Purpose: For automatic dosing and packaging of products into 4-seal sachet bags from a film roll.

Products: Free-flowing fine granular food products and technical materials: sugar, salt, spices, seasonings, granulated and freeze-dried coffee, granulated tea, sugar sprinkles, dietary supplements, fertilizers, agrochemicals, pharmaceutical products, and others.

Packaging materials: BOPP films, laminates, laminated paper, multilayer films. Film thickness: 20–70 µm.

Operating principle: The film is unwound from the roll and passes through a tension roller, photo mark detection zone, and a slitting knife. Using a sachet former, two strips of packaging material form the bag. Vertical seams are sealed. Then, the horizontal sealing jaws create two transverse seams and cut between them—sealing the previous bag and forming the bottom of the next one. Once the new bag is formed, the machine signals the doser to release a portion. The doser dispenses the product through a filling tube into the prepared bag. Simultaneously, the film is advanced to the required bag length. The bag length is controlled by a photo mark printed on the film, or—if the film lacks a mark—by a preset length on the machine. After the filling and pulling steps are completed, the machine initiates the next automatic cycle: the previous bag is sealed, and the bottom of the next bag is formed.

In machines with weight-based dispensers, the product dose is formed using control units that manage each individual dispenser. The product weight is measured using a load cell, and the weight of the product collected in the hopper is displayed on the control unit’s screen. Weight dispensers are more accurate compared to volumetric and screw dispensers, but they have lower productivity since the dosing process takes more time. In such dispensers, the product moves from the hopper into a feeding mechanism, which directs the product into the hopper, where it is weighed in real-time. When most of the dose is already in the hopper, the control unit reduces the feed speed and tops it off to the set dose as determined by the operator, considering the specified dosing tolerances. After the dose is formed, a check-weighing is performed, after which the control unit unloads the hopper and discharges the product into the package. Depending on the properties of the product being packaged, weight dispensers are made with different product feeding mechanisms. This can be either a vibration feeder, where the product is fed into the hopper from the bin by vibration, or a belt conveyor for more delicate or brittle products.

Operator's tasks:

The operator monitors the product level in the feed hopper, installs the film, adjusts the dose and other variable parameters, and collects finished products into group packaging (if the grouping option is not installed).

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