Four Side Sealing Packing Machine
SW-1528 · SW-1528B · 4-Side Seal Sachet · Powder · Liquid · Paste
Compact vertical form-fill-seal machine producing flat four-side-sealed sachets from rollstock film. One platform covers two configurations: the SW-1528 with a liquid piston pump for ketchup, shampoo, honey, chili paste, and edible oil; and the SW-1528B with an inclined auger screw for milk powder, coffee, MSG, salt, and pharmaceutical powder. A dual-film-rack variant is available for continuous production with minimum downtime during film changeover. Schneider frequency drive, photocell-tracked film feed, dual seal temperature control, SUS304 product-contact surfaces, and a compact 220V single-phase power supply are standard.
Quality
CE Certified
Source
Factory Direct · Guangdong
Customization
OEM · Voltage · Language
After-Sales
2-Year Warranty · 24 h Support
SW-1528 / SW-1528B: Vertical FFS for Four-Side Sealed Sachets
The SW-1528 is a compact vertical form-fill-seal machine purpose-built for the four-side seal sachet — a flat pouch sealed along all four edges, suited to single-dose portion packs for condiments, sauces, powder supplements, and pharmaceutical products. Film unwinds from a rear-mounted roll, wraps around a forming shoulder, and is heat-sealed on two longitudinal edges and two cross edges to produce small, flat sachets that stack efficiently in shipping cartons and dispense cleanly on retail display strips.
Two configurations share the same mechanical platform. The SW-1528 uses a liquid piston pump (or optional pneumatic diaphragm pump for viscous or particulate-bearing liquids) with a 30 L 304 stainless steel hopper — ideal for tomato ketchup, honey, shampoo, edible oil, chili paste, salad dressing, and similar liquid or paste products. The SW-1528B replaces the liquid filling system with an inclined auger screw for dry powders — milk powder, coffee, MSG, chicken essence, salt, pharmaceutical powder, and spice blends. A dual-film-rack variant holds two rollstock films simultaneously, allowing continuous production through film changeover and eliminating stop-start losses on long runs.
Standard equipment includes a Schneider frequency converter with HMI rotary speed control, photocell-tracked servo film pull for precise registration with printed films, dual independent temperature controllers for longitudinal and cross seal jaws, a 4-line date printer, a double film clamp plate for stable film travel, easy-tear notch cutting, linked-bag output, and a glass safety enclosure. Film compatibility covers OPP/CPP, PET/PE, NYLON/PE, and plain PE rollstock up to 280 mm wide. For machines that produce three-side-seal sachets on a similar footprint, see the SW-1328 three-side sealing vertical packing machine.
Max Speed (Powder)
100 bags / min
Max Film Width
≤280 mm
Power Consumption
1.5–1.8 kW
| Parameter | SW-1528 (Liquid / Paste) | SW-1528B (Powder) |
|---|---|---|
| Filling System | Piston pump (optional pneumatic pump) | Inclined auger screw |
| Typical Products | Ketchup, honey, oil, shampoo, chili paste, salad dressing | Milk powder, coffee, MSG, chicken essence, salt, spice |
| Packing Speed | 40–60 bags/min | 60–100 bags/min |
| Bag Width | 25–140 mm | 50–150 mm |
| Bag Length | 50–200 mm | 25–140 mm |
| Max Roll Film Width | ≤280 mm | ≤280 mm |
| Machine Weight | ~290 kg | ~300 kg |
| Total Power | 1.5 kW | 1.8 kW |
| Voltage | 220V 50/60 Hz single phase (customizable) | |
| Bag Format | Four-Side Seal Sachet (flat, four heat-sealed edges) | |
| Control System | PLC + Schneider Frequency Converter + HMI Touch Screen · Photocell Eye Registration | |
| Sealing System | Dual temperature control (longitudinal + cross seal) · Easy-tear notch cut · Linked-bag output | |
| Contact Material | SUS304 Stainless Steel | |
| Film Material | OPP/CPP · PET/PE · NYLON/PE · PE · heat-sealable laminates | |
| Dimensions (L×W×H) | 1,260 × 960 × 1,800 mm | 1,260 × 930 × 1,600 mm (standard) 1,300 × 1,120 × 1,602 mm (dual-film-rack) |
| Safety | Glass safety enclosure · Emergency stop · Overcurrent protection | |
| HMI Languages | English · Spanish · Arabic · Russian · Korean · French · Chinese (others on request) | |
Recommended Configurations by Product
Each scenario below shows a tested configuration with expected output. The SW-1528 platform handles both dry powders and free-flowing liquids — the correct filling system is selected based on your product. Send us your product type, target dose weight, and bag size for a configuration recommendation.
Ketchup & Sauce Sachets
8–30 g single-serve condiment packs
- Config
- SW-1528 with piston pump
- Hopper
- 30 L 304 stainless steel (mix / heat options)
- Speed
- ~50 bags/min
- 8 h Output
- ≈ 24,000 bags
- Clients
- Restaurant chains, condiment co-packers, food service exporters
Instant Coffee & Milk Powder
3–20 g dry powder single-serve sachets
- Config
- SW-1528B with auger screw
- Feed
- Inclined auger for dry, free-flowing powder
- Speed
- ~80 bags/min
- 8 h Output
- ≈ 38,400 bags
- Clients
- Coffee brands, dairy processors, private label hotel amenities
MSG · Chicken Essence · Salt
2–10 g seasoning & flavour enhancers
- Config
- SW-1528B with auger screw
- Feed
- Auger dosing for fine granular powder
- Speed
- ~100 bags/min
- 8 h Output
- ≈ 48,000 bags
- Add-ons
- Date coder, dust collector, nitrogen flushing
Shampoo · Oil · Paste
5–25 g personal care & viscous liquid
- Config
- SW-1528 with pneumatic pump
- Feed
- Pneumatic diaphragm pump for viscous or particulate liquid
- Speed
- ~45 bags/min
- 8 h Output
- ≈ 21,600 bags
- Clients
- Hotel amenity OEMs, cosmetic co-packers, sample-pack manufacturers
The SW-1528 platform is dedicated to flat four-side-seal sachets. For granular products in back-seal format, see the SW-2030A back-seal granule machine. For three-side-seal sachets, see the SW-1328 three-side seal machine. For multi-lane stick pack production, see the SW-B10 ten-column back-seal machine. For larger-volume auger powder sachets in wider bags, see the SW-420E collar type auger powder machine.
Output Bag Type: Four-Side Seal Sachet
The SW-1528 / SW-1528B produces flat four-side-seal sachets — pouches heat-sealed along all four edges of a rectangular film panel. This format is the industry standard for single-serve condiment, powder, and liquid portion packs. Four-side sealing offers a tight product-to-film ratio, clean edges for easy-tear opening, and a flat profile that stacks efficiently in shipping cartons and dispenses cleanly from retail display strips.
Suitable materials — ketchup, oil, shampoo, sauce, paste, honey
Finished sachet samples — coffee, condiment, seasoning single-serve
4-Side Seal Sachet (Standard Output)
3-Side Seal Sachet (Alternative Format)
Compatible film: OPP/CPP · PET/PE · NYLON/PE · PE · heat-sealable composite laminates up to 280 mm wide. Send your film sample for sealing parameter confirmation before production.
Note: The SW-1528 produces four-side-seal sachets only. For three-side-seal flat sachets, see the SW-1328 three-side sealing machine. For back-seal stick packs or pillow sachets, see the SW-2030A back-seal granule machine.
How the Four-Side Seal Cycle Works
The forming, filling, and sealing sequence runs continuously with each sachet completed in approximately one second at full speed. A photocell eye reads the print registration mark on the film and adjusts the pull length in real time, ensuring every sachet is cut at the correct position. Both the liquid and powder configurations share the same forming and sealing mechanics — only the filling module changes between SW-1528 and SW-1528B.
01
Film Unwind & Forming
Film unwinds from the rear-mounted roll and passes through the double film clamp plate that stabilises film tension. The dual-film-rack variant loads two rolls simultaneously — when the active roll runs out, the second roll is pre-threaded for quick splice, eliminating the 30–45 minute stop normally required to load fresh film. The forming shoulder wraps the film into a flat tube around the filling spout.
02
Longitudinal Sealing
Heated longitudinal seal bars close along the two long edges of the film tube, forming the side seams of each sachet. The longitudinal seal temperature is controlled independently of the cross seal — this is important when running composite films (such as PET/PE laminates) that require different temperatures on the side seams versus the end seals. Seal jaws are designed for four-side sealing geometry.
03
Metered Filling
Product drops into the formed tube through the central filling spout. The SW-1528 uses a piston pump (or optional pneumatic diaphragm pump for viscous liquids with small particles, such as chili paste) that meters a precise volume per stroke. The SW-1528B uses an inclined auger screw whose rotation count controls the powder dose — suitable for dry, free-flowing powder such as milk powder, coffee, MSG, and salt. Mixing and heating options are available on the liquid hopper for products that separate or solidify at room temperature.
04
Cross Sealing, Cutting & Discharge
Heated cross seal jaws close across the filled tube, simultaneously forming the rear seal of the current sachet and the front seal of the next one. A blade built into the cross seal jaw cuts between sachets to separate them, and an easy-tear notch is stamped into the edge for clean opening by the end user. The 4-line date printer codes production date, batch number, or expiry information onto each sachet. Finished sachets discharge as individual units or as a linked-bag chain for downstream counting and cartoning.
SW-1528 in Operation
Three running-demo videos from real production lines — showing the four-side-seal cycle on powder, liquid, and paste applications. Contact us for a factory-acceptance test video recorded with your own product sample.
Four Core Systems That Drive Sachet Quality
The SW-1528 platform is built around four mechanical systems that determine seal integrity, dosing accuracy, and film handling reliability. Understanding these systems helps you specify the correct configuration for your product and identify which options (mixing hopper, pneumatic pump, dual-film rack) are needed before quotation. For higher-volume powder applications with wider bags, see the SW-420E collar type auger powder machine.
① Schneider Frequency Drive & Speed Control
A Schneider-brand frequency converter regulates the main motor with a HMI rotary knob for continuous speed adjustment. Smooth acceleration and deceleration protect film integrity at speed changes between SKUs — important when switching from a slow viscous paste to a fast-flowing powder on the same machine. The frequency drive also enables low-speed jog mode for film threading and maintenance.
② Dual-Zone Temperature Control
Two independent PID temperature controllers regulate the longitudinal seal bars and cross seal jaws separately. Four-side sealing requires different temperatures on side seams versus end seals — especially on PET/PE or NYLON/PE laminate films where thermal conductivity varies by seal geometry. Each zone holds set-point within ±1 °C, ensuring consistent seal quality across production runs.
③ Double Film Clamp Plate
The double film clamp plate stabilises film as it passes from the roll to the forming shoulder. This mechanism eliminates film walk, reduces wrinkling on the longitudinal seals, and simplifies film threading after a roll change. On the dual-film-rack variant, the clamp plate accommodates two parallel film paths for continuous production. Film tension is adjustable via spring-loaded dancer arms.
④ Modular Filling Head
The filling head is the only difference between SW-1528 and SW-1528B. The liquid piston pump (SW-1528) mounts above the forming spout on a quick-release bracket — replaceable with a pneumatic diaphragm pump for viscous or particulate-bearing liquids, or with the inclined auger screw (SW-1528B) for dry powder. Changing the filling head takes approximately 45 minutes and does not require modification of the base machine frame, control system, or sealing unit.
Branded Components You Can Verify
Every critical component on the SW-1528 / SW-1528B is sourced from established industrial brands. Part numbers are listed on the quotation sheet so you can verify pricing and availability independently before you order.
PLC Touch Screen Panel
Colour HMI touch screen mounted on the right side of the machine for easy operator access. Displays packing speed, bag length, longitudinal and cross seal temperature, production count, and fault codes. Seven languages standard.
Dual PID Temperature Controller
Two independent temperature loops — one for longitudinal (side) seals and one for cross (end) seals. Each holds set-point within ±1 °C for consistent seal quality on laminate films that require different side and end seal temperatures.
Inclined Auger Screw Filler
SUS304 stainless steel hopper with servo-driven inclined auger. Rotation count determines the dose — precise volumetric filling for dry, free-flowing powder such as coffee, milk powder, MSG, salt, chicken essence, and pharmaceutical powder.
Schneider Frequency Drive
Schneider-brand frequency converter with rotary speed knob on the HMI panel. Controls main motor acceleration, deceleration, and jog speed — protects film integrity during speed changes between SKUs.
4-Line Date Printer
Built-in 4-line coding mechanism prints production date, batch number, expiry, and lot code directly onto each sachet during the sealing cycle. Characters are embossed on the film for permanent, tamper-evident marking.
Double Film Clamp Plate
Dual-plate clamp assembly stabilises film tension as it passes from the roll to the forming shoulder. Eliminates film walk, reduces wrinkling on longitudinal seals, and simplifies film threading after a roll change.
Four-Side Seal vs Three-Side Seal — Which Sachet Format Do You Need?
Both formats start from rollstock film and produce flat sachets on a vertical FFS machine. The key difference is sealing geometry: four-side seal closes all four edges, three-side seal uses the folded film edge as one side. Choose based on your film cost sensitivity, seal appearance, and packaging strength requirements.
Choose Four-Side Seal (SW-1528 / SW-1528B) When:
- You need a symmetrical sachet with clean edges on all four sides for premium retail presentation
- Your product is powder, liquid, or paste (both filling configurations available)
- You need an easy-tear notch on any edge for consumer-friendly opening
- Your film has printed graphics designed around a four-panel layout
- You run moderate-volume single-dose portion packs (40–100 bags/min)
- You need dual-film-rack capability for continuous production on long runs
Choose Three-Side Seal (SW-1328) When:
- You want slightly lower film cost per sachet — three-side seal uses a folded film edge
- Your product is primarily dry granule or powder
- Your packaging design locates the tear notch at the top of the sachet only
- You prefer a simpler sealing mechanism with fewer temperature zones
When This Machine Is Not the Right Fit
The SW-1528 produces flat four-side-seal sachets only. For back-seal stick packs or pillow sachets, see the SW-2030A back-seal granule machine, SW-2030B back-seal powder machine, or SW-B10 ten-column back-seal stick pack machine. For pyramid-shaped triangle bags, see the SW-1022 triangle bag machine. For high-volume liquid sachets in three-side-seal format, the SW-420F collar type liquid machine offers a wider bag range and faster speeds. For premade stand-up pouches or spouted packs, use the premade bag packing machine family or the spout pouch filling and capping machine (SW-CCS6).
Why Choose ShengWei Machine
Factory Direct from Guangdong
Designed and manufactured in our own 11,000 m² factory in Shantou, Guangdong. No trading companies, no middlemen — you work directly with the engineers who build your machine. Factory visits welcome by appointment and sample runs arranged on the production floor.
Built-to-Order Configuration
Filling system (piston pump, pneumatic pump, or auger screw), voltage (220V, 50/60 Hz), HMI language (English, Spanish, Arabic, Russian, Portuguese, and others), dual-film-rack option, mixing / heating hopper, and accessories are all configurable per order. OEM branding available for distributors.
Lifetime Remote Support
Free remote video technical support for the life of the machine — not just the warranty period. Spare parts ship from our factory within 3 working days. On-site installation and operator training available on request (travel costs quoted separately).
80+ Export Countries
ShengWei machines are deployed in the UAE, Saudi Arabia, Nigeria, Mexico, Colombia, Indonesia, the Philippines, and 70+ additional markets — across food, condiment, pharmaceutical, and personal care industries that rely on four-side-seal sachet packaging.
What Our Clients Say
We bought the SW-1528B with the auger filler to pack 5 g instant coffee sachets for our hotel amenity line. The machine runs at around 85 bags per minute for our film and the seal quality has been consistent through twelve months of daily operation. Switching between our standard coffee blend and the instant tea product took less than ten minutes — we only change the auger speed on the HMI. The remote support team was responsive when we needed help tuning the cross-seal temperature for our laminate film.
Alejandro P.
Production Manager — Private-Label Coffee Packer, Mexico
We run the SW-1528 with a pneumatic pump for chili paste in 15 g portion sachets — our product has pepper seeds and fibre that a piston pump could not handle. The pneumatic option was exactly what we needed. The dual temperature controller is important for our PET/PE film — the side seals need 20 °C less than the end seals, and the separate zones made that easy to configure. About eighteen months of steady production with only scheduled maintenance so far.
Chinedu O.
Plant Director — Food Condiment Exporter, Nigeria
Frequently Asked Questions
What products can the SW-1528 / SW-1528B pack?
What's the difference between SW-1528 and SW-1528B?
What is the dual-film-rack variant and when do I need it?
What bag sizes and film widths are supported?
What film materials are compatible?
What voltage and HMI language options are available?
What safety features are included?
What warranty and after-sales support is included?
What is the lead time and payment terms?
Can I send a product sample for a packing test?
Expert Guides
What Is a Vertical Form-Fill-Seal Machine?
How vertical FFS machines work, what sachet formats they produce, and how they compare to horizontal flow wrap and premade bag systems.
Read Guide →Four-Side Seal vs Three-Side Seal
Film cost, seal appearance, packaging strength, and tear-notch placement compared — how to choose between the SW-1528 and SW-1328.
Compare Formats →Liquid Sachet vs Powder Sachet Packaging
Piston pump, pneumatic pump, and auger screw dosing systems explained — which filling technology fits your product viscosity and dose accuracy requirements.
Learn More →Other Seal Format & Powder Machines
Different seal formats and machine types for powder and granule products.
Six-Column Four-Side Seal Vertical Machine
Six-column four-side seal vertical machine. Same seal type in multi-lane format for high-volume sachet production.
Three-Side Seal Vertical Machine
Three-side seal vertical machine. Similar single-lane VFFS with three-side seal format option.
Premade Bag Powder Packing Machine
Rotary premade bag powder machine. Uses pre-formed pouches with auger filling for premium powder packaging.
Ready to Discuss the SW-1528?
Send us your product type (powder, liquid, or paste), target sachet size, and daily output. We will confirm the correct filling configuration — SW-1528 or SW-1528B — and return a quotation within 24 hours.
info@shengweimachine.com · +86 181 2511 2025
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