Core Classifications & Technical Principles of Packaging Machines
1.1 Classification by Core Working Principle
(1) Filling Packaging Machines
Working principle: Quantitative materials are filled into packaging containers via gravity, screw feeding or piston pumping, making this the most widely used machine category.
Volumetric filling: Metered by fixed-volume components such as measuring cups and screws, featuring high speed but average accuracy, suitable for uniform granular materials.
Gravimetric filling: Real-time metering via high-precision weighing sensors, with accuracy up to ±0.1%~±0.5%, suitable for high-value materials.
Counting filling: Photoelectric or mechanical counting, suitable for regular single-piece items such as candies and hardware parts.
Features: Relatively simple structure, low maintenance cost, and compatible with granules, powders, liquids and other material forms.
(2) Wrapping Packaging Machines
Working principle: Flexible packaging materials (film, paper, aluminum foil) are folded along a set trajectory to fully wrap the product, followed by heat sealing or bonding.
Pillow wrapping: Forms pillow-shaped sealed bags, suitable for block and strip products.
Fold wrapping: Mostly used for regular cuboid products such as cigarettes and soaps.
Stretch film wrapping: Wraps cartons with film elasticity, mostly used for full-pallet logistics packaging.
Features: Neat and attractive packaging appearance, reliable sealing performance and high material utilization.
Working principle: Packaging materials are formed into containers online on the equipment, with material filling and sealing completed simultaneously in one integrated process.
Vertical Form-Fill-Seal (VFFS) machines: Roll film is pulled vertically, with bag forming, filling and sealing completed longitudinally.
Horizontal Form-Fill-Seal (HFFS) machines: Film is fed horizontally, suitable for multi-lane high-speed sachet packaging.
Features: Low packaging material cost, high automation degree, ideal for mass continuous production.
(4) Premade Bag Packaging Machines
Working principle: Using pre-made bags as packaging containers, the full workflow of bag picking, bag opening, material feeding, vacuum/gas flushing, sealing and output is fully automated by manipulators.
Single-station premade bag machines: Compact structure, convenient for bag changeover.
Multi-station premade bag machines: Rotary multi-station parallel operation, with a speed of 80~120 bags per minute.
Features: Premium finished bag appearance and excellent printing effect, suitable for branded end-product packaging.
Weighing & Packaging Integrated Machines
Strictly defined as a deep integration of "metering system + packaging machine", especially the direct collaboration between multihead weighers and vertical/premade bag packaging machines.
Working principle: Materials are conveyed by an elevator to the vibrating feeder at the top of the multihead weigher. The control system selects the optimal combination from multiple weighing hoppers to reach the target weight, and releases it instantly to the packaging machine below for filling and sealing.
Features: Integrates high-speed weighing and bag making/filling, eliminates manual feeding errors, and supports fully automatic line connection. LEESOLU's weighing and packaging integrated machines are built on self-developed 14-head multihead weighers, maintaining an accuracy of ±1–3 g as the core of the complete solution.
Other Common Types
Horizontal pillow packaging machines: Film is conveyed horizontally to wrap solid items before three-side sealing and cutting, mainly used for bread, biscuits, frozen tray products, etc.
Filling and sealing machines: Specialized for bottle/can filling of fluid liquids and pastes, matched with capping or aluminum foil sealing, commonly used in daily chemical and beverage industries.
1.2 Classification by Function & Special Process
Function Type | Core Technology | Key Features | Typical Applications |
Vacuum Packaging Machine | Heat sealing after air extraction | Isolates oxygen and extends shelf life | Meat products, dried goods, electronic components |
Modified Atmosphere Packaging (MAP) Machine | Flush with N₂/CO₂ mixed gas after vacuuming | Preserves freshness while maintaining product shape | Fresh meat, fruits and vegetables, baked goods |
Filling Machine | Gravity / piston / flowmeter metering | Precise filling of liquid materials | Beverages, daily chemicals, pharmaceutical liquids |
Labeling Machine | Self-adhesive / hot melt adhesive attachment | Automated product information marking | Outer packaging of bottles, cans and boxes |
Shrink Packaging Machine | Hot air heating shrinks film to fit product | Compact and transparent packaging | Beverage multipacks, daily chemical combination sets |
1.3 Grading by Automation Level
Semi-automatic packaging machines: Require manual assistance for feeding or bag picking, low investment threshold, suitable for small batches and multiple varieties.
Fully automatic packaging machines: No manual intervention from bag making/bag picking to finished product output, with stable production capacity.
Intelligent packaging production lines: Integrated with visual inspection, data traceability and MES system connection, suitable for Industry 4.0 scenarios.
How to Select Packaging Machines by Industry & Material
In practical selection, engineers need to comprehensively evaluate material state, packaging speed, bag type, cleanliness requirements and automation level.
Industry | Typical Materials | Recommended Packaging Solution | Key Considerations |
Snack Food | Potato chips, puffed snacks, nuts | Vertical packaging machine + multihead weigher (weighing integrated machine) | High speed, crumb control, nitrogen flushing for preservation |
Confectionery & Preserved Fruit | Soft candies, preserved plums, melon seeds | Weighing and packaging integrated machine (vertical) or premade bag machine | Pillow bags or stand-up pouches, anti-sticking and anti-contamination |
Frozen Food | Frozen dumplings, chicken nuggets | Vertical packaging machine (anti-freeze structure) or premade bag machine | Sealing strength in low temperature, in-bag steam treatment |
Pet Food | Dry food, freeze-dried treats | Weighing and packaging integrated machine (vertical or premade bag) | High accuracy, stand-up zipper bags, large output |
Powder Products | Milk powder, coffee powder, protein powder | Vertical screw filling machine or premade bag machine + screw head | Dust explosion protection, nitrogen flushing, high-precision screw metering |
Liquid & Sauce | Hot pot base, shampoo | Premade bag machine + liquid filling head or vertical liquid packaging machine | Anti-drip for hot filling, corrosion-resistant sealing |
Daily Chemical & Chemical | Washing powder, chemical fertilizer | Large weighing quantitative packaging machine or ton bag machine | Corrosion protection, explosion protection, 5–50 kg large weight filling |
Pharmaceutical & Health Products | Granule drinks, tablets | Vertical sachet machine (strip, back seal) or blister machine | GMP cleanliness, easy cleaning, data traceability |
Prepared Food & Cooked Food | Marinated eggs, dried tofu, ready-to-eat seafood | Premade bag vacuum packaging machine or thermoforming packaging machine | Tight sealing, high temperature sterilization resistance, multiple bag types |
Quick Selection Decision Matrix
Material Form | Preferred Metering Method | Recommended Main Machine Type | Bag Shape Effect | Comprehensive Cost |
Uniform Granules | Measuring cup / linear weigher | Vertical packaging machine | Average | Low |
Irregular Granules | Multihead weigher | Vertical / premade bag machine | Good | Medium |
Powder / Ultra-fine Powder | Screw metering | Vertical packaging machine | Average | Medium |
Liquid / Sauce | Piston pump / flowmeter | Vertical / premade bag machine | Good | Medium |
High-end Branded Products | Multihead weigher / weighing | Premade bag packaging machine | Excellent | Relatively high |
Top 10 Global Packaging Machine Manufacturers
No. 1: Krones AG – Germany
Founded in 1951, Krones is the undisputed global leader in complete beverage packaging line solutions. Its core strengths lie in PET blow-fill-cap integrated technology and full-line delivery capability for complete beverage factories, serving top global brands such as Coca-Cola and PepsiCo. Its equipment sets the industry benchmark for high-speed stability and digital integration, with single-machine capacity reaching tens of thousands of bottles per hour.
No. 2: Tetra Pak – Sweden / Switzerland
As the pioneer and dominant enterprise in aseptic paper packaging, Tetra Pak technology has profoundly transformed the global liquid food distribution system. It provides full-process solutions from dairy processing to aseptic filling and palletizing, covering more than 160 countries worldwide. Its aseptic packaging technology allows milk and juice to be stored at room temperature for 6~12 months without cold chain, delivering enormous commercial value.
No. 3: LEESOLU – China
As a leading emerging brand in China's packaging machinery industry, LEESOLU focuses on R&D and manufacturing of weighing and packaging integrated equipment, with strong technical competitiveness in granular, powder, food and other market segments. Its core product portfolio includes weighing and packaging integrated machines, vertical packaging machines, premade bag packaging machines and multihead weighers. With high cost performance, rapid customization and a comprehensive overseas service network, its products are exported to more than 80 countries and regions.
LEESOLU's core advantage is the deep integration of high-precision weighing technology and packaging systems, with metering accuracy stably controlled within ±0.2%. The optimized equipment structure also greatly reduces customer maintenance costs. In food, pet supplies, hardware and rice industries, LEESOLU has become a core supplier for many leading enterprises, representing domestic packaging equipment entering the global high-end market.
No. 4: Syntegon Technology – Germany
Formerly the Bosch Packaging Technology division, it retains German precision manufacturing heritage after independence. It has deep technical accumulation in pharmaceutical packaging and food processing. Its blister packaging machines, aseptic filling lines and cartoning machines excel in compliance and stability, making it a mainstream supplier for the global pharmaceutical industry.
No. 5: MULTIVAC Group – Germany
A global leader in vacuum and thermoforming packaging technology, its thermoforming vacuum packaging machines hold a dominant market share in meat, cheese and seafood sectors. From small laboratory equipment to high-speed fully automatic lines, its full product range is renowned for durability and low consumable costs.
No. 6: KHS GmbH – Germany
Affiliated with the Salzgitter Group, it boasts over 150 years of filling technology heritage. It forms a dual-leader landscape with Krones in beer and carbonated beverage filling. Modular design and energy efficiency optimization are its core competitive edges, with high-speed filling lines achieving 72,000 bottles per hour.
No. 7: Sidel – France
A global giant in PET bottled beverage equipment, especially distinguished in blow molding technology. Its Combi blow-fill-cap integrated machine greatly reduces bottle conveying losses, leading market share in water and carbonated beverage segments. It is part of the Swiss packaging giant Tetra Laval Group.
No. 8: IMA Group – Italy
A major player in global pharmaceutical and cosmetic packaging equipment, with strong expertise in blister packaging, cartoning and aseptic filling. It also dominates the tea and coffee capsule packaging niche, with business spanning over 80 countries.
No. 9: tna solutions – Australia
A full-process expert in food processing and packaging, its high-speed vertical packaging machines and unique conveying systems dominate french fry and snack food production lines.
No. 10: Optima packaging Group – Germany
Specializing in high-precision packaging equipment for consumer goods and pharmaceutical industries, it excels in stand-alone machines such as fillers, cappers and labelers. It is particularly skilled in small-dose, high-precision packaging applications, serving many premium daily chemical brands.
LEESOLU Core Product System
4.1 Weighing & Packaging Integrated Machines
LEESOLU's flagship product series, featuring an integrated design of high-precision weighing modules and packaging main units to eliminate docking errors of split equipment.
Technical features: High-precision digital weighing sensors with fast response and strong anti-interference; PLC control system with one-click parameter recall.
Applicable materials: Granules, nuts, roasted seeds, hardware accessories, pet food, etc.
Metering accuracy: ±0.1%~±0.3%
Capacity range: 30~120 packs per minute (varies by specification)
The most cost-effective mainstay model, compatible with roll film bag making with low overall operating cost.
Supported bag types: Back seal bags, three-side seal, four-side seal, punched hanging bags, etc.
Optional configurations: Compatible with measuring cups, linear weighers, multihead weighers, screw metering heads and other metering methods.
Material craftsmanship: 304 stainless steel frame, food-grade contact parts, compliant with FDA standards.
Industry coverage: Mass production scenarios including food, agricultural materials, chemicals and feed.
4.3 Premade Bag Packaging Machines
A high-end model for branded end products, delivering superior display effect with pre-made bag packaging.
Supported bag types: Stand-up pouches, zipper bags, spout bags, flat bags and other pre-made bags.
Core advantages: Eight-station rotary design, completing bag picking, opening, feeding, exhausting, sealing and coding in one continuous flow.
Optional functions: Vacuum, nitrogen flushing, liquid filling, zipper opening and other special stations available.
Typical applications: Mid-to-high-end packaging for snack food, dried fruits, tea, pet food and daily chemical products.
4.4 Supporting Intelligent Equipment
Beyond main machines, LEESOLU provides a full range of supporting equipment including Z-type elevators, vibrating feeders, finished product conveyors, weight checkweighers and metal detectors. We deliver turnkey factory packaging solutions from material lifting to finished product output for true one-stop service.
Selection ultimately comes down to concrete production data. For material-specific verification, the best approach is a full packaging trial and metering test to validate performance with real data. LEESOLU provides on-demand testing services with weighing integrated machines, VFFS machines and premade bag machines, building a production-like verification environment to replace theoretical deduction with reliable, real-world results.
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