Vertical form, fill, and seal machines (VFFS) represent a cornerstone in the packaging industry, offering efficient and versatile solutions for various products. These machines operate by forming a package from a roll of film, filling it with the product, and sealing it, all in a vertical orientation. This method maximizes space and speed, making it ideal for high-volume production. The significance of VFFS packaging machines lies in their ability to enhance productivity while ensuring consistent quality.
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In this article, we will explore five of the top benefits of vertical form, fill, and seal machines and why System Packaging should be your go-to source for VFFS technology.
In modern industry packaging, there is no scope but efficiency and correctness. The most ubiquitous of today's most utilized package machines is the Vertical Form Fill Seal or VFFS machine. The highly automated package is of tremendous value in package manufacturing of food, pharmaceutical, and industrial products, making quick and cost-saving processes possible. This article takes a closer look at the working principle of VFFS packing machines, their components, applications, and key factors to consider when choosing one. Additionally, we will highlight Kenwei’s advanced VFFS packaging solutions and their role in optimizing production efficiency.
A Vertical Form Fill Seal (VFFS) is an automated package system used to efficiently package products of various natures into bags or pouches. It makes a bag out of a roll of film, fills it with a product, and seals it vertically in one movement.
A VFFS packing machine accomplishes this by taking a flat roll of package film, making it into a vertical tube, closing off its seams, filling its formed bag with product, closing it up to make it into a finished package, and repeating this process efficiently and accurately, making it ideal for mass manufacturing.
A typical vertical form fill and seal machine consists of many key pieces of equipment
Most businesses employ vertical form fill packaging because it is cost-effective and efficient and preserves valuable floor space. The packaging turns a roll of packaging film into finished, sealed bags very efficiently—up to 160 bags per minute, actually.
Each process has precise mechanisms to ensure correctness and efficiency. We describe each stage in greater detail below.
Vertical form fill and seal machines begin with a large roll of packaging material, known as roll stock, mounted on a spindle assembly at the rear of the machine. The material, called the film web, can be polyethylene, cellophane laminates, foil laminates, or paper laminates.
As the machine operates, film transport belts pull the film from the roll, guiding it to the forming tube at the front of the machine. Some models use sealing jaws instead of belts for film transport. A motor-driven surface unwinds wheel (power unwind) for heavy film rolls assists in unwinding, ensuring smooth operation.
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During transport, the film passes over a dancer's arm, a weighted pivot arm equipped with rollers. This system maintains consistent film tension, preventing misalignment as the film moves through the machine.
If required, the film then moves through a printing unit that can be thermal or ink-jet. The printer applies date codes, registration marks, logos, or other essential details on the film before forming the bag.
Next, the film travels past a registration photo-eye that detects printed registration marks, ensuring precise positioning and correct cutting. Additionally, film tracking sensors monitor film alignment and adjust the film carriage as needed to maintain proper positioning.
The film is guided over the forming tube’s shoulder (collar), folding it into a cylindrical shape with overlapping edges. A vertical seal is then applied to bond these edges together, forming the bag. The seal can be a lap seal (overlapping edges for a flat seam) or a fin seal (sealed along the inner edges, creating a raised seam). A rotary encoder measures the film’s movement and signals the system to stop or continue based on the set bag length.
Once the bag is formed, the machine applies heat to create a vertical seal along the overlapping edges. Intermittent machines briefly pause for sealing, while continuous machines seal without stopping.
Next, horizontal sealing jaws close to form the top seal of one bag and the bottom seal of the next. Some continuous motion machines use dual sets of jaws for increased speed. Ultrasonic sealing can be used for heat-sensitive products, which bond the layers through high-frequency vibrations instead of heat.
While the sealing jaws are closed, the product is dispensed into the bag through the hollow forming tube. This is done using a filling system such as a multi-head scale or auger filler, which must be purchased separately from the VFFS packing machine.
Once the product is inside, a cutting knife within the horizontal jaw cuts through the bag. After it is filled and sealed, the bag is dropped onto a container or conveyor. It can then continue to additional packaging processes such as weighing, X-ray inspection, or cartooning.
These machines automate package processes, offering rapid throughput, precise filling, and assured closing, making them an integral part of modern package technology.
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