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Scratches On Folding Box
Packaging
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Outline And Impact Of Problem
• Printing products must exhibit a certain amount of resilience against the mechanical forces ofthe printing process, finishing work, and transport. Printing stock surfaces, the printing inkused, and the inline coating applied all play roles.
• When transporting printed materials for further print processing or to the end-customer, it isimportant that they be sufficiently protected so that no damage comes to the print stocksurface, the printing ink, or the coating layer.
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Challenge And Solution
• A coating that is not optimally applied can result in damage to surfaces during handling ortransport.
• This is why it is important to choose the correct varnish, and to adopt appropriate controlsduring the printing process.
• Test coatings should be performed in doubtful cases when starting on a new order.
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Case Study
• The contents of a pharmaceutical product were poured into 0.2 l glass bottles (6.75 ounce) and sealed. After being transported by truck, the recipient refused delivery citing pronounced scratch marks on the folding boxes.
• FOGRA was sent the rejected packaging, unprinted cutouts from different production runs, printing ink, and varnish samples to investigate.
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Visual Evaluation Of The Rejected Folding Boxes
• The folding boxes, protected by an aqueous coating, showed very clear scratch marks invarious spots, as seen in illustration Nr. 1.
• Numerous furrows can be seen, which partly peel back the varnish and printing ink surface,as well as the coating on the cardboard.
• These observations indicate that the damage occurred either because the cardboard surfacewas too soft, or because of some aggressive contaminant.
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Abrasion Test On The Folding Boxes
• An abrasion gauge was used to run a comparative abrasion test on samples from the rejectedbatch and on samples from earlier production runs.
• In every instance, the printing ink and varnish bonded sufficiently for an aqueous coatedproduct.
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Abrasion Test On The Folding Boxes (Cont’d)
• No differences could be established between the rejected production run and earlier productions.
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Damage to the cardboard surface from hard particles.
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Imaging With The Scanning Electron Microscope (SEM)
• One of the glittering particles was imaged using SEM. Illustration Nr. 2 shows a hard and smooth-surfaced particle, still partially embedded in cardboard.
• The form of the embedded particle indicates that this could be a glass splinter from one of the filled bottles.
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• In order to confirm this suspicion, glass splinters from one of the bottles in the delivery were imaged.
Imaging With The Scanning Electron Microscope (SEM) (Cont’d)
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Glass particles embedded in the cardboard.
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• The tests showed that the folding box prints for aqueous coating demonstrated a normal resistance to abrasion.
• Results were identical in both the earlier, acceptable delivery and in the rejected delivery.
• The hard particles observed in some cutouts, are embedded glass splinters apparently originating from the packaged bottles.
• The freedom of movement between individual packings plays a large role in cases where released particles can be dispersed.
Conclusion
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