Перед открытием завода следует убедиться, что данное помещение отвечает следующим требованиям:
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Raw materials (polypropylene in granules) are dried and mixed in a special machine with dyes and other additives. The main additive is calcium carbonate, thanks to which the bags acquire the desired density and rigidity. If white bags are produced, calcium carbonate is better for this;
The resulting mixture enters the extruder, where it turns into a homogeneous hot mass;
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The hot mass is passed through the hole of the extruder head, then it is cooled, and as a result we get a thin film;
The film is cut into threads of a given thickness, they are removed and carefully wound onto bobbins;
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