by clicking the arrows at the side of the page, or by using the toolbar.
by clicking anywhere on the page.
by dragging the page around when zoomed in.
by clicking anywhere on the page when zoomed in.
web sites or send emails by clicking on hyperlinks.
Email this page to a friend
Search this issue
Index - jump to page or section
Archive - view past issues
FLEXO Magazine : March 2008
20 FLEXO MARCH 2008 www.flexography.org In this age of rocket science, why can't we predict surface per- formance on folding cartons? It is a safe bet that the No. 1 issue in folding carton coatings involves surface performance as measured by slide angle and COF (coefficient of friction). This certainly has to be true for cartons subjected to high-speed form- ing, filling and sealing. The demanding nature of these packaging operations underscores the need for surface specifications that are reliable and predictable. Yet today, with all the technical resources avail- able to board mills, coating manu- facturers and the carton converting industry, the issue requires constant attention with no little frustration for everyone involved. This article attempts to shed light on the subject of folding carton coatings, and to pro- vide some useful information. THE PROCESS MODEL Every manufacturing process consists of what is called I-T-O, or Input-Transformation-Output. Using this concept, we can separate the components of the folding carton manufacturing process into basic segments (Figure 1). In discussing the importance of surface coating performance, however, the process doesn't stop there. Indeed, the output, or end result of the folding carton manufacturing process will be- come an input to another process---that carried out by the end user. This may be a dry foods producer, a powdered soap manu- facturer, a beverage line, or any of a number of high-volume, high-speed forming, filling, sealing and casing processes. Thus, the diagram expands (Figure 2). As one of many possible examples, consider a folding carton, designed and manufactured for retail beverage distribution. In the printing and converting process, the transformation of sev- eral inputs (paperboard, inks and coatings, plates/cylinders, films, adhesives) produces folding cartons. These then become inputs to the beverage operation as they are formed, filled, sealed, cased TECHNOLOGIES & TECHNIQUES BEGINNER FLEXOGRAPHER Folding Carton Surface Performance Making a Problematical Prediction Printing Cutting Gluing Ink Coating Inking System Components Press Configuration Substrate Carton Flats Inputs Transformation Outputs FIGURE 1. Filling Line Filled Cartons Inputs Transformation Outputs Carton Flats FIGURE 2.