ideal solution for producers requiring big-bag powder packaging with consistent fill accuracy and dust-free operation.
The production line integrates automatic bag feeding, gripping, opening, powder filling, air exhaust, and sealing into a single continuous automated process. Adopting a new-generation production control system paired with a high-precision, high-speed dedicated metering controller, the line delivers strong functionality, high reliability, and excellent scalability — fully adapting to the demands of continuous production in food-grade, pharmaceutical-grade, and industrial powder packaging environments.
Equipped with Keypack Intelligent (Kunbupack) automatic weighing line control architecture, the system supports both automatic and manual operation modes with self-locking logic, real-time operation monitoring, PLC I/O point comparison, and PLC backup point replacement — ensuring maximum uptime and production continuity for multi-shift powder packaging operations. All product-contact parts are manufactured from SUS304 stainless steel with surface polishing treatment, meeting GMP standard requirements for dust-free powder handling.
Technical Specifications
| Bag Clamp Load Capacity |
25 kg |
| Bag Size Range |
750–950 mm (L) × 400–550 mm (W) × 0–100 mm (gusset) |
| Bag Style |
Open-mouth bag (pre-made) |
| Bag Feeding Speed |
Up to 200 bags/hour (actual speed subject to customer's auger discharge rate) |
| Product-Contact Material |
SUS304 stainless steel, surface polished |
| Frame Material |
High-quality carbon steel with powder coating |
| Power Consumption |
3.5 kW |
| Machine Weight |
Approx. 3,000 kg |
| Control System |
PLC system with touchscreen interface |
| Minimum Air Pressure |
0.40 MPa (auto-stop below this threshold) |
Key Features and Machine Characteristics
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Automatic / Manual Mode with Self-Locking: Supports seamless switching between automatic and manual operation modes. Manual mode is used for maintenance, commissioning, or emergency handling; automatic mode drives normal continuous production — ensuring operational flexibility across all production scenarios.
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PLC I/O Point Comparison Function: The control system provides detailed I/O point mapping, allowing operators to identify the specific function of each PLC output point — simplifying troubleshooting and reducing maintenance downtime on the automatic weighing line.
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Real-Time Operation Monitoring: Integrated operation monitoring system continuously supervises equipment status in real time, ensuring stable and reliable performance throughout continuous powder packaging production.
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PLC Backup Point Replacement: The system supports flexible reassignment of PLC output points, enabling rapid fault recovery without production line shutdown — maximizing uptime for high-volume powder packaging operations.
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Multi-Level Safety Protection with Fault Alarm: Multiple safety devices are installed throughout the production line. Upon fault detection, the system immediately triggers an audible alarm and the operation interface pinpoints the fault location — protecting operators and ensuring GMP-standard safe operation.
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Photoelectric Bag Detection in Bag Magazine: The bag feeding system uses photoelectric sensors to detect bag availability. When no bags are detected in the magazine, the system alarms and stops immediately, preventing empty-cycle operation and material waste.
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Air Pressure Monitoring with Auto-Stop: Continuous air pressure monitoring protects the system. When air pressure drops below 0.40 MPa, the machine automatically alarms and stops to safeguard both operators and equipment integrity.
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Guide Rod Air-Exhaust Structure: Guide rods mounted on the bag conveying rail compress and exhaust air from filled bags before sealing. Rod height is adjustable according to bag volume and dimensions, ensuring consistent bag appearance and seal quality for big-bag powder packaging.
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Full-Process Air Pressure Detection with Auto-Rejection: Air pressure is monitored throughout the entire bag feeding, gripping, and opening process to ensure a high bag-feeding success rate. Abnormal empty bags are automatically rejected without interrupting production.
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Safety Door with Interlock Switch: A safety door with integrated safety switch is installed on the production line. Opening the door during operation immediately triggers an alarm and emergency stop, meeting enterprise safety management requirements.
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SUS304 Stainless Steel with Polished Contact Surfaces: All product-contact parts are manufactured from SUS304 stainless steel with surface polishing treatment, ensuring dust-free powder handling, corrosion resistance, and compliance with food safety and pharmaceutical hygiene standards.
Application Areas
Food Industry — Powder Materials:
- Milk powder big-bag automatic weighing and filling: whole milk powder, skimmed milk powder, and full-cream milk powder for bulk retail and food service big-bag packaging
- Soybean powder and plant protein powder: bulk powder filling into pre-made open-mouth bags for food processing and ingredient distribution
- Health-care powder and nutritional supplement powder: functional powder blends for health food retail and e-commerce big-bag packaging
- Solid beverage powder: instant drink mix and meal replacement powder for bulk production line filling and big-bag distribution packaging
- Food additive powder: starch, thickener, emulsifier, and flavoring powder for food manufacturing ingredient big-bag filling
Pharmaceutical Industry — Powder Materials:
- Solid pharmaceutical powder: antibiotic powder, vitamin supplement powder, and probiotic powder for GMP-standard big-bag bulk packaging
- Traditional Chinese medicine powder: herbal extract powder and concentrated TCM formulation powder for pharmaceutical bulk bag filling
- Oral rehydration salts and electrolyte powder: medical nutrition powder for pharmaceutical and health food big-bag production line packaging
Chemical and Industrial — Powder Materials:
- Industrial chemical powder: specialty chemical powder for single-use portion and bulk distribution big-bag packaging
- Water-soluble fertilizer powder: agricultural chemical powder for precise big-bag filling and retail distribution packaging
Material Compatibility:
- Free-flowing dry powder materials suitable for auger or volumetric metering discharge
- Fine to medium particle size powders without large agglomerates or fibrous content
- Low-moisture powder formulations compatible with open-mouth bag filling and sealing
- Not recommended for: sticky or high-moisture powders, powders with large granule chunks, or highly abrasive materials without custom metering configuration
Customization and Optional Configurations
The production line can be configured with corresponding metering systems and conveying systems according to specific powder properties and filling requirements. The system supports integration with auger screw fillers, vacuum powder conveyors, nitrogen flushing modules for oxidation-sensitive powders, and advanced coding systems for batch traceability. Material contact parts are manufactured from SUS304 stainless steel as standard, with upgrade options available for specific powder formulations upon consultation.
Delivery and Support
Keypack Intelligent provides comprehensive installation, commissioning, and operator training services for big-bag powder packaging applications. The Fully Automatic Powder Weighing Production Line comes with standard warranty coverage, spare parts availability, and dedicated technical support to ensure continuous production uptime. Delivery timelines and customization options are available upon consultation to meet specific automatic weighing line requirements and production capacity needs.
