Also: Automatic open mouth bagging machine, FFS bagger, form-fill-seal machine, automatic bag packer
High-speed automatic filling machine for pre-made open mouth bags — PE film, PP woven, and kraft paper. Integrated net weigher, bag presenter, closing system, and conveyor. Used on ENZAC's PETRONAS urea project (20kg and 50kg PP woven, dual-format hybrid line).
An open mouth bagger is an automatic packaging machine that fills pre-made bags — open at the top — with bulk powder, granule, or pellet materials, then closes and seals them. Unlike a valve bag packer (which fills through a pre-formed valve in the bag), the open mouth bagger opens the bag, fills it from above, and closes the top by heat sealing, stitching, or pinch-fold.
ENZAC supplies open mouth baggers as part of complete end-of-line systems — integrated with weighing, bag presentation, conveying, vision inspection, and palletizing. The open mouth bagger is one of the most common equipment types ENZAC commissions, with reference projects in the oleochemical, fertilizer, food, and oil & gas industries.
PETRONAS Project Reference
ENZAC delivered a hybrid open mouth bagging line (20kg and 50kg PP woven bags, dual-format on the same line) as part of the PETRONAS urea bagging rejuvenation project — 3 lines commissioned to PETRONAS PTS standard. Format changeover in under 5 minutes. FAT/SAT completed with zero defects at acceptance.
Key Features
High Speed — Up to 1,200 bags/hr
Semi-automatic: 200–600 bags/hr. Fully automatic with bag presenter: 600–1,200 bags/hr depending on fill weight and bag size.
Accurate Net Weighing — ±50g
Integrated net weigher (gravity feed, screw feed, or belt feed depending on material). Accuracy certified at fill rate, not just static condition.
Versatile Bag Types
PE film, PP woven, laminated PP, and kraft paper bags. Single-format or multi-format (hybrid) in one machine with quick changeover.
Flexible Closing Options
Heat seal (PE/PP film), stitch closing (PP woven), pinch-fold glue (paper). Multiple closing systems can be combined on a single line.
Dust-Free Filling
Integrated dust extraction nozzle at the filling spout. Designed to DOSH atmospheric emission standards for fine powder applications.
PLC Control with Touchscreen
Siemens or Allen-Bradley PLC, 7–10" colour touchscreen HMI. Recipe storage for multiple products. Remote access and SCADA integration available.
VisionGuard™ Integration Ready
ENZAC integrates VisionGuard™ SKU verification and OCR label inspection downstream of the closing station on mixed-SKU bagging lines.
Palletizer Integration
Direct conveyor connection to robotic or conventional palletizer. Bag flattener, checkweigher, and label applicator can all be integrated inline.
Technical Specifications
Semi-Automatic
Fully Automatic
Hybrid Dual-Format
Semi-Automatic Open Mouth Bagger
Throughput
200 – 600 bags/hr (weight & material dependent)
Fill Weight Range
5 kg – 50 kg
Bag Type
PP woven, PE film, kraft paper
Bag Width
350 – 600 mm
Bag Length
500 – 900 mm
Weighing Type
Net weigher (gravity, screw feed, or belt feed — selected by material)
Weighing Accuracy
±50g at 25 kg fills; ±100g at 50 kg fills
Feeding Type
Gravity for free-flowing; screw feeder for cohesive powder; belt feeder for fragile granule
Closing Method
Heat seal (PE/PP film) or stitch closer (PP woven) or pinch-fold (paper)
Bag Insertion
Manual by operator (1 operator per line)
Dust Extraction
Integrated extraction nozzle at fill spout (customer to connect to central dust collector)
Controls
PLC with 7" HMI touchscreen; recipe storage for 20 products
Power
3-phase 415V 50Hz; approx. 3–5 kW
Compressed air
6 bar, 50 Nl/min
Overall dimensions (approx.)
2,000 × 1,200 × 2,400 mm (L × W × H)
Operators required
1 per line (bag loading and monitoring)
ATEX option
Zone 21/22 (dust) on request
Fully Automatic Open Mouth Bagger
Throughput
600 – 1,200 bags/hr (weight & material dependent)
Fill Weight Range
5 kg – 50 kg
Bag Type
PP woven, PE film, laminated PP, kraft paper
Bag Presentation
Automatic bag magazine; picks and opens bag onto filling spout without operator
Weighing Type
Net weigher with pre-feed and fine-feed — faster and more accurate than gross weighing at high speed
Weighing Accuracy
±30g at 25 kg fills at full production speed (net weigher)
Heat seal · Stitch closer · Pinch-fold glue · Or combination (e.g. stitch + heat seal tape)
Label Applicator
Optional inline label applicator (top or side label)
Bag Flattener
Integrated roller-type bag flattener for stable pallet stacking
Reject System
Integrated divert conveyor triggered by checkweigher and/or VisionGuard™ signal
Controls
Siemens or Allen-Bradley PLC; 10" colour HMI; SCADA/OPC-UA integration available
Power
3-phase 415V 50Hz; approx. 7–15 kW
Overall dimensions (approx.)
4,000 – 6,000 × 1,500 × 2,600 mm (line dependent)
Operators required
0–1 per line (monitoring only; bag loading fully automatic)
ATEX option
Zone 21/22 (dust) on request
Hybrid Dual-Format Open Mouth Bagger (PETRONAS Project Configuration)
Format 1
20 kg PP woven open mouth bag
Format 2
50 kg PP woven open mouth bag
Changeover time
Under 5 minutes (recipe change at HMI; automatic bag magazine adjustment)
Throughput (20 kg)
Up to 1,000 bags/hr
Throughput (50 kg)
Up to 600 bags/hr
Weighing Accuracy
±50g at both formats (certified at FAT)
Weighing Type
Dual-stage net weigher (pre-feed + fine-feed) for consistent accuracy across both fill weights
Feeding Type
Screw feeder with VFD control — rate adjusts automatically per format recipe
Closing Method
Stitch closer (PP woven bags); automatic stitch tension adjustment per bag thickness
PLC
Siemens S7-1500 with TIA Portal; recipe management for unlimited formats
SCADA
OEE dashboard, remote access, production report by shift/format
Compliance
Designed and documented to PETRONAS PTS mechanical, control, and safety standards
FAT/SAT
Included — throughput and accuracy KPIs agreed in contract and verified at acceptance
Reference project
National energy corporation urea bagging rejuvenation — 3 lines, Malaysia, 2023
Material Suitability for This Configuration
The dual-format configuration was designed specifically for urea — a hygroscopic, moderately cohesive granule with bulk density ~750 kg/m³ and Carr Index ~15. The screw feeder was selected over gravity feed to maintain consistent fill rate as the material's flowability changes with ambient humidity. If your material has different properties, ENZAC will recalculate the feeder specification accordingly.
Weighing & Feeding Type Selection Guide
Material Characteristic
Recommended Weigher
Recommended Feeder
Reason
Free-flowing granule (CI < 20)
Net weigher — gravity
Gravity chute or slide gate
No mechanical feed needed; material flows by gravity
High momentum makes screw feeder fine-feed difficult at speed
Mixed or alternating materials
Net weigher with recipe management
Multi-speed screw with recipe
Different materials need different feed rates stored per recipe
Watch ENZAC Open Mouth Bagging Systems
ENZAC's YouTube channel features project walkthroughs, equipment demos, and system commissioning videos. Subscribe for updates on bagging, palletizing, and end-of-line automation.
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Partner Demo — Automatic Open Mouth Bagging Machine
ENZAC partners with Alligator Automations — this video demonstrates the automatic open mouth bagging machine technology ENZAC integrates and commissions in Malaysia.
Alligator Automations — ENZAC partner · Automatic open mouth bagging machine for powder and granule materials
Industries & Applications
ENZAC open mouth baggers have been commissioned across Malaysia's process industries. Material suitability is confirmed for each application before machine selection.
Send ENZAC your material data sheet (bulk density, particle size, Carr Index, moisture content) and required throughput. We'll confirm machine suitability and specify the correct weigher/feeder/closing combination within 2 working days. Contact us →
Get a Quote
Tell us your material, fill weight, required throughput, and bag type. We'll specify the right configuration and give you a cost range within 2 working days.
