- Flow wrap packaging (flowpack) uses a continuous horizontal sealing process to wrap products in flexible film at high speed.
- Two main machine orientations exist: horizontal flow wrappers (HFFS) and pillow-pack variants for soft or irregular items.
- Common materials include BOPP, PE, PET, and OPP films — each offering different barrier, clarity, and sealing properties.
- Flow wrapping is used across food, pharmaceutical, bakery, confectionery, and personal care industries.
- Modern flowpack machines can run at 1,000+ packs per minute and integrate with upstream and downstream automation lines.
What Is Flow Wrap Packaging?
Flow wrap packaging — commonly called flowpack — is a high-speed flexible packaging process in which a continuous roll of film is formed around a product, sealed, and cut into individual packs on a horizontal flow wrapper machine. The result is a tight, pillow-shaped or fin-sealed package that protects the product from moisture, oxygen, and physical damage while maintaining strong shelf presence.
Flowpack is one of the most widely used packaging formats in the food industry, accounting for a significant share of global flexible packaging volume. Its combination of speed, material efficiency, and versatility makes it the go-to choice for everything from chocolate bars and biscuits to fresh produce and pharmaceutical blister strips.
The term "flowpack" derives from the continuous "flow" of film through the machine and the wrapping (packing) action that forms the seal around the product. In North American markets the equivalent term is "flow wrapper" or "horizontal form-fill-seal" (HFFS), though subtle technical distinctions exist between the two categories.
How Flow Wrapping Works
The flow wrapping process follows a precise sequence that transforms a flat film reel into a sealed consumer pack in a fraction of a second:
- Film unwind: A flat roll of packaging film feeds continuously through tensioning rollers to maintain consistent film tension.
- Forming: The film passes over a forming shoulder that bends it into a U-shape around the product lane. Products are fed at precisely timed intervals from an infeed conveyor.
- Longitudinal seal: The two edges of the film are sealed together along the bottom using a heated sealing bar or rotary sealing wheel, creating a continuous film tube around the product stream.
- End sealing and cutting: Heated jaw sealers clamp across the film between products, forming front and back seals simultaneously while a blade cuts individual packs free.
- Pack discharge: Finished packs exit on an outfeed conveyor for downstream checkweighing, metal detection, date coding, and case packing.
The entire sequence typically takes less than one second per pack at normal operating speeds. Modern servo-driven machines allow rapid changeovers between pack lengths by adjusting software parameters rather than mechanical components.
Types of Flow Wrap Packaging
Horizontal Flow Wrappers (HFFS)
Horizontal flow wrappers are the most common flowpack configuration. Products are conveyed horizontally on a flat belt or lug chain, making this format ideal for rigid or semi-rigid items that can be placed on their flat side — biscuits, cereal bars, cheese portions, frozen meals, and pharmaceutical blister cards. The horizontal orientation provides excellent product stability and supports integration with upstream slicers, depositors, or robotics.
Pillow Pack
The pillow pack is the simplest and most cost-effective flow wrap format. The fin seal runs along the bottom center of the pack and the end seals form perpendicular gussets, creating the characteristic "pillow" shape. It is widely used for bakery products, confectionery, frozen items, and any product where throughput and economy take priority over premium aesthetics.
Gusseted / Boxed Pack
Gusseted flow packs include side pleats pressed into the film before end sealing, creating a rectangular cross-section that stands upright on shelf. This format is common for bread rolls, muffins, pet treats, and hardware items where flat-base stability is required for retail display.
Overwrap
Flow wrap overwrapping places a pre-filled tray, box, or product cluster inside the film rather than forming the film directly around loose product. It is used for ready-meal trays, multipacks, and gift sets where an inner container provides structural support and the outer flowpack adds barrier protection and branding surface area.
Stretch Film Flow Wrap
Stretch film variants use an elastic film stretched over the product under controlled tension, providing a close-fitting, high-clarity wrap suitable for fresh produce, meat cuts on trays, and deli items. Unlike heat-sealed flowpack, stretch film relies on film memory and cling properties for containment.
- You need high-speed output (500–1,200 packs/min) with consistent seal quality
- Your product is rigid or semi-rigid and can be conveyed horizontally
- Material savings matter — flowpack typically uses 15–25% less film than bag-in-box formats
- You require hermetic sealing for extended shelf life
- Pack length flexibility is important across a mixed product range
Film Materials Used in Flowpack
BOPP (Biaxially Oriented Polypropylene)
BOPP is the single most widely used flowpack film material globally. Its excellent optical clarity, low cost, high stiffness, and good sealability make it the default choice for confectionery, snacks, and bakery. BOPP provides moderate moisture barrier but limited oxygen barrier — a limitation addressed by BOPP/PVDC or metallized BOPP laminates when extended shelf life is required.
PE (Polyethylene) Laminates
Polyethylene-based structures — including LDPE, LLDPE, and cast polypropylene (CPP) — dominate fresh food and frozen applications. PE’s inherent flexibility, toughness at low temperatures, and excellent heat-seal performance make it suitable for fresh produce, dairy, and meat applications. Mono-material PE structures are increasingly preferred for their recyclability under flexible film collection schemes.
PET / PET Laminates
Polyester (PET) films bring exceptional tensile strength, thermal stability, and optical clarity to high-barrier flowpack applications. PET is typically laminated with PE or CPP sealing layers and combined with aluminium foil or EVOH barriers for pharmaceutical, medical device, and premium food applications where low oxygen transmission rates are required.
Recyclable and Sustainable Film Structures
Driven by EPR regulations and the EU Packaging and Packaging Waste Regulation (PPWR), the packaging industry in 2026 is accelerating adoption of mono-material recyclable flowpack structures. All-PP and all-PE laminates now deliver comparable barrier performance to mixed-material films while qualifying for existing flexible film recycling streams.
Industry Applications
| Industry Sector | Typical Products | Film Type | Speed Range |
|---|---|---|---|
| Confectionery | Chocolate bars, sweets, gum | Metallized BOPP, OPP | 400–800 ppm |
| Bakery | Biscuits, croissants, bread rolls | BOPP, PP laminate | 300–600 ppm |
| Snack Food | Cereal bars, protein bars, crackers | BOPP/PE, metallized BOPP | 300–700 ppm |
| Fresh Produce | Cucumber, corn cobs, herbs | Micro-perforated BOPP/PE | 100–300 ppm |
| Frozen Food | Fish portions, veggie burgers | PE laminate, CPP | 200–500 ppm |
| Pharmaceuticals | Blister strips, device pouches | PET/PVDC/PE, Alu laminate | 100–400 ppm |
| Personal Care | Soap bars, wipes, cosmetics | PP, PE, PET | 200–600 ppm |
Flow Wrap vs. Other Packaging Methods
| Feature | Flow Wrap (HFFS) | VFFS | Thermoforming | Tray Sealing |
|---|---|---|---|---|
| Product suitability | Rigid/semi-rigid, slabs | Granules, liquids, powders | Portioned solids | Tray-packed items |
| Film usage | Low–medium | Medium | Low (bottom web + lid) | Low (lid film only) |
| Speed (ppm) | 200–1,200 | 50–200 | 10–60 cycles/min | 20–120 trays/min |
| MAP capability | Limited | Yes (gas flush) | Yes (full MAP) | Yes (full MAP) |
| Changeover time | 5–20 min | 10–30 min | 30–90 min | 15–45 min |
Machine Specifications
| Parameter | Entry-Level | Mid-Range | High-Performance |
|---|---|---|---|
| Output speed | Up to 200 ppm | 200–600 ppm | 600–1,200+ ppm |
| Pack length range | 80–350 mm | 60–400 mm | 50–500 mm |
| Film width | 100–350 mm | 100–500 mm | 100–700 mm |
| Drive system | Mechanical cam | Servo-assisted | Full servo multi-axis |
| Changeover | Manual, 30–60 min | Semi-auto, 15–30 min | Automatic, <10 min |
| Connectivity | Basic HMI | OPC-UA / SCADA ready | Full Industry 4.0 / OEE tracking |
Sustainability Considerations
The sustainability profile of flow wrap packaging in 2026 is being reshaped by EPR regulations and the EU PPWR, which require producers to fund end-of-life collection and recycling of flexible packaging. Key developments include:
Mono-material structures: Major film suppliers have commercialized certified mono-PE and mono-PP flowpack grades that achieve recyclability ratings under RecyClass and How2Recycle frameworks without sacrificing shelf life or machine runnability.
Downgauging: Modern high-performance flowpack machines with servo tension control can run films as thin as 15–18 microns — 20–30% thinner than industry average — reducing material use and carbon footprint per pack.
Compostable films: PLA and cellulose-based flowpack films have gained commercial traction in certified compostable fresh produce applications, particularly in the EU where industrial composting infrastructure supports home and industrial compostable claims under EN 13432.
For further reading on sustainable packaging material choices, see the Sustainable Packaging Materials: The 2026 Selection Guide. For the specific machinery context of horizontal form-fill-seal, the Form Fill Seal (FFS) Packaging: VFFS vs HFFS Complete Guide provides additional technical depth. For products requiring MAP-compatible packaging, Modified Atmosphere Packaging (MAP): Complete Guide covers gas composition and equipment selection in detail.
Frequently Asked Questions
What is the difference between flowpack and HFFS?
The terms are often used interchangeably. Technically, HFFS (horizontal form-fill-seal) describes the process category, while "flowpack" refers to the specific pillow-pack or fin-seal format produced by an HFFS machine. All flowpack machines are HFFS, but not all HFFS machines produce classic flowpack formats.
What products are best suited to flow wrapping?
Flow wrapping best suits products that are rigid enough to be conveyed horizontally without deforming — biscuits, chocolate bars, fresh produce, cheese portions, pharmaceutical blister cards, and consumer electronics accessories. Soft or free-flowing products are better served by VFFS machines or premade pouch fillers.
Can flowpack machines run at modified atmosphere?
Standard flowpack machines are not optimized for MAP because achieving consistent gas flush in a continuously moving film tube is difficult. For products requiring precise O₂ and CO₂ concentrations, tray sealing or thermoforming is the preferred solution.
What is a typical flowpack machine footprint?
A mid-range horizontal flow wrapper with infeed conveyor and outfeed checkweigher typically occupies 3–6 meters in length and 0.8–1.2 meters in width. High-speed systems with integrated robotic infeed can extend to 8–12 meters total line length.
What sealing methods are used in flow wrap packaging?
The two dominant sealing methods are: (1) fin seal — film edges are folded and sealed face-to-face, creating a protruding fin along the bottom or top; and (2) lap seal — the outer surface of one film edge seals to the inner surface of the other, producing a flat, smooth bottom seam. Lap seals are preferred for high-speed applications due to lower resistance through the sealing zone.
How do I choose between flowpack and thermoforming?
Key decision factors: product geometry (flowpack suits flat/uniform products; thermoforming suits deep-draw or irregular shapes); shelf life requirements (thermoforming delivers better MAP capability); and investment level (flowpack machines are generally 30–50% lower capital cost than equivalent-throughput thermoformers).
What film materials are recyclable in flowpack?
In 2026, certified recyclable flowpack structures based on mono-PE or mono-PP with SiOx or EVOH barrier layers are commercially available from major film suppliers. These qualify for flexible film drop-off recycling streams in the EU and US under How2Recycle and RecyClass certifications. Mixed-material laminates containing aluminium foil remain non-recyclable in current infrastructure.