Tremendous changes are ongoing within the caps and closures application areas for many reasons. The ambition for a sustainable future and a circular economy is the main driver.
These developments include:
New design where “non detachable caps” EU target is a driver for design change
Introduction of new high performing cap raw materials where current application test scheme is insufficient
Design caps for liquid food, cosmetics and chemicals
Introduction of Post-Consumer Recyclate
Design driven changes for a more sustainable cap solution
To contribute to this important future development a full application performance centre C&C has been developed by Norner.
For beverage caps we produce caps for PCO1810 bottle finish on our high-performance injection moulding machine. During production processing performance, cycle potential and energy consumption can be measured. The caps are then tested in a high capacity test set up that include:
Cap dooming under pressure (i.e. 6 bar)
Leakage tests like Secure seal test or CO2 retention
Environmental stress crack of cap (ESCR) under relevant pressure.
For the food, cosmetics and chemical, we produce a “flip-top” cap in a 4-cavity mould. The flip-top has different surface finish in the cavities for supporting the development in a design driven market area. The processing trial includes de-moulding behaviour, pressure requirements and flow characteristics, odour released during production and more. The produced caps are tested by using several tests and methods that include:
Hinge Torque strength
Hinge Tensile test
Hinge fatigue test
Response of Colour MB in performance
Tests done on the products produced by PCR materials show high variations in performance and processing. So the material selection for a cap can be demanding and should be supported with well documented trials.