Stick Pack Machine: How It Works & Why It’s Essential for Efficient Packaging

Stick pack machines (also called stick packaging machines or stick sachet machines) are a type of flexible packaging equipment designed for single-dose or slim, bar-shaped pouches. These machines are popular in the food, beverage, and pharmaceutical industries for packing powders, liquids, or granules into narrow stick pouches. A stick pack machine turns a roll of plastic or laminated film into individual stick-sized bags: it unwinds the film, forms narrow tubes (one tube per lane), fills them with product, seals them, cuts them apart, and then discharges the finished pouches. This entire process happens vertically (like a vertical form-fill-seal machine) and can run extremely fast. For example, modern machines with multiple lanes can produce hundreds to over a thousand stick packs per minute. The portability and precise portioning of stick packs make them ideal for things like instant coffee sticks, sugar or spice sachets, and single-dose medicines.

Stick pack machines come in single-lane or multi-lane configurations. Multi-lane models have several forming tubes side by side, each creating its own stick pouch simultaneously. By running in parallel, an 8-lane machine (shown below) can output around 300–320 packs per minute. Larger machines exist too: some high-end systems can have up to 10 or even 20 lanes, yielding well over 1,000 sticks per minute. This multi-lane design lets manufacturers maximize throughput while minimizing floor space. The image below shows a multi-head stick pack machine with several lanes for high-speed packaging:

An 8-lane stick pack packaging machine filling multiple stick sachets at once – each lane has its own forming tube and sealer to increase output.

In practice, a stick pack machine follows a step-by-step cycle. Below is an overview of the key steps and components. Each part works together to form, fill, seal, and cut the stick pouches in one continuous motion. We’ll also see how the machine handles different product types (powders vs. liquids) and maintains film tension and timing.

Key Components of a Stick Pack Machine

Before diving into the process, it helps to know the main components of the machine. The table below lists the typical parts and their roles:

Most modern stick pack machines are built with stainless steel and meet industry hygiene standards (especially for food/pharma). They include features like PLC control, servo motors for precise motion, and safety guards. The excerpt below (from a manufacturer) highlights typical features including PLC control and adaptable filling systems:
“Designed to automatically package free-flowing products… complete with PLC control, servo auger, agitator and hopper, stepping motor control of bag length, printed film registration control.”

This table and list clarify how each part contributes to the machine’s function. Next, let’s put it all together in the sequence of operation.

How a Stick Pack Machine Works: Step-by-Step

Below is a simplified step-by-step flow of the packaging cycle. Each cycle starts with a new length of film and ends with finished stick sachets ready for collection. (In practice, all lanes operate simultaneously, so multiple packs are made in each cycle.)

1. Film Unwind and Feed: A roll of packaging film (often a multi-layer plastic or foil laminate) is placed on the unwinder at the back of the machine. The film is pulled forward by cross-seal jaws or nip rollers, which grip the film edges and pull it downward. The dancer arm under the unwind reels ensures consistent tension. If the machine has a coding unit, the film pauses at the printer to add date/lot codes or logos, using a sensor to align the print with where a seal will be.
2. Film Slitting/Cutting: As the film travels onward, it passes a slitting section. Here, rotating blades trim the wide roll into narrower strips. Each strip’s width matches one lane’s forming tube. For example, an 8-lane machine cuts eight side-by-side strips from the roll. The strip widths are set so that each tube will form a stick pack of the desired width. After slitting, the strips move down toward their forming heads.
3. Stick Pack Forming: Each film strip enters a forming station with a forming collar and tube. As the film crest passes the shoulder of the forming collar, the two edges wrap around the tube. The film’s edges overlap along the back of the tube. This overlap is clamped and heat-sealed by vertical sealer bars to create the rear seal of the stick pack. (If a lap seal is used, one edge lies flat over the other; a fin seal “fin” protrudes.) The portion of film above the tube becomes the front, open end of the pouch. By now, each forming tube is a sealed narrow bag open at the top.
4. Filling Product: At this point, the machine pauses briefly. The forming tubes line up under the filler. The product dispensing system – for example, an auger filler for powders or a pump/faucet for liquids – is timed to release a precise amount into each tube. Gravity (or push rods) drops the product down through the center of each tube into the open stick pouch. All lanes fill at once; common fillers include multiple augers (one per lane) or a multi-head liquid pump.
5. Vertical Sealing: After filling, the vertical bars (or jaws) press the overlap of each tube against the tube wall to complete the rear seal. Hot jaws melt-seal the edges, securing the side seam of each stick pack. This happens at each lane simultaneously. Once the vertical seal is done, each stick pouch is enclosed on three sides (back and two sides) and open at the top and bottom.
6. Horizontal Sealing and Cutting: Immediately below the filled section, a horizontal sealing bar clamps across all lanes. When it heats and seals, it closes the top of the filled pouch (and simultaneously seals the bottom of the next pouch coming up). As the bar closes, it seals a transverse line of film across the machine. Right as the bar opens, the filling stations advance the film so the filled pouch is now completely sealed. Then a knife or cutting tool moves into place. It cuts or notches between the sealed pouches to separate the finished stick pack from the rest of the film. In effect, the horizontal seal and cut create the top edge of the filled stick pack and the bottom edge of the one above it.
7. Stick Pack Discharge: The sealed stick packs, now completely formed, filled, and cut, drop down an outfeed chute. A timed flap or moving belt catches them. The packs slide onto a conveyor or directly into packaging (boxes or cartons). The chute may include guides or multiple lanes to keep the sticks aligned. Meanwhile, the process repeats: the machine pulls more film, forms the next set of pouches, and fills again. This cycle happens continuously as long as film and product are supplied.

A 6-lane stick pack machine in mid-cycle: you can see multiple forming tubes and a row of vertical seal jaws. All lanes run in parallel to multiply output.

This step-by-step flow is very similar to a standard vertical form-fill-seal (VFFS) machine, but specialized for narrow stick pouches. Because everything is vertical, products naturally drop by gravity into the forming bags, and the entire operation is compact. After the packs exit, they often move on to downstream equipment (like check-weighers or case packers) for final packaging.

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Tips for Different Products

• Powders and Granules: Stick pack machines often use auger (volumetric) fillers for powders. These measure a fixed volume in a rotating screw and drop the powder into each stick. Some machines have multiple augers (one per lane) so all lanes fill at once. Powder-free surfaces and easy-clean designs are important for hygiene.
• Liquids and Pastes: For liquids (water, syrup, creams), a liquid pump or piston filler is used. The liquid is drawn into a cylinder and released into each stick. Sanitary design (smooth stainless steel, minimal crevices) is key when packaging drinks or syrups, especially in food and pharmaceutical use. Hot sealing immediately after filling prevents leakage.
• Non-Flowing Products: Very fine powders (like flavorings or pharmaceuticals) still work with augers. Sticky or very viscous products require special pump fillers or even a piston filler that pushes a slug of product into each pack.

Every machine allows adjustment of the fill volume (dose) and pouch length (via the stepping motor controlling film feed). Operators use the PLC interface to set the desired stick length and speed. Once set up, the machine runs continuously, producing identical stick packs in each cycle.

Advantages and Industry Use

Because stick packs are so easy for consumers to use (simply tear and pour or squeeze), they are popular for single-use portions. Foods (coffee, sugar, drink mixes, condiments), personal care (cream sachets, shampoo), and pharma (powdered medicines, supplements) all use stick packs. As noted by JinLu Packing, the stick format has become popular because of its portability, ease of use, precise dosing, and cost-efficiency.

Moreover, modern stick pack machines can run extremely fast. Low-end machines might do tens of sticks per lane per minute, but high-end multilane machines can do dozens per lane. For example, a two-lane machine might run 2×80 bags/min, while an eight-lane system could push 8×40 or 8×50. As one industry article notes, “with machines that can accommodate up to 20 lanes, a single stick pack machine can produce up to 1,600 stick packs per minute – over 26 sticks per second!”. Such throughput is invaluable for large-scale producers who need consistent high-speed packaging.

Stick pack machines also save space. Even an 8-lane machine occupies far less floor area than eight separate single-lane machines. This compact design is a big reason co-packers and food companies love them. At the end of the day, the combination of high output and small footprint makes stick pack machines a favorite in the packaging world.

In summary, a stick pack machine automates the entire pouch-making and filling process: film unwinds, forms narrow tubes, product is dosed in, seals are made, and stick packs are cut and conveyed out – all in one smooth operation. By understanding the steps above, engineers and buyers can better specify or troubleshoot these machines. The inner workings (film handling, forming collars, seal bars, etc.) are based on well-proven form-fill-seal technology, but optimized for the tiny, stick-shaped pouch.

Each of these parts is adjusted to match the product and bag size. For instance, changing film grade or width, adjusting seal bar temperature, or swapping filler heads (pump vs. screw) can adapt the machine for different materials (granules, powders, pastes, etc.). But fundamentally, the cycle described above remains the same: form, fill, seal, cut, repeat.

Finally, note that stick pack machines must meet hygienic design standards in food and pharma. Sealing temperatures and speeds are tightly controlled (often via solid-state controllers and touchscreens), and the machine frame is built to allow quick cleaning. This ensures product safety and consistent bag quality.

FAQs on Stick Pack Machine

References：
1. Stick Pack Machines Deliver High Output in Small Space — Packaging Strategies
2.Vertical Form Fill Seal (VFFS) — Wikipedia
3.How Vertical Form-Fill-Seal (VFFS) Machines Are Revolutionizing the Industry — Packaging-Tech-Today