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[content] => Stratigraphy @20x.
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Overall and single layers thicknesses of PE-based material (left) and PVC-based material (right).
DSC analysis
Melting peaks of different layers (LDPE-HDPE@110-128 °C, PA@221-222 °C, PVC@268°C) useful for defining sealing conditions and polymer types.
Tensile properties
Tensile mechanical behaviour: the PE-based sample appear to be “softer” (less rigid, with higher elongation at break) than the PVC one. This may lead to different mechanical response on forming step.
Conclusions
When a new material is being tested on machines, different behaviours than classical materials could be explained by physico-chemical and mechanical lab analysis. Some results may give some hints on the counter-measures to take in order to efficiently process those new materials.
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Pharma
Characterization of PVC-free blister formable materials vs classical PVC based ones: a step towards greener pharmaceutical packaging.
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[content] => CUSTOMER’S REQUEST
Adopt a compostable material and improve shelf life of chocolate without compromising its quality.
IMA-ILAPAK
Machine engineering to process the film at comparable speed with respect to standard materials with the possibility to use modified atmosphere packaging.
FILM MANUFACTURER- SACCHITAL- SAES GROUP
Design of a paper-based high gas/moisture barrier industrial compostable film
Problem 1: Paper-based materials have higher coefficient of friction and rigidity due to fibers packing -> Parts consumption and material breaks.
Solution: folding box re-thinking both in shape and surface treatment to reduce friction effects and smoothen the bending forces.
Problem 2: standard sealing jaws micro-punctured the material.
Micro-fractures could not be detected at first. Only monitoring the O2 content over time revealed that the gas was slowly entering.
Solution: re-thinking of jaws profile (smoother) avoided puncturing, while maintaining good sealing properties.
The O2 content over time remained low, showing the disappearance of micro-holes.
Problem 3: hot sealing bars could partially melt the product inside.
Solution: ultrasonic sealing to avoid the consequences of heat application on the product.
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Food/Chocolate
Paper-based packaging: a sustainable solution for organic chocolate bars
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[content] => 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
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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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Confectionery
Horizontal Form Fill Seals
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[content] => A simple change of sealing layer composition has brought to up to more than + 50% of production speed.
The client stated that the 3 samples were the same material. DSC analysis helped to prove a difference between them (different curves, not overlapping). Interpretation of curves gave different compositions, from 16 to 32% of LLDPE in the sealing layer.
A correlation between the composition and the production speed was observed, helping to determine the most suitable composition for the application. The lab can guide the client through packaging choice.
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Tissue & Nonwoven
HFFS machine Delta 6000 for packaging of wet wipes: different speed for same material?
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