3 Side Seal Pouch Packing Machines
Ten ShengWei machines — five collar-type sachet lines and five vertical form-fill-seal lines — producing flat 3-side seal sachets from rollstock film. Three sealed edges plus one folded edge gives the lowest film cost per bag and the most compact flat format on the shelf. Used worldwide for sugar, salt, spice, ketchup, sauce, snack, candy, and dried fruit single-serves at 20–150 bags/min depending on lane count.
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20–150Bags / Min
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±0.5–1%Filling Accuracy
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SUS304Stainless Steel
Quality
CE Certified · SUS304
Source
Factory Direct · Guangdong
Customization
OEM · Voltage · Language
After-Sales
2-Year Warranty · 24 h Support
What product categories use 3-side seal sachets?
Single-serve, trial-size, and hospitality formats dominate the 3-side seal market — any product where bag cost per unit matters more than premium shelf appeal. Below are the four largest 3-side seal product categories on ShengWei lines, each mapping to a specific filling system in the lineup.
Spice & Seasoning
Chili powder, salt, sugar, MSG, ground spices, soup base. The largest 3-side seal segment by volume — runs on auger powder lines (SW-420E) at 25–60 bags/min in 30–200 g sachets.
Snack & Biscuit
Stick biscuits, mini crackers, coated peanuts, wafers, cereal bars. Multi-head weigher (SW-420A series) handles fragile snacks at 30–80 bags/min in 50–300 g portion bags.
Dried Fruit & Nuts
Trail mix, raisins, mango slices, cashews, granola in 30–200 g impulse-buy sachets. Linear weigher or measure cup (SW-320C / SW-320D) at 30–70 bags/min.
Candy & Confectionery
Gummies, hard candy, jelly bites, fruit chews. Zipper-reseal option on 3-side seal converts an impulse pack into a daily-use SKU — see zipper pouch machines for the configuration.
Ten ShengWei machines produce 3-side seal sachets.
Two production routes deliver the same 3-side seal sachet. Collar-type lines draw rollstock film over a metal collar, form the bag around it, and fill in a single rotary action — ideal for medium-speed sachet production with versatile filling systems. Vertical form-fill-seal (VFFS) lines form the bag from rollstock and fill in a continuous downward pass — ideal for high-speed multi-lane production. Pick by speed, lane count, and filler type.
Multi-Head Granule Weigher
10 or 14-head combination weigher with vibration trays for fragile snacks — chips, biscuits, candy, nuts, coated peanuts. Pre-forms the bag from rollstock film over a metal collar, then fills in a single rotary cycle. Three model variants 420 / 620 / 820 mm cover sachet to mid-size bag widths.
View Granule Line →
Auger Powder Filler
Servo-driven auger screw with vibrating funnel for dust-free powder feeding. Anti-leak nozzle prevents contamination on fine spice, chili powder, flour, milk powder, supplement mixes. Two bag-width variants 420 / 620 mm; ideal for 30–500 g sachets at hospitality and retail single-serve scale.
View Powder Line →
Liquid & Sauce Filler
Piston pump filler with anti-drip valve for ketchup, salad dressing, soy sauce, edible oil, juice. Optional heated jacket for high-viscosity sauces and chocolate. CIP-ready stainless contact parts for daily wash-down on food-grade lines.
View Liquid Line →
4-Head Linear Weigher
4-head linear scale ideal for fine free-flowing granules and small fills — sugar, salt, MSG, fine candy beads, instant coffee crystals. Lower CapEx alternative to multi-head combination weighers when accuracy demand is moderate (±1.5%) instead of high-precision.
View Linear Line →
Measure Cup Filler
Volumetric measure-cup filler — the most economical solution for free-flowing granules and beans where weight tolerance ±2–3% is acceptable. Quick changeover between cup sizes via tool-less swap. Best for rice, lentils, beans, regular granule snacks at entry-level CapEx.
View Cup Line →
6-Column High-Speed
Six parallel lanes triple per-machine output for small sachets — strawberry jam, instant coffee, ketchup single-serves, sample sachets. Multi-pump filling station fills all 6 lanes simultaneously. Highest throughput in the lineup at 60–150 total bags/min.
View 6-Column →
Triangle Bag Vertical
Triangle / pyramid pouch shape for tea bag, coated nuts, hard candy, jelly bites. Distinctive on-shelf appearance differentiates premium SKUs from rectangular sachets. Single-lane production with multi-head weigher feeding the triangular forming tube.
View Triangle →
Pendular Small Granule
Pendular feeder oscillates between two positions for accurate dosing of small free-flowing granules — sugar, salt, candy beads, coffee beans, sesame, fennel seed. Compact footprint suits tight factory layouts. Lower CapEx than full multi-head weigher for sub-50 g sachets.
View Pendular →
Single-Lane Vertical
General-purpose single-lane vertical machine for medium-volume 3-side seal production at larger bag widths than collar-type can handle. Accepts multi-head weigher, auger, or measure cup filling stations — switch by changing the upper module. Best for 100–500 g coffee, spice, or nut bags.
View SW-1328 →
Reciprocating High-Speed
Reciprocating jaw motion enables continuous high-speed production at smaller fill weights — coffee stick pack, sample sachet, instant drink mix mini-sachets. PLC syncs film draw, fill, and seal in one synchronized cycle. Best for high-volume single-SKU production runs.
View Reciprocating →Specifications: 4 Representative Machines
Below are four machines covering the main filler types: collar-type granule, collar-type powder, multi-lane vertical high-speed, and single-lane vertical. Full specs for the remaining six machines are available on each model’s detail page (see machine lineup above).
| Spec | SW-420A / 620A / 820A | SW-420E / 620E | SW-A6 (6-Lane) | SW-1328 |
|---|---|---|---|---|
| Bag Pattern | 3-side seal | 3-side seal | 3-side seal | 3-side seal |
| Bag Width | 50–200 mm | 50–200 mm | 30–80 mm (per lane) | 80–320 mm |
| Bag Length | 60–300 mm | 60–300 mm | 50–180 mm | 100–380 mm |
| Fill Range | 10–1000 g | 10–1000 g | 1–30 g/lane | 30–1500 g |
| Speed | 30–80 bags/min | 25–60 bags/min | 60–150 bags/min | 30–50 bags/min |
| Filler Type | Multi-head weigher | Auger screw | Pump / piston (liquid) | Multi-head / cup / auger |
| Material | SUS304 | SUS304 | SUS304 | SUS304 |
| Power | 4.0 kW | 3.5 kW | 5.5 kW | 3.8 kW |
When to choose 3-side seal vs alternatives
3-side seal is the cheapest flexible format and the workhorse of single-serve. But if you need shelf presence, daily-use reseal, or 200+ bags/min on a single SKU, another bag style may serve you better. Honest trade-off below.
3-Side Seal Sachet
- Lowest material cost per unit
- Compact flat format for bulk transport
- Best for single-serve and trial sizes
- Wide industry use (food, hospitality, samples)
- Optional zipper for daily-use reseal SKUs
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Stand-Up Pouch (Doypack)
- Excellent shelf presence and vertical face
- Self-standing for premium retail impact
- High barrier protection options
- Resealable zipper for daily-use SKUs
- Higher film cost per bag
Back-Seal Pillow Pouch
- Highest production speed (200+ bpm)
- Cost-effective for high-volume single SKUs
- Common in flow-wrapped chips and candy
- Lightweight and compact for shipping
- Single-fin seam down the back
FAQ
What’s the smallest sachet size you can run on a 3-side seal machine?
On the SW-A6 multi-lane VFFS, individual sachets can go down to 30×50 mm with 1–5 g fill (sugar / salt / coffee creamer single-serves). Collar-type single-lane machines (SW-420 series) start at 50×60 mm. Below 30 mm width, consider 4-side seal stick packs instead — see our 4-side seal stick pack page.
Can I run liquid in 3-side seal sachets?
Yes. The SW-420F collar-type liquid machine and the SW-A6 multi-lane vertical both fill liquids and viscous sauces (ketchup, salad dressing, oil, soy sauce, jam) in 3-side seal sachets. Piston pumps and time-pressure fillers are both available depending on your viscosity. Pillow-pouch fin-seal is the alternative for very-high-speed liquid; see back-seal pillow pouch.
How does collar-type compare to vertical form-fill-seal for 3-side seal output?
Collar-type lines (SW-420 series) draw the film over a metal collar, fill in a rotary cycle, and run 25–80 bags/min single-lane. Vertical form-fill-seal lines (SW-A6, SW-1328, SW-2830B) form the bag from rollstock in a continuous downward pass and run 30–150 bags/min, with multi-lane configurations multiplying lane output. Pick collar-type for versatile single-lane sachets up to 320 mm width, vertical for high-speed multi-lane single-serve. See collar-type machines and vertical machines categories.
Can a 3-side seal sachet have a zipper for resealable hospitality items?
Yes — gummy candy, chewy snacks, dried fruit, and pet treats all use 3-side seal with press-to-close zippers. The zipper is added to the rollstock film by your bag converter or as an in-line module on the machine. See our zipper pouch packing machine page for the zipper module configuration and supported zipper types.
What films and laminates work with 3-side seal sachets?
3-side seal sachets accept PET/PE, PET/AL/PE (foil laminate for high-barrier), kraft paper laminate (for premium positioning), recyclable mono-PE, OPP/PE for low-cost SKUs, and metallized films from 50–120 micron thickness. Sealing temperature, jaw pressure, and dwell time are all adjustable per film type via the HMI. Ship a sample bag and product to our Guangdong factory for a sealing test before commitment.
What’s the typical cost per sachet?
3-side seal has the lowest film cost of any flexible format — typically USD 0.005–0.015 per bag at standard 1–10 g fill weight, depending on film grade, print, and order volume. Cost scales with bag size, barrier requirements, and zipper option. Multi-lane high-speed lines (SW-A6) reduce labor cost per bag substantially compared to single-lane.
Lead time and payment terms?
Standard lead time 25–35 working days from deposit confirmation to FOB Shantou for any of the 10 machines. Payment: 30% deposit, 70% before shipment by T/T. Custom configurations (special voltage, multi-language HMI, additional weighing stations, zipper modules) may add 5–10 days. Sea freight transit: SE Asia 7–14 days, Middle East 18–25 days, Europe 30–40 days. ShengWei has been building these lines in Guangdong since 2003.
Can I run a sample test before commitment?
Yes. Ship 2–5 kg of your product (powder, granule, liquid, or solid) plus a sample bag to our Shantou factory. ShengWei runs a packing test on the actual machine, records video of the run, and shares results with recommended speed and fill settings. Reach our sales team via the contact page for the shipping address.
Ready to spec your 3-side seal sachet line?
Send us your product type, sachet dimensions, and target output. Our engineers reply within 12 hours with a sized quote, layout drawing, and sample-test plan tailored to your line — collar-type or vertical, single-lane or multi-lane.
info@shengweimachine.com · +86 181 2511 2025
