Flow wrap packaging is one of the fastest and most efficient methods for packaging individual products in industries such as food, pharmaceuticals, cosmetics, stationery, and consumer goods. By using a continuous roll of flexible film, a flow wrap machine creates sealed pillow packs that protect products, improve shelf presentation, and support high-speed production.
If you’ve ever wondered how flow wrap machines work, this guide explains every stage of the process—from product infeed and film forming to sealing, cutting, and discharge. We’ll also explore the main machine components, the difference between fin seals and lap seals, the types of products best suited to flow wrapping, and common packaging issues to watch for.
A flow wrap machine packages products by continuously feeding them through a series of automated stations. Each stage of the process is designed to produce consistent, professionally sealed packages at high production speeds while minimising waste and downtime.
The packaging process begins when products enter the machine using either a manual loading system or an automated infeed conveyor. Products are spaced evenly using timing belts or flighted conveyors to ensure each item reaches the sealing area at the correct position.
Accurate product spacing is essential. If products are too close together or unevenly positioned, the machine may produce poorly sealed packages or incorrect cut lengths. Modern servo-driven flow wrap machines automatically synchronise product movement with the packaging film for maximum accuracy.
A roll of flexible packaging film is mounted onto the unwind shaft at the rear of the machine. As products move through the system, the film is unwound under controlled tension.
Guide rollers and tension control systems ensure the film feeds smoothly without stretching or wrinkling. Maintaining consistent film tension helps produce straight seals and professional-looking packages.
The flat packaging film passes through a forming box (also called a forming collar), which folds the film around the product to create a continuous tube.
At this stage, the product is completely enclosed by the packaging material while remaining open along one edge for longitudinal sealing.
Once the film has been formed around the product, heated sealing wheels create a continuous seal along the length of the package. This is known as the longitudinal seal and forms the back of the finished pack.
The quality of this seal depends on the correct combination of temperature, pressure, and sealing time. Properly adjusted settings produce strong, consistent seals while preventing film damage.
Flow wrap machines typically produce either a fin seal or a lap seal, depending on the product requirements and packaging film being used.
| Feature | Fin Seal | Lap Seal |
|---|---|---|
| Film Edges | Folded together | Overlapped |
| Appearance | Raised seam | Flat, neat finish |
| Film Usage | Slightly more film | Slightly less film |
| Typical Applications | Bakery, snacks, confectionery | Premium retail products and printed packaging |
Fin seals are widely used because they are simple, reliable, and suitable for many food products. Lap seals create a flatter, cleaner appearance and are often preferred where presentation is especially important.
As the wrapped product continues through the machine, rotating crimp jaws seal both ends of each package simultaneously.
Heat and pressure create airtight end seals while also defining the final package length. These end seals give flow wrapped products their familiar pillow pack appearance.
After the end seals are completed, a rotary cutting knife separates each package from the continuous film tube.
Many flow wrap machines use photo-eye sensors to detect printed registration marks, ensuring logos, graphics, and product information are accurately positioned on every package.
Finished packages exit the machine via the discharge conveyor. Depending on the production line, products may then pass through metal detectors, checkweighers, vision inspection systems, or automatic cartoning equipment before being packed for shipping.
Every flow wrap machine consists of several key components that work together to create high-quality, consistent packaging.
| Component | Function |
|---|---|
| Infeed Conveyor | Feeds products into the machine at the correct spacing. |
| Film Unwind System | Holds and dispenses the roll of packaging film. |
| Tension Rollers | Maintain consistent film tension throughout the process. |
| Forming Box (Forming Collar) | Wraps the flat film around the product to create a tube. |
| Longitudinal Sealing Unit | Creates the continuous back seal along the package. |
| End Crimp Sealing Jaws | Seal both ends of each package. |
| Rotary Cutting Knife | Separates individual packages. |
| Discharge Conveyor | Transfers finished packages to the next production stage. |
| PLC & HMI Control System | Allows operators to monitor and adjust machine settings. |
Each component plays an important role in maintaining packaging quality, production speed, and machine reliability. Routine maintenance and regular inspections help ensure consistent performance and minimise downtime.
Flow wrap machines are purpose-built machines that can use punnets and trays for the flow wrapping of goods in many industries. Products like fresh produce, pastries, bakery goods, confectionery, consumer goods like scratch cards, stationery, and magazines, and household goods like napkins and disposable cutlery can be flow-wrapped to protect against damage. Additional gas flushing can replace oxygen with nitrogen inside the packaging to preserve goods’ shelf life.
A flow wrapping machine, also known as a horizontal flow wrapper, is a packaging machine designed to wrap products in a continuous flow of material. This type of machine is widely used in various industries, including food, pharmaceuticals, and consumer goods, to package items quickly and efficiently. Here’s how it works and its main components:
Learn more in our Benefits of Flow Wrap Machines guide.
Flow wrap machines seal products inside a neat pillow-shaped film or foil package to improve shelf life and guard against contamination. Typically, an infeed conveyor belt transports goods into a forming box that forms a continuous film tube around products. Next, a rotary heat sealer and cutter will separate and crimp seal goods to form individually packaged products that are primarily rectangular or square-shaped with a horizontal back seal and top and bottom vertical seals.
A flow wrap packaging machine — also known as a horizontal flow wrapper — is an automated packaging system that wraps products in a continuous film horizontally. It then seals and cuts the film into neat, individual packages. These machines are widely used for fast, efficient packaging in industries such as food, consumer goods, and pharmaceuticals.
Flow wrap machines feed products into a conveyor, guide a roll of film around them, and then create a longitudinal seal along the back. The ends are then sealed and cut to produce individual packages, often in the classic “pillow pack” shape.
Flow wrap machines can package a wide variety of products, including:
Bakery and confectionery items
Fresh produce and snack bars
Consumer goods like stationery
Pharmaceuticals and medical devices
Household products like napkins or disposable cutlery
These machines are compatible with several film types, such as PET (Polyethylene Terephthalate), PE (Polyethylene), and BOPP (Biaxially Oriented Polypropylene). The choice depends on the product requirements, shelf life needs, and branding considerations.
Yes — flow wrap machines are highly adaptable. They can be custom configured to handle various product sizes and shapes, and can also be integrated with conveyors, trays or punnets for specialised applications.
Key advantages include:
High Production Speed: Packages many products per minute.
Efficiency: Lowers material waste and labour costs.
Versatility: Suitable for many product types.
Protection: Provides moisture and contamination protection for goods.
Professional Appearance: Creates consistent, retail-ready packages.
Gas flushing replaces oxygen inside the package with nitrogen. This slows oxidation and helps products stay fresh longer — especially useful for perishable items like baked goods and fresh produce.
Yes. Flow wrap machines can be integrated with upstream and downstream equipment like conveyors, weighers, printers or inspection systems to create a complete automated packaging line.
Most modern machines feature user-friendly touch screen controls, automatic fault detection and are built from easy-clean stainless steel. Routine maintenance typically includes cleaning and regular checks to ensure optimal performance.
Yes — SA Packaging Machinery provides comprehensive after-sales support including installation assistance, operator training, and technical maintenance support so you can get the most out of your investment.
