FFS Films are specifically engineered to withstand the demands of automatic bag-making, filling, sealing, handling, and transportation. One of the most important properties is adequate mechanical strength. The film must be strong enough to contain the packaged material without tearing or failing during filling and handling. Flexibility is also essential because the film needs to pass smoothly through the packaging machine, form the required bag shape, and adapt to the product being filled. Excessively stiff or unsuitable film can cause feeding, forming, or sealing problems. Heat-sealing performance is another critical property. The film must form reliable seals under the operating conditions of the FFS machine. Proper seal strength helps prevent leakage, contamination, and accidental opening during transportation. Puncture and tear resistance are particularly important for packaging heavy, sharp-edged, abrasive, or granular products. Fertilizers, minerals, chemicals, polymers, and construction materials may place significant mechanical stress on the bag.
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