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Horizontal Form Fill Seals

High speed packaging of snacks where one material was sealing with no trouble at 300 ppm and the other one was leaking or breaking if run at the same conditions. Customer was convinced that the two films where exactly the same.

 

DSC analysis showed already a difference between the two materials (curves can’t be overlapped).
This led further inspection.

Films were different only in the kind of sealing layer where in the best performing one it was BOPP met 18 microns while in the other was Cast PP met 19 microns

The welding tests carried out in the laboratory have however confirmed different performances similarly to what happened in the machine.

Conclusions: different performances were explained with thermal, mechanical and optical tests, which proved the two materials to be different.

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