PrintoLUX > The Process > Insights > Incoming goods inspection


Thoroughness and care belong to the performance features that have given the distinction to "Made in Germany". We are committed to this tradition and check all components we use systematically for quality, functional reliability and optimisation potentials.

High priority is given especially to the incoming goods inspection at PrintoLUX® in addition to our comprehensive material tests.

We subject all PrintoLUX®-certified materials to a quality inspection prior to transfer to bin and/or further processing to ensure they will meet the high demands of our industrial labelling process. Formats of the size 120 x 160 mm are cut out at the incoming goods inspection from any batch. We clean four of these labels with PLX cleaner and PLX cleaning cloths. After the PLX cleaner has dried, PLX treatment is applied with PLX treatment cloths. After the treatment liquid has dried, the four formats are printed with our test pattern and thermally cured.

Cooling of the test pattern is immediately followed by a cross-cut test according to DIN EN ISO 2409:2007 to check the adhesion properties of the print. Close-meshed grids are cut into the surface and then brushed off. Tesa® adhesive tape 4651 is now applied to the grid and pulled off with a jerk after five minutes. The best possible result: the cut edges are smooth; no detachment is apparent. The materials satisfy our quality guidelines only if this result of category GT 0 was achieved.

Scratch resistance
This is followed by a scratch test using a pencil with hardness 6. With this test, the printed test areas are worked at least six times from left to right with the sharpened pencil and a pressure of 10 Newton (10 kg*m/s²) at a 90° angle. The proof of quality to be rendered with this test: Absolutely no ink detaches.

An extensive test of resistance against a series of chemicals forms the conclusion of the incoming goods inspection. Isopropyl, acetone, cellulose thinner, concentrated soda solution and vinegar essence (25%) are used here. The test area is subjected to 50 rubbing cycles and 20 Newton (20 kg*m/s²) rubbing pressure from left to right with the respective chemical. The incoming goods inspection has been passed if no optical changes of the printed ink/colours can subsequently be detected.

The materials are released by our Quality Assurance after the successful conclusion of the tests. Each released batch receives a batch card number. Both, the test specimens and retained samples are archived under this number. The batch card number is also indicated on the delivery notes of the plate materials being sold and on the label sheets.


Thorsten Wohninsland