LANTU PACKAGING MACHINERY
Seal Type Options: Back Sealing, Threeside Seal, Four-side Seal
Start with your pouch style requirements, seal strength, and production goals. Discuss a sealing configuration for your packaging appearance and workflow with Lantu.
- Define product characteristics, packaging materials, and target pouch structures (pillow seal, 3-side seal, or 4-side seal).
- Match corresponding heat-sealing jaw components and cutter structures to your film sealability.
- Review tear notch punching, gas flushing/exhaust, and downstream pouch conveyor integration requirements.
Tell us what you pack. We’ll help you discuss a suitable equipment configuration.
EQUIPMENT OVERVIEW
Product details & configuration
Say Goodbye to Leakage and Wrinkles: Streamline Your Vertical Packaging for Multiple Seal Types
The Automatic Multi-Functional Vertical Packaging Machine (Vertical Packaging Machine Series for Back-Sealing, Three-Side-Sealing, and Four-Side-Sealing Bags) is an industrial-grade, high-efficiency automated solution designed to eliminate factory packaging pain points—such as limited bag styles, prone-to-leak unconventional seals, poor film adaptability, and unstable traditional sealing.
LANTU Machinery introduces core models including Back-Seal (Pillow/Gusset) Vertical Packaging Machines, Three-Side-Seal Vertical Packaging Machines, and High-Flatness Four-Side-Seal Vertical Packaging Machine Units. Equipped with modular adjustable sealing structures, precision former assemblies, and smart independent temperature control units—paired with high-precision servo film pulling and pneumatic/servo sealing systems—these machines operate like expert vertical packaging specialists for versatile bag styles. Whether handling powders, granules, liquids, or solids, the machine flexibly completes the entire integrated process for classic sealing types—back-seal, three-side-seal, and four-side-seal—delivering flat, tightly sealed, and aesthetically pleasing packages tailored to product positioning and display requirements.
As a direct equipment manufacturer, LANTU Machinery makes the complex fully automated vertical packaging process—encompassing multi-seal mechanism switching, film slitting and forming, film pulling positioning, and vertical/horizontal sealing and coding—as easy to operate as a smartphone. Operators simply set the target bag length and temperature parameters on the PLC touchscreen, and the machine automatically handles film pulling, forming, filling, sealing, and cutting, smoothly delivering finished bags. Offering comprehensive structural solutions across back-seal, three-side-seal, and four-side-seal styles, this series significantly enhances factory packaging flexibility while saving labor, time, and costs.
Choosing a reputable direct manufacturer is crucial to maximizing your return on equipment investment. LANTU Machinery’s proven multi-seal forming technology, combined with high reliability and industry-leading packaging material efficiency, ensures your multi-bag-style vertical packaging line operates smoothly with zero breakdowns.
Core Components & Three Major Protective Systems (LANTU Precision Parts)
Our multi-seal vertical packaging machine series is equipped with industry-leading core components to guarantee high quality, zero defects, and an ultra-long service life right from the source.
1. Feeding & Forming Conveyor System
Modular Replaceable Formers: Equipped with precision-polished formers tailored to the folding requirements of back-seal, three-side-seal, and four-side-seal configurations, ensuring smooth, scratch-free film movement and quick switchovers.
Automatic Tension-Adjusting Film Pulling Mechanism: Maintains consistent, smooth tension on the film roll during forming and sealing to prevent drifting and wrinkling.
High-Precision Material Docking Channel: Seamlessly interfaces with volumetric cups, auger fillers, multi-head weighers, or liquid pumps to ensure accurate filling without contamination of the sealing area.
2. Multi-Seal Forming & Sealing System
Back-Seal (Pillow/Gusset) Sealing Unit: Utilizes back vertical seam heat-sealing paired with top and bottom horizontal cutting—ideal for classic pillow bags and gusseted stand-up bags, saving film while maximizing material utilization.
Three-Side-Seal Mechanism: Features single-side vertical sealing paired with top and bottom horizontal sealing, delivering uniform stress distribution and structured packaging—ideal for small-volume precision packaging in pharmaceuticals and daily chemicals.
Four-Side-Seal High-Flatness Mechanism: Equipped with dual-side symmetric vertical sealing and top/bottom horizontal sealing units; the four embossed edges seal tightly to produce exceptionally flat, high-end bag shapes that significantly boost product value.
PID Smart Independent Temperature Control & Anti-Clamping Sensor: Every sealing edge features an independent PID temperature control module paired with a rebound sensor to completely eliminate material clamping, leaks, and cutting damage.
3. Intelligent Control & Safety Protection System
SIEMENS/Mitsubishi PLC Central Control Core: Driven by an industrial-grade multi-core CPU for stable operation and strong anti-interference performance, supporting switching between 10 languages.
Photoelectric/Signal Synchronized Control: Features millisecond-level seamless coordination between color mark tracking and sealing/cutting; stops pulling film when no material is present and ensures precise cut positioning.
Fully Enclosed Safety Door: The heavy-duty 304 stainless steel body includes transparent safety door protection that stops operation upon opening—meeting GMP, food, and pharmaceutical hygiene standards while ensuring operator safety.
Technical Specifications
To meet the diverse demands of different factories regarding packaging materials, bag styles, and sealing patterns, Lanto Machinery offers four core model series of Automatic Multi-functional Vertical Packaging Machines (Back-Seal, 3-Side Seal, and 4-Side Seal Series):
| Technical Parameter | LT-320B / 420B (Back Seal / Gusset) | LT-520B / 620B (Heavy Back Seal / Large Capacity) | LT-320T / 420T (3-Side Seal) | LT-320F4 / 420F4 (High-End 4-Side Seal) |
| Sealing Type | Back-seal pillow bag / Side gusset standing bag | Large volume back-seal bag / Heavy gusset bag | Standard 3-side seal flat bag / Easy-tear bag | Symmetric 4-side seal premium bag / Chain bag |
| Max. Film Width | Max. 320 mm / 420 mm | Max. 520 mm / 620 mm | Max. 320 mm / 420 mm | Max. 320 mm / 420 mm |
| Bag Size Range (L×W) | L: 60–300mm / W: 50–200mm | L: 100–450mm / W: 150–300mm | L: 50–200mm / W: 40–150mm | L: 60–250mm / W: 50–180mm |
| Weighing / Capacity Range | 10g – 1000g | 500g – 5000g | 5g – 500g | 10g – 800g |
| Max. Packaging Speed | 30 – 80 bags/min | 15 – 50 bags/min | 30 – 75 bags/min | 25 – 65 bags/min |
| Temperature Control | Independent PID ($\pm 1^\circ\text{C}$) | Independent PID ($\pm 1^\circ\text{C}$) | Multi-channel PID ($\pm 1^\circ\text{C}$) | 4-Side Multi-channel PID ($\pm 1^\circ\text{C}$) |
| Drive & Sealing Method | Single/Dual Servo Film Pulling + Pneumatic/Servo Seal | Dual/Triple Servo Drive + Heavy-Duty Seal | Servo Film Pulling + Auto Tension Control | 4-Axis Synchronous Servo + Floating Tension |
| Applicable Film Material | Laminated films (OPP/CPP, PET/PE, Aluminum Foil); Optional PE pulse system | Laminated films (OPP/CPP, PET/PE, Aluminum Foil); Optional PE pulse system | Laminated films (OPP/CPP, PET/PE, Aluminum Foil); Optional PE pulse system | Laminated films (OPP/CPP, PET/PE, Paper-Alu, etc.) |
| Control System | Siemens/Mitsubishi PLC + 7-inch Touchscreen (No-material film stop) | Siemens/Mitsubishi PLC + 10-inch Touchscreen (No-material film stop) | Siemens/Mitsubishi PLC + 7-inch Touchscreen (Photocell alignment) | Siemens/Mitsubishi PLC + 7/10-inch Touchscreen (4-side mold alignment) |
| Air Supply & Consumption | 0.6–0.8 MPa (0.3 m³/min) | 0.6–0.8 MPa (0.45 m³/min) | 0.6–0.8 MPa (0.25 m³/min) | 0.6–0.8 MPa (0.35 m³/min) |
| Power Supply & Rating | AC 220V/50Hz / 2.2 kW | AC 220V/380V/50Hz / 4.5 kW | AC 220V/50Hz / 2.0 kW | AC 220V/50Hz / 3.2 kW |
| Machine Construction | Contact parts or full machine: 304 Stainless Steel | Full machine: Heavy-Duty 304 Stainless Steel | Contact parts or full machine: 304 Stainless Steel | Full machine: 304 Stainless Steel / Dust Safety Guard |
| Compatible Dosing Units | Multihead Weigher / Volumetric Cup / Auger Filler / Liquid Pump / Bucket | Multihead Weigher / Volumetric Cup / Auger Filler / Liquid Pump / Bucket | Volumetric Cup / Auger Filler / Peristaltic Pump / Counting Bowl | Auger Filler / Multihead Weigher / Liquid Pump / Counting Bowl |
Sealing Type Options & Application Guide
To maximize line efficiency, LANTU Machinery multi-seal vertical packaging machines offer three core sealing configurations with high compatibility and customizable designs:
1. Sealing Type Options (Customized by Bag Requirements)
Back-Seal (Pillow / Gusset Seal): Features a single rear vertical seam with top and bottom horizontal seals. Economical, film-efficient, and offering large fill volume, it is the most versatile option for snacks, granules, and powders; adding a gusseting device enables a free-standing effect.
Three-Side-Seal: Seals along the bottom and both sides (or top and both sides). Features flat sealing edges, uniform stress distribution, and excellent leak resistance—widely used for small sample pouches, pharmaceutical sachets, facial mask packets, and condiment bags.
Four-Side-Seal: Seals all four edges around front and back film sheets or folded single films. Offers a strong three-dimensional presence, elegant symmetric appearance, superior airtightness, and high pressure/moisture resistance—the premier choice for premium health supplements, pharmaceuticals, cosmetics, and specialty tea bags.
2. Applicable Bag Styles (Automatic Roll-Film Forming)
Standard Back-Seal Pillow Bags / Gusseted Bags
Standard Three-Side-Seal Flat Pouches / Easy-Tear Pouches
Symmetric Four-Side-Seal Premium Pouches / Chain Four-Side-Seal Bags
5 Reasons to Choose LANTU Machinery Multi-Seal Vertical Packaging Machines
When investing in automated packaging equipment, high accuracy, low maintenance, and long-term stability are key metrics. LANTU Machinery ensures every machine delivered is built for plug-and-play operation and long-lasting durability.
Multi-Functional Versatility & Zero-Leak Guarantee: Precision sealing patterns paired with accurate temperature control deliver zero-leak sealing across economical back-seals and high-end four-side-seals alike.
Ultra-Clean Anti-Vibration Air and Electric Circuits: All electrical control wiring and pneumatic pipelines undergo strict modular anti-vibration and dust-proof sealing treatments to minimize operational fault rates.
Full-Process Dry Run & Material Testing Before Delivery: Before leaving the factory, machines undergo extended continuous running tests at high, medium, and low speeds with various film sealing materials to eliminate sealing and cutting errors.
Dual Protection for Voltage & Pressure Stability: Built-in wide-range voltage stabilization and air pressure overload protection handle factory power fluctuations and unstable air supply, maintaining consistent film pulling and sealing quality.
Tool-Free Modular Quick-Release Design: Sealing jaws and formers feature tool-free quick-release mechanisms, allowing rapid sealing type changes and cleaning maintenance to minimize downtime.
Key Factors to Consider When Buying a Multi-Seal Vertical Packaging Machine
To help select the optimal machine for your production line, consider these key purchasing criteria:
Terminal Product Positioning & Sealing Appearance Requirements:
For maximum cost-efficiency and large volume: Choose a Back-Seal Model.
For compact flatness and high cost-effectiveness: Choose a Three-Side-Seal Model.
For premium display presence and high moisture-proof sealing: Choose a Four-Side-Seal Model.
Target Bag Dimensions & Maximum Roll Width: Select the matching machine size and former specifications based on required bag length and width.
Packaging Film Material & Thickness: Composite films (OPP/CPP, PET/PE) use standard heated sealing jaws; single-layer PE or special paper-aluminum composite films require dedicated heated or impulse PE sealing systems.
Target Output Capacity (bags/min): Choose single-lane or multi-lane sealing structures based on your required speed (e.g., 30–80 bags/min).
Special Feature Requirements: Determine whether options like easy-tear notch punching, chain bag cutting, nitrogen flushing, or date/batch coding (thermal/laser) are needed.
Frequently Asked Questions (FAQ)
Q1: Can back-seal, three-side-seal, and four-side-seal styles be freely switched on the same machine?
Answer: Mechanical film pulling and sealing jaw structures differ between back-seal and three/four-side seal configurations. Back-seal units usually use a standalone structure, whereas three-side and four-side seals can be switched on certain versatile models by changing formers and adjusting sealing jaw positions. LANTU Machinery provides modular custom models if multi-style switching is required.
Q2: How do you solve stretch deformation or wrinkling during four-side sealing?
Answer: We utilize a four-axis synchronized servo film pulling system paired with floating tension control to ensure uniform force on the film during feeding and sealing. Mold-grade precision sealing jaws completely eliminate edge wrinkling.
Q3: How complex is it to adjust settings when changing bag sizes or sealing specs?
Answer: It is very straightforward. Formers and sealing jaws feature quick-release structures, allowing operators to adjust bag length and sealing temperatures on the PLC touchscreen in under 15 minutes.
Contact the Manufacturer Today to Receive Your Customized Multi-Seal Vertical Packaging Solution! LANTU Machinery — Dedicated to Packaging Equipment Manufacturing, Direct Source Quality Guaranteed.
Let’s discuss your packaging requirements.
Share your product, packaging format and production goals. Contact Lantu to discuss a suitable equipment configuration.