New Methods for Quality Analysis of Deep-Drawn Packaging Components from Paperboard

Optimization of the quality of deep-drawn cups requires methods for precise measuring of quality criteria. This paper presents new objective methods to describe the quality of deep-drawn packaging components made of paperboard. The state of the art for quality analysis in three-dimensional paperboard forming is presented. Methods for the analysis of visual quality using image analysis and for the analysis of shape accuracy using surface scans are developed. Experimental results are used for the verification of the methods and for the investigation of influences of main process parameters. The new methods are found to be both precise and objective. A large blankholder force has been shown to cause an increasing number of wrinkles and has a negative influence on the shape accuracy. A high die temperature also increases the number of wrinkles but enhances the shape accuracy. The punch temperature has no effect on the number of wrinkles, but high punch temperature has a significant and positive effect on the shape accuracy. Copyright © 2014 John Wiley & Sons, Ltd.