Recyclable Barrier Coating Replaces Polyethylene for Ream Wrapping Paper

GoalProvide a recyclable barrier solution to replace polyethylene (PE).

<h6>Customer Challenge</h6> <p>A European producer of office paper and professional printing papers required a more sustainable, recyclable barrier solution to replace polyethylene (PE) for a ream wrapping paper application. The desired solution was to eliminate the PE extrusion converting operation and utilize the existing off-line coaters.</p> <h6>Process:</h6> <ul> <li>90 g/m&sup2; copy paper is used as base paper for coating</li> <li>15-20 &mu;m PE applied on extrusion line to protect the packed paper sheets from the effects of moisture during storage</li> <li>Target MVTR of 12 g/m&sup2;/24h at 25&deg;C/75% Relative Humidity</li> <li>Off-line coater with air knife available</li> </ul> <h6>Recommended solution</h6> <p>TopScreen&trade; DS3V (15 g/m&sup2; in one coating layer) was selected to achieve targeted MVTR barrier properties. The product was diluted before application to achieve desired barrier coating application of 15 g/m&sup2; for the air knife coater to be used.</p> <h6>Results Achieved</h6> <ul> <li>MVTR of 11 g/m&sup2;/24h at 25&deg;C/75% relative humidity was achieved with 15 g/m&sup2; coating weight</li> <li>Repulpable</li> <li>Printable</li> <li>Good hot melt glueability</li> <li>High sustainable content of the coating (65%)</li> <li>10% higher barrier cost compared to 15-20 &mu;m PE</li> </ul>