For chemical, food and pharmaceutical manufacturers handling fine, fluffy bulk powders, 1-50kg big bag packaging has long been plagued by three persistent issues: uncontrolled dust spillage, inconsistent weighing accuracy, and bulky finished bags from trapped air. Traditional open-filling packing machines not only create poor workshop conditions and material waste, but also lead to frequent quality deviations and downstream palletizing problems.
The UF-P5 PRO vertical screw powder weighing packing machine is engineered to solve these exact pain points. It combines vertical screw feeding, servo-driven submerged filling, and precision weighing control into one integrated system, delivering dust-free operation, ±0.1% weighing accuracy, and stable performance for 1 to 50kg bulk powder packaging.
Core Pain Points of Traditional Bulk Powder Packaging
Before diving into the machine’s design, it helps to understand why standard packing systems struggle with light, dusty powders:
- Dust overflow: Open filling creates heavy dust blowback from the bag, polluting the workshop and wasting raw material
- Weighing inaccuracy: Material inertia and residual drop after feed stop cause consistent over-weight or under-weight errors
- Material bridging: Horizontal screw feeders easily jam with light, fluffy powders, leading to uneven flow
- Poor efficiency: Manual adjustment and frequent cleaning slow down production changeovers
The UF-P5 PRO addresses every one of these issues through targeted structural design.
1. Vertical Screw Feeding System: Stable Flow & Reliable Metering
At the heart of the machine is its vertical screw feeding assembly, which outperforms traditional horizontal screw designs for light, dusty, and easily bridged powders.
The feeding unit connects to the upper storage hopper via a connecting flange, and consists of the hopper body, screw conveyor, conical discharge valve, drive motor, and automatic arch-breaking device. It operates in two feeding modes:
- Fast feeding: Maximizes packaging speed for the bulk of the fill cycle
- Slow feeding: Takes over for the final ~15% of the target weight to ensure precise metering
A pneumatic conical valve is installed at the screw outlet. When feeding stops, the valve closes immediately to cut off material flow completely, preventing residual material from falling into the bag and causing weight deviations.
An integrated arch-breaking device activates automatically during feeding, eliminating powder bridging at the hopper outlet that would otherwise disrupt consistent flow and weighing accuracy.
For long-term reliability, the screw bearings use imported SKF brand bearings in an externally mounted design. This prevents powder leakage from entering the bearing and causing seizure, delivering a service life of no less than 8,000 hours under normal operating conditions.
2. Servo Lifting Submerged Filling: Minimize Dust & Stabilize Accuracy
The most distinctive feature of the UF-P5 PRO powder weighing packing machine is its servo-driven bag lifting system, which enables submerged filling to control dust at the source and improve weighing stability.
During the filling cycle, the servo motor drives the weighing platform upward to position the bag just 10cm below the discharge valve. After tare weighing, filling begins. As powder accumulates inside the bag, the clamp and bag assembly lowers at a constant speed, keeping the filling outlet close to the material surface throughout the process.
This design delivers two key benefits:
Drastically reduced dust generation
By shortening the material free-fall distance, submerged filling eliminates the heavy dust blowback that is common with traditional top-down filling. This keeps the bag mouth area clean and reduces workshop dust levels dramatically.
Consistent weighing precision
The servo-driven lifting motion works in tandem with the weighing system to reduce the impact of falling material on the weighing signal. Combined with real-time feedback from the load cell, the system maintains a weighing accuracy of ±0.1%, even for light, fluffy powders.
The bag clamp assembly uses silicone sealing elements and AIRTAC pneumatic components, supporting manual bag placement and automatic release with a tight, dust-tight seal. The lifting mechanism consists of motor, reducer, counterweight, chain and guide assembly for smooth, reliable operation.
3. Intelligent Weighing & Control System
The UF-P5 PRO is a new generation of intelligent powder packing machine, built on electronic weighing principle and full PLC control.
Key control and weighing features:
- Real-time load cell feedback with automatic error correction for material density and hopper level changes
- Servo motor driven screw feeding, with faster response and 30% higher speed than stepper motor systems
- Independent suspension load cell for stable signal transmission and reliable weighing
- LCD touch screen HMI for easy parameter setting and operation monitoring
- Automatic tare weighing and cycle repeat for continuous production
The system also supports manual operation mode, allowing independent control of screw feeding, valve actuation, bag clamping and release via the control panel — ideal for setup, testing and product changeovers.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Weighing range | 1 – 50 kg |
| Weighing accuracy | ±0.1% |
| Filling speed | 0.5 – 1 cycle/min (varies by material density and package weight) |
| Control system | SIEMENS PLC + touch screen HMI |
| Hopper volume | 100L, open-view design |
| Power supply | AC 380V, 50Hz, 2.2kW |
| Air consumption | 1m³/h |
| Air pressure requirement | 0.4 – 0.6 MPa |
| Overall dimensions (L×W×H) | 950 × 1100 × 3200 mm |
Main Component Configuration
| Component | Model | Brand |
|---|---|---|
| HMI | SMART LINE | SIEMENS |
| PLC | S7-200 SMART | SIEMENS |
| Frequency inverter | MD600S | INOVANCE |
| Servo motor | MS1H8 | INOVANCE |
| Precision planetary reducer | ZLDPLF | Zhuolan |
| Weighing sensor | 150kg | METTLER TOLEDO |
| AC contactor | LC1N | Schneider |
| Pneumatic cylinder | MAL32×75 | AIRTAC |
| Solenoid valve | 4N210 | AIRTAC |
| Main frame | SUS304 stainless steel | VTOPS |
Ideal Applications
This vertical screw powder packing machine is suitable for a wide range of fine, dusty, and fluffy bulk powders across industries:
- Chemical powders: carbon powder, carbon black, silica, pigment powder
- Food powders: flour, milk powder, seasoning powder, coffee powder
- Pharmaceutical and nutraceutical powders
- Other light, easily dusted bulk materials
Final Thoughts
For 1-50kg bulk powder packaging, the difference between a high-efficiency line and a problematic one comes down to feeding stability, dust control, and weighing consistency.
The UF-P5 PRO vertical screw powder weighing packing machine solves all three core issues through its vertical screw design, servo submerged filling, and precision weighing system. It not only improves production efficiency and product quality, but also creates a cleaner, safer workshop environment.
If you are looking for a reliable powder packing solution for your bulk bag line, or need to upgrade an existing system with dust and accuracy problems, our team can evaluate your material and production requirements and recommend the optimal configuration. Contact us today for a detailed quotation and solution proposal.