Collar Type Packing Machine

Collar Type Auger Powder Packing Machine

SW-420E / SW-520E / SW-620E / SW-720E / SW-820E

Vertical form-fill-seal machine with an integrated auger screw filler for fine and ultra-fine powders — milk powder, spice, flour, and chemical powder. Forms back-seal pillow bags from roll film at up to 70 bags per minute with fill accuracy of ±1 g (≤100 g) · ±1% (>100 g).

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ShengWei SW-420E collar type auger powder packing machine — vertical form-fill-seal with screw filler for milk powder, spice, and flour packaging

Quality

CE Certified

Source

Factory Direct · Guangdong

Customization

OEM · Voltage · Language

After-Sales

2-Year Warranty · Lifetime Remote Support

Product Overview

SW-420E / SW-520E / SW-620E / SW-720E / SW-820E: Auger-Filled VFFS for Powders

The SW-420E, SW-520E, SW-620E, SW-720E, and SW-820E are collar type vertical form-fill-seal (VFFS) machines equipped with an integrated auger screw filler for precise dosing of free-flowing and non-free-flowing powders. The machine forms each bag in-line from a roll of packaging film — wrapping it around a triangular forming collar into a tube, sealing the back seam vertically, then filling through the auger screw nozzle and sealing each bag at the bottom.

The auger filler delivers ±1 g accuracy for weights up to 100 g and ±1% for weights above 100 g — critical for milk powder, spice blends, and chemical fine powders where consistent dosing directly affects product cost and regulatory compliance. A Siemens PLC and touch screen control all parameters — fill weight, bag length, auger speed, sealing temperature — from a single interface. The SW-620E handles larger bag widths (up to 300 mm) and higher fill weights (up to 1,500 g), while the SW-720E and SW-820E extend bag widths to 350 mm and 400 mm for industrial-scale powder packaging.

Packing Speed

Up to 70 bags / min depending on model, product and fill weight

Fill Range

Up to 5,000 g (SW-820E)

Total Power

5–6 kW

Parameter	SW-420E	SW-520E	SW-620E	SW-720E	SW-820E
Roll Film Width	≤420 mm	≤520 mm	≤620 mm	≤720 mm	≤820 mm
Bag Length	80–300 mm	80–350 mm	80–320 mm	80–500 mm	80–600 mm
Bag Width	80–200 mm	130–250 mm	150–300 mm	170–350 mm	220–400 mm
Fill Weight Range	50–1,000 g	300–2,000 g	500–1,500 g	1,000–3,000 g	2,500–5,000 g
Packing Speed	15–70 bags/min	15–60 bags/min	15–50 bags/min	15–45 bags/min	10–40 bags/min
Fill Accuracy	±1 g (≤100 g) · ±1% (>100 g)
Bag Format	Back-Seal Pillow Bag (from roll film)
Filling System	Auger screw filler (servo-driven, adjustable speed)
Feeding System	Auger screw conveyor with stainless steel hopper
Sealing Type	Back side sealing (vertical) + horizontal cross-seal
Control System	Siemens PLC + Siemens HMI touch screen
Servo Motor	2 servo motors — film pull (Yichuan) + auger drive
Contact Material	SUS304 Stainless Steel
Total Power	5 kW (SW-820E: 6 kW) · 220V · 50/60 Hz
Air Consumption	0.6–1.2 m³/min
Machine Weight	~700 kg	~700 kg	~900 kg	~900 kg	~1,000 kg
Dimensions (L×W×H)	3,500 × 1,400 × 2,700 mm	3,500 × 1,400 × 2,700 mm	3,800 × 1,600 × 2,950 mm	3,800 × 1,600 × 2,950 mm	3,800 × 1,600 × 2,950 mm

SW-420E/520E/620E/720E/820E collar type auger powder packing machine component overview — Siemens PLC, auger screw filler, bag former, double belt, sealing mold

SW-420E/520E/620E/720E/820E key components: Siemens PLC control system, auger screw filler, triangular forming collar, double-belt film pull, and heat-sealing jaws.

Choose by Bag Weight

Start from the weight you put in each bag. The fill ranges overlap, so where two models cover your weight, the bag width you need and the density of your powder decide. Fill accuracy is ±1 g up to 100 g and ±1% above 100 g on every model.

Fill weight, bag width, film width and speed for each model, from the specification table above. Actual speed depends on your powder and fill weight.

Fill weight per bag	Model	Bag width	Roll film width	Rated speed
50–1,000 g	SW-420E	80–200 mm	≤420 mm	15–70 bags/min
300–2,000 g	SW-520E	130–250 mm	≤520 mm	15–60 bags/min
500–1,500 g	SW-620E	150–300 mm	≤620 mm	15–50 bags/min
1,000–3,000 g	SW-720E	170–350 mm	≤720 mm	15–45 bags/min
2,500–5,000 g	SW-820E	220–400 mm	≤820 mm	10–40 bags/min

Below 50 g per bag, the fill range of this series does not apply; see the small sachet machines in our vertical packing machine range. Above 5,000 g per bag is outside the rated range of the SW-820E; send your bag weight and powder details and we will tell you what we can offer.

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Application Scenarios

Recommended Configurations by Product

The SW-420E/520E/620E/720E/820E handles a broad range of powder products. Speed and accuracy depend on powder density, fill weight, and particle fineness — contact us with your product specification for a tailored estimate. For how density, fill weight and fineness shape the rest of the line, see powder packaging line planning.

Milk Powder & Protein Powder

100–1,000 g pouch for retail and food service

Model: SW-420E (≤1 kg) / SW-620E (≥500 g, wider bag)
Filling: Auger screw filler, servo-controlled speed
Accuracy: ±1 g (≤100 g) · ±1% (>100 g)
Clients: Dairy brands, nutrition supplement manufacturers, co-packers

Spice & Seasoning Powder

50–200 g sachet for retail and catering

Model: SW-420E
Filling: Auger screw filler with anti-dust seal
Accuracy: ±1 g (≤100 g) · ±1% (>100 g)
Clients: Spice brands, seasoning factories, private-label packers

Chemical Powder

50–500 g pouch for chemical industries

Model: SW-420E
Filling: Auger screw filler, SUS304 stainless steel
Accuracy: ±1 g (≤100 g) · ±1% (>100 g)
Add-ons: Dust collection hood, nitrogen flushing

Flour & Starch

500–1,500 g bag for wholesale and food processing

Model: SW-620E
Filling: Auger screw filler, high-torque motor
Accuracy: ±1 g (≤100 g) · ±1% (>100 g)
Clients: Flour mills, food ingredient suppliers, baking supply distributors

The SW-420E/520E/620E/720E/820E is optimized for powder products. For granules (sugar, rice, seeds), see the SW-420A/620A/820A multi-heads granule weigher machine. For liquids (sauce, milk, vinegar), see the SW-420F collar type liquid packing machine.

Bag Format

Output Bag Type: Back-Seal Pillow Bag

The SW-420E/520E/620E/720E/820E forms bags in-line from roll film using a triangular forming collar. The output format is a back-seal pillow bag — a back seam runs along one side, horizontal cross-seals close the top and bottom. This is the most cost-effective format for powder portioning: low material cost, excellent seal integrity against moisture ingress, and compatibility with aluminum foil laminates for light and oxygen barrier protection.

Chilli Powder — 70 g sachet, retail display

Milk Powder — 400 g gusset pouch (optional device)

500 g matcha milk tea powder in back-seal sachet — packed by SW-420E collar type VFFS auger machine

Tea Powder — 500 g back-seal sachet

Back seal pouch structural diagram — standard output of collar type VFFS machine

Back Seal (Fin Seal)

Gusset pouch structural diagram — optional with gusseted bag device on SW-420E/520E/620E/720E/820E

Gusset Pouch (Optional Add-On)

Compatible film materials: PE, CPP, PET/PE laminate, aluminum foil composite (recommended for moisture-sensitive powders), nylon laminate, BOPP. Aluminum foil laminates provide the best moisture and oxygen barrier for hygroscopic powders such as milk powder and pharmaceutical formulations.

Note: The SW-420E/520E/620E/720E/820E does not support stand-up pouches, zipper bags, or flat-bottom bags. If these formats are required, see the SW-L premade bag powder machine.

Machine Operation

How the SW-420E Forms, Fills, and Seals

The SW-420E/520E/620E/720E/820E runs as a continuous-motion machine — each step flows into the next without stopping, producing a finished, sealed pouch in one integrated cycle.

Roll Film Loading

A roll of packaging film (PE, aluminum foil laminate, or CPP) mounts on the film frame at the back of the machine. Film threads through dancer rollers that maintain constant tension as a servo motor pulls the film through the forming station. An automatic film-end stop halts the machine when the roll is depleted, preventing unsealed bags.

Bag forming collar step — triangular collar folds film into tube for VFFS collar type machine

Bag Forming & Vertical Sealing

The flat film wraps around a precision-machined triangular forming collar, which folds it into a continuous tube. Heated vertical sealing rollers press and seal the overlapping edges to create the back seam. Changing bag width requires swapping the forming collar. An Omron rotary encoder tracks film position for consistent bag length control.

Auger Screw Filling

A servo-driven auger screw filler dispenses powder from the stainless steel hopper through the forming tube and into the open bag. The auger rotation count is precisely controlled by the Siemens PLC — each rotation delivers a fixed volume of powder. Fill weight is set digitally on the touch screen and adjustable in real time without stopping production. The screw conveyor feeds powder automatically from a bulk hopper into the filling hopper, maintaining a consistent level throughout production.

Sealing and cutting step — horizontal sealing jaws create top and bottom seals, knife cuts finished bag

Horizontal Sealing, Coding & Cutting

After each fill, horizontal sealing jaws clamp across the tube to create the top seal of the filled bag and the bottom seal of the next bag simultaneously. Jaw temperature, dwell time, and pressure are independently adjustable per film type via the HMI. An optional date printer codes batch number and expiry date onto each pouch. A cutting knife then severs the finished pouch, which drops onto the output conveyor.

See It in Action

Gallery & Video

SW-420E collar type auger powder packing machine — full factory floor view with auger screw conveyor

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SW-420E on factory floor — complete system with auger screw conveyor and powder hopper

SW-420E machine door open showing interior

Production Line

Complete Powder Packaging Line

The SW-420E/520E/620E/720E/820E operates as a standalone unit or as the core of a complete powder packaging line. ShengWei supplies the main machine plus all peripheral equipment — auger screw conveyor, powder hopper, date printer, and output conveyor — and provides a custom line layout drawing with every quotation.

SW-420E collar type auger powder packing machine — main vertical form-fill-seal unit

SW-420E / 620E Main Machine

Core vertical form-fill-seal unit with integrated auger filler. Forms bags from roll film, fills via servo-driven auger screw, seals and cuts in one continuous cycle.

Vertical Auger Screw Filler

Servo-driven auger screw mechanism for precise powder dosing. SUS304 stainless steel construction. The screw pitch and diameter match the powder particle size and target fill weight.

Auger Feeding Conveyor

Inclined screw conveyor automatically transports powder from ground-level hopper to the filler hopper at machine top. Maintains a constant powder level for uninterrupted production.

SW-420E vertical sealing pull belt and film roll spindle for continuous bag forming

Film Roll & Date Printer

Film roll spindle at machine base accommodates standard rollstock. An optional date printer codes batch number, production date, and expiry on every bag automatically.

Optional Add-Ons

All options are factory-installed and integrated with the Siemens PLC control system. Request a configuration when you inquire.

Dust collection hood — extracts airborne powder during filling to maintain a clean production environment
Nitrogen flushing device — injects nitrogen before horizontal sealing for extended shelf life of oxygen-sensitive powders
Gusseted bag device — adds side gussets to increase pouch volume without changing bag width
Checkweigher — downstream weight verification with automatic reject gate
Extended film roll capacity — larger film spindle for longer uninterrupted runs
Automatic correction motor — electrically compensates vertical seal offset via HMI without stopping the machine
Metal detector — downstream inline detection

Ask About Line Configuration

Quality Components

Branded Components You Can Verify

Every critical electrical and pneumatic component on the SW-420E/520E/620E/720E/820E is sourced from established industrial brands. Part numbers are listed on the quotation sheet — you can verify pricing and availability before you commit to an order.

Siemens SMART 700 HMI

7-inch colour touch screen. Controls fill weight, auger speed, bag length, sealing temperature, and production count. Multi-language support on request.

Siemens PLC

Programmable logic controller coordinating auger screw rotation, film pull, sealing jaws, and cutter in real-time. Fault diagnostics display on HMI panel.

AirTAC 4V210 solenoid valve controlling pneumatic sealing and cutting cylinders on SW-420E

AirTAC Solenoid Valve

Controls the pneumatic sealing jaw and cutting cylinder actuation. High-cycle rated for continuous multi-shift powder packaging production.

Omron Rotary Encoder

Precision film position feedback for accurate bag length control. Ensures consistent cut position even as film tension varies during production runs.

SMC guided pneumatic cylinder for horizontal sealing jaw on SW-420E collar type packing machine

SMC Guide Cylinder

Anti-rotation guided cylinder for sealing jaw actuation. Consistent jaw alignment maintains seal quality across the full bag count.

Schneider Easy9 circuit breaker in SW-420E collar type auger powder packing machine electrical cabinet

Schneider Circuit Breaker

CE-compliant thermal-magnetic protection for main electrical cabinet. Overcurrent and short-circuit protection for motor and control circuits.

Decision Guide

Collar Type Auger VFFS vs Premade Bag: Which Is Right for Your Powder?

Both the SW-420E/520E/620E/720E/820E (collar type) and the SW-L series (premade bag) package powders automatically. The right choice depends on your bag format requirements, production volume, and per-bag material cost sensitivity.

Choose SW-420E/520E/620E/720E/820E When:

Your product is a fine powder — flour, spice, instant coffee, milk powder or chemical powder
You need auger screw dosing — the only metering system that handles poor-flow, cohesive, or sticky powders accurately
Dust control is required — the enclosed auger filler + sealed hopper keep fines contained, unlike open cup or weigher systems
Your fill weight tolerance of ±1 g (≤100 g) · ±1% (>100 g) is acceptable for the application — the auger is optimized for this range
If your product is a free-flowing granule (sugar, seeds, nuts), use the SW-420A weigher, SW-320C linear weigher, or SW-320D cup; if a liquid, use the SW-420F

Choose Collar Type SW-420E/520E/620E/720E/820E When:

You need simple back-seal pillow bags at high daily volume — rollstock film costs meaningfully less than premade pouches
Your product is a consistent, free-flowing or semi-free-flowing powder (milk powder, spice, flour, chemical powder)
Fill weight accuracy of ±1 g (≤100 g) · ±1% (>100 g) is sufficient for your application — the auger screw filler is optimized for this range
Compact total line footprint is important — the SW-420E is 3,500 × 1,400 mm including the auger conveyor
You run high-volume, single-SKU production with infrequent changeovers

Choose Premade Bag SW-L Series When:

You need stand-up pouches, zipper bags, or flat-bottom bags — formats that collar type cannot produce
High-quality pre-printed graphics are important for retail shelf presentation
You run multiple SKUs and switch bag sizes or formats frequently within a shift
Your powder requires a premium, resealable package for consumer retail (e.g. coffee, protein powder)

When Neither Is the Right Fit

For granular products (sugar, rice, seeds, nuts) that require weighing rather than auger dosing, see the SW-420A/620A/820A collar type granule weigher machine. For liquid products, see the SW-420F collar type liquid packing machine.

About the Manufacturer

Why Choose ShengWei Machine

Factory Direct from Guangdong

Designed and manufactured in our own 11,000 m² factory in Shantou, Guangdong. No trading companies or middlemen — you communicate directly with the production engineers who build and test your machine before shipment.

Built-to-Order Configuration

Voltage (220V 50/60 Hz or custom), HMI language (English, Spanish, Arabic, Russian, Portuguese, and more), auger screw specification, hopper capacity, and accessories are all configurable per order. OEM branding is available for distributors.

Lifetime Remote Support

Free remote video technical support for the life of the machine — not only during the warranty period. Common spare parts typically ship from our Guangdong factory within 3 working days. On-site installation is available on request.

80+ Export Countries

ShengWei machines are exported to 80+ countries, including markets in Europe, Southeast Asia, Africa and the Middle East.

Factory Acceptance Test

Tested Before Shipment — How We Prove the SW-420E Series

Two-Day Run Test on Your Recipe

Every SW-420E and SW-620E goes through a structured Factory Acceptance Test before it ships: a test run across two working days, with speed, seal quality, fill weight, and rejection rate all logged. For an auger powder machine that means verifying auger dosing accuracy on your actual powder, checking screw pitch performance and hopper flow stability across your bag sizes (80–200 mm bag widths on the SW-420E, 150–300 mm on the SW-620E), and holding output stable across the 15–70 bags/min (SW-420E) and 15–50 (SW-620E) range. Free sample test run on your own product and film — we send you the test video, usually within 2 working days of receiving your samples.

Approve Before We Crate

Before crating, our QC team sends you the FAT report, a test video of your machine running, and photos for approval. If your order requires it, we coordinate SGS, Bureau Veritas, or TÜV pre-shipment inspection and provide full access to the machine and test records. See how the 4-person QC team works at our Factory & Quality Center.

FAQ

Frequently Asked Questions

What types of powder can the SW-420E/520E/620E/720E/820E handle?

The SW-420E/520E/620E/720E/820E handles both free-flowing and non-free-flowing powders. Typical products include milk powder, protein powder, flour, starch, spice blends (chilli, turmeric, cumin), coffee powder, cocoa powder, and chemical fine powders (detergent, fertilizer). For very coarse powders or granules (particle size above ~5 mm), a multi-head weigher machine is more appropriate — contact us to discuss your specific product.

How accurate is the auger screw filling system?

The auger screw filler delivers ±1 g accuracy for fill weights up to 100 g and ±1% for weights above 100 g. Accuracy depends on powder density, flowability, and the auger screw specification — we match the screw pitch and diameter to your specific product during the quotation phase. For applications requiring tighter accuracy (for example, premium consumer products), we can integrate a checkweigher for 100% weight verification with automatic rejection.

What is the difference between the SW-420E and SW-620E?

The SW-420E accepts film widths up to 420 mm (bag width 80–200 mm, fill weight 50–1,000 g) and runs at up to 70 bags/min. The SW-620E accepts film widths up to 620 mm (bag width 150–300 mm, fill weight 500–1,500 g) and runs at up to 50 bags/min. The 620E is designed for larger, heavier bags — typical for flour, industrial chemical powder, and bulk milk powder. Both models share the same Siemens PLC control system, auger filler mechanism, and frame construction.

How does collar type VFFS differ from a premade bag machine for powder?

A collar type VFFS machine forms each bag in-line from a roll of packaging film. The film wraps around a triangular forming collar into a tube, which is then sealed, filled, and cut in a single continuous motion. A premade bag machine loads pre-manufactured pouches from a magazine. The collar type uses lower-cost rollstock film and produces back-seal pillow bags. The premade bag machine supports premium formats (stand-up, zipper, flat-bottom) at a higher per-bag material cost. For high-volume, cost-sensitive powder sachet production, the collar type auger machine is typically the better choice.

Can I adjust fill weight and bag length without stopping the machine?

Yes. Fill weight is adjusted by changing the auger rotation count on the Siemens HMI touch screen — the new setting takes effect on the next bag cycle without stopping production. Bag length is also adjusted through the HMI via the servo film pull motor. Changing the bag width, however, requires replacing the forming collar at a planned stop.

What film materials are compatible with the SW-420E/520E/620E/720E/820E?

The SW-420E/520E/620E/720E/820E is compatible with standard flexible packaging rollstock: PE, CPP, PET/PE laminate, aluminum foil composite (highly recommended for moisture-sensitive powders like milk powder and pharmaceutical formulations), nylon/PE laminate, and BOPP. Sealing temperature and jaw pressure are independently adjustable for each material type via the HMI. Send us a sample of your intended film for a pre-production sealing test confirmation.

How does the machine handle dusty or hygroscopic powders?

For dusty powders such as spice, an optional dust collection hood mounts above the filling station to extract airborne particles and maintain a clean production area. For hygroscopic powders (milk powder, certain chemical powders) that absorb moisture, we recommend aluminum foil laminate film for the best moisture barrier. The auger filler and hopper are fully SUS304 stainless steel with smooth interior surfaces to prevent powder adhesion and simplify cleaning between product changeovers.

What is the lead time and payment terms?

Standard lead time is 15–30 working days after deposit confirmation. Payment terms: 30% deposit on order, 70% balance before shipment (T/T). Custom configurations (non-standard voltage, special auger screw specification, additional accessories) may add 5–10 working days. Contact us with your full specification for a confirmed production schedule.

Can I send a powder sample for a packing test before ordering?

Yes. Ship a sample of your powder product (approximately 5–10 kg) along with your target bag size and fill weight to our Shantou factory. We will run a filling and sealing test on the actual SW-420E, record a video of the results, and share the footage with recommended machine settings — including auger speed, sealing temperature, and bag dimensions. This is the most reliable method to confirm machine suitability before committing to an order. Contact us for the shipping address.

What warranty and after-sales support is included?

2-year warranty covering manufacturing defects under normal operating conditions. Wear parts (sealing strips, heating elements, auger screw) are excluded. Common spare parts typically ship from our Guangdong factory within 3 working days. Remote video technical support is included for the lifetime of the machine. On-site installation and operator training are available on request, with travel costs quoted separately.

Resources

Expert Guides

Seal Strength vs Seal Integrity

Why a strong-looking seal can still leak, which seal-integrity test finds what, and how the four sealing methods compare.

Read the Sealing Guide →

Multi-Head Weigher vs Auger vs Cup

The accuracy mechanism, give-away cost, cleaning, and failure modes of the three dosing methods compared.

Compare Dosing Methods →

How to Choose the Right Packaging Machine

A step-by-step buyer's path — product type, bag format, dosing, speed, and budget walked through in order.

Read the Choosing Guide →

Hungary Case Study: SW-420 and SW-1528 for Milk Powder and Tomato Powder

A food company in Hungary that packs milk powder and tomato powder ordered two vertical machines.

Read the case study →

Other Collar Type Machines

Same platform, different filling systems — choose by product type.

SW-420A

Collar Type

Multi-Head Weigher Granule Machine

Multi-head weigher for granule products: snacks, candy, nuts. Same collar type platform with automatic weighing system.

View Machine →

SW-420F

Collar Type

Collar Type Liquid Machine

Liquid pump filling for sauces, oils, and beverages. Same collar type frame with liquid-specific filling head.

View Machine →

SW-L200

Premade Bag

Premade Bag Powder Machine

Rotary premade bag powder machine. Uses pre-formed pouches with auger filling for premium powder packaging.

View Machine →

Get a Quote

Ready to Discuss the SW-420E/520E/620E/720E/820E?

Send us your powder type, fill weight, target speed, and bag dimensions. We will confirm suitability, recommend the correct model, and return a quotation within one business day.

info@shengweimachine.com · +86 181 2511 2025

Hellena Ji, International Sales Manager at ShengWei Machinery

Hellena Ji · International Sales Manager
Usually replies within one business day · Helps packaging buyers across 80+ countries

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