Four-Side Sealing Bag Machine | High-Quality Packaging Machine
Engineered for maximum hermetic sealing integrity, ultra-fast multi-lane output, and extreme dosing accuracy. Discover next-generation automation designed for powder, granule, liquid, paste, and single-use hygienic products across global pharmaceutical, food, chemical, and cosmetic industries.
30+
Years Industry Heritage
20,000㎡
Modern Production Facility
100+
Global Export Countries
50+
Smart Packaging Models
What Is a Four-Side Sealing Bag Machine?
A four-side sealing bag machine is a specialized high-speed packaging system engineered to produce flat sachets and pouches hermetically sealed along all four perimeter edges. Unlike conventional back-seal (pillow pack) or 3-side seal configurations, the four-side seal geometry provides unrivaled barrier integrity, optimal aesthetic presentation, superior flatness for retail displays, and maximize protection against moisture, light, and oxygen transmission.
Modern automated 4-side seal systems utilize dual-reel film unwinding or single-reel slit mechanisms synchronized with high-precision multi-lane filling units. Whether packaging sensitive pharmaceutical powders, active nutraceutical granules, viscous cosmetic lotions, or corrosive liquid chemicals, Ludyway’s four-side seal platforms ensure tight weight repeatability, robust hermetic joint strength, and high throughput exceeding 600 pouches per minute.
Quad-Seal Perimeter Structural Rigidity
The uniform four-sided heat sealing eliminates weak corner points and film stress concentrations, guaranteeing long shelf-life and meeting stringent cGMP & FDA sterile barrier mandates.
Servo-Driven Multi-Lane Scalability
Independent servo motion controllers govern film feeding, continuous longitudinal sealing, cross-sealing, and cutting dies, enabling continuous high-speed lane scaling from 2 up to 16 lanes per machine.
High-Performance Four-Side Seal Packaging Models
Explore our industry-proven multi-lane four-side sealing bag machines, engineered for high-precision volumetric, auger screw, and liquid piston dosing with seamless line integration.
Multi-Lane Sachet Packaging Machine for Powder Granule Liquid Filling
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Multi-Lane Stick Pack & Sachet Packaging Machine for Granule, Powder, Liquid
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Instant Noodle Seasoning Packaging Machine for Sachets, Multi-Lane Granule & Powder Filling
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Cosmetic Sachet Packaging Machine for Powders & Liquids – Multi-Lane Automated System
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Ketchup Sachet Packaging Machine | High-Speed Multi-Lane Liquid Packer
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Pharmaceutical Sachet Packaging Lines for Granules & Powder Multi-Lane
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High-Speed Multi-Lane Sachet Packaging Lines for Granules & Powder
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High-Speed Medical Sachet Packaging Machine for Powders & Granules
View SpecificationsIndustrial Mechanics of Four-Side Seal Bag Machines
Achieving leak-proof pouch integrity at massive speeds requires an integrated system of multi-axis servo motion, thermal dynamic heat bars, and smart dosing automation.
1. Dual Web Film Unwinding & Slitting
Utilizes motorized unwind shafts equipped with electro-pneumatic tension feedback and auto-centering ultrasonic web-edge guidance (EPC) to ensure zero film tracking error during continuous high-speed runs.
2. Independent Heated Sealing Blocks
PID temperature regulation delivers precise, localized thermal conductivity with specialized seal patterns (diamond, linear, cross-hatch) to accommodate OPP/PE, PET/AL/PE, Paper/PE, and biodegradable barrier laminates.
3. Specialized Multi-Head Dosing Assemblies
Modular dosing heads allow rapid interchangeability between servo-driven multi-lane auger fillers (fine powders), servo piston pumps (viscous sauces & creams), and multi-cup volumetric feeders (granules).
4. Intelligent Gas Flushing ($N_2$ Inerting)
Integrated nitrogen injection manifolds reduce residual oxygen levels below 1.0% inside each sachet, substantially prolonging the shelf stability of active probiotics, instant coffee, and perishable oils.
5. High-Precision Laser & Rotary Cutters
Offers custom programmable cutting styles: straight flat cut, zigzag tear cut, micro-perforation, easy-open tear notch punch, hanging euro-hole punches, and multi-sachet strip chain perforation.
6. Smart Vision Quality Control & Rejection
Integrated high-resolution vision inspection cameras scan every sachet for seal integrity, code presence, and fill completeness, actuating ultra-fast pneumatic blow-off ejectors for defective units without line stoppage.
Technical Comparison Matrix Across Lane Configurations
Ludyway engineers tailor the lane count, sealing stroke geometry, and dosing pump mechanisms according to your specific production throughput and bag dimension requirements.
| Parameter / Feature | 2-4 Lane Compact Series | 6-8 Lane High-Speed Series | 10-16 Lane Ultra Production Series |
|---|---|---|---|
| Production Output | 60 – 180 bags/min | 240 – 480 bags/min | 500 – 800+ bags/min |
| Sachet Width Range | 30mm – 110mm | 25mm – 70mm | 20mm – 45mm |
| Sachet Length Range | 40mm – 180mm | 40mm – 160mm | 40mm – 140mm |
| Dosing Range (Powder/Liquid) | 0.5g – 100g / 1ml – 100ml | 0.5g – 30g / 1ml – 30ml | 0.2g – 15g / 0.5ml – 15ml |
| Dosing Accuracy | ≤ ±1.0% (Material Dependent) | ≤ ±0.8% – 1.0% | ≤ ±0.5% – 0.8% |
| Film Roll Max Outer Dia. | ∅ 400mm | ∅ 500mm | ∅ 600mm with Dual Splicer |
| Control Architecture | Siemens / Omron PLC + HMI | Full Multi-Axis Servo + EtherCAT | Bus-Controlled Synch + AI Diagnostics |
| Pneumatic & Power | 3.5 kW / 0.6 MPa (0.3m³/min) | 7.5 kW / 0.6 MPa (0.5m³/min) | 12.0 kW / 0.6 MPa (0.8m³/min) |
| Main Construction | SUS304 / Contact SUS316L | Full Sanitary SUS304 / SUS316L | cGMP Cleanroom Mirror Finish 316L |
Global Industry Applications
Four-side seal bag machines represent the gold standard across demanding industries requiring aesthetic excellence, precise dosing, and impervious environmental barriers.
Food & Beverage
Instant coffee powder, drink mixes, bouillon granules, tea powders, spices, ketchup, honey, mustard, and chocolate syrups in leak-proof single-serve sachets.
Pharmaceuticals
Oral rehydration salts (ORS), acetaminophen granules, pediatric suspensions, antacid liquids, effervescent powders, and sterile medical consumables.
Cosmetics & Skincare
Anti-aging serums, trial shampoos, skin conditioners, facial mask essences, travel sunscreen lotions, foundation creams, and hand sanitizers.
Chemical & Hygiene
Descaling powder, concentrated liquid laundry detergent, pesticide granules, automotive lubricants, solvent pads, and industrial wipe packaging.
State-of-the-Art Factory & International Certifications
With over 30 years of engineering legacy, Ludyway operates a modern 20,000㎡ manufacturing base equipped with 200+ high-precision CNC machining centers, fully certified under CE, ISO9001, and cGMP international standards.
CE Quality Certified
ISO9001 Management System
Safety Conformity
cGMP Standard Certified
Worldwide Exhibitions & Global Enterprise Partners
Ludyway regularly presents revolutionary packaging machinery at leading international expos, including Interpack, ProPak, IPACK-IMA, and ALL4PACK, delivering turn-key automated lines to multinational corporations worldwide.
How to Select the Right Four-Side Sealing Bag Machine
Investing in high-speed pouch automation requires evaluating product viscosity, bulk density, film barrier chemistry, and secondary cartoning integration.
1. Product Rheology & Dosing System Match
Selecting the appropriate dosing engine is essential for minimizing downtime and preventing sachet seal contamination:
- Free-Flowing Granules: Multi-lane volumetric cup fillers or electronic combination weighers ensure rapid gravity filling without particulate breakage.
- Non-Free-Flowing Fine Powders: Multi-axis independent servo auger screws with vacuum de-aeration provide precise volumetric displacement and dust suppression.
- Viscous Liquids & Pastes: Rotary valve piston pumps with anti-drip shutoff nozzles prevent product tailing on cross-seal seams.
2. Packaging Film Substrate & Barrier Properties
The machine’s thermal sealing blocks must accommodate your specified laminate composition:
- Aluminum Foil Laminates (PET/AL/PE): Require stable high-pressure heated dies to achieve total hermetic seals for sensitive pharmaceuticals.
- Recyclable Mono-Materials (Pure PE or PP): Need ultra-precise PID temperature windows to avoid film distortion and burn-through.
- Paper-Based Laminates: Require specialized sealing jaw knurling to distribute pressure uniformly without tearing fibrous layers.
3. Upstream & Downstream Line Integration
Maximize OEE (Overall Equipment Effectiveness) by connecting the 4-side seal unit into a continuous turnkey line:
- Infeed Systems: Vacuum powder feeders or jacketed liquid holding tanks with automatic level detection.
- Secondary Packaging: High-speed multi-lane collation conveyors directly link with automatic horizontal cartoners and flow-wrappers.
- End-of-Line Verification: Dynamic inline checkweighers, X-ray foreign body inspection, and robotic case packers.
4. Sanitary Cleaning (CIP/SIP) & Cleanroom Mandates
Evaluate hygienic design standards to ensure compliance with international food and pharmaceutical audits:
- Tool-Less Disassembly: Quick-release dosing hoppers, pump cylinders, and forming dies reduce changeover intervals to under 15 minutes.
- Sanitary SUS316L Contact Parts: Electropolished contact surfaces resist corrosion from high-acidity sauces, saline solutions, and sanitizers.
- IP65 Washdown Ingress Protection: Sealed electrical cabinets protect sensitive motion controllers during wet factory washdown routines.
Frequently Asked Questions (FAQ)
What is the key difference between a 3-side seal and a 4-side seal bag machine?
A 3-side seal machine folds a single web of film and seals three edges, resulting in one folded edge that can curve or warp. A four-side sealing bag machine seals all four perimeter edges, creating a symmetrical, perfectly flat sachet with higher mechanical burst strength, superior graphic display, and enhanced multi-layer barrier containment.
Can one 4-side seal machine handle both liquid and powder products?
Yes. Ludyway packaging machines are designed with modular dosing stations. You can interchange a servo powder auger filler with a liquid/paste piston pump assembly on the same chassis. Mechanical changeover and software recipe switching take approximately 20–30 minutes.
What types of packaging film materials can be used?
Our machines are compatible with almost all heat-sealable composite laminates, including PET/AL/PE, PET/PE, OPP/CPP, Paper/PE, Nylon/PE, as well as modern recyclable mono-PE, mono-PP, and PLA biodegradable films.
How does Ludyway support global installation, commissioning, and after-sales service?
We provide complete FAT (Factory Acceptance Testing), on-site installation by veteran packaging engineers, and operator training. Furthermore, all machines are equipped with secure IoT remote diagnostic modules for real-time technical support, troubleshooting, and lifetime spare parts supply.
Transform Your Packaging Facility with Ludyway Automation
Speak directly with our senior packaging machinery engineers to design a customized four-side sealing line tailored to your sachet geometry, materials, and target throughput.
